OS&Y, Rising stem, Plug Disc Bolted Bonnet, Threaded or welded seat ring ASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M, A351 C OS&Y, Rising stem, Plug DiscBolted Bonnet, Threaded or welded seat ringASTM A216 WCB, A217 WC6, A351 CF8, A351 CF8M,A351 CF3, A351 CF3M,A351 CN7M Product DetailsDesign and ManufactureANSIB16.34,BS1873Face to face(end to end)ANSIB16.10Flanged connectionANSI B16.5Butt welded ...