Quimby Screw Pump (from Internet Glossary of Pumps)
Quimby Screw Pump
Quimby Screw Pumps use closely matched screws which mesh to form pockets of fluid. Each shaft has a left-hand screw and a right-hand screw, for hydraulic pressure balance.

On the left is a side view. The animation on the right is a top (or bottom) view. The inlet is at each end and the outlet is in the middle. The two shafts are geared together and revolve at the same rate, up to about 1750 RPM.

Quimby Screws often pump oil, which lubricates the meshing gears. They have no valves or small parts to wear out or break, and the stuffing boxes are in the low pressure part of the pump where they are less prone to wear.

A Quimby Screw can pump 4,000 gallons per minute at 1,000 P.S.I.

(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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