Atlas Copco's oil-sealed rotary piston pump

Oil-sealed Rotary Piston Pumps

GLS 250-500 Series

With an efficient space saving design, excellent performance and reliability, our GLS rotary piston pump is synonymous with efficiency and dependability.

Low lifecycle cost

Slow rotational speed, optimum reliability and low lifecycle cost. Space saving design with a small footprint and a self-contained unit delivered ready to install.

Reduced maintenance

Fitted with a water mizer to minimize the water consumption and optimize the running temperature offering extra reliability and a longer period between maintenance.

Automatic lubrication

Automatic lubrication system provides proper flow of oil to bearings and sealing surfaces and prevents back flow into system in case of a power failure or loss of vacuum.

Rugged construction

Robust cast and ductile iron construction provide a reliable operation. Features an efficient design with high uptime with minimal moving parts and large clearance.

GLS series - Oil-sealed rotary piston pumps

With over 10,000 units sold in 80 years, the Atlas Copco GLS rotary piston pump sets the standard for performance and reliability as the industry’s most efficient, space-saving design. As part of the Atlas Copco Group, Stokes Vacuum continues to innovate oil-lubricated rotary piston pumps.


It delivers even better dependability and productivity combined with minimal maintenance and process downtime, especially crucial in demanding applications such as the automotive or aerospace industry and their supply chains. Designed compactly for maximum uptime with minimal moving parts and large clearance, the GLS rotary piston pump has advanced balancing that reduces vibration and is easy to maintain. Add a ZRS booster to the GLS to increase the pumping speed.


Every feature works towards providing you with exactly what you need. From a low lifecycle cost, to in-house service for extra peace of mind, to reliable operation. Keeping in mind the automotive and aerospace industry and their supply chains, the GLS has been improved, upgraded and fine-tuned.

The GLS is perfectly suited for the following applications:

  • Chemical processing
  • Transformer drying and cable fluid conditioning
  • Vacuum coating
  • PET processing

  • Metallurgy
  • Heat treatment
  • Large chamber pumping requirements
  • Pharmaceuticals

  • Large area glass coating
  • Leak detection
  • Vacuum melting
  • General applications

Technical product specifications

  Metric Imperial
Pumping speed: 234 - 442 m3/hr 138 – 260 cfm
  500 – 2600 m3/hr 294 – 1530 cfm by adding a ZRS booster
Motor power: 5.5 – 18.5 kW (50 Hz) 7.5 – 25 Hp (60 Hz)

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