Double flanged butterfly valve 1.High quality and competitive price 2.Comply to BSEN Design 3.DN100- ... projects, urban water supply and drainage, sewage treatment, electric power, petroleum, petrochemical , heat supply,shipbuilding, medicine and metallurgy industries. Equipment ... media include water, sewage, seawater, air, foodstuff and oil. Suitable for handles (DN50~300), gear operators,electric ...