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WOB-L® Piston Pumps and Compressors

Thomas piston vacuum pumps and compressors are available with exclusive WOB-L® pump technology. 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.


Benefits of Thomas Piston Vacuum Pumps and Compressors

Thomas oil-less piston vacuum pump and compressors are built with corrosion-resistant materials, making them suitable for industrial and mobile applications. 

The WOB-L® piston pump designed by Thomas provides a free flow rate from 0.5 cfm (13.6 l/min) to 7.5 cfm (200 l/min) and offers maximum continuous vacuum capability up to 990 mbar (29.2 in.Hg), and maximum continuous pressure capability up to 12 bar (175 psi). The wide range of performance and applications is demonstrated in the rich portfolio of 37 product series listed below and available in the Product Search section.

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

Thomas WOB-L® piston vacuum pumps and compressors are the best choice for medical, food, or environmental applications that require long life and high performance. High-pressure piston vacuum 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.

With three manufacturing sites, located in the USA, Germany, and China, including on-site regulatory testing, injection molding, and 3D printing capabilities, we offer gas flow solutions for a variety of industries. Application expertise enables Thomas’ engineers to tailor pump performance even to the most complex and challenging application.


Featured Applications using WOB-L® Piston Vacuum Pumps and Compressors

Key Medical Applications:

  • Ventilators (Respirators)
  • Oxygen Concentrators
  • Disinfectant Sprayer
  • Blood Analyzer
  • Clinical Aspirators
  • Dialysis/ Hemodialysis
  • Dental Vacuum Oven

Other Key Applications:

  • Air Suspension Systems
  • Vending Machines / Coffee Dispensing and Cappuccino Makers
  • Skin Massagers

WOB-L® Gas Piston Pump Operating Principle

The WOB-L® piston pumps are a type of reciprocating pump that converts the rotary motor’s energy into the piston's linear motion within the pump cylinder. The piston rod, usually single-casted, 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 cylinder by a flanged disk cup, which forms both axial and radial seal and a mechanical guide for the piston. It runs dry without lubrication in contact with the cylinder, coated with low friction and high heat conductivity materials.


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