The invention relates to a magnet valve, having a valve insert and a tappet guided movably in the valve insert via a tappet guide, which tappet is braced on a valve body via a restoring spring resting a contact face of the tappet, and the restoring spring is guided radially from inside on one end by a spring guide of the tappet, the spring guide adjoining the contact face. According to the invention, centering means are present, which are disposed on the tappet in such a way that the restoring spring is centered and radially guided from inside over a substantial portion of its length.