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Ajom

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  1. When the water pump is running, suction is created, which pulls the water in the upward direction through the pipe. The foot valve is so designed that it opens up easily because of the upward pressure from the incoming water, and thus, normal water flow through the pipe is established. Now, when the pump is turned off, the upward pulling force on the water is removed. As soon as this happens, the Earth's gravitational pull acts on the water in the pipe, and it tries to flow back into the well with only the foot valve in its way.
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