What safety feature prevents backflow in water supply systems?

The check valve is designed specifically to prevent backflow in water supply systems. It allows fluid to flow in one direction while automatically closing to prevent reverse flow when the direction of the fluid changes, whether due to a drop in pressure or other factors. This is crucial in maintaining the integrity of the water supply system, as backflow can lead to contamination or reduced pressure.

Pressure relief valves primarily serve to release excess pressure in a system to prevent damage, while flow control valves are used to regulate the flow rate within pipes. Isolation valves, on the other hand, are employed to completely shut off the flow in a pipeline for maintenance or emergency situations. Each of these valves has its specific purpose within a water supply system, but it is the check valve that specifically addresses the need for preventing backflow.