Zhengzhou city zhengdie valve CO., ltd (ZD VALVE) is one subsidiaries of China Valve Tecnology.China Valves Technology is a leading developer, manufacturer and after market service provider of comprehensive flow management products and services in China.Our flow service solutions help customer to resolve any problems and questions in critial industries around the world China Valves Technology goes through the internal resources optimization and external expansion of mergers and acquisitions to integration of China valve industry, try to become one of the leading valve manufacturer and provider of the world.In December 2009, China Valves Technology was successfully listed on NASDAQ(Stock symbol:CVVT), and it became the first Chinese valve company which listed in the United States stock market. ZD VALVE is a national patent sample enterprise, science and technology innovation enterprise. ZD is member of China Water Association, China Valve Association and China Quality Association. ZD is a special manufacturer of middle and low pressure butterfly valve and special type valve, and also of the main manufacturing base of large size butterfly valve in China. We acquired National ISO9001 Quality System Certificate in 1997, Manufacturing License Certificate of Special Equipment issued by National Quality Inspection Bureau in 2000, DNV-ISO9001 Quality System Certificate in June, 2001, API 6D Product Quality Certificate in August, 2001, PED97/23/EC Product Quality Certificate in November, 2002, Sanitation License Certificate for the product related to drinking water sanitation and safety issued by Henan Province Sanitation Office in 2002, WRAS Drinking Water Certificate in 2006, ISO14001 International Environment System Certificate in 2007. We have the license to export and import. Now our company has been a famous enterprise in China Valve industry.