Chapter | three. Air Compressors, Air Treatment and Pressure Regulation
The vast majority of pneumatic systems use compressed atmospheric air as the operating medium (a small number of systems use nitrogen obtained commercially from liquid gas suppliers). Unlike hydraulic systems, a pneumatic system is ‘open’; the fluid is obtained free, used and then vented back to atmosphere.
Pneumatic systems use a compressible gas, hydraulic systems an incompressible liquid, and this leads to some significant differences. The pressure of a liquid may be raised to a high level almost instantaneously, whereas pressure rise in a gas can be distinctly leisurely. In Figure 3.1a, a reservoir of volume two cubic meters is connected to a compressor which delivers three ...
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