Differential area electrohydraulic doser actuator

摘要: A doser type hydraulic actuator includes a pair of unequal area pistons on common shaft which are moved incrementally by injecting into or removing from control pressure chamber metered quantities doses fluid. Doses timed openings solenoid valves connecting the to supply return sources. Special valve means provided for moving piston preferred position in event system failure, and included administering very small consistently without recourse special extra fast response valves.