... valve a.Ozone and chemical resistance b.High temperature resistance c. Excellent weather and water resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design ... supply, shipbuilding, medicine and metallurgy industries.Suitable Medium:Water, sewage,sea water, air, foodstuff, oil etc.Working Temperature:-10°C ... , ASME, ANSI, API, BS, DIN, JIS etc. various high quality Double Flange Butterfly valve