Butterfly valve with two-way sealing function

Abstract

The invention discloses a butterfly valve with the both-way sealing function. According to the technical scheme, the butterfly valve is characterized in that an inclination part is arranged on the inner wall of a valve seat, and the inclination part surrounds the inner wall of the valve seat; an opening in the side, opposite to a liquid inlet, of the valve seat is larger than an opening of the other side; a sealing ring is in line contact with the inclination part. On one hand, the inclination part is arranged on the inner wall of the valve seat and surrounds the inner wall of the valve seat, and therefore when the butterfly valve is used, the function of well blocking the sealing ring can be achieved when the butterfly valve is subjected to medium forward direction acting force, and the sealing ring is pressurized and can make better close contact with the inclination part on the valve seat; on the other hand, the sealing ring is in line contact with the inclination part on the valve seat, and when the butterfly valve is closed, the butterfly valve is in the optimal line contact sealing all the time; the sealing ring can be automatically offset in the axial direction and the radial direction, the insufficiency of the medium reverse acting sealing force is overcome, and both-way sealing is reliable.

Description

technical field [0001] The invention relates to the field of valves, more specifically, it relates to a butterfly valve with bidirectional sealing function. Background technique [0002] Valves are the control components in the fluid conveying system. They have the functions of cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves, ball valves and butterfly valves, etc., are widely used in natural gas long-distance pipelines, metallurgy, hydropower, thermal power, urban water supply and drainage, farmland drainage and irrigation and other industries, and are suitable for natural gas, coal gas, steam, air, water, etc. In the pipeline system, it is used to cut off or connect the medium. The butterfly valve mainly includes a valve body, a valve seat and a valve stem. The opening and closing of the body. [0003] At present, the butterfly valves on the market basically realize the sealing effect...

AI Technical Summary

Problems solved by technology

[0003] At present, the butterfly valves on the market basically realize the sealing effect through the sealing ring on the butterfly plate. In this way, the sealing ring is prone to position shift or even drop due to the pressure of the medium during use, which will affect the sealing effect. Butterfly valves set the inner wall of the valve seat to be inclined on one side, so as to avoid the position of the sealing ring from shifting or falling off when it is subjected to the positive force of the medium, and the sealing ring is stressed to increase the sealing performance, but this can only play a role. One-way good sealing effect, when the butterfly plate is turned to close the valve body, there is likely to be a reverse force of the medium, and the general butterfly valve directly affects the sealing performance of the sealing ring when the reverse force is applied, so that the sealing ring cannot be tightly connected to the inner wall of the valve seat Conflict, and then there will be medium backflow, and a good two-way sealing effect cannot be achieved, which needs further improvement

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