since its opening and closing speed, good sealing, light weight, so very popular. Widely used in medium and low pressure large, medium caliber. Especially in recent years, the three dimensional partial hardness sealing butterfly valve has greatly increased the working temperature. But butterfly valve has two major problems: one is because of the radial runout of the stem and sealing surface friction, makes the valve opening and closing torque is very large. Second, due to compression of butterfly plate, due to the clearance between the valve stem and valve body and disc and stem the disturbance of deformation, from stem side into the medium, the butterfly plate sealed performance is good, so when entering cannot meet the sealing requirements. Medium in the opposite direction. Traditionally known as a one-way seal, it is not only such as two-way sealing ball valve, gate valve, valve, in many cases can't meet the needs of users, and, more importantly, do not conform to the requirements of the standard. 'GB/T13927 regulation, the butterfly valve should be introduced in the most unfavorable to seal in the direction of the medium and pressure. Symmetrical valve butterfly valve can be pressurized in any direction. Visible, according to the provisions of the GB/T13927 only one-way seal butterfly valve is not qualified.

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