Slow-closed rotary-opened type check valve capable of preventing water hammer

Abstract

The invention discloses a slow-closed rotary-opened type check valve capable of preventing waterproof hammer. The slow-closed rotary-opened type check valve is characterized in that an umbrella-shaped slow-closed device is further arranged between the back of a valve clack and a support. The umbrella-shaped slow-closed device comprises an elastic buffering device, an inner umbrella and an outer umbrella, wherein the inner umbrella and the outer umbrella are of disk-shaped structures, an overflowing hole is formed in the outer umbrella, an outer umbrella inner spherical face is arranged on the outer umbrella, the outer umbrella is fixedly arranged on a valve clack shaft, an inner umbrella outer spherical face and an inner umbrella inner spherical face are arranged on the inner umbrella, a guiding hole is formed in the inner umbrella, the guiding hole and the valve clack shaft are in axial movable fit, one end of the elastic buffering device is connected with the back of the valve clack, the other end of the elastic buffering device is connected with the inner umbrella inner spherical face, and the outer umbrella inner spherical face is tightly pressed by the inner umbrella outer spherical face. When the medium pressure on the inlet side of the valve is closed suddenly, the valve clack is slowly closed in a rotary mode. A sealing face is prevented from being damaged, water hammer is prevented from being generated, and the service life is long.

Description

technical field [0001] The invention relates to an improved invention of a valve, in particular to an improved invention of a waterproof hammer slow-closing swing check valve. Background technique [0002] The check valve is a commonly used valve in the pipeline system, which is mainly installed at the outlet of the pump, and it is used to connect and check the fluid medium in the pipeline system. The existing swing check valve mainly includes a valve body, a valve seat and a valve disc. The valve seat is provided with a valve seat sealing surface and is fixed in the flow channel of the valve body. In the inner cavity of the valve, when the medium enters the inner cavity of the valve from the inlet side of the valve, the medium pushes the disc to rotate around the pin to open, and when no medium enters from the inlet side of the valve, the disc rotates around the pin to close. Its disadvantages are: when the disc rotates and closes around the pin shaft, it is easy to close ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: when the disc rotates and closes around the pin shaft, it is easy to cause the closing speed to be too fast, resulting in excessive impact force on the sealing surface of the disc sealing surface, which is easy to be damaged; at the same time, when the disc is closed quickly , prone to water hammer, resulting in damage to the valve and other hazardous situations

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