A low flow check back valve

Abstract

The invention discloses a low-flow preventing return valve, which belongs to the technical field of valve devices. It includes: a cavity is formed inside the valve body, and one end of the valve body is provided with a first through hole communicating with the cavity; the valve cover is connected with the other end of the valve body, and the valve cover is provided with a main passage communicating with the cavity hole; the valve core assembly is arranged in the cavity, and one end of the valve core assembly is connected with the valve cover through the first elastic component, and the valve core assembly can move back and forth along the stretching direction of the first elastic component; wherein the valve core assembly includes a valve disc cover, a valve Disc bracket and valve disc, the valve disc cover is provided with a second through hole through which is communicated with the cavity, one side of the valve disc cover is connected with the valve disc support, and the valve disc support is provided with several through holes communicating with the cavity, The valve clack is arranged in the inner chamber of the valve clack support, and one end of the valve clack is connected with the valve clack support through the second elastic component, and the valve clack can move back and forth along the expansion and contraction direction of the second elastic component. This low flow prevents back valve, small size, good check effect and low resistance.

Description

technical field [0001] The invention relates to the technical field of valve devices, in particular to a low-flow preventing return valve. Background technique [0002] Check valve is also known as check valve, back pressure valve or one-way valve. The main function of check valve is to prevent the medium from flowing backward. The check valve is an automatic valve, which is automatically opened or closed by the thrust of the medium flow in the pipeline. The disc of the opening and closing part of the check valve reciprocates along the central axis of the valve body, and the disc of the check valve can be provided with a spring to realize quick closing. During the long-term use of the existing check valve disc, the sealing pair is subject to long-term wear and tear by the medium, which is prone to the problem of reduced pressure bearing capacity or even damage, resulting in a reduced service life of the valve. The valve disc crosses the valve body, and the fluid can only b...

AI Technical Summary

Problems solved by technology

In order to reduce the flow resistance, the gap between the valve disc and the valve body must be increased. When the diameter of the water hole is fixed, the outer diameter of the valve disc is fixed, which can only be realized by increasing the inner diameter of the valve, which increases the cost and affects the installation.

When the fluid is passed in or cut off, the disc opens / closes non-linearly, and the instantaneous pressure difference between the front of the valve and the back of the valve is large, which will produce a large water hammer effect, which seriously threatens the safety of the pipeline and affects the service life of the pipeline.

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