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What You Need to Know About Rotary Vane Pumps

What is a Rotary Vane Vacuum Pump and how does it Work?

It's a sort of pump that enables the compression of air inside the pump chamber to create suction, allowing air molecules to be removed from a vessel or area.

The Rotary vane vacuum pump works on a positive-displacement pumping principle. The structure consists of a rotor, that is mounted eccentrically in a cylindrical housing or stator. Centrifugal force causes the blades inside the rotor to move in and out as they follow the inside surface of the housing.

Types of Rotary Vane Vacuum Pump

Rotary vane vacuum pumps come in single-stage and two-stage models, and they can be used with various types of lubrication or run dry. Dry vacuum pumps and oilless vacuum pumps are pumps that do not use any fluids or oil to create a vacuum while the oil ones need it to keep the vacuum pump in good working condition and prevent it from damage.

Differences Between Single-Stage and Two-Stage Rotary Vane Pumps

Single-stage pumps exhaust into a built-in chamber in the pump, which separates the oil from the pumped gas. The oil is returned, and the gas is exhausted. They are less expensive than similar two-stage pumps and work well at rough vacuum levels.

Two-stage pumps integrate a low vacuum stage and a mated high vacuum stage into one unit. The high vacuum stage collects process gas and transports it to a second, lower vacuum stage, which compresses the gas to atmospheric pressure, helping to increase the pump's vacuum performance. They provide a greater pressure range, usually an upgrade of a decade or two (10-1 Torr vs. 10-3 Torr) for operations that require a deeper vacuum.

In other words, if the vacuum level isn't an issue, a single-stage vane pump may work. The two-stage rotary vane pump, on the other hand, would be the best choice if deeper pressure with good vacuum performance is required.

Rotary Vane Vacuum Pump Maintenance

Rotary vane vacuum pumps are robust pumps, which, with regular maintenance, will last a very long time. The pump's longevity can be extended by proper lubrication. For this reason, rotary vane pumps require regular oil changes. These pumps are ideal for use in chemical and biological processes. A rotary vane pump has low start-up costs and long service life. We recommend a rebuild/overhaul periodically to extend the life of your pump. Contact A-VAC for service information today.


  • One compressor unit for a high-end vacuum.
  • Blades with a long-life span
  • Optimized oil-water separation (oil-lubricated only)
  • Gas ballast provides high water vapor tolerance (oil-lubricated only)
  • Low levels of noise and vibration
  • Virtually pulsation-free
  • Easy to maintain
  • It can be used in a variety of industrial applications

Rotary Vane Vacuum Pumps can be Used For:

  • All applications in low and medium vacuum
  • Ideal backing pump for turbopumps and Roots pumps
  • General laboratory use
  • Analytics
  • Chemical laboratory
  • Freeze-drying
  • Process engineering

The Rotary Vane Pumps are known for their reliability and efficiency and they are ideal for a variety of applications. Visit our website to learn more about rotary vane vacuum pumps, or give our office a call and speak to one of our vacuum pump specialists.