The use of sophisticated J-shaped elastic ring and three eccentric multi-level metal seal structure, is widely used in medium temperature ≤425 ℃ of metallurgy, electric power, petrochemical, as well as drainage and municipal construction and other industrial pipe, for regulating the flow and carrier off fluid use. The valve adopts three eccentric structure, seat and disc sealing surface are made of stainless steel with different hardness and has good corrosion resistance, long life, this two-way valve seal military postal functions, products, in line with national GB / T13927-92 pressure test standards. Features: This valve adopts three eccentric seal structure, seat and disc almost no wear, with the view of the tight sealing function. 2, ring made of stainless steel production, with a metal seal and elastic sealing of the dual advantages, both in the case of low and high temperatures, all with excellent sealing performance, corrosion resistance and long service life. 3, the disc plate sealing surface using cobalt-based alloy welding, sealing surface wear resistance and long service life. 4, large-sized disc using lattice structure, high strength, flow area, flow resistance. 5, the valve has a two-way sealing function, the installation of unrestricted flow of media, is not affected by spatial location can be installed in any direction. 6, the drive can be multi-position (rotated 90 ° or 180 °) to install, easy to use