Dry Screw Vacuum Pumps

S Series – Dry Screw vacuum pump

The dry and contact free operation of the Elmo Rietschle S-Series screw vacuum pumps requires no lubrication in the pumping chamber. This translates into major advantages: no process contamination and no pollution caused by the pump operation.

S Series – Dry Screw vacuum pump

Wide performance range

Our S-VSI screw vacuum pumps achieve an ultimate vacuum of 0.08 mbar (abs.) and can operate at any pressure between end vacuum and atmospheric pressure.

Rugged and durable design

In the pump housing, two parallel screw rotors, both timing gear synchronized, turn in opposite directions. Gas is compressed in the direction of the discharge port. Gearbox and mechanical seals are oil lubricated. Cooling is achieved through the continuous flow of coolant through the pump housing. Our S-Series screw pumps feature high vapor and liquid tolerance, are easy to service and have a long service life – the low rotational speed ensures low noise and low vibration operation.

Multiple applications

Elmo Rietschle screw vacuum pumps are primarily used in applications across many different industries where clean, oil free vacuum is needed. They can also be combined with a vacuum booster in customized vacuum systems for very high suction capacities. General industrial applications such as packaging, drying and coating or vacuum furnaces are best served by our S-VSI range of pumps.

These sturdy vacuum pumps requiring little maintenance and service are dry running and offer remarkably low life cycle costs. Food packaging and processing are typical areas which benefit most from this machine – especially when it comes to oxygen applications.

Advantages at a glance

  • Dry running, contact free operation
  • High vacuum in one stage
  • Application specific options
  • High water vapor tolerance
  • Short evacuation time due to high suction capacities
  • Low noise level
  • Easy to service
  • Low life cycle costs
  • Oxygen version available

Technical Features

  • Volume flow 100 to 600 m³/hr
  • Ultimate vacuum 0.08 mbar (abs)


  • Food Packaging and Processing:  Tray sealing, MAP packaging, Degassing, Drying, Tumbling. Cutting, Mixing, Cooling
  • Industrial applications:  Cleaning, Coating, Drying, Dust extraction systems, Industrial furnaces, Vacuum metallurgy
  • Packaging industry: Central vacuum systems
  • R&D / laboratories: Different process applications
  • Solar technology: Cell lamination: Glass plate handling
  • Surface technology / electronics: CVD processes, PVD processes, Vacuum metallurgy