DUAL VALVE SYSTEMS FOR ACTUATOR CONTROL

A system for controlling propeller pitch in the event of electro-hydraulic servo valve (EHSV) failure can include an actuator (101) and a selection valve (123) in fluid communication with the actuator. The selection valve can be fluid communication with a first EHSV (109) having a first null state b...

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Bibliographische Detailangaben
1. Verfasser:	MAVER, Timothy
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AEROPLANES AIRCRAFT AVIATION BLASTING COSMONAUTICS DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HEATING HELICOPTERS HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A system for controlling propeller pitch in the event of electro-hydraulic servo valve (EHSV) failure can include an actuator (101) and a selection valve (123) in fluid communication with the actuator. The selection valve can be fluid communication with a first EHSV (109) having a first null state bias configured to bias the actuator to an increased-pitch position, and a second EHSV (111) having a second null state bias configured to bias the actuator to a decreased-pitch position. The selection valve can be configured to selectively allow fluid communication between one of the first EHSV and actuator and/or the second EHSV and the actuator.