WHAT IS THE DIFFERENCE BETWEEN UPSTROKE AND DOWNSTROKE MECHANISM OF A LIFT PUMP?

Upstroke is a mechanism which helps to raise the plunger and downstroke helps to help lower the plunger.
On the up-stroke of the plunger, the lower valve opens and the upper valve is closed. The upper valve is situated on or in the plunger itself. Now a low air pressure is produced in the barrel which allows atmospheric pressure on the surface of the water source, down below, to make the water move up the downpipe and eventually fill the barrel below the plunger.
Whereas, on the downstroke, the lower valve closes and the upper one opens. After that the water is forced into the barrel above the upper valve. On the next upstroke, the water above the plunger is forced out of the spout, located at the top of the barrel, at the same time as the volume below the barrel fills up with water again.

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