... valve a.Ozone and chemical resistance b.High temperature resistance c. Excellent weather and water resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design StandardAPI ... :Water, sewage,sea water, air, foodstuff, oil etc.Working Temperature:-10°C~150°COperator:Suitalbe for handles(dn50~300), gear ... GB, ASME, ANSI, API, BS, DIN, JIS etc. various high quality Double Flange Butterfly valve