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.

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.