What is a foot valve's function in a centrifugal pump system?

A foot valve's primary function in a centrifugal pump system is to hold priming in the suction pipe. The foot valve is a one-way valve located at the bottom of the suction line, submerged in the fluid being pumped. Its design allows liquid to flow into the pump while preventing backflow when the pump is not operating. This feature is crucial for maintaining the priming of the pump, ensuring it remains filled with liquid to operate effectively when started.

Without a functioning foot valve, the fluid could drain back into the source when the pump is turned off, leading to a loss of prime. This would require the pump to be re-primed before it can function again, which can be time-consuming and labor-intensive. Therefore, the foot valve plays an essential role in ensuring the efficiency and reliability of a centrifugal pump by maintaining the necessary conditions for its operation.