However, this butterfly valve is still in the course of the following problems:
Due to soft and hard stacked multi-ring fixed to the valve plate, when the valve plate to its normal open state media, the formation of a positive sealing surface erosion, and metal sheets laminated in the soft-sealing tape subject to erosion, the direct impact on seal performance.
Third, because the principle of the three eccentric structure, the valve plate sealing surface and the seal between the valve seat is to rely on the torque transmission device so that pressure valve plate to the valve seat. Positive flow state, the media, the higher the pressure squeezed more tightly sealed. When the flow channel upstream medium with medium pressure increases when the valve plate and seat the pressure between the units is less than the medium pressure, the seal started to leak out.

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