| 摘要 |
The invention relates to an improved servo-control valve of the type comprising a torque motor 1 actuated by an electric actuation current for the purpose of slaving the position of a hydraulic directional control slide valve; the servo-control valve in accordance with the invention is equipped with auxiliary magnetic means 16, 17 associated with its torque motor, for the purpose of giving rise to an adjustable independent magnetic field, either in the movable armature 8 of the latter, or in its stationary armature in the region of the air gap. These auxiliary means which may especially be composed of a small magnetised bar 17 mounted rotatably allow the hydraulic flow rate variation law to be modified as a function of the actuation current, with the purpose either of recentring this law or of allowing emergency actuation of the hydraulic flow rate, or even of allowing the gain of the servo-control valve to be adjusted. <IMAGE>
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