Check valve with operation device

Abstract

The invention discloses a check valve with an operation device, and belongs to the technical field of valves. The check valve comprises a valve body and a valve bonnet, wherein the valve body and thevalve bonnet are connected through bolts, an inflow channel and an outflow channel are formed in the valve body, and the end part of the inflow channel and the end part of the outflow channel are eachprovided with a flange plate; a valve shaft is arranged in the valve body, a rocking bar is connected to the valve shaft, two springs are arranged on the rocking bar, and the other ends of the springs are fixedly connected to the outflow channel; the rocking bar is connected with a valve disc through a positioning pin, a sealing ring A is arranged at the joint of the valve disc and the valve body, and the valve disc is matched with the outflow channel; an external connection pipe is arranged at the bottom of the inflow channel, a lower cover is arranged at the bottom end of the external connection pipe, a clamping ring and a filter element are arranged in the inflow channel, and the other end of the filter element extends into the external connection pipe to be fixedly connected with thelower cover; and a support is connected to the valve bonnet, a turntable is arranged on the support, the turntable is in threaded connection with a valve rod, the valve rod penetrates through the valve bonnet and the support, a mechanical seal ring is arranged at the position where the valve rod is matched with the valve bonnet, the valve rod downwards presses the rocking bar, and the turntable meshes with a hand wheel.

Description

technical field [0001] The invention belongs to the technical field of valves, in particular to a one-way valve with an operating device. 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, also known as check valve, one-way valve, and reverse flow valve. The check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. Normally, fluid under pressure opens the disc of the check valve and flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes the channel under the action of fluid pressure and its own gravity to prevent the fluid from flowing backward. However, the existing check valve has a large impact when ...

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Problems solved by technology

[0004] When the backflow of the patented check valve is closed, the disc drives the disc shaft to rotate counterclockwise around the axis of the disc shaft, thereby driving the lever to rotate counterclockwise around the axis of the disc shaft. When the lever rotates, it can drive the piston rod of the cylinder toward The movement of the cylinder, under the action of the cylinder and the weight, the rotation speed of the disc shaft decreases, and the slow closing of the check valve is realized, which reduces the impact and noise, but the solid particles contained in the fluid will gather on the valve seat, making When the valve is closed, due to the gap between the valve core and the valve seat, it is not closed tightly, which cannot effectively prevent the medium from flowing backward, and under special working conditions, it cannot achieve positive closing

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