Patent ID: 7093778

Claim:
A device to deliver a free-flowing medium, comprising: a drive housing defining a delivery direction of the free-flowing medium; a magnet coil disposed within the drive housing, the magnetic coil being constructed to generate a magnetic flux in an energized state; an axially movable armature device disposed within the magnet coil, the axially movable armature device comprising at least first and second armature elements, the armature elements being disposed a predetermined distance from one another in the delivery direction, the armature elements defining first and second faces; and an armature cylinder disposed within the magnet coil adjacent to the armature elements, the armature cylinder comprising at least first and second elements constructed to interrupt the magnetic flux, wherein the first and second flux-interrupting elements are disposed adjacent to first and second lands, and wherein the first and second lands are disposed first and second predetermined distances from the first and second faces of the armature elements to establish first and second gaps that interrupt magnetic flux, thereby establishing the magnetic flux at least within the armature cylinder, the armature elements, and the drive housing.