... Valve 1:material:ductile iron/grey iron/carbon steel 2Machine:Lathe,CNC,Drilling machine,Milling machine, Q41F-16C Ball Valve 1MaterialDuctile cast iron ... cast iron2SandGreen sand,sodium silicate sand 3MachineLathe,CNC,Drilling machine,Milling machine,Boring machine,Planing machine 4ProcessSand Casting 5Min Tolerance0.05mm 6Productioncapacity0.5-5000kg ...