Which statement best describes the foot valve in a pumping system?

• A. Filters debris from water entering the pump.
• B. Increases the pump's electrical efficiency.
• C. Prevents backflow into the water source by acting as a check valve in the inlet.
• D. Stores water for use in an auxiliary tank.

Answer: (C)

The main idea is that a foot valve acts as a check valve on the suction line. It allows water to flow into the pump but prevents it from flowing back into the water source when the pump stops. This keeps the suction line filled, preserves prime, and makes starting the pump easier after shutdown. Some foot valves include a screen to catch debris, but filtering is not their primary purpose. They don’t store water or boost electrical efficiency, which are different functions suited to other components.