Hydraulic system with a cylinder isolation valve
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United States of America Patent
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Aug 12, 2008
Grant Date -
Feb 7, 2008
app pub date -
Aug 2, 2006
filing date -
Aug 2, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic system provides failure protection by incorporating an isolator adjacent a hydraulic actuator. The isolator has a first port connected to the hydraulic actuator and a second port with an electrically operated isolation valve connected between those ports. A pressure relief valve responds when pressure in the hydraulic actuator exceeds a given level by relieving pressure thereby enabling the isolation valve to open without application of electricity and release the pressure in the hydraulic actuator. A control valve assembly is remote from the hydraulic actuator and connected to the second port for metering flow of fluid between a source and the hydraulic actuator.
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