What kind of valve is commonly used to prevent backflow?

A check valve is specifically designed to prevent backflow in a piping system. Its unique mechanism allows fluid to flow in one direction while automatically blocking flow in the reverse direction. This is crucial in water distribution systems, where backflow can lead to contamination or other system failures.

Unlike other types of valves, such as ball valves or gate valves, which are generally used to start or stop fluid flow, the check valve operates passively. It typically has a disc or flapper that opens with forward flow and closes when the flow attempts to reverse, making it ideal for maintaining the integrity of water systems. Therefore, when the goal is to prevent backflow and ensure that water flows in only the intended direction, a check valve is the most suitable choice.