Zhengzhou City Zhengdie Valve Co.,Ltd (ZD Valve), a member of China Valves Technology Inc. is specialized in developing and manufacturing low and middle pressure butterfly valve, ball valve, tilting disc check valve, and valves in special design, and also of the main manufacturing base of large size butterfly valve in China. ZD is member of: -- China Valve Association -- China Water Association -- Henan Quality Association We have: DNV-ISO9001 certificate DNV-ISO14001 ...   |