How Does an Articulated Piston Pump Works?

The articulated piston compressor utilizes the same operating principle as a conventional car engine piston. The articulated piston transfers rotational energy from a motor/pulley into a reciprocating motion used to compress air in a cylinder. The rotational motion is transferred through an eccentric and bearing assembly (the big end) to the conrod, then through the wrist pin (the little end) to the piston itself.

As the piston moves down inside the cylinder, the air is drawn in through a one-way intake valve. On the upward stroke, this air is exhausted through a one-way exhaust valve. Sealing of the piston to the cylinder is achieved by using two piston rings each backed with a spring to keep them in contact with the cylinder wall. A piston skirt guides the piston in the cylinder.

These compressors are available in AC (single or three-phase), pulley driven, and the smaller sizes are also available in DC motor.

Articulated Piston Pump - working principle

The articulated piston compressor works in the same way as a typical car engine piston.

Where Are Articulated Piston Pumps Used?

The dry-running articulated piston compressor is suited to tough, industrial applications that require relatively high flow rates combined with pressure.

What Are the Benefits of Articulated Piston Compressors?

  • Oil-less
  • Suitable as compressor
  • High capacity, permanently lubricated and sealed bearings
  • PTFE or carbon piston rings and skirts
  • Long, service-free life
  • Robust design
  • Field service capability
  • High strength stainless steel valves
  • Thomas articulated piston compressors provides flow rates up to 5.4 cfm (153 l/min), pressure up to 175 psi (12.1 bar)

Select Max. Suction Height

0-3 mH2O
3-6 mH2O
6-10 mH2O

Select Primary Medium Type


Select Flow Rate (cfm)

up to 0.035 cfm
0.035-0.176 cfm
1-2 cfm
2-3 cfm
3-4 cfm
4-5 cfm
above 5 cfm

Select Flow Rate (l/min

up to 1 LPM
1-5 LPM
5-10 LPM
10-20 LPM
20-30 LPM
30-50 LPM
50-100 LPM
above 150 LPM

Select Max. Vacuum

Up to 300mbar / 9 in.Hg
300-500 mbar / 9-14.75 in.Hg
500-800 mbar / 14.75-23.6 in.Hg
800-900 mbar / 23.6-26.6 in.Hg
Above 900 mbar / 26.6 in.Hg

Select Max. Pressure Level

Up to 1 bar/14.5 psi
1-2 bar/14.5-29 psi
2-5 bar/29-72.52 psi
5-7 bar/72.52-101.53 psi
7-10 bar/101.53-145 psi
above 10 bar/145 psi

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