Swing check valve with long service life

Abstract

The invention discloses a swing check valve with a long service life. The swing check valve with the long service life comprises a valve body, a valve cavity is formed in the valve body, and an inletpipe and an outlet pipe which communicate with the valve cavity are arranged on the side face of the valve body; a valve cover is fixedly installed at an opening in the upper end of the valve cavity,an annular valve seat is arranged at the position, in the valve cavity, of the inlet pipe, a valve rod is hinged to the position, above the annular valve seat, of the inner side wall of the valve cavity, a valve clack is arranged on the valve rod, and a sealing gasket used for being pressed on the annular valve seat is arranged on the valve clack; and the valve rod is connected with a sheath platein a sliding mode in the length direction of the valve rod, the valve clack is sleeved with the sheath plate, a power groove inclining downwards is formed in the inner side wall of the valve cavity,and a protruding column stretching into the power groove is arranged on the sheath plate. When the annular valve seat is completely opened by the valve clack, the sealing gasket is completely coveredby the sheath plate; and the check valve is simple in structure, and the valve clack can be protected while the valve clack is cleaned when the check valve is opened.

Description

technical field [0001] The invention belongs to the technical field of pipeline valves, and in particular relates to a long-service life swing check valve. Background technique [0002] Check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium. According to different structures, the common check valves at present include lift check valves, swing check valves and butterfly check valves. The swing check valve includes a valve body, a valve seat, a valve disc, a rocker and a fixed shaft. When the fluid in the body is still or the fluid is flowing backwards, the valve disc falls under the impact of its own gravity and fluid, and the valve disc covers the valve seat, thereby realizing the interception of the upstream fluid channel and the downstream fluid channel, and the fluid flows backward. When the fluid in the valve body flows from the upstream fluid channel to the downstream ...

AI Technical Summary

Problems solved by technology

[0003] 1. In the process of rotating and closing the check valve disc around the pin shaft, the closing speed is too fast, which causes the impact force of the valve disc sealing surface to be too large and easy to be damaged; at the same time, the check valve disc is rapidly When it is closed, it is easy to generate water hammer, which will lead to the occurrence of harmful situations such as valve damage;

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