ZERO LEAKAGE BALANCE VALVE SYSTEM
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United States of America Patent
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N/A
Issued Date -
Oct 30, 2008
app pub date -
Apr 24, 2007
filing date -
Apr 24, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A valve assembly for a hydraulic device. The valve assembly has a valve seat within a valve passageway used in combination with a spool. The spool has a first section wherein a flexible element is disposed within a cavity of the first section such that in a first position the spool and specifically the flexible element engages the valve seat to provide zero leakage from the valve passageway into a tank passageway. Additionally, the spool is designed to have an additional section at a second end to provide equal sealing areas at both the first and second ends of the spool to balance the forces within the valve passageway.
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