Forged Gate Valve


Coosai Forged steel gate valves are provided with three types of bonnet design. Firstly bolted bonnet, with valve body and bonnet bolted, spiral wound gasket (made of 304 with flexible graphite) or sealed by metal ring junction. Secondly, welded bonnet, with the body and bonnet threaded, all welded seal. Full penetration welded connection may apply in case of customer's special request. Thirdly, pressure self- tightening bonnet, with the body and bonnet threaded, sealed by inside pressure self- tightening ring.


1. Design and manufacture: API 602

2. Dimensions of Connection End :

1) Socket dimensions to ANSIB16.11; 

2) Thread end dimensions to ANSI B1.20.1; 

3) Butt-weld end dimensions to ANSIB16.25;

4) Flange end dimensions to ANSIB16.5.

3. Valve check and test:API 598; 

4. Structural Features:

Bolted bonnet (B.B) and outside screw and yoke (OS&Y)or welded bonnet (W.B) and outsidescrew and yoke (OS&Y).

5. Material to the specifications of ANSI/ASTM.

6. Body material: A105; LF2; F5; F11; F22; 304(L); 316(L); F347; F321; F51; Monel; 20 alloy,  and so on.

7. Size:1/2"~ 2"

8. Class: 800LB~2500LB


Coosai Forged steel gate valves are provided with three types of bonnet design. Firstly bolted bonnet, with valve body and bonnet bolted, spiral wound gasket (made of 304 with flexible graphite) or sealed by metal ring junction. Secondly, welded bonnet, with the body and bonnet threaded, all welded seal. Full penetration welded connection may apply in case of customer's special request. Thirdly, pressure self- tightening bonnet, with the body and bonnet threaded, sealed by inside pressure self- tightening ring.


1. Design and manufacture: API 602

2. Dimensions of Connection End :

1) Socket dimensions to ANSIB16.11; 

2) Thread end dimensions to ANSI B1.20.1; 

3) Butt-weld end dimensions to ANSIB16.25;

4) Flange end dimensions to ANSIB16.5.

3. Valve check and test:API 598; 

4. Structural Features:

Bolted bonnet (B.B) and outside screw and yoke (OS&Y)or welded bonnet (W.B) and outsidescrew and yoke (OS&Y).

5. Material to the specifications of ANSI/ASTM.

6. Body material: A105; LF2; F5; F11; F22; 304(L); 316(L); F347; F321; F51; Monel; 20 alloy,  and so on.

7. Size:1/2"~ 2"

8. Class: 800LB~2500LB


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