... in industries such as water source projects, urban water supply and drainage, sewage treatment, electric power, petroleum, petrochemical, heat supply, ... :Suitalbe for handles(dn50~300), gear operators, electric and pneumatic control actrators.Products;We can produce butterfly valves, ... are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN Casting iron DN1200 ...