1)design and manufacture: according to JPI-7S-36,ANSI B16.34,API602,BS5352. 2)socket end:according to ANSI B16.11,JB/T1751. 3)screw end:according to ANSI B1.20.1(NPT),GB/T7306-87(RC) 4)valve check and test:API598 5)body material:A105,LF2,F11,F22,F5,F304,F316,F304L,F316L etc. 6) sealing face:13Cr/13Cr,STL/STL,13Cr/STL,304/304,18-8/STL,18-8/18-8 etc. 7) Class is from 150LB~800LB or 900LB~1500LB.
