... ,BS;ISO:NF Butterfly valve body and disc CastingsCast iron and cast steel,aluminium and bronze castingMaterial:Cast steel,ductile iron, ... parts, valves parts, pump parts, vehicle parts, marine parts and other machinery parts, materials are as follows: ItemDescriptionMaterialTechnical Process1Ductile ... 20,25,30,35,40,45,50;ASTM A126-Class A, Class B, Class C;DIN-GG10,GG15,GG20,GG25,GG30,GG35;JIS ...