The present invention relates to a method for adjusting the opening pressure of an implantable valve, in particular for the treatment of hydrocephalus, said valve comprising a rotational axis rotor R whose angular position determines said opening pressure. said rotor comprising a rotor micro-magnet movable between locking and unlocking positions of said rotor, wherein said micro-magnet prohibits and permits rotation of said rotor, respectively, the method comprising the following successive steps: a) provision of a locator for aligning an X axis of a locator housing in the locator with the axis of rotation R of the rotor and for orienting the locator in a predefined angular position about the axis of rotation R； b) determining the angular position of the rotor about its axis of rotation R, relative to the locator； c) inserting an actuator provided with at least one magnet into the locator housing along the X axis to a first insertion depth； d) partially removing said actuator from the locator housing, along the X axis, to a second insertion depth less than the first insertion depth； e) rotating said actuator from the second insertion depth； f) separation of the actuator from the valve. La présente invention concerne un procédé de réglage de la pression d'ouverture d'une valve implantable, notamment destinée au traitement de l'hydrocéphalie, ladite valve comportant un rotor d'axe de rotation R dont la position angulaire détermine ladite pression d'ouverture, ledit rotor comportant un micro-aimant de rotor mobile entre des positions de verrouillage et de déverrouillage dudit rotor, dans lesquelles ledit micro-aimant interdit et autorise la rotation dudit rotor, respectivement, le procédé comprenant les étapes successives suivantes : a) disposition d'un localisateur de manière à aligner un axe X d'un logement de localisateur ménagé dans le localisateur avec l'axe de rotation R du rotor et à orienter le localisateur dans une position angulaire prédéfi
