Electromagnetic valve, in particular for hydraulic brake systems with slip control

Claim 1

An electromagnetic valve, comprising: a housing including a valve seat, a magnetic coil disposed within said housing, a magnet core disposed within said magnetic coil and including a stepped bore, a magnet armature disposed adjacent the magnetic core within said magnetic coil and including a stepped bore, a non-ferro magnetic anti-stick disc with an aperture therethrough and disposed between the magnet armature and the magnet core, a magnet armature spring functionally disposed between the magnet core and the magnet armature, wherein said magnet armature performs a stroke movement toward the core, overcoming the spring, in response to an electric current directed through said magnetic coil, a valve needle having a first spring stop and slidably disposed within said stepped bores of said magnetic armature and said core, and a valve spring disposed between the first spring stop of the valve needle and a second spring stop of the armature biasing the valve needle toward the seat, wherein said stepped bore extends over nearly the entire length of said magnet armature and in an end range of said magnet armature encircles said valve needle and guides said valve needle, and further wherein when the first spring stop seats against a valve stop of the armature then the armature spaced from the core by an amount greater than a thickness of the disc and when the armature is disposed against the disc and the valve needle is fully seated in said valve seat then the first spring stop is spaced from the valve stop.