casting steel ball valve ISO9001:2000 Approved Process:precision casting Standard:JIS,DIN,ASTM,BS OEM service available casting steel ball valveWe are a ... :2000 Approved 2.OEM service available 3.Materials: stainless steel,cast iron,pig iron,carbon steel,alloy steel,non-ferrous,grey ... iron,ductile cast iron and so on 4.Process: lost wax process, soluble ...