Working principle of check valve

The check valve is a kind of valve required for water use, mainly to prevent water from flowing in the reverse direction. At the same time, the reverse direction and the release of the container medium may be carried out when it is driven. Therefore, the check valve is designed to prevent this phenomenon. It is opened according to the flow of the medium itself and closed according to the immobility of the medium itself, so it is also an automatic valve.

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• Working principle of check valve

Working principle of check valve

When the valve is opened, the pressure at the inlet end of the check valve must be greater than the weight of the valve disc plus its flow resistance. On the contrary, when the medium returns, the valve will close.

The check valve is usually used as the bottom valve of the pumping device to avoid water backflow. The combination of the check valve and stop valve can play the role of safety isolation. The disadvantages are large resistance and poor sealing when closing.

This type of valve will restrict the flow direction of the medium and can only flow in one direction. This kind of valve can prevent the medium from flowing in the opposite direction to a certain extent. Usually, the valve works automatically. Under the pressure of fluid flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self-closing valve disc of valve disc act on the valve seat, thus cutting off the flow.

The check valve belongs to this type of valve, including the swing check valve and the lift check valve. This mechanism can ensure that in order to ensure that the valve disc can reach the proper position on the seat surface every time, it rests on the inclined seat surface. So that the valve clack has enough swing space and makes the valve clack contact with the valve seat truly and comprehensively. As the valve has certain requirements for performance, the overall structure of the valve disc can be made of metal, or rubber or synthetic coating can be used. When the swing check valve is fully opened, the pressure of the fluid pressure is almost unlimited, so the pressure drop through the valve is relatively small. In addition to the free lifting of the valve disc, the rest of the valve is like the globe valve. Its working principle is to lift the valve disc from the sealing surface of the valve seat through the fluid pressure, and the medium backflow causes the valve disc to fall back to the valve seat and cut off the flow. According to the service conditions, the valve disc can be an all-metal structure, or it can be in the form of an inlaying rubber pad or rubber ring on the valve disc frame.

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