VARIABLE PITCH PROPELLER CONTROL SYSTEM

A variable pitch propeller control system can have a source of adjustable, actuation hydraulic pressure, a feather valve openable to provide an actuation path of the actuation hydraulic pressure between the source and the actuator, and closeable to connect the actuator to a drain below the actuation hydraulic pressure and close the actuator path, and a bypass path parallel to the actuator path, the bypass path having a restricted flow area relative to a flow area of the actuator path. 可变桨距螺旋桨控制系统可具有：可调节的致动液压压力的源；顺桨阀，其能够打开以在源和致动器之间提供致动液压压力的致动路径，并且能够关闭以将致动器连接到低于致动液压压力的排放部并关闭致动器路径；以及与致动器路径并行的旁通路径，旁通路径具有相对于致动器路径的流动区域的受约束的流动区域。