This actuated ski suspension provides a method of raising and lowering a vehicle to which it is attached by raising and lowering the ski assembly in a vertical plane. It is possible to effectively cope with emission of electromagnetic waves whose frequency increases when the same type of pulses is repeated, so that the electromagnetic waves are out of the recognition range of a user and image quality is prevented from deteriorating. A guide section integrally formed on an end of a valve piece extends into the guide bore for the displaceable guidance of the valve needle in terms of lifting motions.