Slow-closing swing type non-return valve

Abstract

The invention relates to a slow-closing swing type non-return valve. The slow-closing swing type non-return valve is characterized in that the lower end of a rocking bar is fixedly connected with theupper end of a non-return valve flap, the back surface of the non-return valve flap is internally provided with an upper piston cavity, a lower piston cavity and an inclined piston, the inclined piston is of an I-shaped structure, the center of the inclined piston is provided with a guiding hole, the upper end of the inclined piston stretches into the upper piston cavity, the outer circle of the upper end of the inclined piston and the inner wall of the upper piston cavity form one moving seal structure, the lower end of the inclined piston stretches into the lower piston cavity, the outer circle of the lower end of the inclined piston and the inner wall of the lower piston cavity form one moving seal structure, the inclined piston is internally provided with an overflow hole communicatingwith the upper piston cavity and the lower piston cavity, the upper piston cavity and the lower piston cavity are internally provided with buffer liquid correspondingly, the inner cavity of a valve seat is provided with a strengthening tibia, a chamber is further internally provided with a guiding rod, one end of the guiding rod is fixedly arranged at the strengthening tibia, the other end of theguiding rod obliquely upward stretches to an outlet flow passage, and the outer circle of the guiding rod and the inner wall of the guiding hole form one moving seal structure. The slow-closing swingtype non-return valve has the advantages that a sealing surface is prevented from damage by impact, forming of a water hammer is prevented, and the service life is long.

Description

technical field [0001] The invention relates to a check valve, in particular to a slow-closing swing check valve. Background technique [0002] The check valve is a commonly used valve in the pipeline system, which is mainly installed at the outlet of the pump, and it 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. The pin shaft is installed in the inner cavity of the valve. When the medium enters the inner cavity of the valve from the inlet side of the valve, the medium pushes the check valve disc to rotate around the pin shaft to open. When no medium enters the valve inlet side, the check valve disc rotates around the pin shaft. closure. Its disadvantages are: in the process of rotating and closing the check valve disc around the pin shaft, the closing speed is prone to be too fast, resulting in excessive impact force on the sealing surface of the valve disc ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: in the process of rotating and closing the check valve disc around the pin shaft, the closing speed is prone to be too fast, resulting in excessive impact force on the sealing surface of the valve disc and the sealing surface of the valve seat, which is easy to be damaged; at the same time, the check valve disc When closing quickly, it is easy to generate water hammer, which leads to the occurrence of harmful situations such as valve damage

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