Valve device
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United States of America Patent
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Aug 25, 2015
Grant Date -
Nov 15, 2012
app pub date -
Jan 15, 2011
filing date -
Jan 21, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A valve device includes a valve housing (2) and a valve piston (4) axially displaceably in a housing bore (3). By valve piston movement, load connections (A, B) can alternately be connected to a pressure connection (P) and to a tank connection (T1, T2) by solenoid magnets (5, 6). Pilot control chambers (8, 10) pressurize piston back sides (9, 11). The control chambers (8, 10) are connectable via fluid-conducting connections (12, 13) to the pressure connection (P). Pilot control pistons (14, 15) release or close fluid-conducting connections (16, 17) between control chambers (8, 10) and the tank connection (T1, T2). One pilot control piston (14, 15) includes a ring channel (19) controlling a fluid-conducting connection (16, 17) between a pilot control chamber (8, 10) and a tank connection (T1, T2).
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