Treatment device having - an implantable valve having: - a body defining an internal chamber, - an admission conduit and a discharge conduit that are formed in the side wall of said internal chamber and are able to be connected, respectively, to a liquid delivery catheter and a liquid drainage catheter, - a rotor able to turn in said internal chamber about an axis of rotation, the rotor having at least one micro-magnet movable between positions of locking and unlocking of the rotor, in which positions it respectively prohibits and permits the rotation of said rotor, a rotation of the rotor modifying the opening pressure of the valve, - a shutter, - an elastic return member compressing the shutter in its seat in such a way as to regulate and, if appropriate, block the passage of liquid into the internal chamber, - a device for adjusting the opening pressure of said valve, the treatment device being characterized in that the adjustment device has: - a valve locator defining a locator receptacle of axis X; - a key having an actuator with an actuator magnet, the actuator being insertable, along the axis X, into the locator receptacle to a first insertion depth and to a second insertion depth less than the first insertion depth, the adjustment device having a guide (52, 54) for guiding the rotation of the actuator about the axis X from at least one angular position of the actuator about the axis X in which the actuator is at the second insertion depth, the actuator magnet exerting a magnetic field designed, when the locator is placed against the skin of a patient under which the valve has been implanted, the valve being placed in a window of the locator, to unlock the rotor at the first insertion depth and to be rotationally coupled to the rotor at the second insertion depth. - an implantable valve having: - a body defining an internal chamber, - an admission conduit and a discharge conduit that are formed in the side wall of said internal chamber and are able to be connected, respectively, to a liquid delivery catheter and a liquid drainage catheter, - a rotor able to turn in said internal chamber about an axis of rotation, the rotor having at least one micro-magnet movable between positions of locking and unlocking of the rotor, in which positions it respectively prohibits and permits the rotation of said rotor, a rotation of the rotor modifying the opening pressure of the valve, - a shutter, - an elastic return member compressing the shutter in its seat in such a way as to regulate and, if appropriate, block the passage of liquid into the internal chamber, - a body defining an internal chamber, - an admission conduit and a discharge conduit that are formed in the side wall of said internal chamber and are able to be connected, respectively, to a liquid delivery catheter and a liquid drainage catheter, - a rotor able to turn in said internal chamber about an axis of rotation, the rotor having at least one micro-magnet movable between positions of locking and unlocking of the rotor, in which positions it respectively prohibits and permits the rotation of said rotor, a rotation of the rotor modifying the opening pressure of the valve, - a shutter, - an elastic return member compressing the shutter in its seat in such a way as to regulate and, if appropriate, block the passage of liquid into the internal chamber, - a device for adjusting the opening pressure of said valve, - a valve locator defining a locator receptacle of axis X; - a key having an actuator with an actuator magnet, the actuator being insertable, along the axis X, into the locator receptacle to a first insertion depth and to a second insertion depth less than the first insertion depth, the adjustment device having a guide (52, 54) for guiding the rotation of the actuator about the axis X from at least one angular position of the actuator about the axis X in which the actuator is at the second insertion depth,