Butterfly Valve of Rubber Seal a.Ozone and chemical resistance b.High ... water, air, foodstuff, oil etc.Working Temperature:-10°C~150°COperator:Suitalbe for handles(dn50~300), gear operators ... valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless steel to order ... are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS ...