Valve spool with cross drill ports
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United States of America Patent
Stats
-
Apr 21, 1987
Grant Date -
N/A
app pub date -
Dec 7, 1984
filing date -
Dec 7, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A four-way valve is provided, for selectively interconnecting pressure supply and return lines with control pressure lines of a hydraulic device, having means for independently balancing the valve against pressures exerted on the valve by any one or more of the pressure lines and at any operating position of the valve. These pressures exerted on the valve would otherwise restrict or prevent actuation of that valve. This balancing means exposes a minimum surface area of the valve to high pressure forces and isolates the fluid pressure in the pressure lines until interconnection is made by valve actuation.
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Family
International Classification(s)
Cited Art Landscape
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