The triple-eccentric multi-level metal hard-sealed butterfly valve is widely used in metallurgical, electric power, petrochemical, water supply and drainage, and municipal construction and other industrial pipelines with a medium temperature of 425 ℃ or less to adjust the flow rate and load and cut off the fluid. The butterfly valve adopts a triple eccentric structure. The valve seat and the sealing surface of the disc plate are made of stainless steel with different hardness. It has good corrosion resistance and long service life. This valve has multi-level sealing function. The product conforms to the national GB/T13927-92 valve pressure. Test Standard.