Pilot plant (20) of a servo-valve (100), the pilot plant (20) consisting of a hydraulic element (30) to eject a fluid jet and a hydraulic element (6) to receive the fluid jet , the hydraulic elements (30, 6) being able to be displaced with respect to each other to modify their relative position and thus generate a pressure differential, one of the fixed hydraulic elements (6) being mounted on a body (1) of the servo-valve (100) and the other of the hydraulic elements (30) being connected to a movable element (21) of the pilot plant (20) movable with respect to a body of the servo-valve (100) by actuation means (40), the actuation means (40) comprising a first piezoelectric actuator (41) and a second piezoelectric actuator (42) mounted in series, characterized in that, the maximum elongation (Amax41) of the first piezoelectric actuator (41) is substantially equal in the middle of the elongation maximum input (Amax42) of the second piezoelectric actuator (42).
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