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Check valve function and working principle diagram
Source: | Author:Xinsy WZ | Publish time: 355 days ago | 288 Views | Share:
The check valve is an automatic opening and closing valve that does not require manpower or other action

The role of the check valve:


The check valve is an automatic opening and closing valve that does not require manpower or other action. It relies on the flow of the pipe medium itself to open or close the valve. It is mainly used to prevent the reverse flow control of the pipe medium and is also regarded as a check valve. Or counterflow valve. The check valve has only one flow direction, that is, it can only flow backward along the water inlet, and the valve flap is closed when the medium is reversed. Check valves are typically installed where the backflow of the media is prevented when the valve is not closed. A check valve is installed at the outlet of a common water pump to prevent high pressure water from flowing backwards into the water pump, causing the pump impeller or other components to loosen or be damaged by hydraulic impact, resulting in an accident. In summary, check valves are used on pipes or equipment that prevent backflow of media.


Check valve principle dynamic diagramCheck valve principle dynamic diagram


The principle of the check valve is very simple. As shown in the figure, the medium flows in a specified direction. When the flow pressure exceeds the opening pressure of the check valve, the valve flap is opened under the action of the fluid pressure, thereby opening the pipe medium. Circulation. Conversely, when the pipe medium is reversed, the valve flap is pressed against the check valve body under the pressure of the fluid pressure, and the valve is closed, thereby cutting off the flow of the pipe medium. Moreover, the greater the pressure of the backflow medium, the tighter the valve flap is closed, and the better the sealing effect, completely eliminating the possibility of medium backflow.

Check valve structurecheck valve structure diagram


According to the different structural forms, the check valve can be divided into three types: lift type, swing type and butterfly type. The lift type can be divided into vertical type and horizontal type. The action mode is to move along the axis. The swing type can be divided into a single flap type, a double flap type and a multi-lobed type, and their working mode is to rely on the center of gravity rotation. The thin butterfly structure is a straight through flow passage, and the spring on the hinge is pressed against the valve seat to seal.