Air compressors

Most air compressors either are reciprocating piston type, rotary vane or rotary screw. Centrifugal compressors are common in very large applications. There are two main types of air compressor's pumps: oil-lubed and oil-less. The oil-less system has more technical development, but is more expensive, louder and lasts for less time than oil-lubed pumps. The oil-less system also delivers air of better quality.



rotary-screw-element

Rotary- screw element

Inside the compressor element are two screws (called rotors) that turn in opposite direction. The rotary screw compressor is a positive displacement compressor. Which simply means that the air is physically squeezed together by an external force (like piston- and scroll-compressors, which are also positive displacement compressors).

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Air compressors can be classified according to the design and principle of operation; piston compressors and rotary-screw compressors.

A rotary-screw compressor is a type of gas compressor that uses a rotary-type positive-displacement mechanism. They are commonly used to replace piston compressors where large volumes of high-pressure air are needed, either for large industrial applications or to operate high-power air tools such as jackhammers.
(wikipedia)

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