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

2. 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

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.