PRESSURE CONTROL VALVE
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United States of America Patent
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-
N/A
Issued Date -
Apr 14, 2011
app pub date -
Jun 15, 2010
filing date -
Oct 8, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A pressure control valve is provided, which can variably control the set pressure of the pressure control valve through manipulation of a signal pressure generation device in an operator's seat or the like. The pressure control valve includes a sleeve having an inlet port and a through hole, a poppet slidably coupled in the sleeve, a poppet spring, a pilot poppet draining the hydraulic fluid in a pressure chamber to the hydraulic tank, a valve seat on which the pilot poppet is seated, a pilot poppet spring, a plug coupled to the sleeve, a guide coupled to the plug, a main piston variably adjusting the set pressure of the pressure chamber, a first stopper supporting the pilot poppet spring, a second stopper limiting the movement of the main piston within a predetermined section when the pilot signal pressure passing through the through hole of the guide presses the main piston, an adjustment plug adjusting the set pressure of a spring elastically supporting the main piston, and an adjustment screw adjusting an amount of movement of the main piston by pressing the second stopper when the pilot signal pressure is supplied to the main piston so that pressure in a low-pressure section can be finely controlled.
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