A device for controlling a propeller, having variable-pitch blades, of a turboprop engine, has a first hydromechanical device for controlling the pitch of the blades of the propeller and a second hydromechanical device for controlling the speed of rotation of the propeller. The device includes a single electromechanical actuator with a movable actuator member mechanically connected both to the first hydromechanical device for controlling the pitch, in order to manage the pitch setpoint, and to the second hydromechanical device for controlling the speed, in order to manage the speed setpoint.

A device for controlling a propeller, having variable-pitch blades, of a turboprop engine, has a first hydromechanical device for controlling the pitch of the blades of the propeller and a second hydromechanical device for controlling the speed of rotation of the propeller. The device includes a single electromechanical actuator with a movable actuator member mechanically connected both to the first hydromechanical device for controlling the pitch, in order to manage the pitch setpoint, and to the second hydromechanical device for controlling the speed, in order to manage the speed setpoint.

A system for automatically coordinating a direction of travel with a position of a turret rotatably mounted on an undercarriage of a hydraulic machine including a hydraulic transmission circuit for connecting a main pump to a bi-directional hydraulic travel motor. The circuit includes a travel control distributor able to vary a driving direction of the motor. The system includes a second hydraulic circuit disposed downstream of a pilot pump providing a pilot pressure. The second circuit includes: a valve controller for controlling a direction of travel, activatable by the operator and able to switch the control distributor by sending different command signals; and a reversing valve, interposed between the valve controller and the control distributor. The system further includes a coordination circuit able to switch or maintain the reversing valve according to the position of the turret and to the command signals.

A system for automatically coordinating a direction of travel with a position of a turret rotatably mounted on an undercarriage of a hydraulic machine including a hydraulic transmission circuit for connecting a main pump to a bi-directional hydraulic travel motor. The circuit includes a travel control distributor able to vary a driving direction of the motor. The system includes a second hydraulic circuit disposed downstream of a pilot pump providing a pilot pressure. The second circuit includes: a valve controller for controlling a direction of travel, activatable by the operator and able to switch the control distributor by sending different command signals; and a reversing valve, interposed between the valve controller and the control distributor. The system further includes a coordination circuit able to switch or maintain the reversing valve according to the position of the turret and to the command signals.

The invention relates to a flap actuator, in particular to a servo/spoiler actuator, comprising at least one electrohydraulic servo valve and at least one actuator which are hydraulically connected to one another, wherein the actuator comprises at least one actuator housing in and/or at which the at least one channel is arranged by means of which one or more components, preferably likewise arranged in and/or at the actuator housing, are hydraulically connected and wherein no valve block is arranged between the actuator and the servo valve.