Low-shake low-noise water-hammer-free check valve

Abstract

The invention discloses a low-shake low-noise water-hammer-free check valve which comprises a valve body and a valve cover and further comprises a valve flap and a fixing device. The valve body is provided with a passage formed through front-rear penetration in the inside. The valve cover is detachably installed at the upper end of the valve body. The valve flap is installed in the passage of the valve body. A sealing device provided with a sealing face is arranged at one end of the valve flap, the sealing face of the sealing device can seal the passage of the valve body, and a gravity balancing device is arranged at the other end of the valve flap. A shaft hole is formed in the valve flap, a rotary shaft penetrates through the shaft hole, and the valve flap can rotate around the rotary shaft. The fixing device is located in the cavity of the valve body and fixes the rotary shaft. By using the low-shake low-noise water-hammer-free check valve, water-hammer-free low-shake low-noise operation is achieved through a high-speed starting-stopping function and a low-speed starting-stopping function during starting and stopping. A slow starting and stopping function is achieved without an additional heavy hammer, a hydraulic cylinder or a pneumatic cylinder and other structures, and the using demand under any working condition is met.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a check valve with low vibration, low noise and no water hammer. Background technique [0002] For the medium circulating in the pipeline, in order to prevent the medium from flowing backward, a conventional swing check valve is used, but the conventional swing check valve will cause great vibration and noise and water hammer during the closing process, which will damage the pipeline. The impact is very large, even endangering the safety of pipelines and related equipment. [0003] In order to avoid damage to the pipeline, the slow closing function of the slow closing check valve currently used is mainly realized by external force, one is to add a weight to the rotating shaft of the disc, and the other is to increase the hydraulic cylinder or pneumatic cylinder. [0004] The heavy hammer structure is adopted, which is to add a heavy hammer on the rotating shaft of the valve disc,...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low-vibration, low-noise, water-hammer-free check valve to solve the problem of the decrease in the local strength of the valve body of the slow-closing check valve with an external weight, the increased weight of the valve, and the increased space occupied by the valve; Slow-closing check valves of hydraulic cylinders or pneumatic cylinders are likely to increase the probability of valve leakage, and in high-temperature and high-pressure medium pipelines, the structure of the hydraulic cylinder or pneumatic cylinder of the valve is restricted

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