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2. Rotary-screw compressor - Wikipedia

   en.wikipedia.org/wiki/Rotary-screw_compressor

   Thus the screw of a screw compressor is asymmetrical along its length, while a screw pump is symmetrical all the way. The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors.

3. Variable-speed air compressor - Wikipedia

   en.wikipedia.org/wiki/Variable-speed_air_compressor

   Large electrical cost savings can be achieved by installing a variable speed drive compressor in place of an existing rotary screw or piston machine. Because of this, many governments, including the US and UK, are pushing the industries to move towards this technology in hopes of reducing wasted energy.

4. Compressor - Wikipedia

   en.wikipedia.org/wiki/Compressor

   Rotary vane compressors are, with piston compressors one of the oldest of compressor technologies. With suitable port connections, the devices may be either a compressor or a vacuum pump. They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines.

5. Sullair - Wikipedia

   en.wikipedia.org/wiki/Sullair

   Today, rotary screw compressors are the most popular type of air compressor in operation worldwide. Sullair's leadership decision to stay exclusively with the rotary screw technology when others still relied on piston driven technology, proved to be a valuable decision for the company, and was significant in its growth within the industry.

6. Reciprocating compressor - Wikipedia

   en.wikipedia.org/wiki/Reciprocating_compressor

   A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. [ 1 ] [ 2 ] Pressures of up to 5,000 psig are commonly produced by multistage reciprocating compressors.

7. Pneumatic cylinder - Wikipedia

   en.wikipedia.org/wiki/Pneumatic_cylinder

   Rotary air cylinders: actuators that use air to impart a rotary motion. Rodless air cylinders: These have no piston rod. They are actuators that use a mechanical or magnetic coupling to impart force, typically to a table or other body that moves along the length of the cylinder body, but does not extend beyond it.