1) Design and manufacture : By ANSI . B16. 34; API 603.

2) Size-end connectivity:

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

* Screw terminal size: By ANSI B1. 20. 1 ISO7/1

3) Valve inspection and testing: By API 598

4) Structure: B. B; OS& Y

5) Materials: By AISI/ASTM Provisions

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