... , sewage,sea water, air, foodstuff, oil etc.Working Temperature:-10°C~150°COperator:Suitalbe for handles(dn50~300), gear operators, electric ... and pneumatic control actrators.Products;We can produce butterfly valves, check valves, gate valves and so on ... of GB, ASME, ANSI, API, BS, DIN, JIS etc. warious high quality DN 25 rubber seal butterfly valve