Rietschle's Methods of Vacuum



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Vacuum can be defined as the pressure of a gas which is lower than atmospheric pressure. The vacuum level and air capacity required are the main characteristics when considering the choice of the most appropriate operating principle. Three of Rietschle's four operating principles are used for applications requiring a pressure of upto 1.8 bar, depending upon the required capacity and maximum pressure. Many applications require compressed air and vacuum simultaneously, as for example in the Printing and Paper Handling Industries. To meet the different requirements of this dual function, Rietschle's pressure/vacuum pumps are designed on two different operating principles.
Also, include the Ulvac Heliot Helium Vacuum Leak Detector in your order.
  • Energy requirements.
  • Maintenance costs.
  • Environmental considerations concerning noise and temperature.
  • Air pollution.
  • Motor versions.
  • Physical size.
  • Price.
In addition to the required capacities, and vacuum and pressure levels, several other factors can help in the selection of the most appropriate product.
Additional factors to be considered for vacuum pumps:
  • Operating range between the lowest and highest possible continuous vacuum.
  • Filtration on the inlet of the vacuum pump.
  • Contamination of the air handled.
Additional factors to be considered for compressors:
  • Compressed air temperature.



Radial Principle side image
Radial units operate using a dynamic principle, this means that the velocity of air is changed into pressure. Since stage and multi stage models, as well as those with direct or gear box drive, produce vacuum up to 230 mbar or pressure up to 300 mbar. Capacities range from 100-3000 m3/hr. Radial blowers are air cooled and non-contact operation means there is no wear, making the design virtually maintenance-free.
Side Channel Principle side view
The side channel principle transforms flow energy into pressure energy. A side channel design is suitable for applications requiring both press re and vacuum. Vacuum upto 500 mbar and pressure upto 650 mbar can be obtained. Capacities range from 18-1100 m3/hr. Non-contact operation means that side channel units are practically free of wear and maintenance, also the pumped medium is not contaminated.


Rotary Vane Principle side view
Pressure increase by volume reduction is this principle. The static design offers excellent service in pressure, vacuum or a combination of both. Oil lubricated or dry running, vacuum upto 0.5 mbar (abs) with capacities from 3 to 1000 m3/hr, and pressures upto 2.0 bar with capacities from 3 to 500 m3/hr can be reached. When used as a combined unit, o.8 bar vacuum and 0.8 bar pressure can be achieved simultaneously.
Roots Priciple side view
The Roots pumps are also static compression systems although the compression does not result from an internal volume reduction. Rietschle Roots vacuum pumps are designed for use in pump sets in combination with a rotary vane vacuum pump. The achievable capacities range from 500 to 4000 m3/hr, and ultimate vacuum upto 0.01 mbar (abs).




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