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Check valve function

Author: Site Editor     Publish Time: 2019-01-21      Origin: Site


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In our lives, I believe that everyone is no stranger to the check valve, perhaps because some factors are often seen by some people. Then the main function of the check valve is to prevent the back flow of the medium inside our pipeline. The following describes the check valve function in detail.


Here is the content list:

l  What is the function of check valve? 

l  Check Valve installation should pay attention to the following matters

What is the function of check valve? 

1. Check valve function: prevent medium backflow, prevent pump and drive motor reversal, and container medium release.        


2. Check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent medium backflow, also known as check valve, one-way valve, counterflow valve, and back pressure valve. Check valve is an automatic valve.       


3. Check valves are divided into lifting check valves, swing check valves and butterfly check valves according to their structure.  Lifting check valves are divided into vertical and horizontal. Swing check valves are divided into three types: single-lobe, double-lobe and multi-lobe. Butterfly check valve is straight-through type. These check valves can be divided into threaded connection, flange connection, welding connection and clamp connection.

The stop valve is based on the flow of the medium itself, and then the valve flap will be automatically opened and closed, so that the phenomenon of the medium back flow valve can be effectively prevented. It is a type of automatic valve whose main function is to prevent back flow of the medium and to prevent the pump and drive motor from turning over. At the same time, the discharge of the container medium is also stopped, and the stop valve can also raise the pressure therein to the line given by the auxiliary device which is already greater than the system pressure.


If the check valve is installed in the pipeline installation, then its function will cause the flow of the medium to stop. In terms of material selection, it can be used for many kinds of media such as water and water vapor. Prevent the effects of flow. This main material is made of carbon steel and low-temperature steel. Its main feature is that the valve flap is closed quickly, the service period is longer, and the performance is more reliable.


The water supply equipment of the check valves are used to stop the high-pressure water after the impact of the pump impeller. Then, due to certain factors, the pump suddenly stops working. The pressure inside the pump is gone, and the high-pressure water connected to the pump outlet will flow into the pump again in the opposite direction. When the check valve is installed at the outlet of the pump, it will immediately close, so as to stop the high-pressure water from flowing into the pump again in the opposite direction.

Check Valve installation should pay attention to the following matters


A. Check valves should not bear weight in pipelines. Large check valves should be supported independently so that they are not affected by the pressure generated by the pipeline system.         

B. Attention should be paid to the direction of medium flow during installation in accordance with the direction of arrow marked on the valve body.          

C. The lifting vertical valve shall be installed in the vertical pipe.          

D. Horizontal lift check valves should be installed in horizontal pipelines.


The working principle of the check valve is to start and close according to the pressure change of the mink fluid itself to prevent the medium from flowing back. It is mostly used in water supply pipelines.


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