The traditional metal hard seal butterfly valve is used to realize the on-off and flow control components of the pipeline system, and it is extremely widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. In the known butterfly valve technology, the sealing form is a sealing structure, and the sealing material is rubber or polytetrafluoroethylene. But defects are the cause of structural features. Not in high temperature, high pressure, and corrosive industries.
The relatively new type of butterfly valve is a three-eccentric metal hard-sealed butterfly valve, the valve body and the base are in a conjoined structure, and the sealing surface of the valve seat is welded with temperature-resistant and corrosion-resistant alloy materials. The multi-layer sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, it is more resistant to high temperature and pressure, and it is easy to operate. There is no friction between opening and closing. When closing, the torque of the transmission mechanism increases. Great to compensate the sealing, enhance the sealing performance of the butterfly valve and prolong the service life.