The invention discloses an intelligent self-checking electro-hydraulic
servo valve. An existing electro-hydraulic
servo valve does not have a function of monitoring the using condition of a valve element and does not have an
oil pressure self-adaption function. The intelligent self-checking electro-hydraulic
servo valve comprises a valve body, a
torque motor, an armature, a servo valve controller, a double-
nozzle baffle, a pressure
transmitter, a feedback rod, an LVDT displacement sensor, a displacement sensor circuit, a sliding valve
assembly and a throttling hole opening adjusting
assembly. The position of the sliding valve
assembly is controlled through the
torque motor, the armature, the double-
nozzle baffle and the feedback rod, and the position of the sliding valve assembly is fed back through the LVDT displacement sensor and the displacement sensor circuit. When a fault occurs to the intelligent self-checking electro-hydraulic servo valve, a position feedback centering sliding valve can be controlled to be in a
safe operation state; an upper computer can predict the service life according to position feedback of an
electrostatic induction sensor in the sliding valve assembly; and when abrasion of the position feedback centering sliding valve reaches a set value, the
position error of the position feedback centering slide valve can be compensated by adjusting the size of a throttling hole of the throttling hole opening adjusting assembly.