Swing check valve

Abstract

The invention provides a swing check valve. The valve contains a valve body, a valve seat, a valve clack, a rocker, valve clack gaskets, a compression spring A, a valve clack nut, a pin shaft, a valvecover, a lifting ring, a limiting device, gaskets, bolts A, hexagon nuts, a flat screw shaft, a threaded shaft, a flat screw hole, a limiting baffle, compression springs B, bolts B and a limiting base. According to the check valve, the valve clack and the rocker adopt matching between the flat screw shaft on the valve clack and the flat screw hole in the rocker and connection of the threaded shaft on the valve clack and the valve clack nut, so that the valve clack is prevented from rotating around the axis of the valve clack by 360 degrees in the opening and closing processes of the valve andthen a sealing surface is prevented from being damaged; the compression spring A locks the valve clack nut, and thus the looseness, caused by the vibration generated during medium flowing, of the valve clack nut is avoided; and the limiting baffle and the compression springs B are arranged on the limiting device, so that the valve clack is prevented from being impacted to cause deformation and damage. The check valve is compact and firm in the structure, the maintenance is simple and convenient, the leakage of the valve is prevented, the environmental pollution is avoided, and the service life of the check valve is prolonged.

Description

technical field [0001] The invention relates to a check valve, in particular to a swing check valve, which is used in petroleum, chemical industry and other industries. Background technique [0002] Check valve, also known as one-way valve or check valve, is used to prevent the medium in the pipeline from flowing backward. The valve clack and the rocker of the conventional check valve are connected by the threaded shaft on the valve clack and the valve clack nut after the circular shaft on the valve clack is matched with the round hole on the rocker. During the closing process, it will rotate 360 ​​degrees around the axis of the disc, which will easily damage the sealing surface of the disc. The vibration generated during the rotation of the disc and the flow of the medium will easily cause the disc nut to loosen. In view of the above technical problems, in May 2017 On the 28th, Yancheng Stard Minli Valve Co., Ltd. applied for a utility model patent for a swing check valve....

AI Technical Summary

Problems solved by technology

The valve disc and the rocker of the conventional check valve are connected by a threaded shaft on the valve disc and a valve disc nut after matching the round shaft on the valve disc with the round hole on the rocker. During the closing process, it will rotate 360 ​​degrees around the axis of the disc, which will easily damage the sealing surface of the disc. The vibration generated during the rotation of the disc and the flow of the medium will easily cause the disc nut to loosen. In view of the above technical problems, in May 2017 On the 28th, Yancheng Stard Minli Valve Co., Ltd. applied for a utility model patent for a swing check valve. The application number is: 201720652025.9. The limit block in the valve body directly impacts to achieve the purpose of limit. This limit method not only makes the disc easy to deform and damage, but also the surface of the limit block on the inner cavity of the valve is also easy to be worn, and even the limit block is broken. It directly leads to valve leakage and environmental pollution. It is extremely inconvenient to disassemble and maintain the valve in the later stage, which reduces the service life of the check valve. In order to solve the above problems, researchers and technicians in the same industry hope to study through continuous research and exploration. A new type of check valve has been developed. Although some progress has been made in technology, there are still technical problems that have not been overcome in practical application.

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