... ,flange type. Sizes:DN50~DN600. check valve,swing type,flange type.Design & manufacture standard: API6D, ANSI/ASME ... standard: API6D, API598.Pressure: 150Lb, 300Lb, 600Lb, 900Lb or PN 2.0MPa~PN 15.0MPa or JIS 10K, 20K.Nominal diameters ... : 2~ 24or DN50~DN600.Major materials: WCB, WC1, WC6, WC9, A105, CF8(304), CF8M(316), CF3(304L), CF3M(316L), etc. check valve