Check valve of hydraulic pump

Check valve (also known as check valve), through the flow of the media itself to achieve automatic opening and closing valve clack, mainly used for medium reflux, is an automatic valve, also known as check valve, one-way valve, counter flow valve, and back pressure valve. To avoid the pump and driving motor switch, and the leak and release the container medium.

The check valve can also be used to supply piping on the auxiliary system where the pressure may rise above the system pressure. The check valve can be mainly divided into rotary check valve (rotating according to the center of gravity) and lifting check valve (moving along the axis).

Under the pressure of the same direction fluid, the valve opens; when the fluid moves reversely, the fluid pressure and the valve self weight valve plate act on the valve seat, and the flow will be cut off.

The inner screw check valve and butterfly check valve belong to this type of valve, which include swing check valve and lift check valve. The swing check valve has a hinge mechanism, and a valve like door is free to lean against the inclined seat surface.

In order to ensure that the valve can reach the appropriate position of the valve seat each time, the valve is designed in the hinge mechanism, so that the valve has enough swing space, and make the valve true and comprehensive contact with the valve seat. The valve can be made of either metal or leather, rubber, or synthetic coverage, depending on the performance requirements.

The swing check valve is completely open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The check valve of the lift check valve is located on the sealing surface of the valve seat.

In addition to the valve can freely lift the valve, the rest of the same as the cut-off valve, the fluid pressure to make the valve from the seat sealing surface lift, media backflow leading to the valve flap back to the seat, and cut off the flow. According to the operating conditions, the valve can be all metal structure, or can be mounted on the valve frame rubber pad or rubber ring form.

Like the globe valve, the passage of the fluid through the lift check valve is also narrow, so the pressure drop of the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is limited.

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