SERVO-VALVE A MEMOIRE DE POSITION

摘要

The servovalve comprises an electric motor and a distributor valve integrating a hydraulic slide under the control of said electric motor and further comprising two load channels pierced in a central rod on which blocks are mounted for co-operating with communication orifices of the distributor valve and co-operating with one another and with the ends of the hydraulic slide to define annular chambers including two load chambers connected to the receiver member to be controlled. The two load channels put each of the load chambers into communication respectively with an immediately adjacent annular chamber so as to ensure that the same pressure exists on both sides of the blocks separating said two chambers. In a predetermined safe position (referred to a "fail-freeze" position) in which the blocks close the load orifices with clearance, the leaks through the load orifices that result from the clearance are drained at determined low pressure, thus enabling the drift of the controlled member to be controlled.