Screw vacuum pumps

Atlas Copco DWS series

The Atlas Copco DWS series at a glance: 3 models from the field of screw vacuum pumps – with technical data, variants and the option to send an enquiry.

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  • 3Models
  • 210–460m³/h pumping speed at 50 Hz
  • 0.01mbar lowest ultimate pressure
  • 5.5kW rated motor power at 50 Hz
Operating principle: Screw vacuum pumps (schematic drawing)
Operating principle: Screw vacuum pumps

Product overview

Products of the Atlas Copco DWS series

Each row leads to the model with its technical data and variants.

DWS 200Pumping speed 210 m³/h 50 Hz210 m³/h 60 HzUltimate pressure 0.05 mbarRated motor power 5.5 kW 50 Hz5.5 kW 60 HzVariants 14
DWS 300Pumping speed 280 m³/h 50 Hz280 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power Variants 14
DWS 500Pumping speed 460 m³/h 50 Hz460 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power Variants 7

About the series

Technology and features

Operating principle

Dry screw vacuum pumps convey the gas from the inlet to the outlet with two screw rotors that intermesh without contact. The pump chamber is oil-free; the pumps reach rough and medium vacuum in a single stage, are insensitive to water vapour and particles and are suitable for continuous operation.

The technology page shows the operating principle with an interactive drawing: Screw vacuum pumps.

Features of the series

  • Directly flange-mounted motor, versions for all regions; also available without motor
  • Dedicated accessories: silencers, non-return valves, transmitters and brackets for DRB and ZRS booster pumps
  • Tapered screw rotors with variable pitch (hybrid profile of parallel and tapered sections): high pumping speed with a small footprint and low energy demand
  • Robust water cooling system; DWS 200 and 300 also available air-cooled (indirect cooling)
  • IP54 degree of protection, ATEX-certified variants also available (on request)
  • Dry, oil-free pump chamber – no contaminated oil that has to be disposed of

Manufacturer's data as given in the product descriptions of the individual models.

Frequently asked questions

Questions about the Atlas Copco DWS series

Which models does the Atlas Copco DWS series comprise?
The Ehrler & Beck catalogue lists 3 models of the series. The product overview names each model with its key figures and the number of its variants; the model page shows the technical data.
Which pumping speeds does the series cover?
At 50 Hz the models cover pumping speeds from 210 to 460 m³/h. The figure comes from the product data of the individual models; values for 60 Hz, where available, are given in the product overview.
What ultimate pressure do the models of the series reach?
Depending on the model, the ultimate pressure lies between 0.01 and 0.05 mbar. The figures on the page of the respective model are decisive.
How does the technology of the series work?
The series belongs to the field of screw vacuum pumps. The technology page explains the operating principle with an interactive drawing and names all series of this technology.
Does Ehrler & Beck supply spare parts and service for the Atlas Copco DWS series?
Yes. Ehrler & Beck supplies the models of the series as well as spare parts and accessories and takes care of maintenance and repair. For a quotation, an enquiry with the model or part number is all it takes.

Which model fits your process?

Tell us the gas to be conveyed, the working pressure and the flow rate you need – we will advise you on selection, spare parts and service.

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