What is the purpose of a check valve on the discharge side of a pump?

The purpose of a check valve on the discharge side of a pump is to prevent water from flowing back through the pump. This is crucial in maintaining the operational efficiency of the pump and the entire system. When the pump is turned off, gravity and pressure changes could cause the water to flow backward, which can lead to cavitation, damage to the pump, or a drop in pressure within the system. By integrating a check valve, the water is allowed to move in only one direction — away from the pump and toward the discharge line or storage tank, ensuring that the system retains pressure and prevents any reversal of flow.

This setup is particularly important in applications where consistent pressure and flow direction are necessary for effective operation, such as in water treatment facilities or irrigation systems. The check valve acts as a safeguard against unwanted backflow and helps to maintain system integrity.