Stainless Steel Check Valve (H44, Class 150~1500) CLASS 150~1500 SWING CHECK VALVE Bolted cover, swing type disc Threaded or welded seat ring ASTM A216 WCB, A217 WC Standards compliance Design and Manufacture: ANSIB16.34, API6D, BS11868 Face to face(end to end): ANSIB16.10, API6D Flanged connection: 2"~24"to ANSIB16.5, 22", 26"~36"to MSS-SP-44 to API605 on Request Butt welded end: ANSIB16.25 Test and inspection: API598,