What is the primary purpose of a check valve in a water system?

The primary purpose of a check valve in a water system is to prevent backflow. This is crucial in maintaining the integrity of the water supply and ensuring that water flows in one direction only. Backflow can lead to contamination of the potable water supply by allowing non-potable water, debris, or other harmful substances to enter the system. By using a check valve, the system effectively blocks any reverse flow that could compromise water quality and safety.

While regulating flow, acting as an automatic shutoff valve, or enhancing pressure are important functions in water systems, these tasks are typically handled by other components such as flow control valves, shutoff valves, or pressure regulators. The specific design and function of a check valve focus solely on preventing undesired backflow, thereby ensuring a safe and reliable water supply.