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.