A swing check valve

Abstract

The invention discloses a swing check valve, and belongs to the technical field of design of water valves. The swing check valve comprises a valve body, a valve clack, a connecting rod, a bolt, a nut, a cotter pin, a cylindrical pin, a cover plate, stand columns and a fixing pin. The connecting rod is connected into a pipeline of the valve body. The valve clack and the connecting rod are connected through the bolt. The right end of the bolt is screwed into the nut. The cotter pin is arranged on the portion, located at the right end of the nut, of the bolt so that the situation that the nut falls from the right end of the bolt after getting loose can be effectively prevented. The connecting rod and the valve clack are connected reliably, the top of the valve body is covered with the cover plate, and the valve body and the cover plate are fixedly connected through the bolt. According to the swing check valve disclosed by the invention, unidirectional circulation of water flow can be achieved conveniently, the connecting rod and the valve clack can flexibly rotate relative to the valve body, the connecting rod and the valve body are connected reliably, and the structure is simple; and the two stand columns are arranged on the portion, located on the right side of the fixing pin, of the bottom surface of the cover plate, so that the situation that the valve clack and the connecting rod collide with the valve body under the impact of the water flow is prevented, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of water valve design, in particular to a swing check valve. Background technique [0002] Swing check valve is also called one-way valve or check valve. Its function is to prevent the medium in the pipeline from flowing back. Return valve, most of the check valve seats on the market collide with the valve body when it is closed, which can easily cause the inner wall of the valve to be easily damaged, and some valve bodies are also equipped with cushions and gaskets on the valve seat. , but this kind of material tends to swell after long-term contact with liquid, which often leads to a great decrease in the sealing performance of its cushion and gasket. In addition, the connection between the check valve and the valve body is currently mostly used in Drill holes on the valve body, and then connect the check valve and the valve body through pins. Due to the problem of the drilling accuracy of the valve body,...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects that the seat of most check valves on the market is easy to be damaged and the check valve is not closed tightly, and a swing check valve is designed. Flexible rotation, reliable connection between connecting rod and valve body, simple structure and long service life

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