... reliable sealing. 2, used thermometal for valve and semi ball, weld different alloy steel on the ball ... Body material : WCB,LCB,304, 316,WC9 Semi-ball material : WCB+chrome, 304+HF, 316 ... 304,316, F22a, PTFEApplicable standard for Valve :Design and Manufacture according to: API608 Length of Face to face ... 16.10 Flange size standard: ASME B 16.5 Test and inspection standard: API608NPS : 2''-56'' ( 50mm - ...