... ,4.0 Material:stainless steel Connection:flange,thread etc. Electric Cremic ball valve1.DN:40-400MM 2.PN:1.0 ... 3. Ceramic valves can increase the tightness of industrial piping systems, while able to prevent disclosure of the maximum of environmental ... mineral resources. Wear-resistant ceramic valves are mainly used in electric power, petroleum, chemical, metallurgy, mining, sewage treatment and other ...