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From 1973, compressors were produced for North America on Long Island (New York) under the name Engineering Dental Industry. The year 1974 welcomed the introduction of the dry air unit for compressors for the protection of dental instruments from oxidation and from the growth of microorganisms in the pressure tank.
www.durr-group.com Dürr AG is a global mechanical and plant engineering firm. The company, founded by Paul Dürr (1871–1936) as a metal shop for roof flashing in Bad Cannstatt in 1895, has been listed on the Frankfurt Stock Exchange since 4 January 1990.
Principal view of the pumping action of a twin-screw pump with a six-lobe female screw and a five-lobe male screw. A compressor (as opposed to a pump) would be shaped the same way, except that the shape of the lobes would change along the length of the screw, so that the volume of the trapped pockets would get squeezed smaller as they get closer to the exhaust port.
An air compressor is a specific type of gas compressor. Many compressors can be staged, that is, the gas is compressed several times in steps or stages, to increase discharge pressure. Often, the second stage is physically smaller than the primary stage, to accommodate the already compressed gas without reducing its pressure.
[1] [2] Because of this phenomenon, compressed air systems usually benefit from the addition of a compressed air dryer located on the output of the air compressor and/or at various locations throughout the distribution system. In most cases, the output of the compressor is processed through a primary dryer or system dryer.
Air turbine used in a dental handpiece Correlation between rotational speed and torque Correlation between rotational speed and turbine output power. The turbine is powered by compressed air between 35 and 61 pounds per square inch (~2,4 to 4,2 bar), [1] [2] which passes up the centre of the instrument and rotates a Pelton wheel in the head of the handpiece.