What is the primary function of a check valve in plumbing systems?

The primary function of a check valve in plumbing systems is to prevent backflow. This essential component allows fluid to flow in one direction while blocking the reverse flow, which can help protect the system from contamination and maintain proper pressure and flow within the pipes. Preventing backflow is crucial in applications such as water supply lines, sewage systems, and irrigation, as it ensures that clean and safe water is not tainted by discharges from other systems or contaminants.

In summary, check valves serve to safeguard the integrity of plumbing systems by ensuring that water flows in the desired direction and preventing potential hazards associated with backflow.