What is the function of a check valve?

The function of a check valve is to allow water to move in one direction only. This is a crucial component in many water systems, including plumbing and industrial applications, as it prevents backflow that can occur when there are pressure changes in a system. By ensuring that water flows in one direction, check valves help maintain the system's efficiency and protect equipment from potential damage caused by reverse flow.

For example, in a pump system, if water were to flow backward due to a loss of pressure or equipment failure, it could lead to contamination or damage. The design of the check valve uses a disc or gate that closes automatically when water attempts to flow back, thereby ensuring the integrity of the system. Unlike functions associated with other options, which relate to circulating capabilities, pressure regulation, or filtration, the primary role of a check valve is strictly related to controlling the direction of flow and preventing backflow.