The water meter check valve can effectively prevent water backflow, thereby avoiding the water meter from idling due to water flow backflow and ensuring the accuracy of measurement. In addition, it can also reduce the frequency of water meter rotation, effectively solving the problem of water meter rotation caused by pressure fluctuations. When the pressure inside the water pipe increases and the water is compressed, the water meter will rotate in the positive direction; When the pressure drops, the check valve closes and the water meter does not rotate. Therefore, as long as the pressure does not exceed the pressure setting of the check valve, the water meter will not rotate again, greatly controlling the frequency of rotation of the water meter.

For commercial or industrial users, especially in scenarios with complex systems and high water consumption, it may be necessary to install check valves before and after the water meter. Installing a check valve in front of the water meter can effectively prevent damage to the water meter due to backflow, protect the internal structure of the water meter from damage, and ensure the normal metering function of the water meter. At the same time, it can also help maintain stable system pressure and ensure the accuracy of water meter measurement. Installing a check valve after the water meter can further prevent the backflow of water from the user end into the public water supply system, providing more comprehensive protection for the system.

For household users, the water supply system is relatively simple, so installing it behind the water meter may be more practical. This can effectively prevent the backflow of water from the user end into the public water supply system, protecting the safety of the public water supply system. In some special cases, such as when there may be water backflow in old pipeline systems, or when the water quality at the user end in some high-rise buildings may affect the overall water supply system, installing check valves is particularly important. At this point, a suitable installation location can be selected based on the actual situation to ensure the safety and stability of the water supply system.

The working principle of the water meter check valve is based on the action of fluid pressure. When a fluid (such as water) flows in the normal direction, the fluid pressure will open the valve disc, allowing the fluid to pass through. When the fluid attempts to flow in the opposite direction, the valve disc will automatically overlap under the action of fluid pressure, cutting off the reverse flow path of the fluid and thus preventing the backflow of water flow.