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.