Metal hard seal butterfly valve is often said that the hard seal butterfly valve, its sealing on both sides are hard alloy material, belongs to the hard seal form. Because the metal hard seal butterfly valve has high temperature, high pressure environment, resistance to medium erosion and corrosion, long service life and other advantages. It is widely used in petroleum, chemical industry, electric power, environmental protection and other industrial engineering pipelines.
Metal hard seal butterfly valve also has disadvantages, because both sides of the sealing surface are metal material, so in the butterfly valve completely closed, can not completely achieve zero leakage state, there is still a certain amount of leakage, poor sealing performance. So the metal hard seal butterfly valve is usually used in flow regulation.