Glossary · Pneumatics and hydraulics
Compressor
Also known as: Air compressor
German: Kompressor
In pneumatics, a compressor is a machine that raises the pressure of air or another gas by reducing its volume, for example by pistons, rotating screws or dynamic impellers, to supply compressed air to a plant.
- Fluid power
In one sentence
A compressor raises air pressure by reducing its volume, supplying compressed air to a plant via pistons, screws or impellers.
Example
Two oil-injected screw compressors with a common controller supply the plant's compressed air network at 7 bar.
How it applies
- Engineering: Compressor type and size follow from air demand, pressure, duty cycle and air quality. Receivers, dryers and filters complete the supply. Heat recovery can reuse much of the input energy.
- Operation: Compressor controllers coordinate several units and pressure bands; leaks increase run time.
- Maintenance: Oil, filters, separators and condensate handling need regular service; pressure vessels may need periodic inspections under national rules.
- Documentation: Cover noise, hot surfaces, automatic start (the compressor can start at any time when pressure drops) and stored pressure in receivers. Make Unexpected startup a clear warning on the unit and in the manual.
Compressor vs. vacuum pump
A compressor raises gas pressure above ambient. A vacuum pump removes gas to produce pressure below ambient. Some machines can do both, but they are rated differently.