AWWA Water Treatment Operator Certification Practice Test

The valve installed at the end of the suction pipe on a centrifugal pump is known as a foot valve. Its primary function is to keep the suction line filled with water when the pump is not operating, preventing backflow and ensuring the pump remains primed. This is crucial for maintaining the efficiency of the pump and its ability to operate correctly, as it helps overcome the potential for air entering the suction line, which could lead to cavitation or the pump failing to draw in water.

In contrast, other types of valves serve different purposes. The suction valve would typically refer to any valve on the suction line, but it does not specifically denote the valve type designed to prevent backflow and maintain prime. The discharge valve is located on the discharge side of the pump and regulates the flow out of the pump, whereas the control valve is used to manage flow rate in a system but is not specifically tied to the operation of a centrifugal pump's suction line. Understanding the distinct role of a foot valve is essential for effective water treatment and management in pumping systems.