... water source projects, urban water supply and drainage, sewage treatment, electric power, petroleum, petrochemical, heat supply, shipbuilding, medicine and metallurgy ... for handles(dn50~300), gear operators, electric and pneumatic control actrators.Products;We can produce butterfly valves, check valves, gate valves and ... the standards of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve