Hydraulic energy storage system with accumulator and method of varying charge of same
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United States of America Patent
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May 29, 2012
Grant Date -
Aug 5, 2010
app pub date -
Jan 30, 2009
filing date -
Jan 30, 2009
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Abstract
A method of varying a charge in an accumulator includes providing an accumulator containing working fluid and gas, providing a reservoir containing gas, transferring gas from the reservoir to the accumulator to increase the gas pressure in the accumulator, and transferring gas from the accumulator to the reservoir to decrease the gas pressure in the accumulator.
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