Check valve

Abstract

The invention provides an improved check valve. The improved check valve comprises a check valve body. The improved check valve is characterized by comprising an outer shell, a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are located in the two ends of the outer shell; the outer shell is provided with a cavity which is internally provided with stopping pieces surrounding the cross section of the cavity; the cavity is further and internally provided with a non-return sealing piece, the inner diameter of the stopping pieces is larger than the outer diameter of the non-return sealing piece, and a sealing structure can be formed when the stopping pieces and the non-return sealing piece get close to one another; the non-return sealing piece is connected with a spring, and the elastic direction of the spring faces the liquid inlet. Additional resistance cannot be generated by the check valve, water hammering is prevented, exterior abrasion of adjacent objects in a pipeline system can be prevented, and connector fracture is prevented.

Description

technical field [0001] The invention relates to the field of piping systems, in particular to a check valve. 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. There is a certain inertia in the piping system or stand-alone piping when the existing check valve closes due to the pump shutting off. When the pump is off, the flow of liquid continues for a relatively long period of time in the direction of flow of the pumped liquid due to the inertia and the valve member being controlled by the flow of liquid. When the flow of liquid stops the valve member is at a distance from the valve seat and before the valve member manages to close the check valve the flow of liquid is reversed and the flow of liquid acquires a velocity towards the pump. Therefore, the entire volume of liquid that exists in the piping between the pump and the check valve and between the pump and the sum...

AI Technical Summary

Problems solved by technology

Therefore, this phenomenon will produce large pressure changes, while even small pressure changes are enough to fatigue the pipes, cause external wear of the pipes against adjacent objects due to movement in the pipe system, and cause the pipes to wear out due to the sluggishness of the check valves. Enough to blow the pipe inward and rupture the joint

The pressure of the fluid acts on the check valve, and when it is opened and closed, it will generate loud noise, wear and damage of the valve structure

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