Fail-safe servovalve system

Details Fail-safe servovalve system Fail-safe servovalve system

1985-04-01

1989-02-21

Nelli, Raymond A.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

91509, 91 3, F15B 1302, F15B 1517

Patent

active

048055158

ABSTRACT:
In one form of the present invention, a plurality of serovalves are connected to a common manifold. The manifold transmits fluid pressure from the servovalves to a modulator piston which controls the fluid pressure applied to a hydraulic actuator piston. The servovalves are designed such that, if the fluid pressure provided by any one of them to the manifold falls below a threshold, then the servovalve disconnects itself from the manifold, allowing control of the modulator piston to be assumed by the remaining, functioning servovalves. The present invention can be used in control surface actuators of short takeoff and landing (STOL) aircraft.

REFERENCES:
patent: 3257911 (1966-06-01), Garnjost et al.
patent: 3488029 (1970-11-01), Durbin
patent: 3789736 (1974-02-01), Williams
patent: 4143583 (1979-03-01), Baur et al.
patent: 4155288 (1979-05-01), Glaze
patent: 4276809 (1981-07-01), Kast
patent: 4470337 (1984-09-01), Kast
patent: 4538504 (1985-09-01), Kast

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