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

The purpose of check valves on the discharge side of a pump is to prevent water from flowing back through the pump when the pump is off. This function is crucial because, without a check valve, water could potentially drain back into the pump or the suction line when the pump is not operating, which can lead to several problems. For instance, backflow can cause the pump to lose its prime, making it difficult to restart. It can also lead to damage to the pump or associated piping due to reverse flow.

Check valves ensure that the flow is maintained in one direction, which is essential for the proper operation of many pumping systems. By preventing backflow, these valves contribute to the efficiency and longevity of the pumping equipment.