Differential area electrohydraulic doser actuator

Details Differential area electrohydraulic doser actuator Differential area electrohydraulic doser actuator

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F01B 7/18 (2006.01) F15B 11/12 (2006.01) F15B 11/13 (2006.01) F15B 20/00 (2006.01) F15B 13/04 (2006.01)

Patent

CA 1123709

140-770060 DIFFERENTIAL AREA ELECTROHYDRAULIC DOSER ACTUATOR ABSTRACT OF THE INVENTION 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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