What is the primary purpose of a check valve used on a pump station?

The primary purpose of a check valve in a pump station is to prevent reverse flow. This type of valve is designed to allow fluid to flow in one direction while blocking any backward movement of that fluid. When the pump is operating, it generates pressure that pushes water through the system. If the pump were to stop or if there was a drop in pressure, without a check valve, water could flow back into the pump, potentially causing damage or leading to contamination. By ensuring that flow can only occur in the intended direction, the check valve protects the integrity of the pump station and the entire system, maintaining proper operation and efficiency.

The other choices focus on functionalities that, while important in certain contexts, are not the primary role of a check valve. For instance, isolation of the pump for maintenance involves valves that are specifically designed for that purpose. Reducing water hammer is managed through other means, such as surge tanks or air chambers. Monitoring the force main might involve specialized sensors or monitoring equipment rather than a check valve, which does not have that capability.