WOB-L® Piston Pumps and Compressors

Piston Air Compressors and Vacuum Pumps Designed for Exceptional Pressure and Flow

Thomas piston pumps utilize proprietary WOB-L® pump technology from Gardner Denver. WOB-L® piston pumps can provide higher pressure and flow capabilities than many other pump technologies, in a much smaller package. They cover a wide range of applications due to the breadth of product platforms and performance capability.

Flow rates range from 5.4 l/min (0.19 cfm) to 212.4 l/min (7.5 cfm). The pneumatic performance covers pressures up to 12 bar (175 psi) and vacuum levels up to -990 mbar (29.2 in.Hg). Various motor options address lifetime requirements.



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Benefits of Thomas WOB-L® Piston Pumps and Compressors

Thomas oil-less piston vacuum pump and compressors provide a range of remarkable benefits, such as:

  • low vibration and balanced flow for smooth operation
  • low power consumption platform for reduced energy use
  • higher performance capabilities in a much smaller package, enabling use even when only a limited amount of space is available.
  • can generate the highest pressure among all pump technologies
  • Build with corrosion-resistant materials making them suitable for medical, industrial, food & beverage markets
  • Maintenance and service free operations through continuous work cycles

Characteristics of Thomas WOB-L® Piston Pumps and Compressors

We have over thirty standard catalog series and a full range of possible pump configurations to offer. Thomas is well-known for offering an outstanding customization range that includes options for materials, head porting, foot mounting, electrical hook-up, cooling airflow directions, and multiple strokes, and bore sizes.

  • Free flow up to 90 l/min 212 l/min (7.5 cfm)
  • Maximum pressure up to 12.1 bar (175 psi)
  • Maximum vacuum up to 1 mbar abs. (29.2 in Hg)
  • Optional restart against pressure or vacuum 
  • Single or twin piston
  • Single or two stage
  • AC, DC or brushless DC

Choose Thomas Wobble Piston Compressors and Vacuum Pumps for a Wide Range of Gas Applications

Thomas WOB-L® piston compressors and vacuum pumps are the best choice for medical, food&beverage, automotive or environmental applications that require long life and high performance. High-pressure wobble piston pumps and compressors are often selected by the medical market for their high quality and reliability. Life-saving equipment such as oxygen concentrators, ventilators, and other breathing support devices rely on our piston pumps for their critical functions.

Thomas has three manufacturing sites, located in the USA, Germany, and China to offer positive displacement pumps and compressor solutions for a variety of markets. With our capabilities of on-site regulatory testing, injection molding, and 3D printing we help to speed up time to market for our customers. 

Application expertise enables our engineers to tailor pump performance even to the most complex and challenging application. 

Piston Pumps that Suite OEM Devices in Key Industries

healthcare industry

Medical Devices

environmental industry


lab life science industry

Life Sciences

automotive industry


food and beverage industry

Food & Beverage

general manufacturing applications

General Manufacturing

How WOB-L® Piston Pump and Compressors Work?

The WOB-L® piston pumps are dry running reciprocating pumps. They convert the rotary motor’s energy into the piston's linear motion within the pump cylinder. The piston rod is mounted to an eccentric bearing assembly attached to the motor shaft.

A rod/eccentric assembly that rotates about the shaft causes the piston end to tip or wobble, providing the origins for the trademark name. To compensate for the ‘wobbling’ and increase the pump's efficiency, the piston is sealed to the pump cylinder. It’s sealed by a flanged disk cup that forms both axial and radial seal along with a mechanical guide for the piston.

Learn about WOB-L® Piston Technology
WOB-L Piston Pump Technology - Working Principle

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