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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.
Free Flow Max
107 l/min (3.8 cfm)
Max Pressure
8.6 bar (125 psi)
Max Vacuum
-878 mbar (25.9 in.Hg)
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Free Flow Max
32.3 l/min (1.14 cfm)
Max Pressure
2.1 bar (30 psi)
Max Vacuum
-920 mbar (27.1 in.Hg)
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Free Flow Max
54.4 l/min (1.9 cfm)
Max Pressure
2.1 bar (30 psi)
Max Vacuum
-870 mbar (25.9 in.Hg)
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Free Flow Max
111.9 l/min (3.95cfm)
Max Pressure
4.1 bar (60psi)
Max Vacuum
-900 mbar (26.6 in.Hg)
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Free Flow Max
90.6 l/min (3.2 cfm)
Max Pressure
6.9 bar (100 psi)
Max Vacuum
92% Local Barometer
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Free Flow Max
88.9 l/min (3.14 cfm)
Max Pressure
100 psi (6.9 bar)
Max Vacuum
90% local barometer
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Free Flow Max
96.3 l/min (3.4 cfm)
Max Pressure
6.9bar (100 psi)
Max Vacuum
90% local barometer
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Free Flow Max
28.3 l/min (1.0 cfm)
Max Pressure
2.1 bar (30 psi)
Max Vacuum
-820 mbar (24.2 in.Hg)
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Free Flow Max
50.1 l/min (1.77 cfm)
Max Pressure
2.07 bar (30 psi)
Max Vacuum
-864 mbar (25.5 in.Hg)
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Free Flow Max
130 l/min (4.6 cfm)
Max Pressure
3.1 bar (45 psi)
Max Vacuum
-920 mbar (27.1 in.Hg)
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Free Flow Max
88 l/min (3.1 cfm)
Max Pressure
6.9 bar (100 psi)
Max Vacuum
-919 mbar (27.2 in.Hg)
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Free Flow Max
127 l/min (4.5 cfm)
Max Pressure
6.9 bar (100 psi)
Max Vacuum
-920 mbar (26.7 in.Hg)
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Thomas oil-less piston vacuum pump and compressors provide a range of remarkable benefits, such as:
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.
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.
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.
