In order to ensure constant valve-switching time, irrespective of variations in viscosity, and in order to dampen, to the lowest possible constant level, the noise produced when the valve is operated, the invention proposes that a seal (3) is fitted between the outside surface of the armature (5) and the inside surface of the valve housing (1) and, parallel to the seal, a diaphragm (16) in the armature (5), a permanent hydraulic-fluid connection being established between the hydraulic-fluid chamber (4) in the armature (5) and the hydraulic-fluid space (12) located outside the armature (5).
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