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OS&Y, Rising stem, Plug Disc Bolted Bonnet, Threaded or welded seat ring ASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M, A351 CF3, A351 CF3M,A351 CN7M Standards compliance Design and Manufacture: ANSI B16.34, BS1873 Face to face(end to end): ANSI B16.10 Flanged connection: to ANSI B16.5 Butt welded end: ANSI B16.25 Test and inspection: API598
