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. Check valves are designed to allow water to flow in one direction only and will automatically close if there is a reverse flow. This is critical in preventing contaminants from entering the clean water supply and ensuring that water flows in the desired direction throughout the system.

While automatic shutoff valves and flow regulators perform specific functions, a check valve's defining role is to maintain the integrity of the water distribution system by stopping unwanted backflow. Enhancing pressure relates more to pump and system design rather than the specific role of a check valve. Thus, the focus of a check valve is squarely on backflow prevention, which is vital for maintaining safe drinking water standards and protecting public health.