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Wedge Gate Valve

2021-03-25 11:32:03 110

● STANDARD FEATURES OF WEDGE GATE VALVES

1. Main Adopt Standards● 

(1) Design and manufacture as per API 600 , API 602, ASME B16.34. 

(2) Flanged ends dimension as per ASME B 16.5(NPS2~24),

      ASME B16.47(NPS >24) , 

      MSS-SP-44(NPS 22). 

(3) Welded ends dimension as per ASME B16.11.

(4) Threaded ends dimension as per ASME B1.20.1. (5) End-to-end dimension as per ASME B16.10.

(6) Pressure test as per API 598. 

2. Connection between body and bonnet

(1) For Cl150~Cl900: bolted bonnet construction;

(2) For Cl1500~Cl2500: pressure seal bonnet construction.

3. Driving design

Valve drive usually has manual or gear operation, according to customer requirements can choose pneumatic, electric, etc.

4. Stem packing

We usually uses expanded graphite to make stem packing. Based on customer requirements, PTFE or other materials can also be used. The surface area of the stuffing box in contact with the packing has an accuracy of Ra 3.2um. The surface of the valve stem in contact with the packing is finely ground by a grinder, its surface finish is (Ra 0.8 um) to ensure effective sealing between the valve stem and the packing.

5. Back seat design 

All gate valves of our company are equipped with upper sealing structure. For stainless steel gate valves, the upper seal is directly processed on the valve cover. As for the carbon steel gate valve, the upper seal is a separate structure, which is fitted on the valve cover through threads. This ensures that the sealing performance of the upper seal will be very reliable when the valve is in the fully open position. According to the requirements of API 600, a sealing structure is provided between the valve stem and the bonnet. However, it cannot be understood as a recommendation and suggestion by the manufacturer that the packing can be added or replaced by the upper seal when the valve is under pressure.

6.Seats 

For carbon steel gate valves, forged steel is usually used for the valve seat. The seat sealing surface can be welded with alloy steel or hard alloy according to customer requirements.

For stainless steel gate valves, an integral valve seat is usually used, or it is directly welded with hard alloy.

7. Stem

The stem is adopted with an integral forged steel design. The minimum size should meet the requirements of API600 standard. The stem is connected to the gate by a T-shaped structure, and the strength of the connection is greater than the trapezoidal thread part of the stem.

8. Yoke

Generally, for NPS2 to NPS8 gate valves, the yoke should be integral type, for gate valve size above NPS 10", the yoke should be split type.

9. Stem Nut

Generally, the stem nut is made of aluminum bronze alloy. It can also be manufactured in accordance with ASTM A439 D2 according to user requirements.

10. Optional Material

According to customer requirements, our company will select the material suitable for the corresponding medium according to the different working conditions.

Material

Minimum Temperature

Maximum Temperature

F

C

F

C

A216 WCB

-20

-29

800

427

A217 WC1

-20

-29

800

427

A217 WC6

-20

-29

1100

593

A217 WC9

-20

-29

1100

593

A217 C5

-20

-29

1200

649

A217 C12

-20

-29

1200

649

A352 LCB

-50

-46

650

343

A352 LCC

-50

-46

700

371

A352 LC1

-75

-59

700

371

A352 LC2

-100

-73

750

343

A352 LC3

-450

-101

650

340

A351 CF8M

-425

-254

1500

816

A351 CF3M

-425

-254

850

454

● STANDARD MATERIALS FOR CAST STEEL WEDGE GATE VALVES 

Part Name

 WCB Series

 304

Series

316

Series

 CrMoV Series

Low temp.

Series

 Anti-sulfur series

Body

A216

WCB

A351-CF8

-CF3

 A351-CF8M

-CF3M

 A217-WC6

-WC9

-C5

-C12A

 A352-LCB

-LCC

 A351-CF8M

Bonnet

Wedge Gate

 Seat Ring

 A105

A182-F304

-F304L

A182-F316

-F316L

A182-F11 F22

-F5

 A350-LF2

 A182-F316

Seat Seals

See attachment below

Body-Bonnet

Gasket

 304+Graphite

Bolt

A193-B7

A193-B8

A193-B8

A193-B16

A320-L7

A193-B7

Nut

A194-2H

A194-8

A194-8

A194-4

A194-4

A194-B7

Stem Packing

Flexible Graphite

Stem Nut

A439-D2/ZQAL9-4

Note: Other materials can be selected based on customer requirements.

● STANDARD MATERIALS FOR FORGED STEEL WEDGE GATE VALVES

 Part Name

 A105 Series

 304 Series

 316 Series

 CrMoV Series

Low temp.

Series

Body

 A105

 F304/F304L

 F316/F316L

 F5/F11/F22

 LF2

Bonnet

 Wedge Gate

 A105/F6a

 F304/F304

 F316/F316L

 A276-420

 A276-420

Seat Ring

 A276-410

 F304/F304L

 F316/F316L

 A276-410

 A276-410

Seat Seals

See attachment below

Body-Bonnet

Gasket

 304+Graphite

Nut

A194-2H

A194-8

A194-8

A194-4

A194-4

Stem Packing

304+Graphite

 Stem Nut

 A276-410

Note: Other materials can be selected based on customer requirements.

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Our unique technology and experience accumulated over the years, different valve operating conditions and pressure have different solutions, which is the key to maintain the lasting innovation of avionics valve

CONTACT US

Chengdu Holy Valve & Complete Equipment Co.,Ltd.

Add:No. 10, Gaopeng Avenue, High-tech District, Chengdu City, Sichuan, China
Post Code:610041
Tel:86-28-85148860
FAX:86-28-85148861
E-MAIL:
sales@holy-valve.com 


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