Applied Standard
1. Design and Manufacture: According to Standard:API 602.
2. Connection:
   (1)Socket Weld   

 (2)Threaded End

 (3)Butt welding

(4)Flanged

3. Testing of Valves:According to API 598.

4. Main Materials A105;F5;F11;F22;304;304L;316;316L;Lf2 ,20 Alloy,Monel ,etc.