Double Flanged Rubber Lined Butterfly Valve Good quality with favarouble price. SpecificationsDouble Flanged Butterfly Valve 1)Size: DN40-DN1400 2)Material ... projects, urban water supply and drainage, sewage treatment, electric power, petroleum, petrochemical, heat supply, shipbuilding, medicine and metallurgy ... GB, ASME, ANSI, API, BS, DIN, JIS etc. Double Flanged Rubber Lined Butterfly Valve