GUOKAI was certified to API,ISO9001-2000 by TUV Rhineland,CE mark of EU PED"H" model,member of China General Machinery Valve Association,member of China Petrochemical Meterials & Resources Market,member of class supply network of China National Petroleum Corporation,designated production enterprise of State Burear of Petroleum and Chemical industry and China National Chemical Equipment Corporation,and our products have been recommended for engineering construction by Ministry of Construction.P.R.China.Supported by robust capacity in development,research,production,inspection and test,as well as the all-around rigorous scientific management system,our products are given reason able structure,exquisite workman ship,complete specifications and depen dable quality,Widely used in the industries of pet rochemical,naturalm,metallurgy,electric power,pharmaceutical,construction and etc.,