... :DN100~DN4000 Nomial pressure:PN6-PN25 Material:carbon steel,stainless steel Butterfly valve:1) Material: body-CI/DI/WCB 2) ... widely used in water source projects, urban water supply and drainage, sewage treatment, electric power, petroleum, petrochemical , ... heat supply,shipbuilding, medicine and metallurgy industries. Equipment are used for regulatingor cutting off ...