Eighth, if the valve is cleaned, it is recommended that non-metallic parts should not be soaked for a long time. After cleaning, they should be taken out of the cleaning agent. At the same time, they can be assembled only after the cleaning agent volatilizes from the washed wall. They should not be left aside for a long time, which is likely to rust; Ninth, when lubricant is used for lubrication, it should be compatible with other media such as metal wipers, rubber parts, plastic parts, etc. For example, the surface of the seal installation groove needs to be coated with a layer of grease, and the sealing surface and friction surface of the valve rod also need to be lubricated; 　　

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.