Using U type seal elastic ring and three eccentric multi-level metal seal structure,is widely used in medium temperature less than or equal to 425 DEG C,petroleum chemical industry,metallurgy,electric power and water supplys and drainage and municipal construction and other industrial pipelines,for regulating the flow of fluid and cut off.The three eccentric valve structure,the valve seat and the sealing surface of the steel plate and stainless steel has good corrosion resistance,long service life,the valve has a two-way sealing function,the product conforms to the national standard GB-T13927-92 valve pressure test.