An ISO9001:2000(DNV), API-6D, CE, CQC, ISO4001 approved valves manufacturer and exporter, Gaoneng (HPV is our registered top brand), since we established in 1985, with long history, specialized experience, advanced manufacturing equipment and test devices, strong capacities, and is now one of China’s leading and main valve manufacturer and supplier, engaged in design, develop, manufacture and sales various industrial valves and pipe fittings, serving to oil, chemical, petrochemical