... foodstuff, oil etc.Working Temperature:-10°C~150°COperator:Suitalbe for handles(dn50~300), gear operators, electric and pneumatic control ... valves, check 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 etc. various high quality Butterfly valve