Hydraulic valve, a hybrid helicopter provided with such a hydraulic valve, and a method implemented by the hydraulic valve

A hybrid helicopter having a fuselage and comprising:

• a rotary wing disposed above the fuselage;
• an auxiliary lift surface having first and second half-wings each extending on a side of the fuselage and each including a propeller;
• a hydraulic valve assembly including:
• a hydraulic valve;
• a control rod configured to be moved in translation along a first longitudinal axis by flight controls of an aircraft;
• a servocontrol;
• an outlet rod configured to be moved in translation along a second longitudinal axis and configured to transfer a hydraulic fluid between the servocontrol and the hydraulic valve;
• and
• a blocker device configured to block a movement of the control rod when a difference between a first movement of the control rod and a second movement of the outlet rod exceeds a predetermined threshold, wherein the blocker device includes at least one moveable abutment configured to block the movement of the control rod when the predetermined threshold is reached and configured to move in longitudinal translation with the outlet rod;
• and a differential lever configured to mechanically link the control rod to the outlet rod and to cooperate with the at least one moveable abutment;
• a mechanical interconnection system disposed between the rotary wing and the propellers;
• and
• at least one turbine engine configured to continuously drive the rotary wing and the propellers in rotation by using the mechanical system.

A method of controlling the hydraulic valve feeding a servocontrol suitable for modifying a pitch of blades of an aircraft propeller, the method comprising:

• providing an assembly including the hydraulic valve and the servocontrol capable of responding to an order from a pilot of the aircraft;
• providing a control rod of the hydraulic valve configured to move in translation along a first longitudinal translation axis using flight controls of the aircraft;
• providing an outlet rod suitable for transferring hydraulic fluid between the servocontrol and the hydraulic valve;
• and
• blocking a movement of the control rod temporarily when a difference between a first movement of the control rod and a second movement of the outlet rod is greater than a predetermined threshold.