Which is the primary function of a swing check valve?

The primary function of a swing check valve is to prevent backflow in a piping system. This type of valve is designed to allow fluid to flow in one direction while automatically shutting off to prevent fluid from reversing direction. The mechanism typically involves a disc that swings on a hinge; when fluid flows in the correct direction, the disc lifts and permits flow. If the flow attempts to reverse, the disc swings shut against the seat, effectively blocking the backflow.

The design and operational purpose of swing check valves make them essential in various applications where preventing backflow is crucial for protecting equipment and ensuring system integrity. This is particularly important in systems dealing with potable water, wastewater, and other fluid applications where contamination or reverse flow could pose significant risks.

While controlling flow rate, reducing pressure, and blending water streams might be functions associated with other types of valves or equipment, the specific role of the swing check valve is focused on preventing backflow, making it essential in maintaining the desired flow direction in a system.