About deep well jet pumps: 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 Pressure 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 has two parts: the Venturi Throat, which is
the pinched section of the suction tube; and above that
is the venturi itself which is the part where the tube widens
and connects to 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 to keep the
deep well jet pump working.
