A polarized electromagnetic actuator includes a movable armature, a stator, and at least one coil wrapped around the stator. At least one permanent magnet is disposed over the stator. When a current is applied to the at least one coil, the at least one coil is configured to reduce a magnetic flux of at least one permanent magnet in one direction and increase a magnetic flux of at least one permanent magnet in another direction. The movable armature moves in the direction of the increased magnetic flux.

A electromagnetic actuating device for a valve, having an armature arranged in a hollow cylindrical armature chamber axially displaceable between two axial stops, wherein the armature chamber is delimited by a magnet yoke . An electrical coil extends coaxially around the armature, and the magnet yoke is at least partially arranged in a housing. The armature has a cylindrical geometry with a base remote from the housing and with a hollow cylindrical end section situated axially opposite. The base is remote from the housing and connected to an actuating plunger. A guide sleeve is mounted axially onto the hollow cylindrical end section of the armature, and on that end of the guide sleeve which is remote from the actuating plunger, there is arranged or formed an adhesion prevention device which prevents or at least greatly impedes axial adhesion of the armature to the magnet yoke. The guide sleeve makes it possible to realize a reduction in width of the parasitic air gap between the armature and the magnet yoke in order to increase the actuating forces of the actuating device with simultaneously reduced number of components.