Rotary Vane Pumps

For all applications in the low and medium vacuum range

Pfeiffer Vacuum rotary vane pumps have been the most popular pumps for generating low and medium vacuum for many years now. They are sturdy and have a long life, whether they are used as backing pumps to generate the backing pressure called for by turbopumps, or as a single standalone pump. Rotary vane pumps belong to the family of displacement pumps and convey a virtually steady low-pulsation suction volume flow, irrespective of the type of gas used. They work on the principle of an eccentrically supported rotor revolving in a housing, and have two or more movable vanes. Every Pfeiffer Vacuum rotary vane pump is oil-lubricated. Special vacuum oils, also known as operating fluids, are responsible for insulating and lubricating components, resulting in very low final pressures. The oil lubrication also ensures an extremely long lifetime, even in continuous operation.

A choice of versions provides the right variant for every application
Pfeiffer Vacuum rotary vane pumps cover an extremely wide range of pumping speeds from 1.25 to 1,600 m3/h (60 Hz to 1,920 m3/h). Two different types of pump are available to choose from: single-stage and two-stage rotary vane pumps. Two-stage pumps are ideally suited for processes in the medium vacuum range. Single-stage models are the pump of choice when the working pressure is mainly in the low vacuum range.

Magnetic coupling for maximum operating reliability
Most Pfeiffer Vacuum rotary vane pumps can be supplied with an optional magnetic coupling. This enables the customary shaft seals for this type of pump to be eliminated. The magnetic coupling dispenses with the need for shaft seal maintenance, and also makes oil leaks a thing of the past.

Maximum lifetime even in demanding processes
The oil, or operating fluid, allows rotary vane pumps to be adapted more closely to the process in hand. As an example, Pfeiffer Vacuum offers special oils for corrosive processes. All Pfeiffer Vacuum operating fluids have been specially developed with a particular type of pump in mind. Special attention was paid to combining optimum vacuum performance with a long pump life using a particular operating fluid.

The use of accessories expands applications for rotary vane pumps even more. By using cooling traps or adsorption traps, aggressive media can be separated off before reaching the pump, thereby extending the life of the pump and operating fluid. Oil mist filters for the pump outlet ensure clean exhaust air. A wide range of additional accessories for monitoring pump characteristics enables the pump to be linked to control and process equipment.

Vacuum technology plays a key role in the manufacture of many everyday products and in many technical research sectors. The rotary vane pump is of decisive importance for reliable vacuum generation.

  • 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

Operating information for adaptation to processes
Two-stage rotary vane pumps are ideally used in a process window between 100 hPa and a pressure about a decade above the final pressure. At pressures above 100 mbar, components in the exhaust oil separator clog up very quickly due to the oily exhaust gas stream. The strong dependence of the pumping speed on the intake pressure greatly affects the final pressure range. It is not possible to operate any stationary processes in this state.

Most models are able to take in gas ballast to prevent condensing moisture from resulting in accumulations of liquid. The use of gas ballast has different impacts on the performance data of pumps. The pumping speed reached by single-stage rotary vane pumps, for example, is reduced by the proportion of gas ballast present. The final pressure is increased as a result. Owing to the design, gas ballast does not have any influence on the pumping speed of two-stage pumps.

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