Lift Pump (from Internet Glossary of Pumps)
Lift Pump
This pump can still be found on farms everywhere. The maximum suction to the lower valve (shown in red here; called the FOOT VALVE) is about 30 feet.

Water enters the lower chamber when the movable sealed plate is raised. The red valve is open and the green valve on the plate is closed.

When the plate is pushed back down, the red valve closes, and the liquid in the lower chamber is forced through the green valve, which opens.

On the next upstroke of the plate, the liquid which passed through the green valve on the previous downstroke is raised and spills out the spout.

(This is a still representation and possibly also a low-resolution image of a pump which is fully animated in the CD-ROM version of this glossary.)

Go to web page describing Statistics Explained

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Last modified February, 2002
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