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Why hard seal butterfly valve will appear the following questions

release date:[2015-07-22]  clicks:

Hard seal butterfly valve use problems

One, due to multi-layer soft fold type sealing ring fixed in the valve plate, when the valve plate normally open state media on the sealing surface to form positive scour, soft sealing strip of metal sandwich after flushing, directly affect the sealing performance.

Second, restricted by structure condition of the structure does not adapt to do below path DN200 valves, because the valve plate structure is too thick, large flow resistance.

Third, because of the principle of triple eccentric structure, between the sealing surface of valve plate and valve seat sealing is to rely on the drive torque valve plate pressure to the valve seat. Is flow state, the higher the medium pressure seal compression tight. When the countercurrent flow medium with the increase of medium pressure valve plate and valve seat unit is less than the pressure medium, the positive pressure between seal began to leak.


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