Check valve

Abstract

The invention provides a check valve. The check valve is characterized by comprising a valve body assembly, an electromagnetic assembly and a diversion assembly, wherein the valve body assembly is provided with a valve flap, a valve seat, a connecting pipe and a push rod, the valve flap is shaped like an inverted trapezoid, and the lower end of the push rod is connected with the upper end of the valve flap; the outer wall of the electromagnetic assembly is connected with the connecting pipe, and a coil, a movable iron core and a spring are arranged in the outer wall of the electromagnetic assembly; a sliding block is arranged in a diversion pipeline of the diversion assembly, conductive blocks are arranged on the sliding block, two conductive contact points are arranged in the diversion pipeline, and the conductive blocks enable the two conductive contact points to be connected or disconnected; and the two conductive contact points are connected with the coil, a power supply and a circuit switch in series. According to the check valve, the valve flap can be completely pulled out of a medium between a valve body inlet and a valve body outlet, so that when the check valve is connected, the pressure and the flow of the medium cannot be affected, and the check valve can be used for the situation with large flow; and meanwhile, the impact of the medium to the valve flap and abrasionbetween the valve flap and a valve body are reduced, and the service life of the check valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a check valve. Background technique [0002] At present, the commonly used check valves are swing check valve (rotating according to the center of gravity) and lift check valve (moving along the axis), but due to the existence of the valve disc or the valve core, when the medium passes through the check valve, the pressure The drop is serious, and the flow rate is reduced; and because the movement of the valve disc or the valve core directly depends on the pressure difference between the two sides of the medium, there is too much impact on the valve disc or the valve core, which reduces the service life of the check valve. Back valve (moving along the axis) has a large projection surface of the medium in the moving direction of the valve, so the pressure of the medium that the valve needs to overcome during the movement is also large. Contents of the invention [0003] In order...

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Problems solved by technology

[0002] At present, the commonly used check valves are swing check valve (rotating according to the center of gravity) and lift check valve (moving along the axis), but due to the existence of the valve disc or the valve core, when the medium passes through the check valve, the pressure The drop is serious, and the flow rate is reduced; and because the movement of the valve disc or the valve core directly depends on the pressure difference between the two sides of the medium, there is too much impact on the valve disc or the valve core, which reduces the service life of the check valve. Return valve (moving along the axis) Since the projection surface of the medium in the moving direction of the valve is large, the pressure of the medium that the valve needs to overcome during the movement is also large

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