D373H wafer type butterfly valve makes use of sophisticated J-shaped flexible seal ring and triple eccentric multi-level metal hard seal structure, it is widely used in industrial pipelines in which medium temperature ≤425 ℃, of metallurgy, electric power, petrochemical , as well as water supply and drainage and municipal construction, to adjust flow and cut off fluid. The valve adopts triple eccentric structure, valve seat and disc sealing surface are made of stainless steel and the hardness of them is different. It has good corrosion resistance, long service life, bidirectional sealing function. It complies with national GB / T13927-92 valve pressure test standards.