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Rotary Pumps

What is a rotary pump?

Considered a positive displacement type that uses rotating mechanisms to move fluids or gases through piping systems. There are several types including gear pumps, screw pumps and vane pumps.

Unlike reciprocating pumps, which create a pulsing flow, rotary pumps are designed to generate a steady, unvarying flow. The main disadvantage is in order to work with maximum effectiveness, they need to have a very close clearance between the rotating mechanism and the walls of the pump chamber. Any wear and tear around the edges of the mechanism can greatly reduce pump performance.

How do they work?

The most basic types contain one or two rotating parts that are moving withing a non-concentric casing. The rotating parts create a vacuum in the suction, and move the liquid through the pump to the discharge. Some types, particularly screw pumps and rotary vane pumps, are a little more complicated than this, but the basic principles are the same. The turning mechanism simultaneously moves liquid through the outlet while drawing more liquid through the intake.

Where are they used?

Rotary pumps have a wide variety of applications, making up about 10 percent of all the pumps used in industry. They’re best for pumping clean and non-corrosive, non abrasive liquids, which makes them useful in oil transfer applications in the food industry.

Other related Pump Types include: piston pumps, lobe pumps, process pumps, chemical pumps.

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