What is the purpose of a check valve in a pumping system?

• A. To prevent reverse flow and protect equipment.
• B. To accelerate flow.
• C. To regulate temperature.
• D. To filter solids.

Answer: (A)

A check valve is a one-way device that prevents fluid from flowing backward in a pumping system. It stays open as fluid moves in the intended direction, then automatically closes if pressure on the discharge side tries to push flow back toward the pump. This stops backflow, protects the pump and downstream equipment from reverse pressure, helps maintain system prime and downstream pressure, and can reduce contamination or unwanted siphoning. The other options don’t fit because accelerating flow is the job of the pump, regulating temperature isn’t what a check valve does, and filtering solids requires a filter or strainer, not a check valve.