Differential area electrohydraulic doser actuator
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United States of America Patent
Stats
-
Mar 17, 1981
Grant Date -
N/A
app pub date -
Apr 5, 1979
filing date -
Apr 5, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A doser type hydraulic actuator includes a pair of unequal area pistons on a common shaft which are moved incrementally by injecting into or removing from a control pressure chamber metered quantities or doses of fluid. Doses are metered by timed openings of solenoid valves connecting the control pressure chamber to supply or return pressure sources. Special valve means are provided for moving the actuator piston to a preferred position in the event of control system failure, and means are included for administering very small doses consistently without recourse to special extra fast response solenoid valves.
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Cited Art Landscape
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