What does a check valve prevent in piping systems?

A check valve is specifically designed to prevent the reversal of flow within a piping system. This means that when fluid flows in the intended direction, the valve opens, allowing for normal operation. However, if there is any indication of backflow, such as a decrease in pressure or a force that would cause fluid to flow in the opposite direction, the check valve closes to prevent this occurrence.

This function is vital for maintaining system integrity and protecting equipment from potential damage caused by backflow, which could lead to contamination or system failures. Thus, the primary role of a check valve is to ensure that the flow of fluid cannot reverse, serving as a critical component in many piping systems where directional flow is essential.