... Ozone and chemical resistance b.High temperature resistance c. Excellent weather and water resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design StandardAPI 609End ... and pneumatic control actrators.Products;We can produce butterfly valves, check valves, gate valves and so on with the materials of ... of GB, ASME, ANSI, API, BS, DIN, JIS etc. various high quality Double Flange Butterfly valve