Progressive Cavity Pump (from Internet Glossary of Pumps)
Progressive Cavity Pump
Progressive (or Progressing) Cavity pumps, a type of Single Screw pump, are used for highly viscous liquids such as peanut butter or glue, and also for liquids with significant amounts of solids such as cement or sand slurry.

Fuild proceeds from the entrance, at the top on the right side here, to the left. The rotor revolves inside the stator.

The stator is a twisted cavity with an oval-shaped cross-section. It is usually made of natural or synthetic rubber, steel, or plastic. The rotor is usually steel.

For a given diameter and shape of the rotor, doubling the number of stages (the length) will double the output pressure.

The area of the cross-section of the rotor determines the backpressure the pump must withstand.

(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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