... type,flange type. Sizes:DN50~DN600. check valve,swing type,flange type.Design & manufacture standard: API6D, ANSI/ ... , BS1868.Face to face dimensions: ANSI/ASME B16.10.Flange connection: ANSI/ASME B16.5 for NPS24,ASME B16.47A/MSS ... , A105, CF8(304), CF8M(316), CF3(304L), CF3M(316L), etc. check valve