... of Rubber Seal a.Ozone and chemical resistance b.High temperature resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design StandardAPI 609End flangeEN1092 ,ANSI ... Medium:Water, sewage,sea water, air, foodstuff, oil etc.Working Temperature:-10°C~150°COperator:Suitalbe for handles(dn50~300), gear ...