This check valve has three types: CS to ASTM, AS to ASTM, SS to ASTM

1) Design and manufacture : By ANSI . B16. 34; API 602.

2) Size-end connectivity:

* Jack for size: By ANSI B16. 11; JIS B2306

* Screw terminal size: By ANSI B1. 20. 1 BS21; JIS B0203; ISO7/1

3) Valve inspection and testing: By API 598

4) 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

5) Materials: By AISI/ASTM Provisions

6) The main material: A105; F5; F11; F22; 304; 304L; 316; 316L; LF2, etc.

* Application of the medium: water, steam, oil, etc.