Wafer butterfly valves are newly developed on the basis of advanced foreign technology. They are of simple structure, small size, light weight and high corrosion resistance, and are easy to open and close. They are widely used in place of globe valves, gate valves and throttle valves in drainage systems, hydraulic power stations as well as production of petro-chemicals, light industrial products, textiles and foodstuffs. Feature: 1) Standards: a) Manufacture: GB12238, JB/T8527, API609 b) Face to face/end to end dimensions: ANSI B16.10, GB12221 c) Pipe flange: JB/T74 90, GB12380, HG20615~20635, SH3006, ANSI B16.5 d) Testing and inspection: GB/T13927, API598 2) Body materials: CI, DI, WCB, SS Disc: DI, SS304, SS316, Aluminum Bronze Split Stem: WCB, SS416, SS304, SS316 Seat: NBR, EPDM, PTFE, VITON 3) Flange drilling: DIN PN10/PN16 BS4504, BS 10D/E ISO2084, ISO2531 ANSI 125/150, AS2129 ASA125/150 JIS 5K/10K 4) Nominal Diameter: DN50~800. 5) Actuator: Worm Gear 6) The product is 1.6Mpa pressure level, valve body made up ductile iron.