... ,BS;ISO:NF Butterfly valve body and disc CastingsCast iron and cast steel,aluminium and bronze castingMaterial:Cast steel,ductile iron ... ,grey iron,aluminium and bronze alloyMethod:Sand cast,lost wax castingStandard:ASTM ... of steel castings, ductile iron and grey iron castings, aluminium and bronze castings with machining such as electromotor parts, valves ...