Wafer soft seal butterfly valve characteristics

New features and butterfly valve in the course of a problem :
Currently, soft seal butterfly valve as a piping system used to achieve off and flow control components, has been in the petroleum, chemical, metallurgy, water and electricity , and many other fields has been very widely used . In the well-known butterfly valve technology , the sealing forms enclosed structure, sealing material for rubber , PTFE and so on. Restrictions due to structural features , suited high temperature, high pressure and corrosion resistance, abrasion resistance and other industries. Present a more advanced butterfly valve is a three eccentricity metal hard luggage seals butterfly valve, valve and seat components for the piece , seat sealing surface layer welding temperature, corrosion resistant alloys. Multilayer soft stacked ring fixed to the valve plate, this butterfly valve in comparison with the conventional high temperature , easy operation, open and close without friction, closed with the transmission of the torque increases to compensate for sealing , improved valve sealing performance and durability advantages .
One , as soft and hard stacked ring fixed in the valve plate, when the valve plate normally open state media, the formation of a positive sealing surface erosion, metal sheets laminated in soft sealing tape subject to erosion , direct impact on seal performance.
Second, by the structural constraints of the structure do not meet the following diameter DN200 valves, because the overall structure of the valve plate is too thick, large flow resistance .
Third, because the principle of three eccentric structure , the sealing surface of the valve plate seal between the valve seat is on the transmission of torque to the valve plate is pressed against the valve seat . Positive flow state, the higher the pressure medium sealed tight squeeze . When the flow channel upstream medium with media pressure valve plate and valve seat pressure between the units is less than the medium pressure, the security stickers started to leak .