Four eccentric two-way sealing butterfly valve

Abstract

The invention belongs to the field of fluid control valves and relates to a valve body which can achieve double-way sealing, in particular to a four-eccentricity double-way sealing butterfly valve. The four-eccentricity double-way sealing butterfly valve comprises a valve body, a valve plate, a valve rod and a sealing ring, the valve plate is mounted in the valve body, the valve rod is rotatably arranged in a shaft hole of the valve body, the valve plate is fixedly connected with the valve rod through a pin, and thereby, synchronous rotation of the valve plate and the valve rod can be achieved; a packing assembly, a packing gland and a packing pressure plate are sequentially arranged at a position of a packing box of the valve body and fixed and sealed through lock nuts and screws; a gasket, the sealing ring and a pressure ring are sequentially mounted on the valve plate and locked and fixed through hexagon bolts; a boss is arranged at two ends of a shaft shell of the valve plate respectively, and groove stands which are matched with the bosses are disposed in an inner cavity of the valve body. By means of the four-eccentricity double-way sealing butterfly valve, double-way sealing, good abrasive resistance, small required torque and long service life can be achieved, and stable and safe operation of devices can be guaranteed.

Description

technical field [0001] The invention belongs to the field of fluid control valves, and relates to a valve body capable of realizing bidirectional sealing, in particular to a four-eccentric bidirectional sealing butterfly valve. Background technique [0002] As is well known, the body of a butterfly valve is usually a cylindrical member that allows fluid to flow through it. It is characterized in that the valve plate is provided with a sealing surface, and when in motion, the valve plate rotates around the valve shaft, and during the action, the sealing surface on the valve plate is close to or separated from the sealing surface of the valve seat provided on the valve body. So as to realize the closing or opening function. [0003] Butterfly valves mainly include central butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves and triple eccentric butterfly valves. The evolution process of the eccentric structure of the butterfly valve is aimed...

AI Technical Summary

Problems solved by technology

According to the geometric relationship between the three eccentricities, it is known that the sealing point away from the center of the valve shaft has a relatively large change rate with the valve opening, while the sealing point close to the center of the valve shaft has a small change rate with the valve opening. The rate of change of the surrounding sealing points is inconsistent, which leads to the problem of uneven force and deformation around the sealing ring. Under the action of the valve stem torque, the sealing force and the generated stress around the sealing ring are not equal, resulting in high pressure. zone and low pressure zone, resulting in inconsistent deformation around the seal ring

This inconsistent deformation along the periphery of the sealing ring cannot realize the two-way sealing of the valve, and also affects the sealing effect and service life of the valve.

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