This check valve has three types:CS to ASTM, AS to ASTM, SS to ASTM
A. Design and manufacture : By ANSI . B16. 34; API 602.
B. Size-end connectivity:
1) Jack for size: By ANSI B16. 11; JIS B2306
2) Screw terminal size: By ANSI B1. 20. 1 BS21; JIS B0203; ISO7/1
C. Valve inspection and testing: By API 598
D. Structure: B. B; Just back off and landing or B. B, Spin back to the start-stop or B. B, Take-off and landing with a spring-return
E. Materials: By AISI/ASTM Provisions
F. The main material: A105; F5; F11; F22; 304; 304L; 316; 316L; LF2, etc.
Application of the medium: water, steam, oil, etc.