North Carolina C-Well Exam 2 Practice Test

Which component helps prevent backflow after the pump stops?

Casing and screen Check valve Pressure switch Discharge piping

Correct Answer:

Check valve

Explanation:

A one-way device in the line, called a check valve, is used to stop water from flowing backward once the pump stops. While the pump is running, pressure from the pumped water keeps this valve open so water can move in the forward direction. When the pump stops, there’s no forward pressure, and gravity or downstream pressure seals the valve shut, preventing any reverse flow back toward the pump or source. Casing and screen protect the pump intake from debris, but don’t stop backflow. A pressure switch controls when the pump turns on or off based on system pressure, not the direction of flow. Discharge piping provides the path for water, but it doesn’t inherently stop reverse flow on its own.

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