Double Flanged Rubber Lined Butterfly Valve Good quality with favarouble price. SpecificationsDouble Flanged Butterfly Valve 1)Size: DN40- ... butterfly valves, check valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless steel ... and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. Double Flanged Rubber Lined Butterfly Valve