Dampened hydraulic pilot control arrangement for a spool valve
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United States of America Patent
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-
Jan 6, 2015
Grant Date -
Aug 16, 2012
app pub date -
Oct 26, 2009
filing date -
Oct 26, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulic pilot control arrangement for a spool valve is provided, wherein the spool of the spool valve is biased towards a central position. The arrangement includes a first and a second pilot hydraulic line connected to opposite sides of the spool of the spool valve and a pilot pressure regulating arrangement is provided for selectively establishing or removing a pilot pressure in each of the first and second lines. The arrangement includes a damping device including a chamber divided into a first and a second pressure compartment by a sliding piston, the first and second pressure compartments being connected respectively to the first and second pilot hydraulic lines, and the piston is biased towards a rest position in the chamber.
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