check valve.swing type,flange type. Sizes:DN50~DN600. check valve,swing type,flange type.Design & manufacture standard: API6D, ANSI/ASME B16. ... , 600Lb, 900Lb or PN 2.0MPa~PN 15.0MPa or JIS 10K, 20K.Nominal diameters: 2~ 24or DN50~DN600.Major materials ... , A105, CF8(304), CF8M(316), CF3(304L), CF3M(316L), etc. check valve