Gestra Products Technical - Control And Power

GESTRA 

Technical Information 

Steam Traps and Valves for Energy Industries · Electronic Controls · Automation 

Special Equipment and Vessels for Heat Recovery 

2009

Contents 

Steam Traps and 

Valves 

Industrial Electronics 

– System solutions – 

Special Equipment 

and Vessels 

for Heat Recovery 

GESTRA Academy 

Steam Traps and 

Trap Testing Equipment 

Condensate header and steam manifold 

Gravity Circulation Checks 

Screwed Non-Return Valves 

DISCO Non-Return Valves 

Return Temperature Control Valves 

Self-Acting Pressure and Temperature Controllers 

Control Valves 

General 

Level 

Temperature, conductivity, 

Continuous and intermittent boiler blowdown 

Oil and turbidity monitoring, steam flow metering 

Condensate Recovery and 

Vessels for Heat Recovery 

Desuperheating Plants 

Feedwater Deaerating Plants 

Mixing Cooler (Blowdown Receiver) 

Training Seminars 

Useful Information/Conversions 

Information ATEX Directive 94/9EC 

Information on Pressure Equipment Directive 

DISCOCHECK Dual-Plate Check Valves 

DISCO Swing Check Valves 

Safety Valves 

Strainers 

Stop Valves 

Basics, type code 

Schematic layout of steam boiler 

Type approvals at a glance 

Bus system, compact, conventional 

Bus, compact 

Conventional 

Conventional 

Condensate Dampening Pots 

Steam Driers and Purifiers 

Plate-Type Heat Exchangers 

Vessels 

Materials Guide 

Steam Tables 

Design of GESTRA Valves 

Index by Product Name and Code at Back of 

Technical Information

GESTRA Steam Traps 

and Steam Trap Monitoring Equipment 

Page 

Steam Trap Selection ......................................................................................................................... 5 

Thermostatic Steam Trap BK with Duo S.S. (Bimetallic) Regulator ............................................... 6 – 7 

Thermostatic Steam Trap MK with Membrane Regulator ............................................................. 8 – 9 

Ball Float Trap UNA, UNA Special ........................................................................................... 10 – 14 

Stainless Steel Traps MK, SMK, UNA .................................................................... see MK, SMK, UNA 

Thermodynamic Steam Trap DK ...............................................................................................15 – 16 

Steam Traps for Special Applications 

Condensate Drain Valves AK ............................................................................................ 17 – 19 

Steam Trap with Adjustable Discharge Temperature UBK ................................................. 17 – 19 

Steam Trap for SIP Applications SMK ............................................................................... 17 – 19 

Steam Trap for Low-Pressure Steam Heating Plants MK .................................................. 17 – 20 

Steam Traps for Large Condensate Flowrates TK, GK ...................................................... 17 – 20 

Steam Traps for Air-Venting BK, MK ................................................................................. see BK, MK 

Steam Trap Units ECONOline for UNIVERSAL (Swivel) Connectors .................................................. 21 

Compressed-Air Draining Condensate 

Ball-Float Traps for Draining Condensate from Compressed-Air 

and Other Gas Lines UNA .......................................................................................................... 22 

Why Testing Steam Traps ................................................................................................................. 23 

Steam Trap Monitoring Equipment VK, VKE, VKP .................................................................... 24 – 25 

Condensate Collector V 21.9/K, Steam Manifold V 21.9 .................................................................. 26 

Condensate Collector V 20.8/K, Steam Manifold V 20.8 .................................................................. 27 

A1

GESTRA Steam Traps 

GESTRA Steam Traps Type BK 

This is a very robust range of traps with stainless steel 

bimetallic plates and unaffected by waterhammer and frost. 

The trap is ideal for arduous duties and designed for 

pressure differences of up to 250 bar.

For steam and energy management, 

we are right on target 

Steam Trap Selection 

Not all steam trap types are equally suitable for a given application. 

Depending on the operating conditions and service in question, one or 

more systems will be particularly well suited. 

Ratings: 

1 = Excellent 

2 = Good 

3 = Fair or conditional 

– = Not recommended, unsuitable 

Trap type BK with 

bimetallic regulator 

Technical information on steam trapping and trap selection 

The following table contains 15 criteria for steam trap 

selection based on the operation of the plant and the specific 

requirements on the part of the plant owner. 

Trap type MK with 

membrane regulator 

Steam trap types 

Criteria Please note: 

Ball float trap type UNA 

with Duplex control 

1. Operation with Condensate from steam 1 1 1 1 

different Condensate from compressed air – – – 1 

condensates Condensate, distillate from 

– – – 1 

chemical products 

2. Different modes Continuous operation: 

of operation Constant formation of condensate; 2 1 1 1 

flowrate and pressure vary 

Discontinuous operation: 

Ball float trap type UNA 

with Simplex control 

For “cold” condensates or condensates with a saturation 

curve deviating from that of water only float traps featuring 

Simplex control 

(without thermal venting) can be used. 

Intermittent formation of condensate; 

flowrate and pressure vary strongly 

2 1 1 3*) *) e. g. air venting difficulties 

Any operation: Heat exchanger may 

be controlled on the steam side 3**) 2 1 3*) 

*) Air venting difficulties, **) With partial load (reduced 

differential pressure) flowrate possibly not sufficient 

3. Operation with Up to approx. 30 % of upstream pressure 1 1 1 1 

back pressure From 30 % to 60 % of upstream pressure 3*) 1 1 1 *) Possibly readjustment required 

> 60 % of upstream pressure 3*) 1 1 1 *) Possibly readjustment required 

4. Sensitivity to dirt Highly contaminated condensate 1 1 1 1 

5. Air-venting Automatic 1 1 1 3*) *) Manual air-venting 

6. Condensate Condensate temperature nearly 

discharge at boiling temperature 

definite 

temperatures 

2*) 2**) 1 1 

This may apply to small heat exchangers 

(e. g. laboratory equipment) 

*) Possibly readjustment required 

**) Might require special membrane regulator 

Condensate undercooling 

approx. 30 K (required) 

1*) 1**) – – 

*) with U-type regulator or by readjustment 

**) with U-type capsule 

Condensate undercooling *) By a corresponding readjustment reduction 

adjustable 2*) – – – in flowrate; if possible use steam trap with 

adjustable discharge temperature UBK 

7. Frost resistance 1 1 1*) 3*) *) Only ensured with V-type design 

8. Condensate Intermittent condensate formation 1 1 1 1 

discharge without Reduced condensate formation (< 10 kg/h) 1 1 1 1 

loss of live steam Continuous condensate formation (> 10 kg/h) 1 1 1 1 

9. Resistance to waterhammer 1 1*) 3*) 3*) *) Built-in non-return valve = 1 

10. Non-return valve action 1 1*) –*) –*) *) Built-in non-return valve = 1 

11. Application in vacuum 3 2 1 1 

12. Installation in any position 1 1 –*) –*) *) UNA 1... can be converted 

13. Ease of maintenance 1 1 1 1 

14. Service life of control unit 1 2 1 1 

15. Application with superheated steam 1 3 3*) 1 *) UNA 1.. like MK, UNA 2.. not recommended 

Title of publication GESTRA Information # / Medium 

Steam trap selection program CD-ROM 

Condensate manual: Basic principles of steam trapping, sizing of steam and condensate return lines, 

selection and application of steam traps etc. 

Paperback 

Physical basis for evaluating steam-trap performance A 1.1 

Automatic drainage of steam and condensate systems during start-up and shut-down A 1.2 

Waterhammer and how to avoid it A 1.3 

How to avoid operating trouble A 1.5 

Ball-float traps for draining compressed-air plants A 1.6 

Automatic deaeration of steam-heated heat exchangers A 1.7 

Drainage of rotary cylinders A 1.8 

Utilization of sensible heat of condensate C 1.2 

A1

Thermostatic Steam Traps BK with Duo Stainless Steel 

(Bimetallic) Regulator PN 0 – PN 0 

BK 45, BK 46 

DN 15, 20, 25 

L 

L 

BK 15, DN 40, 50 

Features of the BK series 

• Robust regulator for roughest operating 

conditions (unaffected by waterhammer and frost) 

• Suitable for superheated steam 

applications 

• Automatic air-venting 

(steam trap can be used for thermal 

air-venting in steam systems) 

• Installation in any position 

(horizontal and vertical lines) 

• Stage nozzle acts as non-return valve 

• Stainless steel internals 

Application 

For open-loop controlled heating processes. 

Draining of 

– saturated steam lines 

– superheated steam lines 

– steam tracers 

Can also be used for thermal air-venting 

Air-venting 

Pressure/Temperature Ratings * ) 

Type 

PN 

Class 

∆ PMX 

[bar] 

• Repairable in-line 

• Base bushing ensures positive metal-to-metal 

sealing between body and regulator. 

• Up to ∆p 250 bar g 

• Optional extra: Integrated steam trap monitoring 

for BK 45 (temperature or steam loss) 

Steam trap for thermostatic air-venting with bimetallic regulator 

The thermostatic steam traps with corrosion-resistant Duo S.S. (bimetallic) regulator of the BK series can also be 

used for air-venting. 

Application 

Thermostatic steam trap for automatic air-venting and discharge of non-condensable gases and 

steam/air mixtures from steam lines and heat exchangers. 

Special adjustment might be required. 

Material Max. Pressure / Temp. Rating 

EN ASTM PMA/ TMA PMA / TMA 

BK 45 1) PN 40 22 P250GH 2) A105 2) 28.4 bar / 250 °C 23.1 bar / 400 °C 

BK 15 DN 40 / 50 PN 40 22 P250GH 2) A105 2) 28.4 bar / 250 °C 23.1 bar / 400 °C 

BK 46 5) PN 40 32 1.5415 A182 F1 3) 30.2 bar / 300 °C 25.8 bar / 450 °C 

BK 37 PN 63/100 45 1.5415 A182 F1 3 ) 100.0 bar / 350 °C 34.3 bar / 530 °C 

BK 27N DN 40/50 PN 63 45 1.5415 A182 F1 3) 47.6 bar / 300 °C 25.8 bar / 500 °C 

BK 28 PN 100 85 1.5415 A182 F1 3) 100.0 bar / 350 °C 34.3 bar / 530 °C 

BK 29 PN 160 110 1.7335 A182 F12 146.1 bar / 350 °C 44.5 bar / 540 °C 

BK 212 PN 630 250 1.7383 A182 F22 2 ) 447.5 bar / 500 °C 4 ) 163.0 bar / 580 °C 4 ) 

BK 212-F91 – 250 1.4903 A182 F91 932.9 bar / 500 °C 348.4 bar / 600 °C 

BK 37-ASME Class 400/600 45 – A182 F12 67.0 bar / 450 °C 42.0 bar / 500 °C 

BK 28-ASME Class 600 85 – A182 F12 80.4 bar / 350 °C 50.6 bar / 500 °C 



1 ) Also available: BK 45 U (discharges condensate with approx. 30 K undercooling). 

2 ) Material complies with EN and ASTM requirements. 

3 ) Physical and chemical properties comply with EN grade. 

ASTM nearest equivalent grade is stated for guidance only. 

4) With special nuts and bolts. 

5) BK 46 replaces BK 16. 

* ) For more information on pressure/temperature ratings and end connections see data sheet.

Thermostatic Steam Traps BK with Duo Stainless Steel 

(Bimetallic) Regulator PN 0 – PN 0 

Capacity Charts 

L 

BK 27N, DN 40, 50 

L 

BK 37, BK 28, BK 29, DN 15, 20, 25 

BK 212, DN 15, 20, 25 

L 

The charts show the maximum hot condensate capacities. 

BK 45 DN 15-25 ∆pmax 22 bar (Curve 1) 


BK 15 DN 40 und 50 ∆pmax 22 bar (Curve 2) 

Available End Connections and Overall Lengths in mm 

Type Connection DN 15 [ 1/2"] DN 20 [ 3/4"] DN 25 [1"] DN 40 [1 1/2"] DN 50 [2"] 

BK 45 Flanged EN PN 40 150 150 160 230 230 

Flanged ASME 150 1 ) 150 150 160 230 230 

DN 15 – 25 Flanged ASME 300 1) 150 150 160 230 230 

BK 15 Screwed sockets 95 95 95 130 230 

DN 40, 50 Socket-weld (SW) 95 95 95 130 230 

Butt-weld (BW) 200 200 200 250 250 

BK 46 Flanged EN PN 40 150 150 160 – – 

Flanged ASME 300 150 150 160 – – 

Screwed sockets 95 95 95 – – 

Socket-weld (SW) 95 95 95 – – 

BK 27N Flanged EN PN 40 – – – 230 230 

DN 40,50 Flanged EN PN 63 – – – 260 300 

Flanged ASME 400/600 – – – 241 292 

Socket-weld (SW) – – – 180 180 

Butt-weld (BW) – – – 180 180 

BK 37 Flanged EN PN 63/100 210 230 230 – – 

BK 28 Socket-weld (SW) 160 160 160 – – 

Butt-weld (BW) 160 160 160 – – 

BK 29 Flanged EN PN 160 210 230 230 – – 

Socket-weld (SW) 160 160 160 – – 

Butt-weld (BW) 160 160 160 – – 

BK 212 Butt-weld (BW) 330 330 330 – – 

Socket-weld (SW) 330 330 330 – – 

BK 212-F91 Butt-weld (BW) 330 330 330 – – 

BK 37-ASME Flanged ASME 400/600 230 230 230 – – 

Socket-weld (SW) 160 160 160 – – 

Butt-weld (BW) 160 160 160 – 


Socket-weld (SW) 160 160 160 – – 

Butt-weld (BW) 160 160 160 – – 


Socket-weld (SW) 200 200 200 – – 

Butt-weld (BW) 200 200 200 – – 

BK 212-ASME Socket-weld (SW) 330 330 330 – – 

Butt-weld (BW) 330 330 330 – – 

1 ) BK 45 with ASME flanges: overall length 172 mm available on request. 

BK 27N DN 40 und 50 ∆pmax 45 bar (Curve 1) 


BK 28/BK 28 ASME ∆pmax 85 bar (Curve 2) 



4 

A1

Thermostatic Steam Traps MK 

with Membrane Regulator PN 2 – PN 0 

MK 45-1 

DN 15, 20, 25 

L 

L 

MK 35/31, DN 10, 15 

L 

MK 35/2 S, DN 25 

L 

MK 35/2 S3, DN 25 

Features of the MK series 

• Very sensitive response characteristic 

• Function is not impaired by 

high back pressure 

• Automatic air-venting (trap can be used 

for thermal air-venting in steam systems) 


(horizontal and vertical lines) 

• High hot-water capacities even with low 

differential pressures 

Application 

Type 

MK 45-1 

MK 35/31 1) 

MK 45-2 

MK 35/32 1 ) 

MK 25/2 1) 

MK 25/2 S 1) 

MK 35/2 S 1 ) 

MK 35/2 S3 1 ) 

MK 36/51 1) 

MK 36/52 1) 

MK 45 A-1 

MK 45 A-2 

With tandem seat (double sealing) 

For low condensate flowrates, steam-tracing, steam-line drainage, 

air-venting 

With single seat 

For medium condensate flowrates, steam-tracing, drainage of heat exchangers, 

air-venting 

With single seat 

For large condensate flowrates, 

drainage of heat exchangers 

1) Can also be used for vacuum breaking (aerating). 

Air Venting 

STAiNLESS 

STEEL 

STAiNLESS 

STEEL 

Pressure/Temperature Ratings *) 

With tandem seat (double sealing) – with flat gasket 

For small/large condensate flowrates, steam tracing, steam-line drainage, 

venting and vacuum-breaking. Also suitable for food, biological and 

pharmaceutical applications. 

For small and large condensate flowrates; steam-tracing, 

steam-line drainage, air-venting 

• With tandem seat (double sealing) 

for low condensate flowrates 

• Built-in non-return valve 

• Stainless steel internals (corrugated membrane 

of Hastelloy) 

• Design “U” with undercooling capsule: 

utilization of a certain amount of sensible heat 

by banking-up of condensate, decreasing the 

amount of flash steam 

• Optional extra: Integrated condensate monitoring 

for MK 45 (temperature or steam loss) 

Steam Trap for Thermostatic Air-Venting with Membrane Regulator 

The thermostatic steam traps with membrane regulators of the MK series can also be used 

for air-venting. 

Application 

Thermostatic steam trap for automatic air-venting and discharge of non-condensable 

gases and steam/air mixtures from steam lines and heat exchangers. 

A special type of membrane might be required. 

Type 

PN ∆ PMX Material 

[bar] EN ASTM 

Max. Pressure/Temp. Rating 

PMA / TMA PMA / TMA 

MK 35/31 PN 25 21 P250GH1) A 1051) 18.6 bar / 225 °C 14.4 bar / 400 °C 

MK 35/32 PN 25 21 P250GH1) A 1051) 18.6 bar / 225 °C 14.4 bar / 400 °C 

MK 45-1 PN 40 22 P250GH1) A 1051) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 45-2 PN 40 22 P250GH1) A 1051) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 35/2 S DN 25 PN 40 22 P250GH A 105 3) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 35/2 S3 DN 25 PN 40 22 P250GH A 105 3) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 25/2 DN 40/50 PN 40 22 P250GH A 105 3 ) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 25/2 S DN 40/50 PN 40 22 P250GH2 ) A 105 2 ) 3 ) 28.4 bar / 250 °C 23.1 bar / 400 °C 

MK 36/51, MK 36/52 – 32 1.4301 4 ) A 182 F304 32 bar / 240 °C 32 bar / 240 °C 

MK 45 A-1 PN 40 22 1.44041 ) A 182 F316 L1 ) 29.3 bar / 200 °C 24 bar / 400 °C 

MK 45 A-2 PN 40 22 1.44041 ) A 182 F316 L1 ) 29.3 bar / 200 °C 24 bar / 400 °C 

1) Material complies with EN and ASTM requirements. 

2) MK 25/2 S DN 40/50: cover made of cast steel GS-C 25 

(ASTM nearest equivalent: A 216 Gr. WCB) 

3) Physical and chemical properties comply with EN grade. 

ASTM nearest equivalent grade is stated for guidance only. 

4 ) EN nearest equivalent grade is stated for guidance only. 

* ) For more information on pressure/temperature ratings and end connections see data sheet. 

STAiNLESS 

STEEL

Thermostatic Steam Traps MK 

with Membrane Regulator PN 2 – PN 0 


L 

MK 25/2 , DN 40, 50 


MK 45-1 (Curve 1) 

MK 45-2 (Curve 2) 

MK 36/51 (Curve 3) 

L 

MK 25/2 S, DN 40, 50 

L 

MK 36/51, DN 8, 10, 15, 20 mm 

Connection: screwed socket 

MK 35/31 (Curve 1) 

MK 35/32 (Curve 2) 

MK 36/52 (Curve 2) 

Available End Connections and Overall Length 

Type Connection 

L 

DN 8 

1 /4" 

DN 10 

3 /8" 

Overall length (L) in mm 

DN 15 

1 /2" 

DN 20 

3 /4" 

DN 25 

1" 

DN 40 

1 1 /2" 

MK 45-1 Flanged DIN PN 40 – – 150 150 160 – – 

MK 45-2 Flanged ASME 150 1) – – 150 150 160 – – 

MK 45 A-1 Flanged ASME 300 1 ) – – 150 150 160 – – 

MK 45 A-2 Screwed sockets – – 95 95 95 – – 

MK 35/2 S3 only DN 25 Socket-weld (SW) – – 95 95 95 – – 

MK 35/2 S only DN 25 Butt-weld (BW) 2 ) – – 200 200 200 – – 

MK 35/31 

Screwed sockets – 70 70 – – – – 

MK 35/32 

Socket-weld (SW) – – 95 – – – – 

MK 25/2 DN 40 – 50 

MK 25/2 S DN 40 – 50 

DN 50 

2" 

Flanged DIN PN 40 – – – – – 230 230 

Flanged ASME 150 – – – – – 230 230 

Flanged ASME 300 – – – – – 230 230 

Screwed sockets – – – – – 130 230 

Socket-weld (SW) – – – – – 130 230 

MK 36/51 Screwed sockets 65 65 65 65 – – – 

MK 36/52 Union butt-weld 

nipples 3) 

– – 150 – – – – 

Hinged clamp – 65 65 65 65 – – 

1) MK 45 with ASME 

flanges: overall 

length 172 mm 

available on 

request. 

MK 36/51, DN 15 mm 

Design with union 

butt-weld nipples 

STAiNLESS 

STEEL 

STAiNLESS 

STEEL 

L 

MK 36/51, DN 8, 10, 15, 20 mm 

Connection: 

hinged clamp 

MK 25/2 S, DN 40, 50 (Curve 1) 

MK 25/2, DN 40, 50 (Curve 2) 

2 ) Only MK 45 

3 ) Made of carbon 

steel or stainless 

steel 

MK 35/2 S3, DN 25 (Curve 3) 

MK 35/2S, DN 25 (Curve 4) 

A1

Ball-Float Traps UNA 

PN 1 – PN 1 0 

L 

L 2 

10 

UNA 23/25/26 h 

DN 15 – 50 

UNA 23/25/26 v 

DN 40, 50 with MAX regulator 

L 1 

UNA 14/16 v 

DN 15 – 25 

L 

UNA 27 h 

DN 25 – 50 

UNA 39 

DN 15, 25, 50 

Features of the UNA series 

• Unaffected by back pressure and condensate 

temperature 

• No loss of live steam due to continuous 

water seal at the seat 

• No banking-up of condensate even with 

extreme load and pressure fluctuations 

• Particularly well suited for heat exchangers 

controlled from the steam side 

• Unaffected by dirt 

• Automatic thermostatic air-venting 

(Duplex design) 

Application 

Condensate discharge without banking-up, 

even at varying operating conditions and back 

pressure. Automatic air-venting (Duplex design). 

Also for the discharge of cold condensates and 

distillates, and for draining gas and compressed 

air systems (Simplex design). 

Pressure/Temperature Ratings and Designs **) 

Type PN 

∆PMX 

[bar] 

Werkstoffe Druck-/Temperaturgrenzen 

EN ASTM 1 ) PMA / TMA PMA / TMA 

UNA 14 25 13 EN-JS 1049 – 25 bar / 20 °C 15 bar / 350 °C 

UNA 23 16 13 EN-JL 1040 A126 Cl. B 16 bar / 120 °C 9.6 bar / 300 °C 

UNA 16 40 22 

1.0460; 

1.0619 

A105; 

A216 WCB 

40 bar / 20 °C 23.1 bar / 400 °C 

UNA 25 40 32 EN-JS 1049 – 32 bar / 250 °C 25 bar / 350 °C 

UNA 26 40 32 

1.0460; 

1.0619 

A105; 

A216 WCB 

32 bar / 250 °C 3 ) 21 bar / 400 °C 

UNA 27 h 63 45 1.5419 A217 WC1 56 bar / 250 °C 40.6 bar / 450 °C 

UNA 38 100 80 1.5415 4 ) A182-F1 100 bar / 150 °C 44 bar / 500 °C 

UNA 39 160 140 1.7335 A182 F12 160 bar / 300 °C 35 bar / 550 °C 

UNA-Special 

Typ 62 

16 16 EN-JL 1040 A126 Cl. B 16 bar / 120 °C 9.6 bar / 300 °C 

UNA-Special 25 22 1.0619 A216 WCB 22.6 bar / 120 °C 14.4 bar / 400 °C 

UNA 25 22 1.0619 A216 WCB 22.6 bar / 120 °C 14.4 bar / 400 °C 

UNA-Special 63 45 1.5419 A217 WC1 56 bar / 250 °C 40.6 bar / 450 °C 

UNA 16 A 

STAiNLESS 

STEEL 

UNA 26 h 

STAiNLESS 

STEEL 

40 22 

1.4404 2) 

1.4308 2 ) 

A182 F 316L 2) 

A351 CF8 2 ) 

40 bar / 

–196 °C / 20 °C 

25.8 bar / 300 °C 

40 32 1.4408 A351 CF8 M 40 bar / 20 °C 25.8 bar / 300 °C 

1 ) ASTM nearest equivalent grade is stated for guidance only. 

Physical and chemical properties comply with EN grade. 

2 ) Body/cover material 

3 ) UNA 26 DN 40, DN 50: 26 bar/250 °C 

4) Body 1.5415, cover 1.7357 

**) For more information on pressure/temperature ratings and end connections see data sheet. 

h: for horizontal lines 

• Ideal for discharging cold condensates, distillates 

and condensates derived from chemical 

products (Simplex design) 

• Repairable in-line 

• Thanks to the rolling ball valve only reduced 

operating forces and small control units are 

required (compact, lightweight design for 

large flowrates) 

• Internals made from corrosion-resistant 

stainless steels


PN 1 – PN 1 0 

L1 

UNA-Special Typ 62, PN 16 

UNA-Special, PN 25 

UNA-Special, PN 63 

UNA PN 25 

L1 

L 2 

L 2 

Optional items for Ball-Float Traps 




Length L1/L2 in mm 

DN 50 DN 65 DN 80 DN 100 

2" 2 

Simplex: Float control (without thermostatic bellows) 

Duplex: 

Simplex-R: 

Flow control + automatic air-venting 

Float control + inner vent pipe 

1/2" 3" 4" 

UNA-Special Flanged EN PN 16 L1 – 470 490 700 

Typ 62, PN 16 L2 – 395 420 595 

UNA-Special Flanged EN PN 25 L1 445 470 – – 

PN 25 L2 345 395 – – 

UNA PN 25 Flanged EN PN 25 L1 – – 140 140 

L2 – – 335 400 

UNA 38h 

UNA-Special 

PN 63 

Flanged EN PN 63 L1 

L2 

– 

– 

565 

400 

690 

435 

700 

450 

Available Designs 

Type 

End connection options 

horizontal vertical angle pattern 

Orifice (AO) for max. differential pressure 

Simplex 

Control unit 

Duplex Simplex-R 

UNA 14 x1 ) x1 ) AO 4, 13 x x x 

UNA 16, 16A x1) x1) AO 4, 13, 22 x x x 

UNA 23 x x 

AO 2, 4, 8, 13, 4 max.*), 8 max.*), 13 max.*), 

22 max.*), 32 max.*) 

x x x 

UNA 25/26 x x 

AO 2, 4, 8, 13, 22, 32, 4 max.*), 8 max.*), 13 max.*) 

22 max.*), 32 max.*) 

x x x 

UNA 27h x AO 16, 28, 45 x x 

UNA 38 x1 ) x1 ) AO 50, (64), 80, 80 max. x x 

UNA 39 x AO 80, 110, 140, 140 max. x 

UNA-Special Typ 62, PN 16 x AO 22) 3), 3.54), 5, 10, 16 x6) x2) 7) 

UNA-Special PN 25 x AO 25 ), 3.54 ), 5, 10, 16, 22 x6 ) x7 ) 

UNA PN 25 x AO 2, 3.5, 5, 8, 12, 16, 22 x6 ) 

UNA-Special PN 63 x AO 16, 22, 32, 40, 45 x6) 1 ) A conversion of “h” to “v” or vice versa is possible 

2 ) This design is not available for DN 100 mm 

3) This design is not available for DN 80 mm 


item Type 

Sightglass cover UNA 23 

Float lifting lever with gasket UNA 23, 25, 26 (UNA 27 h and 38 on request) 

Vent valve with gasket (for Duplex design) UNA 23, 25, 26, 27 h, 38 


DN 15 DN 20 DN 25 DN 40 DN 50 

1 /2" 3 /4" 1" 1 1 /2" 2" 

UNA 14h, 14v Flanged EN PN 25 150 150 160 – – 


UNA 16h, 16v, Flanged EN PN 40 150 150 160 – – 

UNA 16Ah, 16Av Flanged ASME 150 RF 150 150 160 – – 

STAiNLESS 

STEEL 


Socket-weld (SW) 95 95 95 – – 

Butt-weld (BW) 200 200 200 – – 

UNA 23h, 23v Flanged EN PN 16 150 150 160 230 230 



UNA 26h Flanged EN PN 40 210 210 230 320 320 

STAiNLESS STEEL 

UNA 26h Flanged ASME 150 + 300 RF 210 210 230 320 320 

Screwed sockets 200 200 200 255 255 

Socket-weld (SW) 200 200 200 230 230 

Butt-weld (BW) 200 200 200 230 230 

UNA 27h 1 ) Flanged EN PN 63/PN 100 300 – 300 420 416 

and Flanged ASME 600 RF 300 – 300 421 427 

UNA 38 Socket-weld / SW via transition pieces 300 – 300 420 2) 420 2) 

Butt-weld / BW via transition pieces 300 – 300 420 2 ) 420 2 ) 

UNA 39 L1/L2 L1/L2 L1/L2 

Flanged EN PN 160 215/285 – 230/300 – 245/315 

Flanged ASME 900 RF 250/320 – 260/330 – 280/350 

Butt-weld (BW) 170/240 – 170/240 – 170/240 

1) not available as DN 15 2) UNA 38 socket-weld (SW) ends and butt-weld (BW) ends DN 40 + DN 50: 300 mm, 

SW and BW via transition pieces: 420 mm 


6 ) Simplex: Flow control + hand vent valve + float lifting lever 

7) Duplex: Flow control + automatic air-venting 

*) DN 40, DN 50 

11 

A1


PN 1 – PN 1 0 


The charts show the maximum hot condensate capacities for the range of float-controlled orifices (AO) and sizes available. 

UNA 14, UNA 16 UNA 23, UNA 25, UNA 26 

12 

UNA 27 h 

UNA 38, Orifice 50, 64, 80 

Capacity 

, AO 22 

Durchfluss Capacity 

UNA 23, 25, 26 max. 

[lb/h] 

80000 

60000 

50000 

40000 

30000 

20000 

10000 

8000 

6000 

5000 

4000 

[kg/h] 

35000 

30000 

20000 

15000 

10000 

8000 

7000 

6000 

5000 

4000 

3000 

2000 

[bar] 

0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 7 8 10 13 

[psi] 

1,45 2 3 4 5 6 8 10 20 30 40 50 60 80 100 200 

∆ PMX 

UNA 38, Orifice 80 max. 

Capacity 

DN 40-50 - AO4 MAX 

DN 40-50 - AO13 MAX 

DN 40-50 - AO8 MAX 

* Traps with small end connection sizes do not 

reach the flowrates indicated in this chart. 

DN 50 - AO80 MAX*


PN 1 – PN 


The charts show the maximum hot condensate capacities for the range of orifices (AO) and sizes available. 

UNA 39, DN 15, 25 and 50 

UNA-Special Type 62, PN 16 

UNA PN 25, DN 80 and 100 

DN 50 - 

AO 80 

AO 110 

AO 140 

AO 140 MAX* 

10 

* Traps with small end connection sizes do not 

reach the flowrates indicated in this chart. 

Available 

orifices (AO) 

1 DN 65 AO 16 

2 DN 65 AO 10 

DN 80 AO 16 

3 DN 80 AO 10 

4 DN 100 AO 16 

5 DN 65 AO 5 

6 DN 80 AO 5 

7 DN 65 AO 2 

DN 80 AO 3.5 

DN 100 AO 10 

8 DN 100 AO 5 

9 DN 100 AO 3.5 

10 DN 100 AO 2 

Available 

orifices (AO) 

1 DN 80 AO 22 

2 DN 80 AO 16 

DN 100 AO 22 

3 DN 80 AO 12 

4 DN 100 AO 16 

5 DN 80 AO 8 

DN 100 AO 12 

6 DN 80 AO 5 

DN 100 AO 8 

7 DN 80 AO 3.5 

8 DN 100 AO 5 

9 DN 80 AO 2 

DN 100 AO 3.5 

10 DN 100 AO 2 

1 

A1

Ball-Float Traps UNA and UNA-Special 

PN 1 – PN 


The charts show the maximum hot condensate capacities for the range of orifices (AO) and sizes available. 

UNA-Special PN 25, DN 50 and 65 

UNA-Special PN 63 (PN 40) 

1 

Available 

orifices (AO) 

1 DN 50 AO 22 

2 DN 50 AO 16 

DN 65 AO 22 

3 DN 50 AO 10 

DN 65 AO 16 

4 DN 65 AO 10 

5 DN 50 AO 5 

6 DN 50 AO 3.5 

DN 65 AO 5 

7 DN 65 AO 2 

Available 

orifices (AO) 

1 DN 65 AO 45 

2 DN 65 AO 40 

3 DN 80 AO 45 

4 DN 65 AO 32 

DN 80 AO 40 

5 DN 100 AO 45 

6 DN 65 AO 22 

DN 100 AO 40 

7 DN 80 AO 32 

8 DN 65 AO 16 

9 DN 100 AO 32 

10 DN 80 AO 22 

11 DN 80 AO 16 

DN 100 AO 22 

12 DN 100 AO 16

Thermodynamic Steam Traps DK 

PN 0, PN /Class 00 

L 

DK 45 

L 

DK 47 

L 

DK 57 

Features of the DK series 

• Discharge with virtually no banking-up 

• Robust, insensitive regulator 


• Max. admissible back pressure 80 % of the upstream pressure 

Application 

Type 

DK 45 Rhombusline body 

with enclosed, weather-resistant regulator for discharging steam lines and tracing 

systems without banking-up of condensate 

DK 47-L Compact steam trap 

DK 57-L for small condensate flowrates for discharging steam lines and tracing systems 

without banking-up of condensate 

DK 47-H Compact steam trap 

DK 57-H for large condensate flowrates for discharging steam lines and tracing systems 

without banking-up of condensate 


PN ∆ PMX Material Pressure/Temp. Rating 

Type Class [bar] EN ASTM PMA / TMA PMA / TMA 

DK 45 PN 40 32 1.0460 1) A 105 1) 28.4 bar / 250 °C 23.1 bar / 400 °C 

DK 47 PN 63 / Class 600 42 1.4027 2) A 743CA40 63 bar / 120 °C 42 bar / 400 °C 

DK 57 PN 63/ Class 600 42 1.4021 2 ) AISI 420 63 bar / 120 °C 42 bar / 400 °C 


2) ASTM nearest equivalent grade is stated for guidance only. 


Type Connections 

DN 10 

3/8" 


DN 15 

1/2" 

DN 20 

3/4" 

DN 25 

1" 

DK 45 Flanged EN PN 40 – 150 150 160 

Flanged ASME 1501 ) – 150 150 160 

Flanged ASME 3001) – 150 150 160 

Screwed sockets – 95 95 95 

Socket-weld (SW) – 95 95 95 

Butt-weld (BW) – 200 200 200 

DK 47-L Screwed sockets 78 78 90 95 

DK 47-H Screwed sockets – 78 90 95 

DK 57-L Screwed sockets 55 65 80 – 

DK 57-H Screwed sockets – 70 80 90 

1 ) DK 45 with flanged ASME: Overall length 172 mm on request. 

1 

A1

Thermodynamic Steam Traps DK 

PN 0, PN /Class 00 



DK 45 

Capacity 

Durchsatz 

Capacity 

DK 47 DK 57 

Capacity 

1 

[lb/h] 

2000 

1000 

800 

600 

500 

400 

300 

200 

150 

[kg/h] 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

20 30 40 50 60 80 100 200 300 420 

∆PMX 

Differential pressure 

1 2 3 4 6 8 10 20 32 

[bar] 

[psi] 

Capacity 

Differential pressure

Steam Traps 

for Special Applications 

AK 45, DN 15, 20, 25 

L 

UBK 46, DN 15, 20, 25 

L 

SMK 22, DN 15 

SMK 22-51 

L 

L 

Application 

Type 

AK 45 Condensate drain valve for discharging condensate from steam systems during 

start-up and draining residual condensate at shut-down, with integral Y-type 

strainer and hand purging knob. Factory-set closing pressure 0.8 bar. 

UBK 46 Steam trap with adjustable condensate discharge temperature, 

thereby suppressing the formation of flash steam. 

With Y-type strainer. 

SMK 22, SMK 22-51 Steam trap for SIP applications. 

MK 20 Steam trap for low-pressure steam-heating installations. 

TK 23, TK 24 

GK 11 1) 

STAiNLESS 

STEEL 

1) DN 50 mm: GK 21 

Pressure/Temperature Ratings *) 

Type PN 

Steam trap with thermostatic pilot control using thermostatic capsules for the discharge 

of very large condensate flowrates with relatively continuous condensate formation. 

Thermodynamic steam trap with stage nozzle for the discharge of very large condensate 

flowrates. With integral Vaposcope (sightglass) for optimum trap adjustment. 

∆ PMX Material Max. Pressure/Temperature Rating 

[bar] EN ASTM PMA / TMA PMA / TMA 

AK 45 40 P250GH 1) A 105 1) 28.4 bar / 250 °C 23.1 bar / 400 °C 

UBK 46 40 32 P250GH1) A 1051) SMK 22 

28.4 bar / 250 °C 23.1 bar / 400 °C 

STAiNLESS 

STEEL 

10 6 1.4435 – 10 bar / 185 °C – 

SMK 22-51 10 6 1.4404 – 10 bar / 185 °C – 

MK 20 6 4,5 EN-JM 1030 – 4.5 bar / 250 °C, 3.6 bar / 300 °C, 

TK 23 16 1 – 10 EN-JL 1040 A 126 Cl.B 2 ) 16 bar / 120 °C 9.6 bar / 300 °C 

TK 24 25 1 – 14 GP240GH A 216 Gr. WCB 2) 22.6 bar / 120 °C 14.4 bar / 400 °C 

GK 11 16 3 ) 6 EN-JL 1040 A 126 Cl.B 2 ) 16 bar 3 ) / 120 °C 9.6 bar / 300 °C 




3) GK 11, DN 150 mm = PN 10 

*) For more information on pressure/temperature ratings and end connections see data sheet. 

1 

A1

Steam Traps 


1 

L 

MK 20, DN 15, 20 

L 

TK, DN 50, 65, 80, 100 

L 

GK 11, DN 65, 80, 100, 150 

GK 21, DN 50 

Available End Connections and Overall Lengths 


DN 

10 

3/8" 

DN 

15 

1/2" 

DN 

20 

3/4" 


DN 

25 

1" 

DN 

50 

2" 

DN 

65 

2 1/2" 

AK 45 Flanged EN PN 40 – 150 150 160 – – – – – 

DN 

80 

3" 

DN 

100 

4" 

Flanged ASME 150 – 150 150 160 – – – – – 

Flanged ASME 300 – 150 150 160 – – – – – 

Screwed sockets – 95 95 95 – – – – – 

UBK 46 Flanged EN PN 40 – 150 150 160 – – – – – 

SMK 22 

STAiNLESS 

STEEL 

Flanged ASME 150 – 150 150 160 – – – – – 

Flanged ASME 300 – 150 150 160 – – – – – 

Screwed sockets – 95 95 95 – – – – – 

Socket-weld (SW) – 95 95 95 – – – – – 

Butt-weld (BW) 83 83 83 83 – – – – – 

SMK 22-51 

Butt-weld (BW) 90 90 90 90 – – – – – 

MK 201) STAiNLESS 

STEEL 

Male/female thread – 120 125 – – – – – – 

TK 23 Flanged EN PN 16 – – – – 230 290 310 350 – 

TK 24 Flanged EN PN 25 – – – – 230 290 310 350 – 

GK 11 2) Flanged EN PN 16 – – – – 320 420 420 620 900 

1) Straight-through or angle design (see representation) 

2 ) DN 50 mm: GK 21 

DN 

150 

6"

Steam Traps 



The charts show the maximum hot condensate capacities. (Exception: AK 45 – cold water capacity.) 

AK 45 Cold water capacity 

UBK 46 

Service pressure (bar) 1 2 4 8 12 16 20 26 32 

Opening temperature 

at factory setting 

(°C) 72 74 78 85 89 93 97 103 109 

Capacity at ∆t 10 K below 

opening temperature 

(kg/h) 94 113 136 164 184 198 211 226 239 

Cold-condensate capacity 

at 20 °C (Start-up capacity) 

(kg/h) 267 390 570 832 1039 1215 1373 1584 1774 

SMK 22, SMK 22-51 

2000 

1000 

800 

600 

500 

400 

300 

QC [kg/h] 

QH QC [lb/h] 

[lb/h] 

[kg/h] 

1000 

800 

600 

500 

400 

300 

200 

100 

0.1 0.3 0.6 1 3 6 10 [bar] 

0.2 0.4 0.8 2 4 8 

1 2 

∆PMX 

3 4 6 8 10 20 30 40 

2 

1 

60 80 100 

[psi] 

The chart shows the maximum capacities for hot 

and cold condensate. 

Curve 1 

This curve indicates the max. capacity of hot 

condensate that the steam trap with regulating 

membrane Steriline can discharge with virtually no 

banking-up. 

Curve 2 

This curve shows the max. capacity of cold 

condensate that the steam trap can discharge 

(20 °C at start-up). 

1 

A1

Steam Traps 




MK 20 

TK 23, TK 24 

For differential pressures 

< 1 bar 

use capsule “OH2” 

(max. service pressure 

5 bar). 

GK 11, GK 21 

20

Steam Trap Units 

ECONOline 

for UNIVERSAL (Swivel) Connectors 

ECONOline 

75 / 2.9" 

75 / 2.9" 

BK 36A/7 

MK 36A/71 

DK 36A/7 

UCY 36 

UC 36 

L 

Features 

• Maintenance-free, ultra-compact steam traps made from stainless steel, suitable for all 

UNIVERSAL (Swivel) connectors 


• Integrated spiral wound gasket for connector 

• Only two screws make for a quick and easy installation 

• All steam trap units are optionally available with a UNIVERSAL connector (not fitted) 

Application 

Typ 

BK 36A/7 "Thermostatic/thermodynamic bimetallic" trap unit with corrosion-resistant 

ECONOline 

Duo S.S. regulator unaffected by waterhammer, for condensate with virtually no 

banking-up and automatic air-venting of steam lines and tracing systems. 

MK 36A/71 

MK 36A/72 

ECONOline 

DK 36A/7 

ECONOline 

UC 36 Universal connector 

Specification 

Kondensat-Durchsatz 

Condensate Capacities 

Type 

[lbs/h] 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

[kg/h] 

2500 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

PN 

Class 

30 

1 2 3 4 6 8 10 20 32 [bar] 

14,5 20 30 40 60 80 100 200 300 465 [psig] 

Differenzdruck 

Differential pressure PMX PMX 

Differential pressure PMX 

∆ PMX 

[bar] 

Material Pressure /Temperature 

EN ASTM PMA / TMA PMA / TMA 

BK 36A/7 300 32 1.4408 A 351-CF8M 49.6 bar / 20 °C 29.3 bar / 400 °C 

MK 36A/71 

MK 36A/72 

300 32 1.4408 A 351-CF8M 49.6 bar / 20 °C 29.3 bar / 400 °C 

DK 36A/7 300 32 1.4408 A 351-CF8M 49.6 bar / 20 °C 29.3 bar / 400 °C 

UC 36, UCY 36 300 - 1.4408 A 351-CF8M 49.6 bar / 20 °C 29.3 bar / 400 °C 

Available Connections and Lengths 

Type Connection Length L 

BK 36A/7; MK 36A/71; 

MK 36/A72; DK 36A/7 

UC 36, UCY 36 

"Thermostatic capsule" trap unit with corrosion-resistant membrane regulator 5N1 

unaffected by waterhammer, for condensate discharge with virtually no banking-up 

and automatic air-venting of steam lines and tracing systems. 

"Thermodynamic" trap unit for condensate discharge with virtually no banking-up. 

UCY 36 Universal connector with integrated strainer 

MK 36A/72 

DK 36A/72 

MK 36A/71 

BK 36A/7 

1 /2" 3 /4" 1" 

Universal connector 65 65 65 

Screwed sockets BSP or NPT, 

Socket-weld ends 

75 

75 

75 

75 

75 

75 

The chart shows the 

discharge capacity of hot 

condensate 

21 

A1

Ball-Float Traps for Draining Condensate from 

Compressed-Air and Other Gas Lines UNA 

L 

Specification 

Capacity Chart Hints on installation 

22 

UNA 14 Pv 

Features 

• Liquid drainer for compressed air and gases with ball float 

and rolling ball valve 

• The trap is suitable for draining gas and 

compressed air systems 

• Purging device and connection for air-balance 

pipe included as standard 

• Internals made from corrosion-resistant stainless steels 

• Closing unit for temperatures up to 40 °C 

with rolling ball made from Perbunan, up to 

120 °C with rolling ball made from stainless steel 

Type 

Design PN 

Max. differential Material 

pressure 

Max. service 

pressure 

Max. service 

temperature 

∆ PMX [bar] 2 ) EN ASTM 1 ) PMA [bar] TMA [°C] 

UNA 14 P, h + v with S.S. valve ball 25 16 EN-JS 1049 – 25 120 

(convertible) with Perbunan valve ball 25 16 EN-JS 1049 – 25 40 


2 ) inlet pressure minus outlet pressure. 

Higher pressure ratings and other materials available on request. 



DN 15 

Overall length L in mm 

DN 20 DN 25 

1/2" 3/4" 1" 

UNA 14 Ph Screwed sockets3 ) 95 95 95 

Flanged EN PN 25 150 150 160 

UNA 14 Pv Screwed sockets3) 95 95 95 

Flanged EN PN 25 150 150 160 

3) Screwed sockets BSP to EN iSO 228-1 or screwed sockets NPT 

UNA 14P 

The condensate/distillate must be free to fall towards 

the trap. Isolating valves in horizontal lines lead to the 

formation of water pockets. In this case an air-balance pipe 

is required (see drawing). 

Liquid drainer for horizontal 

installation 

Balance 

pipe 

Product line 

With or without valve; 

valve spindle horizontal 

Collecting 

pocket

Testing Steam Traps 

Like any other industrial valve steam traps are subject to wear and 

their correct functioning can be impaired by precipitated solids and dirt 

deposits. 

To assess the performance of a steam trap the following questions have 

to be answered: 

• Does the steam trap work properly? 

• If not, does the faulty trap cause loss of steam 

(leakage) or banking-up of condensate (obstructed discharge 

passage)? 

Faulty steam traps are a major source of waste in a steam distribution 

system. A trap that is blowing live steam is the worst offender, but traps 

that are plugged or stuck closed can also be costly. 

The decreased plant efficiency due to loss of energy and additional 

make-up water results in lost production. Furthermore, an increase 

of pressure is liable to arise in condensate systems which will lead to 

difficulties at all locations where condensate is discharged. 

The magnitude of such a steam loss depends on the cross-sectional 

area of the leak and, at the same time, the amount of discharged 

condensate. Locations where only small amounts of condensate are 

formed and discharged, e. g. drainage points in steam lines and tracing 

systems, are particularly problematical. On the other hand, locations 

where relatively large amounts of condensate are discharged will not 

give rise to considerable loss of live steam because of the presence of a 

large volume of liquid. 

Steam traps which are obstructed or stuck closed do not cause 

loss of energy and/or water but reduce – to a greater or lesser extent 

– the efficiency of heat-transfer equipment and steam users. And 

waterhammer caused by condensate banking-up leads to considerable 

physical damage in steam and condensate systems. 

Experience shows that installations where no regular trap testing and 

servicing takes place have a failure rate of defective steam traps in 

the order of 15 – 25 %. Regular maintenance and trap testing, which 

should be carried out at least once a year, can strongly reduce the 

failure rate to 5 %. 

Test Systems 

Steam traps can be tested during operation by using sightglasses, 

ultrasonic listening devices or level meters. 

Sightglasses (Vaposcopes Type VK 14, VK 16) provide an effective 

means of observing the flow of liquids in pipework. They are installed 

upstream of the traps, and allow the assessment of the traps by making 

their operation visible. 

Level meters use conductivity readings to monitor steam trap 

performance. A test chamber with an integral level electrode is installed 

upstream of the trap to detect any defective steam trap. The corresponding 

output signal is displayed by the Remote Test Unit NRA 1-3x 

(remote monitoring). 

The system VKE can monitor all types and makes of steam traps to 

detect loss of live steam. The correct operation of RHOMBUSline steam 

traps type BK 45/46, MK 45, UBK 46 can be verified by using the 

compact-type level probes NRG 16-19, NRG 16-27 and NRG 16-28. The 

test station NRA 1-3x will evalute the data coming from the system VKE. 

Another way to test traps is to use an ultrasonic listening device 

which detects the sound produced by steam flowing through the traps. 

Depending on the test system used the sound sensed by the device 

is either graphically represented in the form of a curve (VKP 40) or 

indicated by the deflection on the scale of a meter (VKP 10). 

When using the VKP 10, the field data specialist has to assess the 

indicator deflection and, consequently, the operation of the steam trap. 

The VKP 40, however, can directly track leaks associated with faulty 

steam traps and provides comprehensive reporting and a complete trap 

survey history. 

Annual costs caused by steam loss 

Number of steam traps installed 

Annual failure rate 

(Empirical value with first check approx. 15 – 25 %) 

A Number of defective steam traps 

B Steam loss per steam trap (kg/h) 

C Annual operating hours 

D Annual steam loss (kg) A x B x C 

= 

E Cost of steam per ton 

F Annual loss in EURO D /1000 x E = 

Example 

A Number of defective steam traps 10 

B Steam loss per steam trap 3 kg/h 

C Annual operating hours 8000 h 

D Annual steam loss 240000 kg 

E Cost of steam per ton 60 Euro/t 

F Annual loss 14,400.– Euro 

By the way: 

A new steam trap costs – depending on the end connection 

– only approx. e 150 to e 200. 

2 

A1

Steam Trap Monitoring Equipment 

2 

L 

VK 14 

L 

VK 16 

Test chamber VKE 16-1 

L 

VKE 26 with NRG 16-19 

Electrode 

connection 

either on the 

left or on the 

right side. 

NRG 16-19 NRG 16-27 NRG 16-28 

Application 

Type 

Vaposcope Sightglass with borosilicate glass for checking heat exchangers and steam traps 

VK 14, VK 16 (installation upstream of traps). Visual supervision of flow conditions in condensate lines. 

VKE Test chamber with level electrode for monitoring steam traps to detect 

loss of live steam/banking-up of condensate. Installation in horizontal lines. 

Vapophone Ultasonic detector for detecting steam leakage in steam systems; 

VKP 10 for monitoring steam traps and stop valves. 

TRAPtest Computer-based monitoring, recording and evaluation system for steam 

VKP 40/VKP 40Ex traps of all types and makes to detect loss of steam and condensate banking up. 

NRG 16-19 Level electrodes for installation in the test chamber VKE or in the body of Rhombusline 

NRG 16-27 steam traps. Designed for detecting loss of live steam/banking-up of condensate 

NRG 16-28 (used in conjunction with test unit NRA 1.3). Response sensitivity 1.0 µS/cm. 

Vaposcope VK 

The Vaposcope can be used in horizontal and vertical pipework without any modifications. 

installation upsteam of the steam trap. 

The application is limited to fluids with pH value 9 (VK 14) or 10 (VK 16). 

VK 16 comes with mica disc. 

Test Set VKE 

Consisting of: Test chamber VKE 16-1/VKE 16A with integral level electrode NRG 16-19 / NRG 16-27 

for steam traps of all types and makes. And: Test Unit NRA 1.3 for continuous remote monitoring of 

up to 16 steam traps at the same time for loss of live steam or banking-up of condensate. 


Type PN 

Material Max. Pressure/Temperature Rating 


VK 14 16 EN-JL 1040 A 126 B 1) 16 bar / 120 °C 9.6 bar / 280 °C 

VK 16 40 P 250 GH A 105 1) 40 bar / 20 °C 25.8 bar / 300 °C 

VKE 16-1 40 GP240GH 2 ) A 216 - WCB 1 ) 28.4 bar / 250 °C 3 ) 23.1 bar / 400 °C 3 ) 

VKE 16A 

40 1.4571 TP 316 Ti 1) 38 bar / 120 °C3) 32.5 bar / 250 °C 3) 

VKE 26 40 P 250 GH A 105 1 STAiNLESS 

STEEL 

) 40 bar / 20 °C 25.8 bar / 300 °C 

NRG 16-19 

NRG 16-27 

NRG 16-28 

40 1.4404 F 316L 40 bar / 20 °C 32 bar / 238 °C 

1) ASTM nearest equivalent grade is stated for guidance only. 


2 ) Forged steel flange P 250 GH (1.0460). 

3) Max. working pressure/temperature of the electrodes: 32 bar / 238°C. 

Sensitivity of electrodes NRG 16-19, NRG 16-27: 1.0 µS/cm. 


Available Connections and Overall Lengths 


DN 15 

1/2" 

Overall length L in mm 

DN 20 

3/4" 

DN 25 

1" 

DN 40 

1 1/2" 

DN 50 

2" 

VK 14 Flanged EN PN 16 130 150 160 200 230 

VK 16 Flanged EN PN 40 150 150 160 230 230 

Flanged ASME 150 150 150 160 230 230 

Flanged ASME 300 150 150 160 230 230 

Screwed sockets 95 95 95 130 210 

Socket-weld 95 95 95 130 210 

VKE 16-1 Flanged EN PN 40 150 150 160 – – 

Flanged ASME 150 150 150 160 – – 

Flanged ASME 300 150 150 160 – – 


Socket-weld 95 95 95 – – 

VKE 16 A Flanged EN PN 40 160 160 160 200 230 

VKE 26 External/internal thread 3 /8" BSP 

NRG 16-19 

External thread 3 NRG 16-27 

/8" BSP 

Nominal length = 31 mm 

with integrated Pt 1000 thermocouple 

NRG 16-28 

External thread M 24 x 1.5 for installation in the bodies of Rhombusline 

steam traps with integrated Pt 1000 thermocouple

Steam Trap Monitoring Equipment 

System VKE 

Remote monitoring Rhombusline* 

Electrode NRG 16-28 

Vapophone VKP 10 

Screened cable 

max. 100 m long 

max. 16 steam traps 

type Rhombusline, 

e.g. MK 45-1 or 

BK 45 

The VKP 10 is used to detect sound in the ultrasonic range 

as caused by steam flowing through a steam trap. 

The ultrasonic vibrations are detected by a probe and converted into 

electric signals which are indicated on the meter of a measuring 

instrument. 

Protection: iP 41 

TRAPtest VKP 40/VKP 40Ex 

Monitoring, Recording and Evaluation System for 

steam traps of all types and makes 

With the aid of the VKP 40Ex (explosion proof) – intrinsically safe version for 

hazardous locations – or the VKP 40, steam traps can be checked for loss of 

live steam and banking-up of condensate, thus evaluating their performance. 

The PC software enables: 

Recording and organising steam trap data 

Storage and evaluation of all test results 

Simple and easy steam loss calculation for failed steam traps 

Printing out repair job lists 

Features: 

Hand-held terminal with user-friendly interface for ease of operation (only 

5 keys) 

Illuminated display for showing the recorded sound emissions as curves 

(visual indication of steam losses) 

Data exchange between PC and hand-held terminal at the click of the mouse 

PC software works with windows versions from other countries 

Protection: IP 65 

VKP 40Ex approval BVS 03 ATEX E 149 

CE 0158 Ex II 2G Eex ib II C T4 

TE 

Test station NRA 1-3 

Alarm 

* Combination possible 

Remote monitoring with Universal Test Chamber* 

Electrode 

NRG 16-19 

or 

NRG 16-27 

Connecting 

cable 

Testing and 

diagnostic system 

max. 16 

test chamber 

VKE 16-1/16A 

Probe 

Measuring Charging 

4 5 

3 

6 

2 

7 

1 

9 

TEST 0 10 

8 

1 2 3 4 5 6 

Sensitivity adjustor Meter 

Screened cable 

max. 100 m long 

Test station NRA 1-3 

Alarm 

TE 

Measuring 

instrument 

Name plate Battery 

charger 

Connecting 

cable 

230 V/ 50 Hz 

2 

A1

Condensate Collector and Steam Manifold 

PN 0, DN 0, 0 

V 21. /K, V 21. 

2 

D1 

H3 

L2 

L1 

L 

M 

DN1 

DN2 

H2 

A 

H 

B C 

H1 

Description 

Compact-type condensate collector (vertical design) 

with internal immersion tube and integrated bellowssealed 

stop valves (V 21.9/K). Without immersion 

tube as steam manifold V 21.9 with integrated 

bellows-sealed stop valves. Lateral connections 

in DN 15, 20 or 25 available. Collecting tube in 

DN 40 or 50. 

Connections 

Flanged EN, PN 40 

Flanged ASME Class 150 RF 


Butt-weld ends 

Dimensions and Weights 

Number of 

lateral 

connections 

All connections 

butt-weld ends 

Butt-weld ends / flanges 

Pressure/Temperature Ratings 

Weight 

(without steam 

traps) 

Function V 21.9/K 

The condensate discharged by the steam trap flows 

downwards between immersion tube and external 

collecting tube, thereby creating a water pocket into 

which the immersion tube enters. The space between 

immersion tube and collecting tube above the water 

pocket acts as a dampening cushion consisting of 

flash steam and air bubbles. This steam cushion 

effectively prevents water hammer like a dampening 

pot. 

The condensate flowing into the unit will be forced 

into the higher condensate collecting line as a 

function of its service pressure (differential pressure). 


flanges 

Weight 

(without steam 

traps) 

A B C L approx. kg A B C L approx. kg 

4 60 160 280 150 20 107 160 374 230 31 

8 60 160 600 150 41 107 160 694 230 57 

12 60 160 920 150 62 107 160 1014 230 83 

Connections DN1 DN2 D1 H H1 H2 H3 L1 L2 M 

4 15-25 40/50 125 305 310 76 54 365 375 16 

8 15-25 40/50 125 305 310 76 54 365 375 16 

12 15-25 40/50 125 305 310 76 54 365 375 16 

PN 40 

Material P250GH (A105) 

Service pressure PMA [bar] 40.0 40.0 35.0 28.0 21.0 

inlet temperature TMA [°C] 20 100 200 300 400 

Materials 

Stop valves 

EN DIN 

V 21.9/K, V 21.9 P250GH / 1.0460 C 22.8 / 1.0460 

Body P250GH / 1.0460 C 22.8 / 1.0460 

Yoke P240GH / 1.0619 GS-C 25 / 1.0619 

Seat 1.4370 1.4370 

Plug and plug seat 1.4021 1.4021 

Bellows seal 1.4571 1.4571 

Body gasket Graphite / CrNi Graphite / CrNi 

Hand wheel EN-JL 1030 / EN GJL-200 GG 20

Condensate Collector and Steam Manifold 

PN 0, DN 0 

V 20. /K, V 20. 

DN 15 

DN 20 

DN 25 

C 

B 

A M16 

A 

∅ 80 

DN 40 

Section A-A 

230 

C 

60° 

D 

B 

L 

Section B-D 

TOP 

A 

BOTTOM 

50 

DN 15 

DN 20 

DN 25 

73 

215 

Description 

Compact-type condensate collector (vertical design) 

with internal immersion tube and integrated bellowssealed 

stop valves (V 20.8/K). Without immersion 

tube as steam manifold V 20.8 with integrated 

bellows-sealed stop valves. Lateral connections 

in DN 15, 20 or 25 available. Collecting tube in 

DN 40. 

Connections 

Butt-weld ends 

Socket-weld ends 

Flanged EN, PN 40 



Dimensions and Weights 

Number 

of lateral 

connections 


butt-weld ends 

Weight 

(without 

steam traps) 

Function V 20.8/K 

The condensate discharged by the steam trap flows 

downwards between immersion tube and external 

collecting tube, thereby creating a water pocket into 

which the immersion tube enters. The space between 

immersion tube and collecting tube above the water 

pocket acts as a dampening cushion consisting of 

flash steam and air bubbles. This steam cushion 

effectively prevents water hammer like a dampening 

pot. 

The condensate flowing into the unit will be forced 

into the higher condensate collecting line as a 

function of its service pressure (differential pressure). 


flanges PN 40 1) 

Weight 

(without 

steam traps) 

A B C L approx. kg A B C L 2) approx. kg 

2 45 160 90 152 4 92 160 184 236 9 

4 45 160 250 152 8 92 160 344 236 17 

6 45 160 410 152 12 92 160 504 236 25 

8 45 160 570 152 16 92 160 664 236 34 

10 45 160 730 152 20 92 160 824 236 43 

12 45 160 890 152 24 92 160 984 236 51 

1 ) Dimensions, weights, ASME flange connections see data sheet 

2 ) DN 15 L = 232 mm 


Flanges PN 40 EN 1092-1 / Butt-weld ends DiN 3239-1 / 1.0460 (P250GH / C 22.8) 



Flanges B16.5 Class 300, Butt-weld ends B16.25 Sched. 40 / 1.0460 (P250GH / A105) 



Materials 

V20.8 

V20.8/K 

EN ASTM 

Body P250GH (1.0460) A105 

Immersion tube (V20.8/K) 1.0305 A106* 

Handwheel Sheet steel Sheet steel 

Pressure piece for packing 1.0401 A 576-1015* 

Gasket 1.0330 A109* 

Stem 1.4104 AISI 430 F* 

Plug 1.4034 Chromium steel (13 %) 

Plug seat 1.4104 AISI 430 F* 

Top piece 1.0501 A 576-1035* 

Wiper ring Novapress Novapress 

Packing Graphite Graphite 

Locknut 1.0501 A 576-1035* 

*) ASTM nearest equivalent grade is stated for guidance only. 


2 

A1

GESTRA Gravity Circulation Checks, 

DISCO Non-Return Valves and DISCO Swing Check Valves 

DISCO Non-Return Valves 

Gravity Circulation Checks and DISCO Non-Return Valves 

for sanitation applications and hvac systems. 

Type SBO 11, Type SBO 21, Type SBO 31 .................................................................................... 31 

Type RK 70, Type RK 71........................................................................................................... 32 – 33 

Type MB 14 ............................................................................................................................. 32 – 33 

DISCO Non-Return Valves for industrial applications and hvac systems. 

Type RK 41, Type RK 44, Type RK 44 S ................................................................................... 34 – 35 

Type RK 76 ............................................................................................................................. 34 – 35 

Type RK 86 ............................................................................................................................. 36 – 37 

Type RK 86 A .......................................................................................................................... 36 – 37 

DISCO Non-Return Valves for special applications. 

Type RK 16 A, Type RK 16 C .................................................................................................... 38 – 39 

Type RK 26 A ...........................................................................................................................38 – 39 

Type RK 49 ..............................................................................................................................40 – 41 

Type RK 29 A .......................................................................................................................... 42 – 43 

DISCO Check Valves 

DISCOCHeCK Dual-Plate Check Valves BB, DIN design 1 ) 

Wafer-type valves DN 50 – 1200 mm (2 – 48"), PN 6 – 160 ................................................... 44 – 47 

DISCO Swing Check Valves CB 

Wafer-type valves DN 50 – 300 mm (2 – 12"), PN 6 – 40 ....................................................... 48 – 49 

Swing Check Valves WB 

Wafer-type valves DN 50 – 300 mm (2 – 12"), PN 10/16 ........................................................ 50 – 51 

NAF-Check Valves 

Wafer-type valves DN 40 – 1000 mm (1 1 /2 – 40"), PN 10 – 100 .............................................. 52 – 53 

1 ) DISCOCHECK Dual-Plate Check Valves BB also available in ASME design. 

Page 

29 

A2

GESTRA DISCO Non-Return Valves 

30 

GESTRA DISCO Non-Return Valves Type RK 86 and 86A 

These non-return valves feature a patented universal 

centering body. Standard valves fit between flanges 

PN 6-40, Class 150/300 as well as between BS10 flanges. 

Body material: stainless steel or austenitic steel.

Gravity Circulation Checks SBO, PN 6 

Pressure Drop Charts 

Downstream of circulating pumps in heating and hot water installations to prevent gravity 

circulation. 

Pressure/Temperature Ratings / Material 

Dimensions 

SBO 11, SBO 21 SBO 31 

Curve 1: SBO 21 DN 1" 


Outlet: Screwed female 

Inlet: Union nut 

SBO 11 

Outlet: Screwed male 

Inlet: Union nut 

SBO 21 

Outlet: Screwed male 

Inlet: Screwed female 

SBO 31 

L 

L 

L 

Curve 3: SBO 21 DN 1 1 /4" 

Curve 4: SBO 11 DN 1 1/4" 

Application 

Partial opening / instable range Full opening / stable range 

Volume flow V˙ w 

Pressure drop ∆p [bar] 

Max. service Max. service Materials 

pressure [bar] temperature [°C] Body Valve cone 

6 130 1 ) Brass (CW614N) PPO 

1 ) Max. service temperature at atmospheric pressure 

Type SBO 11 SBO 21 SBO 31 

Size DN 1" 1 1 /4" 1" 1 1 /4" 3 /4" 1" 1 1 /4" 

Opening Pressures 

L [mm] 66 82 57 70 39 40 45 

Connections Inlet 2 ) G 11 /2 G 2 G 11 /2 G 2 

(BSP thread) Outlet G 1 G 11/4 G 1 G 11/4 2) SBO 11 and SBO 21: Thread of union nut 

Differential pressures at zero volume flow. 

Type DN Opening pressure [mbar] 

Direction of flow 

with- 

out with spring 

spring 

X X V Y 

SBO 11 

1" 

1 

1 7 6 6 

1 /4" 

SBO 21 

1" 

1 

1 7 6 5 

1/4" 

3/4" 

SBO 31 1" 

1 

2 9 7 5 

1/4" 

Curve 1: SBO 31 DN 3/4" 


G 1 1/4 G 1 1/2 G 2 

Partial opening / instable range Full opening / stable range 

Volume flow V˙ w 

Pressure drop ∆p [bar] 

Curve 3: SBO 31 DN 1 1/4" 

31 

A2

DISCO ® Non-Return Valves RK, PN 6 to PN 16 

Screwed Non-Return Valves MB, PN 16 

32 

L 

RK 70 (lower part) / RK 71 (upper part) 

DN 15 – 100 mm 

L 

RK 70 

DN 125 – 200 mm 

L 

MB 14 

Ø D 

Ø D 

Application 

Type PN 

For liquids, especially suited for heating and hot-water 

RK 70 6 installations. Application as gravity circulation check and 

check valve. 

RK 71 16 

MB 14 16 

Body Material 

Dimensions 

DN [mm] 15 20 25 32 40 50 65 80 100 125 150 200 


For liquids, gases, vapours. Application as gravity 

circulation check, vacuum breaker, breather, foot valve, 

pressure-relief valve or pressure-maintaining valve 

Type Nominal sizes DN EN reference ASTM equivalent 1) 

RK 70 Body 15 – 100 mm Brass (CW617N) Brass 

Valve disk Plastic PPe – 

Body 125 – 200 mm Grey cast iron (eN-JL 1040) A126 Class A 

Plug Plastic Polyamid 6 – 

RK 71 Body 15 – 100 mm Brass (CW617N) Brass 

Valve disk 1.4571 AISI 316 Ti 

MB 14 Body 15 – 50 mm Brass (CW614N) Brass 


1) ASTM material similar to EN material. 

Observe different physical and chemical properties! 

[in] 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4 5 6 8 

L [mm] 16 19 22 28 31.5 40 46 50 60 90 106 140 

RK 70 D [mm] 40 47 56 72 82 95 115 132 152 184 209 264 

RK 71 D [mm] 40 47 56 72 82 95 115 132 152 – – – 

L [mm] 49 49 61 61 72 72 – – – – – – 

MB 14 D [mm] 42 42 62 62 83 83 – – – – – – 

A.F. [mm] 30 30 46 46 65 65 – – – – – – 

Type PN Nominal sizes DN PMA / TMA / [bar] / [°C] 

RK 70 6 15 – 100 6 / -30 1.5 / 100 0.5 / 130 

6 125 – 200 6 / -10 1.5 / 100 0.5 / 130 

RK 71 16 15 – 100 16 / -60 14 / 200 13 / 250 

MB 14 16 G 1 /2 – G 2 16 / -60 14 / 200 13 / 250 

RK Designs 

Type Seat Spring 

metal-to EPDM FPM PTFE without special Nimonic 

metal spring spring spring 

RK 70 (Plastic) – – – – – – Use 

RK 71 X Use RK 41 Use Use RK 41 – 

RK 86 

RK 86 

MB 14 X – – – – – – – 

X : standard 

– : not available 

Earthing 

connection


Screwed Non-Return Valves MB, PN 16 



RK 71*) 

DN Opening pressures [mbar] 

RK 70*) 


without with spring 

spring 

X X V Y 

15 2.5 10 7.5 5 

20 2.5 10 7.5 5 

25 2.5 10 7.5 5 

32 3.5 12 8.5 5 

40 4.0 13 9 5 

50 4.5 14 9.5 5 

65 5.0 15 10 5 

80 5.5 16 10.5 5 

100 6.5 18 11.5 5 




spring 

X X V Y 

15 0.4 7.8 7.4 7 

20 0.4 7.8 7.4 7 

25 0.4 7.8 7.4 7 

32 0.5 9 8.5 8 

40 0.5 9.5 9 8.5 

50 0.6 9.7 9.1 8.5 

65 0.7 10.4 9.7 9 

80 0.8 11.6 10.8 10 

100 0.9 12.3 11.4 10.5 

125 2.0 9.0 7.0 5.0 

150 2.5 10.0 7.5 5.0 

200 2.5 10.0 7.5 5.0 

*) RK 70, 71 are not available with 

special spring or without spring 


The curves given in the chart are valid for water 

at 20 °C. To read the pressure drop for other 

fluids the equivalent water volume flowrate 

must be calculated and used in the graph. 

The values indicated in the chart are applicable 

to spring-loaded valves with horizontal flow. 

With vertical flow insignificant deviations occur 

only within the range of partial opening. 

RK 70, RK 71 

MB 14 

V · W = V · · 

V · W = equivalent water volume flow 

in [l/s] or [m3/h] ρ = Density of fluid 

(operating condition) in [kg/m3] V · = Volume of fluid (operating 

condition) in [l/s] or [m3/h] ρ 

1000 

When selecting valve please consider: 

Partial opening/ Full opening/ 

instable range stable range 




33 

A2


34 

L 

RK 41/ RK 44 / RK 44S 

DN 15 – 100 mm 

RK 41 / RK 44 / RK 44S 

DN 125 – 200 mm 

L 

L 

RK 76 

DN 15 – 100 mm 

Ø D 

Ø D 

Ø D 

Application 

Type PN 

RK 41 16 For liquids, gases, vapours. Application as gravity circulation 

RK 44 16 check, vacuum breaker, breather, foot valve, pressure-maintaining valve, 

RK 44S 16 check valve. 

RK 76 40 RK 41 especially suited for heating installations, RK 44 and RK 44S 

for sea water and drinking water, RK 76 for industrial applications 

Body Material 

Type Nominal sizes (DN) EN reference ASTM equivalent 1 ) 

RK 41 Body 15 – 100 mm Special brass (CW710R) Special Brass 

Dimensions 

Pressure/Temperature Ratings with metal-to-metal seat 


RK 41 

RK 44 

DN [mm] 15 20 25 32 40 50 65 80 100 125 150 200 

[in] 1 /2 3 /4 1 1 1 /4 1 1 /2 2 2 1 /2 3 4 5 6 8 

L [mm] 16 19 22 28 31,5 40 46 50 60 90 106 140 

RK 41 D [mm] 40 47 56 72 82 95 115 132 152 184 209 264 

RK 44 D [mm] 42 49 58 74 84 97 117 132 152 184 209 264 

RK 44S D [mm] 42 49 58 74 84 97 117 132 152 184 209 264 

RK 76 D [mm] 45 55 65 75 85 98 118 134 154 – – – 

16 15 – 100 16 / -60 14 / 200 13 / 250 

16 125 – 200 16 / -10 13 / 200 13 / 300 

16 15 – 100 16 / -200 14 / 200 13 / 250 

16 125 – 200 16 / -10 14 / 200 13 / 250 

RK 44S 16 15 – 200 16 / -200 16 / 90 16 / 90 

RK 76 40 / Cl 300 15 – 100 49.6 / -10 35.8 / 200 31.6 / 300 

Designs 


Body 125 – 200 mm Grey cast iron (eN-JL 1040) A126 Class B 

Plug 1.4006 A182 F6 

RK 44 Body 15 – 100 mm Bronze (CC480 K-GS) B584 C90500 


Body 125 – 200 mm Grey cast iron (eN-JL 1040) A126 Class B 

Plug Bronze (CC480 K-GS) B584 C90500 

RK 44S Body 15 – 100 mm Bronze (CC480 K-GS) B584 C90500 

Valve disk Bronze (CW352H) – 

Body 125 – 200 mm Bronze (CC483 K-GC) B505 C90700 

Plug Bronze (CC480 K-GS) B584 C90500 

RK 76 Body 15 – 100 mm 1.4107 A217-CA15 


1 ) ASTM material similar to EN material. 


Type Seat Springs 

metal-to- EPDM FPM PTFE without special Nimonic 

metal (–40 up to (–25 up to (–190 up to spring spring spring 

150°C) 2 ) 200°C) 2 ) 250°C) 2 ) 

RK 41 X O O – O O – 

RK 44 X O O – O O – 

RK 44S X O O – O – – RK 86 

RK 76 X O O O O O O 

2) Observe pressure/temp. ratings of the equipment X : standard O : optional – : not available 

Earthing 

connection 

Use


Short overall length according to DIN EN 558-1, table 11, series 49 

(=^ DIN 3202, part 3, series K4) 










V · W = V · · 


in [l/s] or [m3 /h] 

ρ = Density of fluid 



1000 



RK 41, RK 44, RK 76 1 ) 




spring 

X X V Y 

15 2.5 10 7.5 5 

20 2.5 10 7.5 5 

25 2.5 10 7.5 5 

32 3.5 12 8.5 5 

40 4.0 13 9 5 

50 4.5 14 9.5 5 

65 5.0 15 10 5 

80 5.5 16 10.5 5 

100 6.5 18 11.5 5 

125 12.5 35 22.5 10 

150 14.0 38 24.0 10 

200 13.5 37 23.5 10 

1) only DN 15-100 

RK 41, RK 44, RK 44S RK 76 




RK 41, RK 44 DN 125-200 

RK 44S DN 15-200 

RK 44S 




spring 

X X V Y 

15 2.5 25 22.5 20 

20 2.5 25 22.5 20 

25 2.5 25 22.5 20 

32 3.5 27 23.5 20 

40 4.0 28 24.0 20 

50 4.5 29 24.5 20 

65 5.0 30 25.0 20 

80 5.5 31 25.5 20 

100 6.5 33 26.5 20 

125 12.5 35 22.5 10 

150 14.0 38 24.0 10 

200 13.5 37 23.5 10 




35 

A2




36 

D min. 

RK 86 / RK 86 A 

DN 15 – 100 mm 

D max. 

RK 86 / RK 86 A 

DN 15 – 100 mm 

L 

L 

RK 86 / RK 86 A 

DN 125 – 200 mm 

Ø D min. 

Ø D 

Ø D max. 

RK 86 and RK 86 A – Our Robust All-Rounder 

Application 

Type PN 

RK 86 40/class 300 

RK 86 A 40/class 300 

Body Material 


Typ PN DN PMA / TMA / [bar] / [°C] 

RK 86 

For liquids, gases, vapours. Application as gravity 

circulations check, vacuum breaker, breather, foot valve, 

pressure-maintaining valve, check valve. 

RK 86 A especially suited for low temperatures, 

aggressive fluids, boiler feedwater lines, and other 

industrial applications. 

Type Nominal sizes DN EN reference ASTM equivalent 1 ) 

RK 86 Body 15 – 100 mm Chromium steel, 1.4317 A 743-CA6-NM 

40/class 300 15 – 100 51 / -10 43.9 / 200 36.9 / 350 

40/class 300 125 – 200 51 / -10 43.9 / 200 34.5 / 400 

RK 86 A 40/class 300 15 – 200 49.6 / -200 35.8 / 200 24 / 550 

Designs 


metal-to- EPDM FPM PTFE 3) without special Nimonic 

metal (–40 up to (–25 up to spring spring spring 4 ) 

150°C) 2 ) 200°C) 2 ) 

RK 86 X O O O O O O X 

RK 86A X O O O O O O X 

2) Observe pressure/temp. ratings of the equipment 

3) DN 15-100 –190 °C up to 250 °C; DN 125-200 –60 up to 200 °C 

4) Required for temperatures above 300 °C 

X : standard 

O : optional 


Body 125 – 200 mm GP240GH (1.0619) A 216 WCB 

Plug 1.4107 A217-CA15 

RK 86A Body 15 – 200 mm 1.4408 A 351 CF 8M 

Valve disk/plug 1.4571 AISI 316 Ti 



Dimensions 

Nominal 

sizes 

Overall 

dimensions 

[mm] 

∅ D 

[mm] 15 20 25 32 40 50 65 80 100 125 150 200 

[Inch] 1 /2 3 /4 1 1 1 /4 1 1 /2 2 2 1 /2 3 4 5 6 8 

L 16 19 22 28 31,5 40 46 50 60 90 106 140 

∅ D min 44 53 64 73 83 96 110 128 151 – – – 

∅ D max 67 76 82 93 104 118 136 158 186 – – – 

PN 10/16 – – – – – – – – – 194 220 275 

PN 25 – – – – – – – – – 194 226 286 

PN 40 – – – – – – – – – 194 226 293 

Class 125/150 – – – – – – – – – 194 220 275 

Class 300 – – – – – – – – – 216 251 308 

Weight [kg] 0.27 0.38 0.52 0.8 1.12 1.78 2.43 3.37 5.34 11 14 25 

Earthing 

connection











V · W = V · · 




condition) in [l/s] or [m3 ρ 

1000 

/h] 

RK 86, 86A 



RK 86, RK 86 A 







spring 

X X V Y 

15 2.5 10 7.5 5 

20 2.5 10 7.5 5 

25 2.5 10 7.5 5 

32 3.5 12 8.5 5 

40 4.0 13 9 5 

50 4.5 14 9.5 5 

65 5.0 15 10 5 

80 5.5 16 10.5 5 

100 6.5 18 11.5 5 

125 12.5 35 22.5 10 

150 14.0 38 24.0 10 

200 13.5 37 23.5 10 

37 

A2

DISCO ® Non-Return Valves RK, PN 40 



38 

L 

RK 16 A, RK 16 C 

DN 15-100 

L 

RK 26 A 

DN 15-100 

Ø D 

Ø D 

Application 

Type PN 

RK 16 A 

RK 16 C 

RK 26 A 

Body Material 

Dimensions 

40/class 300 

40/class 300 

40/class 300 

For liquids, gases, vapours. Application as check valve, breather, 

foot valve, pressure-relief valve or pressure-maintaining valve. 

RK 26 A and RK 16 C for aggressive fluids and low temperatures. 


RK 16A Body 15 – 100 mm 1.4571 AISI 316 Ti 


RK 16C Body 15 – 100 mm 2.4610 Hastelloy C 

Valve disk 2.4610 Hastelloy C 

RK 26A Body 15 – 100 mm 1.4408 A351 CF8M 




DN [mm] 15 20 25 32 40 50 65 80 100 125 150 200 

[in] 1 /2 3 /4 1 11 /4 11 /2 2 21 /2 3 4 5 6 8 

L [mm] 25 31.5 35.5 40 45 56 63 71 80 110 125 160 

RK 16 A D [mm] 52 63 72 81 93 108 128 143 1632) 

169 

– – – 

3) 

RK 16 C D [mm] 52 63 72 81 93 108 128 143 1632 ) 

169 

– – – 

3) 

RK 26 A D [mm] 52 63 72 81 93 108 128 149 1632) 

169 

– – – 

3 ) 

2 ) PN 10/16 3 ) PN 25/40 



RK 16 A 40/Class 300 15 – 100 mm 49.6 / -200 35.8 / 200 24 / 550 

RK 16 C 40/Class 300 15 – 100 mm 49.6 / -200 35.8 / 200 29.3 / 400 

RK 26 A 40/Class 300 15 – 100 mm 49.6 / -200 35.7 / 200 25 / 550 

Designs 

Type 

meta-tometal 

EPDM 

(–40 up to 

150°C) 4 ) 

Seat Spring 

FPM 

(–25 up to 

200°C) 4 ) 

PTFE 

(–190 up to 

250°C) 4 ) 

without 

spring 

special 

spring 

Nimonic 

spring 5 ) 

X : standard 

O : optional 


Earthing 

connection 

RK 16 A X O O O O O O O 

RK 16 C X – – – O – – O 

RK 26 A X O O O O O O O 

4 ) Observe pressure/temp. ratings of the equipment 

5 ) Required for temperatures above 300 °C.

DISCO ® Non-Return Valves RK, PN 40 




The curves given in the chart are valid for water at 

20 °C. To read the pressure drop for other fluids the 

equivalent water volume flowrate must be calculated 

and used in the graph. 

The values indicated in the chart are applicable to 

spring-loaded valves with horizontal flow. With vertical 

flow insignificant deviations occur only within the 

range of partial opening. 



RK 16 A, RK 26 A 




spring 

X X V Y 

15 2.5 10 7.5 5 

20 2.5 10 7.5 5 

25 2.5 10 7.5 5 

32 3.5 12 8.5 5 

40 4.0 13 9 5 

50 4.5 14 9.5 5 

65 5.0 15 10 5 

80 5.5 16 10.5 5 

100 6.5 18 11.5 5 

RK 16 A, RK 16 C (dashed lines apply to RK 16 A) 




(RK 16C) 

V · W = V · · 






1000 

/h] 



RK 16 C 




spring 

X X V Y 

15 2.5 25 22.5 20 

20 2.5 25 22.5 20 

25 2.5 25 22.5 20 

32 3.5 27 23.5 20 

40 4.0 28 24.0 20 

50 4.5 29 24.5 20 

65 5.0 30 25.0 20 

80 5.5 31 25.5 20 

100 6.5 33 26.5 20 

RK 26 A 




39 

A2




40 

RK 49, DN 15 – 65 mm 

L 

L 

RK 49, DN 80 – 200 mm 

Ø D 

Ø D 

Application 

Type PN 

RK 49 160 

Body Material 


RK 49 Body 15 – 65 mm 1.4581 A351 CF8 



RK 49 

Valve disk 1.4986 – 

Body 80 – 200 mm 1.7357 A217 WC6 

Plug 1.4922 – 

1 ) ASTM material similar to EN material. 


Dimensions 

160 

For liquids, gases, vapours and aggressive fluids. 

Used as non-return valve (for unidirectional flow), vacuum breaker or 

priming foot valve. RK 49 for high pressures and temperatures 

DN [mm] 15 20 25 32 40 50 65 80 100 125 150 200 

[in] 1 /2 3 /4 1 1 1 /4 1 1 /2 2 2 1 /2 3 4 5 6 8 

L [mm] 25 31.5 35.5 40 45 56 63 71 80 110 125 160 

RK 49 D [mm] 54 63 74 84 95 110 130 147 173 209 245 301 

Designs 

Type 

metal-tometal 

15 – 65 160 / -10 136.5 / 200 110.8 / 550 

80 – 200 160 / -10 160 / 200 55.3 / 530 

Seat Springs 

EPDM FPM PTFE 

without 

spring 

special 

spring 

Nimonic 

spring 2 ) 

Earthing 

connection 

RK 49 X – – – O – X O 

2) Required for temperatures above 300 °C. X : standard 

O : optional 

– : not available





The curves given in the chart are valid for water at 

20 °C. To read the pressure drop for other fluids the 

equivalent water volume flowrate must be calculated 

and used in the graph. 

The values indicated in the chart are applicable to 

spring-loaded valves with horizontal flow. With vertical 

flow insignificant deviations occur only within the 

range of partial opening. 



RK 49 




spring 

X X V Y 

15 16.5 73 56.5 40 

20 17.5 74 57.0 40 

25 18.0 76 58.0 40 

32 18.0 76 58.0 40 

40 19.5 79 59.5 40 

50 22.0 84 62.0 40 

65 23.0 87 63.0 40 

80 17.5 75 57.5 40 

100 20.0 80 60.0 40 

125 23.0 86 63.0 40 

150 24.0 88 64.0 40 

200 29.0 98 69.0 40 

V · W = V · · 






1000 

/h] 

RK 49 




41 

A2


∅ D 

∅ D 

42 

RK 29 A, DN 15-40 mm 

PN 63/100/160/250/320/400 

ASME Class 400/600/900/1500/2500 

RK 29A, DN 50-200 mm 

PN 250/320/400 

ASME Class 1500/2500 

RK 29A, DN 50-200 mm 

PN 63/100/160 

ASME Class 400/600/900 

L 

L 

Application 

Type PN 

RK 29 A 

Materials 

Pressure/Temp. Ratings acc. EN 1092-1, material group 15E0 

Type RK 29A Max. service pressure [bar] at temperature [°C] 

Pressure rating – 200 200 500 

PN 63 63 53.8 44.2 

PN 100 100 85.3 70.2 

PN 160 160 136.5 112.4 

Pressure/Temp. Ratings acc. ASME B 16.5, material group 2.4 

Type RK 29A Max. service pressure [bar] at temperature [°C] 

Pressure rating – 218 200 500 

class 400 66.2 51.1 37.6 

class 600 99.3 76.6 56.6 

class 900 148.9 114.9 84.7 

Tightness of seat in accordance with DIN 3230, part 3, leakage rate BN 2, BO 3. 

Sealing surfaces machined according to eN 1092-1, form B2, ASMe B 16.5 RF 

smooth finish (63-125 µin). 

Other designs available on request. 

Designs 

63 – 400 

Cl 400 – 2500 


metal-to- EPDM FPM PTFE without special Nimonic 

metal (–40 up to (–25 up to (–190 up to spring spring spring 3) 

150°C) 2 ) 200°C) 2 ) 250°C) 2 ) 

RK 29A X – – – O – X O 

2) Observe pressure/temp. ratings of the equipment 

3 ) Required for temperatures above 300 °C. 

For large pressure ratings and special tasks. 


RK 29A Body 15 – 200 mm 1.4571 AISI 316 Ti 

Plug 1.4571 AISI 316 Ti 



Dimensions RK 29A 

PN 63 PN 100 PN 160 class 400 class 600 class 900 

DN L D L D L D L D L D L D 

15 35 63 35 63 35 63 35 54 35 54 35 63 

25 40 84 40 84 40 84 40 73 40 73 40 79 

40 56 105 56 105 56 105 56 95 56 95 56 98 

50 56 115 56 121 56 121 56 111 56 111 56 142.5 

80 71 149 71 156 71 156 71 149 71 149 71 168 

100 80 176 80 183 80 183 80 176 80 193.5 80 205 

150 125 250 125 260 125 260 125 247.5 125 266.5 125 288.5 

200 160 312 160 327 160 327 160 304.5 160 320.5 160 358.5 

PN 250 – 400 see data sheet. Cl 1500 and 2500 see data sheet. 

X : standard 

O : optional 


Earthing 

connection




at 20 °C. To read the pressure drop for other fluids 

the equivalent water volume flowrate must 

be calculated and used in the graph. 





V · W = V · · 





1000 

RK 29A 

Volume flow V · w 

Pressure drop 



RK 29 A 


Partial opening/ instable range Full opening / stable range 



without spring with spring with spring with spring 

X X V Y 

– PN 160 – PN 400 – PN 160 – PN 400 – PN 160 – PN 400 – PN 400 

– Cl 900 – Cl 2500 – Cl 900 – Cl 2500 – Cl 900 – Cl 2500 – Cl 2500 

15 6 6 22 22 16 16 10 

25 8 8 26 26 18 18 10 

40 10 10 30 30 20 20 10 

50 10 10 30 30 20 20 10 

80 11 13 32 36 21 23 10 

100 12 24 34 58 22 34 10 

150 18 – 46 – 28 – 10 1 ) 

200 21 – 52 – 31 – 101) 1) only for PN 63-400 

43 

A2

DISCOCHECK ® Dual-Plate Check Valves BB 



44 

Ø D 

Ø D 

L 

80° 

DN 50 – 125 mm 

L 

80° 

DN 150 – 500 mm 

DN 600 – 1200 only in grey cast iron 

A 

A 

Application 

For liquids, gases, vapours. In heating, air-conditioning, water-supply and cooling installations, steam and condensate 

systems, oil pipelines and natural gas lines. 

For use with sea water, in sewage works, downstream of fans and compressors. 

For drinking water: with lining, and for sea water with rubber lining. 

With adjustable dampers for installations with waterhammer problems. 

Metal-to-metal or soft seat (ePDM, FPM). 

Materials 

Design Part designation 


Nominal size EN ASTM 

DN reference equivalent 1) 

Grey cast iron Body 150 – 1200 eN-JL 1040 A 126 Class A 

(BB ... G) Dual plate 150 – 1200 eN-JS 1030 A 536 60-40-18 

Carbon steel Body 100 + 125 1.0460 A 105 

(BB ... C) Body 150 – 500 1.0619 A 216 WCB 

Dual plate 100 + 125 1.4006 A 182 F6 

Dual plate 150 – 500 1.0619 A 216 WCB 

Stainless steel Body 50 – 125 1.4404 A 182 F 316 L 

Body 150 – 500 1.4408 A 351 CF 8 M 

Dual plate 50 – 125 1.4404 A 182 F 316 L 

Dual plate 150 – 500 1.4408 A 351 CF 8 M 


Max. service pressure [bar] 

Design Type PN at temperature [°C] 2) 

Grey cast iron 

down to –10 °C 

at nominal 

pressure 

Carbon steel 

down to –10 °C 

at nominal 

pressure 

Stainless steel 

down to 

–200 °C 

at nominal 

pressure 

20 100 150 200 250 300 350 400 450 500 550 

BB 11 G / 21 G 6 6 6 5.4 4.8 4.2 3.6 – – – – – 

12 G / 22 G 10 10 10 9.0 8.0 7.0 6.0 – – – – – 

14 G / 24 G 16 16 16 14.4 12.8 11.2 9.6 – – – – – 

BB 12 C / 22 C 10 10 10 10 9.6 8.9 7.6 7.1 6.7 6.4 – – 

14 C / 24 C 16 16 16 16 15.3 14.2 12.1 11.4 10.7 10.3 – – 

15 C / 25 C 25 25 25 25 23.9 22.2 18.9 17.8 16.7 16.1 – – 

16 C / 26 C 40 40 40 40 38.2 35.6 30.2 28.4 26.7 25.8 – – 

17 C 63 63 58.5 54.6 47.6 44.8 40.6 37.8 36.4 – – – 

18 C 100 100 93.3 86.7 75.6 71.1 64.4 60 57.8 – – – 

19 C 160 160 149.3 138.7 121 113.8 103 96 92.5 – – – 

BB 12 A / 22 A 10 10 9.8 9.1 8.5 8.1 7.8 7.5 7.3 7.2 7 6.9 

14 A / 24 A 16 16 15.6 14.6 13.7 13 12.4 12 11.7 11.4 11.2 11.1 

15 A / 25 A 25 25 24.4 22.8 21.3 20.3 19.4 18.8 18.2 17.9 17.6 17.3 

16 A / 26 A 40 40 39.1 36.4 34.1 32.5 31.1 30 29.2 28.6 28.1 27.7 

17 A 63 63 61.6 57.4 53.8 51.2 49 47.3 45.9 45.1 44.2 43.7 

18 A 100 100 93.3 86.7 82.2 77.8 74.2 71.6 69.3 67.6 66.2 63.1 

19 A 160 160 149.3 138.7 131.5 124.5 118.7 114.6 110.9 108.2 105.9 101.0 

2 ) For temperatures above +300 °C special springs of Inconel X 750 are required. 

BB 12A-18A DN 50 – 125 applicable up to max. 500 °C. 

If PN > 40 ask for corresponding data sheets. 

If DN > 500 and made from grey cast iron ask for corresponding data sheets.


DIN design DN 50 – 1200 mm, PN 6 – 160 1) 

BB Designs 

Type Seat Lining 

metal-to- EPDM FPM NBR PTFE 2) VESTOSINT ® 4) Rubber 5) 

metal (–40 up to (–25 up to (–30 up to (–25 up to 

150°C) 1) 200°C) 1) 110°C) 1) 200°C) 1) 

BB.....G O X O O – O 6 ) O 6 ) 

BB.....C X O O O O 3 ) O 6 ) O 6 ) 

BB.....A X O O O O 3 ) – – 

1 ) Observe pressure / temp. ratings of equipment 

X : standard O : optional – : not available 

2) Cover FPM ring with PTFE 

3) From DN 150. Not possible for smaller sizes. 

4 ) Inside and outside of body lined with VESTOSINT ®, seat made of EPDM. Internals either of bronze or 

of stainless steel. Temp. range –10 °C up to 80 °C. 

5 ) Inside of body lined with rubber, seat made of EPDM. Internals either of bronze or of stainless steel. 

Temp. range –10 °C up to 90 °C. 

6 ) From DN 150. For smaller sizes use “BB...A” 

Type Damper 7 ) Earthing Drain without Springs 

connection plug spring Inconel spring 8 ) 2 WA 10 ) 7 WA 11 ) 5 VO 12 ) 

BB.....G O – O O – O X O 

BB.....C O O O 9 ) O O O X O 

BB.....A – O O 9 ) O O O X O 

7 ) From DN 200 up to DN 500. 

X : standard O : optional – : not available 

8) 

Max. temperature rating 110 °C, see table “Pressure/Temperature Ratings BB with Dampers” 

Inconel X 750 (Required for temperatures above 300 °C). Opening pressure 7 mbar (spring 7 WAI). 

9 ) From DN 150 

10) Spring for 2 mbar opening pressure with horizontal installation. 

11) Spring for 7 mbar opening pressure (standard) with horizontal installation. 

12 ) Spring for 5 mbar opening pressure with vertical installation and downward flow. 

Pressure Drop Chart 

The chart is valid for water at 20 °C; 

for other fluids, the equivalent water volume 

flowrate must be calculated and used in the 

chart. 


to valves with 7 mbar springs with horizontal 

flow. With vertical flow deviations occur only 

within the range of partial opening. 

The dashed lines in the chart are valid for valves 

with 2 mbar springs with horizontal flow. 

The chart and the flow characteristics apply 

to values up to PN 40. For valves with higher 

pressure ratings (PN) the loss coefficients 

(zeta values) and the pressure drops are 

increased by approx. 20 %. The kvs values are 

correspondingly reduced. 

V · W = V · · 

ρ 

1000 


in [l/s] or [m 3/h] 


(operating condition) in [kg/m 3] 

V · = Volume of fluid (operating 

condition) in [l/s] or [m 3/h] 

1 ) If PN > 40 and DN > 500 mm ask for corresponding data sheets. 

Volume flow V · w 

Pressure drop 




with upward flow 


spring 7 WA 

7 WAI 2 WA 5 VO 

50 6 13 8 17 

65 6 13 8 17 

80 7 14 9 19 

100 7 14 9 19 

125 10 17 12 25 

150 11 (15) 18 (22) 13 (17) 27 (35) 

200 12 (18) 19 (25) 14 (20) 29 (41) 

250 14 (18) 21 (25) 16 (20) 33 (41) 

300 15 (25) 22 (32) 17 (27) 35 (55) 

350 17 (25) 24 (32) 19 (27) 39 (55) 

400 19 (25) 26 (32) 21 (27) 43 (55) 

450 22 29 24 49 

500 23 (28) 30 (35) 25 (30) 51 (61) 

Values indicated in brackets apply for BB 

17/18/19. 

45 

A2



Dimensions and Weights Type Code 

DN PN Dimensions [mm] Weight 2) 

D L A [kg] 

46 

10 109 2.5 

16 109 2.5 

50 3) 25 109 43 8 2.5 

40 109 2.5 

10 129 4 

16 129 4 

65 3 ) 25 129 46 11 4 

40 129 4 

10 144 6 

16 144 6 

80 3 ) 25 144 64 12 6 

40 144 6 

10 164 7 

16 164 7 

100 25 171 64 19 ,5 7.5 

40 171 ,5 7.5 

10 194 12 

16 194 12 

125 25 196 70 28 12 

40 196 12 

6 209 12 

10 220 ,513.5 

150 16 220 76 40 ,513.5 

25 226 14 

40 226 14 

6 264 ,518.5 

10 275 20 

200 16 275 89 64 20 

25 286 22 

40 293 23 

1) If PN > 40 and DN > 500 mm ask for corresponding data sheets. 

2) Weights rated for cast steel grade GP 240 GH (GS-C 25). 

3) DN 50, 65 and 80 only available as BB ... “A” (stainless steel). 

DN PN Dimensions [mm] Weight 2) 

D L A [kg] 

6 319 33 

10 330 35 

250 16 330 114 87 35 

25 343 38 

40 355 41 

6 375 44 

10 380 45 

300 16 386 114 110 47 

25 403 51 

40 420 55 

6 425 ,562.5 

10 440 67 

350 16 446 127 120 69 

25 460 73 

40 477 79 

6 475 ,580.5 

10 491 86 

400 16 498 140 142 88 

25 517 95 

40 549 1075 

6 530 12555 

10 541 13055 

450 16 558 

152 163 

13855 

40 574 14355 

6 580 14455 

10 596 15255 

500 16 620 152 181 16455 

25 627 16855 

40 631 17055 

BB 

2 

4 

C 

150 

FPM 

7 WA 

Valve Type 

Series 

1 – DN 50 – 125 mm and from 

DN 450 mm as well as from PN 63 

2 – DN 150 – 400 mm up to PN 40 

Pressure rating 

1 – PN 6 (only grey cast iron) 

2 – PN 10 

4 – PN 16 

5 – PN 25 

6 – PN 40 

Body material 

G – Grey cast iron 

C – Steel 

A – Austenitic steel 

Nominal size 

DN 50 – 500 

Seat 

HD – metal-to-metal 

ePDM 

FPM 

PTFe 

Springs/Opening pressures 

7 WA – Spring for 7 mbar with 

horizontal installation 

7 WAI – Inconel spring for 

7 mbar with 


2 WA – Spring for 2 mbar with 


5 VO – Spring for 5 mbar 

with downward flow 

Typical example: BB 24 C 150 FPM 7 WA 

explanatory note: Dual-plate check valve 

BB 24, PN 16, made of 

cast steel type GS-C 25, 

DN 150 mm with FPM 

gasket and spring (7 mbar) 

for horizontal installation.



BB with lining from DN 150 

Hard-rubber Plastic 

lining lining 

Dual plates, hinge pins and springs are not 

lined. Dual plates standard with O-rings of 

EPDM or on request with metal seating 

surface. 

BB with patented adjustable dampers, 

DN 200 – 800. 

BB with Lining 

Application 

Design with plastic lining: for drinking water and sea water. Design with rubber lining: 

for sea water. Design with dampers: to solve waterhammer problems. 

Metal-to-metal or elastic seat (ePDM, FPM) 

1 ) For pressure ratings > PN 40 and sizes > DN 500 please ask for corresponding data sheets. 

Temperature Limits 

Plastic lining –10°C up to 80°C 

Rubber lining –10°C up to 90°C 

BB with Dampers 

Application 

To solve waterhammer problems in pipelines carrying liquids.To evaluate possible 

waterhammer problems please ask for our questionnaire. 


Size DN 

[mm] 200 250 300 350 400 500 

[inch] 8 10 12 14 16 20 

Max. service pressure [bar] 16 16 13 9 13 9 

Max. service temperature [°C] 110 

Max. admissible pressure at 

line leading to the valve 

(pump switched off) 

[bar] 0.5 

47 

A2

DISCO ® Swing Check Valves CB 

DN 50 – 300 mm, PN 6 – 40 

48 

Ø D 

Ø D 

L 

a 

70° 

CB 14, DN 50 – 200 mm 

Ø D 

CB 14, DN 250 – 300 mm 

L 

L 

60° d 

CB 24 S, CB 26, CB 26 A 

DN 50 – 300 mm 

a 

d 

Application 

Type PN 

CB 14 16 

For liquids, gases, vapours: 

CB 14 for water and compressed air 

CB 24 S 16 CB 24 S for sea water, drinking water, swimming-pool water 

CB 26 40 For low temperatures 

CB 26 A 40 CB 26 A for aggressive fluids, drinking water, or swimming-pool water 

Materials 

Type Part designation 

CB 14 Body 50 – 300 mm 

CB 24 S 

CB 26 

CB 26 A 


Weights and Dimensions 

Nominal sizes 

EN reference 

ASTM 1 ) 

DN equivalent 

1.0038 A 284 B 

galvanized galvanized 

Flap 50 – 300 mm NBR NBR 

Body 

50 – 100 mm Bronze (CC 483K-GS) B 505 C 90 700 

125 – 300 mm Bronze (CC 332G) B 148 Alloy 952 

Flap 50 – 300 mm Bronze (CC 332G) B 148 Alloy 952 

Body 

50 – 200 mm 1.0460 A 105 

250 – 300 mm 1.0038 A 284 B 

50 – 80 mm 1.4581 A 351 CF 8 MC 

Flap 100 – 300 mm GGG-40.3 (eN-JS 1025) – 

Body 

50 – 200 mm 1.4571 AISI 316 TI 

250 – 300 mm 1.4581 A 351 CF 8 MC 

Flap 50 – 300 mm 1.4581 A 351 CF 8 MC 

1 ) Physical and chemical properties comply with EN grade. 

Type Nominal sizes DN PN PMA / TMA / [bar] / [°C] 

CB 14 50 – 300 mm 16 16 / -10 6 / 60 4 / 80 

CB 24 S 50 – 300 mm 16 16 / -200 16 / 90 2 )13 / 250 2 ) 

CB 26 50 – 200 mm 40 40 / -10 30 / 200 20 / 350 

250 – 300 mm 40 40 / -10 27 / 200 21 / 300 

CB 26 A 50 – 300 mm 40 40 / -10 32 / 200 26 / 450 

2 ) Max. pressure/temperature rating for CB 24 S without springs. 

CB Designs 


metal-to- NBR EPDM FPM PTFE 4) without special 

metal (–30 up to (–40 up to (–25 up to (–25 up to spring spring 

110°C) 3) 150°C) 3) 200°C) 3) 200°C) 3) 

CB 14 – X 5 ) – – – X – 

CB 24S O X O O – O – 

CB 26 O – X O O O – 

CB 26A O – X O O O – 

3) Observe pressure / temp. ratings of the equipment 4) Cover FPM ring with PTFE 

5) Flap made from NBR (Perbunan) Temp. range: –10 °C up to 80 °C 

Nominal size Dimensions [mm] Weight [kg] 

DN CB 14 CB 24 S, CB 26, CB 26 A 

CB14 CB 24 S 

CB 26 

[mm] [in] D L a d 6 ) D L a d 6 50 2 

) 

98 14 45 47 98 17 40 50 0.7 0.9 

CB 26 A 

0.9 

65 21 /2 118 14 60 64 118 20 50 64 1.0 1.4 1.4 

80 3 132 14 70 75 132 24 58 75 1.4 2.0 2.0 

100 4 154 14 90 98 154 27 72 99 1.5 3.1 3.1 

125 5 184 16 115 124 184 32 88 125 2.5 5.2 5.3 

150 6 209 16 145 148 209 32 112 144 3.3 6.7 6.9 

200 8 264 18 185 196 264 42 150 198 5.5 13.7 14.1 

250 10 319 35 220 242 319 47 182 244 11.2 22.9 23.6 

300 12 375 43 270 288 375 52 216 292 14.0 32.8 33.8 

6 ) Minimum flange bore and inside pipe diameter. 

X : standard 

O : optional 

– : not available

DISCO ® Swing Check Valves CB 

DN 50 – 300 mm, PN 6 – 40 







to valves with horizontal flow. With vertical flow 

insignificant deviations occur only within the 

range of partial openings. 

V · W = V · · 

ρ 

1000 


in [l/s] or [m 3/h] 


(operating condition) in [kg/m 3] 

V · = Volume of fluid (operating 

condition) in [l/s] or [m 3 /h] 



Type DN Opening pressures 

[mm] [mbar] 


X V Y 

CB 14 50 – 150 8 0 1 ) 

200 – 300 15 0 

Type DN Opening pressures 

[mm] [mbar] 


without 

spring 

with spring 

X X V 

CB 24 S 50 – 150 5 12 7 

200 – 300 8 15 7 

CB 26/ 50 – 80 5 12 7 1) 

CB 26 A 100 – 150 11 18 7 

200 – 300 18 25 7 

1 ) Valves should not be used for downward flow 

applications, since the spring will not close the 

valve flap. 

Y 

CB 14 

CB 24 S, CB 26, CB 26 A 

49 

A2

Swing Check Valves WB without spring, 

DN 50 – 300 mm, PN 10/16 

Ø D 

50 

Ø do 

L 

WB 26, WB 26A, WB 24 S 

DN 50 – 300 mm 

a 

Application 

WB 26 for liquids, gases and vapours 

WB 26 A for aggressive fluids 

WB 24 S for sea water 

Installation in horizontal or vertical lines with upward flow. 

Materials 

Type ASTM reference EN 1 ) equivalent 

WB 26 Body and flap AISI 420 1.4034 


Nominal pressure PN 16 

Design with O-rings 2) NBR 

Max. service pressure [bar] 16 

Related temperature [°C] 110 

Min. temperature 3) [°C] –10 

2) O-rings in flap and valve faces made of NBR as standard. 

3 ) Minimum temperature for nominal pressure rating. 

Weights and Dimensions 

galvanized galvanized 

WB 26 A Body AISI 316 1.4401 

Flap A 351 CF 8M 1.4408 

WB 24 S Body and flap Aluminium bronze Aluminium bronze 

O-rings NBR as standard 

1) Physical and chemical properties comply with ASTM grade. 

WB Design 


metal-to- NBR EPDM FPM PTFE without special 

metal (–30 up to (–40 up to (–25 up to (–25 up to spring spring 

110°C) 4) 150°C) 4) 200°C) 4) 200°C) 4) 

WB 24S O X Use CB 26 O – X – 

WB 26 O X Use CB 26 O Use CB 26 X – 

WB 26A O X Use CB 26A O Use CB 26A X – 

4) Observe pressure/temp. ratings 

X : standard 

O : optional 


Nominal size DN Dimensions [mm] Weight 5) 

[mm] [in] L ∅ D a ∅ do [kg] 

50 2 14 109 35 32 0.95 

65 2 1/2 14 129 48 40 1.2 

80 3 14 144 60 54 1.6 

100 4 18 164 78 70 2.5 

125 5 18 195 98 92 3.5 

150 6 20 220 116.5 112 4.7 

200 8 22 275 160 154 7.6 

250 10 26 330 200 200 13.2 

300 12 32 380 235 240 20.5 

5) The weight ratings apply for WB 26 and WB 26 A. WB 24 S reduced by approx. 5 %.

Swing Check Valves WB without spring, 

DN 50 – 300 mm, PN 10/16 


The curves given in the chart are valid for water at 20 °C. 

To read the pressure drop for other fluids the equivalent water volume 

flowrate must be calculated and used in the graph. 

The values indicated in the chart are applicable to valves with horizontal 

flow. With vertical flow insignificant deviations occur only within the range 

of partial openings. 

V · W = V · · 





1000 

/h] 


Opening pressure zero when valve is installed in 

horizontal line. 

51 

A2


DN 40 – 1000 mm, PN 10 – 100 

52 

A 

L 

NAF-Check 

DN 40 – 1000 


Ø D 

Application 

for liquids, gases, vapours, aggressive fluids and low temperatures. 

Weight and Dimensions 

Type PN 

526 620 1 ) 

526 630 2 ) 

528 620 1 ) 

528 630 2 ) 

526 520 1) 

528 530 2 ) 

528 520 1 ) 

528 530 2 ) 

1) without spring 

2 ) with spring 

Materials 

Design 

Steel 

Stainless 

steel 

10 – 40 

10 – 25 

Part 

designation 

Body 

Flap 

Body 

Nominal size 

DN [mm] 

Materials 

EN / ASME 

Equivalent 

40 – 50 eN 1.4404 ASMe SA 479M 316 L 

65 – 250 1.0619 – 

300 – 1000 eN 1.0619 ASTM A 216 WCC 

40 + 50 ASTM A487 Gr CA6NM 1.4435 

65 – 1000 eN 1.4317 SS 2387 

40 – 50 eN 1.4404 ASMe SA 479M 316 L 

65 – 1000 eN 1.4408 / CF 8M – 

Flap 40 – 1000 eN 1.4470 SS 2324 

Max. service pressure [bar] / related temperatures [°C] 

Design Type PN DN [mm] 

3 ) 

20 100 150 200 250 300 350 400 450 500 525 

Steel 

down to –10 °C at 

nominal pressure 

526 620 / 30 

526 520 / 30 

40 

25 

40 – 250 

300 – 1000 

36.4 

25.0 

31.1 

23.3 

28.1 

21.7 

25.8 

19.4 

24.0 

17.8 

22.6 

16.1 

21.3 

15.0 

– 

– 

– 

– 

– 

– 

– 

– 

Stainless steel 

down to –40 °C at 

nominal pressure 

528 620 / 30 

528 520 /30 

40 

25 

40 – 250 

300 – 1000 

36.4 

22.8 

31.1 

21.1 

28.1 

19.6 

25.8 

18.3 

24.0 

17.2 

– 

– 

– 

– 

– 

– 

– 

– 

– 

– 

– 

– 

3 ) Max. temperature rating for design with spring: + 300 °C. 

DN 

[mm] 

Dimensions [mm] Weight 

D L A [kg] 

40 84 33 15 1.2 

50 92 43 5 1.7 

65 108 46 12 1.7 

80 128 64 16 3 

100 158 64 26 5 

125 180 70 36 7 

150 203 76 51 9 

200 263 89 71 16 

250 315 114 90 28 

300 370 114 125 41 

350 432 127 146 48 

400 480 140 175 65 

450 530 152 188 94 

500 592 152 228 115 

600 692 178 282 192 

700 804 229 301 270 

800 911 241 374 402 

1000 1124 300 458 782


DN 40 – 1000 mm, PN 10 – 100 


The curves given in the chart are valid for water at 20 °C. 

To read the pressure drop for other fluids the equivalent water volume 

flowrate must be calculated and used in the graph. 

The values indicated in the chart are applicable to valves with horizontal 

flow. With vertical flow insignificant deviations occur only within the range 

of partial openings. 

The chart and flow characteristics are available up to and including PN 

40. Higher PN increase the zeta values and pressure drops at the same 

flowrates by approx. 20 %. 

The kvs values decrease accordingly. 

V · W = V · · 






1000 

, 

, 

, 

53 

A2

GESTRA Control Valves ZK 

54 

GESTRA Control Valves ZK with Radial Stage Nozzle: 

Our high-performance control valves with tight shut-off are 

based on extensive experience and know how acquired 

over many years in the design of valves for power plants. 

Low repair and maintenance requirements combined with 

hight resistance to wear guarantee reliable operation and a 

long service life.

A4 Return-Temperature Control Valves 

A4 Self-Acting Pressure and 

Temperature Controllers 

A4 Control Valves 

A6 Safety Valves 

A7 Strainers 

A8 Stop Valves 

Page 

Return-Temperature Control Valves 

Cooling-Water Control Valves CW GESTRAMAT.................................................................. 56 – 57 

Return-Temperature Control Valves BW KALORIMAT.......................................................... 58 – 60 

Self-Acting Pressure and Temperature Controllers 

Pressure-Reducing Valves 5801................................................................................................ 61 

Pressure-Maintaining Valves 5610 ............................................................................................ 62 

Self-Acting Temperature Controllers.................................................................................. 63 – 65 

Control Valves 

Single-Seat Control Valves with Electric 

or Pneumatic Actuator .............................................................................................................. 66 

Control Valves ZK with Radial Stage Nozzle ...................................................................... 67 – 70 

Safety Valves GSV.......................................................................................................................... 71 

Strainers GSF, SZ ................................................................................................................... 72 – 73 

Stop Valves GAV ............................................................................................................................ 74 

55 

A4-A8

Cooling Water Control Valves CW 

GESTRAMAT 

56 

L 

CW 44 

L 

CW 41 

MCW 41 

Features of the CW Series 

Direct acting proportional controller for regulating the cooling-water return temperature. 

Reduced capital costs (for new plants) coolant and energy consumption due to higher 

discharge temperatues 

The valve prevents short-circuiting and automatically balances large 

systems. 

Straight-through body with solid-state expansion thermostat and setting device. 

Standard valve type CW 41 with pressure gauge (0–6 bar) and thermometer 

(–30 to +100 °C). 

MCW 41 = CW 41 with diaphragm actuator. (Retro-fitting of diaphragm actuator possible). 

Application 

CW 41 

CW 44 

for industrial cooling water 

CW 41/4 for saline fluids, ammoniacal cooling water and chlorinated hydrocarbons 

CW 44 k 

(wetted internal parts made from stainless steel) 

MCW 41 for heavily contaminated cooling systems 

Specification*) 

Type PN 

∆PMX Material Pressure/Temperature 

[bar] EN ASTM PMA / TMA PMA / TMA 

CW 41 16 6 EN-JS 1049 – 1 ) 16 bar/–32 °C 16 bar/110 °C 2 ) 3 ) 

CW 41/4 16 6 EN-JS 1049 – 1) 16 bar/–32 °C 16 bar/110 °C 2) 3) 

CW 44 25 16 1.0460 A 105 1) 25 bar/–2 °C 25 bar/110 °C 2) 3) 

CW 44 k 25 16 1.0460 A 105 1 ) 25 bar/–37 °C 25 bar/85 °C 2 ) 3 ) 


Physical and chemical properties comply with EN. 

2 ) Temperature only admissible for a short time 

3 ) Admissible temperature depends on type of thermostat: 

type n (standard) 110 °C, type w (wax) 100 °C, type k (brine) 85 °C 

*) For more information on pressure/temperature ratings and end connections see data sheets. 

Temperature Ratings 

Type Thermostat/cone combination Adjustment range 

CW 41 wr or ws 20 °C – 60 °C 

CW 41/4 nr or ns 3 °C – 100 °C 

w = wax thermostat 

n = standard thermostat 

k = thermostat for brine 

kr or ks –32 °C – 74 °C 

CW 44 n –2 °C – 106 °C 

CW 44 k k –37 °C – 71 °C 

r = reduced cone for 

small flowrates 

s = standard cone for 

large flowrates

Cooling-Water Control Valves CW 

GESTRAMAT 

End Connections and Overall Lengths 

Overall length L [mm] 

Type End connection DN 10 DN 15 DN 20 DN 25 DN 40 DN 50 DN 80 DN 100 

Flowrates (k v values) 

Type Cone DN 25 DN 40, DN 50 DN 80, DN 100 

CW 41 

r 

Kvs value [m3 /h] 2.1 6.5 20 

CW 41/4 Kvo (Preset bleed flow) [m3 /h] 0.12 0.31 1.0 

s 

3 /8 " 1 /2 " 3 /4 " 1" 1 1 / 2 " 2" 3" 4" 

CW 41 Flanged EN PN 16 – – – 160 200 230 310 350 

CW 41/4 Flanged EN PN 16 – – – 160 200 230 310 350 

CW 44 Screwed sockets 95 95 95 95 – – – – 

CW 44 k Screwed sockets 95 95 95 95 – – – – 

Kvs value [m 3 /h] 10.5 31 98 

Kvo (Preset bleed flow) [m 3/h] 0.55 1.5 5.0 

G 3/ 8 G 1/ 2 G 3/ 4 G 1 

CW 44 – Kvs value [m 3/h] 0.66 0.66 1.37 1.37 

CW 44 k – Kvo (Preset bleed flow) [m 3 /h] ] 0.04 0.04 0.04 0.04 

57 

A4-A8

Return-Temperature Control Valves BW 

KALORIMAT 

58 

L 

BW 31, DN 15–25 mm 

External setting device 

for BW 31 

Setting device 

for BW 31A 

Features of the BW series 

Direct acting proportional controller for maintaining constant return temperatures. 

Used for regulating large heating systems and tracing systems, or for the temperature control 

of individual heat exchangers (washing baths, chemical and galvanic baths). 

Straight-through valve with balanced valve sleeve. Closing temperature set at 

our works. 

Valves with external setting device available on request. 

Also suitable for a supply system tailored to the needs of consumers that are installed in 

parallel 

Application 

BW 31 for hot water 

BW 31 A for thermal oils 

Specification*) 

Type 

DN 

[mm] 

PN ∆PMX 

[bar] 

EN 

Materials 

ASTM 

Pressure / Temperature 

PMA / TMA PMA / TMA 

BW 31 15-25 40 6 1.0460 A 105 1 ) 37.3 bar/100 °C 23.1 bar/400 °C 

BW 31 40 25 6 1.0460 A 105 1) 23.3 bar/100 °C 14.4 bar/400 °C 

BW 31A 15-25 40 6 1.0460 A 105 1 ) 30.2 bar/200 °C 23.1 bar/400 °C 

BW 31A 40 25 6 1.0460 A 105 1 ) 19.4 bar/200 °C 14.4 bar/400 °C 

1) ASTM neares equivalent is statet for guidance only. 

Physical and chemical properties comply with EN. 


End Connections and Overall Lengths L 

Type 

Connections 

Overall length L [mm] 

DN 15 DN 20 DN 25 DN 40 

1/ 2 " 3/ 4 " 1" 1 1/ 2 " 

BW 31 Flanged EN PN 25 150 150 160 200 

Flanged ASME 150 150 150 160 200 

Screwed sockets 95 95 95 – 

BW 31A Flanged EN PN 25 150 150 160 200 

Flanged ASME 150 150 150 160 200 

Screwed sockets 95 95 95 – 

Adjustable closing temperatures (without external setting device) 

Adjustable 

range 

DN 15 mm DN 20 mm DN 25 mm DN 40 mm 

Type 1/ 2 " 3/ 4 " 1" 1 1/ 2 " 

BW 31 60 °C - 130 °C 40 °C - 115 °C 40 °C - 115 °C 50 °C - 110 °C 

BW 31A 120 °C - 270 °C 100 °C - 280 °C 100 °C - 280 °C 100 °C - 270 °C 

Adjustable closing temperatures (with external setting device) 

BW 31 60 °C - 130 °C 40 °C - 115 °C 40 °C - 115 °C 50 °C - 110 °C 

BW 31A 90 °C - 270 °C 70 °C - 270 °C 70 °C - 270 °C 70 °C - 270 °C


KALORIMAT 


∆t = temperature difference in Kelvin [K] between closing temperature 

(temperature at which the valve is closed) and return temperature. 

BW 31, DN 15 BW 31, DN 20 and 25 

Durchsatz 

Capacity 

BW 31, DN 40 

Durchsatz 

Capacity 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

50000 

20000 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 

20 

10 

8 

6 

5 

25000 

20000 

10000 

8000 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 

∆P 

Fühlstrommenge bei geschlossenem Regler 

0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

∆P 

Bleed flowrate when controller is closed 


0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

2 3 4 5 6 8 10 20 30 40 50 60 80 100 


2 3 4 5 6 8 10 20 30 40 50 60 80 100 

∆ t = 35 K 

∆ t = 30 K 

∆ t = 25 K 

∆ t = 20 K 

∆ t = 15 K 

∆ t = 10 K 

∆ t = 5 K 

∆ t = 0 K 

∆ t = 30 K 

∆ t = 25 K 

∆ t = 20 K 

∆ t = 15 K 

∆ t = 10 K 

∆ t = 5 K 

∆ t = 0 K 

Durchsatz 

Capacity 

20000 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

10000 

8000 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 

20 


0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

∆P 


2 3 4 5 6 8 10 20 30 40 50 60 80 100 

∆ t = 40 K 

∆ t = 30 K 

∆ t = 20 K 

∆ t = 15 K 

∆ t = 10 K 

∆ t = 5 K 

∆ t = 0 K 

59 

A4-A8


KALORIMAT 


∆t = temperature difference in Kelvin [K] between closing temperature 

(temperature at which the valve is closed) and return temperature. 

BW 31A, DN 15 

Durchsatz 

Capacity 

Durchsatz 

Capacity 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

50000 

20000 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

60 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 

20 

10 

8 

6 

5 

BW 31A, DN 40 

25000 

20000 

10000 

8000 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 


0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

∆P 


0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

∆P 


2 3 4 5 6 8 10 20 30 40 50 60 80 100 


2 3 4 5 6 8 10 20 30 40 50 60 80 100 

∆ t = 70 K 

∆ t = 60 K 

∆ t = 50 K 

∆ t = 35 K 

∆ t = 30 K 

∆ t = 20 K 

∆ t = 10 K 

∆ t = 0 K 

∆ t = 85 K 

∆ t = 70 K 

∆ t = 60 K 

∆ t = 50 K 

∆ t = 40 K 

∆ t = 30 K 

∆ t = 20 K 

∆ t = 15 K 

∆ t = 10 K 

∆ t = 5 K 

∆ t = 0 K 

BW 31A, DN 20 and 25 

Durchsatz 

Capacity 

20000 

10000 

8000 

6000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

10000 

8000 

6000 

5000 

4000 

3000 

2000 

1000 

800 

600 

500 

400 

300 

200 

100 

80 

60 

50 

40 

30 

20 


0,1 0,2 0,3 0,4 0,6 0,8 1 2 3 4 5 6 

∆P 


2 3 4 5 6 8 10 20 30 40 50 60 80 100 

∆ t = 65 K 

∆ t = 50 K 

∆ t = 35 K 

∆ t = 25 K 

∆ t = 15 K 

∆ t = 10 K 

∆ t = 5 K 

∆ t = 0 K

Self-Acting Pressure Control 

Pressure Reducing Valve 5801 

∅ d 

G 1/ 8" 

Strainer 

Pressure-reducing valve 5801 

G 3/ 8" 

L 

∅ A 

l 

Water-seal pot 

Pessure-reducing valve 

min. 1m 

min. 10 x D 

Schematic installation diagram 

H 

h 1 

17.2 x 2.6 


Sensing line 

8 x 1.0 mm 

Sensing line 

connection 

Application 

Type 5801 Pressure-reducing valve for use with steam and other fluids. 

In all energy and process systems. 

Design 

The pressure-reducing valve is a balanced single-seat proportional controller 

operating without auxiliary energy. 

The pressure-reducing valve consists of a body with internals, bellows, spring, handwheel and 

actuator. For steam and liquids at temperatures above 100 °C 

a water-seal pot is required to protect the actuator diaphragm. 

Dimensions [mm] and Weights [kg] of Valve Body 

DN 15 20 25 32 40 50 65 80 100 125 150 200 

L 130 150 160 180 200 230 290 310 350 400 480 600 

H 390 390 390 408 425 500 505 590 590 705 725 760 

Weight 0.7043 7 8 9 12 14 18 26 40 50 77 112 170 

Weight 1.0619 

Weight 1.4581 

Dimensions [mm] and Weights [kg] of Water Pot Seal 

Schematic Representation 

of a Compact-Design 

Pressure Reducing Station 

4 

9 9 

5 

1 Pressure-reducing valve 5801 

2 Steam drier and purifier TD 

3 Float trap UNA 

4 Safety valve GSV 

5, 6, 7 Isolating valves GAV 

8 Strainer GSF 

9 Pressure gauge 

7 8 9 12 14 19 27 40 54 82 115 176 

Dimensions [mm] and Weights [kg] of Actuator 

Actuator A11 A2 A3 A4 A51 A61 B11 B2 

∅ A 150 160 195 270 355 510 150 160 

h 1 90 100 100 120 165 200 90 110 

Approx. weight 2.8 4.5 6.0 4.5 10 27.5 3.5 5.5 

Size l d Size DN Weight 

1 206 88.9 15 – 65 1.7 

2 172 152.4 80 – 100 3.5 

3 250 152.4 125 – 200 4.9 

8 

2 

3 

7 

1 

6 

61 

A4-A8

Self-Acting Pressure Control 

Pressure-Maintaining Valve 5610 

Strainer 

62 

G 1/ 8 " 

∅ d 

G 3/ 8" 

l 


min. 1m 

Waterseal 

pot 

Sensing 

line connection 

Sensing line 

8 x 1.0 mm 

L 

∅ A 

Pressure-maintaining valve 5610 

Schematic installation diagram 

H 

h 1 

17.2 x 2.6 

Pressure-maintaining valve 

Application 

Type 5610 Pressure-maintaining valve for maintaining upstream pressures independent of 

downstream pressures for use with steam, gases and liquids. 

Design 

The pressure-maintaining valve is a self-acting proportional controller with single-seat and 

balanced valve. 

The pressure-maintaining valve consists of a body with internals, bellows, spring, handwheel 

and actuator. For steam and liquids at temperatures above 100 °C a water-seal pot is required to 

protect the actuator diaphragm. 

Dimensions [mm] and Weights [kg] of Valve Body 

DN 15 20 25 32 40 50 65 80 100 

L 130 150 160 180 200 230 290 310 350 

H 405 405 405 410 425 495 500 590 590 

Approx. weight 10 11 12 14 18 23 35 48 70 

Dimensions [mm] and Weights [kg] of Actuator 

Actuator A11 A2 A3 A4 A51 B11 B2 

∅ A 150 160 195 270 355 150 160 

h 1 90 100 100 120 165 90 110 

Approx. weight 2.8 4.5 6.0 4.5 10 3.5 5.5 

Dimensions [mm] and Weights [kg] of Water-Seal Pot 

Size l d Size DN Weight 

1 206 88.9 15 – 65 1.7 

2 172 152.4 80 – 100 4.9 

Diagrammatic layout of 

pressure-maintaining 

control unit with 

flash-vessel

Self-Acting Temperature Controllers 

System Clorius 

Thermostat 

Valve 

Sensor 

Application 

Temperature control in heating and 

cooling processes in industrial plants, for 

h.v.a.c services and marine engineering. 

For liquids, gases, vapours. 

Design 

The self-acting temperature controller consists 

of a valve featuring a thermostat and a 

sensor. According to the service conditions 

the controller is optionally equipped with 

a cooling unit, a sensor pocket or a safety 

thermostat. 

The temperature sensed by the sensor 

changes the volume of the measuring liquid 

in the capillary tube. The resulting pressure 

acts directly on the actuating piston which, 

in turn, operates the valve spindle. As the 

temperature rises, the regulating valve is held 

in closed positon (heating process) or open 

position (cooling process) until the pre-set 

release temperature is reached. 

When the temperature drops again, a builtin 

return spring resets the valve to original 

position. 

Valves 

Examples of Industrial Process Applications 

Heating steam 

Two-way valve 

with safety thermostat 

Two-way valves, with single seat or 

pressure-balanced single/double seat. 

Double-seated, two-way reverse-acting 

valves or three-way valves for diverting and 

mixing applications. Valve components made 

of gunmetal, cast iron, nodular cast iron or 

cast steel, with flanged or screwed connections. 

Thermostat 

The thermostat is firmly attached to the 

sensor capillary tube. The rod-, spiral- or 

airduct-type sensors are made of copper or 

high-alloy stainless steel. 

The capillary tube is available in different 

lengths, made of copper, high-alloy stainless 

steel or with PVC coating. 

Special designs: 

“Duostat” double-thermostat with 

two sensors 

Safety thermostat SH 4S. 

Heat exchanger with constant flow-temperature of the secondary circuit controlled on the steam side 

Inlet 

Condensate 

Cooler 

Hot water 

return 

Cooling-water return control for constant cooling-water return temperatures 

Hot water supply 

Cooling water return 

Outlet 

63 

A4-A8



Dimensions [mm] and Weights [kg] for Valves and Thermostats 

Valve type DN 15 20 25 32 40 50 65 80 100 125 150 

M1F 

G1F 

H1F 

M1FB 

G1FB 

H1FB 

L 1 S 

L 2 S 

L2SR 

H 1 

H 

M2FR 

G2FR 

H2FR 

30 E 

64 

C 

L 

G1 

L 

G1 

L 

L 

L 

G1 

G1 

L 

H H 1 

B 

H 1 

H 2 

H 1 

H 

H 1 

H 

H 1 

H 2 

A 

G 

D 

F 

H 

G ½ ¾ 1 1¼ 1½ 2 

L 130 150 160 180 200 230 

H 1 80 85 95 105 110 125 

H 2 60 65 70 75 85 95 

M1F/G1F kg 3.1 4.2 5.5 8.1 9.7 14.7 

H1F kg 3.4 4.6 6.1 9.0 10.8 15.5 

L 160 180 200 230 290 310 

H 180 195 205 225 260 275 

H 1 70 75 85 95 110 115 

M1FB kg 6.0 9.0 13.0 16.0 23.0 38.0 

G1FB kg 6.0 9.0 13.0 16.0 

H1FB kg 6.0 9.0 13.0 16.0 23.0 38.0 

L 75 87 99 

H 65 67 67 

H 1 20 23 25 

kg 0.7 0.8 1.1 

L 90 100 113 129 153 

H 82 80 82 118 122 

H 1 48 53 58 68 71 

kg 1 1 1.6 2.9 3.8 

L 75 87 99 113 129 153 

H 43 45 50 55 65 70 

H 1 80 80 80 80 90 94 

kg 1.0 1.0 1.0 1.5 3.0 4.0 

L 150 160 180 200 230 290 310 350 400 400 

H 1 63 70 75 85 95 110 155 145 160 180 

H 2 112 117 151 155 163 180 195 240 260 293 

kg 5.0 6.5 9.0 11.0 16.0 21.0 35.0 39.0 75.0 77.0 

Thermostats Type V 2.05 Type V 4.03 Type V 4.05 Type V 4.10 Type V 8.09 Type V 8.18 

K = sensor of copper 

N = sensor of high alloy S.S. K N K N K N K N K N K N 

Adjusting cylinder A 305 305 385 385 385 385 385 385 560 560 560 

B 405 405 525 525 525 525 525 525 740 740 740 

Rod- and spiral-type C 210 190 210 190 390 380 490 515 710 745 800 

sensor with BSP connection D 235 170 235 170 235 250 325 325 425 435 810 

E 22 22 22 22 22 22 28 25 28 25 34 

F 49 49 49 49 49 49 49 49 49 49 49 

G 

3/ 4 

3/ 4 1 1 1 1 1 1 2 2 2 

H 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 2" 

kg 1.8 1.8 2.4 2.4 2.6 2.6 3.3 3.3 6.3 6.3 7.3 

kg 2.3 2.3 2.9 2.9 3.1 3.1 3.8 3.8 6.3 6.3 7.3 

1" 

27 

275 

50 

100 

50 

Safety temperature limiter 

SH 4 S 

310



Closing Pressure Ratings for Valves and Sensors 

Single-seated regulating valves with flanged ends and rod-type copper sensor with copper capillary tube (3 m) 

DN [mm] 15/6 15/9 15/12 15 20 25 32 40 50 65 80 

k vs value 0.45 0.95 1.7 2.75 5 7.5 12.5 20 30 50 80 

∆p max for sensor type 2.05 21 13 9.3 5.3 1.9 0.9 – – – 

Fluid: saturated steam 4.05 40 38 24 15 6.7 – – – – 

Type M1F, G1F, H1F 4.10 – – – – – 4.1 1.9 0.8 – 

8.09 – – – – 16 10 5.8 3.5 2.3 

Balanced, single-seated regulating valves with flanged ends and rod-type copper sensor with copper capillary tube (3 m) 

DN [mm] 15/6 15/9 15/12 15 20 25 32 40 50 65 80 

k vs value 0.45 0.95 1.7 2.75 5 7.5 12.5 20 30 50 80 

∆p max for sensor type 4.05 15 – – – – – 

Fluid: saturated steam 4.10 – 12 8.1 5.7 – – 

Type M1FB, G1FB, H1FB 8.09 – 14 11 8.7 6.4 – 

8.18 – – – – – 4.3 

Single-seated regulating valves with screwed end connection and rod-type copper sensor capillary tube (3 m) 

BSP 1/ 2 / 6 1/ 2 / 9 1/ 2 / 12 1/ 2 

k vs value 0.45 0.95 1.7 2.75 5 7.5 

∆p max for sensor type 2.05 16 11 – 4.9 2.4 – 

Fluid: saturated steam 4.05 16 16 – 13 7.7 – 

Type L 1S 4.10 – – – – – 4.7 

Double-seated regulating valves with screwed connection and rod-type copper sensor with copper capillary tube (3 m) 

BSP 1/ 2 / 6 1/ 2 / 9 1/ 2 / 12 1/ 2 

Double-seated reverse-acting valve with screwed connection and rod-type copper sensor with copper capillary tube (3 m) 

BSP 

1 /2 

Three-way valves available on request. 

3 /4 1 1 1 / 4 1 1 / 2 2 

k vs value 2.75 5 7.5 12.5 20 30 

∆p max for sensor type 2.05 15 11 7.1 4.6 – – 

Fluid: water < 120 °C 4.05 15 11 7.1 4.6 – – 

Type L2SR 4.10 – – – – 2.7 1.8 

Double-seated reverse-acting valve with flanged ends and rod-type copper sensor with copper capillary tube (3 m) 

DN [mm] 20 25 32 40 50 65 80 100 125 150 

k vs value 5 7.5 12.5 20 30 50 80 125 215 310 

∆p max for sensor type 2.05 8.3 8 – – – – – – – – 

Fluid: water < 120 °C 4.05 8.3 8 7 – – – – – – – 

Tye M2FR, G2FR, H2FR 4.10 – – – 6.6 5.3 10 6.7 – – – 

3/ 4 

8.09 – – – – – – – 12.1 – – 

8.10 – – – – – – – 12.1 9 7.5 

1 

3/ 4 1 1 1/ 4 1 1/ 2 2 

k vs value 0.45 0.95 1.7 2.75 5 7.5 12.5 20 30 

∆p max for sensor type 2.05 – – – – – – 7.8 – – 

Fluid: water < 120 °C Type L 2S 4.10 – – – – 40 40 25 21 14 

65 

A4-A8

Control Valves with Electric and 

Pneumatic Actuators 

H 1 

H 2 

66 

L 

∅ D 

L 

Applications 

Type V 725 Control of liquids, gases and steam up to 250 °C. 

Ultra-compact pneumatic design thanks to directly 

attached positioner. 

Max. Differential Pressure Ratings [bar] for Actuator Sizing 

k vs 2 ) 

(m 3/h) 

1 

DN 

[mm] 

Lift 

[mm] 

IP-127 

FS 1 ) 

Dimensions [mm] and Weights [kg] 

Pneumatic actuator Electric actuator 

IP-252 

FS 1 ) 

DN 15 20 25 32 40 50 65 80 100 

∅ D Lift 20 mm Lift 40 mm 

Length L 130 150 160 180 200 230 290 310 350 

H 1 IP-127 198 355 355 355 356 356 361 – – – 

IP-252 265 362 362 362 363 363 368 – – – 

IP-502 352 – – – – – – 536 536 539 

IP-700 405 – – – – – – 647 647 650 

H 2 AP-102 177 508 508 508 525 525 578 – – – 

AP-204 177 508 508 508 525 525 578 631 631 635 

AP-208 177 – – – – – – 669 669 673 

Weight IP-127 13 13 15 18 20 24 – – – 

IP-502 

FS 1 ) 

IP-700 

FS 1 ) 

AP-102 AP-204 AP-208 

40 40 40 40 

1.6 40 40 40 40 

15, 20, 25 

2.5 40 40 40 40 

4 40 40 40 40 

5.6 15 40 40 40 40 

6.3 20, 25, 32 40 40 40 40 

8 20 40 40 40 40 

10 25, 32, 40 20 40 40 40 40 

14 25 35 40 32 40 

16 32, 40, 50 35 40 32 40 

22.4 32 17 40 15 40 

25 40, 50 17 40 15 40 

31.5 40 12 31 10 30 

40 50 10 28 9 27 

47.5 50 6 19 6 18 

40 65 

40 40 27 40 

63 65,80 38 40 16 32 

80 65 23 34 9 19 

100 80, 100 40 

23 34 9 19 

125 80 15 23 6 13 

160 100 14 21 5 11 

180 100 9 14 3 8 

Pneumatic actuators with spring range 2.0 – 4.8 bar. Other ranges on request. 

Max. differential pressure for control valves with PTFE rings. 

1 ) Standard version “spring to close”, “spring to open” available on request. 

2) K vs value 0.16/0.25/0.4 and 0.63 m 3/h on request. 

IP-252 17 18 19 23 24 28 – – – 

IP-502 – – – – – – 57 65 79 

IP-700 – – – – – – 72 77 93 

AP-102 10 11 12 15 17 21 – – – 

AP-204 10 11 12 16 17 22 37 44 58 

AP-208 – – – – – – 39 46 60

Control Valves ZK 

with Radial Stage Nozzle 

ZK 29/14 DN 50 with lift restriction (optional extra) 

Radial stage nozzle with tandem shut-off 

for ZK 213 

Application 

For the decrease of high pressure drops in 

industrial plants and power stations as: 

Level control valve 

Warm-up valve 

Level control valve 

Injection cooling valve 

Feedwater control valve 

Leak-off valve 

Start-up pot drain valve 

And more applications 

Materials 

Features 

Extremely wear resistant 

Excellent sealing and control 

characteristic (EN 12266-1 leakage rate A) 

Variable valve characteristics 

(linear and equal-percentage) 

Easy assembly and inspection 

of nozzle insert 

Tandem shut-off for 

ZK 313 and ZK 213 

Low sound level 

Type Body 1 ) 

Different actuators available 

ZK 29, DN 25, 50 13 CrMo 4 4 (1.7335) 

ZK 29, DN 80, 100, 150 GS-17 CrMo 5 5 (1.7357) 

ZK 210 13 CrMo 4 4 (1.7335) 

ZK 313 16 Mo 3 (1.5415) 

A182 F1 (1.5423) 

10 CrMo 9 10 (1.7383)/A182 F22 

X 10 CrMo VNb 9 1 (1.4903)/A182 F91 

(P 91) 

ZK 213 16 Mo 3 (1.5415) 

WB 36 (1.6368) 

1) Butt-weld ends of other material by welding of pipe ends possible. 

Actuators 

Type ZK 29 ZK 210 ZK 313 ZK 213 

Handwheel – – 

ZK 610 

ZK 613 

Electric rotary actuator 

Electric linear actuator 

Electro-hydraulic linear actuator – – 

Pneumatic actuator – 

Part-turn actuator – 

Controls 

Complete PLC-based controls for applications 

such as injection booler, leak-off valve etc. 

designed and manufactured according to 

customers' specifications. 

67 

A4-A8



Technical Data 

K vs -values [m 3/h] (linear characteristics), design, pressure/temperature ratings 

ZK 29 

25 0.7 1.4 2.1 

50 

65 

3 6 9 

80 14 21 28 

100 

125 

20 33 46 

150 

200 

250 

300 

350 

400 

70 100 130 

Durchgang / Eck 

ZK 210 

DN ∆ p 100 bar ∆ p 180 bar 

68 

ZK Straight-through 210 / angle 

ZK 412 

p [bar] 

DN ∆ p 100 bar ∆ p 180 bar Absperrventil 

25 0.8 1.5 2.3 0.5 

25 1 1.5 2 0.5 13 

50 3.3 6.5 10 2 

50 4 6 8 2 16 

65 

65 

ZK 80 313 9.5 18 28 5 

80 ZK 513 

DN 100 ∆ p 300 bar 

∆ p DN 100 ∆ p 560 bar 

125 t 

150 

370 bar 125 

Bg. 

150 

1 3 

25 

200 

1 1,5 9,5 

200 

25 

50 

250 

1 

250 

50 3 5 

65 

300 

1 1,5 

300 

65 3 5 9 

80 

350 

11 9,5 

350 

80 3 5 9 12 

100 

400 

11 14,5 17 9,5 100 

400 

5 9 12 t 20 [°C] 

125 Durchgang / Eck 

150 

11 14,5 17 9,5 Durchgang 125 / 9Eck 12 

150 

30 

200 

200 

250 ZK 213 sizes 1-5 

250 Angle / Z pattern 

DN 300 ∆ p 300 bar ∆ p 560 bar 300 

350 

Bg. 

400 

1 2 3 4 5 1 2 3 4 5 

350 

400 

25 


50 

65 

Eck Eck 

80 13 10 

100 13 26 10 20 

125 13 26 39 10 20 30 

150 26 39 60 20 30 46 

200 39 60 90 30 46 70 

250 60 90 46 70 

300 

350 

90 70 

400 

Eck / Z-Form 

Nennweitenanpassung Adaptation of nominal sizes ist möglich is ö possible 

t [°C] 

p [bar] 

p [bar] 

p [bar] 

p [bar] 

DN ∆ p 100 bar 

DN ∆ p 100 bar ∆ p 180 bar 

25 0.8 1.5 2.3 0.5 

50 

65 

3.3 6.5 10 2 

80 

100 

125 

150 

200 

250 

300 

350 

9.5 18 28 5 

400 

t [°C] 


Straight-through / angle 

2 

p [bar] 

p [bar] p [bar] 

p [bar] p [bar] 

ZK 412 

DN ∆ p 100 bar ∆ p 180 bar Absperrventil 

25 1 1.5 2 0.5 13 

50 

65 

80 

100 

125 

150 

200 

250 

300 

350 

400 

4 6 8 2 16 


p [bar] 

DN 

ZK 213 

Bg. 

∆ p 300 bar 

∆ p 560 bar 

1 2 3 4 5 1 2 3 4 5 

25 

50 

65 

80 13 10 

100 13 26 10 20 

125 13 26 39 10 20 30 

150 26 39 60 20 30 46 

200 39 60 90 30 46 70 

250 60 90 46 70 

300 

350 

400 

90 70 

Eck / Z-Form 

p [bar]




K vs -values [m 3/h] (linear characteristics), design, pressure/temperature ratings 

ZK 313 

DN 

25 

50 

65 

80 

100 

125 

150 

200 

250 

300 

350 

400 

∆ p 300 bar 

1 

1 

1 

1.5 

1.5 

1.5 

2.3 

2.3 

2.3 

3.6 

3.6 

3.6 

5.5 

5.5 

5.5 

Throttle variants ZK 313 

Standard throttle ∆p max 300 bar 

8 

8 

8 

11 

11 

11 

11 

11 

11 

14.5 

14.5 

14.5 

13 

13 

13 

17 

17 

17 

∆ p 370 bar 

4.5 

4.5 

4.5 

4.5 

4.5 

4.5 

9.5 

9.5 

9.5 

9.5 

9.5 

9.5 

Straight-through / angle DN 25 – 65 Angle / Z pattern up to DN 80 

p [bar] 

750 

600 

450 

300 

150 

1.7383 

1.5415 

1.4903 

0 

0 100 200 300 400 500 600 650 

t [°C] 

Special throttle ∆p max 370 bar 

(only angle-type) 

69 

A4-A8

Control Valves ZK with Radial Stage Nozzle 

ZK Range 600 

70 

2-stage expansion with balanced pressure 

for ZK 613 

Throttling unit A1/ A2 

with 4-stage expansion 

Application 

For large flowrates; 

used as 


Heating steam valve 

Start-up vessel drain valve 

Features 

Excellent sealing and control 

characteristics 


Max. k vs values [m 3 /h], designs, pressure/temperature ratings 

ZK 610/ZK 613 Angle / Z pattern 

DN 

∆p (bar) 

40 

1-stage 

ZK 610 Angle / Z pattern 

ZK 613 Angle / Z pattern 

80 

2-stage 

Extremely wear resistant 

Valve designed on modular 

assembly principle 

Low sound level 

Easy assembly and inspection 

of nozzle insert 

Variable valve characteristics 

(linear and equal-percentage) 

k vs range from 18 to 969 m 3/h 

Leakage-free pressure-balanced 

design 

120 

3-stage 

150 

4-stage 

> 150 

5-stage 

100 44 – 98 38 – 54 33 – 47 14 – 19 13 – 18 

125 71 – 154 61 – 85 51 – 74 22 – 31 20 – 29 

150 112 – 243 95 – 134 81 – 117 35 – 48 32 – 46 

200 177 – 385 150 – 212 128 – 185 55 – 76 50 – 73 

250 281 – 611 238 – 336 216 – 294 86 – 121 78 – 116 

300 446 – 969 378 – 533 322 – 465 137 – 191 125 – 184 

p [bar] 

p [bar] 

600 

480 

360 

240 

120 

600 

480 

360 

240 

120 

0 0 100 200 300 400 500 600 

t [°C] 

0 0 100 200 300 400 500 600 

t [°C] 

1.5415 

1.5415 

1.7380 

1.7380

Safety Valves GSV 

▼ 

▼ 

X 

H 

l 1 

∅ D2 DN2 ∅ d 0 

DN 1 

∅ D1 l 

Safety valve GSV 

Application 

For use with steam, liquids, and non-corrosive gases and vapours. 


DN 1 x DN 2 20 x 32 25 x 40 32 x 50 40 x 65 50 x 80 65 x100 80 x125 100 x150 125x200 150x250 

d 0 18 23 29 37 46 60 74 92 98 125 

l 95 100 110 115 120 140 160 180 200 225 

l 1 85 105 115 140 150 170 195 220 250 285 

H 1 ) 215 233 325 366 413 526 603 660 660 735 

H 2) – 234 331 372 419 529 606 663 663 735 

X 150 150 200 250 300 350 400 450 450 450 

Weight 9 9 12 16 22 32 56 75 85 131 

1 ) 4421, 4425, 4422 2 ) 4414 

Discharge Capacities for Saturated Steam [kg/h] 

Set 

pressure 

[bar] 

DN 20 DN 25 DN 32 DN 40 DN 50 DN 65 DN 80 DN100 DN125 DN150 

0.2 85 139 222 361 558 949 1444 2232 2532 4120 

0.5 134 219 348 566 875 1489 2265 3502 3973 6464 

1.0 198 324 515 839 1296 2205 3355 5185 5883 9572 

2.0 317 517 822 1339 2069 3520 5355 8277 9392 15280 

3.0 427 697 1108 1804 2788 4744 7216 11153 12655 20589 

4.0 533 870 1382 2250 3478 5918 9002 13913 15787 25685 

5.0 638 1041 1656 2695 4165 7087 10780 16662 18906 30758 

6.0 743 1213 1928 3138 4850 8252 12552 19401 22014 35815 

7.0 845 1380 2193 3570 5518 9388 14281 22073 25046 40748 

8.0 949 1550 2464 4010 6198 10545 16041 24794 28133 45770 

9.0 1053 1719 2733 4450 6878 11701 17799 27510 31216 50786 

10.0 1157 1889 3003 4889 7556 12856 19555 30225 34296 55797 

12.0 1365 2228 3542 5766 8913 15163 23065 35650 40452 65812 

14.0 1568 2560 4070 6625 10241 17423 26502 40962 46479 75619 

16.0 1775 2898 4608 7501 11594 19725 30004 46376 52622 85612 

18.0 1983 3237 5147 8378 12949 22030 33510 51795 58772 95617 

20.0 2191 3577 5686 9256 14306 24339 37023 57224 64932 105639 

22.0 2392 3906 6209 10107 15623 26579 40430 62491 70907 115361 

24.0 2600 4246 6750 10987 16982 28892 43948 67928 77078 125399 

26.0 2809 4586 7291 11869 18345 31211 47475 73380 – – 

28.0 3018 4928 7835 12753 19712 33537 51013 78848 – – 

30.0 3228 5271 8379 13640 21083 35869 54561 84333 – – 

32.0 3439 5615 8926 14530 22459 38210 58121 89835 – – 

Calculation according to DIN 3320 and AD Bulletin A2, TRD 421. 

For discharge capacities for other set pressure ratings or fluids see data sheet. 

71 

A4-A8

Strainers GSF 

H 

H 1 

H 

H 1 

72 

B 

S ∅ 

Strainer series 300 and 310 

with flanged connections 

Y-type strainer with 

screwed connections series 330 

L 

L 

DN 

Application 

In piping systems upstream of equipment that is sensitive to dirt. For liquids, gases, steam and 

aggressive fluids. 


for Y-Type Strainers with Flanged Connections PN 6 - 40 

Nominal size DN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 

Overall length L 130 150 160 180 200 230 290 310 350 400 480 600 730 850 

Overall height GSF 301, 303, 321, 322 H 103 120 140 150 190 215 315 355 435 475 548 660 880 1100 

Overall height GSF 312, 319, 320 H 118 125 130 146 168 177 330 340 410 516 600 790 940 1050 

Overall height GSF 301, 303, 321, 322 H 1 60 72 83 91 113 128 185 205 265 285 326 405 515 610 

Overall height GSF 312, 319, 320 H 1 81 85 100 100 120 133 200 210 250 313 362 475 530 640 

Screen ∅ GSF 301, 303, 321, 322 S 20 25 29 38 50 60 65 80 95 110 131.5 180 255.5 307.5 

Screen ∅ GSF 312, 319, 320 S 19 25 29 37 45 55 70 85 105 130 157 207 255.5 280 

Screen length GSF 301, 303, 321, 322 B 52 62 74 77 97 112 172 193 222 243 287 332 510 620 

Screen length GSF 312, 319, 320 B 52 56 57 67 95 102 178.5 182.5 226.5 286.5 339.5 454.5 510 

Mesh size 0.6 0.6 0.6 0.6 0.6 0.6 1.2 1.2 1.2 1.2 1.5 1.5 1.5 1.5 

Weight GSF 303 1.9 2.8 3.5 5.4 6.9 9.6 15.7 21.8 33.5 44.8 63.8 121 171 250 

Weight GSF 322 1.9 2.8 3.5 5.4 6.9 9.6 15.7 21.8 34 47.3 69.2 121 195 280 

Weight GSF 319 2.6 3.8 4.7 6.5 8.3 11.8 16.1 22 28 46 65.2 125 156 275 

Plug without plug G 1 / 2 G 1 

Weight GSF 312, 320 2.6 3.8 4.7 6.5 8.3 11.8 16.1 22.5 30.3 48 70 134.2 178 385 

Weight GSF 301 1.5 2.2 2.8 4 5.5 6.9 13.3 20.2 30.1 41.2 60.3 106 165 243 

Application 

In piping systems upstream of equipment that is sensitive to dirt. For liquids, gases, steam and 

aggressive fluids. 


of Y-Type Strainers with Screwed Connections 

Nominal size G 3 /8 

1 /2 

3 /4 10 1 1 / 4 1 1 / 2 20 

Overall height GSF 331 L 80 80 95 100 120 140 180 

Overall height GSF 332, 333, 335, 337 L 65 65 75 90 110 120 150 

Overall height GSF 334, 338 L 100 100 135 135 150 150 200 

Overall height GSF 331 H 1 50 50 63 66 73 86 97 

Overall height GSF 331 H 75 75 93 111 118 141 157 

Overall height GSF 332, 333, 335, 337 H 1 48 48 58 70 80 85 105 

Overall height GSF 332, 333, 335, 337 H 78 78 95 112 130 140 165 

Overall height GSF 334, 338 H 1 60 60 85 85 95 95 115 

Overall height GSF 334, 338 H 95 95 140 140 155 155 175 

Mesh size 0,5 0.5 0.5 0.5 0.5 0.5 0.5 

Weight GSF 331 0.45 0.45 0.6 1.1 1.4 2.1 3.5 

Weight GSF 332, 333, 335, 337 0.35 0.3 0.5 0.8 1.2 1.4 2.5 

Weight GSF 334, 338 0.95 0.95 2.3 2.2 3.6 3.15 6.45

Strainers SZ 

Wafer-type strainers SZ 36A 

DN 40 – 100 mm 

Z min 

Z max 

L 


DN 40 – 100 mm 


DN 125 – 200 mm 

L 

Ø D 

Features 

Cylindrical body with drain plug 

Robust, hemispherical screen 

Body and strainer made from corrosion-resistant stainless steel 

Minimum pressure loss 

Application 

In piping systems upstream of equipment that is sensitive to dirt. For liquids, gases, 

steam and aggressive fluids. 


for Wafer-Type Strainers 

Types SZ 36A 

Nominal size 

Overall length 

[mm] 

∅ D 


Type PN 

Design 

[mm] 40 50 65 80 100 125 150 200 

[Inch] 1 1/ 2 2 2 1/ 2 3 4 5 6 8 

L 31,5 40 46 50 60 90 106 140 

∅ Zmin 83 96 110 128 151 – – – 

∅ Zmax 104 118 136 158 186 – – – 

Class 125/150 – – – – – 194 220 275 

PN 10/16 – – – – – 194 220 275 

PN 25 – – – – – 194 226 286 

PN 40 – – – – – 194 226 293 

Class 300 – – – – – 216 251 308 

Weight [kg] 1 1.6 2.1 2.9 4.7 10 14 26 

DN 40 – 100: with spiral centering ring 

Mesh size 1.25 mm 

DN 125 – 200: Mesh size 1.6 mm 

optional 

DN 40 – 200: Fine screen 

Mesh size 0.25 mm 

Materials Pressure / temperature 


SZ 36A PN 40 / class 300 1.4408 A351 CF8M 49.6 bar / -200 ÷ 20°C 24 bar / 550 °C 

* ) For more detailled pressure/temperature specifications as a function of the 

end connection refer to the data sheet. 

73 

A4-A8

Stop Valves GAV 

H 1 

74 

L1 Stop Valve GAV..F 

with bellows spindle seal 

and safety stuffing box 

Dimensions [mm] 

PN 16 – 40 DN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 

Overall length L1 130 150 160 180 200 230 290 310 350 400 480 600 730 850 

Overall height 

GAV 14F/24F/25F 

H1 175 178 184 205 210 235 246 282 304 390 408 570 606 660 

GAV 35F/36F 140 165 165 190 200 220 270 305 345 395 430 500 705 785 

GAV 35/36 220 230 230 280 285 300 348 405 457 515 540 680 810 965 

GAV 46F 230 230 240 285 290 300 355 485 485 485 – – – – 

Weights [kg] 

DN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 

GAV 14F 3.1 4.0 4.7 7.3 7.7 10.2 17.0 22.0 32.0 54.0 70.5 130.0 230.0 328.0 

GAV 24F 3.1 4.1 4.6 8.1 8.5 11.0 17.0 21.0 31.0 51.0 68.5 139.0 239.0 343.0 

GAV 25F 3.1 4.1 4.6 8.2 8.5 11.0 17.0 28.9 40.0 65.0 89.0 – – – 

GAV 35F/36F 3.7 4.6 5.2 9.4 10.6 13.6 22.0 33.0 46.0 67.0 98.0 169.0 270.0 385.0 

GAV 35/36 4.3 5.5 6.2 9.6 10.5 13.5 21.3 33.3 46.0 68.0 95.0 159.0 240.0 390.0 

GAV 46F 6 8 8 12 14 17 25 37 54 83 – – – – 

K vs Values [m 3 /h] for valves with parabolic plug 

PN 15 20 25 32 40 50 65 80 100 125 150 200 250 300 

GAV 14F/24F/25F (16-25) 4.8 8.3 11.9 19.9 27.1 43.3 75.1 116.7 172.3 171.5 204.0 457 714 1028 

GAV 35F/36F 40 2.9 4.9 7.8 15.0 25.0 39.0 61.0 78.0 105.0 130.0 210.0 350 570 860 

GAV 35/36 40 3.4 5.6 8.5 18.0 28.0 44.0 72.0 130.0 170.0 360.0 680.0 1100 1650 2000 

GAV 46F (16-40) 4 7 9 16 25 36 63 100 155 238 – – – –

As Europe's largest provider of boiler equipment, GESTRA meets all the needs of today's market: 

a broad spectrum of products, faster time-to-market for new products, more performance for less 

money and customized solutions and services. This unique market position is based on extensive 

experience acquired over more than 40 years in the design and manufacture of high-quality safetyoriented 

control equipment. To compete in a truly global market, GESTRA is continuing to consolidate 

the domestic market and, simultaneously, stepping up its efforts to deepen international activities 

outside Europe in order to optimize and extend its network of sales and marketing organizations all 

over the world. 

GESTRA technology is tailored to your needs, offering you the right solution – be it conventional or 

bus-based – for your land or marine applications. 

Hight-tech for enhanced safety and reliability! 


Page 

SPECTOR Family ............................................................................................................................ 76 

Level Control, Monitoring and Limitation ...................................................................................... 77 

How to read type codes ........................................................................................................ 78 – 79 

Boiler equipment in acc. with TRD 604 / EN 12952/..53 ........................................................ 80 – 81 

Principles of measurement and fields of application ...................................................................... 82 

Equipment for steam and hot-water boiler plants .......................................................................... 83 

Type Approvals at a Glance ................................................................................................... 84 – 86 

SPECTORbus 

Basic principles .................................................................................................................................. 87 

Level limitation (low/high-level alarm) ................................................................................... 88 – 89 

Level control ......................................................................................................................... 90 – 91 

SPECTORcompact 

Level control/limitation ......................................................................................................... 92 – 93 

Pump control ........................................................................................................................ 92 – 93 

Conventional Design 

Self-monitoring low/high-level alarms ................................................................................... 94 – 95 

Modulating level control ........................................................................................................ 96 – 97 

Accessories for Liquid-Level Alarms Fitted in External Level Pots 

Level electrodes and controls ................................................................................................ 98 – 99 

Level Probes and Control Units for 

Very High Pressure Ranges (NRG 211) .......................................................................... 100 – 101 

Marine Applications .........................................................................................................102 – 103 

Temperature and conductivity monitoring, oil detection .........................................................106 

SPECTORcontrol ...............................................................................................................131 – 132 

75 

B

SPECTOR Product Range 

GESTRA’s SPECTOR Product Range 

Your safeguard for the future 

Reliability, availability and economy have always 

enjoyed top priority in boiler operation. To an 

increasing extent, another aspect is being 

added: plant automation and visualization. 

To implement these fundamental principles, 

GESTRA GmbH has for decades now been 

working exclusively with electrode systems that 

are low in maintenance and wear. In contrast to 

other systems, our electrodes function entirely 

without moving parts. 

76 

Boiler Burner 

In addition to the boiler house equipment, these 

systems have now also conquered peripheral 

containers, such as condensate return systems 

operating with or without pumps, feedwater 

and condensate tanks and other vessels. Since 

the entire energy centre is only as effective as 

its weakest element, many of our customers 

therefore also demand automated control 

equipment for their peripheral containers. 

Higher ranking 

control system, 

e.g. Profibus DP 

GESTRA took another step forward by 

introducing the SPECTOR product range, 

comprising bus-based equipment and compacttype 

equipment. The innovative SPECTOR 

products are not only easy to integrate into 

existing automation systems but also feature 

many new additional benefits that simplify 

the designing and commissioning of new 

installations considerably.

Level Control, Monitoring and Limitation 

Principles of Measurement 

Conductivity measurement 

The water level is detected between the 

electrode tips and the vessel wall (or reference 

electrode) and evaluated for control or limitation 

purposes. In this case it is essential that 

the medium is electrically conductive. 

The high-integrity self-monitoring design of 

the level alarms ensures constant supervision 

of the insulating seal and electrode entry, 

immediately recognizing malfunctions in the 

system and failure of the electrode or supply 

cables. In addition, the equipment features 

periodic self-checking of the electronic control 

unit and the corresponding output contacts. 

Self-monitoring equipment with periodic selfchecking 

is required for boilers with temperature/pressure 

ratings > 1 bar and > 120 °C 

and a volume > 50 l. 

Before installation, the length of the conductivity 

electrode rods must be cut to the 

required switching levels. 

Capacitance measurement 

Electrode rod and vessel wall (or reference 

electrode) form a capacitor; air and the fluid 

to be controlled act as dielectric. Due to 

the different dielectric constants of air and 

boiler water the capacitance value between 

the electrode and the vessel wall changes 

concurrently with level changes. 

The switchpoints can be continuously adjusted 

during operation and multiplied by connecting 

in parallel several electronic control units. 

Types of Controls 

Water level limiters 

(High-level/low-level alarms) 

As soon as the water level exceeds or falls 

below the adjusted switchpoints the burner 

protection circuit is interrupted (low level) or 

the feed pump is switched off (high level). 

On-off level control 

The water level is controlled between two fixed 

or adjustable switchpoints. The signals are 

directly transmitted to the feed pump or valve. 

Modulating level control 

The water level is continuously monitored and 

the actual value is compared with the adjusted 

set point by the associated controller. If a 

deviation between the two values is detected, 

a signal will be sent to the control valve to 

re-adjust the flowrate accordingly, thereby 

enabling a more economic and efficient steam 

plant operation. 

Field Bus System 

Digital Data Exchange 

The Spector Bus system transfers the digitized 

measurement data acquired by the level 

probe to the electronic control unit located in 

the control cabinet. The centerpiece of this 

system is the stable and sophisticated CAN 

bus (Controller Area Network). Several sensors 

and switches can be interconnected via one 

bus line. 

Apart from active cable monitoring a CAN 

bus system offers a host of benefits, such as 

increased design flexibility, reduced installation 

effort, optimized open and closed loop control, 

centralized operation and remote monitoring. 

The standardised network opens up highly 

flexible possibilities for configuration. The 

CANopen protocol is used nowadays in medical 

equipment, electronic devices for marine 

applications, public means of transport and in 

burner and boiler controls of power plants. 

Thanks to the many CANbus applications a 

great number of equipment and interface 

components are widely available, providing an 

ideal addition to our product range. 

MIN 

URB 1 

READY 

TO 

OPERATE 

P E 

M 

1 

2 

Max NRS 2 -40 

1 2 

3 

Min 

P 

3 4 

E 

4 

Test 

77 

B

How to Read Type Codes 

GESTRA Type Designations for Boiler Controls 

78 

Measured variable 

B = Density (TDS) 

D = Pressure 

L = Conductivity 

M = Mechanical Quantity 

N = Level 

O = Oil and Turbidity 

P = Program control 

T = Temperature 

U = Universal 

Z = Time 

Closed-loop 

control 

Function 

A = Display 

B = Operating unit 

C = Control unit 

G = Sensor 

N = Power supply unit 

R = Controller 

S = Switch 

T = Transmitter 

V = Preamplifier 

N R G 2 1 - 5 1 

N R S 1 - 1 

N R G S 1 6 - 1 

Code of variants 

Consecutively numbered 

Pressure Rating 

1 = PN 6 

2 = PN 10 

6 = PN 40 

7 = PN 63 

8 = PN 63/100 

9 = PN 160 

10 = PN 250 

11 = PN 320 

Principle of Measurement 

1 = Conductivity 

2 = Capacitance 

3 = Ultrasonic 

4 = Photoelectric 

5 = Temperature

How to Read Type Codes 

GESTRA Type Designations for Boiler Controls 

Function: 

Input signal 

(x) 

Sensor 

Sensor 

Sensor 

N R 

... ... 

T 

S 

R 

R 

(Transmitter) 

(Switch) 

Three-position controller 

W (Setpoint) 

Continuous controller 

W (Setpoint) 

Output signal 

(y) 

0/4.....20 mA 

Sensor 0/4.....20 mA 

Level Switch Type NRS 1-1 .. 

a # Enclosure for wall mounting 

b Enclosure for installation in control cabinet 

c* 19" slide-in unit 

d Spare plug-in card for 19" slide-in unit 

e Case for panel mounting 

f Integrated solenoid valve plug 

# Often design b with additional enclosure for wall mounting 

* Installation in 19" mounting panel provided on site or separately 

supplied 19" mounting panel 

79 

B

GESTRA Steam Plant 

D 

80 

T 

P 

S A J B C D R 

D 

G 

H 

L 

Boiler equipment acc. to TRD 604 (continuous operation without constant supervision for 24/72 hrs) 

or in accordance with other European guidelines, e. g. EN 12953 part 6 

A Self-monitoring 

low-level electrode NRG 16-40 

AJ Low-level alarm NRS 1-40/NRS 1-40.1 

BR Modulating level control with fully integrated second 

level and conductivity (TDS) indicator: 

level electrode NRG 26-40, level controller NRR 2-40, 

control terminal and display unit URB 1/URB 2 

C Self-monitoring high-level alarm: 

level electrode NRG 16-41, level switch NRS 1-41 

DE TDS control / Continuous and intermittent boiler blowdown: 

Conductivity electrode LRG 16-40, continuous blowdown 

controller LRR 1-40, continuous blowdown valve BAE, 

intermittent blowdown valve MPA, 3/2 way pilot valve, strainer 

F Sample cooler 

F 

M 

P 

C A B A 

E 

I 

N 

P 

K 

G Flash vessel 

Q 

P 

O 

H Residual blowdown heat exchanger 

I Blowdown receiver (mixing cooler) 

J Self-monitoring temperature limiter: 

resistance thermometer TRG 5-65, 

temperature switch TRV 5-40, 

NRS 1-40.1 (only with existing 

superheater) 

K Safety valve GSV 

L Pressure limiter DSH 

P 

M Pressure controller/transmitter 

J 

N DISCO Non-return valve RK 86 A 

P 

T

GESTRA Condensate Monitoring 

U 

O Strainer GSF 

P Bypass/isolating valve GAV 

Q Electric/pneumatic control valve V 725 

R Control terminal and display unit URB 1/URB 2 

S Operating data acquisition 

T Feedwater monitoring: 

On-line analysis of residual hardness of water 

Demineralization plant: TDS control 

(conductivity monitoring) 

N 

W 

V 

X 

Steam and Condensate System 

U Steam trap 

V Contamination detectors (ingress of acids, alkalis, etc.): 

Conductivity electrode LRG 16-9, 

Conductivity switch LRS 1-7a 

Alternatively with EC / TÜV approval: 

Compact electrode LRGT 16-1 

Controller with MAX contact KS 90 

W Monitoring for the ingress of foreign substances such as oil, 

grease etc.: Oil and turbidity detector OR 52/5 

X Pneumatic three-way control valve 

for the discharge of contaminated condensate 

Y Condensate receiver tank 

Z Safety circuit 

N 

W 

Y 

81 

Z 

B

Fundamental Principles of 

Measurement and Applications 

Technologically Advanced Liquid 

Level Control 

With more than 40 years‘ experience in 

the design and manufacture of industrial 

electronics and almost a century in all fields 

of steam trapping and shut-off valves, GESTRA 

enjoys a unique position in the industry as 

a trusted single-source partner for boiler 

equipment. 

Right from the outset GESTRA blazed 

a trail in advanced boiler safety. In our drive 

to set new safety standards, we were the 

first company to team up with the German 

Technical Supervisory Association TÜV in order 

to design self-monitoring low-level alarm 

systems. 

Apart from low-level alarms GESTRA now 

offers an extensive range of electronic boiler 

equipment for power stations as well as 

industrial applications. 

Our latest, trend-setting innovation is the new 

Spector equipment featuring advanced busbased 

technology, which provides a futureproof 

framework for decentralized, flexible 

operations. 

Examples of Industrial Applications 

Purpose Application 

Level control Fill or discharge control with protection against pump 

running dry and high-level alarm 

Fill or discharge control with protection against pump 




Modulating fill or discharge control with protection against 

pump running dry and high-level alarm incl. level indicator 

82 

Application 

Modulating level detection for remote indication 

Modulating fill or discharge control with protection against 

pump running dry and high-level alarm 


running dry and high-level alarm Marine application 

Fill control with high-level alarm Marine application 

Measurement 

Capacitance Conductivity 

Steam boilers 

Hot-water boilers 

Steam regenerator 

Condensate tanks 

Feedwater tanks 

Fresh water tanks 

Pump sumps 

Holding tanks 

Product tanks 

Tunnel drainage 

Drainage systems in power stations – 

Autoclave drainage 

Pump controls 

Oil detection in cooling-water systems – 

Daily service tanks for oil – 

Diesel fuel tanks – 

Principle of 

measurement 

Conductivity 

meas. 

Conductivity 

meas. 

Conductivity/ 

capacitance meas. 

Conductivity/ 


Conductivity/ 


Conductivity/ 


Conductivity/ 


Conductivity/ 


Level 

electrode 

Level 

switch 

Switch 

point 

NRGS 1.-1 – fixed 

NRG 16-42 NRS 1-42 fixed 

NRG 26-40 NRS 2-40 adjustable 

NRG 26-40 NRR 2-40/URB adjustable 

NRGT 26-1 URA 2 – 

NRGT 26-1 KS 92-1 adjustable 

NRGT 26-1S NRS 2-3 adjustable 

NRGT 26-1S KS 92-1 adjustable

Equipment for Steam and 

Hot-Water Boiler Plants 

Boiler 

operating 

mode 

TRD 701 

max. 1 bar*) 

TRD 802 

for fast steam 

generating units 

TRD 604 

without 

constant 

supervision – 

24 hours 

2 Low level 

limiter 

1 Feedwater 

controller/ 

high-level 

alarm 

EN 12953 

section 6 

EN 12952 

section 7 

TRD 604 

without 

constant 

supervision – 

72 hours 

2 Low level 

limiters 

1 Feedwater 

controller 

1 High-level 

alarm 

1 Conductivity 

sensing 

electrode 

with superheater 

1 Self- 

monitoring 

temp. limiter 

Low level 

limiter 

WB 

Feedwater 

controller 

WR 

High level 

alarm 

HW 

First 

low level 

alarm 

Conduct. 

sensing 

electrode 

Temperature 

limiter 

PN Level electrode 

Level switch/ 

controller 

Switchpoint 

On-off 

control 

– – 6 NRGS 11-2 – fixed – 

– – 40 NRGS 16-2 – fixed – 

– – – 40 NRG 16-40 (2x) NRS 1-40 (1x) fixed – – 








– 40 NRG 16-42 NRS 1-42 fixed – 

– 40 NRGS 16-1 – fixed – 

– 40 NRG 26-40 NRS 2-40 adjustable – 

– 40 NRG 26-21 NRS 2-1 adjustable – 

– 40 NRG 26-40 NRR 2-40/URB adjustable – 

– 40 NRGT 26-1 KS 92-1 adjustable – 

– 40 NRG 26-21 NRR 2-2 adjustable – 

– – – 40 NRG 26-21 NRR 2-1 adjustable – 

– 63 244 LD / 705 KS 92-1 adjustable – 

– 160 244 LD / 705 KS 92-1 adjustable – 









– 1 ) 40 NRG 16-42 NRS 1-42 fixed – 

– 1 ) 40 NRGS 16-1 – fixed – 

– 1 ) 40 NRG 26-40 NRS 2-40 adjustable – 

– 1 ) 40 NRG 26-21 NRS 2-1 adjustable – 

– 1 ) 40 NRG 26-40 NRR 2-40 / URB adjustable – 

– 1 ) 40 NRG 26-21 NRR 2-2 adjustable – 

– 1) 40 NRGT 26-1 KS 92-1 adjustable – 

– 1) 63 244 LD / 705 KS 92-1 adjustable – 

– 1 ) 160 244 LD / 705 KS 92-1 adjustable – 

– – – 40 NRG 16-4 NRS 1-2 fixed – – 

– – – 40 NRG 16-41 NRS 1-41 fixed – – 

– – – 63 NRG 17-41 NRS 1-41 fixed – – 

– – – 160 NRG 19-41 NRS 1-41 fixed – – 

– – – 40 NRG 16-12 NRS 1-8 fixed – – 

– – – 63 NRG 17-12 NRS 1-8 fixed – – 

– – – 160 NRG 19-12 NRS 1-8 fixed – – 

40 LRGT 16-1 KS 90 adjustable 



40 LRG 16-40 LRR 1-40 / URB adjustable 



63 LRG 17-1 LRR 1-5 / URS 2 adjustable – 

160 LRG 19-1 LRR 1-5 / URS 2 adjustable – – 

40/160 TRG 5-6x/TRV 5-40 NRS 1-40.1 2 *) adjustable – – 

Modulating 

control 

40/160 TRG 5-5x TRS 5-6 adjustable – – 

*) according to PED max. 0.5 bar 

1 ) Only as first alarm. Low-level limiter and feedwater control electrodes or low-level limiter and high-level alarm electrodes can be installed together in one flange. 

2 *) The level switch NRS 1-40.1 can be used for up to 4 limiting functions, e. g. 2 x NRG 16-40 (low level), 1 x NRG 16-41.1 (high level), 1 x TRV 5-40 (self-monitoring temperature limiter) 

83 

B

Type Approvals at a Glance 

GESTRA Boiler controls acc. to TRD 604, sheet 1, 24/72 hrs or EN 12953, part 6 

TÜV, EC Type Approval Revised: February 2004 

TRD 604 EN 12953, part 6 

Function required recommended Section required recommended Section Equipment Type approval no. 

2 Low-level 

limiters 

Low-level limiter/ 

High-level alarm 

in Bus system 

Low-level limiter/ 

High-level limiter/ 

Temperature limiter 

Low-level limiter 

with control/ 

High level 

Feedwater controller 

with high-level alarm 

Feedwater controller 

with high-level alarm 

Separate 

high-level alarm 

84 

yes 1.4 

3.6.1 

yes 1.4 

3.6.1 

1.8 

5.1 

yes 1.4 

3.6.1 

1.8 

5.1 

1.6 

1.7 

3.63 

yes 1.4 

1.8 

3.4 

yes 1.8 

3.4 

yes 1.4 

3.4 

yes 

»72h« 

yes 4.3.1 

5.7.1 

yes 4.3.1 

5.7.1 

yes 4.3.1 

5.7.1 

4.4 

5.7.2 

yes 4.3.1 

5.7.1 

4.5.2 

yes 4.5.2 

5.5 

5.6.1 

5.6.2 

yes 4.5.1 

5.5 

5.6.1 

5.6.2 

According to TRD regulations you may only combine low-level limiters with level controls or high-level alarms. 

1.8 

5.1 

NRG 16-40 / NRS 1-40 

Self-monitoring equipment 

with automatic routine testing 

NRG 16-11 / NRS 1-7 



NRG 16-40 / NRS 1-40 



NRG 16-41 / NRS 1-41 



NRG 16-40 


NRG 16-41.1 


TRG / TRV 5-40 


NRS 1-40.1 / NRS 1-40.2 

NRG 16-36 / NRS 1-9 



NRGS 16-1 

Compact system for 

on-off control 

NRG 16-42 / NRS 1-42 

Bus-based on-off control 

TÜV SWB/SHWS 07-403 

EG BAF-MUC 02 02 

103881 002 

TÜV WB 05-354 

EG 01 202 931-B-01-0007 



103881 002 

TÜV SWB/SHWS STW (STB) 

03-413 


103881 004 

TÜV WB/WR 04-370 

EG 01 202 931-B01-0075 

TÜV WRB 06-388 

TÜV WR 04-399 

ER 56 / NRS 1-5 

TÜV WR 08-302 

On-off control - discontinued - 

NRGT 26-1 

TÜV WR 07-391 

Compact system for 

continuous monitoring, 

current output 4...20 mA 

NRG 26-40 / NRS 2-40 TÜV WR 04-399 

Bus-based on-off controller 

with adjustable switchpoints 

NRG 26-21 / NRS 2-1 TÜV WR/WS 04-317 

On-off control - discontinued - 

with adjustable switchpoints 

NRG 26-40 / NRR 2-40 TÜV WR 04-399 

URB 

Bus-based modulating 

controller with 

adjustable limits 

NRG 26-21 / NRR 2-1 TÜV WR 04-317 

Modulating control 

- discontinued - 

NRG 26-21 / NRR 2-2 TÜV WR 06-320 

Modulating control 

with adjustable limits 

- discontinued - 

LD 244 TÜV WRS 06-324 

5.6.2 NRG 16-4 / NRS 1-2 

Conventional design 

NRG 16-12 / NRS 1-8 


NRG 16-41 / NRS 1-41 



TÜV WR/WB 08-302 

TÜV HWS 08-417 



103881 002

Type Approvals at a Glance 

GESTRA Boiler controls acc. to TRD 604, sheet 1, 24/72 hrs or EN 12953, part 6 

TÜV, EC Type Approval Revised: February 2004 

TRD 604 EN 12953, part 6 

Function required recommended Section required recommended Section Equipment Type approval no. 

Safety temperature 

limiter 

Safety temperature 

limiter 

Safety pressure 

limiter 

Conductivity 

(TDS) control for 

boiler water *) 

Automatic 

continuous boiler 

blowdown system *) 

Automatic 

continuous boiler 

blowdown 

with signalling of 

limit levels *) 1) 

Automatic 

intermittent 

boiler blowdown 

Conductivity 

(TDS) control 

for make-up 

water *) 

Residual hardness 

of make-up water 

(process titration) *) 

Condensate 

monitoring: 

oil and turbidity 

detection *) 

Contamination 

detection of acids, 

alkalis etc. *) 

yes 1.6 

1.7 

3.6.3 

yes 1.6 

1.7 

yes 1.3 

3.6.4 

yes 4.4 

5.7.2 

TRG 5-6.. / TRV 5-40 

PT 100 

NRS 1-40.1 

yes 5.7.2 TRG 5-5.. / TRS 5-6 

PT 100 

3.6.3 4.4 TRG 5-.. / TRS 5-7 

Thermocouple type K 

yes 5.7.2 DSF ..F 001 


yes 5.2 LRG 16-4 / LRS 1-5 

manual temperature 

compensation 

optional yes 2.1 

4.8 

optional 

yes 

»72h« 

yes C 1.8 LRG 16-4 / LRS 1-5 

On-off control 

LRGT 16-1 / LRGT 16-2 / 

KS 90 

Three-position stepping 

control, automatic 

temperature compensation 

yes 5.2 yes C 1.8 LRG 16-4 / LRR 1-5 / URS 2 

On-operation-off 

manuel temperature 

compensation 

LRGT 16-1 / LRGT 16-2 / 

KS 90 

Three-position stepping 

control, automatic 


Max. limit 

LRG 16-40 / LRG 16-41 / 

LRR 1-40 

Bus-based continuous boiler 

blowdown, three-position 

stepping control, automatic 


Max. limit 

optional yes 2.1 / 5.2 

4.8 

yes 

»72h« 

yes 

»72h« 

yes 

2 

4.8 

5.2 

5.2 

2.1 / 4.8 

»72h« 

5.2 

2 detectors 

yes 2.1 / 4.8 

5.2 

Explanatory notes: 

*) Approximate values and limits according to TRD 611 / EN 12952-12 and EN 12953-10 

1 ) Combining continuous boiler blowdown and limit control precludes the need for pure limit signalling. 

T.D.S. = Total Dissolved Solids 

TÜV SWB/SHWS STW (STB) 

03-413 


103881 004 

DIN CERTO STW (STB) 117906 

STW (STB) 985 07 S 

EG 01 202 931-B-01-0008 

STW (STB) 986 07 S 

EG 01 202 931-B-01-0007 

www.tuev.com 

0000006024 

not available 

not required 

TÜV WÜL 06-003 


105620 001 

not available 

yes 5.3.1 TA / MPA 

LRR 1-40 / MPA 

not required 

LRG 16-4 / LRS 1-6 not available 



105620 001 



103881 003 

yes 5.6.3 OR 52-5 / -6 TÜV WÜF 07-009 

yes 5.6.3 LRG 16-9 / LRS 1-7 TÜV WÜF 

85 

B

Type Approval Nos. at a Glance 

Type Approval Number Code 

T Ü V S W B 0 2 4 0 3 

Safety 

Measured quantity 

W = Water 

T = Temperature 

D = Pressure 

Function 

B = Limiter 

R = Controller 

S = Switch 

W = Detector 

Classification societies for 

marine applications 

GL Germanischer Lloyd 

LR Lloyd's Register 

See BG See-Berufsgenossenschaft 

RINA Registro Italiano Navale 

ABS American Bureau of Shipping 

KR Korean Register of Shipping 

BV Bureau Veritas 

DNV Det Norske veritas 

86 

Year of approval 

or extension 

VdTÜV Bulletin 

Abbreviations for temperature 

control equipment: 

STW = Safety temperature controller 

(STB) = Safety temperature limiter designed 

with interlocking facility 

TW = Temperature controller 

Function Equipment Type Approval Number 

Water-level controller with 

high-level alarm 

NRGS 16-1S 

Compact system for on-off control 

NRGT 26-1S 

KS 92-1 

NRS 2-3 

Compact system for modulating control, 


Water-level limiter NRG 16-11S 

NRS 1-7 

Self-monitoring equipment with automatic routine testing 

Combination electrode 

1 Water-level limiters 

Combination electrode 

2 Water-level limiters 

NRG 16-38S 

NRS 1-7 

Specification see below 

NRG 16-39S 

NRS 1-7 (2x) 

Self-monitoring equipment with automatic routine testing 

combined with compact system for continuous monitoring 


GL99250-96 HH 

LR 98/20075 

RINA No ELE/30298/1 

GL 99249-96 HH 

LR 98/20074 

BV 10617/Bo 


KR HMB06190-MS002 

DNV A-8394 

LR 98/20076 

GL WB-93-349001 

BV 10618/Bo 


KR HMB06190-MS002 

LR 01/20026 

GL 40 601 - 01 HH 

ABS 01-HG227959/1-PDA 

KR HMB06190-MS002 

DNV A-8394 

BV 11400/A1 BV 

Safety temperature limiter TRG 5-5../TRS 5-6 GL 99251-96 HH 

LR 00/20051 

Conductivity monitoring (feedwater) LRGT 16-1 GL 33254-06 HH 

Fine filter monitoring of bilge water, 15 ppm alarm IMO-OR 52/7 See BG 320.030 

Monitoring of cooling water ORGS GL 17106-00 HH 

LR 07/20031 

BV 17515/A0 BV 

Monitoring of condensate / feedwater OR 52-5 GL 94855-94 HH

mA V 

Basics 

MIN (NW) (LW) 

Self-monitoring 

conductivity 

level electrodes 

NRG 1...-40 

24 V DC 

↔ bus signal (2x) 

Visual display unit Level switch 

NRS 1-40 / NRS 1-40.1 

with automatic testing 

routine (in control 

cabinet) 

(1x) 

GESTRA Boiler Protection System 

Wago – I/O 

Control 

SPECTORbus 

With these systems, proven technology in the design 

of electrodes has been alloyed with innovative new 

level detection and evaluation techniques: All level 

electrodes feature now special electronic sensor 

units which, via a bus interface, can exchange data 

automatically with level controllers or higher-level 

control systems. 

The next era in liquid level monitoring and control 

has dawned. 

Features and Benefits of SPECTORbus 

n Patented thermal barrier in cylindrical body above 

electrode flange 

n Terminal box equipped with excess temperature 

fuse (85 °C) 

n Freely accessible connecting terminals 

n Large terminal box makes for easy installation 

n Standardized response sensitivity ≥ 0.5 µS/cm 

simplifies stocking and spare part inventories 

n Optimum system adaptation/extension without any 

additional wiring 

n Reduced installation effort and material costs, 

since only a single four-core cable is required 

between boiler and control cabinet 

MAX (HW) 

Self-monitoring 

conductivity 


NRG 1...-41/.-41.1 

24 V DC 

↔ bus signal 

Level switch 

NRS 1-41 

(in control cabinet) 

NRS 1-40.1 

(LW, HW*), Temp.) 

100 % 

MAX 

MIN 

0 % 

Capacitance 

level electrode 

NRG 26-40 

24 V DC 


Control terminal and 

display unit URB 2 

(panel mounting) 

*) The system can do without the separate NRS 1-41 if the burner is switched off by the high level function 

Valve OPEN/ 

CLOSED 

n Reduced cost of control cabinet 

– only one PG thread 

– only five input terminals 

– only one cable in control cabinet 

for all sensing units 

n Active cable monitoring through message identification 

for error detection and prioritisation of 

messages in the event of low-level alarm 

n Length of cable between sensor and controller 

125 m; max. cable length 1000 m 

n Easy to integrate in visual display and automation 

systems 

n Thanks to increased functionality of controllers 

less component parts required 

n Limiter 

– Two electrodes but only one controller 

– Switch-selectable one/two-electrode system 

(emergency operation) 

– Instantaneous indication of low level by 

separate, flashing diode as soon as the liquid 

falls below low level (simplifies routine testing) 

– After time delay has elapsed, the LEDs stop 

flashing and are permanently illuminated 

– Separate, instantaneous signal output for low 

water level 

– Self-test routine combined with automatic selfchecking 

of respective output relay contacts 

Conductivity 

electrode 

LRG 16-40 

24 V DC 


Level controller 

NRS 2-40 


STB 

Temperature 

sensor 

TRG 5-6... 


NRR 2-40 


LRR 1-40 NRS 1-41*) 

TRV 5-40 

Blowdown controller 

LRR 1-40 


n GESTRA Boiler Protection System 

– up to 4 limiters for one control unit (2 x LW, HW, 

safety temp. limiter – in any combination). 

n Controller 

– Less time-consuming calibration of measuring 

range; 100 % can be adjusted at level 50 %. 

– No additional time relays required for system 

optimization. Built-in time delays individually 

adjustable between 1...25 sec. for each contact 

and position. 

– Reduced wiring effort for control cabinet: Only 

a single four-core cable is required for wiring 

the panel-mounted control terminal and display 

unit, since all switchgear controls remain on 

the mounting panel where their functions are 

required. 

– One operating and control terminal for all 

connected bus nodes. 

– The control terminal features permanent level 

and conductivity indication according to TRD 

401 (second water-level indication) and draft of 

rules concerning conductivity limiters. 

– Easy parameterization of controls on control 

terminal or PC. 

87 

B

Level Limitation 

Low-Level Limiter 

Control unit NRS 1-40 in conjunction with 

one level electrode type NRG 16-40, 17-40, 

19-40 or 111-40 constitutes a high-integrity 

self-monitoring low-level limiter with periodic 

self-checking and automatic routine testing of 

output relay contacts. Function: 

n Low-level alarm with one switchpoint. 

The equipment detects min. water level 

(low-level alarm). 

Application in steam and pressurized hotwater 

boilers according to TRD 401, TRD 602 

and TRD 604, EN 12952/..53. 

High-Level-Alarm 

Low-Level Limiter 


one level electrode type NRG 16-41, 17-41 or 

19-41 constitutes a high-integrity self-monitoring 

high-level alarm system with periodic 

self-checking and automatic routine testing of 

output relay contacts. Function: 

n High-level alarm 

The equipment detects the max. water level. 

Boiler Protection System 

Description 

The control unit NRS 1-40.1 in combination 

with two level electrodes NRG 1.-40, the 

temperature sensor TRG 5-6../TRV 5-40 and, 

if required, the level electrode NRG 1.-41.1 

constitutes a self-monitoring boiler protection 

system with periodic self-testing and continuous 

monitoring of the output relays. The 

control unit features the following functions: 


88 


(Low and High Level Alarms) 

Type Pressure rating End connection 


two level electrodes type NRG 16-40, 17-40, 

19-40 or 111-40 constitutes a high-integrity 

self-monitoring low-level limiting system 

with periodic self-checking. The control unit 

features the following function: 

n Low-level alarm with two switchpoints. 

The equipment combination detects lowwater 

level (low-level alarm system). 


boilers according to TRD 604, sheet 1 

and 2 (operation without constant supervision 

for 24/72 hrs.). 


boilers according to TRD 401, TRD 602 

and TRD 604, EN 12952/..53. 

The electric device complies with the regulations 

for safety circuits to DIN EN 50156. 

n Low-level alarm with two switchpoints 

The equipment combination detects the min. 

water level (low-level limiting system). 

n Safety temperature limiter 

The equipment combination detects the max. 

allowable temperature. 

n High-level alarm 

The equipment combination detects the max. 

water level. 

n Or other customized combination. 

If more than four limiters are required, 

the control unit NRS 1-40.2 can also be 

integrated in the system. 

Service pressure [bar] / 

Saturated steam temperature 

The electric device complies with the regulations 

for safety circuits to DIN EN 50156. 

The liquid level data are transferred from the 

electrode NRG 1...-40 to the control unit via 

CAN bus, using the CANopen protocol. 

The safety temperature limiter type TRG 5-6./ 

TRV 5-40 can be added to the system; for 

more information refer to pages 106 – 107. 

The liquid level data are transferred from the 

electrode NRG 1...-41 to the control unit via 

CAN bus, using the CAN open protocol. 

Application in steam and (pressurised) hotwater 

plants in accordance with TRD 604, 

sheet 1 and sheet 2 (24/72 hrs operation). 

The electrical equipment meets the requirements 

of the regulations for safety circuits 

according to DIN EN 50156. 

The data of the sensors are transferred to the 

control unit via CANbus, using the CANopen 

protocol. 

Lengths supplied 

[mm] 

Ambient temperature 

[°C] 

NRG 16-40 PN 40 ¾" 32 / 238 500 – 3000 70 

NRG 17-40 PN 63 ¾" 60 / 275 500 – 3000 70 

NRG 19-40 PN 160 ¾" 100 / 311 500 – 3000 70 

NRG 111-40 PN 320 1" 180 / 357 500 – 3000 70 

NRG 16-41(.1) PN 40 ¾" 32 / 238 500 – 1500 70 

NRG 17-41(.1) PN 63 ¾" 46 / 260 500 – 1500 70 

NRG 19-41(.1) PN 160 ¾" 100 / 311 500 – 1500 70

Self-monitoring low-level alarm system to TRD 604 (24/72 hrs without 

constant supervision)/EN 12952/53 

Flange 

DN 50 mm 

Low 

level 

High-level alarm TRD 604, 72h 

Level electrode 

NRG 16-41 

Flange 

DN 50 mm 

High level 

Low 

level 

Self-monitoring boiler protection system 

TRD 604 24h/72h / EN 12952/53 


NRG 16-41.1 

Flange 

DN 50 

mm 

High 

level 

Level electrodes 

NRG 16-40 


NRG 16-40 

Flange 

DN 50 

mm 


(Low and High Level Alarms) 

Low 

level 

Level switch 

NRS 1-41 

Low 

level 

Level switch 

NRS 1-40 

TRV 

5-.. 

Power 05 

24 V, DC 

Level switch 

NRS 1-40.1 

TRG 5-6. 

Burner 

protection 

circuit 

0525 

Feed OFF or 

burner OFF 

0525 

Burner 

protection 

circuit 

0525 

Type PN Stock code 

NRG 16-40 

NRS 1-40 

NRG 17-40 

NRS 1-40 

NRG 19-40 

NRS 1-40 

NRG 111-40 

NRS 1-40 

1000 mm 

230 V 

1000 mm 

230 V 

1000 mm 

230 V 

1000 mm 

230 V 

Optional: NRS 1-4. 

special voltage: 115 V, 50..60 HZ 

40 

63 

160 

Type approval 


EG BAF-MUC 02 02 103881 002 

Type approval 

TÜV SWB/SHWS STW (STB) 03-413 

EG BAF-MUC 03 07 103881 004 

TRG 5-6... / TRV see pages 106 – 107 

3514042 

3222541 

3544042 

3222541 

3574042 

3222541 

320 3574142 

If supervision is limited, the system can be operated 

with one electrode. 


NRG 16-41 

NRS 1-41 

NRG 17-41 

NRS 1-41 

NRG 19-41 

NRS 1-41 

500 mm 

230 V 

500 mm 

230 V 

500 mm 

230 V 

Type approval 


EG BAF-MUC 02 02 103881 002 

For flanges see Price List 

40 

63 

160 

3524041 

3222741 

3551241 

3222741 

3594041 

3222741 


NRG 16-40 1000 mm 

3514042 

TRG 5-65 

2671611 

TRV 5-40 

40 2691040 

NRG 16-41.1 500 mm 

3524141 

NRS 1-40.1 230 V 

3222841 

NRG 17-40 1000 mm 

3544042 

TRG 5-65 

2671611 

TRV 5-40 

63 2691040 

NRG 17-41.1 500 mm 

3551341 

NRS 1-40.1 230 V 

3222841 

NRG 19-40 1000 mm 

3574042 

TRG 5-65 

2671611 

TRV 5-40 

160 2691040 

NRG 19-41.1 500 mm 

3594141 

NRS 1-40.1 230 V 

3222841 

Optional: NRS 1-40.2, 230 V 3222941 

89 

B

Description 

1. Conductivity Measurement 

NRG 16-42 

The level electrode type NRG 16-42 works 

according to the conductivity measurement 

principle. With the NRG 16-42 a maximum 

of four levels can be signalled in conductive 

liquids: 

n Four levels with one switchpoint each 

n High-level alarm, first low-level alarm, 

pump on, pump off, with one switchpoint 

each 

Use level electrode NRG 16-42 in combination 

with level switch type NRS 1-42 or other 

system components. The level data are 

transferred to the level switch or any other 

system component via a CAN data bus. 

NRS 1-42 

Use level switch type NRS 1-42 in combination 

with level electrode type NRG 16-42 for 

level monitoring. 

The level switch has the following functions: 

n Four levels with one switchpoint each 



each 

The level data are transferred from the 

electrode NRG 16-42 to the level switch via a 

CAN bus. 

2. Capacitance Measurement 

NRG 26-40 

The level electrode NRG 26-40 works according 

to the capacitance measurement principle. 

The NRG 26-40 is used for detecting and 

signalling different levels in conductive and 

non-conductive liquids: 

n Level always within defined measuring 

range of electrode. 

Use level electrode NRG 26-40 in combination 

with level switch type NRS 2-40 or further 

system components. 

Differences between URB 1 and URB 2 

90 

The level data are transferred to the level 

switch or any other system component via the 

CAN data bus. 

NRS 2-40 

Use level switch type NRS 2-40 in combination 

with level electrode type NRG 26-40 for 

level control and monitoring. The level switch 

has the following functions: 

n Four liquid levels with one 

switchpoint each 



each 

The level switch NRS 2-40 can be optionally 

equipped with an actual value output for 

standard signal 4-20 mA. 

The level data are transmitted from the 

electrode NRG 26-40 to the level switch via a 

CAN data bus. 

If you want to connect a second NRS 2-40 

in order to establish additional switchpoints 

please indicate this when ordering. 

NRR 2-40 

Use level controller NRR 2-40 in combination 

with level electrode type NRG 26-40 for level 

control and monitoring. The level controller 

has the following functions: 

n Two limit values with one switchpoint each 

(high-level alarm and first low-level alarm) 

n Three-position or modulating control within 

a predefined proportional band 

n All contacts feature time delays adjustable 

between 1 – 25 sec. 

n Continuous level monitoring within defined 

measuring range of the electrode. 

The NRR 2-40 features an optional output 

for standard signal 4-20 mA, which can be 

used for actual value and/or modulating control. 

The level data are transferred from the 

electrode NRG 26-40 to the level controller 

via a CAN data bus. 

URZ 40 

As an alternative to the control system via a 

three-position stepping output, the URZ 40a 

can be mounted to the control valve in order 

to provide the control function for the CAN 

bus. 

URB 1 / 2 

The URB is a user-friendly control terminal 

and display unit for use with GESTRA CAN 

bus systems. With the URB all standard functions 

of the CAN bus system can be easily 

called up and adjusted. Furthermore, the URB 

makes the parameterization of the controller 

very convenient: The switchpoints and the 

proportional band can be adjusted by means 

of the keypad regardless of the actual level. 

The energizing and de-energizing times of the 

relays can be customized for the individual 

switchpoints. 

The LCD of the URB displays the following: 

n Current liquid level (second water level) 

(TRD 401, EN 12952, ...53) 

n Current conductivity value (TSD control) 

n Proportional band of controller 

(NRR 2-40), (LRR 1-40) 

n Switchpoints 

n Position and value of switchpoint low level 

n Position and value of switchpoint high level 

n Position of set point (NRR 2-40), 

(LRR 1-40) 

n Deviation 

n Valve position 

n Manual/automatic operation 

n Current CAN bus address 

n Indication of high/low level alarm 

n Temperature (URB 2) 

n Pressure (URB 2) 

Function URB 1 URB 2 

Display 


Graphic display 

124 x 64 pixel, 58 x 40 mm 

¼ VGA, monochrom 

320 x 240 pixel, 115 x 85 mm 

Colour display No Optional 

Basic window Bar chart Numerical Bar chart Numerical 

Level 

Conductivity 

Level 

Conductivity 

Level Level 

Conductivity 

Pressure 

Temperature 

Operation Via push-button Via control knob 

Navigation in the menu Via push-button Via control knob 

Password protection (to avoid operating errors) No Yes 

Software update No Yes, Flash 

System freely expandable No Yes, software update 

Connection for camera (e. g. local water level indicator) No Yes, colour display

On-off control with fixed switchpoints 

Spector BUS system 

Multiple level electrode 

NRG 16-42 1" BSP 

On-off control with adjustable switchpoints 


Level electrode NRG 26-40 

¾" BSP 

Level switch NRS 2-40 

Modulating control with high-level alarm and first low-level alarm 



NRG 26-40 ¾" BSP 

Connecting 

flange DN 50 mm 

Level switch NRS 1-42 

High level 

Pump OFF 

Pump ON 

First low-level 

alarm 

Connecting 

flange DN 50 mm 

High level 

Pump OFF 

Pump ON 


alarm 

Connecting flange 

DN 50 mm 

High level 

Level control 

First lowlevel 

alarm 

URZ 40a 


Second 

device 

Level controller NRR 2-40 

Feedwater 

control valve 

V 725 

DN 50 mm 


Control terminal 

and display unit 

URB 1 (2) (optional) 

First low-level alarm 



alarm 

Control terminal 

and display unit 

URB 1 (2) (optional) 



alarm 



alarm 


terminal 

and display 

unit URB 1 (2) 


NRG 16-42 

NRS 1-42 

L = 1000 mm 

230 V 

40 

3534248 

3222241 

Optional: URB VDU 3381043 

Optional 115 V, 50..60 Hz 

Type approval 

TÜV WR 04-399 


NRG 16-40 

NRS 2-40 

Type approval 

TÜV WR 04-399 


Type approval 

TÜV WR 04-399 

H = 1000 mm 

230 V 

40 

3484047 

3223041 

Optional: URB VDU 3381043 

NRS 2-40 optional 

115 V, 50..60 Hz 

Actual value output 4-20 mA 

Second device 

.57 

.59 


NRG 26-40 

NRR 2-40 

H = 1000 mm 

230 V 

40 

3484047 

3225041 

URB VDU 3381043 

NRR 2-40 optional 

115 V, 50..60 Hz 

Actual value output 4-20 mA 

Output for continuous controller 4-20 mA 

Optional: URZ 40a 

CANbus-Interface 


.57 

.58 

91 

B


Where formerly two devices were required, 

all you need now is just a single 

Spectorcompact. As a combined level 

electrode and controller, it presents the 

economical alternative for monitoring 

liquid levels in small installations and steam 

boilers. 

Since the entire electronic control unit is 

located within the terminal box, the transmission 

path is short and reliability is higher 

than with comparable systems. 

Features and Benefits 


n Patented temperature barrier in cylindrical 

body above electrode flange 

n Terminal box equipped with excess 

temperature fuse (102 °C) 

n Level electrode and controller in one unit 

n Optimum system adaptation thanks to 

modular design 

n No mounting of component parts in control 

cabinet 

– No space requirements 

– No installation 

– No wiring 

– Easy planning 

n No special cable required for wiring 

sensing unit to control cabinet 

Pump Control Units 

92 


System Description 

NRGS 1...-1 

The compact system NRGS 11-1 or NRGS 

16-1 works according to the conductivity 

measurement principle. With the NRGS 1...-1 

a maximum of four levels can be signalled in 

conductive liquids: 



each. 

The NRGS 1...-1 has a level switch integrated 

in the electrode case for the control of all 

functions. An external switching device is not 

required. 

n Simplified logistics 

– Only one item of equipment has to be 

ordered and checked upon receipt 

– Reduced inventory requirements and 

simplified stocking 

– No onerous assignment procedures 

of individual component parts to 

mechanical engineering dept. (boiler) and 

measurement and control 

engineering dept. (control cabinet) 

n Interchanges with old float-operated systems 

since they have their output contacts 

also integrated in the terminal box. 

Standard features Type NRSP 1-11 NRSP 1-12 

Pump protection against running dry 

Pump protection against running dry and high-level alarm – – 

Time-dependent pump switching device – 

Switching-on of stand-by pump – – 

Collective malfunction alarm (visible) 

Collective malfunction alarm (visible and audible) – – 

Volt-free contacts 

Remote level indication – – 


NRGS 1...-2 

The compact system NRGS 11-2, NRGS 16-2 

works according to the conductivity measurement 

principle. With the NRGS 1...-2 a maximum 

of three levels can be signalled in 

conductive liquids: 

n Low-level alarm, pump on, pump off, with 

one normally open contact. 

The NRGS 1...-2 has a level switch integrated 

in the electrode case for the control of all 

functions. An external switching device is not 

required. 

The NRGS 1...-2 has two electrode tips for the 

detection of low-water level. The low-level 

alarm is signalled via two separate switching 

channels. 


NRGT 26-1 

The compact system NRGT 26-1 works 

according to the capacitance measurement 

principle. The NRGT 26-1 is used for 

signalling different levels in conductive and 

insulating liquids. 

n Modulating control ensures that the liquid 

level is always within the predefined 

measuring range of the electrode. 

The NRGT 26-1 has a level transmitter integrated 

in the electrode case which produces 

a standard analogue output of 4 – 20 mA. 

An external switching device is not required.

Compact system for on-off level control with fixed switchpoints 

NRGS 11-1 

NRGS 16-1 

1" 

Compact system for water-level limitation and on-off control 

Reset 

Test 

NRGS 11-2 

NRGS 16-2 

1" 

Compact system for modulating level control 

NRGT 26-1 

¾" 

Pump control 

NRGS 11-1 

1" 

Pump on/off 


Pump off 

Pump on 


Pump off 

Pump on 

Pump on/off 

Low-level alarm (redundancy) 

4 – 20 mA 

100 % 

0 % 

Burner protection 

circuit 




see page 

96 

Control cabinet 

NRSP... 

24 V AC/DC 

KS 92-1 

PLC 

Water-level controller 

with two additional limit 

contacts, power supply 

115/230 V, 50 Hz. 

Low-level alarm and 

liquid level controller, 

power supply 

115/230 V, 50 Hz. 


Control valve 

Pump protection 

Modulating level 

control with current output 

4 – 20 mA, power supply 

115/230 V, 50 Hz. 

Optional for 

two pumps 

Type PN 

Max. 

length 

supplied 

NRGS 11-1 6 1000 

1500 

NRGS 16-1 40 1000 

1500 

Type approval 

TÜV WRB 06-388 

Type approval 

TÜV WR/WB 07-392 

Type approval 

TÜV WR 07-392 

Stock code 

3532048 

3532054 

3533048 

3533054 

Optional 24 V, 50..60 Hz .51 

Type PN 

Max. 

length 

supplied 

NRGS 11-2 6 1000 

1500 

NRGS 16-2 40 1000 

1500 

Stock code 

3532148 

3532154 

3533148 

3533154 

Optional 24 V, 50..60 Hz .51 

Type PN 

Max. 

length 

supplied 

Stock code 

NRGT 26-1 40 300 3481040 

400 3481041 

500 3481042 

600 3481043 

700 3481044 

800 3481045 

900 3481046 

1000 3481047 

1100 3481048 

1200 3481049 

1300 3481050 

1400 3481051 

1500 3481052 

2000 3481053 

Optional 15 V, 50..60 Hz 

.56 

24 V, DC / 50..60 Hz 

.57 

Equipment Stock code 

NRGS 11-1 / NRSP 1-11 3532048 / 3261140 .. .. 

NRGS 11-1 / NRSP 1-12 3532048 / 3261240 .. .. 

L = 1000 mm / H = 1000 mm 


93 

B

Self-Monitoring Low/High-Level Alarms 

– Conventional Design – 

Description 

Low-level limiter 

NRG 16-11 / NRS 1-7 b 

Application and Purpose 

Use self-monitoring low-water limiter with 

periodic self-checking type NRG 16-11 in 

combination with level switch NRS 1-7 in 

steam boilers and hot-water plants. The 

equipment meets the German regulations for 

use in steam boiler plants operating without 

constant supervision (TRD 604 sheet 1 

and 2). 

For boiler operation acc. to TRD 604 two selfmonitoring 

low-level limiters are required and 

for boiler operation to TRD 602 only one selfmonitoring 

low-level limiter is necessary. 

The level electrode NRG 16-11 can be combined 

with the following GESTRA systems: 

High-Level Alarms 

Description 

“Conventional Design” 

NRG 16-4 / NRS 1-2 


Use in combination with level switch 

NRS 1-2 for water-level limiting (low-level 

alarm), on-off liquid control and signalling 

of levels of conductive liquids. The stainless 

steel design is particularly suited for aggressive 

fluids. For vessels and steam boilers up 

to PN 40 with level switch in accordance with 

TRD 604 (boiler operation without constant 

supervision). 

Sensing unit for high-level alarm and level 

control. 

Design 

The level electrode NRG 16-4 is available with 

screwed connection 3/8" BSP 

Material: X6CrNiMoTi17-12-2 

(DIN no. 1.4571) 


Type Pressure rating End connection 

94 

n NRG 26/NRR 2-2 (modulating level control) 

n NRG 26/NRR 2-1 (modulating level control) 

n NRG 26/NRS 2-1 (on-off level control) 

n ER 56/NRS 1-5 (on-off level control) 

n NRG 16-4/NRS 1-2 (high-level alarm) 

n NRG 16-12/NRS 1-8 

(self-monitoring high-level alarm) 

The level electrode NRG 17-11 can be 

combined with the following GESTRA systems: 


The level electrode NRG 19-11 can 

be combined with the following GESTRA 

systems: 


The installation of two low-level alarms in one 

standpipe is not permissible according to TRD. 

The electrodes are supplied in different 

lengths (see data sheet). For switching levels 

between these dimensions the electrode tip 

can be cut to length as required. Wiring to the 

electrode is effected by a four-pole connector. 

“Self-Monitoring” 

NRG 16-12 / NRS 1-8 


Use in combination with level switch 

NRS 1-8 as self-monitoring high-level alarm 

with periodic self-checking according to 

TRD 604 sheet 1 and 2 for high-water level 

detection (high-level alarm) in steam and 

pressurized hot-water boilers. 

Design 

The high-level limiting system comprises level 

electrode NRG 16-12, NRG 17-12 or 

NRG 19-12 and level switch NRS 1-8. 

Service pressure [bar] / 

Saturated steam temperature 

Low-level limiter and controller 

NRG 16-36 / NRS 1-9 


Level controller and self-monitoring lowwater 

level limiter with periodic self-checking 

feature to be used in conjunction with level 

electrode NRG 16-36 for on-off boiler feedwater 

control, high level detection (alarm) and 

low-water level limiting (min. level alarm). 


boiler installations in accordance with 

TRD 602 and TRD 604, sheet 1 and 2. 

Switching Controller NRS 1-9 b 

Plug-in unit in plastic case for installation in 

control cabinets. The terminals are accessible 

after unplugging the unit from its base. The 

plug-in unit may be snapped onto a 35 mm 

supporting rail or screwed into position on a 

mounting panel. Field enclosures for several 

plug-in units are available on request. 

The level electrodes NRG 16-12, NRG 17-12 

and NRG 19-12 consist of a measuring 

electrode fitted in a body. The electrode is 

insulated by special insulating seals. 

The pressure-tight connection of the electrode 

is effected coaxially with a contact ring and 

a stud. A system of compression springs 

in the electrode body ensures sufficient 

sealing forces at the insulating seals, even 

if temperatures vary. The stud is insulated 

by a PTFE foil. Contact ring and body are 

connected to the four-pole connector base by 

PTFE insulated wires. The level electrode is 

available in various lengths up to 1500 mm. 

Observe mounting instructions (see examples 

of installation). The system (electrode + 

level switch) complies with the regulations 

concerning protection circuits for firing equipment 

of furnaces in accordance with DIN 

57116 / VDE 0116. 

Lengths supplied 

[mm] 


[°C] 

NRG 16-11 PN 40 ¾" 32 / 238 500 – 3000 70 

NRG 16-36 PN 40 1½" 32 / 238 1000 – 1500 70 

NRG 17-11 PN 63 ¾" 60 / 275 500 – 3000 70 

NRG 19-11 PN 160 ¾" 100 / 311 500 – 3000 70 

NRG 111-11 PN 320 1" 180 / 357 500 – 3000 70 

NRG 16-4 PN 40 ³∕8" 32 / 238 500 – 1500 70 

NRG 16-12 PN 40 ¾" 32 / 238 500 – 1500 70 

NRG 17-12 PN 63 ¾" 46 / 260 500 – 1500 70 

NRG 19-12 PN 160 ¾" 100 / 311 500 – 1500 70

Self-Monitoring Low/High-Level Alarms 


Self-monitoring low-level limiter 

Level electrode NRG 16-11 ¾" BSP 

DN 50 mm 


Low level 

Low-level limiter, on-off control and high-level alarm 

Combination electrode NRG 16-36 1½" BSP 

DN 50 mm 


High-Level Alarms – Conventional Design 

High-level alarm (conventional design) 

Level electrode NRG 16-4 3/8" BSP 

DN 50 mm 


High level 

Level control 

Low level 

High level 

Self-monitoring high-level alarm 

Level electrode NRG 16-12 3/4" BSP 

DN 50 mm 


High level 

Level switch 

NRS 1-9 

Level switch 

NRS 1-7 

Level switch 

NRS 1-2 

Level switch 

NRS 1-8 

Burner 

protection circuit 


(pump OFF) 

Burner 

protection circuit 

Pump OFF 

Pump OFF 

0525 

0525 


NRG 16-11, 

NRS 1-7 

NRG 17-11, 

NRS 1-7 

NRG 19-11, 

NRS 1-7 

NRG 111-11, 

NRS 1-7 

Type approval 

TÜV WB 05-354 

EG 01 202 931-B-01-0077 

Type approval 

TÜV WB/WR 04-370 

EG 01 202 931-B-01-0075 

Optional voltages: NRS 1-7, NRS 1-9 

Special voltage: 115 V, 24 V, 50..60 HZ 

Type approval 

TÜV WR 08-302 

Type approval 

TÜV HWS 08-417 

L = 1000 mm 

230 V 

L = 1000 mm 

230 V 

L = 1000 mm 

230 V 

L = 1000 mm 

230 V 

40 

63 

160 

320 

Optional voltages: NRS 1-2, NRS 1-8 

Special voltage: 115 V, 24 V, 50..60 HZ 

3511042 

3232541 

3541042 

3232541 

3571042 

3232541 

3571142 

3232541 


NRG 16-36, 

NRS 1-9 

L = 1000 mm 

230 V 


40 

3581047 

3232841 


NRG 16-4, 

NRS 1-2 

L = 1000 mm 

230 V 

40 

3441241 

3231441 


NRG 16-12, 

NRS 1-8 

NRG 17-12, 

NRS 1-8 

NRG 19-12, 

NRS 1-8 

L = 500 mm 

230 V 

L = 500 mm 

230 V 

L = 500 mm 

230 V 


40 

63 

160 

3521041 

3232741 

3551041 

3232741 

3591041 

3232741 

95 

B

Modulating Level Control 


Description 

Level control 

NRG 26-21/ NRR 2-2e 

This modulating level control system comprises 

the level electrode NRG 26-... and the 

level controller NRR 2-2. 

The level-dependent actual value sensed 

by the electrode is continuously compared 

by the controller with the adjusted setpoint. 

Any deviation is immediately detected and a 

signal is transferred to the motorized feedwater 

control valve in order to regulate the 

flowrate accordingly. 

The level controller is of the proportional type 

and provided with a manual control facility. 

In addition it features a signal for high-level 

alarm, first low-level alarm and a current 

output for the display unit URA used for 

remote level indication. 

The switchpoints are adjustable within the 

whole measuring range of the level electrode. 

96 

Level control 

NRG 26-21/ NR. 2-1 

This water-level controller is to be used in 

conjunction with one level electrode 

NRG 26-... and one limit switch NRS 2-1. 

A second max.-min. limit switch enables 

establishing additional switchpoints such as 

high level alarm and first low-level alarm. 

Using level transmitter NRT 2-1 and display 

unit URA makes remote level indication 

possible. 

The advantage of this switching controller 

lies in customized switchpoints which 

can be adjusted during operation and the 

simultaneous use of several control units. 

Level control 

LD 144 / KS 92-1 

Used in conjunction with µP controller type 

KS 92-1 for modulating water level control 

(pressure range > PN 40). 

The intelligent buoyancy transmitter works 

on the Archimedean buoyancy principle. The 

buoyancy is proportional to the liquid level 

and transformed by the measuring transducer 

into the standard output signal 4...20 mA. 

Level control 

705 / KS 92-1 

Used in conjunction with µP controller type 

KS 92-1 for modulating water level control 

(pressure range > PN 40). 

Can also be used as combination electrode 

together with limiters. The 705 is a radarbased 

level transducer. The reflexion time is a 

function of the level and will be transformed 

into a 4...20 mA standard output signal by the 

measuring transducer.

Modulating Level Control 


Modulating control with adjustable switchpoints 

Level probe 

NRG 26-21 

Pressure rating PN 40 

Control valve with isolating bypass valve, strainer, non-return valve and 

feedback potentiometer 


RK 

On-off control with adjustable switchpoints 


Control valve V 725 

GAV 36 GSF GAV 36 

GAV 36 with throttling plug 

Remote level 

indicator URA 2 

High-Pressure Level Control / Pump Control 

Continuous level monitoring for high-pressure applications 

LD 244 

(705) 

Level probe 

NRG 21-11 

DN 50 mm 


High level 

Level control 

Low level 

DN 50 mm 


50 % 

High level 

Pump OFF 

Pump ON 


alarm 


NRR 2-2 

Level transmitter 

NRT 2-1 

100 % 

0 % 

4..20 mA 


V 725 

KS 92-1 

PLC 



Limit switch NRS 2-1 



Limit switch NRS 2-1 

Pump OFF 

Pump ON 

Remote level 

indicator URA 2 



Continuous level monitoring by means of intelligent 

buoyancy transmitter, output 4-20 mA, compl. with 

cover flange kit. 

Equipment Stock code 

NRG 26-21 L = 1000 mm 3452147 

NRR 2-2e 230 V 3241343 

URA 2 230 V 3311344 

Type approval 

TÜV WR 06-320 

Equipment Boiler capacity t/h DN 

3 x GAV 36, 

Control valve V 725, 

GSF, RK 

230 V, 50 Hz 

For other nominal sizes refer to pages 

GAV 74 

GSF 72 

RK 32 – 43 

V 725 66 

Optional voltages: NR. 2-., URA. 

Special voltages: 115 V, 24 V, 50..60 HZ 

< 2.5 20 

< 8.0 40 

< 16.0 50 

< 28.0 65 

Equipment Bestell-Nr. 

NRG 21-11 H = 1000 mm 3421247 

NRS 2-1 230 V 3231741 

NRT 2-1 230 V 3301441 

URA 2 230 V 3311344 

Type approval 

TÜV WR/WS 04-317 


Type PN Design Measuring range 

LD 244 

24 V, DC 

100 DN 80 

DIN 3526 

Form E 

160 DN 80 

DIN 2696 

Form L 

Type approval TÜV WRS 06-324 

705 

24 V, DC 

100 DN 50 

DIN 2696 

Form E 

160 DN 50 

DIN 

Form E 

Approval GL/Stoomwezen 

350 

500 

1000 

350 

500 

1000 

600 

800 

1000 

600 

800 

1000 

97 

B

Accessories for Liquid-Level Alarms Fitted 

in External Level Control Pots 

Description 

Level pot for external installation of 


Stop Valve GAV 

Purpose 

For isolating and throttling non-corrosive and aggressive gases, steam 

and liquids, e. g. air, steam, gas, oil etc. in all industries. 

GAV Features 

n With stuffing box 

n Detachable locking device for all sizes 

n Optional limit switch(es) 

Y-type drain valve 17/213 

Type code of level pots 

Feature Value Designation MF 206-1STT 118 P / 214 P / 312 G > 

Component Level pot MF 

 

Design: 1 Side connection 10 

(side connection) 2 Side connection 20 

4 Side connection 90°r 40 

4 Side connection 90°l 41 

4 Side connection 180° 42 

4 Side connection 90°R+90°L 60 

Nominal pressure PN 16 4 

PN 40 6 

PN 63 7 

PN 160 9 

Size 88.9 1 

114.3 2 

Material Steel type ST 35.8 S 

High-temperature steel 15 MO 3 W 

Austenitic A 

In accordance with AD-Bulletin A 

TRD T 

Others S 

Approved by TÜV T 

Works inspector W 

Others S 

Connection 

(N 1) 

3/4" BSP 

1" BSP 

114 G 

115 G 

11 /4" BSP 116 G 

11/2" BSP 117 G 

DN 50 mm 118 P 

DN 80 mm 120 P 

DN 100 mm 121 P 

Boiler connection DN 15 mm 212 P 

(N 2) DN 20 mm 214 P 

DN 25 mm 215 P 

DN 50 mm 218 P 

Drain connection 

(N 3) 

1/2" BSP 

DN 20 mm 

312 G 

314 P 

DN 25 mm 315 P 

Side connection 3 + 4 DN 20 mm 414 P not required in this example 

(N 4) DN 25 mm 415 P 

Side connection 5 + 6 DN 20 mm 514 P not required in this example 

(N 5) DN 25 mm 515 P 

Additional specification 

Centre distance 1500 ME 1500 Centre distance ME = 1500 mm 

Length (top) e. g. 230 Spec. > Length (top) = 230 (not < 190 mm) 

Length (bottom) e. g. 170 Spec. > Length (bottom) = 170 (not < 140 mm) 

Volume 11 l Spec. > 11 l 

Serial no. 12345 to 123460 Spec. > Serial no. = 123456 to 123460 

98 

 

Additional equipment for the installation of 

liquid-level alarms 

SRL-63 

Purpose 

In combination with external low-level alarms for monitoring the 

periodic purging of level pots or, generally, as timer for monitoring any 

periodic function. 

Particularly suitable for steam plant operation to TRD 602/604. 

Design 

All-electronic logic unit SRL-63 for continuous monitoring, with three 

LEDs (stand-by, purging, switching off) with case for mounting on walls. 

Operation 

The monitoring equipment with Mini-PLC periodically activates a 

memory for a defined period of time. During this period the memory 

registers all functional operations, e. g. purging of the level pot. If this 

signal is not received within the fixed period, the plant is shut down. 

The plant is also shut down if the purging process lasts for more than 

five minutes.

Accessories for Liquid-Level Alarms Fitted 

in External Level Control Pots 

Accessories for liquid-level alarms fitted 

in external level control pots 

GAV 

GAV 

Accessories for high-integrity level controls fitted 

in an external level control pot 

SRL 63 

SRL 6-40 

GAV 

GAV 

GAV 

GAV 

NRG 

NRS 1-40 

GAV 

NRS 1-7 

Accessories for high-integrity level controls fitted 

in an external level control pot 

– Bus based – 

GAV 

NRG 26 

Flange 

DN 

50 mm 

Level 

pot 

NRG 

Flange 

DN 

50 mm 

Level 

pot 

GAV 

Flange 

DN 

100 mm 

Level 

pot 

Type PN 

MF 2061 STT 1) 

GAV 36, DN 20 

17/213, 1/2" BSP 

MF 2071 STT 2) 

GAV 136, DN 25 

MF 2091 STT 2) 

GAV 136, DN 25 

MF 2091 WTT 2) 

GAV 136, DN 25 

More measuring pots see page 119 

Pressure/Temp. Ratings 

Pmax tmax 40 32 bar 238°C 

63 60 bar 275°C 

160 75 bar 290°C 

160 

1) Approval acc. to PED 97/23/EC, module A1 

2) Approval acc. to PED 97/23/EC 

Type DN / PN 

MF 2061 STT 1) 

GAV 36-II 

GAV 36-I 

SRL 63 

MF 2071 STT 2) 

GAV 136-II 

GAV 136-I 

SRL 63 

MF 2091 STT 2 ) 

GAV 136-II 

GAV 136-I 

SRL 63 

MF 2091 WTT 2 ) 

GAV 136-II 

25 / 160 

GAV 136-I 

SRL 63 

1 ) Approval acc. to PED 97/23/EC, module A1 

2 ) Approval acc. to PED 97/23/EC 

Type PN / PN 

MF 2062 STT 1) 

GAV 36-II 

GAV 36-I 

SRL 6-40 

MF 2072 STT 2) 

GAV 136-II 

GAV 136-I 

SRL 6-40 

MF 2092 STT 2 ) 

GAV 136-II 

GAV 136-I 

SRL 6-40 

MF 2092 WTT 2 ) 

GAV 136-II 

25 / 160 

GAV 136-I 

SRL 6-40 

1 ) Approval acc. to PED 97/23/EC, module A1 

2 ) Approval acc. to PED 97/23/EC 

Optional SRL: 

Voltage 115 V, 24 V, 50..60 Hz 

100 bar 

96 bar 

311°C 

300°C 


Pmax tmax 20 / 40 32 bar 238°C 

25 / 63 60 bar 275°C 

25 / 160 75 bar 290°C 

100 bar 

96 bar 

96 bar 

311°C 

300°C 

300°C 


Pmax tmax 20 / 40 32 bar 238°C 

25 / 63 60 bar 275°C 

25 / 160 75 bar 290°C 

100 bar 

96 bar 

96 bar 

311°C 

300°C 

300°C 

99 

B

Level Probes and Control Units for 

Very High Pressure/Temperature Ranges 

Design 

The probe works without any moving parts. 

The probe rod, which is insulated by a 

ceramic tube, is inserted through a hole in the 

probe flange such that pressure-tight sealing 

is ensured. The ceramic tube is closed at the 

lower end and covered by a protection tube. 

The electronic control unit is housed in the 

terminal box. The wiring is effected via a 

6 pole connector with crimp connection. 

NRG 211 

In combination with level switch NRS 2-4 

for indicating high-water level at very 

high pressures and temperatures 

(up to PN 320, 550 °C). 

Application in draining systems of conventional 

power stations and high-pressure 

steam boilers. 

100 

Operation 

The principle of capacitance measurement is 

used to sense liquid levels. The probe rod and 

the protection tube form a capacitor, with air 

or the particular liquid being the dielectric. 

In electrically conductive liquids the probe 

insulation serves as dielectric. As the level 

rises or falls, the capacitance of this assembly 

changes, is converted in the integral measuring 

transducer into a signal, and is then fed to 

the associated electronic control unit. 

NRS 2-4 

The level switch NRS 2-4 is an analogue electronic 

amplifier for the capacitance electrode 

type NRG 211. 

In combination with this level electrode the 

unit can detect high water level. In addition, 

the level switch evaluates possible malfunction 

signals coming from the electrode and 

monitors the electrode supply cable and can 

therefore be used as part of a controlled 

draining system in power stations. 

URN 2 

The power supply unit type URN 2 in combination 

with up to four level switches and 

the cycling timer can be used as part of a controlled 

drainage system in power stations or 

for low level indication. 

Example of installation 

Use the PSU type URN 2 only for the power 

supply of a maximum of four level switches 

type NRS 2-4.

Level Control for Very High 

Pressure/Temperature Ranges 

Steam 

line 

Bypass steam trap BK 

NRG 211 

NRG 211 

URN 2 

Type Material PN Stock code 

NRG 211 *) 1.5415 320 200 bar at 450 °C 

320 bar at 120 °C 

1.7380 200 bar at 500 °C 

320 bar at 120 °C 

1.4922 230 bar at 550 °C 

320 bar at 120 °C 

350100130 ≤ DN 100 

350100140 > DN 100 

350100231 ≤ DN 100 

350100241 > DN 100 

350100332 ≤ DN 100 

350100342 > DN 100 

URN 2 3372042 

NRS 2-4 HW 3233142 

*) with welding connection, nuts, bolts and seals for pipes ∅ > DN 100 or < DN 100 

NRS 2-4 

(two) 

NRS 2-4 

(two) 

Control valve ZK 

Malfunction (alarm) 

Control signal 


Malfunction 

(alarm) 


101 

B

Marine Applications 

Level Electrodes and Controls 

Description 

Steam boiler equipment for marine applications 

has to comply with the same requirements 

as those placed on land installations. 

In addition to that further demands regarding 

environmental conditions such as climate, 

vibrations etc. have to be met. 

Self-monitoring low-level limiter 

102 

NRG 16-11S 

DN 50 mm 

DN 50 mm 


The acceptance certificates are to be issued 

by the classification society responsible for 

the ship’s acceptance inspection. 

Self-monitoring low-level limiter and continuous level control 

100 % 

0 % 

4 – 20 mA 

Low level 

NRG 16-38S 

DN 100 mm 


Low level 

KS 92-1 

Level switch 

NRS 1-7 



Level switch 

NRS 1-7 

Burner protection circuit 

Burner protection circuit 

Approvals for marine application 

see page 86. 


NRG 16-11S 1000 mm 40 3511442 

NRS 1-7 230 V, 15s 323254153 

Type PN 

max. 

length 

supplied 

Stock code 

NRG 16-38S 40 779 3582044 

230 V, 50-60 Hz 884 3582045 

989 3582046 

1095 3582047 

1513 3582051 

NRS 1-7 230 V, 15s 323254153 

Optional 

NRG 16-38s, 115 V 50-60 Hz .56 

NRG 16-38s, 24 V AC/DC .55

Marine Applications 

Level Electrodes and Controls 

Self-monitoring limiter and modulating level control 

100 % 

0 % 

2 x LW 

4 – 20 mA 

NRG 16-39 S 

DN 150 mm 


Low level 

KS 92-1 

Compact system for modulating level control 

NRGT 26-1S 

DN 50 mm 

4 – 20 mA 

100 % 

0 % 



Level switch 

NRS 1-7 

KS 92-1 

Modulating level control with 

current output 4-20 mA 

power supply 230 V, 50 Hz. 

Compact system for on-off level control with fixed switchpoints 

NRGS 16-1S 

DN 50 mm 

Pump ON/OFF 


Pump OFF 

Pump ON 


PLC 



alarm 

2 x 

Burner protection 

circuit 



Water-level controller with 

two additional limit contacts, 

power supply 115/230 V, 

50 Hz. 

Type PN 

max. 

length 

supplied 

Stock code 

NRG 16-39 S 40 779 3584044 

230 V, 50-60 Hz 884 3584045 

989 3584046 

1199 3584047 

1513 3584051 

NRS 1-7 2x 230 V, 15s 323254153 

Optional 

NRG 16-39s, 115 V 50-60 Hz .56 

NRG 16-39s, 24 V AC/DC .55 

Type PN 

max. 

length 

supplied 

Stock code 

NRGT 26-1S 40 316 3211452 

230 V, 50-60 Hz 420 3211453 

526 3211454 

631 3211455 

737 3211456 

842 3211457 

947 3211458 

1053 3211459 

1579 3211460 

Optional 

115 V 50-60 Hz .52 

24 V AC/DC .51 

Type PN 

max. 

length 

supplied 

Stock code 

NRGS 16-1S 40 938 3534053 

230 V, 50-60 Hz 1438 3534056 

Optional 

24 V AC .51 

103 

B

GESTRA Equipment for 

Energy Supply Centres 

104 

GESTRA's SPECTORbus Boiler Equipment 

GESTRA offers the world's first control system package 

for energy supply centres working with an open CAN bus 

system, thereby permitting an easy integration into other 

open bus systems.


page 

Temperature Control..........................................................................................................106.–.109 

Conductivity 

Basic.Principles.and.Applications.................................................................................................110 

Technical.Specification................................................................................................................111 

SpECTorbus/compact 

Conductivity/Intermittent.Boiler.Blowdown.........................................................................112.–.113 

Conventional 

Conductivity.Control.with.Manual.or.Automatic 

Temperature.Compensation...............................................................................................114.–.115 

Conductivity.Control.with.Manual.or.Automatic 

Temperature.Compensation.and.Condensate.Monitoring....................................................116.–.117 

Ancillaries:.Tee.Pieces,.Level.Pots.and.Portable.Measuring.Instruments.VRM.....................118.–.119 

Continuous Blowdown Valves ........................................................................................120.–.121 

Intermittent Blowdown programme – Controlled Blowdown Systems .........................122.–.123 

Intermittent Blowdown Valves..........................................................................................124.–.125 

Contamination Detectors for Condensate and process Liquids 

Detecting.ingress.of.oil.in.condensate.systems.and.marine.installations. ..........................126.–.127 

Detecting.ingress.of.acids,.alkalis,.raw.water....................................................................126.–.127 

Digital.indicator.(ingress.of.oil.in.cooling.water).................................................................128.–.129 

Flowmeters...................................................................................................................................130. 

SpECTorcom/control.........................................................................................................131.–.132 

105 

B

Temperature Control 

Bus 

NrS 1-40.1 

Self-monitoring.temperature.switch.with. 

.periodic.self-checking.feature.to.be.used.in. 

conjunction.with.a.resistance.thermometer. 

type.TRG.5-6...and.pre-amplifier.TRV.5-40... 

The.equipment.operates.as.a.safety. 

.temperature.controller,.or.in.conjunction.. 

with.an.external.lock-out.in.accordance.with.. 

DIN.EN.50156.as.a.safety.temperature.limiter.. 

An.alarm.is.given.as.soon.as.the.temperature. 

exceeds.a.preset.limit.value..The.TRV.5-40. 

features.digital.indicators.for.the.actual. 

.temperature.and.switching-off.temperature. 

Technical Data of Temperature Sensor 

Type pN 

106 

Examples of Installation 

.Superheaters.for.steam.boiler.plants. 

.operating.without.constant.supervision. 

(TRD.604). 

.Superheater.cascades.with.up.to.. 

4.steps 

.In.pressurized.hot-water.plants.as.temperature.limiter.for.the.secondary.circuit.in. 

accordance.with.TRD.604.or.12952/..53. 

.Furnaces.in.accordance.with.DIN.30.683. 

up.to.800 °C. 

.Control.systems.for.product.heating.or. 

.cooling 

Screwed 

Connections 

TrV... Welding stub 

pt 100 

Max. 

temperature 

TrS 5-40 

The.MIN/MAx.temperature.switch.TRS.5-40. 

in.combination.with.temperature.sensor.. 

TRG.5-63.and.pre-amplifier.TRV.5-40.serves. 

as.temperature.controller... 

Application.in.steam.boilers,.pressurized. 

hot-water.plants.operating.without.constant. 

supervision.(TRD.604).as.well.as.any.other. 

type.of.heat.generator..The.equipment.raises. 

an.alarm.when.the.preset.MIN/MAx.limit.. 

value.is.attained. 

Ambient 

temperature 

Lengths avail- 

able L [mm] 

TrG 5-63 40 ½" 5-40 – 1 400.°C 100.°C 100.to.400 

TrG 5-64 40 ½" 5-40 – 2 400.°C 100.°C 100.to.400 

Accuracy.class.A 

TrG 5-65 160 – 5-40 form.4 1 540.°C 100.°C 115 

TrG 5-66 160 – 5-40 form.4 1 540.°C 100.°C 140 

TrG 5-67 160 – 5-40 form.4 1 650.°C 100.°C 200 

TrG 5-68 160 – 5-40 form.4 1 650.°C 100.°C 200 

Accuracy.class.A/B 

TrG 5-69 40 ½" CANopen – 1 400.°C 85.°C 160 

TrG 5-70 160 – CANopen form.4 1 540.°C 85.°C 140 

Technical Data of Temperature pre-Amplifier 

Type output Adjustment range Auxiliary power Version performance test TÜV EC 

TrV 5-40 CANopen 650 °C 24.V,.DC a annual 

Technical Data of Temperature Switches / Controllers / Indicators 

Type 

pt 1000 

outputs Control characteristic Mains supply Version performance test in 

Switchpoint 0/4-20.mA MIN MAx ∆.T Standard b c e acc. with DIN 3440 

TÜV 

approval 

NrS 1-40.1 1 – – – – 230.V – – annual 

NrS 1-40.2 1 – – – – 230.V – – – 

TrS 5-40 4 – – 230.V – – – 

EC

Temperature Detection and Control 


Burner 

Steam.boiler 

Temperature.switch.NRS.1-40.1 

pressurized hot-water boiler acc. to EN 12953 

NRS.1-40.1 

Burner 

WB 

STB 

STW 

TC 

URB.2 

TRV.5-40 

pressurized hot-water boiler acc. to TrD 604 

NRS.1-40.1 

WB 

Burner 

NRS.1-40.2 

NRS. 

1-40.2 

STW(B) 

STW(B) 

URB.2 

TC 

TRV.5-40.2x 

Super-. 

heater 

TRS.5-40 

TRS.5-40 

TRV.5-40 

TC 

TC 

Temperature. 

sensor 

TRG.5-... 

0525 

STB. =. Safety.temp..limiter 

STW. =. Safety.temp..controller 

TC. =. Thermocouple 

WB. =. High.level.alarm 


Combination pN Stock code 

pT 100 T.


Conventional 

TrS 5-6 


periodic.self-checking.feature.to.be.used.in. 


type.TRG.5-....... 

The.equipment.operates.as.a.safety. 

.temperature.controller,.or.in.conjunction.with. 

an.external.lock-out.in.accordance.with.. 

EN.14597.as.a.safety.temperature.limiter. 


exceeds.a.preset.limit.value.. 

Use.in.combination.with.a.twin.PT.100.for. 

temperature.indication. 

TrS 5-7 


periodic.self-checking.feature.to.be.used.in. 


type.TRG.5-....... 

The.equipment.operates.as.a.safety.temperature.controller,.or.in.conjunction.with.an. 

external.lock-out.in.accordance.with.. 

EN.50156.as.a.safety.temperature.limiter... 


exceeds.a.preset.limit.value. 

Technical Data of Temperature Sensor 

Type pN 

108 

Examples of Installation 

.Superheaters.for.steam.boiler.plants. 

.operating.without.constant.supervision. 

(TRD.604). 

.In.pressurized.hot-water.plants.as. 

.temperature.limiter.for.the.secondary. 

.circuit.in.accordance.with.TRD.604.or.. 

EN.12952/..53. 

.Furnaces.in.accordance.with.DIN.30.683. 

up.to.1000 °C. 

.Return-temperature.control.acc..to.. 

TRD.604. 

.Control.systems.for.product.heating.or. 

.cooling. 

Screwed 

Connections 

TrS... Welding stub 

pt 100 

Thermocouple 

type K 

TrS 5-8 

The.min./max..temperature.switch.TRS.5-8.. 

in.combination.with.temperature.sensor.. 

TRG.5-53,.TRG.5-54,.TRG.5-55,.TRG.5-57,. 

.serves.as.temperature.controller.according. 

to.EN.14597..Application.in.steam.boilers,. 

.pressurized.hot-water.plants.operating. 

.without.constant.supervision.(TRD.604).as. 

well.as.any.other.type.of.heat.generator... 

The.equipment.raises.an.alarm.when.the. 

.preset.MIN/MAx.limit.value.is.attained. 

Max. 

temperature 

Ambient 

temperature 

Lengths available 

L [mm] 

TrG 5-11 1 ¾" 5-7 – – 2 1000.°C 120.°C 710 

TrG 5-41 160 – 5-7 form.4 – 2 650.°C 120.°C 200 

TrG 5-53 40 ½" 5-6,.5-8 – 1 – 400.°C 100.°C 100.to.400 

TrG 5-54 40 ½" 5-6,.5-8 – 2 – 400.°C 100.°C 100.to.400 

TrG 5-55 160 – 5-6,.5-8 form.4 1 – 540.°C 100.°C 115 

TrG 5-57 160 – 5-6,.5-8 form.4 1 – 540.°C 100.°C 140 

Accuracy.class.B 

Technical Data of Temperature Switches / Controllers / Indicators 

Type 

outputs Control characteristic Mains supply Version performance test in 

Switchpoint 0/4-20.mA MIN MAx ∆.T Standard b c e acc. with DIN 3440 

Temperature 

range 

TÜV 

approval 

TrS 5-6 1 – – – 230.V – – annual 30.°C.to.540.°C 

TrS 5-7 1 – – – 230.V – – annual 0.°C.to.1000.°C 

TrS 5-8 2 – – 230.V – – – 30.°C.to.540.°C 

KS 92-1 3 – PID – 230.V – – – –70.°C.to.620.°C – 

EC



Burner 

Steam.boiler 

Temperature.switch.TRS.5-6 

pressurized hot-water boiler acc. to TrD 604 

TRS.5-6 

TRS.5-6 

TRG.5-5.. 

TRG.5-5.. 

TRG.5-5.. 

Temperature. 

indicator 

Superheater 

TRS.5-8 

Temperature. 

sensor 

TRG.5-54 

0525 


Combination pN Stock code 

pT 100 T..540.°C.to.

Conductivity Monitoring 

Basic Principles · Application 

Function 

All.boiler.water.contains.some.dissolved. 

solids..These.impurities.are.constantly. 

.concentrated.due.to.the.evaporation.process,. 

i..e..the.total.dissolved.solids.(TDS).level. 

.increases..If.the.TDS.level.were.to.exceed. 

the.permissible.maximum.stipulated.by.the. 

boiler.manufacturer,.foaming.and.carry-over. 

would.take.place,.leading.to.contamination. 

of.the.steam.distribution.system..As.a.result,. 

the.operational.reliability.of.the.plant.will.be. 

.impaired,.and.the.boiler.and.steam.system. 

can.be.badly.damaged... 

Effective.blowdown.can.be.provided.by.use. 

of.blowdown.controller.in.conjunction.with. 

.conductivity.electrode.and.continuous.blowdown.valve.BAE.46-211/ball.valve.510. 

Application 

110 

Deposits.of.fine.suspended.solids.forming. 

scale.on.the.heating.surfaces.and.settling. 

at.the.bottom.of.the.boiler.are.the.result.of. 

.residual.hardness.or.an.excessive.phosphate. 

content.within.the.boiler.water..These.scale. 

formations.form.a.heat.insulating.layer,. 

which.means.that.the.heat.transfer.surfaces. 

are.now.subject.to.design.pressure,.but.at. 

.elevated.temperature,.which.in.turn.can. 

cause.deformation.and.even.an.explosion.. 

The.answer.to.this.problem.is.the.use.of. 

.continuous.blowdown.controller.TA.5./.6./.7,. 

solenoid.valve.340.and.intermittent.blowdown. 

valve.MPA.46./.MPA.47./.MPA.110. 

Steam.boilers Boiler.water,.feedwater.and.condensate.monitoring.acc..to.TRD 

District-heating.plants Condensate.monitoring 

Paper.industry Condensate.monitoring 

Pulp.industry Condensate.monitoring 

Catering.kitchens Condensate.monitoring 

Water-treatment.plants Conductivity.monitoring 

Dyeworks Dyebath.monitoring 

Filling/bottling.plants Detection.of.different.products 

Electric.boilers Maintaining.defined.conductivity 

Cooling.towers. Continuous.blowdown.control 

Pickling.baths Quality.monitoring 

principles of Measurement 

Conductivity measurement, 

2-electrode system 

An.alternating.voltage.is.applied.to.two. 

.electrode.tips.(polarization)..The.current. 

flow.is.directly.proportional.to.the.specific. 

.conductivity.of.the.fluid. 

Particularly.suitable.for.pure.fluids. 

.applications.up.to.500.μS/cm.(e.g..steam. 

regenerators,.condensate/feedwater.tanks,. 

steam.generating.units.>.PN.40.etc.). 

Conductivity measurement, 

4-electrode system 

The.4-electrode.method.is.used.in.order.to. 

improve.the.quality.of.the.measuring.result. 

and.to.avoid.polarisation..This.measuring. 

method.separates.the.current-carrying.from. 

the.voltage-carrying.measuring.electrodes,. 

which.means.that.the.measurement.is.performed.without.current.and.therefore.free. 

of.polarisation.and.that.dirt.deposits.can.be. 

compensated.to.a.large.extent.. 

Particularly.well.suited.for.boiler.water.with. 

high.conductivities.(e.g..industrial.steam. 

.boilers.up.to.PN.40). 

Temperature compensation 

(T°.Comp) 

In.plants.with.temperatures.above.25 °C.the. 

influence.of.temperatures.on.conductivity.is. 

an.important.factor.to.be.considered..Due. 

to.electrolytic.dissociation.(desintegration. 

of.a.compound.in.a.solution).conductivity. 

.increases.considerably: 

Degree.of.dissociation.α ≈.3.–.5 %/°C. 

Manual.temperature.compensation.is.suitable. 

for.plants.with.steady.service.temperatures..The.actual.conductivity.is.obtained.by. 

.carrying.out.a.comparison.measurement. 

.(calibration).to.offset.thermal.errors. 

Automatic.temperature.compensation.(ATC). 

is.ideal.for.plants.with.varying.service.temperatures.in.order.to.make.conductivity.values.independent.of.changes.in.ambient.temperatures..The.measured.and.the.indicated.values. 

always.refer.to.25 °C.and.are.constantly. 

compensated.for.changes.in.pressure.and. 

temperature.

Technical Specification 

Conductivity 

Technical Data of Conductivity Electrodes 

Designs 

a.=.Field.case 

b.=.Plug-in.unit.in.plastic.case 

c.=.19".slide-in.unit 

e.=.Case.for.panel.mounting 

Type 

Type pN Connection 

Lrr 1-40 / LrG 16-40 / 

LrGT 17-40 

outputs Main supply 

Design Measuring range 

protection 

switchpoints 0/4.–.20.mA Standard a b c e (recommended) 

3 230.V IP.40 – – – 

0.5.to.10000.µS/cm 

(0.5.to.500.µS/cm) 

TÜV 

approval 

EC 

 

Lrr 1-40 / LrG 16-41 3 230.V IP.40 – – – 100.to.10000.µS/cm 

LrS 1-5 1 – 230.V IP.40 – – 40.to.10000.µS/cm – – 

LrS 1-6 1 – 230.V IP.40 – – – 0.4.to.100.µS/cm – – 

LrS 1-7 2 – 230.V IP.65 – – – 0.5.to.10000.µS/cm – 

Lrr 1-5 1 230.V IP.40 – – – 40.to.10000.µS/cm – – 

Lrr 1-6 1 230.V IP.40 – – – 0.4.to.100.µS/cm – – 

LrT 1-5 – 230.V IP.40 – – – 40.to.10000.µS/cm – – 

LrT 1-6 – 230.V IP.40 – – – 0.4.to.100.µS/cm – – 

KS 90 / LrGT 16-1 / 

LrGT 17-1 

Max. service pressure [bar]/ 

saturation temperature 

Integrated temp. sensor 

Max. admissible ambient 

temp. at terminal box 

2 230.V IP.54./.IP.20 – – – 

Lengths 

supplied [mm] 

20.5.to.10000.µS/cm 

(0.5.to.500.µS/cm) 

TÜV 

approval 

LrGT 16-1 40 1" 32./.238.°C 70.°C 200.–.1000 

LrGT 16-2 40 1" 32./.238.°C 70.°C 180.–.1000 

LrGT 17-1 63 1" 60./.275.°C 70.°C 200.–.1000 

LrG 16-40 40 1" 32./.238.°C 70.°C 200.–.1000 

LrG 16-41 40 1" 32./.238.°C 70.°C 180.–.1000 

LrG 17-40 63 1" 60./.275.°C 70.°C 200.–.1000 

LrG 16-4 40 3 /8" 32./.238.°C – 70.°C 100.–.1200 – – 

LrG 16-9 40 3 /8" 32./.238.°C 70.°C – – 

LrG 12-1 10 1¼" 10./.183.°C 60.°C 56 – – 

LrG 17-1 63 DN.50 60./.275.°C – 70.°C 250 – – 

LrG 19-1 160 DN.50 60./.275.°C – 70.°C 250 – – 

Technical Data of Electronic Control Units 

 

KS 90 / LrGT 16-2 2 230.V IP.54./.IP.20 – – – 100.to.10000.µS/cm 

EC 

111 

B

Conductivity Spector Bus/Compact 

LrG 16-40 / 17-40 

The.conductivity.electrode.LRG.16-40./.17-40. 

.works.acc..to.the.conductivity.measurement. 

principle. 

LrG 16-41 

The.conductivity.electrode.LRG.16-41. 

.features.4.electrodes.working.according.to. 

the.conductivity.measurement.principle. 

The.LRG.16-4x./.17-40.is.designed.for.signalling.the.TDS.value.(conductivity).in.electrically. 

conductive.liquids: 

.Conductivity.permanently.within.predefined. 

control.range.of.the.electrode. 

The.LRG.16-4x./.17-40.is.to.be.used.in.conjunction.with.the.conductivity.controller.. 

LRR.1-40.or.further.system.components.. 

The.conductivity.data.are.transferred.to.the. 

conductivity.controller.or.other.system.components.via.CAN.data.bus. 

112 

Lrr 1-40 

The.conductivity.controller.LRR.1-40.is.used. 

in.conjunction.with.conductivity.electrode.LRG. 

16-40./.17-40.for.conductivity.monitoring.and. 

control..The.conductivity.controller.has.the. 

following.functions: 

.Two.limits.with.one.switchpoint.each.(highlevel.alarm,.low-level.alarm).or.high-level. 

alarm.and.intermittent.blowdown.program. 

.control. 

.Three-position.control.with.predefined.proportional.band. 

.Conductivity.maintained.within.the.control. 

band.defined.by.preset.limits.. 

The.LRR.1-40.features.an.optional.output.for. 

a.standard.signal.4-20.mA..The.conductivity. 

data.are.transferred.from.the.electrode.to.the. 

controller.via.CAN.data.bus. 

UrB 

see page 90 

LrGT 16-1 / LrGT 17-1 

The.compact.system.LRGT.16-1./.17-1. 

.features.2.electrodes.working.acc..to.the.conductivity.measurement.principle.. 

LrGT 16-2 

The.compact.system.LRGT.16-2.features.. 

4.electrodes.working.acc..to.the.conductivity. 

measurement.principle. 

The.LRGT.16-x./.17-1.is.designed.for. 

.signalling.the.TDS.value.(conductivity).in.electrically.conductive.liquids: 

.Conductivity.permanently.within.predefined. 

control.range.of.the.electrode. 

The.LRGT.16-x./.17-1.has.a.conductivity. 

.transmitter.integrated.in.the.terminal.box.for. 

producing.a.standard.signal.4-20.mA. 

KS 90 

The.industrial.controller.KS.90.comes.with. 

a.self-optimising.feature.as.standard..In. 

addition.to.the.controller.output.it.has.also.an. 

integrated.max..limit.value.so.as.to.fulfill.the. 

requirements.of.TRD.604.for.72.hrs.operation.. 

The.setpoint.and.the.actual.value.are.indicated.by.a.LED.display. 

power 05 

The.Power.05.serves.as.a.24.V.DC.power. 

supply.unit.for.the.compact.system.. 

LRGT.16-1./.17-1.

Conductivity Monitoring Spector Bus/Compact 

with Automatic Temperature Compensation 

Automatic continuous blowdown with limit signalling and 

intermittent blowdown – automatic temperature compensation – 

LRG.16-41 

1".BSP 

GAV 

811 

.GAV.811.......MPA.46 

MV 

Spector. 

Bus 

BAE.46-40 

Signalling of max. conductivity value/automatic intermittent blowdown 

– automatic temperature compensation – 

Tee piece 

LRGT.16-2 

4-20.mA 

DN.50 

GAV 

811 

24.V,.DC 

PLC 

LRG.1.-40 

LRGT.1.-2 

= 

~ 

LRR.1-40 

URB.1.(2) 

Power.05 

230.V,.AC 

BAE.46 

or. 

BAE.46-3 

KS.90 

MAx 

M 

0525 

MAx 

0525 

Spector Bus pN Stock code 

LrG 16-41,.600.mm 40 3772946 

Tee piece 50/25". 1 ) 40 147095 

Lrr 1-40 3802241 

UrB 1 3381043 

BAE 46-40 

Conductivity Monitoring with Manual or Automatic 

Temp. Compensation LRG... / LRR 1. (Conventional Design) 

Manual Temp. Compensation 

LrG 16-4 / LrG 12-2 

purpose and Application 

The.conductivity.electrodes.LRG.16-4.and. 

LRG.12-2.are.used.in.conjunction.with.conductivity.switch.LRS.1-5/6 

b.or.conductivity. 

controller.LRR.1-5/6 b.to.sense.continuously. 

the.conductivity.of.process.or.boiler.water. 

Automatic compensation 

LrG 16-9 


The.LRG.16-9.in.conjunction.with.LRS.1-7a. 

monitors.the.electrical.conductivity.as.well. 

as.the.temperature.of.process,.condensate,.boiler.and.feed.water.thanks.to.the. 

.integrated.resistance.thermometer..The. 

system.is.used.for.limit.monitoring.and/or. 

automatic.continuous.boiler.blowdown. 

114 

LrG 17, LrG 19 

I Conductivity monitoring 

In.combination.with.GESTRA.conductivity. 

switch.LRS.for.continuous.TDS.monitoring.of. 

boiler.water..Particularly.suitable.for.steam. 

boiler.operation.without.constant.supervision. 

(TRD.604). 

II Continuous blowdown control 

In.combination.with.GESTRA.blowdown. 

controller.LRR.1-5.and.blowdown.valve. 

.REAKTOMAT.BAE.for.fully.automatic. 

.continuous.and.intermittent.blowdown.control..Accurate.TDS.control.reduces.water. 

.consumption.and.increases.the.operational. 

safety.of.the.installation..An.alarm.is.raised. 

when.the.desired.boiler.water.condition. 

cannot.be.obtained.by.the.control.system.. 

.Automatic.isolation.of.blowdown.line.during. 

boiler.shut-down. 

LrS 1-7a 


Used.in.conjunction.with.conductivity.electrode.LRG.16-9.for.automatically.controlled. 

continuous.boiler.blowdown.and/or.limit. 

monitoring.in.order.to.increase.the.economic. 

viability.and.safety.of.the.plant..Controlled. 

boiler.blowdown.with.temperature.compensated.indication.of.the.electrical.conductivity. 

(TDS.control)..Application.in.steam.boilers,. 

evaporators,.steam.regenerators,.condensate. 

liners.etc.. 

Design 

Plastic.casing.for.wall.mounting.with. 

.indicators.and.adjustors.behind.clear.lid. 

Lrr 1-5 b/Lrr 1-6 b 


For.automatically.controlled.blowdown.to. 

reduce.blowdown.wastage.and.increase. 

safety.in.operation..Use.in.conjunction.with. 

GESTRA.conductivity.electrode.LRG.16-4. 

or.LRG.17/19.as.sensing.unit,.and.GESTRA. 

continuous.blowdown.valve.BAE.as.control. 

valve..Automatic.closing.of.blowdown.line. 

during.boiler.shut-down..Current.output.for. 

remote.indication.or.recording.of.conductivity.. 

Application.in.steam.boilers,.evaporators.or. 

similar.plant,.in.particular.plants.operated. 

automatically,.e..g..in.accordance.with.the. 

regulations.for.operation.without.constant. 

supervision.(TRD.604). 

Design 

Plug-in.unit.in.plastic.case.for.installation.in. 

control.cabinets..The.terminals.in.the.case. 

are.accessible.after.undoing.two.screws. 

and.unplugging.the.unit.from.its.base..To. 

avoid.confusion.with.other.plug-in.units.of. 

the.GESTRA.range,.inserts.are.fitted.in.the. 

bases.so.that.only.the.correct.unit.may.be. 

plugged.into.each.base..The.plug-in.units.may. 

be.snapped.onto.a.35.mm.supporting.rail.or. 

screwed.into.position.on.a.mounting.panel.. 

Field.enclosures.for.several.plug-in.units.are. 

available.on.request.


Temp. Compensation LRG... / LRR 1. (Conventional Design) 

Automatic Continuous Blowdown Control 

– Manual Temp. Compensation – < 275 °C 

LRG.1x 

GAV 

Automatic Continuous Blowdown Control 

– Automatic Temp. Compensation – 

LRR.1-5 

LRG.16-9 

GAV 

LRS.1-7 

BAE.210 

BAE 

URS.2 

4.-.20.mA 

MAx 

MIN 

LRG.17-1 

LRG.19-1 

MAx 

LRG.17-1 

LRG.19-1 

0525 

0525 

Equipment pN Stock code 

LrG 16-4 G. 3 /8".BSP 40 3772245 

Lrr 1-5b 3801441 

UrS 2 3351041 

BAE 46-3.DN.15 3891203 

BAE 46-3.DN.20 3891403 

BAE 46-3 DN.25 3891503 

LrG 17-1 

60.bar.275.°C 

63 3771443 

Lrr 1-5 3801441 

UrS 2 3351041 

BAE 47 25/63 3901500 

LrG 19-1 

60.bar.275.°C 

160 3771743 

Lrr 1-5 3801441 

UrS 2 3351041 

BAE 210 

SE.33.7.x.3.6 

250 3931500 

DN.25.Fl. 393150001 

GAV see pages 74. 

Flanges see price List. 

Tee piece connector for LrG 16-4 see price List. 

Level pots LrG 17-1/19-1 see page 119. 

(optional) 


LrG 16-9 3 /8" 

LrS 1-7 

BAE 46-3.DN.15.mm 

BAE 46-3.DN.20.mm 

BAE 46-3 DN.25.mm 

40 

115 

B


Temperature Compensation LRG... / LRR 1- 5/6 

Manual Temp. Compensation 

LrS 1-5 b, LrS 1-6 b 

Continuous.monitoring.of.the.conductivity.of. 

liquids.with.GESTRA.conductivity.electrodes. 

LRG.16-4,.LRG.17.or.LRG.19..Signalling.of. 

preset.conductivity.limits. 

Application.in.steam.boiler.plants.for.condensate.and.feedwater.monitoring;.for.condensate.monitoring.in.district.heating.plants,.in. 

the.paper.and.pulp.industry.and.in.catering. 

.kitchens;.for.conductivity.monitoring.in.water. 

.treatment.plants;.for.monitoring.of.cooling. 

towers,.for.dyebath.monitoring.in.dye.works. 

116 

Automatic Temp. Compensation 

LrG 12-1 / LrG 16-9 

purpose and Application. 

In.conjunction.with.GESTRA.conductivity. 

transmitter.LRT.1.or.conductivity.switch. 

LRS.1-7a.for.continuous.monitoring.of.the. 

.conductivity.of.liquids,.signalling.of.limit. 

values,.remote.indication.or.recording.. 

Application.in.steam.boiler.plants.for.feedwater.and.condensate.monitoring,.as.well. 

as.in.district.heating.plants,.paper.and.pulp. 

.industries,.catering.kitchens,.for.dyebath. 

monitoring.in.dye.works,.and.for.conductivity. 

monitoring.in.water.treatment.plants. 

Design. 

The.conductivity.electrode.LRG.12-1.is.provided.with.two.electrode.tips.completely.insulated.by.a.PTFE.tubing.except.for.the.free.ends.. 

The.non-insulated.ends.form.together.with.a. 

PTFE.sleeve.a.measuring.cell..The.screwed. 

body.incorporates.a.temperature.feeler... 

A.system.of.compression.springs.ensures. 

pressure-tight.sealing.between.electrode.tips. 

and.body.even.at.varying.temperatures. 

LrG 16-9 


The.LRG.16-9.in.conjunction.with.LRS.1-7a. 

monitors.the.electrical.conductivity.as.well. 

as.the.temperature.of.process,.condensate,.boiler.and.feed.water.thanks.to.the. 

.integrated.resistance.thermometer..The. 

system.is.used.for.limit.monitoring.and/or. 

automatic.continuous.boiler.blowdown. 

LrT 1-5 b, LrT 1-6 b 

Measuring.transducer.with.analogue.current. 

output.used.in.conjunction.with.conductivity. 

electrode.LRG.12-1.for.continuous.monitoring. 

of.liquids,.signalling.of.limits,.remote.indication.or.recording. 

Application.mainly.in.condensate.systems.to. 

detect.any.ingress.of.foreign.matter,.e. g..in. 

steam.boiler.plants.for.monitoring.the.boiler. 

water.or.the.condensate.returned.to.the. 

.boiler.. 

UrS 2-b 


Universal.signalling.of.two.limit.values.as. 

MAx.and.MIN.alarm..Connection.to.a.measuring.transducer.with.current.output.0/4.–.20. 

mA..Application.for.instance.with.GESTRA. 

level.transmitter.NRT.2-1b,.continuous.blowdown.controller.LRR.1-5.b.and.conductivity. 

transmitter.LRT.1-5b/LRT.1-6b. 

Design. 

Plug-in.unit.in.plastic.case.for.installation.in. 

control.cabinets..The.terminals.in.the.case. 

are.accessible.after.undoing.two.screws. 

and.unplugging.the.unit.from.its.base..To. 

avoid.confusion.with.other.plug-in.units.of. 

the.GESTRA.range,.inserts.are.fitted.in.the. 

bases.so.that.only.the.correct.unit.may.be. 

plugged.into.each.base..The.plug-in.units.may. 

be.snapped.onto.a.35.mm.supporting.rail.or. 

screwed.into.position.on.a.mounting.panel.. 

Field.enclosures.for.several.plug-in.units.are. 

available.on.request. 

LrS 1-7a 


Used.in.conjunction.with.conductivity.electrode.LRG.16-9.for.automatically.controlled. 

continuous.boiler.blowdown.and/or.limit. 

monitoring.in.order.to.increase.the.economic. 

viability.and.safety.of.the.plant..Controlled. 

boiler.blowdown.with.temperature.compensated.indication.of.the.electrical.conductivity. 

(TDS.control)..Application.in.steam.boilers,. 

evaporators,.steam.regenerators,.condensate. 

liners.etc.. 

Design 

Plastic.casing.for.wall.mounting.with. 

.indicators.and.adjustors.behind.clear.lid.

Conductivity Monitoring with Manual Temperature 

Compensation LRG... / LRR 1- 5/6 

Manual temperature compensation 

Temperature > 275 °C 

pK 

Sample.valve.unit.followed.by. 

conductivity.electrode.LRG.12-2 

GAV 

Signalling of MAX and MIN conductivity values 

– automatic temperature compensation – 

Conductivity 

electrode 

LRG.12-1 

LRS.1-7 

PK 

BAE.210 

LRR.1-5 

LRG.12-2 

MAx.alarm 

URS.2 

BAE 

.MAx 

.MIN 

Sample valve unit 

>.275.° 

Stock code 

LrG 12-2 

pK-250 pE2A 

3773030 

Lrr 1-5 3801441 

UrS 2 3351041 

BAE 210 DN 25 Fl. 393150001 

GAV see page 74 

– Automatic temperature compensation 


LrG 16-9 40 

LrS 1-7a 

117 

B

Ancillaries: Level Pots and 

Portable Measuring Instruments VRM 

VrM 2 

The.service.case.VRM.2.contains.the.conductivity.meter.GMH.3410..The.GMH.3410.is. 

equipped.with.a.built-in.measuring.cell.which. 

.measures.the.conductivity.of.water. 

Function 

The.GMH.3410.is.suitable.for.conductivities. 

within.a.range.from.0.to.200.mS/cm.. 

Design 

VrM 2 

Plastic.case.with.foamed.plastics.insert.. 

Conductivity.measuring.instrument.GMH.3410. 

with.built-in.measuring.cell. 

118 

VrM 3 

The.service.case.VRM.3.contains.the.conductivity.meter.GMH.3410.and.the.pH.measuring. 

device.GMH.3530. 

The.GMH.3410.is.equipped.with.a.built-in. 

measuring.cell.which.measures.the.conductivity.of.water. 

The.GMH.3530.is.equipped.with.pH.electrode. 

type.GE.100.BNC.and.Pt.100.temperature. 

probe.type.GTF.401..The.electrode.and.the. 

probe.are.plugged.into.the.equipment. 

The.service.case.contains.also.the.handling. 

and.calibration.set.GAK.1400,.consisting.of: 

.5.orange.capsules.for.the.calibration. 

.solution.pH.4.01.and.a.plastic.bottle 

.5.green.capsules.for.the.calibration. 

solution.pH.7.01.and.a.plastic.bottle 

.5.blue.capsules.for.the.calibration. 

solution.pH.10.01.and.a.plastic.bottle 

.1.bottle.3mol.KCL-solution 

.1.bottle.pepsin.cleaning.agent 

Function 

The.GMH.is.suitable.for.conductivities.within. 

a.range.from.0.to.200.mS/cm. 

The.GMH.3530.together.with.the.pH.electrode. 

GE.100.BNC.can.measure.pH.values.from. 

0.00.to.14.00. 

The.temperature.probe.measures.temperatures.between.– 

50 °C.and.+250 °C. 

For.pH.measuring.the.temperature.range.is. 

limited.to.10 °C.to.50 °C. 

Design 

VrM 3 

Plastic.case.with.foamed.plastics.insert. 

Conductivity.measuring.instrument.GMH.3410. 

with.built-in.measuring.cell. 

pH.meas..device.GMH.3530.with.pH.electrode. 

GE.100.BNC.and.temperature.probe.GTF.401. 

Calibration.set.GAK.1400.

Ancillaries: Tee Pieces, Level Pots and 

Portable Measuring Instruments VRM 

Tee pieces for Conductivity Electrodes 

DN.15.–.40.mm 

Boiler 

DN.15.–.40.mm 

BAE 

DN.50.mm 

Boiler 

DN.15.–.40.mm 

BAE 

Level pots for Conductivity Electrodes 

DN.15.–.40.mm 

BAE 

DN.15-40.mm. 

Boiler 

DN.15-40 

BAE 

DN.15-40. 

Boiler 

DN.25.mm 

Boiler 

.connection 

DN.25.mm 

Boiler 

.connection 

DN.25.mm.BAE 

1 ) 

3 /8" 

1 ) 

1" 

DN.25.mm. 

BAE 

DN.50.mm 

Electrode. 

connection 

1 ) Approval acc. to pED 97/23/EC Module A1 60.– 

2 ) please state nominal size (DN) when ordering. 

3 ) Approved in acc. with pED 97/23/EC 299.– 

1" 

1" 

1" 

To.suit.electrode.LRG.16-4 

Material:.C.22.8./.St.35.8 

Pressure.rating:.PN.40 

To.suit.conductivity.electrodes.LRGT.16-1./.LRG.16-40 

Material:.C.22.8./.St.35.8 


MF 1161 STT. 

For.installing.level.electrodes.outside.the.boiler 

LRGT.16-1./.LRG.16-40 

Material:.C.22.8./.St.35.8./.∅ 88.9 


MF 1162 STT. 

For.installing.level.electrodes.outside.the.boiler 

LRGT.16-2./.LRG.16-41 

Material:.C.22.8./.St.35.8./.∅ 139.7 


MF 1171 STT 

To.suit.electrode.type.LRGT.17-1,.LRG.17-40. 

Material:.C.22.8./.St.35.8./.∅ 88.9. 


3MF 88.9. 

To.suit.electrode.type.LRG.17-1/LRG.19-1 

For.continuous.blowdown.valve.BAE 

(automatic.continuous.blowdown.control) 

portable Measuring Instruments for Conductivity + pH Value 

3 ) 

3 ) 

Connections DN . 2 ) Stock code 

15 141873 

20 141874 

25 141875 

40 1) 141876 

15 147093 

20 147094 

25 147095 

40 147096 

Connections DN . 2 ) Stock code 

15 1500632 

20 1500633 

25 1500634 

40 1 ) 1500635 

15 1502520 

20 1502521 

25 1502522 

40 1 ) 1502523 

25 1500989 

PN.63 

25 

PN.160 

25 

1500987 

1500988 

Type Stock code 

VrM 2.....Conductivity 3821040 

VrM 3 ....Conductivity,.temperature.and.pH.value 3821141 

119 

B

Continuous Blowdown Valves 

120 

L 

BA 46, BA 47 

BA 210, BA 211 

L 

L 

ZK 29 

Application 

BA 46, BA 47, BA 210, 

BA 211, ZK 29 

BAE 46, BAE 47, BAE 

210, BAE 211, ZKE 29 

Valve.with.adjustable.stage.nozzle.and.sample.valve.for.continuous.blowdown.of. 

steam.boilers.and.evaporators. 

Valve.with.adjustable.stage.nozzle,.sample.valve,.and.electric.actuator.for.automatically.controlled.continuous.blowdown..Especially.suited.for.boilers.operating. 

without.constant.supervision.(TRD.604). 

pressure/Temperature rating According.to.EN.1092-1.(2001).for:.1.0460.in.accordance.with.PED. 

and.AD.2000.or.A105.according.to.Pressure.Equipment.Directive.(PED). 

Type ratings according to Max. pressure [bar] at [t] = ts/p max 

BA 46 / BAE 46 PN.40.1.0460 EN.1092-1 234/29 

PN.40.A105 EN.1092-1 246/36 

Class.150.A105 ASME.B16.34 198/14 

Class.300.A105 ASME.B16.34 254/42 

BA 47 / BAE 47 PN.63.1.0460 EN.1092-1 257/44 

PN.63.A105 EN.1092-1 271/55 

Class.600.A105 ASME.B16.34 271/55 

BA 210 / BAE 210 PN.250.1.0460 EN.1092-1 344/151 

BA 211 / BAE 211 PN.320.1.7335 EN.1092-1 374/220 

ZK 29 / ZKE 29 PN.160.1.7335 EN.1092-1 336/138 

End connections 

Type Flanged DIN Flanged ANSI Socket-weld Butt-weld 

BA 46 / BAE 46 – 

BA 47 / BAE 47 – 

Dimensions BA 46, BAE 46 [mm] 

Connections DN 15 20 25 32 40 50 

Flanged.DIN L 150 150 160 180 200 230 

Flanged.ANSI.Class.150 L 150 150 160 180 230 230 

Flanged.ANSI.Class.130 L 150 150 160 180 230 230 

Socket-weld L 200 200 200 200 250 250 

Dimensions BA 47, BAE 47 [mm] 

Connections DN 15 20 25 32 40 50 

Flanged.DIN L – – 190 – 220 250 

Flanged.ANSI.Class.600 L – – 216 – 216 250 

Socket-weld L – – 200 – 250 250 

BAE 46, BAE 47 

L L L 

BAE 210, BAE 211 

ZKE 29

Continuous Blowdown Valves 


Chart 1:. BA.46,.BA.47,.DN.15-32 

. BAE.46,.BAE.47,.DN.15-32 

Hot-water.capacity.[kg/h] 

Position.of.control.lever 

Chart 3:. BA.210,.BA.211 

. BAE.210,.BAE.211 

1 ) For relatively small quantities (dotted line in chart) 

use 210 k or 211 k (with special stage nozzle). 

Chart 5:. BAE.210k,.211k 

Chart 2:. BA.46,.BA.47,.DN.40/50 

. BAE.46,.BAE.47,.DN.40/50 

Differential.pressure.[bar] Differential.pressure.[bar] 

Hot-water.capacity.[kg/h] 

Position.of.control.lever 

Chart 4:. ZK.29 

. ZKE.29 

121 

B

Programme-Controlled Blowdown Systems 

Description 

A.short.boiler.blowdown.is.performed.by.quickly.opening.the.blowdown.valve..This.creates.a.short-term.low-pressure.area.around.the. 

blowoff.opening.at.the.bottom.of.the.boiler,.causing.a.suction.effect. 

that.removes.accumulated.sludge.and.sediments.that.have.settled.out. 

in.the.lower.part.of.the.boiler. 

The.suction.effect.of.an.intermittent.blowdown.is.only.effective.at.the. 

moment.when.the.valve.is.being.opened..For.this.reason.the.valve. 

should.only.be.opened.for.approx..2.seconds..Longer.opening.periods. 

waste.boiler.water. 

For.the.closing.process.the.design.of.the.valve.is.of.great.importance.. 

The.closing.force.of.the.spring.of.the.intermittent.blowdown.valves. 

(M)PA.is.increased.by.the.boiler.pressure,.which.means.that.the.valve. 

is.in.a.good.condition.for.breaking.up.any.dirt.particles.settled.on.the. 

valve.seat/plug,.thus.ensuring.a.positive.shutoff.. 

The.service.life.of.the.valve.seat/plug.is.further.increased.by.the. 

pressure.reduction.that.takes.place.in.the.radial.stage.nozzle.installed. 

downstream.of.the.valve..The.time.interval.between.bottom.blowdown.processes.can.only.be.calculated.indirectly.by.taking.the.boiler. 

.efficiency,.the.feedwater.quality.and.the.admissible.boiler.water. 

.quality.into.account. 


Three-Way Solenoid Valve 

Max. service pressure 

[bar] 

Strainer 

122 

Min. differential pressure 

[bar] 

Application 

Type Design Interval time 

Lrr 1-40 

TA 5 

TA 6 

TA 7 

Continuous/intermittent.blowdown.controller.for.installation.in. 

control.cabinet,.with.strainer.and.solenoid.valve 

Cycling.timer.PRS.7.as.plug-in.unit.in.plastic. 

case,.strainer,.solenoid.valve 

Cycling.timer.PRS.7.in.sheet-steel.case,.strainer,.solenoid. 

valve,.all.component.parts.assembled.and.interconnected.on.a. 

mounting.panel 

Cycling.timer.PRS.8.integrated.in.solenoid.. 

valve.plug,.strainer,.solenoid.valve 

Connection protection 

16. 1) min..0.5 ¼".BSP IP.65 

1 ) Max. admissible pressure for diaphragm actuator: 6 bar 

Body 

Material 

Filter 

Connection Mesh size [mm] 

Gun.metal.Rg.5 1.4571 ½".BSP 0.5 

In.steam.boiler.plants.operating.without.constant.supervision... 

Automation.of.intermittent.blowdown.by.generating.electric.pulses. 

to.initiate.a.blowdown.cycle.via.the.GESTRA.rapid-action.intermittent. 

blowdown.valve.MPA. 

If space underneath the boilder is of concern, (M)pAs that can be 

tilted by 45° are available on request. 

pulse duration 

sec 

Mains 

voltage 

a 

Version 

b f 

–. 

1.h.–.120.h. 1.–.60 230.V./.50.Hz. – 

30.min.–.31.5.h. 1.–.63 230.V./.50.Hz. – 

30.min.–.31.5.h 1.–.63 230.V./.50.Hz – 

30.min.–.10.h 0.5.–.10 230.V./.50.Hz – – 

Version 

a. =. Field.case 

b. =. Plug-in.unit.in.plastic.case 

c. =. 19".slide-in.unit 

e. =. Case.for.panel.mounting 

f. =. Integrated.in.solenoid.. 

. . valve.plug 

–. 

–. 

.

Programme-Controlled Blowdown Systems 

Lrr 1-40 

TA 5 

TA 6 

TA 7 

Solenoid. 

valve 

PRS.7 

Pressure.. 

reducing.station 

GAV......MPA 

GAV......MPA 

PRS.8 

LRR.1-40 

Pressure.. 


GAV......MPA 

GAV......MPA 

Strainer 

Strainer 

PRS.7 

Pressure.. 


Strainer 

Pressure. 

reducing.. 

station 

Type DN pN Stock code 

TA 5 3602040 

pressure reducing station 146474 

MpA 46 

Rapid-Action Intermittent Blowdown Valves 

124 

L 

PA 46, PA 47 

L 

MPA 46, MPA 47 

L 

MPA 110 

Application 

pA 46, pA 47, pA 110 Manual.intermittent.blowdown.of.steam.boilers.and.pressurized.hot-water.boilers. 

MpA 46, MpA 47, 

MpA 110 

End Connections 

Automatic,.programme-controlled.intermittent.blowdown.of.steam.boilers.and. 

waste-heat.boilers..Especially.suited.for.boilers.operating.without.constant.supervision.(TRD.604). 

pressure/Temperature rating According.to.EN.1092-1.for:.1.0460.in.accordance.with.PED.and.. 

AD.2000.or.A105.according.to.Pressure.Equipment.Directive.(PED). 

Type ratings according to 

Type Flanged DIN Flanged ANSI Socket-weld Butt-weld 

pA 46, MpA 46 – 

pA 47, MpA 47 – 

pA 110, MpA 110 – 

Dimensions pA 46, MpA 46 .[mm] 

Connection DN 20 25 32 40 50 

Flanged.DIN L 150 160 180 200 230 

Flanged.ANSI.Class.150 L 150 160 180 230 230 

Flanged.ANSI.Class.300 L 150 160 180 230 230 

Socket-weld L 200 200 200 250 250 



Flanged.DIN L – 190 – 220 250 

Flanged.ANSI.CI.600 L – 216 – 216 250 

Socket-weld L – 200 – 250 250 


Max. pressure [bar] 

at [t] = ts/p max 

pA 46 PN.40.1.0460 EN.1092-1 234/29 

MpA 46 PN.40.A105 EN.1092-1 246/36 

Class.150.A105 ASME.B16.34 198/14 

Class.300.A105 ASME.B16.34 254/41 

pA 47 PN.63.1.0460 EN.1092-1 257/44 

MpA 47 PN.63.A105 EN.1092-1 271/55 

Class.400/600.A105 ASME.B16.34 270/54 

pA 110 PN.250.1.7335 EN.1092-1 369/206 

MpA 210 PN.250.A182-F12 EN.1092-1 374/221 

Class.400/600.A182-F12 ASME.B16.34 300/85 

Class.900.A182-F12 ASME.B16.34 326/124 

Class.1500.A182-F12 ASME.B16.34 363/196 


fluid 

MpA... 

Water.or. 

compressed. 

air 

Compressed. 

air 

Max. control 

pressure 

MpA... 


Flanged.DIN L – 410 – – – 

Flanged.ANSI.CI.600 L – 410 – – – 

Flanged.ANSI.CI.900./.1500 L – 440 – – – 

Socket-weld L – 300 – – – 

8.bar 

6.bar

Intermittent Boiler Blowdown 

as a Function of Differential Pressure 


Chart 1:. PA.46,.MPA.46 

. PA.47,.MPA.47 

Hot-water.capacity 

Differential.pressure 

The Benefits of the New GESTrA 

Intermittent Blowdown Valves 

Improved blowdown effectiveness through.integrated.pressure. 

chamber.in.the.outlet.section.of.the.body 

Greater tightness.through.additional.wiper.rings.between.the. 

.packing.seals 

Longer service life.and.availability.through.radial.stage.nozzle. 

downstream.of.the.valve.seat 

Insensitive to waterhammer.through.absence.of.large.body.cover 

reduced wear.through.new.arrangement.of.the.seals.on.the.lowpressure.side 

Consistent implementation of the work safety regulations. 

through.novel.distance.tube 

Quick and easy installation.thanks.to.multifunction.parts 

reduced maintenance and service effort through.additional. 

cup.springs.acting.on.the.compression.spring.and.through.the. 

.possibility.of.tensioning.the.seals.from.outside 

Better checking functionally.through.relief.vent.for.leak.detection. 

from.outside 

Greater convenience.through.innovative.clip.fastening.of.the.hand. 

lever.PA.46/47 

Hot-water.capacity 

Chart 2:. PA.110,.MPA.110 

Differential.pressure 

pA / MpA 110, DN 25 

125 

B

Contamination Detectors 

for Condensate and Process Liquids 

Liquid Monitoring – Detecting Ingress of oil in Condensate Systems and Marine Installations 

purpose 

Continuous.monitoring.of.transparent.liquids. 

to.detect.any.ingress.of.insoluble.foreign. 

.matter.causing.turbidity,.such.as.emulsified. 

oils.and.greases..Measuring.of.turbidity.and. 

.signal.evaluation.for.indication,.recording.and. 

control..Tripping.of.alarms,.control.valves.. 

etc. 

The.oil.turbidity.detector.OR.52/..consists.of. 

a.measuring.sensor.ORG.12/ORG.22.and.the. 

ORT.6,.or.ORG.12.and.the.ORT.7. 


126 

Application 

Condensate.monitoring.in.steam.boilers.to.detect.any.ingress.of.oils.and.greases.in.accordance.with.. 

TRD.604,.EN.12952/..53. 

Monitoring.of.cooling.water,.drinking.water,.condensate.and.beverages.for.turbidity. 

Monitoring.of.cooling.water,.drinking.water,.condensate.and.beverages.for.turbidity.in.hazardous.areas.–.. 

zone.1(on.request). 

Hot-water.monitoring.in.district.heating.plants. 

Filter.and.cooling-water.monitoring.on.ships. 

Continuous.monitoring.of.water.for.the.ingress.of.oil,.in.conjunction.with.oil/water.separators.as.15.ppm.bilge. 

alarm.acc..to.IMO,.MEPC..107.(49). 

Type Sensor pN Connection Material 

Measuring transducer orT 6 

Wall-mounting case, measuring range 0 – 25 ppm 

2 alarm relay outputs (instantaneous/delayed) 

LED bar chart display 

4 – 20 mA current output 

or 52/5 orG 12 10 3 /8". GG.25 

or 52/6 orG 22 10 3 /8". 1.4580 

or 52/5 EX orG 12 10 3 /8". GG.25 

or 52/6 EX orG 22 10 3 /8". 1.4580 

IMo-or 52/7 

Marine 

application 

orG 12 10 3 /8". GG.25 Measuring transducer orT 7 

Field case, measuring range 0 – 25 ppm 

3 signal outputs for alarm 1, alarm 2, purging valve 

Limit alarm 1 and 2, adjustment range between 0 and 15 ppm 

LED and LCD display 

Current output 4 – 20 mA 

2 signal inputs 

Data storage Flashcard 8 MB 

1 GpS input (optional) 

1 pC interface (optional) 

Liquid Monitoring – Detecting Ingress of Acids, Alkalis, raw Water, Dyes, etc. 

purpose 

Monitoring.conductive.liquids.for.contamination.by.foreign.matter.that.increases.the.. 

TDS.concentration;.conductivity.monitoring. 

(TDS.control),.signalling.and.display. 

Technical Data of Conductivity Electrodes 

Type pN Connection 

Application 

For.condensate.and.feedwater.monitoring.in.steam.and.(pressurised).hot.water.plants.to.detect.ingress.of. 

acids,.alkalis,.raw.water,.dyes,.etc. 

Service pressure [bar] 

saturated steam temp. 

Integrated 

temp. sensor 


at terminal 

Lengths 

supplied [mm] 

GL EC 

LrG 12-1 10 1¼". 10./.183.°C 60.°C . 56 – – 

LrG 16-9 40 – 32./.238.°C 70.°C – – – 

LrGT 16-1 

Marine application 

40 1". 32./.238.°C 70.°C 200./.300./.400 – 

Technical Data of Electronic Control Unit/Controller 

Type 

outputs 

switching 0/4.–.20.mA 

Mains voltage 

Standard 

protection 

a 

Design 

b c e 

Measuring range TÜV EC 

LrS 1-7a – 230.V IP – – – – – 

LrT 1-5 – 230.V IP.40 – – – 40.to.10000.µS/cm – – 

LrT 1-6 – 230.V IP.40 – – – 0.4.to.100.µS/cm – – 

UrS 2 – 230.V IP.40 – – – – – –

Contamination Detectors for Condensate Systems 

Condensate monitoring to detect any ingress of oil 

Measuring.transducer.. 

ORT.6 

Delayed.alarm.output 

Sensor. 

ORG.12,.22 

4.–.20.mA 

CANopen.(option) 

Example of a bilge water oil separating system with oil & turbidity detector 

or 52 as 15 ppm oil content alarm 

Condensate monitoring and conductivity monitoring 

LRG.16-9 

LRS.1-7a 

Alarm.output 

Solenoid. 

valve 

Solenoid 

valve 

Three-way. 

control.valve 

Three-way. 

control.valve 

ORT.7 

ORG.12 


or 52/5 4003040 

or 52/6 4003140 

Pneumatic.three-way.. 

control.valve.PN.16,.DN.50.. 

with.pilot.valve 

Type approval 

TÜV WÜF 02- 009 

1500554 

Non-return.valve.DISCO 

rK 86a, SF 20 mbar 

121180182 

PN.40,.DN.50 

Optional 

.60 

CANopen.interface 

Non-return valve see pages 32 – 43 


or 52-7 400... 

Type approval for marine applications 

see page 86 

Optional 

GPS.connection 

PC.interface 


LrG 16-9 

LrS 1-7 

Pneumatic.three-way.. 

control.valve.PN.16,.DN.50.. 

with.pilot.valve 

1500554 

127 

B

Ingress of Oil in Cooling Water Systems 

Digital Indicator 

purpose and Application of oil 

Detector 

The.oil.detector.ORGS.11-2.is.used.for.monitoring.cooling.water.to.detect.any.ingress. 

of.oil..An.alarm.and.control.unit.installed. 

downstream.of.the.detector.will.dump.contaminated.cooling.water,.thereby.preventing.oil. 

contamination.of.the.installation.to.be.cooled. 

The.equipment.detects.all.low-density.matter. 

that.is.insoluble.in.water,.not.emulsified,. 

and.has.a.lower.electrical.conductivity.than. 

water..Antirust.oils,.which.emulsify.in.cooling. 

water,.do.not.trigger.an.alarm.. 

The.output.contact.relays.of.the.contamination.detector.are.self-monitoring.and.of.the. 

normally.closed.type,.and.will.therefore. 

.trigger.an.alarm.in.the.event.of.a.malfunction..Tested.and.approved.by.Germanischer. 

Lloyd..GL.. 

128 


Type pN Connection Material 

orGS 11-2 6 Inlet.E0-15-L C.22.8 

Outlet.E0-12-L/S 

Drain.E0-15-L

Ingress of Oil in Cooling Water Systems 

Digital Indicator 

Cooling-water monitoring with oil detector 

Cooler 

Oil.detector.. 

ORGS.11-2 


orGS 11-2 4041140 

Type approval for marine applications 

see page 86 

129 

B

Flowmeters 

for Steam, Gases and Liquids 

130 

Vortex flowmeter 

Flow computer 

Specially shaped vortex shedder 

Steam-flow measurement 

system for constant 

saturated steam pressure 

consisting.of:. 

Vortex.flowmeter.type.. 

83.WA.and.. 

flow.computer.type.Flow.20 

principle of Measurement 

The.design.is.based.on.the.Kármán.vortex.street.principle.using.a.body.installed.perpendicular.to. 

the.axis.of.the.pipe..The.vortices.generated.in.the.flow.stream.produce.pressure.oscillations.which. 

are.converted.into.electrical.signals.by.a.sensor..The.output.signal.is.then.evaluated.and.processed. 

in.the.flow.computer. 

recommended steam flowrate m · in [kg/h] for Vortex flowmeter 83 *) 

Absolute 

pressure 

[bar] 

DN.20 DN.25 DN.40 DN.50 DN.80 DN.100 DN.150 DN.200 DN.250 DN.300 

1.0 30 45 120 180 480 750 1700 3000 4500 6700 

1.4 40 65 165 250 650 1030 2300 4100 6400 9200 

1.6 45 72 185 290 750 1150 2600 4650 7200 10500 

1.8 50 80 210 320 830 1300 2900 5200 8100 11700 

2.0 60 90 230 350 920 1430 3200 5700 8900 12900 

2.5 70 110 280 440 1130 1700 4000 7050 11000 15900 

3.0 85 130 335 520 1340 2100 4700 8400 13000 18500 

4.0 110 170 440 680 1750 2750 6200 11000 17000 24500 

5.0 135 210 540 850 2170 3400 7600 13500 21000 30500 

6.0 160 250 645 1000 2550 4030 9050 16100 25000 36000 

9.0 235 370 745 1450 3780 5900 13300 23500 37000 53000 

11.0 285 440 950 1790 4580 7150 16100 28500 44000 64000 

14.0 360 560 1150 2250 5780 9030 20300 36000 56000 81000 

21.0 535 830 2140 3350 8550 13400 30100 53500 83000 120000 

31.0 790 1230 3150 4930 12600 19700 44300 78800 123000 177000 

*) For minimum and maximum flowrates see data sheet. 

Installation example of a flowmetering system with tapered pipeline and 

pressure/temperature compensation 


system for fluctuating 

saturated steam pressure. 

(temperature.compensated) 



83.WA,.. 

flow.computer.type.. 

Flow.100.and.. 

temperature.sensor.. 

TRG.5-53,.L.=.160.mm 

3.5.x.D 

5.x.D 

14.x.D 6.x.D 


system for fluctuating 

saturated steam pressure 

(pressure.compensated) 

consisting.of:.. 


83.WA,.. 


Flow.100.and.. 

pressure.transmitter.DRT. 

with.syphon.and.pressure. 

gauge. 


system for superheated 

steam 

(temperature.and. 

pressure.compensated) 



83.WA,.. 


Flow.100,.. 

temperature.sensor.. 

TRG.5-53.and.. 

pressure.transmitter.DRT. 

with.syphon.and.pressure. 

gauge

Control & Visual Display System 

SpECTorcontrol – The operating, Control & Visual Display System 

Description 

The.system.SPECTORcontrol.consists.of.a. 

6.5".or.10.4".colour.infrared.touch.screen. 

PLC,.the.operating.system.WIN.CE4.2,.interfaces.for.Ethernet,.Serial.RS.232,.CANopen,. 

PS/2.keyboard,.Profibus.DP.(optional),.digital/ 

analog.input.and.output.terminals.and.the. 

software. 

Function 

The.SPECTORcontrol.system.integrates. 

.control.and.operating.functions.of.the. 

.individual.SPECTOR.devices.in.one.PLC,. 

which.means.that.stand-alone.components. 

such.as.NRR.2-40,.NRS.1-42.and.URB.can.be. 

dispensed.with..Apart.from.the.actual.control. 

tasks.performed.by.SPECTOR.equipment,. 

additonal.control.functions.(plus.a.three- 

.element.control.function).can.be.implemented.by.means.of.the.five.integrated.control..systems..The.advantage.of.this.new.operating,.control.&.display.unit.lies.in.the.standardised.graphical.user.interface:.The.boiler. 

attendant.does.not.have.to.adapt.himself.to. 

different.user.interfaces..Thanks.to.the.smart. 

input/output.terminals.(2.x.analog.input/output,.10.x.digital.input/output).mounted.on. 

site,.the.data.are.transferred.from.the.PLC.to. 

the.final.controlling.element.via.a.BUS.line.. 

This.approach.offers.considerable.cost.advantages,.also.with.regard.to.boiler.equipment. 

The.interface.permits.the.technicien.to. 

query.not.only.data.concering.water.level. 

and.conditions.(as.detected.by.SPECTORbus. 

equipment).but.also.data.from.various.burner. 

controls.(LAMTEC,.HIMA,.SIEMENS,.HAMWOR- 

TY).and.to.integrate.the.data.into.the.control. 

functions.or.to.visualise.them..All.operating. 

data,.controller.settings.etc..can.be.sent.via. 

Ethernet,.modem.etc..to.service.partners. 

(remote.servicing).or.higher.ranking.control. 

systems.where.parameters.can.be.set,.too. 

Service partner process control level 

office pC 

rS 232 

Ethernet 

SpECTorcontrol 

MoDbus 

profibus 

(opC) 

CANbus 

Visual display of operating data 

Apart.from.various.control.tasks.Spectorcontrol.offers.a.wide.range.of.software.solutions. 

for.the.visual.display.of.water.and.burner. 

data..The.standard.package.comprises: 

. 5.freely.selectable.trend.graph.pairs 

. 5.quantity.protocols 

. 5.maintenance.protocols.for.freely.. 

. selectable.units 

. Malfunction.lists 

Type 

SpECTorcontrol Infrared Touch pLC 

incl..2.DE/DA,.10.AE/AA,.software 

131 

B

GESTRA SPECTOR Family 

SpECTorcom/control Control the Controls 

SpECTorcom SpECTorcontrol 

Higher-level 

control system 

SpECTorcom 

GESTRA.has.taken.the.next.big.step.in.boiler.automation:.as.the.first.manufacturer.worldwide,.GESTRA.is.offering.the.remote.monitoring.of.boiler.systems. 

–.with.Spector.com..No.matter.whether.you.want.to.use.your.company’s. 

intranet,.the.World.Wide.Web,.your.mobile.phone,.palmtop.or.Cassiopeia.–.the. 

.current.operating.data.are.available.anywhere,.anytime..Malfunctions.can.be. 

detected.and.remedied.at.an.early.stage..SPECTORcom.–.another.milestone.on. 

the.road.to.increased.operational.safety. 

132 

office pC, laptop 

Fixed network via modem 

Service partner,supplier 

I/o module 

Higher-level 

control system 

office pC, laptop 

Fixed network via modem 

Service partner,supplier 

I/o module 

SpECTorcontrol 

If.you.want.to.undertake.even.more.complex.control.tasks.such.as.recording. 

trend.and.quantity.curves,.producing.malfunction.or.maintenance.logs.or.interfacing.the.system.with.other.control.systems.then.you.need.the.latest.newcomer.to.the.SPECTOR.family.–.SPECTORcontrol..The.equipment.acquires.all. 

measured.values.arriving.from.the.electronic.sensing.units.and.relays.them.to. 

the.control.centre..There.the.incoming.data.are.combined.in.order.to.establish. 

.higher-level.statements.which.are.displayed.on.a.colour.monitor..Pressure,. 

temperature,.conductivity.etc..will.be.controlled.automatically.

GESTRA pressure equipment is designed, constructed and tested to PED1 ) 97/23/EC and 

AD Bulletin 2000. Pressure equipment of category I, II, III and IV bears the CE marking. 

The Declaration of Conformity certifies that the equipment satisfies the applicable safety 

requirements of the PED. 

Pressure equipment that falls within the scope of article 3 section 3 of the PED is designed 

and manufactured in accordance with what is recognised as sound engineering practice. 

This equipment will not be CE marked but must be accompanied by adequate documentation 

which clearly identifies the manufacturer. 

1 ) PED = Pressure Equipment Directive 

Special Equipment and Vessels for Heat Recovery 

Condensate Recovery and Return System SDR A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 

Open-Type Condensate Recovery and Return Tank SDL 100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135 

Closed-Type Condensate Recovery and Return Tank SDL 130 . . . . . . . . . . . . . . . . . . . . . . . . . . . .136 

Steam-Powered Condensate Return Unit KH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 

Steam-Powered Condensate Return Unit FPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 

Desuperheaters EK, KD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 

Steam Regenerators GRDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 

Feedwater Deaerating Plants NDR, SW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 

Flash Vessels VD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 

Blowdown Receiver (Mixing Cooler) VDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143 

Condensate Dampening Pot ED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 

Air/Steam Driers and Purifiers TD/TP (Steam Separators) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 

Control units with independent controllers or PLC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 – 147 

Questionnaire for preparing offers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 – 155 

Heat exchangers available on request 

Page 

133 

C

Condensate Recovery and Return System 

SDR A 

134 

Condensate tank of rectangular design type SDR A with 

high-pressure centrifugal pump(s) installed next to the tank 

Application 

Condensate tanks are used to collect the 

condensate coming from steam users or 

flash vessels . From the tank the condensate 

is pumped into the feedwater tank by a 

level-controlled pump, in most cases via a 

deaerator . 

Size 

Volume 

[l] 

Optional extras 

Plastic coating type “A” up to max . 130 °C 

Plastic coating type “B” up to max . 95 °C 

Pumping 

capacity [m 3/h] 

1 340 1 

2 550 2 

3 750 3 

4 1000 4 

5 1500 6 

6 2000 8 

7 2500 10 

Vessels in compliance with 

Conformity Assessment Section 3, Paragraph 3 

Tanks and valves made of other materials available on request. 

Other pumping capacities and discharge heads on request. 

Rectangular condensate tank type 

SDR A 

The standard range of rectangular condensate 

tanks is designed for condensate flowrates of 

up to 10 t/h and a max . service pressure 

of 0 .1 bar g . 

Tank made of steel type S235JRG2 

(RSt 37-2), inside: untreated, outside: anticorrosion 

coating with two condensate 

pumps and accessories installed next to 

the tank, e. g. 

bimetal dial thermometer, water-level 

indicator, GESTRA level electrode and control 

for automatic pump operation, non-return 

valves, shut-off valves, high-pressure 

centrifugal pump(s) and pressure gauge . 

Completely assembled and interconnected, 

control cabinet supplied but not mounted . 

Max. condensate temperature 90°C

Open-Type Condensate Recovery and Return Tank 

SD L 100 

Condensate receiver tank of cylindrical design type SD L (S) 

with high-pressure centrifugal pump(s) installed next to the tank 

L = horizontal design; S = vertical design 

Size 

Volume 

[l] 

Max . condensate temperature 90°C 

Pumping 

capacity [m 3/h] 

I 250 1 

II 390 2 

III 850 4 

IV 1370 6 

V 2100 9 

VI 2900 12 

VII 3800 16 

VIII 4500 20 

IX 5900 25 

X 6900 30 


Plastic coating from D = 1000 mm onwards possible: type “A” up to max . 130 °C 

Plastic coating from D = 1000 mm onwards possible: type “B” up to max . 95 °C 

Other valve and tank materials available on request. 


Application 






deaerator . 

Open condensate tank of 

cylindrical design 

type SD L (S) 

The standard range of cylindrical condensate 

tanks is designed for condensate flowrates of 

up to 30 t/h and a max . service pressure of 

1 bar . Higher flowrates available on request . 

Tanks available as horizontal and vertical 

design, made of steel S235JRG2 (RSt 37-2), 

inside: untreated, outside: anti-corrosion 

coating with two high-pressure pumps 

and associated valves and accessories 

installed next to the tank: e. g. 

bimetal dial thermometer, pressure gauge 

assembly, water-level indicator, level 

electrode and control for automatic pump 

operation and non-return valves . 


control cabinet supplied but not mounted . 

135 

C

Closed-Type Condensate Recovery and Return Tank 

SD L 130 

Condensate receiver tank of cylindrical design type SD L (S) with 

horizontal-type centrifugal pump(s) installed next to the tank 

L = horizontal design; S = vertical design 

Size 

136 

Volume 

[l] 

Pumping 

capacity [m 3 /h] 

I 250 1 

II 390 2 

III 850 4 

IV 1370 6 

V 2100 9 

VI 2900 12 

VII 3800 16 

VIII 4500 20 

IX 5900 25 

X 6900 30 


Plastic coating from D = 1000 mm onwards possible: type “A” up to max . 130 °C 

Other valve and tank materials available on request. 


Application 






deaerator . 

Closed condensate tanks 

of cylindrical design 

type SD L (S) 

The standard range of cylindrical condensate 

tanks is designed for condensate flowrates 

of up to 30 t/h and a max . service pressure 

of 4 bar . 

Higher pressure ratings and flowrates 

available on request . 

Tanks available as horizontal and vertical 

design, made of steel boiler plate type 

P265GH (H II), inside: untreated, outside: anticorrosion 

coating with two horizontal-type 

centrifugal pumps and associated valves 

and accessories installed next to the tank: 

e. g. bimetal dial thermometer, pressure gauge 

assembly, magnetically operated liquid level 

gauge, level electrode and control for automatic 

pump operation, safety device, overflow, 

air vent, vacuum breaker, shut-off valves and 

non-return valves . Completely assembled and 

interconnected, control cabinet supplied but not 

mounted .

Steam Powered Condensate Return Tank 

KH 

Size 

Volume 

[l] 

Pumping capacity 

[m 3/h] 

Other tank and valve materials available on request. 

Booster steam 

pressure 

Pump capacity 

[bar] 

KH 13-2 50 2 13 9 .10 

KH 13-3 75 3 13 9 .10 

KH 13-5 100 5 13 9 .10 

KH 13-10 390 10 13 9 .10 

Application 


condensate from steam processors or flash 

vessels . From the tank the condensate is 

returned to the main condensate tank or 

deaerator with the aid of level-controlled 

booster steam . 

Steam-powered condensate return 

unit KH... 

The standard version is suitable for condensate 

flowrates of up to 10 t/h and a max . 

service pressure of 13 bar g . 

Tank made of steel type S235JRG2 

(RSt 37-2) or of P265 GH (H II), inside: 

untreated, outside: anti-corrosion coating . 

Associated valves and equipment such as 

pressure gauge assembly, level electrode and 

control for automatic booster steam supply, 

non-return valves . Completely assembled, 

interconnected and equipped with counterflanges, 

bolts and gaskets . 

137 

C

Steam Powered Condensate Return Tank 

FPS 

138 

Size 

Other tank and valve materials available on request. 

Volume 

[l] 

Max. admissible service pressure 

[barg] 

FPS 11-13 45 13 

FPS 23-13 75 13 

FPS 14-10 100 10 

FPS 14-13 100 13 

For more information on booster steam pressure, capacities and discharge head refer to data sheet. 

Application 


condensate from steam processors or flash 

vessels . From the tank the condensate is 

returned to the main condensate tank or 

deaerator with the aid of level-controlled 

booster steam . 

Steam-powered condensate return 

unit type FPS 14... 

The condensate is returned to the main condensate 

tank with the aid of booster steam, 

without electric power . The standard version 

of the FPS 14 is suitable for condensate 

flowrates of 3,6 t/h and a max . service pressure 

of 13 bar g . 

The discharge capacity decreases with rising 

back pressure . The tank is made of steel type 

S235JRG2 (RSt 37-2) or of P265GH (H II), 

inside: untreated, outside: antirust paint, and 

equipped with non-return valves . 


inclusive of counter-flanges, bolts and 

gaskets .

Desuperheating Plants 

System 1 

Superheated 

steam outlet 

Cooler with 

equipment 

System 2 

Desuperheater 

Water 

level 

control 

Electric temperature 

control 

Electric pressure 

regulation 

Drain 

Injection cooler with fixed jet orifices 

Saturated steam outlet 

Drain 

Water-bath desuperheater 

Cooling 

water 

inlet 

Superheated 

steam inlet 

Pressure reducing station 

Pressure 

reducing 

station 

Cooling water 

Steam inlet 

Pump unit 

Application 

Heating installations in all industries 

Heating of drying calenders in the paper 

industry 

Heating of boiling pans in the foodstuff 

industry 

Heating of cable presses 

Radiant panels for hardware production in the 

electrical industry 

Steam moistening plants in the 

textile industry 


System 1 Injection cooler with 

fixed jet orifices 

The cooling water is injected through special 

jet orifices . The amount is adjusted by a control 

valve mounted upstream of the desuperheater 

. The type and number of nozzles are 

dictated by the operating data . The internals 

of the pipe installed downstream of the 

equipment prevent temperature shocks at the 

external pipe . 

System 2 Water-bath desuperheater 

Superheated steam is injected into the water 

contained in the desuperheater . The heat of the 

superheated steam is given up to the water . The 

steam produced is conducted through steam 

separating units and reaches a steam content of 

more than 98 % . 

Criteria for System Selection 

1 . What is the ratio between minimum and 

maximum steam quantity in the control 

range? 

2 . What is the pressure and the temperature 

of the available cooling water? 

3 . How close must the temperature of 

the desuperheated steam be to that of 

saturated steam? 


Higher pressures, temperatures and steam flowrates available on request. 

Questions concerning 

System Design 

1 . Maximum steam flow at inlet? 

2 . Minimum steam flow at inlet? 

3 . Maximum service pressure? 

4 . Maximum temperature at inlet? 

5 . Standard temperature at inlet? 

6 . Temperature at outlet? 

7 . Saturated-steam temperature? 

8 . Temperature of injected cooling water? 

9 . Injected cooling-water flow? 

10 . Cooling-water pressure at cooler? 

11 . Pump pressure? 

12 . Design pressure? 

13 . Design temperature? 

14 . Length of installation? 

System 1 System 2 

Pressure rating [bar] 32 32 

Maximum temperature [°C] 450 390 

Cooling water pressure above steam pressure [bar] 5 > Steam 

Steam flowrate [t/h] 100 15 

Steam flow ratio 1 : 5 1 : 100 

Set point above saturation temperature [K] 5 – 

139 

C

Steam Regenerators 

Steam regenerator 

Application 

Steam regenerators are used to produce 

saturated steam for a secondary system from 

steam or pressurized hot water . 

Pure steam, without any contaminants that 

might be detrimental to health such as 

hydrazine, is produced . 

Standard Installation 

Steam regenerators with self-acting heating-steam control 

Installation of compact design with manual intermittent/continuous blowdown control, basic equipment, electric feedwater supply control with solenoid valve . 

Technical specifications: Feedwater quality 1) < = 5 µS/cm . Max . heating steam pressure: 6 bar, max . pure steam pressure: 4 bar . 

Type 

140 

Condensate 

Pure steam flowrate 

[kg/h] 

Pure steam 

Steam regenerators with electric heating-steam control 

Installation of compact design with automatic intermittent/continuous blowdown control, basic equipment, electric feedwater supply control with solenoid valve . 

Technical specifications: Feedwater quality 1 ) < = 5 µS/cm . Max . heating steam pressure: 6 bar, max . pure steam pressure: 4 bar . 

Intermittent/continuous 

blowdown 

Steam regenerators are therefore especially 

suited for sterilizing equipment in hospitals, 

steaming and drying chambers in the foodstuff 

industry, and for the production of 

distillates . 

∅ 

[mm] 


[mm] 

Technical Data (standard) 

Heating steam 

Service pressure primary [bar] 32 

Feedwater 

Service temperature primary [°C] 250 

Service pressure secondary [bar] 13 

Service temperature secondary [°C] 200 

Capacity range [kW] 5000 

Feedwater quality 1) [µS/cm] < = 5 

Boiler water quality 1 ) [µS/cm] < = 100 

Steam regenerators for higher pressure/temperature 

ratings and larger capacities on request. 

Max. design pressure/ 

temperature primary 

[bar/°C] 


temperature secondary 

[bar/°C] 

GRDEm-S 1 75 406 2600 13/200 6/200 

GRDEm-S 2 250 508 3500 13/200 6/200 

GRDEm-S 3 450 609 3600 13/200 6/200 

GRDEm-S 4 700 711 3800 13/200 6/200 

Type 

Pure steam flowrate 

[kg/h] 

∅ 

[mm] 


[mm] 


temperature primary 

[bar/°C] 


temperature secondary 

[bar/°C] 

GRDEe-S 1 75 406 2600 13/200 6/200 

GRDEe-S 2 250 508 3500 13/200 6/200 

GRDEe-S 3 450 609 3600 13/200 6/200 

GRDEe-S 4 700 711 3800 13/200 6/200 

1) Recommended conductivity value at 20 °C. EN 285

Feedwater Deaerating Plants 

Technical Data (Standard) 

Max. service 

pressure 

Max. service 

temperature 

Capacity 

range 

0 .5 bar 111°C 0 .5 – 120 m 3/h 

Higher pressures on request 

Materials 

(DIN reference) 

S235JRG2 (RSt 37-2) 

1 .4571 

Residual oxygen 

< 0 .02 mg/l 

Application 

To avoid corrosion damage to steam boiler 

plants, the content of aggressive gases, 

such as oxygen and carbon dioxide, in the 

feedwater must be as low as possible . The 

German Technical Supervisory Association 

(VdTÜV) has issued directives concerning 

boiler feedwater quality which are applied by 

German boiler manufacturers when giving a 

warranty on their boilers . 

Thermal deaeration in addition to chemical 

deaeration is very important for maintaining 

the required feedwater quality . 

Recommendation: 

For quality of soft water: 

Concentration of chloride approx . 50 mg/l 

Conductivity approx . 250 µS/cm 

141 

C

Flash Vessels Type VD 

Flash Vessels Systems Type VD 23 and VD 26 

Condensate 

from H .P . user 

142 

Drain 

Water 

Condensate Flash Vessel 

Flash steam 


Type 

Flash steam outlet 

Application downstream of a 

pressure-relief valve 

Gas balance pipe 

to condensate 

tank 

Pressure relief 

valve 

Hot water 

Boiler 

Service pressure 

[bar] 

Application 

Condensate flash vessel 

Condensate flash vessels can be used in all 

steam plants where condensate from steam 

processors is reduced to a lower pressure, so 

that flash steam is formed by revaporization . 

In the flash vessel the steam is separated 

from the water, and then fed into a lowpressure 

steam system . The condensate 

remaining in the flash vessel is discharged 

into a condensate tank . 

Blowdown flash vessel 

Blowdown flash vessels are used if the flash 

steam formed downstream of continuous 

blowdown valves is to be utilized . 

Blowdown flash-vessel system 

Steam boiler 

from 

feedwater tank 

Service temperature 

[°C] 

Feedwater-tank with deaerator 

Live steam supply 

Continuous blowdown 

valve 

Intermittent 

blowdown 

valve 

Blowdown flash vessel 

Condensate flowrate 

[t/h] 

Blowdown 

receiver 

Blowdown receiver 

In a blowdown receiver the sludge and water 

mixture withdrawn from the boiler by the 

intermittent blowdown valve is separated 

into flash steam and condensate (residual 

blowdown) . 

Pressure-relief valve 

When pressure-relief valves of hot water 

boilers blow off, flash steam is formed which 

is discharged to atmosphere by a blow-off 

line . For reasons of safety, to avoid scalding 

of personnel and damage to equipment by 

hot water discharged through the blow-off 

line, a flash vessel is installed between 

pressure-relief valve and blow-off line where 

steam and water are separated . 

Pulse from intermittent blowdown valve 

Volume 

[l] 

VD 0 .5 – 13 111 – 250 1 .2 – 40 50 – 1400 

Cooling water 

Laugenkühler 

Material 

(DIN reference) 

S235JRG2 (RSt 37-2) / 

P265GH (HII) 

VD 23-0.3 13 200 0 .3 15 S235JRG2 (RSt 37-2) / 

GG 25 

VD 23-1.0 13 200 1 .0 15 

VD 26-0.2 32 250 0 .2 15 P265GH (H II) / 

GS-C 25 

VD 26-0.7 32 250 0 .7 15

Blowdown Receiver (Mixing Cooler) VDM 


Hot water from 

intermittent/ 

continuous 

blowdown, 

overflow 

etc . 

Drain 

Mixed cooled 

water to drain 

Flash steam discharge 

or vent 

Thermostat 

Max. service pressure Max. temperature Capacity range Material 

0 .5 bar 111°C up to 15 t/h 

S235JRG2 (RSt 37-2) 

P265GH (H II) 

1 .4541 

1 .4541 

Cooling water 

Mixing cooler with cooling-water control 

and, if requested, 

additional flash-steam condensation 

Description 

Mixing coolers are blowdown receivers used 

to cool hot waste water that can no longer 

be used for heat recovery and is therefore 

discharged into a pit or drain . 

Application 

Process plants where contaminated, hot 

waste water is being formed . 

Steam boiler plants where the blowdown is 

cooled with untreated water . 

Mixing coolers for vapours . 

143 

C

Condensate Dampening Pot ED 


Service pressure 

144 

Steam trap 

1 .25 bar 

Heat 

exchanger 

Related 

temperature 

Steam main = 3 bar 

Condensate main = 0 .25 bar 

Capacity 

range 

18 bar 250°C up to 15 t/h 

Condensate 

dampening 

pot 

Material 

S235JRG2 / 

P265GH 

Passage or 

door frame 

Volume 

[l] 

4 to 50 

Drain 

connection 

Description 

The condensate dampening pot provides a 

cushioning effect to neutralize waterhammer . 

The condensate is discharged without noise . 

Application 

Outlet 

Condensate Dampening Pot ED 

Steam and condensate systems . 

Inlet

Air / Steam Driers and Purifiers TD/TP 

(Steam Separators) 

Description 

Steam separators are used to remove condensate 

and dirty water carry-over from 

steam . By this means trouble-free operation 

and a long service life of the heat exchanger 

and steam consumer is obtained . 


Steam drier downstream of a steam generator 

Application 

Downstream of steam boilers and steamgenerating 

units . 

Between boiler and superheater . 

In steamlines ahead of steam manifolds . 

In district-heating lines and flash steam lines . 

Pressure rating Nominal sizes DN Materials 

St 37 .0 / St 35 .8 

S235JRG2 (RSt 37-2) 

PN 16 

PN 40 

P265GH (H II) 

PN 63 

15 to 500 mm 

16 Mo 3 

PN 100 

PN 160 

13 Cr Mo 4-5 

V 2 A (1 .4541) 

V 4 A (1 .4571) 

Steam generator 

Steam drier 

(separator) 



Desuperheater 

Steam drier upstream of a heat exchanger 

Steam drier upstream of a turbine 

Upstream of turbines, steam engines, steam 

tools . 

For direct heating with steam . 

In spray-vapour humidifier systems for airconditioning 

plants . 

Steam drier 

(separator) 

Steam drier (separator) 

Turbine 

Heat 

exchanger 

Heat 

exchangers 

145 

C


Pump Controls 

Function 

The pump controls consist of the level sensor 

and the control cabinet with the associated 

accessories such as auxiliary relays, 

contactors, switches, control lamps etc . The 

control cabinets are tested and the wiring is 

effected via a terminal strip, ready for connection 

. 

146 

Design 

Pump controls are divided into two groups: 

systems with fixed digital switchpoints (NRSP 

1-1 .) where the switchpoints are determined 

by the length of the electrode tips, and systems 

with variable switchpoints that can be 

adjusted to the varying process conditions 

(NRSP 2-1) . 

Standard equipment Type NRSP 1-11 NRSP 1-12 NRSP 2-11 NRSP 2-22 

Run-dry alarm – – 

Run-dry and high-level alarms – – 

Time-dependent pump changeover – – 

Connection point for stand-by-pump – – – 

Collective malfunction message (visual) – – 

Collective malfunction message (visual & acoustic) – – 

Volt-free contacts 

Remote level indication – – – 

Programmable logic controller (PLC) 

Function 

The PLC are customised system solutions for 

individual control functions and used in pump 

controls, steam regenerators, desuperheating 

installations, injection coolers, steam driers 

etc . The control systems are based on the 

S7-300 module and feature a malfunction 

log and an Operator Panel that allows the 

user to visualise and parameterise controlled 

systems . A connection to higher ranking 

bus-based control systems or volt-free digital 

signals is available as optional extra . 

Design 

The PLC is based on the Simatic S7-300 and 

consists of a CPU (optional extra: Profibus DP 

interface) and digital and analog input and 

output components . 

To monitor and operate the equipment the 

Operator Panel is designed as line display 

or with full graphical display capability 

for installation in control cabinets . The 

conventional controllers can therefore be 

dispensed with and the variable switchpoints, 

e .g . for the NRSP 2-1, can be adjusted . 

The malfunction log lists and stores all 

malfunction messages, with time and date 

being added .


Pump Control 

NRGS 11-1 

1" BSP 

Pump Control 

NRGT 26-1 

¾" BSP 

PLC System Controls 

digital/ 

analog 

sensor 

inputs 

Interface: Profibus DP 

Operator Panel 


NRSP . . . 


NRSP . . . 

digital/ 

analog 

control 

Optional: 

for two 

pumps 

Optional: 

for two 

pumps 

Combination 

NRGS 11-1 / NRSP 1-11 

NRGS 11-1 / NRSP 1-12 

L = 1000 mm 

Combination 

NRGT 26-1 / NRSP 2-11 

NRGT 26-1 / NRSP 2-22 

H = 1000 mm 

147 

C

Questionnaire for preparing offers for 

GESTRA Condensate Recovery and Return Systems 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Condensate flowrate kg/h 

Condensate temperature °C 

Condensate pressure bar(a) 

Tank design: 

Cylindrical Rectangular Horizontal Vertical 

Condensate pumps: 

Qty . 

Discharge head mWS 

Mains voltage 

Horizontal pump Vertical pump 

Typical Installations 

Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

148 

Open System 

Condensate receiver tank of 

cylindrical design type SD L (S) 

with high-pressure centrifugal 

pump(s) installed next to tank 

L = horizontal design 

S = vertical design 

Closed System 

Condensate receiver tank 

of cylindrical design type 

SD L (S) with horizontal-type 

centrifugal pump(s) installed 

next to tank 

L = horizontal design 

S = vertical design 

Discharge control: 

Level electrode yes no 

Supply options: 

Accessories detached Accessories assembled 

and interconnected 

No accessories 

Condensate tank made of: 

Steel Stainless steel grade 1 .4541 

(X6CrNiTi18-10) 

Stainless steel grade 1 .4571 

(X6CrNiMoTi17-12-2) 

Condensate tank of rectangular 

design type SDR A with high- 

pressure centrifugal pump(s) 

installed next to tank


GESTRA Desuperheating Plants 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Reducing of steam pressure 

yes no 

If yes, Self-acting control Electric 

Electro-pneumatic 

Steam flowrate 

Steam pressure: 

P1 

P2 

P3 

Steam temperature: 

t1 or t2 

t3 


Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

bar/psi upstream of pressure reducing station 

bar/psi downstream of pressure reducing station 

or when no more pressure reduction takes place 

bar/psi downstream of cooling station 

°C upstream of pressure reducing station or 

when no more pressure reduction takes place 

°C downstream of cooling station 

System 1 

Injection cooler with fixed jet orifices 

Cooling fluid: 

P4 bar/psi upstream of cooler t4 °C upstream of cooler 

if not fitted with pump yes no 

Water-bath desuperheater t3 = ts 

Injection cooler t3 = ts + > 5° controllable 

Supply options for water-bath desuperheater: 

Accessories detached Accessories assembled 

Optional equipment: 

High-temperature alarm Excess temperature protection 

Low-water level alarm 

Special requirements concerning cooler: 

Material Steel Stainless steel grade 1 .4571 

(X6CrNiMoTi 17-12-2) 

System 2 

Water-bath desuperheater 

149 

C


GESTRA Steam Regenerators 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Thermal output 

Service data (primary) 

Services data (secondary) 

150 

Medium: Steam Hot water Thermal oil 

Pressure bar/psi Temperature On °C Flowrate kg/h 

Temperature Off °C 

Medium: Steam 

Feedwater 

Pressure bar/psi Temperature °C Flowrate kg/h 

Control (pressure side) Self-acting Electric Pneumatic 

Feedwater control Solenoid valve or motorized valve Feedwater pump 

Application 


Steam regenerator 

Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

Condensate 

Pure steam 

Internittent/continuous 

boiler blowdown 

Heating steam 

Feedwater


GESTRA Deaerating Plants 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Boiler capacity kg/h 

Make-up water flowrate kg/h Temperature approx . °C 

Steam pressure bar(a) 

Service pressure (deaerator) 

Make-up feed control Electric Pneumatic 

Pressure control Self-acting Electric Pneumatic 

Typical Installation 

Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

Condensate 

Boiler 

blowdown 

151 

C


GESTRA Flash Vessel Systems 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Pressure p1 upstream of steam trap at steam user P1 = bar(a)/psi(a) 

(boiler pressure at flash vessel) 

Pressure p2 of flash steam at flash outlet to low pressure system P2 = bar(a)/psi(a) 

Pressure p3 downstream of steam trap after the flash vessel P3 = bar(a)/psi(a) 

Condensate flowrate to flash off m = kg/h 

Flash vessel material für die Entspanneranlage 

Please state all pressure specifications in bara or psia! 


Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

152 

Condensate from 

H .P . user 

P1 

Drain 

Flash-steam outlet 

P2 

Gas balance pipe 

to condensate tank 

P3


GESTRA Blowdown Receiver (Mixing Cooler) 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Hot-water flowrate kg/h 

Hot-water temperature °C 

Hot-water pressure bar(a) 

Cooling-water temperature °C 

Cooling-water pressure bar(a) 


Mixing cooler with cooling-water control and, on request, with additional flash-steam condensation 

Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

Hot water from blowdown, 

overflow etc . 

Drain 

Mixed cooled water to drain 

Flash-steam discharge 

or vent 

Thermostat 

Material 

Steel Stainless steel grade 1.4571 


Application 

Boiler blowdown Other 

Cooling water 

153 

C


GESTRA Heat Exchanger 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Thermal output 

Service data (primary) 


Pressure bar/psi Temperature (in) °C Flowrate kg/h 

154 

Temperature (out) °C 

Material: Steel Stainless steel grade 1 .4571 


Service data (secondary) 


Pressure bar/psi Temperature (in) °C Flowrate kg/h 

Temperature (out) °C 

Material: Steel Stainless steel grade 1 .4571 



Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

Heating steam 

Hot water 

return 

Hot water 

inlet 

Condensate Steam inlet 

Heating circuit supply 

Control Self-acting Electric 

Pneumatic 

Controlled from the condensate side 

Design horizontal tube bundle heat exchanger 

vertical tube bundle heat exchanger 

GESTRA Heat Exchanger controlled from the steam side with constant 

temperature of the secondary circuit 

Condensate outlet 

GESTRA Heat Exchanger controlled from the condensate side as a function of the outside temperature 

and safety shut-down controlled from the steam side 

1 

Heating circuit supply


GESTRA Steam Separator 

GESTRA Fax: ++49 (0) 421 - 35 03-149 

Medium: Saturated steam Superheated steam Air Gas 

Flowrate: m˙ = kg/h V˙ N = Nm 3/h 

Service pressure: p = bara/psia 

Service temperature: t = °C 

Approved pressure: p = barg/psig 

Approved temperature: t = °C 

Inspection and certification: 

Connections: Inlet/Outlet: DN/PN 

Condensate outlet: DN/PN 

Material: S235JRG2 P265GH 16 Mo 3 

(RSt 37-2) (H II) 

1 .4541 1 .4571 

(V2A) (V4A) 

Connection arrangements: 

Please enter: 

Name/Title 

Company Name 

Telephone 

Fax 

E-mail 

Date 

155 

C

156 

Our Mobile Testing Station 

For more information 

please contact 

++49-421-35 03 311. 

The mobile testing station will come directly 

to your plant accompanied by qualified and 

experienced engineers from GESTRA who will 

give practical demonstrations of steam and 

condenstate applications. All we need from you is 

steam, water and electricity.

Academy 

Page 

Technical Advice and Training Seminars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 

Useful Information / Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 

Useful Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 

Information on ATEX Directive 94/9/EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 

Information on Pressure Equipment Directive (PED) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 – 165 

Combined Imperial and S . I . Steam Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166 – 167 

DIN Material Reference Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 

Design of GESTRA Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169 

Technical Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170 

Product Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172 – 177 

157 

D

Technical Advice and Training Seminars 

The GESTRA Academy offers training 

programs and project management 

assistance for technical staff to help 

implement future-oriented and complex 

projects in all fields of steam, condensate 

and process fluid control. 

The tremendously fast progress of technology 

combined with the recent economic developments 

are placing ever greater demands on 

the training and qualification of employees 

and managers alike . A company’s wealth of 

technical knowledge and the know-how of its 

personnel in particular constitute nowadays 

the most important non-material asset of 

an enterprise . In many seminars held over 

the last few years our customers have often 

expressed a keen interest in authoritative 

theoretical and practical support . 

To assist with this objective, the GESTRA 

Academy was set up in order to provide 

comprehensive technical literature and conduct 

workshops, seminars and personalized 

consulting and training programs . 

Our hands-on seminars place great emphasis 

on the exchange of experience and the active 

presence and collaboration of the participants 

. Various practical examples of projects 

already implemented in different industries 

will be considered in order to outline the 

problems involved and their solutions . 

The focus of the training seminars is on the 

following subjects: 

Fundamental principles of steam and 

condensate systems 

Sizing and design of pipework 

Efficient utilization of energy in 

steam systems 

Boiler automation and operation 

(without constant supervision for 72 hrs) 

Sizing of control valves 

and other related topics and practical 

examples . 

158 

GESTRA training seminars are geared to the needs of technical staff working for engineering 

companies, project-, design- and plant engineers, foremen, interested specialists and personnel 

responsible for commissioning, servicing and maintenance . 

The seminar is divided into four main topics: 

Module 1: Steam Basics 

Module 2: Design and Function of Steam Traps 

Module 3: Boiler Plant Operation and Equipment 

Module 4: Sizing of Control Valves 

Objective 

Certificate 

Venue 

Hotline 

Optimization of steam and condensate 

systems for cost-efficient and trouble-free operation 

Solving practical problems, exchanging experience and 

active presence of the participants 

Various installation examples based on actual projects will 

illustrate problems and their respective solutions 

Evaluation of energy-saving measures 

The seminars are rounded off with some practical 

demonstrations given at our in-house testing facilities: 

Open steam system 

Closed steam system 

Transparent testing and demonstration facility 

Steam boiler demonstration facility 

GESTRA Diploma 

GESTRA AG 

Münchener Straße 77 · 28215 Bremen 

Fax ++49 - 421- 35 03 - 142 

Tel . ++49 - 421- 35 03 - 279; - 311 

E-Mail: ihoeft@flowserve .com

Useful Information / Conversions 

Useful Information 

Abbreviations used throughout this catalogue: 

DN – Dimension, nominal . The nominal size of a pipe or fitting in mm or inch, if stated . 

PN – Pressure, nominal . The nominal pressure rating 

(Maximum cold working pressure) in bar . 

∆PMX – Maximum differential pressure (inlet pressure minus outlet pressure) 

PMA – Maximum allowable working pressure 

PMO – Maximum operating pressure 

TMA – Maximum allowable working temperature 

PAMAX – Maximum service pressure 

BSP – British Standard Pipe (DIN ISO 228) 

NPT – American Standard Taper Pipe Thread (National Pipe Tapered) 

Conversions 

In this catalogue the International System of Units (SI) is applied . 

The following conversions into the Imperial System for the units used in this catalogue 

might be useful: 

SI Units Imperial Units Conversion 

bar psi 1 bar = 14 .504 psi 

°C °F 1°F = °C x 9/5 + 32 

kg/h lb/h 1 kg/h = 2 .204 lb/h 

l/s gpm 1 l/s = 13 .22 igpm 

= 15 .85 usgpm 

kv Cv Cv = 1 .13 kv (usgpm) 

Pressure-Temperature Ratings 

It is not possible to give direct conversions between DIN and ANSI ratings, and space 

does not permit a detailed comparison . When selecting valves against specific duties, all service data must be 

fully considered . The following table is provided to guide the reader 

who may not be familiar with the general relationship between DIN and ASME ratings . 

DIN Rating ASME Class Equivalent nominal sizes 

PN 10 

PN 16 

PN 25 

PN 40 

125 lb 

150 lb 

300 lb 

PN 63 

PN 100 600 lb 

900 lb 

PN 160 

PN 250 1500 lb 

PN 320 

PN 400 

2500 lb 

PN 630 

DN 8 mm = 1/4" 

10 mm = 3 /8" 

15 mm = 1/2" 

20 mm = 3/4" 

25 mm = 1" 

32 mm = 1 1/4" 

40 mm = 1 1/2" 

50 mm = 2" 

65 mm = 2 1/2" 

80 mm = 3" 

100 mm = 4" 

125 mm = 5" 

150 mm = 6" 

200 mm = 8" 

DN 300 mm = 12" 

350 mm = 14" 

400 mm = 16" 

450 mm = 18" 

500 mm = 20" 

600 mm = 24" 

700 mm = 28" 

750 mm = 30" 

800 mm = 32" 

900 mm = 36" 

1000 mm = 40" 

1050 mm = 42" 

1200 mm = 48" 

159 

D

Useful Conversions 

MASS 

1 kilogramme, kg = 2 .204 pound, lb 

1 metric ton, tonne = 1000 kilogramme, kg 

LENGTH 

1 foot, ft = 0 .3048 metre, m 

1 inch, in = 25 .4 millimetre, mm 

1 metre, m = 3 .28 foot, ft 

= 39 .37 inch, in 

AREA 

1 square inch, in 2 = 645 .2 square millimetre, mm 2 

1 square metre, m 2 = 10 .76 square foot, ft 2 

= 1550 square inch, in 2 

= 1 .196 square yard, yd 2 

VOLUME 

1 cubic inch, in 3 = 16387 cubic millimetre, mm 3 

1 cubic foot, ft 3 = 0 .0283 cubic metre, m 3 

= 6 .24 imperial gallon, gal 

= 28 .32 litre, l 

1 U .S . gallon, US gal = 0 .833 imperial gallon, gal 

FOR WATER 

1 cubic foot of water weighs 62 .4 pound 

1 imperial gallon of water weighs 10 pound 

1 cubic metre of water weighs 1000 kilogramme 

1 litre of water weighs 1 kilogramme 

PREFIXES 

160 

symbol factor 

tera T 10 12 

giga G 10 9 

mega M 10 6 

kilo k 10 3 

hecto*) h 10 2 

deca*) da 10 

deci*) d 10 -1 

centi*) c 10 -2 

milli m 10 -3 

micro u 10 -6 

nano n 10 -9 

pico p 10 -12 

femto f 10 -15 

atto a 10 -18 

*) These prefixes are not recommended for scientific or 

engineering use . 

PRESSURE 

1 bar = 14 .504 pound-force/sq . inch, lbf/in 2 

= 100 kilonewton/sq . metre, kN/m 2 

= 1 .020 kilogramme-force/square 

centimetre, kgf/cm 2 

1 foot of water = 0 .4332 pound-force/sq . inch, lbf/in 2 

= 0 .8824 inch of mercury, in Hg 

= 29 .87 millibar, mbar 

1 kilogramme-force/sq . = 14 .223 pound-force/sq . inch, lbf/in 2 

centimetre, kgf/cm 2 = 98 .07 kilonewton/sq . metre, kN/m 2 

= 0 .9807 bar 

1 kilonewton/sq .metre, = 0 .145 pound-force/sq . inch, lbf/in 2 

kN/m 2 , (kilopascal, kPa) = 0 .0102 kilogramme-force/square 


= 0 .01 bar 

1 pound-force/sq .inch, = 6 .895 kilonewton/sq . metre, kN/m 2 

lbf/in 2 (psi) = 0 .0703 kilogramme-force/square 


= 0 .0689 bar 

1 standard = 14 .696 pound-force/sq . inch, lbf/in 2 

atmosphere, atm = 1 .013 bar 

1 torr = 1 millimetre of mercury, mm Hg 

= 0 .0193 pound-force/sq . inch, lbf/in 2 

= 1 .333 millibar, mbar 

FLOWRATE 

1 cubic foot/minute, = 1 .698 cubic metre/hour, m 3 /h 

ft 3/min 

1 litre/second, l/s = 13 .22 imperial gallon/minute, gal/min 

= 793 imperial gallon/hour, gal/h 

For Gases 

1 standard cubic = 1 .605 normal cubic metre/hour, 

foot/min, SCFM Nm 3 /h (measured at 1 atm, 0°C) 

(measured at 

1 atm, 60°F) 

DENSITY 

1 kilogramme/cubic = 1 gramme/litre, g/l 

metre, kg/m 3 = 0 .0624 pound/cubic foot, lb/ft 3 

1 pound/cubic foot, = 16 .018 kilogramme/cubic metre, kg/m 3 

lb/ft 3 

ENERGY & POWER 

1 British thermal 

unit, Btu 

= 1 .055 kilojoule, kJ 

1 therm = 105 British thermal unit, Btu 

1 British thermal unit/ 

pound, Btu/lb 

= 2 .326 kilojoule/kilogramme, kJ/kg 

1 kilocalorie, kcal = 4 .187 kilojoule, kJ 

1 kilowatt, kW = 1 kilojoule/second, kJ/s 

= 1 .341 horsepower, hp 

= 0 .948 British thermal unit/second, 

Btu/s

GESTRA Information on ATEX Directive 94/9/EC 

Equipment and protective systems intended for use in potentially explosive 

atmospheres “ATEX” Directive 94/9/EC is a so-called “New Approach” 

Directive which provides the technical requirements to be applied to 

equipment intended for use in potentially explosive atmospheres . 

The Directive has been mandatory in all member states of the EU from 

1 st July 2003 . 

Steam traps: 

Type AK, BK, DK, MK, SMK, TK, UBK, UC (Universal Connector), 

UNA, VK . 

Non-return & check valves: 

Type BB, CB, MB, RK, SBO . 

Self-acting controller: 

Type BW, CW . 

Strainer: 

Type SZ . 

The equipment listed above has been examined regarding its suitability for 

application in potentially explosive atmospheres as defined by Directive 

94/9/EC . 

Based on Annex II, section 1 .3 the equipment does not have its own 

source of ignition and is therefore excluded from the scope of this 

Directive according to Art . 1, Paragraph (3)a) . In compliance with Art . 10, 

Paragraph 3 the equipment is not entitled to bear the CE marking in 

connection with Directive 94/9/EC . Consequently a declaration of conformity 

in accordance with 94/9/EC must not be issued . 

When using the equipment according to its intended purpose as 

specified in the corresponding data sheets and installation instructions 

issued by GESTRA the application of the above-mentioned 

equipment in potentially explosive atmospheres is not limited since 

the equipment does not have its own source of ignition. 

The equipment listed above is suitable for application in the following 

areas: 

Zone 0, 1, 2 (gases) and 20, 21, 22 (dusts) 

Equipment group II 

Category 1, 2, 3 

Note: 

Some of the electrical and non-electrical devices not listed here can be 

used in potentially explosive atmospheres . 

Please contact us if you have questions regarding the use of GESTRA 

equipment not indicated on this page in potentially explosive environments 

. 

Please note that some GESTRA devices – in accordance with the Pressure 

Equipment Directive (PED) and ATEX – bear the CE marking and have a 

Declaration of Conformity . For more information refer to the corresponding 

data sheets and installation instructions . 

161 

D

EC Pressure Equipment Directive (PED) No. 97/23 

CE Marking for GESTRA Series Equipment 

Fluid group 1: hazardous substances, poisonous, flammable 

Fluid group 2: non-hazardous substances, e .g . water, steam, air 

Pressure CL acc . to name plate 

CE 

marking 

yes 

Fluid 

Module Gr. 1 Gr. 2 

Valve / Type Type no. PN/CL 

10/15 20 25 32 40 50 65 80 100 

Size (DN) 

125 150 200 250 300 350 400 450 500 600 700 800 900 1000 1200 

A1 – Steam Traps 

X AK 451 ) 845 40 A3 .3 A3 .3 A3 .3 

X H X BK 15 716 40 CE CE 

X H X BK 15 716 CL300 CE CE 

X BK 15 716 CL150 A3 .3 A3 .3 

X H X BK 27N1 ) 712 40 A3 .3 A3 .3 A3 .3 CE CE 

X H X BK 27N 

712 63 A3 .3 A3 .3 A3 .3 CE CE 

162 

(incl . Fl . CL400/600) 

X BK 28 713, 870 100/CL600 A3 .3 A3 .3 A3 .3 

X BK 29 714, 871 160/CL900 A3 .3 A3 .3 A3 .3 

X BK 36, 36A/7 (Swivel) 707, 846 40/CL300 A3 .3 A3 .3 A3 .3 

X BK 37 719, 717 

63-100/ 

A3 .3 A3 .3 A3 .3 

CL400/600 

BK 36A/7 in conjunction with UC/UCY 

X X BK 451 ) 708 40 A3 .3 A3 .3 A3 .3 

X BK 461 ) 711 40 A3 .3 A3 .3 A3 .3 

X BK 212 715, 872 630/CL2500 A3 .3 A3 .3 A3 .3 

X DK 36A/7 (Swivel) 846 CL300 A3 .3 A3 .3 A3 .3 

X DK 45 877 40 A3 .3 A3 .3 A3 .3 

X DK 47, 57 878,879 63/CL600 A3 .3 A3 .3 A3 .3 

X H X GK 11 750 10/16 CE CE CE CE CE* 

X GK 21 750 16 A3 .3 

X MK 20 720 6 A3 .3 A3 .3 A3 .3 

X H X MK 25/2 729 40 CE CE 

X H X MK 25/2 729 CL300 CE CE 

X MK 25/2 729 CL150 A3 .3 A3 .3 

(X) H X MK 25/2S 734 40 A3 .3 CE CE 

(X) H X MK 25/2S 734 CL300 A3 .3 CE CE 

X MK 25/2S 734 CL150 A3 .3 A3 .3 A3 .3 

X MK 25/2S3 740 40 A3 .3 

X MK 36A/7 (Swivel) 846 CL300 A3 .3 A3 .3 A3 .3 

X MK 35/2S 735 40/CL300 A3 .3 

X MK 35/2S3 736 40/CL300 A3 .3 

X MK 35/3 724 25 A3 .3 A3 .3 

X MK 36/51 749 – A3 .3 A3 .3 

X MK 37/1 881 63 A3 .3 A3 .3 A3 .3 

X MK 45/45A1 ) 725 40 A3 .3 A3 .3 A3 .3 

X NRG 16-19, -27, -28 053 40 A3 .3 

(X) H X TK 23 742 16 A3 .3 CE CE CE 

X H X TK 24 743 25 CE CE CE CE 

X SMK 22 885 10 A3 .3 A3 .3 A3 .3 

X UBK 461 ) 886 40 A3 .3 A3 .3 A3 .3 

X UC, UCY Universal Connector 847 CL300 A3 .3 A3 .3 A3 .3 

X UNA 14 (incl . CL150) 851, 852 25 A3 .3 A3 .3 A3 .3 

X UNA 14P 853, 854 25 A3 .3 A3 .3 A3 .3 

X X UNA 16 855, 856 40/CL150 A3 .3 A3 .3 A3 .3 

X X UNA 16A Stainless steel 857, 858 40/CL150 A3 .3 A3 .3 A3 .3 

X UNA 23 770, 771 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

(X) H X UNA 25 798, 799 40 A3 .3 A3 .3 A3 .3 CE CE 

(X) H X X UNA 261 ) 780, 781 40 A3 .3 A3 .3 A3 .3 CE CE 

X X UNA 26 780 CL150 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

(X) H X X UNA 26h Stainless steel 786 40 A3 .3 A3 .3 A3 .3 CE CE 

(X) H X X UNA 26h Stainless steel 786 CL150 A3 .3 A3 .3 A3 .3 CE CE 

(X) H X X UNA 27h 

(incl . Fl . CL400/600) 

820 63 A3 .3 CE CE 

(X) H X X UNA 27h 820 CL300 A3 .3 CE CE 

H X X UNA 38 791, 792 100 A3 .3 A3 .3 CE CE 

(X) H X X UNA 39 814 160 A3 .3 A3 .3 CE 

(X) H X X UNA 39 (incl . Fl . CL600) 814 100 A3 .3 A3 .3 CE 

X H X UNA Special Type 62 800 16 CE CE CE 

X H X X UNA Special 801 25 CE CE 

X H X X UNA PN 801 25 CE CE 

X H X X UNA Special 804 63 CE CE CE 

X H X X UNA Special 804 40 CE CE CE 

X V 21 .9, 21 .9/K 899, 898 40 CE CE 

X VK 14 041 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

(X) H X VK 161 in conjunction with UC/UCY 

*) DN 150 = PN 10 

in conjunction with UC/UCY 

replaces MK 25/2S DN 25 (734) 

replaces MK 25/2S3 DN 25 (740) 

) 042 40 A3 .3 A3 .3 A3 .3 CE CE 

X VK 16 042 CL150 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

X VKE 16, 26 048 40 A3 .3 A3 .3 A3 .3 

(X) H X VKE 16a 044 40 A3 .3 A3 .3 A3 .3 CE CE 

1 ) incl . Fl . CL300






CE 

marking 

yes 

Fluid 



10/15 20 25 32 40 50 65 80 100 

Size (DN) 

125 150 200 250 300 350 400 450 500 600 700 800 900 1000 1200 

A2 – Check Valves 

X H X X BB 12A / 22A 149 10 CE CE CE CE CE CE CE CE CE CE CE CE CE 

X H X X BB 14A / 24A 149 16 CE CE CE CE CE CE CE CE CE CE CE CE CE 

X H X X BB 15A / 25A 149 25/CL150 CE CE CE CE CE CE CE CE CE CE CE CE 

X H X X BB 16A / 26A 149 40/CL300 CE CE CE CE CE CE CE CE CE CE CE CE CE 

X H X X BB 17A 149 63 CE CE CE CE CE CE CE CE CE 

X 

X 

H 

H 

X 

X 

X 

X 

BB 

BB 

18A 

19A 

149 

149 

100/CL600 

160/CL900 

1. BB DIN- & ASME 

2. DN 800 = ASME 30" 

(DN 750) 

CE CE CE CE CE CE CE CE 

CE CE CE CE 

CE 

X H X X BB 12C / 22C 143 10 CE CE CE CE CE CE CE CE CE CE 

X H X X BB 14C / 24C 143 16 CE CE CE CE CE CE CE CE CE CE 

X H X X BB 15C / 25C 143 25/CL150 CE CE CE CE CE CE CE CE CE 

X H X X BB 16C / 26C 143 40/CL300 CE CE CE CE CE CE CE CE CE CE 

X H X X BB 17C 143 63 CE CE CE CE CE CE CE CE CE 

X H X X BB 18C 143 100/CL600 CE CE CE CE CE CE CE CE CE 

X H X X BB 19C 143 160/CL900 CE CE CE CE 

(X) H X BB 11G / 21G 140 6 A3 .3 CE CE CE CE CE CE CE CE CE CE CE CE CE 

X H X BB 12G / 22G 140 10 CE CE CE CE CE CE CE CE CE CE CE CE CE CE 

X H X BB 14G / 24G 140 16 CE CE CE CE CE CE CE CE CE CE CE CE CE CE 

(X) H X CB 14 138 16 A3 .3 CE CE CE CE CE CE CE CE 

(X) H X CB 24S 132 16 A3 .3 CE CE CE CE CE CE CE CE 

X H X X CB 26 133 40 CE CE CE CE CE CE CE CE CE 

X H X X CB 26a 134 40 CE CE CE CE CE CE CE CE CE 

X MB 14 091 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

X H X X NAF-Check 526520/530 

528520/530 

448 25 CE CE CE CE CE 

X H X X NAF-Check 526620/630 448 40 CE CE CE CE CE CE CE CE CE 

X H X X NAF-Check 526822/832 448 100 CE CE CE CE CE CE CE CE CE CE 

(X) H X X RK 16a 118 40/CL300 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 16b 124 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 16c 117 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 16t 125 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 26a 114 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 29a 109 160/CL . . A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X 1 ) X RK 41 102 16 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X X RK 44 103 16 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X RK 44s 110 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 49 107 160 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X RK 70 095 6 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE 

(X) H X RK 71 100 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE 

(X) H X X RK 76 120 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X X RK 86 101 40/CL300 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X X RK 86a 121 40/CL300 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

X SBO 

11, 

21, 

31 

086, 

088, 

090 

6 A3 .3 A3 .3 

1 ) RK 41, DN 65-100, approved only for liquids of fluid group 1 but not for gases as specified in the PED 97/23/EC. 

163 

D






CE 

marking 

yes 

Fluid 



10/15 20 25 32 40 50 65 80 100 

Size (DN) 

125 150 200 250 300 350 400 450 500 600 700 800 900 1000 1200 

A4 – Self Acting Temperature & Pressure Controller 

(X) H X 5801 270 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) H X 5801 270 25 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE 



(X) H X 5610 274 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE 

(X) H X 5610 274 25 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE 

(X) H X 5610 275 40 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE 

X BW 31 032 25+40+CL150 A3 .3 A3 .3 A3 .3 A3 .3 

(X) H X X BW 31A 033 25+40 A3 .3 A3 .3 A3 .3 CE 

(X) H X X BW 31A 033 CL150 A3 .3 A3 .3 A3 .3 CE 

X1 ) CW 41 035 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

X1 ) X1 DN 15-25 = PN 40 as from 2002 

DN 15-25 = PN 40 as from 2002 

) CW 41/4 035 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

X CW 44 036 25 A3 .3 A3 .3 A3 .3 

X X CW 44k 036 25 A3 .3 A3 .3 A3 .3 

X Clorius L1S 235 16 A3 .3 A3 .3 A3 .3 

X Clorius L2S 235 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

X Clorius L2SR, L3S 235, 239 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

(X) X Clorius L3F 239 10 A3 .3 A3 .3 A3 .3 CE 

X Clorius M1F 236 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

(X) X Clorius M1FB 236 16 A3 .3 A3 .3 A3 .3 A3 .3 CE CE 

(X) X Clorius M2F 236 16 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE 

(X) X Clorius M2FR 236 16 A3 .3 A3 .3 A3 .3 CE CE CE CE CE 

(X) X Clorius M3F 239 16 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE 

(X) X Clorius M3F/M3FM 239 10 A3 .3 A3 .3 CE CE 

(X) X Clorius H1F 237 40 A3 .3 A3 .3 A3 .3 A3 .3 CE CE 

(X) X Clorius H1FB 237 40 A3 .3 A3 .3 CE CE CE CE 

(X) X Clorius H2F 237 40 A3 .3 A3 .3 CE CE CE CE CE CE CE 

(X) X Clorius H2FR 237 40 A3 .3 A3 .3 CE CE CE CE CE CE CE 

(X) X Clorius H3F 239 40 A3 .3 A3 .3 CE CE 

(X) X Clorius G1F 238 25 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE 

(X) X Clorius G1FB 238 25 A3 .3 A3 .3 A3 .3 CE 

(X) X Clorius G2F 238 25 A3 .3 A3 .3 A3 .3 A3 .3 CE 

(X) X Clorius G2FR 238 25 A3 .3 A3 .3 A3 .3 CE 

(X) X Clorius G3F 239 25 A3 .3 A3 .3 A3 .3 CE 

A4 – Control Valves 

X Clorius 

2 .05, 4 .03, 4 .05, 

4 .10, 8 .09, 8 .18 

245 A3 .3 A3 .3 A3 .3 

(X) H X X V725 Foxpak 285, 286 40 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE 

(X)* A1, H X ZK 29 754 40 - 160 A3 .3 A3 .3 CE CE CE CE CE CE 

(X) A1, H X ZK 210 013, 393 250 A3 .3 A3 .3 CE CE CE 

(X) A1, H X ZK 213 – CE CE CE CE CE CE CE CE CE 

(X)* A1, H X ZK 313 757 – A3 .3 A3 .3 CE CE CE CE CE CE 

(X) A1, H X ZK 412 758 – A3 .3 A3 .3 CE 

(X) A1, H X ZK 513 759 – CE CE CE CE CE CE CE 

(X) A1, H X ZK 610, 613 – CE CE CE CE CE CE CE CE CE CE CE 

1 ) for liquid fluids only 

164






CE 

marking 

yes 

Fluid 



10/15 20 25 32 40 50 65 80 100 

Size (DN) 

125 150 200 250 300 350 400 450 500 600 700 800 900 1000 1200 

A6 – Safety Valves 

X B+D X GSV 4421 300 CE CE CE CE CE CE CE CE CE CE CE CE 

X B+D X X GSV 4425 300 CE CE CE CE CE CE CE CE CE CE CE CE 



A7 – Strainer 

(X) A X*) GSF 303 430 16* A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE 

(X) H X X GSF 312 - 317, 319, 320 430 16 - 160 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE 

(X) H X X GSF 332 - 334, 336 - 338 430 16 - 160 A3 .3 A3 .3 A3 .3 CE CE CE 

(X) H X X GSF 341 - 348 430 6 - 25 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE 

(X) H X X SZ 36A 437 40/CL300 A3 .3 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE 

A8 – Stop Valves, Sight Glasses 

(X) H X X GAV 

A3 .3 Not PED relevant or must not be CE-marked 

Not part of GESTRA product range CE 

CE Is declared conform 

14F, 24F, 35F, 

36F, 36 

440 16, 40/25 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE* CE* CE* 

(X) H X X GAV 25F 440 25 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE 

(X) H X X GAV 44F, 46F 440 40/16 A3 .3 A3 .3 A3 .3 CE CE CE CE* CE* CE* CE* CE* CE* 

(X) H X X GSG 405 453 16 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE CE CE CE 

(X) H X X GSG 424 443 16 A3 .3 A3 .3 A3 .3 CE CE CE 

B – Intermittent & Continuous Blowdown Valves – BA, BAE, MPA, PA & Boiler Electronics 

(X) H X X Vortex 83 WA / FA – 110 A3 .3 A3 .3 A3 .3 CE CE CE CE CE CE CE 

X LD 144 – 63-160 A3 .3 

(X) H X BA / BAE 36 015, 388 40 A3 .3 A3 .3 A3 .3 CE 

(X) H X BA / BAE 36 015, 388 CL300 A3 .3 A3 .3 A3 .3 CE 

X BA / BAE 36 015, 388 CL150 A3 .3 A3 .3 A3 .3 A3 .3 

X BA / BAE 210 013, 393 250 A3 .3 

X BA / BAE 211 394 302 A3 .3 

(X) H X PA / MPA 46 005, 366 40 A3 .3 A3 .3 A3 .3 CE CE 

(X) H X PA / MPA 

X PA / MPA 46 005, 366 CL150 A3 .3 A3 .3 A3 .3 A3 .3 A3 .3 

47 (incl . Fl . 

CL400) 

006, 

367 

63 A3 .3 A3 .3 A3 .3 CE CE 

(X) H X PA / MPA 47 006, 367 CL300 A3 .3 A3 .3 A3 .3 CE CE 

X B+D – – NRG 

X B+D – – TRG 

X PA / MPA 110 002, 365 250 A3 .3 

1x-40/41 + 

NRS 1-40/41 

5-xx + TRS 

5-6/TRS5-7 

X B+D – – LRGT 16-1 + KS 90 



X B+D – – LRG 

1x-11 + 

NRS 1-7 

16-36 + 

NRS 1-9 

16-40 + LRR 

1-40 + URB 1 

351/352 + 

322 

265/267 + 

255 

377 + 

266 

351/357 

+ 323 

358 + 

323 

377 + 380 

+ 338 

40-160 CE 

CE CE 

40 CE 

40-160 CE 

40 CE 

40 CE 

X H X NRG 211 350 320 CE 

X H X LRG 17-1 377 63 CE 

X H X LRG 19-1 377 160 CE 

C – Heat Recovery Systems & Vessels 

CE on request 

(X) CE-marking depending on size 

(X)* on request 

Based on GESTRA standard types, e .g . BK 28 with non-std bw-connection 60 .3 x 2 .9 is not considered . 

replaces PA/MPA 26 




X A1, G (X) X Vessels X For more information see Price List 

*) liquids max. 10 bar 

*) = GAV 35, 35F PN 25 

*) = GAV 44F PN 16 

For special versions of GESTRA series equipment, 

e. g. other connection sizes, it is necessary to ascertain 

whether the equipment must be accompanied by 

the declaration of conformity and has to bear the CE 

marking. 

165 

D

Combined Imperial and S. I. Steam Tables 

VACUUM 

166 

Gauge 

Pressure 

bar g psi g 

14 .5 psi = 1 bar 

VACUUM 

These figures are in inches of Mercury 

Absolute 

Pressure 

bar a psi a 

Saturation 

Temperature 

t s 

°C °F 

Specific Enthalpy 

Water Evaporation Water Evaporation 

Sensible Latent Sensible Latent 

heat (h f) heat (hfg) heat (hf) heat (hfg) 

KJ/kg kJ/kg Btu/lb Btu/lb 

Specific 

Volume Steam 

V g 

m 3 /kg ft 3 /lb 

– 0 .96 

– 0 .91 

– 0 .86 

– 0 .81 

– 0 .76 

28 .4 

27 .0 

25 .5 

24 .0 

22 .5 

0 .05 

0 .1 

0 .15 

0 .2 

0 .25 

0 .725 

1 .45 

2 .18 

2 .90 

3 .63 

32 .9 

45 .8 

54 .0 

60 .1 

65 .0 

91 

114 

129 

140 

149 

138 

192 

226 

251 

272 

2423 

2392 

2373 

2358 

2346 

59 

82 

97 

108 

117 

1042 

1029 

1020 

1014 

1009 

28 .2 

14 .7 

10 .0 

7 .65 

6 .20 

452 

236 

160 

123 

99 .3 

– 0 .71 

– 0 .66 

– 0 .61 

– 0 .56 

– 0 .51 

21 .1 

19 .6 

18 .1 

16 .6 

15 .1 

0 .3 

0 .35 

0 .4 

0 .45 

0 .5 

4 .35 

5 .08 

5 .80 

6 .53 

7 .25 

69 .1 

72 .7 

75 .9 

78 .7 

81 .3 

156 

163 

169 

174 

178 

289 

304 

318 

330 

341 

2336 

2327 

2319 

2312 

2305 

124 

131 

137 

142 

147 

1004 

1000 

997 

994 

991 

5 .23 

4 .53 

3 .99 

3 .58 

3 .24 

83 .8 

72 .6 

63 .9 

57 .3 

51 .9 

– 0 .46 13 .7 0 .55 7 .98 83 .7 183 351 2299 151 988 2 .96 47 .4 

– 0 .41 12 .2 0 .6 8 .70 85 .9 187 360 2294 155 986 2 .73 43 .7 

– 0 .36 

– 0 .31 

– 0 .26 

10 .7 

9 .24 

7 .77 

0 .65 

0 .7 

0 .75 

9 .43 

10 .2 

10 .9 

88 .0 

90 .0 

91 .8 

190 

194 

197 

369 

377 

384 

2288 

2283 

2279 

159 

162 

165 

984 

982 

980 

2 .54 

2 .37 

2 .22 

40 .7 

38 .0 

35 .6 

– 0 .21 

– 0 .16 

6 .29 

4 .81 

0 .8 

0 .85 

11 .6 

12 .3 

93 .5 

95 .1 

200 

203 

392 

399 

2274 

2270 

169 

172 

978 

976 

2 .09 

1 .97 

33 .5 

31 .6 

– 0 .11 3 .34 0 .9 13 .1 96 .7 206 405 2266 174 974 1 .87 30 .1 

– 0 .06 1 .86 0 .95 13 .8 98 .2 209 411 2262 177 972 1 .78 28 .5 

– 0 .01 0 .38 1 .0 14 .5 99 .6 211 418 2258 179 971 1 .69 27 .1 

0 0 1 .013 14 .696 100 212 419 2257 180 970 1 .67 26 .8 

0 .1 1 .45 1 .11 16 .1 103 217 430 2250 185 967 1 .53 24 .5 

0 .2 2 .90 1 .21 17 .5 105 221 441 2243 190 964 1 .41 22 .6 

0 .3 4 .35 1 .31 19 .0 107 225 450 2237 194 962 1 .31 21 .0 

0 .4 5 .80 1 .41 20 .5 110 230 460 2231 198 959 1 .23 19 .7 

0 .5 7 .25 1 .51 21 .9 112 234 468 2226 201 957 1 .15 18 .4 

0 .6 8 .70 1 .61 23 .4 114 237 476 2220 205 954 1 .08 17 .3 

0 .7 10 .2 1 .71 24 .8 115 239 484 2215 208 952 1 .02 16 .3 

0 .8 11 .6 1 .81 26 .3 117 243 492 2211 212 951 0 .971 15 .6 

0 .9 13 .1 1 .91 27 .7 119 246 499 2206 215 948 0 .923 14 .8 

1 .0 14 .5 2 .01 29 .2 120 248 506 2201 218 946 0 .881 14 .1 

1 .1 16 .0 2 .11 30 .6 122 252 512 2197 220 945 0 .841 13 .5 

1 .2 17 .4 2 .21 32 .1 123 253 519 2193 223 943 0 .806 12 .9 

1 .3 18 .9 2 .31 33 .5 125 257 525 2189 226 941 0 .773 12 .4 

1 .4 20 .3 2 .41 35 .0 126 259 531 2185 228 939 0 .743 11 .9 

1 .5 21 .8 2 .51 36 .4 128 262 536 2181 230 938 0 .714 11 .4 

1 .6 23 .2 2 .61 37 .9 129 264 542 2177 233 936 0 .689 11 .0 

1 .7 24 .7 2 .71 39 .3 130 266 547 2174 235 935 0 .665 10 .7 

1 .8 26 .1 2 .81 40 .8 131 268 552 2170 237 933 0 .643 10 .3 

1 .9 27 .6 2 .91 42 .2 133 271 557 2167 240 932 0 .622 9 .96 

2 .0 29 .0 3 .01 43 .7 134 273 562 2163 242 930 0 .603 9 .66 

2 .2 31 .9 3 .21 46 .6 136 277 572 2157 246 927 0 .568 9 .10 

2 .4 34 .8 3 .41 49 .5 138 280 581 2151 250 925 0 .536 8 .59 

2 .6 37 .7 3 .61 52 .4 140 284 589 2145 253 922 0 .509 8 .15 

2 .8 40 .6 3 .81 55 .3 142 288 597 2139 257 920 0 .483 7 .74 

3 .0 43 .5 4 .01 58 .2 144 289 605 2133 260 917 0 .461 7 .38 

3 .2 46 .4 4 .21 61 .1 146 293 613 2128 264 915 0 .440 7 .05 

3 .4 49 .3 4 .41 64 .0 147 297 620 2123 267 913 0 .422 6 .76 

3 .6 52 .2 4 .61 66 .9 149 298 627 2118 270 911 0 .405 6 .49 

3 .8 55 .1 4 .81 69 .8 150 302 634 2113 273 908 0 .389 6 .23 

4 .0 58 .0 5 .01 72 .7 152 304 641 2108 276 906 0 .374 5 .99 

4 .2 60 .9 5 .21 75 .6 153 307 647 2104 278 905 0 .361 5 .78 

4 .4 63 .8 5 .41 78 .5 155 309 653 2099 281 902 0 .348 5 .57 

4 .6 66 .7 5 .61 81 .4 156 313 659 2095 283 901 0 .336 5 .38 

4 .8 69 .6 5 .81 84 .3 158 315 665 2090 286 899 0 .325 5 .21 

5 .0 72 .5 6 .01 87 .2 159 316 671 2086 289 897 0 .315 5 .01 

5 .5 79 .8 6 .51 94 .4 162 324 685 2076 295 893 0 .292 4 .68 

6 .0 87 .0 7 .01 102 165 329 698 2066 300 888 0 .272 4 .36 

6 .5 94 .3 7 .51 109 168 333 710 2057 305 884 0 .255 4 .09 

7 .0 102 8 .01 116 171 338 721 2048 310 880 0 .240 3 .84 

7 .5 109 8 .51 123 173 343 733 2039 315 877 0 .227 3 .64 

8 .0 116 9 .01 131 175 347 743 2031 319 873 0 .215 3 .44 

8 .5 123 9 .51 138 178 351 753 2023 324 870 0 .204 3 .27 

9 .0 131 10 .0 145 180 354 763 2015 328 866 0 .194 3 .11 

9 .5 138 10 .5 152 182 360 773 2008 332 863 0 .185 2 .96 

10 .0 145 11 .0 160 184 363 782 2000 336 860 0 .177 2 .84 

10 .5 152 11 .5 167 186 367 790 1993 340 857 0 .171 2 .74 

11 .0 160 12 .0 174 188 370 798 1986 344 854 0 .163 2 .61 

11 .5 167 12 .5 181 190 374 807 1979 347 851 0 .157 2 .51 

12 .0 174 13 .0 189 192 376 815 1973 350 848 0 .151 2 .42 

12 .5 181 13 .5 196 193 379 823 1966 354 845 0 .146 2 .34 

13 .0 189 14 .0 203 195 383 830 1960 357 843 0 .141 2 .26 

13 .5 196 14 .5 210 197 385 838 1953 360 840 0 .136 2 .18 

14 .0 203 15 .0 218 198 388 845 1947 363 837 0 .132 2 .11 

14 .5 210 15 .5 225 200 392 852 1941 366 834 0 .128 2 .05 

15 .0 218 16 .0 232 202 394 859 1935 369 832 0 .124 1 .99 

15 .5 225 16 .5 239 203 397 866 1929 372 829 0 .120 1 .92 

16 .0 232 17 .0 247 204 399 872 1923 375 827 0 .117 1 .87 

16 .5 239 17 .5 254 205 401 879 1918 378 824 0 .114 1 .83 

17 .0 247 18 .0 261 207 405 885 1912 381 822 0 .110 1 .76 

17 .5 254 18 .5 268 209 408 891 1907 383 820 0 .108 1 .73

Combined Imperial and S. I. Steam Tables 

Gauge 

Pressure 

bar g psi g 

14 .5 psi = 1 bar 

Absolute 

Pressure 

bar a psi a 

Saturation 

Temperature 

t s 

°C °F 

Specific Enthalpy 

Water Evaporation Water Evaporation 

Sensible Latent Sensible Latent 

heat (h f) heat (hfg) heat (hf) heat (hfg) 

KJ/kg kJ/kg Btu/lb Btu/lb 

Specific 

Volume Steam 

V g 

m 3/kg ft 3/lb 

18 .0 261 19 .0 276 210 410 897 1901 386 817 0 .105 1 .68 

18 .5 268 19 .5 283 211 412 903 1896 388 815 0 .103 1 .65 

19 .0 276 20 .0 290 213 415 909 1890 391 813 0 .100 1 .60 

19 .5 283 20 .5 297 214 417 915 1885 393 810 0 .0972 1 .56 

20 .0 290 21 .0 305 215 419 920 1880 396 808 0 .0949 1 .52 

21 .0 305 22 .0 319 217 423 931 1870 400 804 0 .0906 1 .45 

22 .0 319 23 .0 334 220 428 942 1860 405 800 0 .0868 1 .39 

23 .0 334 24 .0 348 222 432 952 1850 409 795 0 .0832 1 .33 

24 .0 348 25 .0 363 224 435 962 1841 414 792 0 .0797 1 .28 

25 .0 363 26 .0 377 226 439 972 1831 418 787 0 .0768 1 .23 

26 .0 377 27 .0 392 228 442 982 1822 422 783 0 .0740 1 .19 

27 .0 392 28 .0 406 230 446 991 1813 426 779 0 .0714 1 .14 

28 .0 406 29 .0 421 232 450 1000 1804 430 776 0 .0689 1 .10 

29 .0 421 30 .0 435 234 453 1009 1796 434 772 0 .0666 1 .07 

30 .0 435 31 .0 450 236 457 1017 1787 437 768 0 .0645 1 .03 

31 .0 450 32 .0 464 238 460 1026 1779 441 765 0 .0625 1 .00 

32 .0 464 33 .0 479 239 462 1034 1770 445 761 0 .0605 0 .97 

33 .0 479 34 .0 493 241 466 1042 1762 448 758 0 .0587 0 .94 

34 .0 493 35 .0 508 243 469 1050 1754 451 754 0 .0571 0 .915 

35 .0 508 36 .0 522 244 471 1058 1746 455 751 0 .0554 0 .887 

36 .0 522 37 .0 537 246 475 1066 1737 458 747 0 .0539 0 .863 

37 .0 537 38 .0 551 247 477 1073 1730 461 744 0 .0524 0 .839 

38 .0 551 39 .0 566 249 480 1080 1722 464 740 0 .0510 0 .817 

39 .0 566 40 .0 580 250 482 1087 1714 467 737 0 .0498 0 .798 

40 .0 580 41 .0 595 252 486 1095 1706 471 733 0 .0485 0 .777 

41 .0 595 42 .0 609 253 487 1102 1699 474 730 0 .0473 0 .758 

42 .0 609 43 .0 624 255 491 1108 1691 476 727 0 .0461 0 .738 

43 .0 624 44 .0 638 256 493 1115 1684 479 724 0 .0451 0 .722 

44 .0 638 45 .0 653 258 496 1122 1676 482 721 0 .0441 0 .706 

45 .0 653 46 .0 667 259 498 1129 1669 485 718 0 .0431 0 .690 

46 .0 667 47 .0 682 260 500 1135 1662 488 715 0 .0421 0 .674 

47 .0 682 48 .0 696 261 502 1142 1654 491 711 0 .0412 0 .660 

48 .0 696 49 .0 711 263 505 1148 1647 494 708 0 .0403 0 .646 

49 .0 711 50 .0 725 264 507 1155 1640 497 705 0 .0395 0 .633 

50 .0 725 51 .0 740 265 509 1161 1633 499 702 0 .0386 0 .618 

52 .0 754 53 .0 769 268 514 1173 1619 504 696 0 .0371 0 .594 

54 .0 783 55 .0 798 270 518 1185 1605 509 690 0 .0356 0 .570 

56 .0 812 57 .0 827 272 522 1197 1591 515 684 0 .0343 0 .549 

58 .0 841 59 .0 856 274 525 1208 1577 519 678 0 .0330 0 .529 

60 .0 870 61 .0 885 277 531 1219 1564 524 672 0 .0319 0 .511 

62 .0 899 63 .0 914 279 534 1230 1551 529 667 0 .0308 0 .493 

64 .0 928 65 .0 943 281 538 1241 1538 534 661 0 .0297 0 .476 

66 .0 957 67 .0 972 283 541 1251 1525 538 656 0 .0288 0 .461 

68 .0 986 69 .0 1001 285 545 1262 1512 543 650 0 .0278 0 .445 

70 .0 1015 71 .0 1030 287 549 1272 1499 547 644 0 .0270 0 .432 

72 .0 1044 73 .0 1059 289 552 1283 1486 552 639 0 .0261 0 .418 

74 .0 1073 75 .0 1088 291 556 1293 1473 556 633 0 .0253 0 .405 

76 .0 1102 77 .0 1117 292 559 1303 1460 560 628 0 .0246 0 .394 

78 .0 1131 79 .0 1146 294 561 1312 1447 564 622 0 .0239 0 .383 

80 .0 1160 81 .0 1175 296 565 1322 1435 568 617 0 .0232 0 .372 

82 .0 1189 83 .0 1204 298 568 1331 1422 572 611 0 .0226 0 .362 

84 .0 1218 85 .0 1233 299 570 1341 1410 576 606 0 .0219 0 .351 

86 .0 1247 87 .0 1262 301 574 1350 1398 580 601 0 .0213 0 .341 

88 .0 1276 89 .0 1291 302 576 1359 1385 584 595 0 .0208 0 .333 

90 .0 1305 91 .0 1320 304 579 1368 1368 588 590 0 .0202 0 .324 

92 .0 1334 93 .0 1349 305 581 1377 1360 592 585 0 .0197 0 .316 

94 .0 1363 95 .0 1378 307 585 1386 1348 596 580 0 .0192 0 .308 

96 .0 1392 97 .0 1407 309 588 1395 1336 600 574 0 .0187 0 .300 

98 .0 1421 99 .0 1436 310 590 1404 1323 604 569 0 .0183 0 .293 

100 .0 1450 101 .0 1465 312 594 1412 1311 607 564 0 .0178 0 .285 

105 .0 1523 106 .0 1537 315 599 1433 1280 616 550 0 .0168 0 .269 

110 .0 1595 111 .0 1610 319 606 1454 1249 625 537 0 .0158 0 .253 

115 .0 1668 116 .0 1683 322 612 1475 1218 634 524 0 .0149 0 .239 

120 .0 1741 121 .0 1755 325 617 1495 1188 643 511 0 .0141 0 .226 

125 .0 1813 126 .0 1828 328 622 1515 1157 651 497 0 .0133 0 .213 

130 .0 1886 131 .0 1900 331 628 1535 1125 660 484 0 .0126 0 .202 

135 .0 1958 136 .0 1973 334 633 1555 1093 668 470 0 .0120 0 .192 

140 .0 2031 141 .0 2045 337 639 1575 1060 677 456 0 .0114 0 .183 

145 .0 2103 146 .0 2118 340 644 1595 1027 686 442 0 .0108 0 .173 

150 .0 2176 151 .0 2190 343 649 1614 994 694 427 0 .0102 0 .163 

155 .0 2248 156 .0 2263 345 653 1634 960 702 413 0 .00972 0 .156 

160 .0 2321 161 .0 2335 348 658 1654 925 711 398 0 .00922 0 .148 

165 .0 2393 166 .0 2408 350 662 1674 888 720 382 0 .00875 0 .140 

170 .0 2466 171 .0 2480 353 667 1694 850 728 365 0 .00829 0 .133 

175 .0 2538 176 .0 2553 355 671 1715 811 737 349 0 .00785 0 .126 

180 .0 2611 181 .0 2625 357 675 1736 769 746 331 0 .00743 0 .119 

185 .0 2683 186 .0 2698 360 680 1759 726 756 312 0 .00701 0 .112 

190 .0 2756 191 .0 2770 362 684 1782 679 766 292 0 .00660 0 .106 

195 .0 2828 196 .0 2843 364 687 1806 628 776 270 0 .00619 0 .0992 

200 .0 2901 201 .0 2915 366 691 1833 562 788 242 0 .00577 0 .0924 

167 

D

DIN Material Reference Chart 

168 

EN Material Designation Old Material Designation (DIN) ASTM 

Number Symbol Number Symbol equivalent 1 ) Material 

EN-JL 1040 EN-GJL-250 0 .6025 GG-25 A126-B Grey cast iron 

EN-JS 1030 EN-GJS-400-15 0 .7040 GGG-40 A536 60-40-18 S . G . (ductile) iron 

EN-JS 1025 EN-GJS-400-18-LT 0 .7043 GGG-40 .3 – S . G . (ductile) iron 

EN-JS 1049 EN-GJS-400-18-U-LT 0 .7043 GGG-40 .3 – S . G . (ductile) iron to AD 2000 A4/W3/2 DIN EN 1563 

EN-JM 1030 EN-GJMW-400-5 0 .8040 GTW-40 – Whiteheart malleable cast iron 

1 .0038 235JRG2 1 .0038 RSt 37-2 A284-B Constructional steel 

1 .0315 P235G2TH 1 .0315 ST 37 .8 – Constructional steel 

1 .0460 P250GH 1 .0460 C22 .8 A105 Forged steel, unalloyed (carbon steel) 

1 .0619 GP240GH 1 .0619 GS-C 25 A216-WCB Cast steel (carbon steel) 

1 .4006 X12Cr13 1 .4006 X 10 Cr 13 A182-F6A Chromium steel 

1 .4008 GX7CrNiMo12-1 1 .4008 G-X 8 CrNi 13 – Cast stainless steel 

1 .4107 GX8CrNi12 1 .4107 G-X 8 CrNi 12 A217-CA15 Chromium steel 

1 .4301 X5CrNi18-10 1 .4301 X 5 CrNi 18 10 A182-F304 Forged stainless steel, austenitic 

1 .4308 GX5CrNi19-10 1 .4308 G-X 6CrNi 18 9 A351-CF8 Cast stainless steel, austenitic 

1 .4317 GX4CrNi13-4 – – A743 CA6NM Cast stainless steel 

– X2CrNiMo17-12-2 1 .4404 X2CrNiMo17132 A182 F316L Forged stainless steel, austenitic 

1 .4408 GX5CrNiMo19-11-2 1 .4408 G-X 6CrNiMo 18 10 A351-CF8M Cast stainless steel, austenitic 

1 .4486 x7 CrNiMo BNb 16-16 1 .4986 X8 CrNiMo BNb 16 16 – Forged steel, heat resistant 

1 .4541 X6CrNiTi18-10 1 .4541 X 6 CrNiTi 18 10 – Forged stainless steel, austenitic 

1 .4550 X6CrNiNb18-10 1 .4550 X 6 CrNiNb 18 10 A182-F347 Forged stainless steel, austenitic 

1 .4552 GX5CrNiNb19-11 1 .4552 G-X 5 CrNiNb 18 9 A351-CF8C Cast stainless steel, austenitic 

1 .4571 X6CrNiMoTi17-12-2 1 .4571 X 6 CrNiMoTi 17 12 2 AISI 316Ti Forged stainless steel, austenitic 

1 .4581 GX5CrNiMoNb19-11-2 1 .4581 G-X 5 CrNiMoNb 18 10 – Cast stainless steel, austenitic 

1 .4903 X10CrMoVNb9-1 1 .4903 X 10 CrMoVNb 91 A182-F91 Forged steel, heat resistant 

1 .4922 x20 CrMo V11-1 1 .4922 x20 CrMo V12 1 – Forged steel, heat resistant 

1 .5415 16Mo3 1 .5415 15 Mo 3 A182-F1 Forged steel, heat resistant 

1 .5419 G20Mo5 1 .5419 GS-22 Mo 4 A217-WC1 Cast steel, heat resistant 

1 .7335 13CrMo4-5 1 .7335 13 CrMo 4 4 A182-F12-2 Forged steel, heat resistant 

1 .7357 G17CrMo5-5 1 .7357 GS-17 CrMo 5 5 A217-WC6 Cast steel, heat resistant 

1 .7380 10CrMo9-10 1 .7380 10 CrMo 9 10 A182 F22-3 Forged steel, heat resistant 

1 .7383 10CrMo9-10 – – A182 F22-3 Forged steel, heat resistant 

2 .4600 Hastelloy B-3 2 .4600 NiMo 29Cr B335/564 Hastelloy B 

2 .4610 NiMo 16Cr 16Ti 2 .4610 NiMo 16Cr 16Ti B574 Hastelloy C 

2 .4632 Nimonic 90 2 .4632 NiCr20 Co18Ti – Nimonic 90 

2 .4669 Inconel X750 2 .4669 NiCr15 Fe7 TiAL B637, NACE MR-01-75 Inconel X750 

3 .7035 Ti 2 3 .7035 – B348/381 Titan 

CW608N CuZn 38 Pb 2 2 .0371 CuZN 38 Pb 1 .5 (MS60) – Hot-pressed brass 

CW614N CuZn 39 Pb 3 2 .0401 CuZn 39 Pb 3 – Brass 

CW617N Cu Zn 40 Pb 2 2 .0402 CuZn 40 Pb 2 – Brass 

CW710R CuZn 35 Ni3Mn2Al Pb 2 .0540 CuZn 35 Ni 2 – Special brass 

CW718R CuZn 39 Mn1Al Pb Si 2 .0561 CuZn 40 Al 1 – Special brass 

CC332G CuAl10Ni3Fe2-C 2 .0970 .01 G-CuAl 9 Ni – Bronze 

CC480K-GS CuSn10-Cu 2 .1050 .01 G-CuSn 10 – Bronze 

CC483K-GS CuSn12-C 2 .1052 .04 GC-CuSn 12 – Bronze 

1 ) Physical and chemical properties comply with DIN grade. ASTM nearest equivalent grade is stated for guidance only.

Design of GESTRA Valves 

GESTRA equipment with flanges or as wafer design for sandwiching 

between flanges DIN/EN now available in accordance with EN 1092-1 

Raised 

face 

Designation 

Raised Faces at a glance – Comparison Flange Standard DIN with EN 1092-1 

old (DIN) new (EN 1092-1) 

Admissible 

tolerance 

for roughness 

Raised 

face 

Designation 

Admissible 

tolerance 

for roughness 

Remark 

C Standard up to PN 40 N11/N10 ./ . Form C (old) is replaced by form B1 (new) 

D N9/N8 B1 Standard up to PN 40 N10/N8 Like form D but with def . groove 

E Standard up to PN 63 N8/N7 B2 Standard up to PN 63 N8/N6 Different tolerance for roughness 

F Tongue N9/N8 C Tongue N8/N6 Tongue heights do not match! 

N Groove N9/N8 D Groove N8/N6 Groove depths do not match! 

V Male face N11/N10 E Male face N10/N8 Heights of male faces do not match! 

R Female face N11/N10 F Female face N10/N8 Heights of female faces do not match! 

V14 Male face with turned groove N11/N10 H O-ring groove N8/N6 Dimensions identical 

R14 Female face to V14 N11/N10 G O-ring for male face N8/N6 Dimensions identical 

L Turned groove with convex seal N6 ./ . 

M 

Bevel with welded 

diaphragm seal 

N8/N7 ./ . 

Since some flange faces are not interchangeable with the associated DIN versions please state the standard and the form of the face. 

Example: BK 45 DN 20 PN 40 flanged to DIN 2635 form D [standard flat face, roughness Ra = 3 .2 – 6 .3 µm (N8/N9)] 

or: RK 16A DN 65 PN 40 for flange to EN 1092-1 form D (groove/groove face) 

Roughness 

class (old) 

Roughness Characteristics 

Symbol Ra Rz Rt CLA µ" Group (old) 

Unit µm µm µm µin – 

N1 0 .025 0 .22 - 0 .30 0 .24 - 0 .40 1 

N2 0 .05 0 .45 - 0 .60 0 .49 - 0 .80 2 

N3 0 .1 0 .8 - 1 .1 0 .85 - 1 .45 4 

N4 0 .2 1 .0 - 1 .8 1 .10 - 2 .40 8 

N5 0 .4 1 .6 - 2 .8 1 .75 - 3 .60 16 

N6 0 .8 3 .0 - 4 .8 3 .2 - 6 .0 32 

N7 1 .6 5 .9 - 8 .0 6 .3 - 10 63 

N8 3 .2 12 .0 - 16 .0 13 .0 - 19 .5 125 

N9 6 .3 23 - 32 25 - 38 250 

N10 12 .5 46 - 57 48 - 68 500 

N11 25 90 - 110 95 - 130 1000 

N12 50 160 - 220 190 - 250 2000 

169 

D

Technical Literature 

Technical 

Documentation 

Data sheets, installation instructions and 

brochures . 

GESTRA 

Condensate Manual 

Selection guide for steam traps . 

Examples of installation, sizing of steam and 

condensate lines etc . 

GESTRA Technical 

References 

Technical reference for engineers and 

operating personnel . 

170 

GESTRA 

Valve Library 

2D component parts for Auto CAD 14 and Auto 

CAD 2000 available on CD and to download 

from: www .gestra .de 

3D component parts in IPT, IGES, SAT and 

STEP format available to downlowad from: 

www .gestra .de 

GESTRA 

Boiler Automation 

Animated presentation of various operating 

modes of steam boilers, their safety, 

reliability and cost efficiency . 

Brochure 

“Equipment for Energy Supply Centres” 

Leaflet 

“Modern Equipment for Steam and 

Hot-Water-Plants” 

Leaflet 

“Conductivity Monitoring for Steam and 

Condensate Systems” 

Leaflet 

“Self-Monitoring Temperature Limiter” 

Presentation of GESTRA's SPECTOR 

product range .

Product Index 

171 

D

Index by Product Name 

Product Type Product-Range Page 

Air vents BK, MK A1 6 – 8 

ATEX Directive – – 159 

Ball float trap UNA A1 10 – 14 

Bar chart indicator URA B 94 

Blowdown receiver VDM C 141 

Blowdown valve, continuous (with electric actuator) BAE B 118 – 119 

Blowdown valve, continuous (without actuator) BA B 118 – 119 

Blowdown valve, intermittent (with pneumatic actuator) MPA B 122 – 123 

Blowdown valve, intermittent (without actuator) PA B 122 – 123 

Buoyancy transmitter LD B 94 – 95 

Capsule trap MK A1 8 – 9 

Check valve, dual-plate BB A2 42 – 45 

Combined imperial and S .I . steam tables D 164 – 165 

Condensate collector V 21 .9/K A1 26 

Condensate dampening pot ED C 142 

Condensate drain valve AK A1 17 – 19 

Condensate recovery and return systems SDR A, SDL C 132 – 134 

Conductivity control unit LRR B 109 – 115 

Conductivity controller / limiter KS 90 B 109 – 111 

Conductivity electrode LRG B 109 – 115 

Conductivity switch LRS B 119, 114 – 115 

Conductivity transmitter LRT B 119, 114 – 115 

Connector for electrode LRG – B 117 

Contamination detector OR B 124 – 125 

Continuous blowdown valve, with electric actuator BAE B 118 – 119 

Continuous blowdown valve, without actuator BA B 118 – 119 

Control unit, conductivity LRR B 109 – 115 

Control valve V 725, ZK A4 63 – 67 

Controller, level NRR B 88 – 89, 94 – 95 

Conversions D 157 – 158 

Cooling water control valve, GESTRAMAT CW A4 54 – 55 

Deaerator dome NDR C 139 

Desuperheater, water bath KD C 137 

Detector, oil ORGS B 126 – 127 

Detector, oil & turbidity OR B 124 – 125 

DISCO non-return valve RK A2 30 – 41 

DISCO swing check valve CB A2 46 – 47 

DISCOCHECK dual-plate check valve BB A2 42 – 45 

Drain valve AK A1 17 – 19 

Dual-plate check valve BB A2 42 – 45 

Electrode, conductivity LRG B 109 – 115 

Feedwater tank SW C 139 

Flash vessel systems VD C 140 

Float trap UNA A1 10 – 14 

Flow computer Flow 20, Flow 100 B 128 

Flowmeter Flow 20/100, 83 W/FA B 128 

172



GESTRAMAT, Cooling water control valve CW A4 54 – 55 

Gravity circulation check SBO A2 29 

High-capacity ball float traps UNA Special A1 13 – 14 

High-capacity steam trap TK 23/24 A1 18 – 20 

High-level alarm NRS B 88 – 89, 94 – 95 

High-pressure control valve ZK A4 64 – 67 

Indicator, bar-chart URA B 94 

Indicator, digital URB B 88 – 89 

Injection cooler EK C 137 

Intermittent blowdown valve, with pneumatic actuator MPA B 122 – 123 

Intermittent blowdown valve, without actuator PA B 122 – 123 

Kalorimat BW A4 56 – 57 

Level control NRG B 92 – 93 

Level controller NRR B 88 – 89, 94 – 95 

Level electrode NRG B 86 – 101 

Level electrode / probe NRG, ER B 86 – 101 

Level limiter NRS B 88 – 89, 94 – 95 

Level monitoring, Bus Compact NRG, NRGS, NRGT B 86 – 91 

Level pot for electrodes MF B 96 – 97, 117 

Level switch NRS B 88 – 89, 94 – 95 

Level transmitter NRT B 94 – 95 

Limiter, temperature TRS 5-6/7, TRS 5-8 B 106 – 107 

Low-level alarm NRS B 88 – 89, 94 – 95 

Low-pressure trap MK 20 A1 18 

Materials guide – D 166 

Measuring pot for level electrodes MF B 96 – 97, 117 

Mixing cooler VDM C 141 

Monitoring equipment for steam traps VK, VKE, VKP-Ex, VKP 40 A1 24 – 25 

Monitoring unit SRL B 96 – 97 

NAF check valve NAF-Check A2 50 – 51 

Non-return valve RK A2 30 – 41 

Non-return valve, screwed MB A2 30 – 31 

Oil & turbidity detector OR B 124 – 125 

Oil detector ORGS B 126 – 127 

PED – D 160 – 163 

PLC Controls – C 144 – 145 

Power supply unit URN B 98 – 99 

Pressure Equipment Directive – D 160 – 163 

Pressure maintaining valve 5610 A4 59 

Pressure reducing valve 5801 A4 58 

Programme-controlled blowdown system TA B 120 – 121 

Pump controls NRSP B 90 – 91, 144 – 145 

Resistance thermometer TRG B 106 – 107 

Return temperature control valve BW A4 56 – 57 

Rhombusline steam traps – A1 6 – 9, 15 – 18 

Roughness caracteristics – – 167 

173 

D



Safety valve GSV A6 68 

Screwed non-return valve MB A2 30 – 31 

Self-acting pressure controller, pressure-maintaining valve 5610 A4 59 

Self-acting pressure controller, pressure-reducing valve 5801 A4 58 

Self-acting temperature controller – A4 60 – 62 

Service case VRM B 116 – 117 

Sightglass VK A1 24 

Stainless steel, Material guide – D 166 

Steam drier/purifier TD, TP C 143 

Steam manifold V 21 .9 A1 26 

Steam regenerator GRDE C 138 

Steam separator TP, TD C 143 

Steam tables – D 164 – 165 

Steam trap for air line drainage UNA A1 22 

Steam trap for large condensate flowrates GK 11/21, TK 23/24 A1 17 – 20 

Steam trap for SIP applications SMK A1 17 – 19 

Steam trap for UNIVERSAL connectors BK 35A/7, MK 35A/7, DK 36A/7 A1 21 

Steam trap monitoring equipment VK, VKE, VKP-Ex, VKP 40 A1 24 – 25 

Steam trap testing unit NRA A1 24 – 25 

Steam trap with adjustable discharge temperature UBK A1 17 – 19 

Steam trap with Duo s .s . (bimetallic) regulator BK A1 6 – 7 

Steam trap with membrane regulator MK A1 8 – 9 

Steam/air drier & purifier TP, TD C 143 

Steam-powered condensate return units KH, FPS C 135 – 136 

Steriline SMK A1 17 – 19 

Stop valve GAV A8 71 

Strainer GSF, SZ A7 69 – 70 

Swing check valve CB A2 46 – 47 

Swing check valve WB A2 48 – 49 

Switch, conductivity LRS B 119, 114 – 115 

Switch, level NRS B 88 – 89, 94 – 95 

Switch, TDS LRS B 119, 114 – 115 

Switch, temperature TRS 5-6/7 B 106 – 107 

Tank for feedwater SW C 139 

TDS transmitter LRT B 119, 114 – 115 

Technical literature – D 168 

Temperature control valve BW A4 56 – 57 

Temperature controller, self-acting – A4 60 – 62 

Temperature limiter TRS 5-6/7, TRS 5-8 B 106 – 107 

Temperature pre-amplifier TRV B 104 – 105 

Temperature sensor TRG B 106 – 107 

Temperature switch TRS 5-6/7 B 106 – 107 

Testing unit for steam traps NRA A1 24 – 25 

Thermodynamic steam trap DK A1 15 – 16 

Thermostatic steam trap BK, MK, SMK, TK A1 6 – 9, 17 – 20 

Thermostatic/Thermodynamic steam trap BK A1 6 – 7 

Training seminars – D 156 

Transmitter, buoyancy LD B 94 – 95 

Transmitter, conductivity LRT B 119, 114 – 115 

174



Transmitter, level NRT B 94 – 95 

Trap testing equipment VK, VKE, VKP-Ex, VKP 40 A1 24 – 25 

Trap testing unit NRA A1 24 – 25 

Traptest VKP 40 A1 25 

Twin plate check valve BB A2 42 – 45 

Universal controller KS 92 B 94 – 95 

Useful information – D 157 – 158 

Vapophone VKP 10 A1 25 

Vaposcope VK A1 24 

Vortex flow meter 83 W/FA B 128 

Wafer-type non-return valve RK A2 30 – 41 

Water-bath desuperheater KD C 137 

175 

D

Index by Product Code 

Type Product Product-Range Page 

AK Condensate drain valve A1 17 – 19 

BA Continuous blowdown valve, without actuator B 118 – 119 

BAE Continuous blowdown valve, with electric actuator B 118 – 119 

BB Dual-plate check valve A2 42 – 45 

BK Steam trap with Duo s .s . (bimetallic) regulator A1 6 – 7 

BK Air vents A1 6 – 7 

BW Return temperature control valve, Kalorimat A4 56 – 57 

CB Swing check valve A2 46 – 47 

Clorius Self-acting temperature controllers A4 60 – 62 

CW Cooling water control valve, GESTRAMAT A4 54 – 55 

DK Steam trap for large-scale installations A1 15 – 16 

ED Condensate dampening pot C 142 

EK Injection cooler C 137 

ER Level electrode, multiple tips B 

Flow 20, Flow 100 Flow computer, flowmeter B 128 

FPS Steam-powered condensate return units C 135 – 136 

GAV Stop valve A8 71 

GK 11/21 Steam trap for large condensate flowrates A1 17 – 20 

GRDE Steam regenerator C 138 

GSF Strainer A7 69 

GSV Safety valve A6 68 

KD Desuperheater, water bath C 137 

KH Steam-powered condensate return units C 135 

KS 90 Conductivity controller / limiter B 109 – 111 

KS 92 Universal controller B 94 – 95 

LD Buoyancy transmitter B 94 – 95 

LRG Conductivity electrode B 109 – 115 

LRR Conductivity control unit B 109 – 115 

LRS Conductivity switch B 109, 114 – 115 

LRT Conductivity transmitter B 109, 114 – 115 

MB Screwed non-return valve A2 30 – 31 

MF Level pot for electrodes B 96 – 97, 117 

MK 20 Low-pressure trap A1 18 

MK Air vents A1 8 – 9 

MK Steam trap with membrane regulator A1 8 – 9 

MPA Intermittent blowdown valve, with pneumatic actuator B 122 – 123 

NAF-Check Check valve A2 50 – 51 

NRA Trap testing unit A1 24 – 25 

NRG Level control B 92 – 93 

NRG, NRGS, NRGT Level monitoring, Bus Compact B 86 – 101 

NRR Level controller B 88 – 89, 94 – 95 

NRS Level switch B 88 – 89, 94 – 95 

NRSP Pump control B 90 – 91, 144 – 145 

NRT Level transmitter B 94 – 95 

OR Oil & turbidity detector B 124 – 125 

ORGS Oil detector B 126 – 127 

176

Index by Product Code 

Type Product Product-Range Page 

PA Intermittent blowdown valve, without actuator B 122 – 123 

RK Non-return valve A2 30 – 41 

SBO Gravity circulation check A2 29 

SDL Condensate recovery and return systems, vertical C 133 – 134 

SDS Condensate recovery and return systems, horizontal C 133 – 134 

SDR A Condensate recovery and return systems C 132 

SMK Steam trap for SIP applications, Steriline A1 17 – 19 

SRL Monitoring unit B 96 – 97 

SW Feedwater tank C 139 

Swivel Steam trap for UNIVERSAL connectors A1 21 

SZ Strainer A7 70 

TA Programme-controlled blowdown system B 120 – 121 

TD Steam separator, steam drier/purifier C 143 

TK 23/24 High-capacity steam trap A1 18 – 20 

TP Steam driers/purifiers C 143 

TRG Temperature sensor, resistance thermometer B 106 – 107 

TRS 5-6/7 Temperature switch, temperature limiter B 106 – 107 

TRS 5-8 Temperature monitor B 106 – 107 

UBK Steam trap with adjustable discharge temperature A1 17 – 19 

UNA Ball float trap A1 10 – 14 

UNA Steam trap for air line drainage A1 22 

URA Bar chart indicator B 94 

URB Indicator, digital B 88 – 89 

URN Inverter, power supply unit B 98 – 99 

V 21 .9 Steam manifold A1 26 

V 21 .9/K Condensate collector A1 26 

V 725 Control valve A4 63 

VD Flash vessel systems C 140 

VDM Mixing cooler, blowdown receiver C 141 

VK Vaposcope, sightglass A1 24 

VKE Test set, steam trap monitoring A1 24 – 25 

VKP 10 Steam trap monitoring system A1 25 

VKP 40 Traptest, steam trap monitoring A1 25 

VKP 40 Ex Traptest, steam trap monitoring A1 25 

VRM Service case B 116 – 117 

WB Swing check valve A2 48 – 49 

ZK High-pressure control valve, control valve A4 64 – 67 

5610 Pressure-maintaining valve A4 59 

5801 Pressure-reducing valve A4 58 

83 W/FA Vortex flowmeter B 128 

177 

D

Note: Responable care has been taken in preparing this illustrated catalogue. GESTRA reserves the right to make 

corrections and changes. Illustrations in our printed literature are liable to alteration and are not intended to be binding. 

We also reserve the unrestricted property and copyright in all estimates, drawings or related documents, which must 

not be made available to third parties. 

Revised 2009 

GESTRA AG 

Münchener Str. 77, D-28215 Bremen 

P. O. Box 10 54 60, D-28054 Bremen 

Telephone +49 (0) 421-35 03-0 

Telefax +49 (0) 421-35 03-393 

E-Mail gestra.ag@flowserve.com 

Internet www.gestra.de 

810564-07/1108 EMA · © 2007 · GESTRA AG · Bremen · Printed in Germany With Energy into the Future

Gestra Products Technical - Control And Power

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