Compared with the traditional butterfly valve, the metal hard seal butterfly valve has the advantages of high temperature resistance, light operation, non-friction opening and closing, and compensation sealing with the increase of the torque of the transmission mechanism when closed, which improves the sealing performance of the butterfly valve and extends the service life.

As a component used to realize the on-off and flow control of pipeline system, metal hard sealed butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the well-known butterfly valve technology, the sealing form is mostly sealed structure, and the sealing material is rubber, polytetrafluoroethylene, etc. Due to the limitations of structural characteristics, it is not suitable for high temperature, high pressure, corrosion resistance, wear resistance and other industries.