ANSIB16.34, API6D, BS11868ANSIB16.10,API6D 2~24to ANSIB16.5, 26~36to MSS-SP-44 ANSIB16.25 API598, API6DKinma Swing Check Valve has bolted body cover, swing type disc and threaded or welded seat ring. And the material could be ASTM A216 WCB,A217 WC6,A..