Robustly stable servo-controlled metering poppet valve
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United States of America Patent
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May 8, 2007
Grant Date -
Mar 15, 2007
app pub date -
Sep 9, 2005
filing date -
Sep 9, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A poppet valve assembly with a control chamber that can be fluidly connected to a number of different hydraulic ports via a pilot valve assembly. The poppet valve assembly includes a poppet valve member whose movement is controlled by filling or draining the control chamber, and which can be hydraulically locked into a given position by fluidly isolating the control chamber from any other hydraulic connections. The poppet valve member includes a control hydraulic surface exposed to fluid pressure in the control chamber. The poppet valve assembly may be part of a valve assembly that includes a plurality of poppet valve assemblies that operably control a hydraulic cylinder connected to an implement of a work machine.
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