LIQUID-PRESSURE CONTROL DEVICE
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United States of America Patent
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Issued Date -
Oct 15, 2015
app pub date -
Oct 30, 2013
filing date -
Oct 30, 2012
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Abstract
A liquid-pressure control device includes a switching valve, a manipulation valve, a first back pressure output mechanism, and a second shuttle valve. When a manipulation lever is manipulated, the manipulation valve outputs a first output pressure corresponding to a manipulation amount of the manipulation lever. When a predetermined operation state is satisfied, the first back pressure output mechanism outputs a first back pressure. The first output pressure is input as a first pilot pressure to the switching valve, and the first back pressure is input as a second pilot pressure to the switching valve. The switching valve supplies a liquid pressure to a boom cylinder at a flow rate corresponding to a differential pressure between the first and second pilot pressures.
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