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HYDAC is a German company group that specializes in the production and distribution of components and systems as well as services related to hydraulics and fluidics. Hydac is constituted of 15 legal entities, [ 2 ] all of which are GmbHs , companies with limited liabilities.
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[note 1] An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations. It is a type of energy storage device. Compressed gas accumulators, also called hydro-pneumatic accumulators, are by far the most common type.
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Gas cushion (spring) pre-filled accumulators of liquids are called hydropneumatic accumulators. "Hydro" because a liquid (like water) is involved. "Pneumatic" because a gas (like air) is involved. "Accumulator" because the purpose is to store or accumulate liquid volume by easy compression of the gas.
Hydraulics and other studies [1] An open channel, with a uniform depth. Open-channel hydraulics deals with uniform and non-uniform streams. Illustration of hydraulic and hydrostatic, from the "Table of Hydraulics and Hydrostatics", from Cyclopædia, or an Universal Dictionary of Arts and Sciences, edited by Ephraim Chambers, 1728, Vol. 1
The company was set up by an Act of Parliament (the London Hydraulic Power Act 1884), sponsored by railway engineer Sir James Allport, [1] [a] to install a network of high-pressure cast iron water mains under London.
Jean Mercier (1901–1971), a Frenchman, was known as the father of the bladder-type hydraulic accumulator. [1] Mercier fled France for the United States during the Nazi invasion, eventually settling in New York City. After meeting Edward M. Greer in 1940, the two founded Greer Hydraulics (in 1942) to produce aircraft hydraulic components.