Hydraulic valve assembly with a pressure compensated directional spool valve and a regeneration shunt valve
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United States of America Patent
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Feb 10, 2009
Grant Date -
Mar 27, 2008
app pub date -
Sep 27, 2006
filing date -
Sep 27, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic circuit controls flow of fluid between first and second ports of a hydraulic actuator, such as a cylinder/piston arrangement and each of a supply conduit and a tank return conduit. The hydraulic circuit operates in standard powered operating modes as well as powered and unpowered regeneration modes. In a powered operating mode, a conventional pressure compensated spool valve determines the velocity of the hydraulic actuator. A workport blocking valve connects one workport of the spool valve to the first port and the other workport is connected to the second port. A regeneration shunt valve is directly connected between the first and second ports of the hydraulic actuator. In a regeneration operating mode or a mix of powered and regeneration modes, a combination of the spool valve, the workport blocking valve, and the regeneration shunt valve determines the velocity of the hydraulic actuator.
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