Oil Sealed Liquid Ring Vacuum Pump Systems: Pros and Cons

Get maximum reliability under the toughest conditions.

Oil-sealed liquid ring vacuum pump systems give maximum reliability under the toughest conditions. These highly efficient systems are known for their simplicity in design and low maintenance requirements due to the absence of wearing parts. Compared to other vacuum pump systems, these systems offer advantages of no metal-to-metal contact between the impeller and casing and also require no internal lubrication. By using specially formulated low vapor pressure sealing fluid, they can operate up to 10,000 hours or more without an oil change, while preventing corrosion and scale build-up. An additional advantage of oil-sealed systems is that the use of water – and the corrosion and waste associated with it – has been completely eliminated. The air/oil separator virtually eliminates oil carryover concerns and ensures the cleanest environment. Switching from water cooled to air cooled will also produce significant cost savings on water usage and reduce groundwater runoff contamination.

The oil-sealed vacuum pump is also very adaptable to the utilization of a Variable Frequency Drive (VFD). The VFD is applied in industries where ruggedness, reliability and cost-effective operation are of the utmost importance. When demand for vacuum decreases, the VFD will reduce the speed of the vacuum pump, which in turn significantly reduces power consumption. VFD’s are affordable and easy to install and are one of the most cost-effective ways to maximize efficiency and reduce operating costs – frequently saving up to 50% in energy costs.


  • Low maintenance
  • Durable
  • Extremely quiet with soundlevels in the 75-80 dBA range
  • High capacity for contaminants
  • Can operate at low vacuum without overheating
  • Available in single or two-stage pumps
  • Available in air-cooled or water-cooled
  • Available explosion proof
  • Eliminates the use of water

Representative industries served:

  • Hospitals
  • Laboratories
  • Biodiesel plants
  • Remediation projects
  • Printing companies
  • Food industry
  • Plastics

John Henry Foster is able to assess and recommend the most efficient and cost effective equipment on the market today. Contact us to find the best application for your oil sealed liquid ring vacuum pump systems.

Richard A. Dean Air Systems Product Manager John Henry Foster 651.681.5749 rich.dean@jhfoster.com www.jhfoster.com

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651-452-8452 | 800-582-5162


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