Design, Butt Weld Ends

HIGH PERFORMANCE 

LINE VALVES 

FOR POWER 

GENERATION 

Publication DEW 10/99

2 

DEWRANCE – A PIONEERING 

HISTORY IN STEAM 

The DEWRANCE name owes its origin to John Dewrance, 

a pioneer of steam locomotive development. 

He was responsible for the construction of George 

Stephenson’s locomotive “The Rocket”, assisting at the 

Rainhill trials in 1820. The success of “The Rocket” 

during these trials resulted in its use on the Liverpool & 

Manchester Railway. 

The founders pioneer efforts in connection with the 

railways naturally influenced his engineering activities 

and a business was established in South London in 1844. 

John Dewrance & Co., was soon to become known as an 

innovative manufacturer of products for steam 

application. 

Sir John Dewrance took over control of his father’s 

business in 1879. Under his guidance, the pioneering 

work of his father continued. In 1882 he 

married Isabella Trevithick, 

granddaughter of Richard 

Trevithick, one of the leading 

early railway pioneers. 

He became a director and 

Chairman of Babcock & Wilcox Ltd in 

1899 a position he held until one year before his death 

in 1937. At this time, the company became a wholly 

owned subsidiary of Babcock & Wilcox eventually 

moving to Skelmersdale in 1965. 

Today, Dewrance is a part of Tyco International Limited 

and operates in the Engineered Products Group of the 

company’s Flow Control Division. 

Founded 1844 

John Dewrance, founder of John Dewrance & Co. 

Dewrance is ideally positioned to fully meet the many 

and varied requirements of its customers. 

Dewrance is best known, and enjoys a worldwide 

reputation, for its range of Parallel Slide Gate Valves. 

In addition, the company offers an unrivalled range of 

other high performance valves for power generation 

and associated industries. 

George Stephenson’s ‘Rocket’. A section of the valve engineering department at the Skelmersdale facility.

DEWRANCE 

CONTROLLING PRESSURE WORLDWIDE 

The Dewrance business was acquired by Tyco 

International Ltd in 1998 from Dresser Industries. 

From the Skelmersdale headquarters, Dewrance provides 

valve engineering, sales, contracts and administration to 

support a comprehensive range of line valves including 

parallel slide valves, check valves and special application 

products. 

To keep abreast of customer requirements, Dewrance is 

committed to continual research and product 

development. The company is renowned for technical 

excellence and it’s ability to provide flow solutions to 

match your application requirements. 

A 30” Class 300 DEWRANCE Parallel Slide 

Valve being installed in a UK Power Station. 

A section of the extensive valve 

component store at Skelmersdale. 

Dewrance understand what productivity means to you 

the customer, and are fully aware of the dangers and 

costs associated with a shutdown. This is why the 

company provides a comprehensive valve repair, parts 

and service capability from the Tyco International valve 

service facility in Germany, complemented by the 

Skelmersdale operation where stocks of valve spares are 

available on a fast turnaround. 

Being part of the world’s largest valve company, with 

some of the leading international names in valve, 

actuator and controls manufacture, positions Dewrance 

to offer complete valve and control packages from a 

single source. 

CONTENTS Page 

Valve Manufacturing 4 

Quality Standards and NDE 6 

Line Valve Product Range 8 

High Pressure Cast Steel 

Parallel Slide Gate Valves 11 

High Pressure Forged Steel 


Low Pressure Cast Steel 


High Pressure Steel Check Valves 51 

Low Pressure Steel Swing Check Valves 61 

Bled Steam Check Valves 69 

Feed Water Heater Isolation System 81 

Reheater Isolating Device 91 

Product Numbering Guide 99 

Materials of Construction 100 

Recommended Spare Parts Holding 101 

3

4 

MANUFACTURING TO 

INTERNATIONAL STANDARDS 

Dewrance products are manufactured at one of Tyco 

Internationals’ specialist valve manufacturing plants in 

Europe. 

The facilities work closely with engineers at 

Skelmersdale to provide a total in-house capability for 

manufacture, testing and service of Dewrance products, 

the plants have full ISO 9001 accreditation and are 

regularly audited by major worldwide customers. 

Valves are manufactured to international standards to 

fully meet the requirements of the contract 

specification. 

High pressure parallel slide valves in final assembly. 

A broad range of materials are employed, all of which 

are stored with their individual certification in a fully 

controlled environment. 

All valves are manufactured using top quality castings 

produced by companies who specialise in high integrity 

pressure retaining castings. 

The plant has the most up to date valve testing facilities 

including hydraulic, water and steam test rigs, with full 

ASME Certification. 

Despatch area where valves are prepared and packed for shipment to all 

parts of the world. 

All valves are hydraulically tested up to pressures of 1164 barg.

State of the art machine tools play a major role in the quality and success of Dewrance products. 

Magnetic particle inspection of valve body. 

Radiographic and/or ultrasonic examination to ensure high integrity castings are provided. 

DEWRANCE 

QUALITY POLICY 

It is the policy of Dewrance 

to provide its customers with 

services and products which 

are safe, reliable, efficient and 

which fully satisfy our 

customers requirements and 

expectations. 

Dewrance is committed to 

the communication and 

implementation of the policy 

by providing training, 

equipment, education and 

direction at all levels of the 

organisation. Dewrance will 

promote continuous 

improvement to the quality 

system, product and customer 

service by reviewing and 

evaluating the effectiveness 

of the policy on an 

ongoing basis. 

5

6 

LLOYD’S REGISTER QUALITY ASSURANCE

QUALITY STANDARD 

AND NDE 

Dewrance has rationalised the various international NDE 

standards and developed its own standard quality plans 

for each different level of inspection. 

Applicable Dewrance Quality Levels 

Valve Type Body Nominal Size 

Acceptance Standards 

Ultrasonic Examination: 

To ASME B16.34. Annex E. 

Magnetic Particle: 

To ASME B16.34 Annex C. 

Visual Inspection MSS SP 55: 

Radiography Radiographic 

examination is available as 

an optional extra, details 

available on request. 

Valve Rating (Class) 

150 – 600 900 1500 

2500 

& above 

ASME B16.34 Forged 15mm – 100mm S9 S9 S9 S9 

Standard Class Cast 125mm & above S9 S7 S7 S7 

ASME B16.34 Forged 15mm – 100mm S8 S8 S8 S8 

Special Class Cast 125mm & above S8 S8 S8 S8 

Standard Levels of NDE Coverage 

Standard Magnetic 

Visual 

Quality 

Particle 

Inspc. 

Plan 

Inspection 

Ultrasonic Equivalent 

Inspection Standard 

S7 100% 

B.W. Ends 

Change Sect. 

B.W. Ends – 

ASME B16.34 

Standard Class 900+ 

S8 100% 100% B.W. Ends 

Pressure Seal 

area & change 

of section* 

ASME B16.34 

Special Class 

ESI 56/1 Lev. 6 

S9 100% – – – 

ASME B16.34 

Std. Class Forged 

up to 600 Class Cast 

*As defined in Section 8 of ASME B16.34 

Typical Coverage Areas (other than 100%) 

7

8 

Parallel Slide 

Gate Valves 

SIZES 5”-24” (125-600mm) 

in Carbon & Alloy Cast Steel. 

Ratings ASME 1000-2850 

Class or 160-500 Bar. 

Butt weld connections only. 

SIZES: 21 ⁄2”-20” (65-500mm) 

in Carbon & Alloy Cast steel. 

Ratings ASME 150-600 Class 

or 25-100 Bar. 

Flanged or Butt weld 

connections. 

SIZES: 2”-4” (50-100mm) 

in Carbon & Alloy Forged 

steel. 


Class or 160-500 Bar. 


Tilting Disc Check 

Valves 

SIZES: 21 ⁄2”-24” (65-600mm) in 

Forged/Cast. 

Carbon steel & Cast Alloy 

steel. 


Class or 160-500 Bar 


Note: 21 ⁄2”-5” are swing 

check. 

LINE VALVE PRODUCT RANGE 

Swing Check 

SIZES: 21 ⁄2”-20” (65-500mm) 

in Carbon & Alloy Cast steel. 

Ratings ASME 150-600 Class 

or 25-100 Bar. 

Flanged orButt weld 

connections. 

Lift Check 

SIZES: 4”-16” (100-400mm) 

in Cast Carbon steel. 

Ratings 100-400 Bar. 


Feed Water Heater 

Isolation Systems 

These valves are designed to 

bypass high pressure feed 

water around a group of 

heaters in the event of high 

water level in the shell 

caused by a defective tube, 

weld or drain system.They 

can be adjusted to operate 

between 3-20 seconds. 

As an alternative, a spring 

load bypass valve can be 

supplied. This is the simplest 

form of bypass which 

relieves at a set pressure and 

is fail safe.The Dewrance 

design has the advantage of 

a pressure seal bonnet and 

external spring adjustment 

whilst the valve is still under 

pressure. 

Leak off Equipment 

These valves are designed to 

protect boiler feed pumps 

from over-heating at low 

rates of flow. At a 

predetermined minimum 

flow, the re-circulating valve 

opens automatically and recloses 

at a predetermined 

greater flow. 

Bled Steam Check 

Valves 

These valves are designed for 

installation in bled 

(extraction) steam lines 

between steam turbines and 

feed water heaters, but are 

equally applicable to 

reheater connections and 

bleed on pass-out lines in 

process plants. 

Where power assistance is 

required, an Air to Open and 

Spring or Spring & Air to 

Close Pneumatic cylinder can 

easily be accommodated, 

whilst still maintaining the 

Automatic Gravity closing 

feature. 

The valves are available in 

sizes 150mm to 1000mm 

for varying pressure and 

temperature applications. 

Y-Pattern Globe Stop 

Valve 

Designed to meet 

applications where the user 

requires a combined stop 

and check valve for Main 

Steam Isolation providing 

tight shut off with minimum 

pressure loss through the 

valve. Size range 6”-18” 

ASME Class 1000-2850 INT 

RATINGS, with WCB, WC6 

and WC9 body materials. 

Butt Weld Ends as standard. 

Parallel Slide 

Gate Valves 

SIZES: 1 ⁄2” – 2” (15-50mm) 

in Carbon & Alloy steel. 


Class or 500 Bar. 

End connections Socket or 

Butt weld. 

Tandem Vent & 

Drain Valve 

SIZES: 3 ⁄4”-2” (20-50mm) 


Class. 



Globe Stop Valves 

SIZES: 1 ⁄2”-2” (15-50mm) 


Class. 



Reheater Isolation 

Device 

Provides a time saving 

method of isolation for 

hydrostatic testing, wet or 

dry lay-up and chemical 

cleaning. 

Available in Sizes 16”-36” 

(400-900mm) in Cast Carbon 

and Alloy steel. 

Ratings ASME 500 Class 

(Cold Reheat) and 900 Class 

(Hot Reheat). 

Pressure Seal 

Closures 

Pressure Seal Closures 

provide ease of access to 

pressure vessels and pipelines 

for inspection purposes and 

can be fitted to existing 

installations. 

Available in size up to 24” 

(600mm) in Forged Carbon 

and Alloy steels. 

Ratings ASME 600-2850 Class. 

9

10 

A TOTAL VALVE CAPABILITY – 

FROM A SINGLE SOURCE 

As part of Tyco Engineered Products Group, Dewrance is able to offer a comprehensive range of 

power industry valves. These include some of the industry’s leading brands and include: 

Sempell / Intervalve 

Forged gate, globe and check valves 

Large bore globe, stop and check valves 

Low pressure wedge gate valves 

Safety valves 

Control valves 

Anderson Greenwood, Crosby / Sapag 

Safety and safety relief valves. 

This catalogue updates and incorporates the previous Dewrance 

catalogues Reference Numbers: 

DE-1, Parallel Slide Gate Valves 2–20” Class 1000–2850. 

DE-2, Reheater Isolating Device. 

DE-3, Parallel Slide Gate Valves 2–20” Class 300–600. 

DE4, High Pressure Steel Check Valves 21 ⁄2–24” Class1000–2850. 

DE-5, Swing Check Valves 2–20” Class 150–600. 

Yarway 

Hancock 

Steam traps 

Desuperheaters 

Pump recirculation valves 

Water level indicators 

Small gate, globe and check valves 

DE-6, Forged Steel Parallel Slide Gate Valves 1–2” Class 1690–3525. 

DE-7, Forged Steel Parallel Slide Gate Valves 1–4” Class 4500. 

DE-8, Parallel Slide Gate Valves 2 1 ⁄2–24” Class 150. 

FWHIS/96, Feed Water Heater Isolation System. 

BSNR/96, Bled Steam Check Valves. 

DFS/A/H/89, Forged Steel Globe, Screw down Non-Return & Check Valves 

1 ⁄2–2” Class 1690–3525.

High pressure 

Cast Steel 

Parallel Slide Gate Valves 

Sizes 5” – 24” 

ASME B16.34 – 1996 

Valve overall lengths to 

ASME B16.10 – 1992 

Pressure Class: 1000, 1690, 1715, 

2260, 2500, 2850 

11

12 



Sizes 5” – 24” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 

Pressure Class: 

1000, 1690, 1715, 2260, 2500, 2850 

Features & Benefits 

Excellent Reliability 

● Eyelet Follower providing a smooth flow path & 

maximum performance 

● Self cleaning action between disk & seat 

● Welded-in seats hard-faced with Stellite ® or 

Equivalent 

● Seat surface protection provides extended life 

Low Cost Maintenance 

● Expanded graphite pressure seal & gland packing 

● Lower operating forces than wedge gate design 

● Interchangability of parts 

● Simplified seat refurbishment (only requires flat 

lapping, no critical angles to be matched to ensure 

sealing capability) 

● Longer seat life with eyelet follower, due to reduced 

erosion 

Improved Performance 

● Lower pressure drop characteristic than wedge 

gate valve 

● Minimised flow turbulence 

● Reduced actuator size/cost by 30% when compared to 

wedge gate 

● Higher allowable seat velocity 

● Improved sealing assisted by line pressure 

● Low operating torque, seals on position not torque 

Typical Applications 

● Main Steam Isolation 

● Boiler Feed Pump Isolation 

● H.P. Feed Heater Isolation & By-Pass 

● Blow Down Service 

● Blow Off Service 

● Gland Steam System Drains 

● Steam Turbine Inlet Isolation 

● Economizer Recirculation 

● Spray Water 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

Anti-friction bearings are fitted for direct 

handwheel operation. 

Four pillar design for rigidity and accessibility. 

Stem stop clearly indicates valve position & 

prevents stem rotation. 

Jacking screws to pre-load pressure seal. 

Pressure seal closure improves as pressure 

increases. 

Springs or spring to hold disc against seat face 

for initial sealing. 

Hard faced Stellite ® / or equiv. discs and seats. 

Combined eyelet/conduit and belt-eye/disc 

holder. 

Two piece gland. 

Specially designed stuffing box to suit 

expanded graphite packing. 

Neck bushing for stem support. 

Expanded graphite pressure seal ring. 

Hard faced Stellite ® / or equiv. back seat. 

Disc retainer. 

Butt weld ends. 



1 

2 

3 

4 

5 

6 

7 

8 

Drain can be fitted as required 

Please note valves up to and including 4” size are Forged, Carbon or Alloy Steel and are not fitted with an eyelet/conduit. 

9 

10 

11 

12 

13 

14 

15 

13

14 

Operation of Parallel Slide Gate Valves 

Valve Operation 

When a Parallel Slide is opened or closed, the 

positioning of two flat spring loaded discs will either 

seal or open the pipeline passage. 

Closure is achieved by positioning the discs between the 

seat faces in the valve body. The pressure differential 

across the disc forces the outlet disc against the outlet 

seat, creating a tight seal which is far superior to that of 

a wedge gate valve. 

The two separate spring loaded discs mounted in the 

belteye/disc holder have sufficient loading and freedom 

of movement to allow accurate contact between the flat 

lapped faces over the range of expansion and 

contraction regardless of the valve orientation. 

During valve closure the self wiping action of the discs 

ensures that debris is not trapped between the sealing 

faces. 

Stem travel is limited by the back seat in open position 

and the stem stop in the closed position. The stem stop 

prevents stem rotation and acts as a position indicator. 

Unlike a wedge gate valve it is line pressure and 

POSITION, not excessive mechanical force at the end of 

stroke that is required to make a seal. 

When the position indicator is in the closed position the 

valve is fully isolated. 

DO NOT APPLY ANY ADDITIONAL FORCE. 

Because the discs are free to slide between the seat 

faces it is virtually impossible to create an overstressed 

condition under normal operation. 

Valves 5” size and greater have an eyelet/conduit as part 

of the belteye/disc holder. The advantages of this eyelet 

are. 

1. It produces a smoother flow between the seat faces 

by effectively eliminating the body cavity and the 

turbulence which it causes. 

2. It protects the seat faces from impingement of the 

line fluid or anything suspended in it. 

3. It prevents debris in the fluid being thrown out of 

suspension into the valve body. 

When the eyelet/conduit is positioned between the 

seats, the bottom of the disc faces are still in contact 

with seat faces. No body guides are required. 

By-pass and Equalizing Devices 

By-Pass valves are used to reduce the traversing differential 

pressure across the valve seat. This reduces the size of the 

operating gear, resulting in considerable savings. By-Passes 

also provide a convenient means for the initial warming 

through of pipe lines. 

Equalizing devices are used to relieve the fluid trapped 

between the seat faces, and to provide an outlet for the 

fluid displaced by the valve stem traversing to the shut 

position. This situation is quite common in valves used on 

non compressible fluids such as feed systems etc., but it 

can also arise on steam valves due to the collection of 

condensate inside the valve body during shut down, and 

fluctuating ambient temperature conditions. 

When a by-pass is used, it provides a means of fitting an 

equalizing connection from the main valve, through the 

by-pass and to the main line. This is a most convenient 

arrangement, as it does not make the main valve 

unidirectional. 

When a by-pass is not required and external small bore 

pipe loop, connecting the inside of the valve body to one 

of the branches, can be used as an equalizing device. 

Alternatively a hole drilled through one of the seats can 

serve the same purpose. These devices are quite 

satisfactory but require correct orientation. To prevent 

water discharge during trip conditions the valve should be 

equalized towards the source of pressure. 

For bi-directional flow conditions only equalizing by-pass 

valves are recommended for water and a plain by-pass for 

steam. 

PLAIN BY-PASS 

EQUALIZING PIPE EQUALIZING BY-PASS

Advantages of Venturi Parallel Slide Valves 

Closure 

takes 

place 

at outlet 

only 

PARALLEL SLIDE GATE VALVE 

Flow 

Venturi provides uninterrupted flow path 

and protected seat faces 

Flow 

Flow path 

interrupted by 

turbulence due 

to absence of 

eyelet, resulting 

in higher ∆p 

DISADVANTAGES OF WEDGE GATE VALVE 

VENTURI 

PARALLEL SLIDE VALVE 

Seat faces 

exposed to 

system dirt 

and scale 

Traversing distance much greater 

than equivalent Parallel Slide Valve 

‘FULL‘ BORE 

WEDGE GATE VALVE 

Venturi Follower-Eye Feature 

The advantages of the “follower-eye” are clearly shown 

in the sketch opposite, page which compares the Venturi 

Parallel Slide design with a full bore Wedge Gate Valve. 

● Parallel Slide Gate Valves use system pressure and 

position to provide positive isolation. 

● Seal is established on outlet seat face only. 

● Springs are fitted between disks to provide initial 

searing force only, and do not maintain the sealing 

force. 

● No additional torque required to achieve a positive 

seal once discs are in position. 

● Wedge gates require additional force to make the 

seal between the tapered seat surfaces. 

● Wedge Gate Valves require larger operating forces. 

● Parallel Slide Valves can cope with movements due to 

expansion/contraction without the need for 

additional manual intervention. 

● Wiping action of discs over seats during closing, 

removes debris therefore helps prevent premature 

wear. 

● Follower-Eye on Venturi design Parallel Slide Valve 

provides: 

• Smooth flow path between seats. 

• Protects seat faces from direct impingement of 

system debris. 

• Enables a physically smaller & lighter valve to meet 

pressure drop equivalent of L/D=13. 

● Non-wiping action of wedge gate traps debris 

between wedge and seat faces, thus preventing 

sealing and promoting leakage and localised erosion. 

● Benefits of Follower-Eye are impossible to apply to 

Wedge Gate design resulting in: 

• Turbulent flow path between seat faces. 

• Seat faces exposed to system debris and erosion 

• Physically larger seat bore and valve required to 

meet equivalent Dewrance venturi P.S.V. pressure 

drop figure. 

● Full bore wedge Gate valves seat dimension is usually 

based on 90% of end bore to achieve acceptable 

pressure drop characteristic. 

● 90% seat bore to end bore ratio is NOT a requirement 

of ASME B16.34 as per interpretation 1-36. 

15

16 

Pressure/Temperature Ratings (Parallel Slide Valves) 

Imperial 150 Class (ASME B16.34 1996) 

ASTM Body Material 

Prod. Page 

No. No. 

Cast 

P21 

A216 44 

P22 

E 

WCB 45 


Prod. Page 

No. No. 

Cast 

P21 

A216 44 

P22 

E 

WCB 45 


Prod. Page 

No. No. 

Cast 

P31 

P32 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

46 

47 


Prod. Page 

No. No. 

Cast 

P31 

P32 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

46 

47 


Prod. Page 

No. No. 

Cast 

P51 

E 

J 

A216 

WCB 

A217 

WC6 

A217 

WC9 

48 

ASME Code 

B16.34 

Metric 150 Class (ASME B16.34 1996) 

P52 

L 

49 

Pressure in lbf/sq. in. at Temp. ˚F (for intermediate ratings use linear interpolation) 

-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 285 260 230 200 170 140 125 110 95 80 65 – – – – – – – 

Spec. 290 290 290 290 290 275 270 265 240 200 130 – – – – – – – 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

Pressure in Bar at Temp. ˚C (for intermediate ratings use linear interpolation) 

-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 19.6 19.3 17.7 15.8 14.0 12.1 10.2 8.4 7.4 6.5 5.6 4.6 – – – – – – 

Spec. 20.0 20.0 20.0 20.0 20.0 20.0 19.3 18.5 18.0 16.4 14.0 9.7 – – – – – – 

ASME Code 

B16.34 


P51 

P52 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

48 

49 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 740 675 655 635 600 550 535 535 505 410 270 – – – – – – – 

Spec. 750 750 750 750 750 715 700 695 630 515 335 – – – – – – – 

Std. 750 750 720 695 665 605 590 570 530 510 485 450 320 268 215 180 145 120 

Spec. 750 750 750 750 750 750 750 735 730 720 680 585 400 335 270 225 180 150 

Std. 750 750 730 705 665 605 590 570 530 510 485 450 375 318 260 218 175 143 

Spec. 750 750 740 725 720 720 715 710 690 675 645 600 470 398 325 273 220 178 

ASME Code 

B16.34 



-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 51.0 50.0 46.4 45.1 43.9 41.8 38.9 36.9 36.6 34.6 28.7 20.2 – – – – – – 

Spec. 51.7 51.7 51.7 51.7 51.7 51.7 50.0 48.2 47.3 43.1 36.0 25.1 – – – – – – 

Std. 51.7 51.7 51.5 49.6 48.1 46.2 42.9 40.3 38.9 36.5 35.2 33.7 31.7 25.3 18.2 12.7 8.8 6.0 

Spec. 51.7 51.7 51.7 51.7 51.7 51.7 51.7 51.5 50.6 50.3 49.7 47.3 42.0 32.2 22.7 15.9 11.0 7.5 

Std. 51.7 51.7 51.5 50.3 48.7 46.3 42.9 40.3 38.9 36.5 35.2 33.7 31.7 27.7 21.6 15.3 10.5 6.9 

Spec. 51.7 51.7 51.6 51.0 50.1 49.7 49.6 49.2 48.8 47.5 46.6 44.8 42.2 35.6 27.0 19.2 13.2 8.5 

ASME Code 

B16.34 



-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 1480 1350 1315 1270 1200 1095 1075 1065 1010 825 535 – – – – – – – 

Spec. 1500 1500 1500 1500 1500 1425 1400 1390 1260 1030 670 – – – – – – – 

Std. 1500 1500 1445 1385 1330 1210 1175 1135 1065 1015 975 900 640 535 430 360 290 240 

Spec. 1500 1500 1500 1500 1500 1500 1500 1465 1460 1440 1355 1175 795 668 540 450 360 300 

Std. 1500 1500 1455 1410 1330 1210 1175 1135 1065 1015 975 900 755 638 520 435 350 285 

Spec. 1500 1500 1485 1450 1440 1440 1430 1425 1380 1345 1285 1200 945 798 650 543 435 355 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 102.0 100.0 92.8 90.6 87.8 83.6 77.5 74.0 72.9 69.1 57.6 40.1 – – – – – – 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 99.7 96.4 94.6 86.2 72.0 50.2 – – – – – – 

Std. 103.4 103.4 103.0 99.5 95.8 92.4 85.7 80.4 77.6 73.3 70.2 67.7 63.4 50.6 36.3 25.4 17.7 12.0 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 103.4 102.8 101.0 100.6 99.4 94.4 84.2 64.2 45.3 31.8 22.0 15.1 

Std. 103.4 103.4 103.0 100.3 97.5 92.7 85.7 80.4 77.6 73.3 70.2 67.7 63.4 55.7 43.3 30.7 21.1 13.8 

Spec. 103.4 103.4 103.3 102.3 100.2 99.4 99.3 98.5 97.8 95.1 92.9 89.3 84.3 71.5 54.2 38.3 26.2 17.2 

Note ‘a’ – Permissible but not recommended for prolonged usage above 800˚F (425˚C).


Imperial 1000 int. Class (ASME B16.34 1996) 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

P67 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

A217 

P67 J 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

20 

21 


Prod. Page 

No. No. 

Forged Cast 

A216 

D A105 E 

WCB 

A217 

P73 J 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

P73 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Cast 

E 

P8A J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

20 

21 

24 

25 


Prod. Page 

No. No. 

Cast 

ASME Code 

B16.34 

Metric 1000 int. Class (ASME B16.34 1996) 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 170.1 166.8 154.6 150.8 146.0 139.0 129.0 123.2 121.6 114.9 95.9 66.9 – – – – – – 

Spec. 172.4 172.4 172.4 172.4 172.4 172.4 166.3 160.5 157.3 143.7 119.9 83.6 – – – – – – 

Std. 172.4 172.4 171.6 165.7 159.9 154.0 142.9 134.1 129.4 122.0 117.1 112.7 105.6 84.1 60.5 42.4 29.3 20.3 

Spec. 172.4 172.4 172.4 172.4 172.4 172.4 172.4 171.4 168.4 167.3 165.6 157.1 140.2 107.2 75.6 53.0 36.7 25.2 

Std. 172.4 172.4 171.8 167.3 162.5 154.5 142.9 134.1 129.4 122.0 117.1 112.7 105.6 92.6 72.1 51.2 35.1 23.0 

Spec. 172.4 172.4 172.1 170.3 166.9 165.7 165.5 164.2 162.8 158.4 155.0 148.9 140.5 119.0 90.2 64.0 43.8 28.6 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 4173 3803 3696 3571 3374 3082 3025 3002 2839 2320 1509 – – – – – – – 

Spec. 4225 4225 4225 4225 4225 4016 3938 3909 3549 2896 1882 – – – – – – – 

Std. 4225 4225 4067 3904 3746 3408 3313 3199 2996 2861 2744 2530 1796 1507 1217 1014 811 676 

Spec. 4225 4225 4225 4225 4225 4225 4225 4130 4106 4056 3814 3307 2247 1884 1521 1268 1014 845 

Std. 4225 4225 4102 3977 3746 3408 3313 3199 2996 2861 2744 2530 2124 1797 1469 1227 985 802 

Spec. 4225 4225 4175 4079 4056 4056 4033 4006 3887 3791 3622 3380 2654 2245 1836 1534 1233 1003 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 287.6 282.1 261.3 254.7 246.9 235.1 218.1 208.2 205.4 194.3 162.1 113.0 – – – – – – 

Spec. 291.3 291.3 291.3 291.3 291.3 291.3 280.9 271.0 266.0 242.9 202.4 140.9 – – – – – – 

Std. 291.3 291.3 290.0 280.2 270.1 260.2 241.5 226.6 218.6 206.2 197.8 190.5 178.3 142.1 102.3 71.6 49.6 34.1 

Spec. 291.3 291.3 291.3 291.3 291.3 291.3 291.3 289.7 284.5 282.9 279.9 265.7 237.1 181.2 127.9 89.5 62.0 42.6 

Std. 291.3 291.3 290.3 282.6 274.9 261.1 241.5 226.6 218.6 206.2 197.8 190.5 178.3 156.5 122.1 86.6 59.4 38.9 

Spec. 291.3 291.3 290.9 287.7 281.8 279.9 279.7 277.6 275.1 267.7 261.8 251.6 237.4 201.0 152.5 108.3 74.2 48.5 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 4235 3859 3751 3624 3424 3127 3070 3047 2881 2355 1531 – – – – – – – 

Spec. 4288 4288 4288 4288 4288 4076 3996 3967 3602 2939 1910 – – – – – – – 

Std. 4288 4288 4127 3962 3801 3458 3362 3246 3041 2903 2784 2568 1823 1529 1235 1029 823 686 

Spec. 4288 4288 4288 4288 4288 4288 4288 4191 4166 4116 3871 3356 2280 1912 1544 1286 1029 858 

Std. 4288 4288 4162 4035 3801 3458 3362 3246 3041 2903 2784 2568 2156 1823 1491 1245 1000 814 

Spec. 4288 4288 4237 4139 4116 4116 4093 4066 3945 3847 3675 3430 2694 2278 1863 1557 1251 1017 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 2468 2250 2188 2112 1995 1823 1789 1778 1678 1373 894 – – – – – – – 

Spec. 2500 2500 2500 2500 2500 2378 2333 2312 2100 1716 1116 – – – – – – – 

Std. 2500 2500 2406 2311 2217 2017 1961 1894 1773 1694 1623 1499 1062 892 722 600 478 400 

Spec. 2500 2500 2500 2500 2500 2500 2500 2444 2428 2400 2256 1956 1328 1114 900 750 600 500 

Std. 2500 2500 2428 2351 2217 2017 1961 1894 1773 1694 1623 1499 1256 1062 868 725 583 475 

Spec. 2500 2500 2472 2416 2400 2400 2384 2372 2300 2244 2144 2000 1572 1328 1084 906 728 592 


22 

23 

36 

38 


22 

23 

36 

38 




-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

P8A 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A21 

WC9 

24 

25 

Std. 291.9 286.3 265.2 258.4 250.5 238.6 221.3 211.3 208.5 197.2 164.5 114.7 – – – – 

Spec. 295.6 295.6 295.6 295.6 295.6 295.6 285.1 275.0 270.0 246.5 205.4 143.0 – – – – 

Std. 295.6 295.6 294.3 284.3 274.1 264.1 245.1 229.9 221.8 209.3 200.7 193.3 180.9 144.2 103.8 72.6 

Spec. 295.6 295.6 295.6 295.6 295.6 295.6 295.6 294.0 288.7 287.1 284.0 269.6 240.6 183.9 129.8 90.8 

Std. 295.6 295.6 294.6 286.8 278.9 265.0 245.1 229.9 221.8 209.3 200.7 193.3 180.9 158.9 123.9 87.9 

Spec. 295.6 295.6 295.2 292.0 285.9 284.1 283.8 281.7 279.1 271.7 265.6 255.3 240.9 204.0 154.8 109.9 

– 

– 

50.3 

62.9 

60.2 

75.3 

– 

– 

34.6 

43.2 

39.4 

49.2 

Note ‘a’ – Permissible but not recommended for prolonged usage above 800˚F (425˚C). 

17

18 




Prod. Page 

No. No. 

Cast 

E 

P83 J 

L 


Prod. Page 

No. No. 

Cast 

E 

P83 J 

L 


Prod. Page 

No. No. 

Cast 

E 

P91 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

28 

29 


Prod. Page 

No. No. 

Cast 

E 

P91 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

A216 

WCB 

A217 

WC6 

A217 

WC9 

A216 

WCB 

A217 

WC6 

A217 

WC9 

28 

29 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

P95 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Forged Cast 

A216 

D A105 E 

WCB 

P95 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

26 

27 

26 

27 

ASME Code 

B16.34 


ASME Code 

B16.34 


ASME Code 

B16.34 



-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 6170 5625 5470 5280 4990 4560 4475 4440 4200 3430 2230 – – – – – – – 

Spec. 6250 6250 6250 6250 6250 5940 5825 5780 5250 4285 2785 – – – – – – – 

Std. 6250 6250 6015 5775 5540 5040 4905 4730 4430 4230 4060 3745 2655 2228 1800 1500 1200 1000 

Spec. 6250 6250 6250 6250 6250 6250 6250 6110 6070 6000 5645 4895 3320 2785 2250 1875 1500 1250 

Std. 6250 6250 6070 5880 5540 5040 4905 4730 4430 4230 4060 3745 3145 2658 2170 1813 1455 1185 

Spec. 6250 6250 6180 6035 6000 6000 5965 5930 5750 5605 5355 5000 3930 3323 2715 2268 1820 1483 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 425.3 417.1 386.5 376.9 365.1 347.6 322.7 308.0 303.8 287.5 239.7 167.0 – – – – – – 

Spec. 430.9 430.9 430.9 430.9 430.9 430.9 415.5 400.9 393.4 359.3 299.4 208.6 – – – – – – 

Std. 430.9 430.9 429.0 414.4 399.5 384.9 357.1 335.3 323.2 304.9 292.5 281.8 263.9 210.1 151.2 105.9 73.4 50.4 

Spec. 430.9 430.9 430.9 430.9 430.9 430.9 430.9 428.6 420.9 418.3 414.0 393.1 350.9 268.0 189.1 132.4 91.7 63.1 

Std. 430.9 430.9 429.4 418.2 406.5 386.2 357.1 335.3 323.2 304.9 292.5 281.8 263.9 231.7 180.5 127.9 87.7 57.4 

Spec. 430.9 430.9 430.3 425.9 416.9 414.1 413.7 410.7 407.1 369.0 387.1 372.0 351.1 297.5 225.7 160.0 109.7 71.8 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 7035 6412 6236 6019 5688 5199 5102 5061 4788 3910 2542 – – – – – – – 

Spec. 7125 7125 7125 7125 7125 6771 6641 6589 5985 4885 3175 – – – – – – – 

Std. 7125 7125 6858 6584 6314 5745 5591 5392 5050 4822 4628 4269 3028 2540 2052 1710 1368 1140 

Spec. 7125 7125 7125 7125 7125 7125 7125 6965 6921 6840 6435 5579 3786 3175 2565 2138 1710 1425 

Std. 7125 7125 6920 6703 6314 5745 5591 5392 5050 4822 4628 4269 3586 3030 2475 2067 1660 1351 

Spec. 7125 7125 7045 6880 6840 6840 6800 6760 6555 6391 6106 5700 4480 3787 3095 2585 2076 1690 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 5578 5085 4944 4774 4511 4122 4045 4014 3797 3101 2016 – – – – – – – 

Spec. 5650 5650 5650 5650 5650 5370 5266 5226 4746 3873 2517 – – – – – – – 

Std. 5650 5650 5438 5221 5008 4556 4433 4276 4005 3824 3670 3385 2401 2014 1627 1356 1085 904 

Spec. 5650 5650 5650 5650 5650 5650 5650 5523 5488 5424 5103 4425 3002 2518 2034 1695 1356 1130 

Std. 5650 5650 5487 5316 5008 4556 4433 4276 4005 3824 3670 3385 2843 2403 1962 1639 1316 1072 

Spec. 5650 5650 5586 5455 5424 5424 5393 5360 5198 5067 4841 4520 3552 3003 2455 2050 1646 1340 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 384.5 377.1 349.4 340.7 330.1 314.3 291.7 278.4 274.7 259.9 216.7 151.0 – – – – – – 

Spec. 389.6 389.6 389.6 389.6 389.6 389.6 375.7 362.4 355.7 324.8 270.7 188.5 – – – – – – 

Std. 389.6 389.6 387.8 374.6 361.1 348.0 322.9 303.1 292.2 275.7 264.4 254.7 238.5 189.9 136.7 95.7 66.3 45.6 

Spec. 389.6 389.6 389.6 389.6 389.6 389.6 389.6 387.5 380.5 378.2 374.2 355.4 317.2 242.3 170.9 119.7 82.9 57.0 

Std. 389.6 389.6 388.2 378.1 367.5 349.1 322.9 303.1 292.2 275.7 264.4 254.7 238.5 209.5 163.2 115.7 79.3 51.9 

Spec. 389.6 389.6 389.0 385.0 376.9 374.4 374.0 371.3 368.0 358.0 349.9 336.3 317.4 268.9 204.0 144.7 99.2 64.9 


30 

31 

37 

39 


30 

31 

37 

39 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 484.8 475.6 440.6 429.6 416.2 396.3 367.9 351.1 346.3 327.7 273.2 190.3 – – – – – – 

Spec. 491.3 491.3 491.3 491.3 491.3 491.3 473.7 457.0 448.5 409.6 341.4 237.8 – – – – – – 

Std. 491.3 491.3 489.0 472.4 455.5 438.7 407.1 382.2 368.5 347.5 333.4 321.2 300.8 239.6 172.4 120.7 83.6 57.5 

Spec. 491.3 491.3 491.3 491.3 491.3 491.3 491.3 488.6 479.8 476.9 471.9 448.2 400.0 305.5 215.6 150.9 104.5 71.9 

Std. 491.3 491.3 489.6 476.8 463.4 440.2 407.1 382.2 368.5 347.5 333.4 321.2 300.8 264.2 205.9 145.9 100.0 65.4 

Spec. 491.3 491.3 490.6 485.5 475.3 472.1 471.6 468.2 464.1 451.5 441.3 424.1 400.3 339.1 257.3 182.5 125.0 81.8 





Prod. Page 

No. No. 

Forged Cast 

PX7 K 

A182 A217 

F22 

L 

WC9 

40 


Prod. Page 

No. No. 

Forged Cast 

PX7 K 

A182 A217 

F22 

L 

WC9 

40 

ASME Code 

B16.34 



-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 11250 11250 10925 10585 9965 9070 8825 8515 7970 7610 7305 6740 5665 4788 3910 3268 2625 2135 

Spec. 11250 11250 11120 10865 10800 10800 10735 10670 10350 10095 9645 9000 7070 5978 4885 4083 3280 2668 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 775.7 775.7 773.0 752.8 731.7 694.8 642.6 603.3 581.8 548.5 526.2 507.0 474.8 417.3 325.2 230.6 158.0 103.2 

Spec. 775.7 775.7 774.6 766.3 750.5 745.4 744.6 739.1 732.6 712.9 697.1 670.0 632.1 535.4 406.1 288.1 197.4 128.9 


Valves for Special Applications 

In any power installation there are always special 

product requirements, which invariably do not feature in 

standard product publications. Dewrance has many years 

experience in supplying customers needs through flexible 

and innovative design. 

Dewrance have many years experience in supplying 

valves in Modified 9% Chrome material to ASTM A217 

C12A. 

A comprehensive worldwide installation list can be 

provided on request. 

Main steam stop and 

check valve assembly with X20 cuff. 

Dewrance use a local foundry which specialises in this 

material for UK turbine makers. 

19

20 

Cast Steel Parallel Slide Gate Valves 

Sizes 5”– 24” 

ASME B16.34 1000 Class 

Main component materials 

Description Carbon Steel Alloy Steel Alloy Steel 

Body A216 Gr. WCB A217 Gr. WC6 A217 Gr. WC9 

Bonnet A105 A182 F11 A182 F22 

Cover A516 Gr. 60 A387 Gr. 11 A387 Gr. 11 

Stem AISI 431 A565-XM32 A565-XM32 

Gland Aluminium Bronze ASTM B150 630 

Seats A105 A182 F22 A182 F22 

Yoke Sleeve Aluminium Bronze ASTM B150 630 

Handwheel Cast Iron / Steel 

Disc A105 A182 F22 A182 F22 

Gland Packing Expanded Graphite 

Pressure 

Seal Ring 

Expanded Graphite 

Hydrostatic shell & seat leak test pressures 

Material 

Press. ASTM ASTM ASTM 

Class 

A-216 WCB A-217 WC6 A-217 WC9 

Shell Seat Shell Seat Shell Seat 

1000 psi 3750 2750 3750 2750 3750 2750 

Dimensions 

bar 259 190 259 190 259 190 

* Per ASME B16.10 1992 † 18”, 20” & 24” Nominal sizes not shown in ASME B16.10 Product Numbers 

‘P’ Design (Lower ∆P) Carbon Steel Alloy Steel Alloy Steel 

Size A* B C M N P Weight Cv K Factor WCB WC6 WC9 

5 in 17 7.75 31.1 4.72 5.71 44 214lb 

125 mm 432 196 789 120 145 1118 97kg 

6 in 20 9 36.38 5.63 6.81 51 352lb 

150 mm 508 228 924 143 173 1296 160kg 

8 in 26 11.56 44.21 7.44 8.78 63 629lb 

200 mm 660 293 1123 189 223 1601 286kg 

10 in 31 14.93 52.72 9.25 10.94 76 1265lb 

250 mm 787 379 1339 235 278 1931 575kg 

12 in 36 17.25 59.88 11.10 12.99 87 1900lb 

300 mm 914 437 1521 282 330 2210 864kg 

14 in 39 18.37 63.7 12.2 14.25 93 2213lb 

350 mm 991 466 1618 310 362 2363 1006kg 

16 in 43 20.75 68.98 13.98 16.26 101 2992lb 

400 mm 1092 526 1752 355 413 2566 1360kg 

18† in 48 23.12 78.35 15.59 18.31 115 4158lb 

450† mm 1219 586 1990 396 465 2921 1890kg 

20† in 52 25.43 88.39 17.32 20.31 129 5890lb 

500† mm 1321 646 2245 440 516 3277 2677kg 

24† in 61 30.31 101.77 20.79 24.37 150 9030lb 

600† mm 1549 770 2585 528 619 3810 4104kg 

Product No. P67 

‘P’ Design, Butt Weld Ends 

A 

1605 0.172 P67ES125P P67JS125P P67LS125P 

2240 0.179 P67ES150P P67JS150P P67LS150P 

3848 0.185 P67ES200P P67JS200P P67LS200P 

7355 0.121 P67ES250P P67JS250P P67LS250P 

9881 0.139 P67ES300P P67JS300P P67LS300P 

11126 0.160 P67ES350P P67JS350P P67LS350P 

14474 0.163 P67ES400P P67JS400P P67LS400P 

18282 0.158 P67ES450P P67JS450P P67LS450P 

22709 0.156 P67ES500P P67JS500P P67LS500P 

33258 0.151 P67ES600P P67JS600P P67LS600P 

M 

N 

C 

B 

Withdrawal Space 

P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1000 psi 3750 2750 3750 2750 3750 2750 

Dimensions 

bar 259 190 259 190 259 190 

* Per ASME B16.10 1992 † 18”, 20” & 24” Nominal sizes not shown in ASME B16.10 Product Numbers 

‘R’ Design (Higher ∆P) Carbon Steel Alloy Steel Alloy Steel 


5 in 17 6.65 24.72 4.72 5.71 36 145lb 

125 mm 432 169 628 120 145 915 66kg 

6 in 20 7.75 31.1 5.63 6.81 44 233lb 

150 mm 508 196 789 143 173 1118 106kg 

8 in 26 9 36.38 7.44 8.78 51 416lb 

200 mm 660 228 924 189 223 1296 189kg 

10 in 31 11.56 44.21 9.25 10.94 63 704lb 

250 mm 787 293 1123 235 278 1601 320kg 

12 in 36 14.94 52.72 11.10 12.99 76 1373lb 

300 mm 914 379 1339 282 330 1931 623kg 

14 in 39 17.25 59.88 12.2 14.25 87 1985lb 

350 mm 991 437 1521 310 362 2210 901kg 

16 in 43 18.36 63.7 13.98 16.26 93 2317lb 

400 mm 1092 466 1618 355 413 2363 1051kg 

18† in 48 20.75 68.98 15.59 18.31 101 3166lb 

450† mm 1219 526 1752 396 465 2566 1436kg 

20† in 52 23.12 78.35 17.32 20.31 115 4323lb 

500† mm 1321 586 1990 440 516 2921 1961kg 

24† in 61 25.44 88.39 20.79 24.37 129 6424lb 

600† mm 1549 646 2245 528 619 3277 2914kg 


‘R’ Design, Butt Weld Ends 

A 

956 0.485 P67ES125R P67JS125R P67LS125R 

1410 0.452 P67ES150R P67JS150R P67LS150R 

1802 0.844 P67ES200R P67JS200R P67LS200R 

3181 0.647 P67ES250R P67JS250R P67LS250R 

6394 0.332 P67ES300R P67JS300R P67LS300R 

9161 0.236 P67ES350R P67JS350R P67LS350R 

9808 0.355 P67ES400R P67JS400R P67LS400R 

12887 0.318 P67ES450R P67JS450R P67LS450R 

16376 0.300 P67ES500R P67JS500R P67LS500R 

18634 0.481 P67ES600R P67JS600R P67LS600R 

M 

N 

C 

B 


P 

21

22 


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1690 psi 6350 4650 6350 4650 6350 4650 

Dimensions 

bar 438 321 438 321 438 321 

* Per ASME B16.10 1992 † 24” Nominal sizes not shown in ASME B16.10 Product Numbers 



5 in 19 7.25 30.20 4.25 5.71 42 255lb 

125 mm 483 184 767 108 145 1066 116kg 

6 in 22 8.81 31.46 5.12 6.81 46 425lb 

150 mm 559 223 799 130 173 1168 193kg 

8 in 28 11.25 43.43 6.69 8.78 62 893lb 

200 mm 711 286 1103 170 223 1575 405kg 

10 in 34 13.68 50.71 8.35 10.94 74 1533lb 

250 mm 864 347 1288 212 278 1880 696kg 

12 in 39 16.25 58.15 10.04 12.99 84 2508lb 

300 mm 991 413 1477 255 330 2134 1138kg 

14 in 42 17.93 64.00 11.02 14.25 93 3166lb 

350 mm 1066 455 1626 280 362 2362 1436kg 

16 in 47 20.56 68.15 12.64 16.26 100 4380lb 

400 mm 1194 522 1731 321 413 2540 1987kg 

18 in 53 22.75 77.28 14.09 18.31 114 6039lb 

450 mm 1346 577 1963 358 465 2896 2740kg 

20 in 58 25.12 82.83 15.63 20.31 122 8263lb 

500 mm 1473 637 2104 397 516 3099 3748kg 

24† in 66 30 100.28 18.78 24.37 148 13362lb 

600† mm 1676 761 2547 477 619 3759 6061kg 



A 

1104 0.239 P73ES125P P73JS125P P73LS125P 

2371 0.194 P73ES150P P73JS150P P73LS150P 

3103 0.186 P73ES200P P73JS200P P73LS200P 

4873 0.183 P73ES250P P73JS250P P73LS250P 

7084 0.181 P73ES300P P73JS300P P73LS300P 

8755 0.172 P73ES350P P73JS350P P73LS350P 

11760 0.165 P73ES400P P73JS400P P73LS400P 

14748 0.162 P73ES450P P73JS450P P73LS450P 

18319 0.159 P73ES500P P73JS500P P73LS500P 

27048 0.152 P73ES600P P73JS600P P73LS600P 

M 

N 

C 

B 


P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Dimensions 

Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1690 psi 6350 4650 6350 4650 6350 4650 

bar 438 321 438 321 438 321 




5 in 19 5.94 23.87 4.25 5.71 34 216lb 

125 mm 483 150 606 108 145 864 98kg 

6 in 22 7.25 30.20 5.12 6.81 42 282lb 

150 mm 559 184 767 130 173 1066 128kg 

8 in 28 8.81 31.46 6.69 8.78 46 500lb 

200 mm 711 223 799 170 223 1168 227kg 

10 in 34 11.25 43.43 8.35 10.94 62 1023lb 

250 mm 864 286 1103 212 278 1575 464kg 

12 in 39 13.69 50.71 10.04 12.99 74 1679lb 

300 mm 991 347 1288 255 330 1880 762kg 

14 in 42 16.25 58.15 11.02 14.25 84 2625lb 

350 mm 1066 413 1477 280 362 2134 1191kg 

16 in 47 17.94 64 12.64 16.26 93 3364lb 

400 mm 1194 455 1626 321 413 2362 1526kg 

18 in 53 20.56 68.15 14.09 18.31 100 5880lb 

450 mm 1346 522 1731 358 465 2540 2667kg 

20 in 58 22.75 77.28 15.63 20.31 114 6340lb 

500 mm 1473 577 1963 397 516 2896 2876kg 

24† in 66 25.12 82.83 18.78 24.37 122 8980lb 

600† mm 1676 637 2104 477 619 3099 4074kg 



A 

573 0.886 P73ES125R P73JS125R P73LS125R 

1246 0.702 P73ES150R P73JS150R P73LS150R 

1427 0.880 P73ES200R P73JS200R P73LS200R 

2545 0.671 P73ES250R P73JS250R P73LS250R 

4064 0.550 P73ES300R P73JS300R P73LS300R 

6419 0.320 P73ES350R P73JS350R P73LS350R 

7572 0.398 P73ES400R P73JS400R P73LS400R 

10428 0.324 P73ES450R P73JS450R P73LS450R 

13056 0.313 P73ES500R P73JS500R P73LS500R 

14839 0.505 P73ES600R P73JS600R P73LS600R 

M 

N 

C 

B 


P 

23

24 


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1715 psi 6450 4725 6450 4725 6450 4725 

Dimensions 

bar 444 326 444 326 444 326 


‘T’ Design (Lower ∆P) Carbon Steel Alloy Steel Alloy Steel 


5 in 19 7.25 30.20 4.25 5.71 42 255lb 

125 mm 483 184 767 108 145 1066 116kg 

6 in 22 8.81 31.46 5.12 6.81 46 425lb 

150 mm 559 223 799 130 173 1168 193kg 

8 in 28 11.25 43.43 6.69 8.78 62 893lb 

200 mm 711 286 1103 170 223 1575 405kg 

10 in 34 13.68 50.71 8.35 10.94 74 1533lb 

250 mm 864 347 1288 212 278 1880 696kg 

12 in 39 16.25 58.15 10.04 12.99 84 2508lb 

300 mm 991 413 1477 255 330 2134 1138kg 

14 in 42 17.93 64 11.02 14.25 93 3166lb 

350 mm 1066 455 1626 280 362 2362 1436kg 

16 in 47 20.56 68.15 12.64 16.26 100 4380lb 

400 mm 1194 522 1731 321 413 2540 1987kg 

18 in 53 22.75 77.28 14.09 18.31 114 6039lb 

450 mm 1346 577 1963 358 465 2896 2740kg 

20 in 58 25.12 82.83 15.63 20.31 122 8263lb 

500 mm 1473 637 2104 397 516 3099 3748kg 

24† in 66 30 100.28 18.78 24.37 148 13362lb 

600† mm 1676 761 2547 477 619 3759 6061kg 

Product No. P8A 

‘T’ Design, Butt Weld Ends 

A 

1104 0.239 P8AES125T P8AJS125T P8ALS125T 










M 

N 

C 

B 


P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1715 psi 6450 4725 6450 4725 6450 4725 

Dimensions 

bar 444 326 444 326 444 326 


‘S’ Design (Higher ∆P) Carbon Steel Alloy Steel Alloy Steel 


5 in 19 5.94 23.87 4.25 5.71 34 216lb 

125 mm 483 150 606 108 145 864 98kg 

6 in 22 7.25 30.20 5.12 6.81 42 282lb 

150 mm 559 184 767 130 173 1066 128kg 

8 in 28 8.81 31.46 6.69 8.78 46 500lb 

200 mm 711 223 799 170 223 1168 227kg 

10 in 34 11.25 43.43 8.35 10.94 62 1023lb 

250 mm 864 286 1103 212 278 1575 464kg 

12 in 39 13.69 50.71 10.04 12.99 74 1679lb 

300 mm 991 347 1288 255 330 1880 762kg 

14 in 42 16.25 58.15 11.02 14.25 84 2625lb 

350 mm 1066 413 1477 280 362 2134 1191kg 

16 in 47 17.94 64 12.64 16.26 93 3364lb 

400 mm 1194 455 1626 321 413 2362 1526kg 

18 in 53 20.56 68.15 14.09 18.31 100 5880lb 

450 mm 1346 522 1731 358 465 2540 2667kg 

20 in 58 22.75 77.28 15.63 20.31 114 6340lb 

500 mm 1473 577 1963 397 516 2896 2876kg 

24† in 66 25.12 82.83 18.78 24.37 122 8980lb 

600† mm 1676 637 2104 477 619 3099 4074kg 

Product No. P8A 

‘S’ Design, Butt Weld Ends 

A 

573 0.886 P8AES125S P8AJS125S P8ALS125S 










M 

N 

C 

B 


P 

25

26 


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2260 psi 8475 6225 8475 6225 8475 6225 

Dimensions 

bar 585 429 585 429 585 429 




5 in 21 7.75 30.31 3.86 5.71 43 359lb 

125 mm 533 197 770 98 145 1092 163kg 

6 in 24 9.12 31.42 4.65 6.81 46 568lb 

150 mm 610 232 798 118 173 1168 258kg 

8 in 30 11.25 42.95 6.14 8.78 62 1036lb 

200 mm 762 285 1091 156 223 1575 470kg 

10 in 36 13.75 50.12 7.64 10.94 72 1835lb 

250 mm 914 349 1273 194 278 1829 833kg 

12 in 41 16.43 57.52 9.17 12.99 84 2926lb 

300 mm 1041 417 1461 233 330 2134 1327kg 

14 in 44 17.87 58.70 10.08 14.25 87 3819lb 

350 mm 1117 453 1491 256 362 2210 1732kg 

16 in 49 20.62 67.36 11.54 16.26 100 5696lb 

400 mm 1245 523 1711 293 413 2540 2584kg 

18 in 55 23.31 79.25 12.91 18.31 117 8725lb 

450 mm 1397 592 2013 328 465 2972 3958kg 

20 in 60 25.06 81.85 14.25 20.31 122 10243lb 

500 mm 1524 636 2079 362 516 3099 4646kg 

24† in 68 29.93 95.67 17.13 24.37 143 16034lb 

600† mm 1727 760 2430 435 619 3632 7273kg 



A 

1168 0.145 P83ES125P P83JS125P P83LS125P 

1692 0.146 P83ES150P P83JS150P P83LS150P 

2566 0.193 P83ES200P P83JS200P P83LS200P 

4091 0.182 P83ES250P P83JS250P P83LS250P 

5926 0.180 P83ES300P P83JS300P P83LS300P 

7121 0.182 P83ES350P P83JS350P P83LS350P 

9803 0.165 P83ES400P P83JS400P P83LS400P 

13132 0.144 P83ES450P P83JS450P P83LS450P 

15039 0.163 P83ES500P P83JS500P P83LS500P 

22143 0.157 P83ES600P P83JS600P P83LS600P 

M 

N 

C 

B 


P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2260 psi 8475 6225 8475 6225 8475 6225 

Dimensions 

bar 585 429 585 429 585 429 




5 in 21 6.25 23.94 3.86 5.71 35 255lb 

125 mm 533 159 608 98 145 889 116kg 

6 in 24 7.75 30.31 4.65 6.81 43 392lb 

150 mm 610 197 770 118 173 1092 178kg 

8 in 30 9.12 31.42 6.14 8.78 46 660lb 

200 mm 762 232 798 156 223 1168 300kg 

10 in 36 11.25 42.95 7.64 10.94 62 1180lb 

250 mm 914 285 1091 194 278 1575 535kg 

12 in 41 13.75 50.12 9.17 12.99 72 2000lb 

300 mm 1041 349 1273 233 330 1829 907kg 

14 in 44 16.44 57.52 10.08 14.25 84 3050lb 

350 mm 1117 417 1461 256 362 2134 1384kg 

16 in 49 17.87 58.70 11.54 16.26 87 4165lb 

400 mm 1245 453 1491 293 413 2210 1889kg 

18 in 55 20.56 67.36 12.91 18.31 100 6100lb 

450 mm 1397 523 1711 328 465 2540 2767kg 

20 in 60 23.31 79.25 14.25 20.31 117 9200lb 

500 mm 1524 592 2013 362 516 2972 4173kg 

24† in 68 25.04 81.85 17.13 24.37 122 11100lb 

600† mm 1727 636 2079 435 619 3099 5035kg 



A 

641 0.483 P83ES125R P83JS125R P83LS125R 

1066 0.368 P83ES150R P83JS150R P83LS150R 

1435 0.617 P83ES200R P83JS200R P83LS200R 

2206 0.626 P83ES250R P83JS250R P83LS250R 

3556 0.500 P83ES300R P83JS300R P83LS300R 

5519 0.303 P83ES350R P83JS350R P83LS350R 

6392 0.388 P83ES400R P83JS400R P83LS400R 

8994 0.307 P83ES450R P83JS450R P83LS450R 

12217 0.247 P83ES500R P83JS500R P83LS500R 

12651 0.481 P83ES600R P83JS600R P83LS600R 

M 

N 

C 

B 


P 

27

28 


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2500 psi 9375 6875 9375 6875 9375 6875 

Dimensions 

bar 647 475 647 475 647 475 


‘T’ Design (Lower ∆P) Carbon Steel Alloy Steel Alloy Steel 


5 in 21 7.75 30.31 3.86 5.71 43 359lb 

125 mm 533 197 770 98 145 1092 163kg 

6 in 24 9.12 31.42 4.65 6.81 49 568lb 

150 mm 610 232 798 118 173 1168 258kg 

8 in 30 11.25 42.95 6.14 8.78 62 1036lb 

200 mm 762 285 1091 156 223 1575 470kg 

10 in 36 13.75 50.12 7.64 10.94 72 1835lb 

250 mm 914 349 1273 194 278 1829 833kg 

12 in 41 16.43 57.52 9.17 12.99 84 2926lb 

300 mm 1041 417 1461 233 330 2134 1327kg 

14 in 44 17.87 58.70 10.08 14.25 87 3819lb 

350 mm 1117 453 1491 256 362 2210 1732kg 

16 in 49 20.62 67.36 11.54 16.26 100 5696lb 

400 mm 1245 523 1711 293 413 2540 2584kg 

18 in 55 23.31 79.25 12.91 18.31 117 8725lb 

450 mm 1397 592 2013 328 465 2972 3958kg 

20 in 60 25.06 81.85 14.25 20.31 122 10243lb 

500 mm 1524 636 2079 362 516 3099 4646kg 

24† in 68 29.93 95.67 17.13 24.37 143 16034lb 

600† mm 1727 760 2430 435 619 3632 7273kg 


‘T’ Design, Butt Weld Ends 

A 

1168 0.145 P91ES125T P91JS125T P91LS125T 

1692 0.146 P91ES150T P91JS150T P91LS150T 

2566 0.193 P91ES200T P91JS200T P91LS200T 

4091 0.182 P91ES250T P91JS250T P91LS250T 

5926 0.180 P91ES300T P91JS300T P91LS300T 

7121 0.182 P91ES350T P91JS350T P91LS350T 

9803 0.165 P91ES400T P91JS400T P91LS400T 

13132 0.144 P91ES450T P91JS450T P91LS450T 

15039 0.163 P91ES500T P91JS500T P91LS500T 

22143 0.157 P91ES600T P91JS600T P91LS600T 

M 

N 


C 

B 

P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2500 psi 9375 6875 9375 6875 9375 6875 

Dimensions 

bar 647 475 647 475 647 475 

* Per ASME B16.10 1992 † 20” & 24” Nominal sizes not shown in ASME B16.10 Product Numbers 

‘S’ Design (Higher ∆P) Carbon Steel Alloy Steel Alloy Steel 


5 in 21 6.57 23.94 3.82 5.71 35 255lb 

125 mm 533 167 608 97 145 889 116kg 

6 in 24 8.18 30.31 4.53 6.81 43 392lb 

150 mm 610 208 770 115 173 1092 178kg 

8 in 30 10.43 36.73 5.91 8.78 54 926lb 

200 mm 762 265 933 150 223 1372 420kg 

10 in 36 12.83 44 7.36 10.94 64 1705lb 

250 mm 914 326 1118 187 278 1626 773kg 

12 in 41 15.43 51.34 8.74 12.99 75 2761lb 

300 mm 1041 392 1304 222 330 1905 1252kg 

14 in 44 16.42 57.52 9.61 14.25 84 3050lb 

350 mm 1117 417 1461 244 362 2134 1383kg 

16 in 49 19.57 64.57 10.98 16.26 95 5515lb 

400 mm 1245 497 1640 279 413 2413 2501kg 

18 in 55 20.59 67.36 12.36 18.31 100 6100lb 

450 mm 1397 523 1711 314 465 2540 2767kg 

20† in 60 23.31 79.25 13.74 20.31 117 9200lb 

500† mm 1524 592 2013 349 516 2972 4172kg 

24† in 68 28 89.57 16.50 24.37 133 15679lb 

600† mm 1727 713 2275 419 619 3378 7111kg 


‘S’ Design, Butt Weld Ends 

A 

640 0.464 P91ES125S P91JS125S P91LS125S 

1078 0.324 P91ES150S P91JS150S P91LS150S 

1931 0.292 P91ES200S P91JS200S P91LS200S 

3100 0.273 P91ES250S P91JS250S P91LS250S 

4785 0.228 P91ES300S P91JS300S P91LS300S 

5771 0.229 P91ES350S P91JS350S P91LS350S 

8137 0.196 P91ES400S P91JS400S P91LS400S 

9395 0.236 P91ES450S P91JS450S P91LS450S 

12638 0.199 P91ES500S P91JS500S P91LS500S 

17121 0.226 P91ES600S P91JS600S P91LS600S 

M 

N 

C 

B 


P 

29

30 


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 


Handwheel Cast Iron /Steel 

Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2850 psi 10700 7900 10700 7900 10700 7900 

Dimensions 

bar 737 541 737 541 737 541 

* Per ASME B16.10 1992 † 20” & 24” Nominal sizes not shown in ASME B16.10 Product Numbers 



5 in 21 6.62 23.94 3.46 5.71 35 295lb 

125 mm 533 169 608 88 145 889 134kg 

6 in 24 8.18 30.31 4.17 6.81 43 528lb 

150 mm 610 208 770 106 173 1092 240kg 

8 in 30 10.75 36.73 5.51 8.78 54 1058lb 

200 mm 762 273 933 140 223 1372 480kg 

10 in 36 13.18 44 6.89 10.94 64 1907lb 

250 mm 914 334 1118 175 278 1626 865kg 

12 in 41 15.93 51.34 8.23 12.99 75 3133lb 

300 mm 1041 404 1304 209 330 1905 1421kg 

14 in 44 17.43 57.52 9.06 14.25 84 4160lb 

350 mm 1117 442 1461 230 362 2134 1887kg 

16 in 49 20.25 64.57 10.39 16.26 95 6345lb 

400 mm 1245 514 1640 264 413 2413 2878kg 

18 in 55 21.81 67.36 11.61 18.31 100 8160lb 

450 mm 1397 554 1711 295 465 2540 3701kg 

20† in 60 24.68 79.25 12.83 20.31 117 12300lb 

500† mm 1524 627 2013 326 516 2972 5580kg 

24† in 68 28.68 89.57 15.47 24.37 133 17668lb 

600† mm 1727 728 2275 393 619 3378 8014kg 



A 

683 0.274 P95ES125P P95JS125P P95LS125P 

1135 0.210 P95ES150P P95JS150P P95LS150P 

2020 0.202 P95ES200P P95JS200P P95LS200P 

3231 0.193 P95ES250P P95JS250P P95LS250P 

4956 0.167 P95ES300P P95JS300P P95LS300P 

5988 0.168 P95ES350P P95JS350P P95LS350P 

8390 0.148 P95ES400P P95JS400P P95LS400P 

9804 0.169 P95ES450P P95JS450P P95LS450P 

13201 0.139 P95ES500P P95JS500P P95LS500P 

17889 0.160 P95ES600P P95JS600P P95LS600P 

M 

N 

C 

B 


P


Sizes 5”– 24” 





Bonnet A105 A182 F11 A182 F22 




Seats A105 A182 F22 A182 F22 



Disc A105 A182 F22 A182 F22 


Pressure 

Seal Ring 



Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2850 psi 10700 7900 10700 7900 10700 7900 

Dimensions 

bar 737 541 737 541 737 541 

* Per ASME B16.10 1992 † 20’ & 24” Nominal sizes not shown in ASME B16.10 Product Numbers 



6 in 24 6.62 23.94 4.17 6.81 35 332lb 

150 mm 610 169 608 106 173 889 151kg 

8 in 30 8.19 30.31 5.51 8.78 43 630lb 

200 mm 762 208 770 140 223 1092 286kg 

10 in 36 10.75 36.73 6.89 10.94 54 1220lb 

250 mm 914 273 933 175 278 1372 554kg 

12 in 41 13.19 44 8.23 12.99 64 2100lb 

300 mm 1041 334 1118 209 330 1626 953kg 

14 in 44 15.94 51.34 9.06 14.25 75 3270lb 

350 mm 1117 404 1304 230 362 1905 1484kg 

16 in 49 17.44 57.52 10.39 16.26 84 4440lb 

400 mm 1245 442 1461 264 413 2134 2014kg 

18 in 55 20.25 64.57 11.61 18.31 95 6780lb 

450 mm 1397 514 1640 295 465 2413 3076kg 

20† in 60 21.81 67.36 12.83 20.31 100 8610lb 

500† mm 1524 554 1711 326 516 2540 3906kg 

24† in 68 24.69 79.25 15.47 24.37 117 13280lb 

600† mm 1727 627 2013 393 619 2972 6024kg 



A 

606 0.736 P95ES150R P95JS150R P95LS150R 

954 0.905 P95ES200R P95JS200R P95LS200R 

1741 0.665 P95ES250R P95JS250R P95LS250R 

2844 0.507 P95ES300R P95JS300R P95LS300R 

4655 0.278 P95ES350R P95JS350R P95LS350R 

5402 0.357 P95ES400R P95JS400R P95LS400R 

7814 0.266 P95ES450R P95JS450R P95LS450R 

9093 0.293 P95ES500R P95JS500R P95LS500R 

11272 0.403 P95ES600R P95JS600R P95LS600R 

M 

N 

C 

B 


P 

31

32 

Parallel Slide Gate Valve Accessories 

Operators…. 

Dewrance Parallel Slide Gate Valves can be equipped with 

gear operators – when handwheel rim torque exceeds 50 

lbs. push and 50 lbs. pull. Bevel gear; bevel and spur gear; 

and spur gear operators are available. 

Power operators – All Dewrance Parallel Slide Gate Valves 

may be adapted for motor operators, pneumatic or 

hydraulic cylinders. The low torque requirements and the 

position seating of the Dewrance Valve provides economic 

power operator sizing. When ordering, the following 

information should be supplied: 

● Operating pressure/temperature 

● Differential pressure 

● System fluid 

● Operation time 

● Control voltage 

● System power supply 

● Required enclosure type 

● Additional electrical features 

Parallel Slide Valves for Regulating Duty 

If a valve is required for flow regulation duties 

Dewrance can supply a parallel slide valve fitted with a 

“vee-ported” seat, and special pattern discs. The 

upstream seat is drilled to provide a pressure equalizing 

feature and the valve becomes unidirectional. 

By-Pass Valves…. 

Dewrance Parallel Slide Gate Valves can be fitted with By- 

Pass Valves when specified by the customer. Dewrance By- 

Pass Valves have a parallel slide gate design with a 

pressure seal bonnet, a forged body, butt-weld ends, can 

be motor operated and are in accordance with MSS-SP-45. 

By-pass, equalizing by-pass, equalizing pipe and drain 

arrangements are available to suit customer design 

installation. Application requests should include the 

following additional information: 

● Unidirectional or bidirectional flow 

● Main valve installation position 

● Piping variations or restriction unique to your design. 

Valve disc 

View through outlet of 

Vee-port Seated Valve 

Valve seat

High pressure 

Forged Steel 


Sizes 3/4” – 4” 

ASME B16.34 – 1996 

Pressure Class: 1690, 2850, 4500 

33

34 



Sizes 3 ⁄4” – 4” 

ASME B16.34 – 1996 





● Welded-in seats, hard-faced with Stellite ® or 

Equivalent 


● Expanded graphite pressure seal / gasket & gland 

packing 







● Lower pressure drop characteristic than wedge gate 

valve 


wedge gate 




Class 4500 

● Drain Service 

● Vent Service 



● Steam Turbine Drain Systems 

Class 1690, 2850 



● H.P. Feed Heater Isolation & By-Pass 







● Attemperator Spray 

● Steam Blow and Start Up 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Cast iron handwheel 

Aluminium bronze yolk sleeve, stainless steel 

spindle with double acme thread for smooth 

quick operation 

Positive stop also serves as open/shut indicator 

Forged steel body and bonnet 

Nimonic alloy disc spring 

Anti-friction washers reduce wear in moving 

parts. (On 4500 Class – Thrust bearings for 

ease of operation) 

Aluminium bronze gland bush self-aligning for 

straight line thrust against packing 

Expanded graphite gland packing and gasket 

Stellite ® seat facings with sufficient material to 

allow repeated lapping 

Stellite ® deposited discs ensure positive 

isolation 



1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

35

36 

Forged Steel Parallel Slide Gate Valves 

Sizes 3 ⁄4”– 2” 



Description Carbon Steel Alloy Steel 

Body A105 A182 F22 

Bonnet A105 A182 F22 

Stem A565-XM32 A565-XM32 


Seats A105 A182 F22 


Handwheel A126, Class A A126, Class A 

Disc A182-347 A182-347 


Bonnet Seal 

Gasket 



Material 

Press. ASTM ASTM 

Class 

A-105 A-182-F22 

Shell Seat Shell Seat 

1690 psi 6350 4650 6350 4650 

bar 438 321 438 321 

Dimensions - BUTT WELD END 

* Per ASME B16.10 


‘R & S’ Design, Butt Weld & 

Socket Weld Ends 

P 

C 

B 

A 

Product Numbers 

M N 

Carbon Steel Alloy Steel 

Size A* B C M N P Weight A105 F22 

3 ⁄4 in 9.13 1.61 10.9 0.61 1.05 13.9 31lb 

20 mm 232 41 278 15.6 26.7 353 14kg 

1 in 9.13 1.61 10.9 0.81 1.32 13.9 31lb 

25 mm 232 41 278 20.7 33.4 353 14kg 

1 1 ⁄4 in 9.13 2.17 13.9 1.16 1.66 17.24 54lb 

32 mm 232 55 353 29.5 42.2 438 24.5kg 

1 1 ⁄2 in 9.13 2.17 13.9 1.34 1.90 17.24 54lb 

40 mm 232 55 353 34.0 48.3 438 24.5kg 

2 in 9.13 2.17 13.9 1.7 2.37 17.24 54lb 

50 mm 232 55 353 42.8 60.3 438 24.5kg 

Dimensions - SOCKET WELD END 

P73DS020R P73KS020R 





Size A* B C R P Weight A105 F22 

3 ⁄4 in 9.13 1.61 10.9 2.32 13.9 31lb 

20 mm 232 41 278 59 353 14kg 

1 in 9.13 1.61 10.9 2.32 13.9 31lb 

25 mm 232 41 278 59 353 14kg 

1 1 ⁄4 in 9.13 2.17 13.9 2.91 17.24 54lb 

32 mm 232 55 353 74 438 24.5kg 

1 1 ⁄2 in 9.13 2.17 13.9 2.91 17.24 54lb 

40 mm 232 55 353 74 438 24.5kg 

2 in 9.13 2.17 13.9 3.86 17.24 54lb 

50 mm 232 55 353 98 438 24.5kg 


Socket Weld Ends Valve Size 3 ⁄4” 1” 1 1⁄4” 1 1⁄2” 2” 

X Socket Dia. 1.07” 1.33” 1.68” 1.92” 2.41” 

Depth of 

Y Socket 0.5” 0.5” 0.5” 0.5” 0.62” 

Z Wall Thickness 0.63” 0.5” 0.62” 0.5” 0.73” 

P73DS020S P73KS020S 




P73DS050S P73KS050S


Sizes 3 ⁄4”– 2” 




Body A105 A182 F22 


Stem A565-XM32 A565-XM32 

Gland Aluminium Bronze ASTM B150 C63000 


Yoke Sleeve Aluminium Bronze ASTM B150 C63000 


Disc A182-347 A182-347 


Bonnet Seal 

Gasket 



Material 


Class 

A-105 A-182-F22 


2850 psi 10700 7900 10700 7900 

bar 737 541 737 541 

Dimensions - BUTT WELD END 



‘R & S’ Design, Butt Weld & 



P 

C 

B 


A 

M N 

Valve Size 3 ⁄4” 1” 1 1 ⁄4” 1 1 ⁄2” 2” 

X Socket Dia. 1.07” 1.33” 1.68” 1.92” 2.41” 

Depth of 

Y Socket 0.5” 0.5” 0.5” 0.5” 0.62” 

Z Wall Thickness 0.63” 0.5” 0.62” 0.5” 0.73” 



Size A* B C M N P Weight A105 F22 

3 ⁄4 in 9.13 1.61 10.9 0.44 1.05 13.9 31lb 

20 mm 232 41 278 11.05 26.7 353 14kg 

1 in 9.13 1.61 10.9 0.60 1.32 13.9 31lb 

25 mm 232 41 278 15.2 33.4 353 14kg 

1 1 ⁄4 in 9.13 1.61 10.9 0.90 1.66 13.9 31lb 

32 mm 232 41 278 22.8 42.2 353 14kg 

1 1 ⁄2 in 9.13 2.17 13.9 1.10 1.90 17.24 54lb 

40 mm 232 55 353 28 48.3 438 24.5kg 

2 in 9.13 2.17 13.9 1.5 2.37 17.24 54lb 

50 mm 232 55 353 38.1 60.3 438 24.5kg 

Dimensions - SOCKET WELD END 






Size A* B C R P Weight A105 F22 

3 ⁄4 in 9.13 1.61 10.9 2.32 13.9 31lb 

20 mm 232 41 278 59 353 14kg 

1 in 9.13 1.61 10.9 2.32 13.9 31lb 

25 mm 232 41 278 59 353 14kg 

1 1 ⁄4 in 9.13 1.61 10.9 2.91 13.9 31lb 

32 mm 232 41 278 74 353 14kg 

1 1 ⁄2 in 9.13 2.17 13.9 2.91 17.24 54lb 

40 mm 232 55 353 74 438 24.5kg 

2 in 9.13 2.17 13.9 3.86 17.24 54lb 

50 mm 232 55 353 98 438 24.5kg 






37

38 


Sizes 2”– 4” 




Body A105 A182 F22 


Cover A516 Gr. 60 A387 Gr. 11 

Stem AISI 431 A565-XM32 

Gland Aluminium Bronze ASTM B150 C63000 




Disc BS 970 420S29 AISI 347 


Pressure 

Seal ring 



Material 


Class 

A-105 A-182-F22 


1690 psi 6350 4650 6350 4650 

Dimensions 

bar 438 321 438 321 

* Per ASME B16.10 Product Numbers 



A 

M N 

C 

P 


Size A* B C M N P Weight Cv K Factor A105 F22 

2 in 8.5 1.93 13.58 1.42 2.48 18 90lb 

50 mm 216 49 345 36 63 457 41kg 

2 1 ⁄2 in 10 2.24 13.58 1.65 2.99 18 115lb 

65 mm 254 57 345 42 76 457 53kg 

3 in 12 2.6 16.93 2.17 3.58 28 141lb 

80 mm 305 66 430 55 91 711 64kg 

4 in 16 3.11 22.05 2.99 4.61 28 247lb 

100 mm 406 79 560 76 117 711 112kg 


140 0.187 P73DS050P P73KS050P 

151 0.293 P73DS065P P73KS065P 

327 0.204 P73DS080P P73KS080P 

549 0.239 P73DS100P P73KS100P 

B


Sizes 2”– 4” 




Body A105 A182 F22 


Cover A516 Gr. 60 A387 Gr. 11 

Stem AISI 431 A565-XM32 





Disc BS970 420529 AISI 347 


Pressure 

Seal Ring 



Material 


Class 

A-105 A-182-F22 


2850 psi 10700 7900 10700 7900 

Dimensions 

bar 737 541 737 541 





Size A* B C M N P Weight Cv K Factor A105 F22 

2 in 11 1.93 13.31 1.14 2.48 18 99lb 

50 mm 279 49 338 29 63 457 45kg 

2 1 ⁄2 in 13 2.24 13.31 1.38 2.99 18 121lb 

65 mm 330 57 338 35 76 457 55kg 

3 in 14.5 2.6 16.61 1.65 3.58 21 150lb 

80 mm 368 66 422 42 91 533 68kg 

4 in 18 3.11 19.88 2.13 4.61 25 254lb 

100 mm 457 79 505 54 117 635 115kg 

A 

M N 


91 0.182 P95DS050P P95KS050P 

105 0.295 P95DS065P P95KS065P 

194 0.177 P95DS080P P95KS080P 

323 0.176 P95DS100P P95KS100P 

C 

B 

P 

39

40 


Sizes 1”– 4” 



Dimensions 


Material 

Press. ASTM 

Class 

A-182-F22 

Shell Seat 

4500 psi 16875 12375 

bar 1164 854 


Description Alloy Steel 

Body A182 F22 

Bonnet A182 F22 

Cover A387 Gr. 11 

Stem A565-XM32 


Seats A182 F22 


Handwheel A126, Class A 

Disc A182 F22 


Pressure 

Seal Ring 


Valve Size 1” 1 1 ⁄2” 2” 

A Socket Dia. 1.33” 1.92” 2.41” 

B Depth of Socket 1 ⁄2” 1 ⁄2” 1 ⁄2” 

C Wall Thickness 1.5” 1.205” 0.96” 


BUTT WELD SOCKET WELD 

Alloy Steel Alloy Steel 

Size A* B C M N P Weight F22 F22 

1 in 12 3.27 16.14 0.51 4.21 20.91 148lb 

25 mm 305 83 410 13 107 531 67kg 

1 1 ⁄2 in 12 3.27 17.1 0.79 4.21 22.05 148lb 

40 mm 305 83 434 20 107 560 67kg 

2 in 12 3.27 17.1 1.25 4.21 22.05 148lb 

50 mm 305 83 434 31.8 107 560 67kg 

2 1 ⁄2 in 18 5.5 26.97 1.78 6.26 35.16 496lb 

65 mm 457 141 685 45.2 159 893 225kg 

3 in 18 5.5 26.97 2.31 6.26 35.16 496lb 

80 mm 457 141 685 58.7 159 893 225kg 

4 in 18 5.5 26.97 3.16 6.26 35.16 496lb 

100 mm 457 141 685 80.2 159 893 225kg 

Product No. PX7 

‘P & S’ Design, Butt Weld & 



P 

C 

B 


A 

M N 

PX7KS025P PX7KS025S 






6in / 150mm valve available on request

Low pressure 

Cast Steel 


Sizes 2” – 20” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 


41

42 



Sizes 2” – 20” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 






Equivalent 








● Lower pressure drop characteristic than wedge 

gate valve 


wedge gate 




● L.P. Steam Isolation 


● L.P. Feed Heater Isolation & By-Pass 









1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

Four pillar design on 300 & 600 class for 

rigidity and accessibility. 

(Two pillar design on 150 class) 

Stem stop clearly indicates valve position & 

prevents stem rotation. 

Aluminium reinforced expanded graphite 

gasket located in tongue and groove. 

Hard faced Stellite ® or equivalent discs and 

seats. 

Anti-friction bearings are fitted for direct 

handwheel operation. 

Two piece gland. 

Specially designed stuffing box to suit 

expanded graphite packing. 

Hard faced Stellite ® or equivalent back seat. 

Disc Retainer. 

Spring or springs to hold disc against seat face 

for initial sealing. 

Modular body design accommodates a wide 

range of flanged and weld connections. 



1 

2 

3 

4 

By-pass and Drains can be supplied 

as required. 

5 

6 

7 

8 

9 

10 

11 

43

44 


Sizes 2 1 ⁄2”– 24” 



Description Carbon Steel 

Body A216 Gr WCB 

Bonnet A216 Gr WCB 

Stem AISI 431 

Gland Aluminium – Bronze 

Seats A105 

Yoke Sleeve Aluminium – Bronze 


Disc A516 Gr 70 


Gasket Reinforced Expanded Graphite 


Press. 

Body Material 

ASTM 

Class 

A-216 WCB 

Shell Seat 

150 psi 450 325 

Dimensions 

bar 30 22 

Size A B C M N P Weight Cv K Factor Product Numbers 

2 1 ⁄2 in 9.5 2.6 19.4 2.36 3.74 24.21 65lb 

65 mm 241 66 492 60 95 615 29 

3 in 11.12 2.6 19.4 2.87 3.74 24.21 65lb 

80 mm 282 66 492 73 95 615 29kg 

4 in 12 3.1 22 3.78 4.80 27.05 91lb 

100 mm 305 79 558 96 122 687 42kg 

6 in 15.88 4.3 31.4 5.79 6.81 36.77 148lb 

150 mm 403 109 798 147 173 934 67kg 

8 in 16.5 5.6 39.6 7.80 8.70 46.06 304lb 

200 mm 419 143 1005 198 221 1170 138kg 

10 in 18 6.8 48.7 10.04 10.98 55.67 507lb 

250 mm 457 173 1236 255 279 1414 230kg 

12 in 19.75 7.9 55.9 11.97 12.99 63.78 683lb 

300 mm 502 200 1419 304 330 1620 310kg 

14 in 22.5 8.6 61.5 13.03 14.09 70.39 772lb 

350 mm 572 219 1562 331 358 1788 350kg 

16 in 24 9.8 69.8 14.96 16.10 79.53 1240lb 

400 mm 610 248 1772 380 409 2020 564kg 

18 in 26 11 79.5 16.96 18.11 91.26 1610lb 

450 mm 660 279 2018 431 460 2318 732kg 

20 in 28 12 85 18.78 20.16 97.20 2135lb 

500 mm 711 304 2159 477 512 2469 970kg 

24 in 32 14.5 102.2 22.83 24.21 116.65 2597lb 

600 mm 813 367 2595 580 615 2963 1178kg 




P 

C 

B 

N M 

A 

447 0.139 P21ES065R 

545 0.204 P21ES080R 

948 0.203 P21ES100R 

2362 0.180 P21ES150R 

4399 0.171 P21ES200R 

7084 0.181 P21ES250R 

10154 0.178 P21ES300R 

12894 0.155 P21ES350R 

17573 0.145 P21ES400R 

23611 0.133 P21ES450R 

29591 0.127 P21ES500R 

46360 0.113 P21ES600R


Sizes 2 1 ⁄2”– 24” 



Description Carbon Steel 

Body A216 Gr WCB 

Bonnet A216 Gr WCB 

Stem AISI 431 

Gland Aluminium – Bronze 

Seats A105 

Yoke Sleeve Aluminium – Bronze 


Disc A516 Gr 70 


Gasket Reinforced Expanded Graphite 


Press. 

Body Material 

ASTM 

Class 

A-216 WCB 


Flanged Ends 

Shell Seat 

150 psi 450 325 

Dimensions 

bar 30 22 

Size A C M N P Weight Cv K Factor Product Numbers 

*2 1 ⁄2 in 8 19.4 2.5 7 24.21 70lb 

65 mm 203 492 63 178 615 32kg 

3 in 8 19.4 3 7.5 24.21 77lb 

80 mm 203 492 76 191 615 35kg 

4 in 9 22 4 9 27.05 143lb 

100 mm 229 558 102 229 687 65kg 

6 in 10.5 31.4 6 11 36.77 220lb 

150 mm 267 798 152 279 934 100kg 

8 in 11.5 39.6 8 13.5 46.06 364lb 

200 mm 292 1005 203 343 1170 165kg 

10 in 13 48.7 10 16 55.67 627lb 

250 mm 330 1236 254 406 1414 285kg 

12 in 14 55.9 12 19 63.78 814lb 

300 mm 356 1419 305 483 1620 370kg 

14 in 15 61.5 13.25 21.0 70.39 946lb 

350 mm 381 1562 337 533 1788 430kg 

16 in 16 69.8 15.25 23.5 79.53 1300lb 

400 mm 406 1772 387 597 2020 591kg 

18 in 17 79.5 17.25 25 91.26 1562lb 

450 mm 432 2018 438 635 2318 710kg 

20 in 18 85 19.25 27.5 97.20 2362lb 

500 mm 457 2159 489 699 2469 1074kg 

24 in 20 102.2 23.25 32 116.65 3296lb 

600 mm 508 2595 591 813 2963 1495kg 

* NOTE: Overall length not to ASME B16.10 1986 


P 

C 

N M 

A 

501 0.139 P22ES65R 

523 0.265 P22ES80R 

940 0.259 P22ES100R 

2285 0.222 P22ES150R 

4279 0.200 P22ES200R 

7087 0.178 P22ES250R 

10092 0.182 P22ES300R 

13002 0.163 P22ES350R 

17439 0.159 P22ES400R 

23611 0.142 P22ES450R 

29935 0.137 P22ES500R 

47456 0.116 P22ES600R 

45

46 


Sizes 2”– 20” 




Body A216 Gr WCB A217 Gr WC6 

Bonnet A216 Gr WCB A217 Gr WC6 

Stem AISI 431 AISI 431 

Gland Aluminium – Bronze ASTM B150 630 

Seats A106 A182-F22 

Yoke Sleeve Aluminium – Bronze ASTM B150 630 


Disc A516 Gr 70 A387 Gr 11 


Gasket Expanded Graphite 


Body Material 


Class 

A-216 WCB A-217 WC6 


300 psi 1125 825 1125 825 

Dimensions 

bar 78 57 78 57 





Size A B C M N P Weight Cv K Factor WCB WC6 

2 in 8.5 2.09 16.93 2.07 2.38 20.35 62lb 

50 mm 216 53 430 52.6 60.3 517 28.2kg 

2 1 ⁄2 in 9.5 2.09 16.93 2.47 2.88 20.35 64lb 

65 mm 241 53 430 62.7 73.2 517 29.1kg 

3 in 11.13 2.44 19.92 3.07 3.50 23.23 84lb 

80 mm 283 62 506 78 88.9 590 38.2kg 

4 in 12 3.19 23.4 4.03 4.5 26.81 130lb 

100 mm 305 81 594 102.0 114.3 681 59kg 

6 in 15.88 4.02 31.93 6.06 6.63 37.17 258lb 

150 mm 403 102 811 154 168.3 944 117kg 

8 in 16.5 5.20 40.59 8 8.63 47.44 359lb 

200 mm 419 132 1031 203 219.1 1205 163kg 

10 in 18 6.50 48.38 10.02 10.75 56.81 724lb 

250 mm 457 165 1229 254.4 273 1443 329kg 

12 in 19.75 7.64 57.17 11.94 12.75 67.20 939lb 

300 mm 502 194 1452 303.2 323.9 1707 426kg 

14 in 30 8.07 60.79 13.12 14 71.30 1314lb 

350 mm 762 205 1544 333.3 355.6 1811 597kg 

16 in 33 8.78 68.39 15 16 79.96 1772lb 

400 mm 838 223 1737 381 406.4 2031 805kg 

18 in 36 9.96 77.87 16.88 18 91.18 2300lb 

450 mm 914 253 1978 428.6 457.2 2316 1045kg 

20 in 39 11 83.66 18.81 20 97.64 3056lb 

500 mm 991 279 2125 477.8 508 2480 1386kg 

C 

B 

N M 

A 


302 0.180 P31ES050P P31JS050P 

266 0.471 P31ES065P P31JS065P 

550 0.263 P31ES080P P31JS080P 

972 0.247 P31ES100P P31JS100P 

2246 0.239 P31ES150P P31JS150P 

3906 0.240 P31ES200P P31JS200P 

5808 0.265 P31ES250P P31JS250P 

8668 0.241 P31ES300P P31JS300P 

10882 0.223 P31ES350P P31JS350P 

14932 0.203 P31ES400P P31JS400P 

18591 0.210 P31ES450P P31JS450P 

23740 0.199 P31ES500P P31JS500P 

P


Sizes 2”– 20” 











Disc A516 Gr 70 A387 Gr 11 




Body Material 


Class 

A-216 WCB A-217 WC6 


300 psi 1125 825 1125 825 

Dimensions 

bar 78 57 78 57 


‘P’ Design, Flanged Ends 



Size A C M N P Weight Cv K Factor WCB WC6 

2 in 8.5 16.93 2.07 6.5 20.35 77lb 

50 mm 216 430 52.6 165 517 35kg 

2 1 ⁄2 in 9.5 16.93 2.47 7.5 20.35 81lb 

65 mm 241 430 62.7 191 517 37kg 

3 in 11.13 19.92 3.07 8.25 23.25 111lb 

80 mm 283 506 78 210 590 50kg 

4 in 12 23.4 4.03 10 26.81 198lb 

100 mm 305 594 102 254 681 90kg 

6 in 15.88 31.93 6.06 12.5 37.17 319lb 

150 mm 403 811 154 318 944 145kg 

8 in 16.5 40.59 8 15 47.44 508lb 

200 mm 419 1031 203 381 1205 231kg 

10 in 18 48.38 10.02 17.5 56.81 887lb 

250 mm 457 1229 254.4 445 1443 403kg 

12 in 19.75 57.17 11.94 20.5 67.2 1180lb 

300 mm 502 1452 303.2 521 1707 536kg 

14 in 30 60.79 13.12 23 71.30 1622lb 

350 mm 762 1544 333.3 584 1811 737kg 

16 in 33 68.39 15 25.5 79.96 2168lb 

400 mm 838 1737 381 648 2031 985kg 

18 in 36 77.87 16.88 28 91.18 2793lb 

450 mm 914 1978 428.6 711 23.16 1270kg 

20 in 39 83.66 18.81 30.5 97.64 3635lb 

500 mm 991 2125 477.8 775 2480 1652kg 

C 

N M 

A 


302 0.180 P32ES050P P32JS050P 

266 0.471 P32ES065P P32JS065P 

550 0.263 P32ES080P P32JS080P 

972 0.247 P32ES100P P32JS100P 

2246 0.239 P32ES150P P32JS150P 

3906 0.240 P32ES200P P32JS200P 

5808 0.265 P32ES250P P32JS250P 

8668 0.241 P32ES300P P32JS300P 

10882 0.223 P32ES350P P32JS350P 

14932 0.203 P32ES400P P32JS400P 

18591 0.210 P32ES450P P32JS450P 

23740 0.199 P32ES500P P32JS500P 

P 

47

48 


Sizes 2”– 20” 











Disc A516 Gr 70 A387 Gr 11 




Dimensions 

Material 


Class 

A-216 WCB A-217-WC6 


600 psi 2250 1650 2250 1650 

bar 156 114 156 114 



Size A B C M N P Weight Cv K Factor WCB WC6 

2 in 11.5 2.06 16.93 1.94 2.38 20.35 65lb 

50 mm 292 52 430 49.3 60.3 517 29.5kg 

2 1 ⁄2 in 13 2.06 16.93 2.32 2.88 20.35 69lb 

65 mm 330 52 430 58.9 73.2 517 31.4kg 

3 in 14 2.44 19.92 2.9 3.5 23.23 89lb 

80 mm 356 62 506 73.7 88.9 590 40.5kg 

4 in 17 3.25 23.4 3.83 4.5 26.81 135lb 

100 mm 432 82 594 97.3 114.3 681 61.4kg 

6 in 22 4.13 31.93 5.76 6.63 37.17 293lb 

150 mm 559 104 811 146 168.3 944 133kg 

8 in 26 5.38 40.59 7.63 8.63 47.44 477lb 

200 mm 660 136 1031 194 219.1 1205 217kg 

10 in 31 6.5 48.38 9.56 10.75 56.81 802lb 

250 mm 787 164 1229 243 273 1443 365kg 

12 in 33 7.63 57.17 11.38 12.75 67.20 1116lb 

300 mm 838 194 1452 289 323.9 1707 507kg 

14 in 35 8.5 60.79 12.5 14 71.30 1477lb 

350 mm 889 215 1544 318 355.6 1811 671kg 

16 in 39 9.25 68.39 14.31 16 79.96 1932lb 

400 mm 991 235 1737 363 406.4 2031 878kg 

18 in 43 10.31 77.87 16.13 18 91.18 2500lb 

450 mm 1092 262 1978 410 457.2 2316 1136kg 

20 in 47 11.38 83.66 17.94 20 97.64 3275lb 

500 mm 1194 289 2125 456 508 2480 1489lb 



C 

B 

N M 

A 


275 0.167 P51ES050P P51JS050P 

306 0.276 P51ES065P P51JS065P 

633 0.158 P51ES080P P51JS080P 

1152 0.145 P51ES100P P51JS100P 

2670 0.138 P51ES150P P51JS150P 

4809 0.131 P51ES200P P51JS200P 

7698 0.126 P51ES250P P51JS250P 

11086 0.122 P51ES300P P51JS300P 

13543 0.119 P51ES350P P51JS350P 

18027 0.116 P51ES400P P51JS400P 

23040 0.114 P51ES450P P51JS450P 

28884 0.111 P51ES500P P51JS500P 

P


Sizes 2”– 20” 











Disc A516 Gr 70 A387 Gr 11 




Material 


Class 

A-216 WCB A-217-WC6 


600 psi 2250 1650 2250 1650 

Dimensions 

bar 156 114 156 114 


‘P’ Design, Flanged Ends 



Size A C M N P Weight Cv K Factor WCB WC6 

2 in 11.5 16.93 1.97 6.5 20.35 85lb 

50 mm 292 430 50 165 517 38.6kg 

2 1 ⁄2 in 13 16.93 2.32 7.5 20.35 93lb 

65 mm 330 430 58.9 191 517 42.3kg 

3 in 14 19.92 2.93 8.25 23.23 121lb 

80 mm 356 506 74.4 210 590 55kg 

4 in 17 23.4 3.86 10.75 26.81 205lb 

100 mm 432 594 98 273 681 93.2kg 

6 in 22 31.93 5.82 14 37.17 430lb 

150 mm 559 811 147.8 356 944 195kg 

8 in 26 40.59 7.72 16.5 47.44 687lb 

200 mm 660 1031 196 419 1205 312kg 

10 in 31 48.38 9.66 20 56.81 1137lb 

250 mm 787 1229 245 508 1443 516kg 

12 in 33 57.17 11.49 22 67.20 1488lb 

300 mm 838 1452 292 559 1707 675kg 

14 in 35 60.79 12.64 23.75 71.30 1820lb 

350 mm 889 1544 321 603 1811 826kg 

16 in 39 68.39 14.47 27 79.96 2545lb 

400 mm 991 1737 367.5 686 2031 1154kg 

18 in 43 77.87 16.13 29.25 91.18 3280lb 

450 mm 1092 1978 410 743 2316 1488kg 

20 in 47 83.66 17.94 32 97.64 4250lb 

500 mm 1194 2125 456 813 2480 1928kg 

C 

N M 

A 


275 0.167 P52ES050P P52JS050P 

306 0.276 P52ES065P P52JS065P 

633 0.158 P52ES080P P52JS080P 

1152 0.145 P52ES100P P52JS100P 

2670 0.138 P52ES150P P52JS150P 

4809 0.131 P52ES200P P52JS200P 

7698 0.126 P52ES250P P52JS250P 

11086 0.122 P52ES300P P52JS300P 

13543 0.119 P52ES350P P52JS350P 

18027 0.116 P52ES400P P52JS400P 

23040 0.114 P52ES450P P52JS450P 

28884 0.111 P52ES500P P52JS500P 

P 

49

50 Parallel Slide Gate Valve Accessories 

Operators…. 

Dewrance Parallel Slide Gate Valves can be equipped with 

gear operators – when handwheel rim torque exceeds 50 

lbs. push and 50 lbs. pull. Bevel gear; bevel and spur gear; 

and spur gear operators are available. 

Power operators – All Dewrance Parallel Slide Gate Valves 

may be adapted for motor operators, pneumatic or 

hydraulic cylinders. The low torque requirements and the 

position seating of the Dewrance Valve provides economic 

power operator sizing. 

Parallel Slide Valves for Regulating Duty 

If a valve is required for flow regulation duties 

Dewrance can supply a parallel slide valve fitted with a 

“vee-ported” seat, and special pattern discs. The 

upstream seat is drilled to provide a pressure equalizing 

feature and the valve becomes unidirectional. 

By-Pass Valves…. 

Dewrance Parallel Slide Gate Valves can be fitted with By- 

Pass Valves when specified by the customer. Dewrance By- 

Pass Valves have a parallel slide gate design with a 

pressure seal bonnet, a forged body, butt-weld ends, can 

be motor operated and are in accordance with MSS-SP-45. 

By-pass, equalizing by-pass, equalizing pipe and drain 

arrangements are available to suit customer design 

installation. Application requests should include the 

following additional information: 

● Unidirectional or bidirectional flow 

● Main valve installation position 

● Piping variations or restriction unique to your design. 

Valve disc 

View through outlet of 

Vee-port Seated Valve 

Valve seat

High pressure 

Steel 

Check Valves 

Sizes 21/2” – 24” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 


51

52 

High Pressure Steel 

Check Valves 

Sizes 21 ⁄2” – 24” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 




● Direct deposited seats hard-faced with Stellite ® or 

Equivalent 

● Tilting Disc design balanced for quick opening and 

immediate closing on flow reversal 

● Lightweight disc with minimum travel 

● Optimum performance underall flow conditions 

● Self-draining geometry 


● Expanded graphite pressure seal design 

● Nitrided hinge pin, supported in nitrided bearings, 

giving a low coefficient of friction and hardwearing 

surface for maximum performance 

● Easy access through pressure seal cover 

● Simplified seat refurbishment, only requires lapping 

● Longer seat life due to non-scuffing action of seat 

to disc geometry 


● Aerodynamic self-aligning tilting disc design for low 

pressure drop characteristic 

● Automatic self closure on flow reversal 

● Inclined seat geometry combined with conical seat 

and disc for tight seal without scuffing 




● Deaerator Recirculation 


● Spray Water Isolation 


● Chemical injection 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Swing Check Design 

Pressure Seal Closure improves as pressure 

increases. 

Hard Faced Stellite ® or equivalent Discs 

and Seats. 

Graphoil ® Pressure Seal Ring. 

Unique location of Disc Hinge eliminates 

external bearings or seals. 

Self aligning Swing Check Disc. 

Tilting Disc Design 

Graphoil ® Pressure Seal Ring. 

Disc supported on Nitrided Bearings. 

Free to rotate on bearings and spindle, 

no keyways used. 

Inclined Seat and aerodynamic Tilting Disc gives 

low pressure drop. 

Pressure Seal Closure improves as pressure 

increases and provides easy access for inline 

maintenance. 

Glandless hinge pin sealing for reliability and 

performance. 

High Pressure Steel 

Check Valves 

1 

2 

7 

10 

6 

7 

8 

Swing Check design 

Tilting Disc design 

3 

4 

5 

9 

53

54 Pressure/Temperature Ratings (Check Valves) 



Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

F67 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

F73 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

A217 

F73 J 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

55 

58 


Prod. Page 

No. No. 

Forged Cast 

A216 

D A105 E 

WCB 

F95 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

56 

59 


Prod. Page 

No. No. 

Forged Cast 

D A105 E 

A216 

WCB 

F95 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

57 

55 

58 

56 

59 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Forged Cast 

A216 

D A105 E 

WCB 

F67 J 

A217 

WC6 

K 

A182 

F22 

L 

A217 

WC9 

57 

ASME Code 

B16.34 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 287.6 282.1 261.3 254.7 246.9 235.1 218.1 208.2 205.4 194.3 162.1 113.0 – – – – – – 

Spec. 291.3 291.3 291.3 291.3 291.3 291.3 280.9 271.0 266.0 242.9 202.4 140.9 – – – – – – 

Std. 291.3 291.3 290.0 280.2 270.1 260.2 241.5 226.6 218.6 206.2 197.8 190.5 178.3 142.1 102.3 71.6 49.6 34.1 

Spec. 291.3 291.3 291.3 291.3 291.3 291.3 291.3 289.7 284.5 282.9 279.9 265.7 237.1 181.2 127.9 89.5 62.0 42.6 

Std. 291.3 291.3 290.3 282.6 274.9 261.1 241.5 226.6 218.6 206.2 197.8 190.5 178.3 156.5 122.1 86.6 59.4 38.9 

Spec. 291.3 291.3 290.9 287.7 281.8 279.9 279.7 277.6 275.1 267.7 261.8 251.6 237.4 201.0 152.5 108.3 74.2 48.5 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 7035 6412 6236 6019 5688 5199 5102 5061 4788 3910 2542 – – – – – – – 

Spec. 7125 7125 7125 7125 7125 6771 6641 6589 5985 4885 3175 – – – – – – – 

Std. 7125 7125 6858 6584 6314 5745 5591 5392 5050 4822 4628 4269 3028 2540 2052 1710 1368 1140 

Spec. 7125 7125 7125 7125 7125 7125 7125 6965 6921 6840 6435 5579 3786 3175 2565 2138 1710 1425 

Std. 7125 7125 6920 6703 6314 5745 5591 5392 5050 4822 4628 4269 3586 3030 2475 2067 1660 1351 

Spec. 7125 7125 7045 6880 6840 6840 6800 6760 6555 6391 6106 5700 4480 3787 3095 2585 2076 1690 

ASME Code 

B16.34 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 2468 2250 2188 2112 1995 1823 1789 1778 1678 1373 894 – – – – – – – 

Spec. 2500 2500 2500 2500 2500 2378 2333 2312 2100 1716 1116 – – – – – – – 

Std. 2500 2500 2406 2311 2217 2017 1961 1894 1773 1694 1623 1499 1062 892 722 600 478 400 

Spec. 2500 2500 2500 2500 2500 2500 2500 2444 2428 2400 2256 1956 1328 1114 900 750 600 500 

Std. 2500 2500 2428 2351 2217 2017 1961 1894 1773 1694 1623 1499 1256 1062 868 725 583 475 

Spec. 2500 2500 2472 2416 2400 2400 2384 2372 2300 2244 2144 2000 1572 1328 1084 906 728 592 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 170.1 166.8 154.6 150.8 146.0 139.0 129.0 123.2 121.6 114.9 95.9 66.9 – – – – – – 

Spec. 172.4 172.4 172.4 172.4 172.4 172.4 166.3 160.5 157.3 143.7 119.9 83.6 – – – – – – 

Std. 172.4 172.4 171.6 165.7 159.9 154.0 142.9 134.1 129.4 122.0 117.1 112.7 105.6 84.1 60.5 42.4 29.3 20.3 

Spec. 172.4 172.4 172.4 172.4 172.4 172.4 172.4 171.4 168.4 167.3 165.6 157.1 140.2 107.2 75.6 53.0 36.7 25.2 

Std. 172.4 172.4 171.8 167.3 162.5 154.5 142.9 134.1 129.4 122.0 117.1 112.7 105.6 92.6 72.1 51.2 35.1 23.0 

Spec. 172.4 172.4 172.1 170.3 166.9 165.7 165.5 164.2 162.8 158.4 155.0 148.9 140.5 119.0 90.2 64.0 43.8 28.6 




-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 4173 3803 3696 3571 3374 3082 3025 3002 2839 2320 1509 – – – – – – – 

Spec. 4225 4225 4225 4225 4225 4016 3938 3909 3549 2896 1882 – – – – – – – 

Std. 4225 4225 4067 3904 3746 3408 3313 3199 2996 2861 2744 2530 1796 1507 1217 1014 811 676 

Spec. 4225 4225 4225 4225 4225 4225 4225 4130 4106 4056 3814 3307 2247 1884 1521 1268 1014 845 

Std. 4225 4225 4102 3977 3746 3408 3313 3199 2996 2861 2744 2530 2124 1797 1469 1227 985 802 

Spec. 4225 4225 4175 4079 4056 4056 4033 4006 3887 3791 3622 3380 2654 2245 1836 1534 1233 1003 




-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 484.8 475.6 440.6 429.6 416.2 396.3 367.9 351.1 346.3 327.7 273.2 190.3 – – – – – – 

Spec. 491.3 491.3 491.3 491.3 491.3 491.3 473.7 457.0 448.5 409.6 341.4 237.8 – – – – – – 

Std. 491.3 491.3 489.0 472.4 455.5 438.7 407.1 382.2 368.5 347.5 333.4 321.2 300.8 239.6 172.4 120.7 83.6 57.5 

Spec. 491.3 491.3 491.3 491.3 491.3 491.3 491.3 488.6 479.8 476.9 471.9 448.2 400.0 305.5 215.6 150.9 104.5 71.9 

Std. 491.3 491.3 489.6 476.8 463.4 440.2 407.1 382.2 368.5 347.5 333.4 321.2 300.8 264.2 205.9 145.9 100.0 65.4 

Spec. 491.3 491.3 490.6 485.5 475.3 472.1 471.6 468.2 464.1 451.5 441.3 424.1 400.3 339.1 257.3 182.5 125.0 81.8 


Forged Steel Swing Disc Check Valve 

Sizes 2 1 ⁄2”– 5” 




Body A105 A182 F22 

Bonnet A516 Gr. 70 A387 Gr. 22 

Cover BS1501-161 G430A A387 Gr. 11 

Hinge Pin AISI 431 (Nitrided) 

Hinge Pin Bush AISI 431 (Nitrided) 

Seat A516 Gr. 70 A387 Gr. 22 

Disc A105 A387 Gr. 22 

Pressure 

Seal Ring 



Dimensions 

* Per ASME B16.10 † 5” valve to have cast steel body Product Numbers 


Size A B C M N Max.Width Weight Cv K Factor A105 F22 

2 1 ⁄2 in 10 2.6 6.18 1.65 2.99 7.32 53lb 

65 mm 254 66 157 42 76 186 24kg 

3 in 12 2.6 7.13 2.17 3.58 7.32 126lb 

80 mm 305 66 181 55 91 186 57kg 

4 in 16 3.15 8.23 2.99 4.61 8.58 165lb 

100 mm 406 80 209 76 117 218 75kg 

† 5 in 19 4.45 10.47 4.25 5.71 9.65 227lb 

† 125 mm 483 113 266 108 145 245 103kg 

Product No. F73 

‘N’ Design 

Material 


Class 

A105 A182-F22 


1690 psi 6350 4650 6350 4650 

bar 438 321 438 321 

A 

M N 

82 0.9888 F73DZ065N F73KZ065N 

145 0.9338 F73DZ080N F73KZ080N 

411 0.8719 F73DZ100N F73KZ100N 

601 0.8093 F73EZ125N F73LZ125N 

C 

B 

55

56 

Forged Steel Swing Disc Check Valve 

Sizes 2 1 ⁄2”– 5” 




Body A105 A182 F22 

Bonnet A516 Gr. 70 A387 Gr. 22 

Cover BS1501-161 G430A A387 Gr. 11 

Hinge Pin AISI 431 (Nitrided) 


Seat A516 Gr. 70 A387 Gr. 22 

Disc A105 A387 Gr. 22 

Pressure 

Seal Ring 



Dimensions 

* Per ASME B16.10 † 5” valve to have cast steel body Product Numbers 


Size A* B C M N Max.Width Weight Cv K Factor A105 F22 

2 1 ⁄2 in 13 2.6 6.18 1.38 2.99 7.32 66lb 

65 mm 330 66 157 35 76 186 30kg 

3 in 14.5 3.15 7.68 1.65 3.58 8.58 150lb 

80 mm 368 80 195 42 91 218 68kg 

4 in 18 3.15 7.76 2.13 4.61 8.58 170lb 

100 mm 457 80 197 54 117 218 77kg 

5† in 21 5.31 11.18 3.46 5.71 12 272lb 

125† mm 533 135 284 88 145 305 123kg 



Material 


Class 

A105 A182-F22 


2850 psi 10700 7900 10700 7900 

bar 737 541 737 541 

A 

M N 

56 1.0277 F95DZ065N F95KZ065N 

82 0.9888 F95DZ080N F95KZ080N 

140 0.9375 F95DZ100N F95KZ100N 

390 0.8453 F95EZ125N F95LZ125N 

C 

B

Cast Steel Tilting Disc Check Valve 

Sizes 6”– 24” 





Bonnet A516 Gr. 70 A387 Gr. 11 A387 Gr. 22 

Cover BS1501-161 G430A A387 Gr. 11 A387 Gr. 11 

Hinge Pin A565-XM32 (Nitrided) 


Hinge Pin Housing AISI 431 (Nitrided) 

Disc A216 Gr. WCB A217 Gr. WC6 A217 Gr. WC9 


Pressure 

Seal Ring 





Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1000 psi 3750 2750 3750 2750 3750 2750 

Dimensions 

bar 259 190 259 190 259 190 

* Per ASME B16.10 † 24” Nominal sizes not shown in ASME B16.10 Product Numbers 

A 

M N 

Carbon Steel Alloy Steel Alloy Steel 

Size A* B C M N Max.Width Weight Cv K Factor WCB WC6 WC9 

6 in 20 3.58 10.02 5.63 6.81 15.67 232lb 

150 mm 508 91 259 143 173 398 105kg 

8 in 26 4.8 12.4 7.44 8.78 17.68 443lb 

200 mm 660 122 315 189 223 449 201kg 

10 in 31 5.98 14.57 9.25 10.94 20.16 722lb 

250 mm 787 152 370 235 278 512 328kg 

12 in 36 7.6 17.13 11.10 12.99 25.16 1180lb 

300 mm 914 193 435 282 330 639 535kg 

14 in 39 7.76 18.23 12.2 14.25 26.69 1652lb 

350 mm 991 197 463 310 362 678 749kg 

16 in 43 9.09 20.98 13.98 16.26 28.03 2137lb 

400 mm 1092 231 533 355 413 712 969kg 

18 in 48 9.61 23.5 15.59 18.31 33 2853lb 

450 mm 1219 244 597 396 465 838 1294kg 

20 in 52 10.43 26.06 17.32 20.31 34.7 3797lb 

500 mm 1321 265 662 440 516 880 1722kg 

24† in 61 13.5 31.1 20.79 24.37 41.6 6367lb 

600† mm 1549 343 790 528 619 1056 2888kg 

831 1.30 F67EZ150N F67JZ150N F67LZ150N 

1492 1.23 F67EZ200N F67JZ200N F67LZ200N 

2365 1.17 F67EZ250N F67JZ250N F67LZ250N 

3481 1.12 F67EZ300N F67JZ300N F67LZ300N 

4263 1.09 F67EZ350N F67JZ350N F67LZ350N 

5676 1.06 F67EZ400N F67JZ400N F67LZ400N 

7126 1.04 F67EZ450N F67JZ450N F67LZ450N 

8881 1.02 F67EZ500N F67JZ500N F67LZ500N 

13055 0.98 F67EZ600N F67JZ600N F67LZ600N 

C 

B 

57

58 


Sizes 6”– 24” 












Pressure 

Seal Ring 





Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


1690 psi 6350 4650 6350 4650 6350 4650 

Dimensions 

bar 438 321 438 321 438 321 




6 in 22 3.74 10.87 5.12 6.81 15.6 379lb 

150 mm 559 95 276 130 173 396 172kg 

8 in 28 4.96 13.35 6.69 8.78 19.5 708lb 

200 mm 711 126 339 170 223 495 321kg 

10 in 34 6.18 16.26 8.35 10.94 22 1184lb 

250 mm 864 157 413 212 278 560 537kg 

12 in 39 7.28 19.64 10.04 12.99 28.8 1969lb 

300 mm 991 185 499 255 330 731 893kg 

14 in 42 7.87 20.83 11.02 14.25 28.43 2099lb 

350 mm 1066 200 529 280 362 722 952kg 

16 in 47 9.1 23.5 12.64 16.26 30.3 3563lb 

400 mm 1194 231 597 321 413 770 1616kg 

18 in 53 10.43 26.06 14.09 18.31 32.8 4125lb 

450 mm 1346 265 662 358 465 833 1871kg 

20 in 58 11.54 28.82 15.63 20.31 36.3 6112lb 

500 mm 1473 293 732 397 516 921 2772kg 

24† in 66 13.86 34.61 18.78 24.37 43.5 9779lb 

600† mm 1676 352 879 477 619 1106 4435kg 

A 

M N 

672 1.36 F73EZ150N F73JZ150N F73LZ150N 

1178 1.29 F73EZ200N F73JZ200N F73LZ200N 

1880 1.23 F73EZ250N F73JZ250N F73LZ250N 

2786 1.17 F73EZ300N F73JZ300N F73LZ300N 

3401 1.14 F73EZ350N F73JZ350N F73LZ350N 

4534 1.11 F73EZ400N F73JZ400N F73LZ400N 

5686 1.09 F73EZ450N F73JZ450N F73LZ450N 

7128 1.05 F73EZ500N F73JZ500N F73LZ500N 

10493 1.01 F73EZ600N F73JZ600N F73LZ600N 

C 

B


Sizes 6”– 24” 












Pressure 

Seal Ring 





Material 


Class 

A-216 WCB A-217 WC6 A-217 WC9 


2850 psi 10700 7900 10700 7900 10700 7900 

Dimensions 

bar 737 541 737 541 737 541 




6 in 24 3.86 10.12 4.17 6.81 17.5 531lb 

150 mm 610 98 257 106 173 445 241kg 

8 in 30 5.04 13.35 5.51 8.78 22.9 975lb 

200 mm 762 128 339 140 223 581 442kg 

10 in 36 6.42 15.83 6.89 10.94 25.7 1693lb 

250 mm 914 163 402 175 278 654 768kg 

12 in 41 7.48 19.53 8.23 12.99 29.1 2796lb 

300 mm 1041 190 496 209 330 740 1268kg 

14 in 44 7.91 20.71 9.06 14.25 31.7 2879lb 

350 mm 1117 201 526 230 362 806 1309kg 

16 in 49 9.41 24.88 10.39 16.26 35.9 4600lb 

400 mm 1245 239 632 264 413 913 2086kg 

18 in 55 10.43 27.64 11.61 18.31 39.9 5886lb 

450 mm 1397 265 702 295 465 1014 2675kg 

20 in 60 11.46 28.94 12.83 20.31 40.8 7664lb 

500 mm 1524 291 735 326 516 1036 3484kg 

24† in 68 13.94 36.85 15.47 24.37 53.2 12663lb 

600† mm 1727 354 936 393 619 1352 5756kg 

A 

M N 

426 1.49 F95EZ150N F95JZ150N F95LZ150N 

767 1.40 F95EZ200N F95JZ200N F95LZ200N 

1226 1.34 F95EZ250N F95JZ250N F95LZ250N 

1790 1.28 F95EZ300N F95JZ300N F95LZ300N 

2195 1.25 F95EZ350N F95JZ350N F95LZ350N 

2934 1.21 F95EZ400N F95JZ400N F95LZ400N 

3695 1.19 F95EZ450N F95JZ450N F95LZ450N 

4570 1.16 F95EZ500N F95JZ500N F95LZ500N 

6823 1.10 F95EZ600N F95JZ600N F95LZ600N 

C 

B 

59

60 

Tilting Disc Check Valve 

Unique Seating Geometry 

Cone in a cone 

Design Features 

1 

2 

3 

4 

Proven cone in a cone seating geometry used on our standard Tilting Disc Check Valve. 

Non scuffing design ensures disc always leaves seat due to position of pivot. 

Pressure intensity high enough to seal. 

Dissimilar seating materials to prevent pick-up. 

Pivot point

Low pressure 

Steel 

Swing Check Valves 

Sizes 2” – 20” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 

Pressure Class: 300, 600 

61

62 

Low Pressure Steel 


Sizes 2” – 20” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 





Equivalent 

● Robust fixing of disc prevents possibility of failure 

(no fixng nut) 

● No external bearings or seals 

● Aluminium reinforced graphic gasket 

Typical Applications: 

● Main Steam Service 

● Boiler Feed Pump Protection 

● L.P. Feed Heaters 




● Steam Turbine Inlet 





1 

2 

3 

4 

5 

6 

The disc holder is supported by a hinge pin 

which is mounted in an integral lug on the 

valve seat, this arrangement eliminates the use 

of external seals or glands. The hinge pin is 

free to move in both components thus 

reducing the possibility of seizure in service. 

The disc is securely attached to the disc holder 

by a locking wire which allows self alignment 

of the disc on the seat, thus ensuring tight shut 

off on reversal of flow. This feature eliminates 

the use of locknuts or split pins, therefore 

preventing possible failure in service. 

Welded in seat ring Stellite ® faced. 

Bolted bonnet with Aluminium reinforced 

Graphoil Gasket. This range of valves 

incorporates, as standard expanded graphite 

joints located in tongue and groove 

configuration between the body and bonnet. 

The bonnet bolts are loaded to pre-determined 

values to ensure a pressure tight seal. 

Self aligning disc Stellite ® faced. 

The Dewrance modular design body 

accomodates a wide range of flanged and 

welded connections. Even unusual size 

requirements can be commonly met without 

difficulty. 

Low Pressure Steel 


1 

2 

3 

4 

5 

6 

63

64 Pressure/Temperature Ratings (Check Valves) 



Prod. Page 

No. No. 

Cast 

F31 

F32 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

65 

66 


Prod. Page 

No. No. 

Cast 

F31 

F32 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

65 

66 


Prod. Page 

No. No. 

Cast 

F51 

F52 

E 

J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

67 

68 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

F51 

E 

J 

A216 

WCB 

A217 

WC6 

A217 

WC9 

67 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 740 675 655 635 600 550 535 535 505 410 270 – – – – – – – 

Spec. 750 750 750 750 750 715 700 695 630 515 335 – – – – – – – 

Std. 750 750 720 695 665 605 590 570 530 510 485 450 320 268 215 180 145 120 

Spec. 750 750 750 750 750 750 750 735 730 720 680 585 400 335 270 225 180 150 

Std. 750 750 730 705 665 605 590 570 530 510 485 450 375 318 260 218 175 143 

Spec. 750 750 740 725 720 720 715 710 690 675 645 600 470 398 325 273 220 178 

ASME Code 

B16.34 


F52 

L 

68 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 51.0 50.0 46.4 45.1 43.9 41.8 38.9 36.9 36.6 34.6 28.7 20.2 – – – – – – 

Spec. 51.7 51.7 51.7 51.7 51.7 51.7 50.0 48.2 47.3 43.1 36.0 25.1 – – – – – – 

Std. 51.7 51.7 51.5 49.6 48.1 46.2 42.9 40.3 38.9 36.5 35.2 33.7 31.7 25.3 18.2 12.7 8.8 6.0 

Spec. 51.7 51.7 51.7 51.7 51.7 51.7 51.7 51.5 50.6 50.3 49.7 47.3 42.0 32.2 22.7 15.9 11.0 7.5 

Std. 51.7 51.7 51.5 50.3 48.7 46.3 42.9 40.3 38.9 36.5 35.2 33.7 31.7 27.7 21.6 15.3 10.5 6.9 

Spec. 51.7 51.7 51.6 51.0 50.1 49.7 49.6 49.2 48.8 47.5 46.6 44.8 42.2 35.6 27.0 19.2 13.2 8.5 

ASME Code 

B16.34 



-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 1480 1350 1315 1270 1200 1095 1075 1065 1010 825 535 – – – – – – – 

Spec. 1500 1500 1500 1500 1500 1425 1400 1390 1260 1030 670 – – – – – – – 

Std. 1500 1500 1445 1385 1330 1210 1175 1135 1065 1015 975 900 640 535 430 360 290 240 

Spec. 1500 1500 1500 1500 1500 1500 1500 1465 1460 1440 1355 1175 795 668 540 450 360 300 

Std. 1500 1500 1455 1410 1330 1210 1175 1135 1065 1015 975 900 755 638 520 435 350 285 

Spec. 1500 1500 1485 1450 1440 1440 1430 1425 1380 1345 1285 1200 945 798 650 543 435 355 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 102.0 100.1 92.8 90.6 87.8 83.6 77.5 74.0 72.9 69.1 57.6 40.1 – – – – – – 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 99.7 96.4 94.6 86.2 72.0 50.2 – – – – – – 

Std. 103.4 103.4 103.0 99.5 95.8 92.4 85.7 80.4 77.6 73.3 70.2 67.7 63.4 50.6 36.3 25.4 17.7 12.0 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 103.4 102.8 101.0 100.6 99.4 94.4 84.2 64.2 45.3 31.8 22.0 15.1 

Std. 103.4 103.4 103.0 100.3 97.5 92.7 85.7 80.4 77.6 73.3 70.2 67.7 63.4 55.7 43.3 30.7 21.1 13.8 

Spec. 103.4 103.4 103.3 102.3 100.2 99.4 99.3 98.5 97.8 95.1 92.9 89.3 84.3 71.5 54.2 38.3 26.2 17.2 


Cast Steel Swing Check Valve 

Sizes 2 1 ⁄2”– 20” 




Body A216 Gr. WCB A217 Gr. WC6 

Cover A516 Gr. 70 A387 Gr. 11 

Seat A516 Gr. 70 A387 Gr. 11 

Gasket Aluminium Reinforced Expanded Graphite 

Disc A516 Gr. 70 A387 Gr. 11 

Hinge Pin AISI 431 AISI 431 

Disc Holder A516 Gr. 70 A387 Gr. 11 


Material 


Class 

A-216 WCB A-217 WC6 


300 psi 1125 825 1125 825 

Dimensions 

bar 78 57 78 57 



‘N’ Design, Butt Weld Ends 

A 

M N 

C 

B 


Size A* B C M N Max. Width Weight Cv K Factor WCB WC6 

2 1 ⁄2 in 9.5 2.06 6.14 2.47 2.88 5.39 35lb 

65 mm 241 52 156 62.7 73.1 137 16kg 

3 in 11.13 2.44 6.3 3.07 3.5 7.28 44lb 

80 mm 283 62 160 78 88.9 185 20kg 

4 in 12 3.19 7.36 4.03 4.5 8.58 77lb 

100 mm 305 81 187 102.3 114.3 218 35kg 

6 in 15.88 4.02 10 6.07 6.63 11.38 159lb 

150 mm 403 102 254 154 168.3 289 72kg 

8 in 16.5 5.20 12.4 7.98 8.63 13.46 280lb 

200 mm 419 132 315 203 219.1 342 127kg 

10 in 18 6.57 15.59 10.02 10.75 16.69 507lb 

250 mm 457 167 396 254 273 424 230kg 

12 in 19.75 7.64 18 11.94 12.75 18.74 736lb 

300 mm 502 194 457 303 323.9 476 334kg 

14 in 30 8.07 19.5 13.12 14 19.96 937lb 

350 mm 762 205 495 333 355.6 507 425kg 

16 in 33 8.78 21.61 15 16 22 1281lb 

400 mm 838 223 549 381 406.4 559 581kg 

18 in 36 9.96 24.37 16.88 18 23.94 1768lb 

450 mm 914 253 619 429 457.2 608 802kg 

20 in 39 10.98 26.18 18.81 20 26.34 2492lb 

500 mm 991 279 665 478 508 669 1130kg 

198 0.85 F31EZ065N F31JZ065N 

306 0.85 F31EZ080N F31JZ080N 

543 0.80 F31EZ100N F31JZ100N 

1272 0.75 F31EZ150N F31JZ150N 

2276 0.70 F31EZ200N F31JZ200N 

3772 0.68 F31EZ250N F31JZ250N 

5247 0.66 F31EZ300N F31JZ300N 

6434 0.64 F31EZ350N F31JZ350N 

8476 0.63 F31EZ400N F31JZ400N 

10908 0.61 F31EZ450N F31JZ450N 

13658 0.60 F31EZ500N F31JZ500N 

65

66 


Sizes 2 1 ⁄2”– 20” 





Cover A516 Gr. 70 A387 Gr. 11 

Seat A516 Gr.70 A387 Gr. 11 


Disc A516 Gr. 70 A387 Gr. 11 




Material 


Class 

A-216 WCB A-217 WC6 


300 psi 1125 825 1125 825 

Dimensions 

bar 78 57 78 57 



‘N’ Design, Flanged 

A 

N 

C 


Size A* C N Weight Cv K Factor WCB WC6 

2 1 ⁄2 in 9.5 6.14 7.5 53lb 

65 mm 241 156 191 24kg 

3 in 11.13 6.3 8.25 70lb 

80 mm 283 160 210 32kg 

4 in 12 7.36 10 121lb 

100 mm 305 187 254 56kg 

6 in 15.88 10 12.5 224lb 

150 mm 403 254 318 102kg 

8 in 16.5 12.4 15 389lb 

200 mm 419 315 381 177kg 

10 in 29.25 15.59 17.5 669lb 

250 mm 743 396 445 304kg 

12 in 31.25 18 20.5 957lb 

300 mm 794 457 521 434kg 

14 in 30 19.5 23 1243lb 

350 mm 762 495 584 565kg 

16 in 33 21.61 25.5 1674lb 

400 mm 838 549 648 761kg 

18 in 36 24.37 28 2260lb 

450 mm 914 619 711 1027kg 

20 in 39 26.18 30.5 3071lb 

500 mm 991 665 775 1396kg 

198 0.85 F32EZ065N F32JZ065N 

306 0.85 F32EZ080N F32JZ080N 

543 0.80 F32EZ100N F32JZ100N 

1272 0.75 F32EZ150N F32JZ150N 

2276 0.70 F32EZ200N F32JZ200N 

3772 0.68 F32EZ250N F32JZ250N 

5247 0.66 F32EZ300N F32JZ300N 

6434 0.64 F32EZ350N F32JZ350N 

8476 0.63 F32EZ400N F32JZ400N 

10908 0.61 F32EZ450N F32JZ450N 

13658 0.60 F32EZ500N F32JZ500N


Sizes 2 1 ⁄2”– 20” 





Cover A516 Gr. 70 A387 Gr. 11 

Seat A516 Gr. 70 A387 Gr. 11 


Disc A516 Gr. 70 A387 Gr. 11 




Material 


Class 

A-216 WCB A-217 WC6 


600 psi 2250 1650 2250 1650 

Dimensions 

bar 156 114 156 114 



‘N’ Design, Butt Weld Ends 


Size A* B C M N Max. Width Weight Cv K Factor WCB WC6 

2 1 ⁄2 in 13 2.05 6.5 2.32 2.88 5.79 40lb 

65 mm 330 52 165 58.9 73.1 147 18kg 

3 in 14 2.44 7 2.9 3.5 7.68 48lb 

80 mm 356 62 178 73.7 88.9 195 22kg 

4 in 17 3.22 7.64 3.83 4.5 9.21 97lb 

100 mm 432 82 194 97.3 114.3 234 44kg 

6 in 22 4.09 10.59 5.76 6.63 11.69 198lb 

150 mm 559 104 269 146 168.3 297 90kg 

8 in 26 5.35 13.39 7.63 8.63 14.21 359lb 

200 mm 660 136 340 194 219.1 361 163kg 

10 in 31 6.58 16.22 9.56 10.75 16.69 585lb 

250 mm 787 167 412 243 273 424 266kg 

12 in 33 7.63 19.02 11.38 12.75 18.5 891lb 

300 mm 838 194 483 289 323.9 470 405kg 

14 in 35 8.46 20.7 12.5 14 20.71 1100lb 

350 mm 889 215 526 318 355.6 526 499kg 

16 in 39 9.25 23.07 14.31 16 22.68 1442lb 

400 mm 991 235 586 363 406.4 576 654kg 

18 in 43 10.31 25.63 16.13 18 25 1969lb 

450 mm 1092 262 651 410 457.2 635 893kg 

20 in 47 11.38 28 17.94 20 28.19 2718lb 

500 mm 1194 289 711 456 508 716 1233kg 

A 

M N 

175 0.85 F51EZ065N F51JZ065N 

273 0.85 F51EZ080N F51JZ080N 

490 0.80 F51EZ100N F51JZ100N 

1146 0.75 F51EZ150N F51JZ150N 

2081 0.70 F51EZ200N F51JZ200N 

3314 0.68 F51EZ250N F51JZ250N 

4766 0.66 F51EZ300N F51JZ300N 

5840 0.64 F51EZ350N F51JZ350N 

7714 0.63 F51EZ400N F51JZ400N 

9960 0.61 F51EZ450N F51JZ450N 

12423 0.60 F51EZ500N F51JZ500N 

C 

B 

67

68 


Sizes 2 1 ⁄2”– 20” 





Cover A516 Gr. 70 A387 Gr. 11 

Seat A516 Gr. 70 A387 Gr. 11 


Disc A516 Gr. 70 A387 Gr. 11 




Material 


Class 

A-216 WCB A-217 WC6 


600 psi 2250 1650 2250 1650 

Dimensions 

bar 156 114 156 114 



‘N’ Design, Flanged 


Size A* C N Weight Cv K Factor WCB WC6 

2 1 ⁄2 in 13 6.5 7.5 57lb 

65 mm 330 165 191 26kg 

3 in 14 7 8.25 81lb 

80 mm 356 178 210 37kg 

4 in 17 7.64 10.75 128lb 

100 mm 432 194 273 58kg 

6 in 22 10.59 14 334lb 

150 mm 559 269 356 152kg 

8 in 26 13.39 16.5 568lb 

200 mm 660 340 419 258kg 

10 in 31 16.22 20.0 920lb 

250 mm 787 412 508 418kg 

12 in 33 19.02 22 1263lb 

300 mm 838 483 559 574kg 

14 in 35 20.7 23.75 1441lb 

350 mm 889 526 603 655kg 

16 in 39 23.07 27 2053lb 

400 mm 991 586 685 933kg 

18 in 43 25.63 29.25 2746lb 

450 mm 1092 651 743 1248kg 

20 in 47 28 32 3687kg 

500 mm 1194 711 813 1676lb 

A 

175 0.85 F52EZ065N F52JZ065N 

273 0.85 F52EZ080N F52JZ080N 

490 0.80 F52EZ100N F52JZ100N 

1146 0.75 F52EZ150N F52JZ150N 

2081 0.70 F52EZ200N F52JZ200N 

3314 0.68 F52EZ250N F52JZ250N 

4766 0.66 F52EZ300N F52JZ300N 

5840 0.64 F52EZ350N F52JZ350N 

7714 0.63 F52EZ400N F52JZ400N 

9960 0.61 F52EZ450N F52JZ450N 

12423 0.60 F52EZ500N F52JZ500N 

N 

C

Bled 

Steam 

Check Valve 

Sizes 6” – 28” 

ASME B16.34 – 1996 


69

70 

Bled Steam Check Valve 

Introduction 

This range of valves has been specifically designed for 

installation in bled (extraction) steam lines between 

steam turbines and feed water heaters but are equally 

applicable to reheater connections and bleed on passout 

lines in process plants. 

Their function is to prevent the reverse flow of stored 

steam and any water from the heater or its bled steam 

pipe to the turbine. Installation would be in a horizontal 

pipe as near to the turbine as possible. 

These valves are Free Acting whereby the disc moves to 

the closed position when flow in the forward direction 

ceases. Gravity action on the disc provides a closing 

moment from the fully open to fully closed position. 

Where power assistance is required a Spring return 

pneumatic cylinder can easily be accommodated whilst 

still maintaining the automatic Gravity closing feature. 

The Dewrance bled steam Check Valve is the result of 

evolution from the original vertical seated design, field 

experience, customers requirements and is based on the 

Dewrance Tilting Disc Check Valve. 

All Dewrance Tilting Disc Check valves are based on the 

same seat geometry of a conical seated disc in a conical 

body seat, which has been applied over a wide range of 

conditions from sub-atmospheric bled steam up to ANSI 

2500 Class for steam and water. The seating intensity is 

high enough to give a good seal and yet low enough 

not to cause any surface scuffing. The position of the 

hinge pin ensures that the disc opens and closes without 

a rubbing action to effect a tight seal over the full range 

of pressures. 

The combination of disc geometry and the body shape 

produce a seat angle which gives a short disc travel as 

the flow falls progressively with decreasing flow. This 

disc will be on the seat when flow ceases and before 

reversal takes place without SLAMMING. This 

arrangement gives a low pressure drop and flow under 

the disc assists in keeping the valve fully open over a 

wide range of flows.

Product Application Tests 

Flow Tests 

Extensive flow tests have been carried out to establish 

flow characteristics for these valves. 

The tests consisted of:- 

1 A scale model (230mm) tested with air to establish 

the aerodynamic torque on the disc and the flow 

coefficient at various angles of opening. 

The lowest pressure drop occurs when the disc is in 

the fully open position. 

2. A full size 400mm valve tested in Steam flows up to 

300ft/sec (92 Metres/Sec) to confirm the disc opening 

angle and establish the body and disc design shape. 

These tests confirmed that the Dewrance design is 

stable under the flow conditions and achieves the 

fully open position at minimum flow, thus giving low 

pressure drop. (Details of flow coefficients are 

available on request). 

Pneumatic actuator functional test simulating increasing load over the full load. 

Actual scale model under air test in GEC Aerodynamic Laboratory. 

Actuator Tests 

Power closing actuators designed for on-load testing are 

tested on a specially designed rig which simulates the 

increasing load as the valve closure occurs. The load is 

critically associated with the stroking time and this too is 

accurately checked. 

Closing time and the pressure against which it must 

close the valve must be specified by the feed heating 

plant designer. Each actuator is specially designed for its 

particular application. 

Functional Tests 

Every Dewrance valve is hydrostatically tested to prove 

the shell and ensure the seat is leak tight prior to 

leaving the factory. 

Gravity closing times are checked in still air to ensure 

the valve closes in one second or less. 

Where pneumatic actuators are fitted the complete 

valve is stroked in free air in addition to the Actuator 

tests described above. 

71

72 

Bled Steam Check Valve Bled Steam Check Valve 

73 

Sizes 6” – 28” 

ASME B16.34 – 1996 




● Internal Counterweight to balance disc under low 

load conditions 

● Direct deposited seats 

● Tilting disc design for quick closing due to lower 

centre of gravity 

● Lightweight disc with minimum travel, for quick 

closing in less than 1 second 

● Optimum performance under all flow conditions 

● Self-draining geometry 

● Pneuamtic Power Assistance acts directly onto disc, 

without leakages to inhibit operation 


● Expanded graphite gasket pressure seal design 

● Nitrided hinge pin, supported in nitrided bearings, 

giving a low coefficient of friction and hard wearing 

surface for maximum performance 

● Easy access through cover 

● Simplified seat refurbishment, only requires lapping 

● Longer seat life due to non-scuffing action of seat to 

disc geometry 


● Aerodynamic self aligning tilting disc design for low 

pressure drop characteristics 

● Automatic self closure on flow reversal 

● Inclined seat geometry combined with conical seat & 

disc for tight seal without scuffing 

● No hinge pin gland to inhibit performance 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

Graphoil Gasket/Pressure Seal bonnet 

(dependant on) Size/Pressure 

Disc supported in Nitrided Bearings 

Inclined seat and aerodynamic Tilting disc gives 

low pressure drop, and minimum disc travel 

Variable seat/disc to suit actual condition for 

optimum flow characteristics 

Hard faced Stellite ® or equivalent disc 

Internal counterweight if required to ensure 

maximum opening position under low flow 

conditions 

No External Glands or keyway to inhibit 

operation 

Positive open position stop and Aerodynamic 

disc provides stability over wide range of flow 

(no flutter) 

Direct Mounted Quick Closing Pneumatic 

Actuator to assist closure, act directly onto disc 

Unique seat geometry and seating materials 

prevent scuffing and ensure leak tight seals 

Free swinging Tilting Disc design, no linkages, 

keys or pins to inhibit operation 

11 

7 

2 

1 

6 

5 

10 

9 

8 

4 

3

74 

Pressure/Temperature Ratings 



Prod. Page 

No. No. 

Cast 

E 

B21 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

75 


Prod. Page 

No. No. 

Cast 

E 

B21 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

75 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

E 

B43 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

76 



-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 285 260 230 200 170 140 125 110 95 80 65 – – – – – – – 

Spec. 290 290 290 290 290 275 270 265 240 200 130 – – – – – – – 

Std. 290 260 230 200 170 140 125 110 95 80 65 50 35 28 20 20 20 20 

Spec. 290 290 290 290 290 290 290 280 280 275 260 225 155 130 105 88 70 58 

Std. 290 260 230 200 170 140 125 110 95 80 65 50 35 28 20 20 20 20 

Spec. 290 290 285 280 275 275 275 275 265 260 245 230 180 153 125 105 85 70 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

E 

B43 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

76 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 19.6 19.3 17.7 15.8 14.0 12.1 10.2 8.4 7.4 6.5 5.6 4.6 – – – – – – 

Spec. 20.0 20.0 20.0 20.0 20.0 20.0 19.3 18.5 18.0 16.4 14.0 9.7 – – – – – – 

Std. 20.0 19.5 17.7 15.8 14.0 12.1 10.2 8.4 7.4 6.5 5.6 4.6 3.7 2.8 1.9 1.4 1.4 1.4 

Spec. 20.0 20.0 20.0 20.0 20.0 20.0 20.0 19.8 19.3 19.3 19.0 18.1 16.1 12.4 8.8 6.2 4.2 2.9 

Std. 20.0 19.5 17.7 15.8 14.0 12.1 10.2 8.4 7.4 6.5 5.6 4.6 3.7 2.8 1.9 1.4 1.4 1.4 

Spec. 20.0 20.0 20.0 19.6 19.3 19.0 19.0 19.0 18.9 18.3 17.9 17.1 16.1 13.7 10.4 7.4 5.2 3.5 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

E 

B51 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

77 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 990 900 875 845 800 730 715 710 670 550 355 – – – – – – – 

Spec. 1000 1000 1000 1000 1000 950 935 925 840 685 445 – – – – – – – 

Std. 1000 1000 965 925 885 805 785 755 710 675 650 600 425 358 290 240 190 160 

Spec. 1000 1000 1000 1000 1000 1000 1000 980 970 960 905 785 530 445 360 300 240 200 

Std. 1000 1000 970 940 885 805 785 755 710 675 650 600 505 425 345 290 235 190 

Spec. 1000 1000 990 965 960 960 955 955 920 895 855 800 630 533 435 363 290 238 

ASME Code 

B16.34 



-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 68.2 66.9 61.8 60.3 58.4 55.7 51.7 49.2 48.6 45.9 38.4 26.6 – – – – – – 

Spec. 68.9 68.9 68.9 68.9 68.9 68.9 66.5 64.3 63.0 57.5 47.9 33.3 – – – – – – 

Std. 68.9 68.9 68.7 66.5 64 61.5 57 53.6 51.6 48.9 46.7 45.1 42.3 33.6 24.3 17 11.7 8.1 

Spec. 68.9 68.9 68.9 68.9 68.9 68.9 68.9 68.6 67.5 66.9 66.2 63 56.3 42.9 30.2 21.2 14.7 10.1 

Std. 68.9 68.9 68.7 66.8 65 61.7 57 53.6 51.6 48.9 46.7 45.1 42.3 37.2 28.9 20.4 14.1 9.1 

Spec. 68.9 68.9 68.9 68.2 66.7 66.3 66.2 65.8 65.5 63.4 61.8 59.4 56.1 47.7 36.2 25.6 17.5 11.6 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Cast 

E 

B51 J 

L 

A216 

WCB 

A217 

WC6 

A217 

WC9 

77 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 1480 1350 1315 1270 1200 1095 1075 1065 1010 825 535 – – – – – – – 

Spec. 1500 1500 1500 1500 1500 1425 1400 1390 1260 1030 670 – – – – – – – 

Std. 1500 1500 1445 1385 1330 1210 1175 1135 1065 1015 975 900 640 535 430 360 290 240 

Spec. 1500 1500 1500 1500 1500 1500 1500 1465 1460 1440 1355 1175 795 668 540 450 360 300 

Std. 1500 1500 1455 1410 1330 1210 1175 1135 1065 1015 975 900 755 638 520 435 350 285 

Spec. 1500 1500 1485 1450 1440 1440 1430 1425 1380 1345 1285 1200 945 798 650 543 435 355 

ASME Code 

B16.34 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 102.0 100.1 92.8 90.6 87.8 83.6 77.5 74.0 72.9 69.1 57.6 40.1 – – – – – – 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 99.7 96.4 94.6 86.2 72.0 50.2 – – – – – – 

Std. 103.4 103.4 103.0 99.5 95.8 92.4 85.7 80.4 77.6 73.3 70.2 67.7 63.4 50.6 36.3 25.4 17.7 12.0 

Spec. 103.4 103.4 103.4 103.4 103.4 103.4 103.4 102.8 101.0 100.6 99.4 94.4 84.2 64.2 45.3 31.8 22.0 15.1 

Std. 103.4 103.4 103.0 100.3 97.5 92.7 85.7 80.4 77.6 73.3 70.2 67.7 63.4 55.7 43.3 30.7 21.1 13.8 

Spec. 103.4 103.4 103.3 102.3 100.2 99.4 99.3 98.5 97.8 95.1 92.9 89.3 84.3 71.5 54.2 38.3 26.2 17.2


Sizes 8”– 28” 





Cover A216 Gr. WCB A217 Gr. WC9 


Disc A216 Gr. WCB A217 Gr. WC9 

Hinge Pin ASTM A565 XM32 


Dimensions 

Product No. B21 

Material 


Class 

A-216 WCB A-217 WC9 


150 psi 450 325 450 325 

bar 30 22 30 22 

A 

M N 


C 


Size A C M N Weight WCB WC9 

8 in 23 47 8.07 8.63 695lb 

200 mm 584 1195 205 219.1 315kg 

10 in 28 48.82 10.13 10.75 864lb 

250 mm 711 1240 257.4 273 392kg 

12 in 31 52 12.09 12.75 1184lb 

300 mm 787 1320 307 323.8 537kg 

14 in 33 53.15 13.25 14 1730lb 

350 mm 838 1350 336.6 355.6 785kg 

16 in 37 54.33 15.25 16 1845lb 

400 mm 940 1380 387.4 406.4 837kg 

18 in 42.52 63 17.13 18 2612lb 

450 mm 1080 1600 435 457.2 1185kg 

20 in 47 65.75 19 20.00 2742lb 

500 mm 1194 1670 482.6 508 1244kg 

22 in 50 68.11 21.06 22 3670lb 

550 mm 1270 1730 535 558.8 1665kg 

24 in 54.72 72.05 22.87 24 4608lb 

600 mm 1390 1830 581 609.6 2090kg 

28 in 61 76.77 26.81 28 5688lb 

700 mm 1550 1950 681 711.2 2580kg 

Sizes greater than 700mm are available on application. 

B21EN200- B21LN200- 

B21EN250- B21LN250- 

B21EN300- B21LN300- 

B21EN350- B21LN350- 

B21EN400- B21LN400- 

B21EN450- B21LN450- 

B21EN500- B21LN500- 

B21EN550- B21LN550- 

B21EN600- B21LN600- 

B21EN700- B21LN700- 

75

76 


Sizes 6”– 24” 










Dimensions 


Material 


Class 

A-216 WCB A-217 WC9 


400 psi 1500 1100 1500 1100 

bar 104 76 104 76 

A 

M N 


C 



6 in 20 34.09 5.76 6.63 540lb 

150 mm 508 866 146.3 168.3 245kg 

8 in 26 49.21 7.63 8.63 926lb 

200 mm 660 1250 193.7 219.1 420kg 

10 in 31 51.18 9.56 10.75 1118lb 

250 mm 787 1300 242.8 273 507kg 

12 in 35.43 54.33 11.38 12.75 1433lb 

300 mm 900 1380 289 323.8 650kg 

14 in 37 58.07 12.50 14 2524lb 

350 mm 940 1475 317.6 355.6 1145kg 

16 in 41 59.45 14.31 16 3097lb 

400 mm 1041 1510 363.6 406.4 1405kg 

18 in 46 61.02 16.13 18 3659lb 

450 mm 1169 1550 409.6 457.2 1660kg 

20 in 51 63.78 17.94 20 3828lb 

500 mm 1295 1620 455.6 508 1737kg 

22 in 56 73.23 19.76 22 4595lb 

550 mm 1422 1860 502 558.8 2085kg 

24 in 60 77.95 21.57 24 5371lb 

600 mm 1524 1980 547.8 609.6 2437kg 


B43EN150- B43LN150- 

B43EN200- B43LN200- 

B43EN250- B43LN250- 

B43EN300- B43LN300- 

B43EN350- B43LN350- 

B43EN400- B43LN400- 

B43EN450- B43LN450- 

B43EN500- B43LN500- 

B43EN550- B43LN550- 

B43EN600- B43LN600-


Sizes 6”– 10” 










Dimensions 


Material 


Class 

A-216 WCB A-217 WC9 


600 psi 2250 1650 2250 1650 

bar 156 114 156 114 

A 




6 in 20 36.22 5.76 6.63 760lb 

150 mm 508 920 146.3 168.3 345kg 

8 in 26 49.61 7.63 8.63 1058lb 

200 mm 660 1260 193.7 219.1 480kg 

10 in 33 53.15 9.56 10.75 1355lb 

250 mm 838 1350 242.8 273 616kg 


M N 

C 

B51EN150- B51LN150- 

B51EN200- B51LN200- 

B51EN250- B51LN250- 

77

78 


Unique Seating Geometry 

Cone in a cone 

Design Features 

1 

2 

3 

4 

Proven cone in a cone seating geometry used on our standard Bled Steam Check Valve. 

Non scuffing design ensures disc always leaves seat due to position of pivot. 

Pressure intensity high enough to seal. 

Dissimilar seating materials to prevent pick-up. 

Pivot point

Simple design for maximum reliability 

in operation 

The disc is free to rotate on the hinge pin and the hinge 

pin is free to rotate on its bearings, thus ensuring 

freedom of movement and maximum reliability without 

the use of glands. 

Nitride treated hinge pin and bearings give hard 

wearing surfaces with a low coefficient of friction. 

Butt weld ends 

are standard 

(Flanged ends 

as an option) 

No 

spindle 

glands 

Flow under disc assists 

in opening and keeps 

valve open over wider 

range of loads. 

Robust cast steel body to resist thrusts and 

moments from pipework. 

Reduces any tendency for valve to ‘stick’. 

Easy access 

to disc 

Deposits on sealing surfaces are of different hardness 

and analysis to prevent ‘scuffing’. 

In the full open position the valves offer a maximum 

flow area as will be seen from the illustrations. Standard 

designs close in less than one second, this time being 

determined by a test in still air. 

Minimum 

disc 

travel 

Standard bolted cover 

with graphite gasket 

Disc 

Body 

Pressure seal 

bonnet on 

large reheat 

steam valves 

79

80 Bled Steam Check Valve – Options 

Power Closing 

Where power assistance or ‘power closing’ is required an 

Air to open and Spring or Spring + air to close 

Pneumatic cylinder can easily be accommodated whilst 

still maintaining the Automatic Gravity Closing feature. 

Power assisted valves can close in less than half a second 

but is dependent on size and pressure. 

Typical Schematic and Wiring Diagram 

This is a basic diagram, however, other arrangements can be 

supplied to suit specific requirements. 

Typical Wiring Diagram 

Supply 

Typical Schematic Diagram 

Air 

supply 

Turbine 

trip 

High water 

level 

Closed 

limit switch 

Test 

P.B. 

Turbine 

trip 

Filter/Regulator 

Turbine 

Solenoid 

Closed 

indicator lamp 

Solenoid 

operated 

control 

valve 

Quick 

Exhaust 

Valve 

High water 

level 

Heater

Feed Water 

Heater Isolation 

System 

Sizes 6” – 20” 

ASME B16.34 – 1996 

Pressure Class: 1690, 1715 int. 

81

82 


Isolation System 

These valves are designed to bypass high pressure 

feedwater around a group of heaters in the event of 

high water level in the shell caused by a defective tube, 

weld or drain system. The time available to give 

protection to a turbine in modern feed systems is short 

but these valves can operate in approximately 5 seconds 

in a 300mm bore pipe system with the minimum of 

hydraulic shock. Protection is achieved in the system by 

installing fast closing tee and changeover valves in the 

pipework around a heater or group of heaters. These 

valves are equally applicable in new or established 

stations. The motive power employed is the feedwater 

pressure and the system is designed to ‘fail safe’ in that 

the heaters will be by-passed if either electric or 

pneumatic supplies fail. 

As an alternative to the medium operated valves, a 

spring loaded bypass valve can be supplied. This is the 

simplest form of bypass which relieves at a set pressure 

and is fail safe. 

The Dewrance design has the advantages of a pressure 

seal bonnet and external spring adjustment whilst the 

valve is still under pressure. 

These valves can also be supplied with 

a direct mounted electric actuator. 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

Fabricated steel handwheel. 

Split stem (with separate coupling) to allow 

hand operation for commissioning and 

maintenance without having any effect on 

normal operation. 

Position indication. 

Expanded graphite packing. 

Forged steel bonnet 

(A.S.T.M. A105-Carbon limit 0.25%). 

Dewrance, Patented profiled stem arrangement 

to damp movement and prevent disc slamming 

onto seat when quick closing. 

Exhaust from cylinder to quick acting valve. 

Neck bush for adequate stem support. 

Upper valve seat*, hard faced (Stellite or 

equivalent) removable for maintenance. 

Valve disc. self aligning, double seated* and 

hard faced (Stellite or equivalent). 

Lower valve seat, hard faced 

(Stellite or equivalent). 

Butt weld ends. 

Pressure seal bonnet. 

Piston fitted with Piston rings. 

Stainless steel cylinder liner. 

Orifice to control flow into bottom of cylinder. 

Lower seat ring welded. 

Cast steel body (WCB) standard 

forged/fabricated body available in same sizes 

as an option. 

*Applies to two way changeover valve only. 



1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

Detail of Damping Device 

13 

14 

15 

16 

17 

18 

83

84 

Feed Water Heater Isolation System 

Operation 

This system is designed to be “FAIL SAFE”. Failure of the 

controlling electric or pneumatic supplies will cause the 

main changeover and outlet valves to close and so 

isolate the feed side of the feed heater or heater bank. 

Float switches on feed water heaters are intended to 

have contacts normally made and to break with rising 

water level. Relays and solenoid are normally energised 

and are to be continuously rated. 

Assuming the unit to be in normal operation the 

changeover valve will be in the position shown i.e. with 

the bypass line isolated. The out of balance forces acting 

on the disc caused by a combination of the differential 

area between the bottom and top of the disc and the 

pressure drop across the heater bank, will hold it in this 

position. 

The solenoids on the Quick Acting Valve will be normally 

energised allowing air pressure on the top of the 

diaphragm to keep the valve closed. 

Rising water level in a heater will cause the float switch 

contacts to break, de-energising the solenoids on the 

Quick Acting Valve causing it to open. 

When the Quick Acting Valve opens, water is exhausted 

from the lower chamber (A) of the operating cylinder of 

both the Changeover valve and the 2-way outlet valve 

at a far greater rate than it can enter through the small 

filling orifice (Refer to (16) on previous page). 

Typical Feed Water Heater 


From 

BFP 

Regulating 

Valve 

Priming 

Valves 

B 

A 

Control 

Panel 

Dump Valve 

Feed Water passes through the adjustable orifice into 

chamber (B) and the resulting pressure difference on the 

pistons causes both valves to isolate the heater or heater 

bank. 

Control of the speed of operation, to reduce the effects 

of hydraulic shock, is by means of the adjustable orifice 

over the major part of the stroke and finally by the 

patented specially profiled stem and port arrangement 

which prevents any tendency for the disc to slam onto 

the seat. 

During the above closing process, the electrically 

operated Dump Valve has also opened allowing the 

safety relief valve to operate and reduce the pressure in 

the heater and feed piping to ensure that both valves 

are held firmly closed under alI conditions. 

Any increase in pressure from whatever source in the 

isolated section of feed water piping between the two 

main valves, will be automatically reduced by the safety 

relief valve. 

At the point of main valve closure the Quick Acting 

Valves will also close to prevent unnecessary loss of feed 

water to drain. 

Dewrance medium operated valves are available in a 

wide variety of sizes and pressure classes and can be 

supplied together with the ancillary equipment to suit 

individual customers requirements. 

High 

Level 

Water 

Switch 

Quick Acting 

Valve (DAV) 

Regulating 

Valve B 

Bypass 

A 

To Boiler 

Feed Water 

Heater

Feed Water Heater Isolation System 

Typical System 

Single Bank Isolation 

Upper 

Connection 

to operating 

cylinder 

Connection for 

operating fluid to 

Upper Connection 

Adjustable 

Orifice for 

Speed Control 

Priming Valves 

2 Way Fast 

Changeover 

Valve 

B 

A 

Quick 

Acting 

Valve 

Drain 

Dump Valve 

Relief Valve 


High 

Water 

Level 

Switch 

A 

B 

Electrical Connection 

Bypass 

Main Feed 

Adjustable 

Orifice 

2 Way Outlet Valve 

85

86 




Prod. Page 

No. No. 

Forged Cast 

87 

W8A 

Y8A 

D A105 E 

A216 

WCB 

88 

89 


Prod. Page 

No. No. 

Forged Cast 

87 

W8A 

Y8A 

D A105 E 

A216 

WCB 

88 

89 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 4235 3859 3751 3624 3424 3127 3070 3047 2881 2355 1531 – – – – – – – 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Forged Cast 

A73 D A105 E 

A216 

WCB 

90 

Spec. 4288 4288 4288 4288 4288 4076 3996 3967 3602 2939 1910 – – – – – – – 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 291.9 286.3 265.2 258.4 250.5 238.6 221.3 211.3 208.5 197.2 164.5 114.7 – – – – – – 

ASME Code 

B16.34 



Prod. Page 

No. No. 

Forged Cast 

Spec. 295.6 295.6 295.6 295.6 295.6 295.6 285.1 275.0 270.0 246.5 205.4 143.0 – – – – – – 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 4173 3803 3696 3571 3374 3082 3025 3002 2839 2320 1509 - - - - - - - 

ASME Code 

B16.34 


A73 D A105 E 

A216 

WCB 

90 

Spec. 4225 4225 4225 4225 4225 4016 3938 3909 3549 2896 1882 - - - - - - - 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 287.6 282.1 261.3 254.7 246.9 235.1 218.1 208.2 205.4 194.3 162.1 113.0 – – – – – – 

ASME Code 

B16.34 

Spec. 291.3 291.3 291.3 291.3 291.3 291.3 280.9 271.0 266.0 247.9 202.4 140.9 – – – – – – 


Other pressure classes (up to 2500 class) available on request. 

Specially modified top gear on size 10” 1690 Class valves supplied to 

Hyundai Engineering Co. Ltd, for Makkah Taif Power Station in Saudi Arabia.

Feed Water Heater Isolation Valve 

Sizes 6”– 20” 

ASME B16.34 1715 Int. Class 


Body ASTM A216 WCB (0.25% C max) 

Pressure Seal Expanded Graphite 

Bonnet ASTM A105 

Valve Head ASTM A105 H/F Stellite or Equivalent 

Seat ASTM A105 H/F Stellite or Equivqlent 


Press. 

Body Material 

ASTM 

Class 

A-216 WCB 

Dimensions 

Shell Seat 

1715 psi 6450 4725 

bar 444 326 

Outlet, Angle Pattern 

Medium Operated Valve 

C 

B 

øK 

A 

øM øN 

Size A B C K M N Product Numbers 

6 in 12.40 12.40 33 18 5.12 6.81 

150 mm 315 315 838 457 130 173 

8 in 12.80 12.80 42 18 6.69 8.78 

200 mm 325 325 1067 457 170 223 

10 in 17 17 46 24 8.35 10.94 

250 mm 432 432 1169 610 212 278 

12 in 20.67 20.67 51 36 9.06 12.95 

300 mm 525 525 1295 914 230 329 

14 in 21.65 21.65 55 36 11.02 14.25 

350 mm 550 550 1397 914 280 362 

16 in 24.76 24.76 57 36 12.64 16.26 

400 mm 629 629 1448 914 321 413 

18 in 27.63 27.63 60 36 14.09 18.31 

450 mm 702 702 1524 914 358 465 

20 in 28.98 28.98 63 36 15.63 20.31 

500 mm 736 736 1600 914 397 516 

W8AE150P 

W8AE200P 

W8AE250P 

W8AE300P 

W8AE350P 

W8AE400P 

W8AE450P 

W8AE500P 

87

88 


Sizes 6”– 20” 









Press. 

Body Material 

ASTM 

Class 

A-216 WCB 

Dimensions 

Shell Seat 

1715 psi 6450 4725 

bar 444 326 

Two Way Outlet, Tee Pattern 

Medium Operated Valve 

C 

B 

øK 

A A 

øM øN 

Size A B C K M N Product Numbers 

6 in 12.40 12.40 33 18 5.12 6.81 

150 mm 315 315 838 457 130 173 

8 in 12.80 12.80 42 18 6.69 8.78 

200 mm 325 325 1067 457 170 223 

10 in 17 17 47 18 8.35 10.94 

250 mm 432 432 1194 457 212 278 

12 in 20.67 20.67 51 36 10.04 12.99 

300 mm 525 525 1295 914 255 330 

14 in 21.65 21.65 55 36 11.02 14.25 

350 mm 550 550 1397 914 280 362 

16 in 24.76 24.76 57 36 12.64 16.26 

400 mm 629 629 1448 914 321 413 

18 in 27.64 27.64 60 36 14.09 18.31 

450 mm 702 702 1524 914 358 465 

20 in 28.98 28.98 63 36 15.63 20.31 

500 mm 736 736 1600 914 397 516 

W8AE150P 

W8AE200P 

W8AE250P 

W8AE300P 

W8AE350P 

W8AE400P 

W8AE450P 

W8AE500P


Sizes 6”– 20” 









Press. 

Body Material 

ASTM 

Class 

A-216 WCB 

Dimensions 

Shell Seat 

1715 psi 6450 4725 

bar 444 326 

Size A B B1 C K M N Product Numbers 

6 in 12.40 12.40 18.70 39.25 18 5.12 6.81 

150 mm 315 315 475 997 457 130 173 

8 in 12.80 12.80 19.10 51 24 6.69 8.78 

200 mm 325 325 485 1295 610 170 223 

10 in 17 17 26.42 55.43 24 8.35 10.94 

250 mm 432 432 871 1408 610 212 278 

12 in 20.67 20.67 27.56 61.85 24 9.06 12.95 

300 mm 525 525 700 1571 610 230 329 

14 in 21.65 21.65 28.54 65 36 11.02 14.25 

350 mm 550 550 725 1651 914 280 362 

16 in 24.76 24.76 31.65 70 36 12.64 16.26 

400 mm 629 629 804 1778 914 321 413 

18 in 27.63 27.63 44.13 75 36 14.09 18.31 

450 mm 702 702 1121 1905 914 358 465 

20 in 28.98 28.98 46.22 79 36 15.63 20.31 

500 mm 736 736 1174 2007 914 397 516 

Two Way Inlet, Medium Operated 

Change Over Valve 

C 

B 

øK 

A A 

B1 

øM øN 

Y8AE150P 

Y8AE200P 

Y8AE250 

Y8AE300P 

Y8AE350P 

Y8AE400P 

Y8AE450P 

Y8AE500P 

89

90 Feed Water Heater Isolation Valve 

Sizes 8”– 18” 






Spring FV 520B (17/4 PH) 

Disc Guide 17/4 PHSS 


Press. 

Body Material 

ASTM 

Class 

A-216 WCB 

Spring Loaded 

Bypass Valve 

Shell Rev.Seat 

1690 psi 6350 450 

Dimensions 

Size 

bar 438 31 

Lift press. psi/bar 

Min. Max. 

C 

A 

øM øN 

A C M N Product Numbers 

8 in 20 44 35 23.6 6.69 8.78 

200 mm 1.4 3.0 889 399.4 169.9 223 

10 in 20 44 39 26.2 8.35 10.94 

250 mm 1.4 3.0 991 665.5 212.1 277.9 

12 in 20 44 44.5 32.1 10.04 12.99 

300 mm 1.4 3.0 1130 815.3 255 32.9 

14 in 20 44 49.5 37 11.02 14.25 

350 mm 1.4 3.0 1257 939.8 279.9 362 

16 in 20 44 53 39.1 12.64 16.26 

400 mm 1.4 3.0 1346 993.1 321 413 

18 in 20 44 61 41.3 14.09 18.31 

450 mm 1.4 3.0 1549 1049 357.9 465.1 

A73E200P 

A73E250P 

A73E300P 

A73E350P 

A73E400P 

A73E450P

Reheater 

Isolating 

Device 

Sizes 16” – 36” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 


91

92 

Reheater Isolating Device 

Sizes 16”– 36” 

ASME B16.34 

Introduction 

Hundreds of thousands of pounds per day are lost 

whenever a power plant closes! 

Repairs of installation facilities are frequently a part of a 

planned programme of maintenance. The downtime 

cost is figured into the operating budget. Even so, any 

innovation which can save time will also save significant 

amounts of money. 

A chief method for determining the effectiveness of the 

repairs done on plant pipelines is hydrostatic testing. In 

one area of a plant, the reheat tubes located in the 

boiler and the pipelines adjacent to the boiler, testing 

has been a time consuming and costly problem. 

Isolation of the tubes from the pipeline has been done 

by mechanically forcing a blind flange between two 

flanges welded into the line. This procedure is slow, 

difficult, awkward and expensive. 

Isolating of the hot reheat section has been traditionally 

achieved by closing the turbine intercept valve. 

However, turbine manufacturers and utilities have 

expressed some concern in relying solely on the turbine 

intercept valve as a stop valve. 

The Dewrance Reheater Isolating Device, (R.H.I.D.), 

however, allows hydrostatic testing to be conducted 

easily and efficiently on both the cold and hot reheat 

lines. On the cold reheat line, from the high pressure 

turbine, temperatures average 600-700 ˚F and pressures 

range from 600-700 psi. The R.H.I.D. has an ASME 500 

Intermediate rating and cast carbon steel 

(A.216 Gr. WCB) body material to satisfy pressure 

temperature requirements of the cold reheat line. 

On the reheat line, from the Reheater Section of the 

boiler, temperatures range trom 900-1025 ˚F and 

pressures from 500 to 1200 psi. ASME Class 900# R.H.I.D. 

with cast alloy steel (A.217 Gr. WC9) body material is 

utilized on the hot reheat lines. 

The R.H.I.D. also reduces the possibility of damaging the 

intercept valve by providing a reliable seal in front of 

the turbine intercept valve. 

After installation the R.H.I.D. is merely a conduit and 

during normal operation it is open and free from any 

component parts. 

When hydrostatic testing is to be done the system can 

be isolated by merely placing a closure in the path of 

the flow. This is accomplished by removing the bolted 

pressure seal joint from the R.H.I.D. fitting the Isolating 

Closure into position and then resetting the pressure 

seal. 

The R.H.I.D. is uniquely designed to take advantage of 

two different forces for establishing seals. During 

regular service the Body/Bonnet Joint is mechanically 

preloaded prior to operation. When steam passes 

through the line it reinforces the mechanical seal with 

pressure. The Isolating Closure used during hydrostatic 

testing is similar; it is mechanically preloaded before 

testing and water pressure acting on the closure 

upgrades the seal.


Sizes 16”– 36” 

ASME B16.34 

The Dewrance Reheat Isolating Device was developed to 

provide the simplest means of isolating a reheater for 

hydrostatic test. This test may be to prove the reheater 

during a planned shut-down which will prevent an 

unplanned shut-down later, or to carry out test after 

repair. The isolator is permanently welded into the 

pipelines on both sides of the reheater. 

The cast steel body has two parallel faces inside the 

centre chamber. One of these faces at the turbine end of 

the fitting is a sealing face which is deposited with 

austenitic stainless steel to prevent corrosion. Access to 

the centre chamber is provided by a proven pressure seal 

closure which has sufficient preloading to seal against 

the vacuum conditions experienced during start-up. 

Under normal working conditions the pressure is held by 

a stainless steel segmental ring through a forged steel 

bonnet and the sealing is effected by an asbestos sealing 

ring which is stainless steel reinforced. This sealing ring 

does not require a lapped surface or expensive metal 

inlay. 

During normal plant operation only the external 

pressure seal closure is used and the isolator body 

effectively becomes a part of the pipe with unobstructed 

passage. The Dewrance Reheat Isolating Device is simple 

High Pressure 

Turbine 

Turbine Stop and 

Governor Valves 

Boiler 

Stop Valve 

Cold 

“Reheater 

Isolating” 

Device 

Hot 

High Pressure Heaters 

Boiler – Turbine Plant Layout 

Intermediate Pressure 

Turbine 

Boiler 

Feed 

Pumps 

in design and compact in its construction. It has many of 

the merits of a Parallel Slide Gate valve without the 

bulk, weight, or expense. 

Before hydrostatic test, the top cover and bonnet are 

removed and the test closure assembly is then lowered 

into the centre chamber and located in the machined 

cradle in the lower part of the body. The test closure 

assembly consist of a disc with an “O” ring seal in the 

face, which contacts the stainless steel deposited faced 

within the body, and a captive preloading lever. The 

upper end of this lever is fitted with a single screw 

which, when turned in a clock-wise direction, 

compresses the “O” ring sufficiently to provide the 

initial seal. All other sealing pressure is provided by the 

test fluid itself. Replacing the top pressure seal closure 

isolates the reheater (or other plant) and is ready for 

hydrostatic test. 

The Dewrance Reheat Isolating Device provides a time 

saving method for doing hydrostatic testing, wet or dry 

lay-up and chemical cleaning. It provides an open 

pipeline during normal operation and an isolating 

closure that can be installed and removed in 4 to 5 

hours. 

Low Pressure 

Turbine 

From 

Deaerator 

To Condenser 

Generator 

Showing Location of Reheater Isolating Device on Cold & Hot Reheater Lines 

93

94 


Sizes 16” – 36” 

ASME B16.34 – 1996 


ASME B16.10 – 1992 




● Minimal parts with full bore seat for optimum 

performance and low pressure drop 

● Simple Isolating closure with one jacking stud 


● Pressure seal bonnet design gives maximum reliability 

with minimum maintenance 

● No replacement parts required (other than pressure 

seal) 


● Low cost isolating device 

● Simple method of isolation with full bore, low 

pressure drop 

● Ability to enter pipe system through cover for steam 

purge (chemical clean) 

1 

2 

3 

4 

5 

High Integrity Pressure Seal. The greater the 

force under the bonnet, the tighter the seal 

becomes at the body/bonnet joint. 

Light weight and resilient the pressure seal ring 

is made of exfoilated graphite. The pressure 

seal ring is retained in a cavity and under 

pressure expands radially. During field 

maintenance replacement of the pressure seal 

ring, or lapping of the pressure seal area is 

unnecessary. The need for an inlay or hone 

finish has been eliminated. 

High Integrity Seal Closure. The high integrity 

seal offers positive closing and zero leak for 

hydrotest. This high integrity seal allows for 

nitrogen layup and gas padding so a system 

may be charged with gas to eliminate 

corrosion. Once the seal has been placed in the 

position, the tightening of one unobstructed 

jacking stud gives a positively closed “zero 

leakage” seat seal. 

Top entry design. The Dewrance Reheat 

Isolator valve simplifies maintenance. It is not 

necessary to cut the valve out of line. There are 

no welds to break and cutting is eliminated. 

The top cover and bonnet are held to the body 

of the valve by means of jacking studs that 

firmly seal the bonnet against the flexible seal 

ring which is held in place by a segmented 

removable retaining ring. 

Low Pressure Drop. Once the isolator body is 

installed, it literally becomes part of the piping 

system. The straight in-line design allows a 

smooth, in-line flow with unobstructed 

passage. Pressure drop is therefore held to an 

absolute minimum. 

A chemical cleaning connection as an optional 

extra. 


1 

2 

5 

3 

4 

95

96 


Cold 



Prod. Page 

No. No. 

Cast 

R45 E 

A216 

WCB 

97 


Prod. Page 

No. No. 

Cast 

R45 E 

A216 

WCB 

97 


-20˚ 

to 200 300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

100˚ note ‘a’ 

Std. 1235 1125 1095 1058 1000 913 895 888 840 688 445 – – – – – – – 

ASME Code 

B16.34 


Spec. 1250 1250 1250 1250 1250 1188 1168 1158 1050 858 558 – – – – – – – 


-30˚ 

to 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

38˚ note ‘a’ 

Std. 85.1 83.5 77.3 75.4 73.1 69.7 64.6 61.6 60.7 57.5 48.0 33.4 – – – – – – 

ASME Code 

B16.34 


Spec. 86.2 86.2 86.2 86.2 86.2 86.2 83.1 80.3 78.8 71.9 59.9 41.7 – – – – – – 

Note ’a‘ – Permissible but not recommended for prolonged usage above 800˚F (425˚C). 

Hot 

Prod. 

No. 


Cast 

Page 

No. 

-20˚ 

to 

100˚ 

200 


300 400 500 600 650 700 750 800 850 900 950 975 1000 1025 1050 1075 

R61 L 

A217 

WC9 

97 

Std. 2250 2250 2185 2115 1995 1815 1765 1705 1595 1525 1460 1350 1130 955 

Spec. 2250 2250 2225 2175 2160 2160 2145 2135 2070 2020 1930 1800 1415 1195 

780 

975 

653 

815 

525 

655 

428 

533 

ASME Code 

B16.34 


Prod. 

No. 


Cast 

Page 

No. 

-30˚ 

to 

38˚ 

50 100 


150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 

R61 L 

A217 

WC9 

97 

Std. 155.1 155.1 154.6 150.6 146.2 139.0 128.6 120.7 116.5 109.8 105.4 101.4 95.1 83.4 64.9 

Spec. 155.1 155.1 154.9 153.3 150.2 149.1 148.9 147.7 146.6 142.6 139.5 134.1 126.4 107.1 81.2 

46.0 

57.5 

31.6 

39.4 

20.7 

25.7 

ASME Code 

B16.34 


Description Cold R.H.I.D. Hot R.H.I.D. 

Body Steel ASTM A-216 Gr. WCB ASTM A-217 Gr.WC9 

Bonnet Steel ASTM A-105 ASTM A-182-F-22 

Cover ASTM A-516 Gr. 70 ASTM A-182-F-11 

Pressure Seal Expanded Graphite Expanded Graphite 

Distance Piece Steel ASTM A-182-F-6 ASTM A-182-F-6 

Segment Ring Steel ASTM A-182-F-6 ASTM A-182-F-6 

Pressure boundary materials to ASTM specifications. All other materials 

to stated comparable U.S. specifications.


Sizes 16”– 36” 

ASME B16.34 

G 

øD 

Cold – ASME 500 Intermediate Rating B16.34 – 1996 

Test Nom. C E F G D B A Approx. Isolating 

Product No. Assembly Size Min. Max. Weight Closure 

Weight 

R45EZ400PFDA RZ0EZ400N 

16 

400 

in 

mm 

34 

864 

10.62 

270 

16.38 

416 

30.43 

773 

21.54 

547 

14.61 

371 

16.26 

413 

lb 

kg 

882 

400 

146 

66 


18 

450 

in 

mm 

37 

940 

11.61 

295 

17.72 

450 

33.54 

852 

23.62 

598 

16.50 

419 

18.27 

464 

lb 

kg 

1477 

670 

196 

89 


20 

500 

in 

mm 

41 

1041 

12.48 

317 

18.86 

479 

36.26 

921 

25.67 

642 

57.76 

467 

20.31 

516 

lb 

kg 

1929 

875 

245 

111 


22 

550 

in 

mm 

44 

1118 

13.70 

348 

20.83 

529 

40.35 

1025 

27.76 

724 

20.24 

514 

22.72 

577 

lb 

kg 

2976 

1350 

328 

149 


24 

600 

in 

mm 

48 

1219 

14.64 

372 

22.68 

576 

43.46 

1104 

31.14 

772 

22.01 

559 

24.37 

619 

lb 

kg 

3197 

1450 

417 

189 


26 

650 

in 

mm 

51 

1295 

15.67 

398 

24.53 

623 

46.65 

1185 

33.19 

827 

24.02 

610 

26.42 

671 

lb 

kg 

4034 

1830 

516 

234 


28 

700 

in 

mm 

54 

1372 

16.61 

422 

26.84 

669 

50.04 

1271 

35.63 

875 

25.98 

660 

28.43 

722 

lb 

kg 

4630 

2100 

626 

284 


30 

750 

in 

mm 

56 

1422 

17.64 

448 

28.31 

719 

53.03 

1347 

37.64 

920 

27.72 

704 

30.47 

774 

lb 

kg 

5335 

2420 

752 

341 


32 

800 

in 

mm 

61 

1549 

18.74 

476 

29.92 

760 

56.61 

1438 

36.69 

989 

29.49 

749 

32.52 

826 

lb 

kg 

6834 

3100 

915 

415 


34 in 64 19.80 31.34 59.92 42.76 31.50 34.53 lb 7915 1089 


øA 

Product No. R45E, R61L 

øB 

Hot – ASME Class 900 B16.34 – 1996 

850 mm 1626 503 796 1522 1047 800 877 kg 3590 494 

36 in 68 20.67 33.54 62.76 45.20 32.80 36.57 lb 8818 1257 

900 mm 1727 525 852 1594 1110 833 929 kg 4000 570 

Test Nom. C E F G D B A Approx. Isolating 

Product No. Assembly Size Min. Max. Weight Closure 

Weight 

R61LZ400PFDA RZ0EZ350N 

16 

400 

in 

mm 

34 

864 

10.43 

265 

18 

447 

29.96 

761 

21.54 

547 

13.94 

354 

16.26 

413 

lb 

kg 

1398 

634 

128 

58 


18 

450 

in 

mm 

37 

940 

11.26 

286 

18.94 

481 

32.68 

830 

23.62 

600 

15.87 

403 

18.27 

464 

lb 

kg 

1543 

700 

146 

66 


20 

500 

in 

mm 

41 

1041 

12.32 

313 

20.51 

521 

36.02 

915 

25.67 

652 

17.44 

443 

20.31 

516 

lb 

kg 

2425 

1100 

196 

89 


22 

550 

in 

mm 

44 

1118 

13.23 

336 

21.93 

557 

39.17 

995 

27.76 

705 

19.17 

487 

22.72 

577 

lb 

kg 

3086 

1400 

245 

111 


24 

600 

in 

mm 

48 

1219 

14.53 

369 

23.86 

606 

43.15 

1096 

31.14 

791 

20.91 

531 

24.37 

619 

lb 

kg 

4189 

1900 

328 

149 


26 

650 

in 

mm 

51 

1295 

15.59 

396 

25.95 

659 

46.54 

1182 

33.19 

843 

22.64 

575 

26.42 

671 

lb 

kg 

5049 

2290 

417 

189 


28 

700 

in 

mm 

54 

1372 

16.65 

423 

28.07 

713 

50 

1270 

35.63 

905 

24.41 

620 

28.43 

722 

lb 

kg 

6173 

2800 

516 

234 


30 

750 

in 

mm 

56 

1422 

17.68 

449 

30.08 

764 

53.35 

1355 

37.64 

956 

26.14 

664 

30.47 

774 

lb 

kg 

7143 

3240 

626 

284 


32 

800 

in 

mm 

61 

1549 

18.78 

477 

32.24 

819 

56.50 

1435 

36.69 

1008 

27.87 

708 

32.52 

826 

lb 

kg 

8598 

3900 

752 

341 


34 in 64 19.92 34.25 60.63 42.76 29.61 34.53 lb 10802 915 


850 mm 1626 506 870 1540 1086 752 877 kg 4900 415 

36 in 68 21.10 35.87 64.17 45.20 31.38 36.57 lb 12853 1089 

900 mm 1727 536 911 1630 1148 797 929 kg 5830 494 

C 

F 

E 

97

98 


Features and Benefits 

Single seal 

preloading 

screw 

Captive 

lever 

Eyebolts 

‘O’ ring seal 

on face 

The Components 

The Isolating Closure consists of two principal pieces, 

isolating disc and backing plate. The preloading bolt 

(see Detail) is threaded into the backing plate. As the 

preloading bolt head is turned, it comes in contact with 

the face opposite the seat. From this point the top of 

the backing plate is forced away from the face opposite 

the seat, pivoting about the dome nut, until the bottom 

of the plate comes into contact with the face opposite 

the seat. Additional turning of the preloading bolt head 

results in the dome nut applying axial seating pressure 

to the isolating disc. 

Isolating Closure Installation 

The Isolating Closure is designed to be handled as one 

assembly. There are two eye bolts on the disc to assist in 

installation. The backing plate is held to the disc by two 

cap screws, but the backing plate is free to move axially. 

The Isolating Closure is lowered into the body, the 

preloading bolt tightened, which seats the “O” ring to 

the body. After the pressure seal assembly has been 

installed, the system is ready for hydrostatic testing. The 

testing pressure will cause the ring to seal even more 

tightly. 

Down stream leakage, past the “O” ring, should it occur 

can be determined by removing the pipe plug at the 

bottom of the body. 

After hydrostatic testing, the Isolating Closure is 

removed and the pressure seal assembly reinstalled. 

What the Dewrance Reheater Isolating 

Device Offers: 

To the Specifying Engineer, an Alternative! 

Whether for new construction or retrofit, there is now a 

workable choice other than blanking flanges for 

isolating a section of pipeline. 

To the Maintenance Engineer, Ease of Operation! 

One unit permits an efficient means of doing hydrostatic 

testing, wet or dry lay-up and chemical cleaning. 

To the Plant Chief Engineer, Savings Through Efficiency! 

Compared with the blanking flange method, the 

Isolating Closure is clearly better. Furthermore, it will pay 

for itself. Upon completion of the second operation the 

accumulated savings in reduced down-time and 

maintenance labour could cover the purchase cost. 

To the Plant Operations Manager, Increased Profitability! 

Consider the versatility, efficiency and savings of the 

Dewrance Reheater Isolating Device, then the impact on 

the “bottom line” is self evident.

Quick Guide to Product Numbering Systems 

PRESSURE CLASS 

21/22 – 150 Class 

31/32 – 300 Class 

51/52 – 600 Class 

67 – 1000 Class 

73 – 1690 Class 

8A – 1715 Class 

83 – 2260 Class 

91 – 2500 Class 

95 – 2850 Class 

X7 – 4500 Class 

VALVE TYPE 

A Automatic bypass valves 

B Bled steam check valve 

C 

E Leak off valve 

F Tilting disc check valve/ 

Swing check valve 

G 

K 

L Automatic non-return valves 

M Stop valves 

N Screw down non-return valves 

P Parallel slide valves 

R Reheater Isolators 

T 

U Special products 

W Feed heater isolators 

Y Feed water heater divertor 

Z Miscellaneous 

NOMINAL END SIZE (mm) 

MINOR DESIGN CHANGE 

N Non return 

T/P Standard flow 

S/R Venturi 

ANCILLARY VALVE 

ARRANGEMENT 

B One by-pass 

C One equalizing by-pass 

D One by-pass & one equalizing 

by-pass 

F No by-pass 

G Equalizing pipe 

H Vee port seat 

J One by-pass & one by-pass 

drain valve 

K One drain valve 

L One equalizing pipe & one 

drain valve 

M Vee port seat & 

equalizing pipe 

END CONNECTION 

Even number – Flanged 

Odd number – Butt weld 

P95EH200PFDA 

BODY MATERIAL 

D ASTM A105 

E ASTM A216 Gr WCB 

J ASTM A217 Gr WC6 

K ASTM A182 Gr F22 

L ASTM A217 Gr WC9 

R ASTM A217 Gr C12A 

VALVE OPERATION 

ON SPECIALITY 

A Bevel gear op. from below 

B Bevel gear op. from above 

C Chain Wheel 

D Hydraulic actuator 

E Direct mtd. Limitorque 

F Sleeve coupling 

G Bevel gear local operation 

H Local handwheel operation 

L Locking device 

M Adaptor plate 

N Pneumatic actuator 

P Spur gear op. from below 

Q Spur gear op. from above 

R Direct mounted Rotork 

T Universal joint 

U Undrilled or block ends 

with handwheel 

V Special 

W Power assisted 

Y Direct mtd. Auma actuator 

Z No external operator 

MINOR PRODUCT VARIATION 

BY-PASS OPERATION 

A Bevels op. from below 

B Bevels op. from above 

C Chain wheel 

D No by-pass 

E Direct mtd. Limitorque 

actuator 

F Sleeve coupling 

G Local op. through bevel gear 

H Local handwheel 

L Locking device 

N 

P Spur gear op. from below 

Q Spur gear op. from above 

R Direct mtd. Rotork actuator 

Y Direct mtd. Auma actuator 

99

100 

Materials of Construction 

ASTM specification Ferrous 

TYPE FORGINGS CASTINGS STUDS 

MAIN USE BONNETS, COVERS,SEATS DISCS VALVE BODIES COVERS, GLANDS 

ASTM SPEC A105 A182 A276 A182 BS970 A182 A216 A217 A217 ASTM A743 A193 A193 A193 

(UNS) F22 420 F347 316S31 F91 WCB WC6 WC9 GR.C12A GR.B7 GR.B16 GR.B6 

CARBON % 0.75 max 0.15 max 0.15 min 0.08 max 0.07 0.08/0.12 0.30 max 0.20 max 0.05/0.18 0.12 0.37/0.49 0.36/0.47 0.15 max 

SILICON % 1.5 max 0.5 max 1.0 max 1.0 max 1.0 0.2/0.5 0.6 max 0.6 max 0.6 max 0.2/0.5 0.15/0.35 0.15/0.35 1.0 max 

MANG.% – 0.3/0.6 1.0 max 2.0 max 2.0 0.3/0.6 1.0 max 0.5/0.8 0.40/0.70 0.3/0.6 0.65/1.1 0.45/0.70 1.0 max 

CHROM.% – 2.0/2.5 12.0/14.0 17.0/20.0 16.5/18.5 8.0/9.5 *0.5 max 1.0/1.5 2.0/2.75 8.0/9.5 0.75/1.2 0.80/1.15 11.5/13.5 

MOLYBD.% 0.87/1.13 – – 2.0/2.5 0.85/1.05 *0.20max 0.45/0.65 0.90/1.2 0.85/1.05 0.15/0.25 0.50/0.65 – 

NICKEL % – – – 9.0/13.0 10.5/13.5 0.4 max *0.5 max *0.5 max *0.50 max 0.4 – – – 

COPPER – – – – – *0.3 max 0.5MAX *0.50 max – – – – 

SULPHUR 0.08 max 0.04 max 0.03 max 0.03 max 0.03 0.01 max 0.045 max 0.045 max 0.045 max 0.018 0.04 max 0.040 max 0.03 max 

PHOSP. % 0.08 max 0.04 max 0.04 max 0.045max 0.045 0.02max 0.04 max 0.04 max 0.04 max 0.02 0.035 max 0.035 max 0.04 max 

NIOBIUM % – – – – – – – – – – – 

VANADIUM 75/85 – – – – 0.03 – – – 0.25/0.35 – 

ALMUMIN.% 2.0 max – – – – – – – – 0.015 max – 

IRON % BAL BAL BAL BAL BAL BAL BAL BAL BAL BAL BAL BAL BAL 

U.T.S.ksi min 70 60 75 74 85 70 70 70 85 125 125 110 

YIELD ksi min 36 30 30 30 60 36 40 40 60 105 105 85 

*RESIDUAL ELEMENTS TOTAL 1.0%MAX 

TYPE PLATE BAR NUTS 

MAIN USE COVERS STEMS PILLARS COVERS, GLANDS 

ASTM SPEC ASTM A516 A276 ASTM A565– A108 A193 A194 A194 A194 

(UNS) GR 70 S43100 XM32 G10200 GR.B7 GR.2H GR.4 GR.B8 

CARBON % 0.18/0.31 0.2 max 0.08/0.15 0.18/0.23. 0.37/0.49 0.40min 0.4/0.5 –0.08 max 

SILICON % 0.13/0.45 1.0 max 0.35 max – 0.15/0.35 0.4 max 0.15/0.35 1.0 max 

MANG.% 0.6/1.2 1.0 max 0.5/0.9 0.3/0.6 0.65/1.1 1.0 max 0.7/0.9 2.0 max 

CHROM.% – 15/17 11/12.5 – 0.75/1.20 – – 18.0/20.0 

MOLYBD. % – 1.5/2.0 – 0.15/0.25 – 0.20/0.30 – 

NICKEL % – 1.25/2.50 2.0/3.0 – – – 8.0/10.5 

COPPER – – – – – – – – 

SULPHUR 0.035 max 0.03 max 0.025 max 0.05 max 0.04 max 0.05 max 0.04 max 0.03 max 

PHOSP. % 0.035 max 0.04 max 0.025 max 0.04 max 0.35 max 0.04 max 0.035 max 0.045 max 

NIOBIUM % – – – – – – – – 

VANADIUM – – 0.25/0.40 – – – – – 

ALMUMIN.% – – – – – – – – 

IRON % BAL BAL BAL BAL BAL BAL BAL BAL 

U.T.S.ksi min 55 115 100 

YIELD ksi min 30 75 75 

Ferrous Non Ferrous 

TYPE NON FERROUS 

MAIN USE SLEEVE GLAND 

ASTM SPEC B150 

(UNS) C63000 

ALMUMIN.% 9.0–11.0 

SILICON % 0.25 max 

MANG.% 

TIN. %0.2 max 

1.5 max 

ZINC % 0.3 max 

NICKEL % 4.0–5.5 

COPPER BAL 

IRON % 2.0–4.0 

PHOSP.% – 

NIOBIUM % – 

VANADIUM – 

LEAD % – 

U.T.S.ksi min 94 

YIELD KIS MIN 46

Recommended Spare Parts Holding by product 

Class I – Start-up/Consumable 

Class II – 1–5 Years 

Operational Spares 

Class III – 5–10 Years 

Major Overhaul 

Parallel Check Valves Bled Steam Feed Heater Reheater 

Slide Valves Check Valves Isolation Isolation 

Device Devices 

Class I Bonnet Gasket ● ● ● 

Closure Seal ● 

Gasket ● 

Gland Packing ● ● 

Hinge Pin Gasket ● ● 

‘O’ Rings ● 

Pressure Seal ● ● ● ● ● 

Class II Discs ● 

Disc Assembly ● 

Disc Clips ● 

Disc/Disc Assembly ● 

Disc Springs ● 

Gland ● ● ● 

Gland Ring ● 

Hinge Pin ● ● 

Hinge Pin Bush ● ● 

Hinge Pin Housing ● ● 

Neck Bush ● ● ● 

Stems ● 

Stem/Belteye Assy. ● 

Stem Stop ● ● 

Valve Head ● 

Valve Head Nut ● 

Class III Bonnet ● ● ● ● 

Bonnet Collar ● 

Collar ● 

Cover ● ● ● ● ● 

Distance Piece ● ● ● ● ● 

Gland Flange ● ● ● 

Pillars ● ● ● 

Screwed Plug ● 

Segment Ring ● ● ● ● 

Split Ring ● ● 

Thrust Plate ● 

Yoke Bush ● 

101

DEWRANCE 

HEADQUARTERS IN THE UK 

UNITED KINGDOM 

Dewrance 

White Moss Business Park 

Moss Lane View 

Skelmersdale 

Lancashire 

WN8 9TN 

England 

Tel: +44 (0)1695 554800 

Fax: +44 (0)1695 554835 

E mail: dewrance@Tyco-Valves.com 

JAPAN 

Nippon Keystone Corporation 

1-5-1, Murotani 

Nishi-ku 

Kobe 

Japan 

Tel: +81 78 992 6401 

Fax: +81 78 992 4571 

UNITED STATES 

Yarway Corporation 

P O Box 350 

480 Norristown Road 

Blue Bell 

Pennsylvania 

USA 

Tel: +1 610 825 2100 

Fax: +1 610 825 1235 

SINGAPORE 

Yarway Corporation 

No.45 Tuas Avenue 9 

Singapore 

639189 

Tel: +65 861 1655 

Fax: +65 861 6997 

Because of a policy of continuous product improvement Dewrance reserve the right to 

change designs, materials or specifications without notice. 

GLASGOW 

SKELMERSDALE 

LIVERPOOL 

EDINBURGH 

BIRMINGHAM 

BRISTOL 

MANCHESTER 

A INTERNATIONAL LTD. COMPANY © 1999 

M58 

M6 

J26 

M5 

M6 

M4 

M1 

M62 

LONDON

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