... :-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 with the materials of ductile iron ... of GB, ASME, ANSI, API, BS, DIN, JIS etc. warious high quality DN 25 rubber seal butterfly valve