A Jet Pump is a type of impeller-diffuser
pump that is used to draw water from wells into residences. It can be used for
both shallow (25 feet or less) and deep wells (up to about 200 feet.) Above the surface is a standard
impeller-diffuser type pump. The output of the diffuser is split, and half to
three-fourths of the water is sent back down the well through the pipe At the end of the pressure pipe the water is accelerated
through a cone-shaped nozzle at the end of the pressure pipe. Then the water goes through a venturi in the suction pipe. The venturi speeds up the water causing a pressure drop which sucks in more water
through the intake at the very base of the unit. The water goes up the suction pipe and through the impeller -- most of it for another trip around to the venturi.
Helpful links:
http://www.goulds.com/master.asp?id=3
http://www.shawpump.com/jetpumps.html
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