compressors...gas but natural gas, oxygen, nitrogen, and other industrially important gases are also compressed. The three general types of compressors are positive displacement, centrifugal, and axial. Positive displacement compressors are usually of the reciprocating piston type, in which the gas is drawn in during the suction stroke of the piston, compressed by decreasing the volume of the gas by...
pneumatic devices...initial intake pressure (usually atmospheric) to a higher pressure. Compressors (as well as other fluid machines) can be classified into two main types, depending on the air or fluid action: (1) the positive-displacement type and (2) the velocity, or dynamic, type.
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