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Overview of Check Valves
abstract：Check valve is an automatic valve used in pipeline systems to open when the medium flows forward and close when it flows backward. Its main function is to prevent the backflow of the medium
Check valve is an automatic valve used in pipeline systems to open when the medium flows forward and close when it flows backward. Its main function is to prevent the backflow of the medium, pump and driving machinery from reversing, prevent water hammer waves generated when the water pump and driving motor suddenly stop running, and reduce damage to the pipeline system. Check valves can be divided into five categories based on the relative displacement between the closing part and the valve seat: lift, swing, disc, diaphragm, and spherical check valves. For the above-mentioned check valves, most of them have the following drawbacks: the "loud noise" and vibration generated by the water hammer when closed; Due to the vibration of the valve plate, mechanical friction motion occurs between the "joint parts" shaft and the shaft sleeve in the valve. When the vibration frequency of the valve plate is too high, mechanical friction motion will occur between the shaft and the shaft sleeve, causing the valve plate to shift and the seal to fail. Sometimes, it can cause the valve plate to fall off, causing the system protection to fail; The fluid flow inside the valve is turbulent, with significant loss of flow resistance and severe energy loss. To avoid and improve the above shortcomings, spherical check valves have been widely used and promoted due to their advantages such as good sealing and minimal flow resistance. Their structure has gradually improved from the initial "single ball" check valve to the "independent multi channel and multi ball" check valve.
Check valves are one of the commonly used types of equipment for fluid transmission, and existing check valves suffer from high resistance and energy consumption. Reducing the flow resistance coefficient is an important way to save energy in fluid transmission. Common check valves include spherical check valves, clamp type check valves, etc. The common drawback of these check valves is that when the fluid is flowing forward and the check valve is open, certain components of the check valve, such as the valve disc or sphere, are located in the center of the flow channel and have a certain water blocking area, which has a greater resistance to the fluid flow and reduces the outlet pressure, thus wasting energy.
Check valves are one of the commonly used types of equipment for fluid transmission, and existing check valves suffer from high resistance and energy consumption. Reducing the flow resistance coefficient is an important way to save energy in fluid transmission. Common check valves include spherical check valves, clamp type check valves, etc. The common drawback of these check valves is that when the fluid is flowing forward and the check valve is open, certain components of the check valve, such as the valve disc or sphere, are located in the center of the flow channel and have a certain water blocking area, which has a greater resistance to the fluid flow and reduces the outlet pressure, thus wasting energy.