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.

(4) The sealing of the valve stem is also more reliable, because the valve stem does not move up and down, but only moves as if it were rotating. Everyone is also worried about the packing of the valve stem, and the sealing will also increase with the rise of the medium pressure;