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.
DUAL VALVE SYSTEMS FOR ACTUATOR CONTROL
DOPPELVENTILSYSTEME ZUR STEUERUNG EINES STELLGLIEDES
SYSTÈMES À DOUBLE SOUPAPE POUR COMMANDE D'ACTIONNEUR
2023-11-01
Patent
Electronic Resource
English