cast iron valve : 1)Valve meterial: Gray ductile iron 2)Valve Specification:50-300mm 3)Valve Standard: JIS, ANSI, ... -300mm cast iron check valve:1) the parts of Globe valve , Check valve, Butterfly valve, Gate valves, Smolensky etc.2) valve material: gray iron, ductile iron.3 ... products,please do not hesitate to contact us. 50-300mm cast iron check valve