Edwards EH250 EH500 EH1200 EH2600 EH4200

ZRS 250 – 4200 m³/h

Atlas Copco ZRS 250 – 4200 m³/h

Atlas Copco ZRS pumps are mechanical Roots pumps based on the Roots principle and perfectly suitable for applications in which high volume flow rates are required. In this pump a Roots rotor connected to a hydrokinetic coupling is powered directly by an engine, while the second Roots rotor is driven one-to-one by the first Roots rotor via a synchronisation gearbox, causing it to run in the opposite direction.

As a basic requirement, this pump must be operated with a backing pump able to create a high pressure difference to the atmospheric pressure. Depending on the process or the required final pressure, a single- or two-stage rotary vane pump or screw pump (GHS, DHS) are commonly applied. If a ZRS pump is linked with a dry screw pumps such as the DHS, an entirely oil-free pump mechanism can be achieved. The tried and tested shaft seals ensure that no oil reaches the pump’s suction chamber. This way, the performance of the Roots pump can be maintained during applications that require a maximum of cleanliness.

ZRS pumps have a unique and patented hyrdokinetic fluid drive which couples the engine to the pump mechanism. The hydrokinetic drive offers the following benefits:

  • Evacuation times are reduced by up to 50 %
  • No pressure sensors, bypass lines or valves required
  • Reduced acquisition and operating costs

The hydrokinetic drive varies the pump speed automatically. This way the engine is protected from overloading, overheating is avoided and the pump can be operated with high pressure differences.

The minimal gap dimensions and manufacturing tolerances, the dynamically balanced rotors and the inexistence of bypass lines where something might get stuck minimize maintenance requirements and ensure a smooth and low vibration pump operation.

Areas of application:

  • Vacuum metallurgy
  • Vacuum packaging
  • Drying and degassing
  • Vacuum distillation
  • Vacuum furnaces
  • Thin-film coating
  • Space simulation
  • Vacuum impregnation
  • Vacuum welding and brazing
  • Deep-freeze
  • Vacuum chambers
ZRS Pumpe




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DRB 250 – 2000 m³/h
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