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2. Linear compressor - Wikipedia

   en.wikipedia.org/wiki/Linear_compressor

   An oil-free valved linear compressor enables the design of compact heat exchangers. [1] Linear compressors work similarly to a solenoid: by using a spring-loaded piston with an electromagnet connected to AC through a diode. The spring-loaded piston is the only moving part, and it is placed in the center of the electromagnet.

3. Free-piston engine - Wikipedia

   en.wikipedia.org/wiki/Free-piston_engine

   Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

4. Rotary-screw compressor - Wikipedia

   en.wikipedia.org/wiki/Rotary-screw_compressor

   Consequently, air treatment identical to that used for an oil-flooded screw compressor is frequently required to ensure quality compressed air. In small piston compressors carpenters homeowners sometimes use "oil free" compressors in which oil free is a reference to not using oil but Teflon type of coatings permanently adhered to wear surfaces.

5. Camless piston engine - Wikipedia

   en.wikipedia.org/wiki/Camless_piston_engine

   A camless or free-valve piston engine is an engine that has poppet valves operated by means of electromagnetic, hydraulic, or pneumatic [1] actuators instead of conventional cams. Actuators can be used to both open and close valves, or to open valves closed by springs or other means.

6. Gas turbine engine compressors - Wikipedia

   en.wikipedia.org/wiki/Gas_turbine_engine_compressors

   A free-piston gas generator is a free-piston engine whose exhaust is used to power a gas turbine. It combines the functions of compressor and combustion chamber in one unit. These machines were quite widely used in the period 1930–1960 but then fell out of favour. [1]

7. Compressor - Wikipedia

   en.wikipedia.org/wiki/Compressor

   Rolling piston compressor. The Rolling piston in a rolling piston style compressor plays the part of a partition between the vane and the rotor. [13] Rolling piston forces gas against a stationary vane. 2 of these compressors can be mounted on the same shaft to increase capacity and reduce vibration and noise. [14]

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9. Category:Free-piston engines - Wikipedia

   en.wikipedia.org/wiki/Category:Free-piston_engines

   Pages in category "Free-piston engines" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. ...