초록 ▼

A fail-safe second stage valve for controlling actuator movement upon power loss in a multiplexed fluid power control system. The second stage valve is interposed between a corresponding actuator and a fluid multiplexer to operate generally as integrating or amplifying device which regulates flow to

A fail-safe second stage valve for controlling actuator movement upon power loss in a multiplexed fluid power control system. The second stage valve is interposed between a corresponding actuator and a fluid multiplexer to operate generally as integrating or amplifying device which regulates flow to the actuator. The second stage valve is provided with a dampening mechanism in the form of a bleed port to reduce fluid flow to the actuator. The bleed port bleeds off accumulated fluid received by the second stage valve over a predetermined range of valve positions. This changes the position of the valve and thereby reduces flow rate to the actuator. The multiplexed fluid power control system using the fail-safe second stage valve controls the flow to the corresponding actuator upon electrical power loss. The actuator may be used to open and close variable stator vanes in an aircraft gas turbine engine.

대표청구항 ▼

[ What is claimed is:] [1.] A multiplexed fluid power control system for individually controlling the positions of a plurality of actuators, comprising the combination of:a fluid multiplexer having an input and a plurality of outputs, the multiplexer having a plurality of positions, each position fl

[ What is claimed is:] [1.] A multiplexed fluid power control system for individually controlling the positions of a plurality of actuators, comprising the combination of:a fluid multiplexer having an input and a plurality of outputs, the multiplexer having a plurality of positions, each position fluidically connecting one of the outputs to the input;a fluid control adapted to produce a controlled output flow through the input;a second stage valve having a control chamber connected to one of the outputs, the second stage valve producing an output flow to an associated actuator determined by an accumulation of fluid received in the control chamber from the respective output; anda bleed port fluidically connecting the control chamber to a fluid source when said accumulation reaches a predetermined magnitude, the fluid source having a fluid pressure that is different than the pressure in the control chamber, wherein fluid flow through the bleed port modifies the accumulated amount of fluid in the control chamber and thereby the output flow to the associated actuator.