What is the function of a foot valve in the suction line?

What is the function of a foot valve in the suction line?

• A. Prevents water from entering the suction pipe
• B. Allows water to enter the suction pipe but prevents water from passing out
• C. Regulates pressure in the line
• D. Filters solids from entering

Answer: (B)

A foot valve acts as a check valve at the end of the suction line, with a screen to keep debris out. Its main job is to let water be drawn into the suction line when the pump starts, but to close and stop water from flowing back out when the pump stops or pressure reverses. This keeps the suction line primed and prevents loss of prime, which is essential for the pump to start reliably again. The screen helps filter solids, but that filtration is secondary to the valve’s primary backflow-prevention function.

A foot valve acts as a check valve at the end of the suction line, with a screen to keep debris out. Its main job is to let water be drawn into the suction line when the pump starts, but to close and stop water from flowing back out when the pump stops or pressure reverses. This keeps the suction line primed and prevents loss of prime, which is essential for the pump to start reliably again. The screen helps filter solids, but that filtration is secondary to the valve’s primary backflow-prevention function.