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; OS& Y or W.B; OS& Y

5) Materials: By AISI / ASTM Provisions

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

7) Application of the medium: water, steam, oil, etc.