6) Change the flow direction and improve the service life. The open type flows in the open direction. Cavitation and erosion mainly act on the sealing surface, so that the root of the valve core and the sealing surface of the valve core and valve seat are quickly damaged; The flow closed type flows towards the closed direction. Cavitation and erosion act below the sealing surface of the valve seat after throttling, protecting the sealing surface and the root of the valve core, and extending the service life. When the problem of prolonging the service life of the valve used as a flow to open type is more prominent, the service life can be prolonged by 1~2 times by simply changing the flow direction.

The existing advanced butterfly valve is a tri eccentric metal hard seal butterfly valve. The valve body and valve seat are integral components, and the sealing surface layer of the valve seat is welded with heat-resistant and corrosion resistant alloy materials. The multi-layer soft laminated seal ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has the advantages of high temperature resistance, easy operation, no friction when opening and closing, and compensation sealing with the torque of the transmission mechanism when closing, which improves the sealing performance of the butterfly valve and extends its service life.