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Oil-sealed rotary piston pumps/combinations

GLS 250-500 Series

Low lifecycle cost

Thanks to the slow rotational speed, reliability is optimum and lifecycle cost is low.

State-of-the-art control

Lubrication of the internal components of the pumps is completely automatic. This pump is fitted with a 230/460 V coil for control of the oil solenoid valve which prevents the pump from flooding with oil in case of a power failure or loss of vacuum.

Reduced maintenance

All GLS pumps are fitted with a water mizer to minimize the water consumption and optimize the running temperature. This brings extra reliability, a longer period between maintenance and a very low lifecycle cost.

Reliable system protection

To allow pumping of high vapor loads, integral gas ballast is fitted. This is used to prevent condensation of the vapor carried by the pump gases.

Better dependability with minimal maintenance

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. The GLS has been improved, upgraded and fine-tuned. 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
  • Heat treatment
  • Vacuum melting
  • Metallurgy
  • Leak detection
  • PET processing
  • Large area glass coating
  • Large chamber pumping requirements
  • Pharmaceuticals
  • Transformer drying and cable fluid conditioning
  • Vacuum coating
  • 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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