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In a backflow prevention assembly, what is the function of a check valve?

  1. Prevent the reverse flow of water

  2. Maintain system pressure

  3. Control the temperature of water

  4. Filter impurities from the water

The correct answer is: Prevent the reverse flow of water

A check valve is specifically designed to prevent the reverse flow of water. In the context of a backflow prevention assembly, its primary function is to ensure that water flows in one direction only. By doing so, check valves help to protect the potable water supply from contamination that can occur if water were to flow backward. This is particularly crucial in applications where there is a potential risk of pollutants entering the drinking water supply. While maintaining system pressure, controlling water temperature, and filtering impurities are important aspects of water system management, these functions are not performed by a check valve. The role of the check valve is strictly focused on preventing backflow, ensuring that any potentially contaminated water cannot return to the clean water supply. This makes it an essential component in safeguarding public health and ensuring the integrity of water systems.