A swing check valve

Abstract

The invention discloses a swing check valve, which comprises a valve body, a valve chamber is arranged in the valve body, and an inlet pipe and an outlet pipe communicated with the valve chamber are arranged on the side of the valve body; A valve cover is fixedly installed at the opening of the upper end, and it is characterized in that, the left side wall of the valve cavity is provided with two struts above the inlet pipe, and a horizontal sill is arranged between the two struts along the axial direction perpendicular to the inlet pipe. Shaft, the shaft is rotatably connected with a shaft sleeve, the outside of the shaft sleeve is extended with a rocker, and the rocker is fixedly installed with a valve disc for controlling the on-off of the inlet pipe at the end far away from the support rod; The left side wall of the valve cavity is slidably connected with a pressure block along the axial direction of the shaft rod under the strut, and the front side wall of the valve cavity is provided with a rear side wall for forcing the pressure block to the valve cavity at one end of the pressure block. The elastic part that moves in the same direction, and the transmission assembly connected to the shaft sleeve is arranged inside the pressure block; the swing check valve is not only reasonable in structure, reliable in use, the disc can be opened quickly and closed slowly, and is shock-resistant.

Description

technical field [0001] The invention belongs to the technical field of pipeline valves, in particular to a swing check valve. Background technique [0002] The check valve is a valve commonly used in the pipeline system, which is used to connect and check the fluid medium in the pipeline system. The existing swing check valve mainly includes a valve body, a valve seat and a check disc. And it is installed in the inner cavity of the valve by the pin shaft. When the medium enters the inner cavity of the valve from the inlet side of the valve (the medium flows forward), the medium pushes the check valve disc to rotate around the pin shaft to open. When the medium enters the inner cavity of the valve from the outlet side of the valve When (the medium flows in the opposite direction), the check disc rotates around the pin to close the valve port. The following problems often occur during the use of existing swing check valves: when the check valve disc rotates around the pin sh...

AI Technical Summary

Problems solved by technology

The following problems often occur during the use of existing swing check valves: when the check valve disc rotates around the pin shaft and closes, due to the fast closing speed, the impact of the disc sealing surface on the sealing surface of the valve seat will occur. If the force is too large, it is easy to damage the sealing surface, so that the check valve cannot be effectively closed, and the service life is reduced; at the same time, when the check valve disc is closed quickly, it is easy to generate water hammer, resulting in damage to the valve and other harmful situations.

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