Patent ID: 8134439

Claim:
Solenoid for switching pressure controllers or pressure valves, comprising an armature movable in an armature space and a coil impingable by current, the coil generating a magnetic field serving for a movement of the armature when impinged by current, the armature space being fillable with oil, at least one de-airing channel for de-airing the armature space, and a flange located directly at one end of the coil, a backflow-preventing element being provided in a cavity of the flange, the cavity bordering the de-airing channel at the one end of the coil, the backflow-preventing element being a lip seal, the lip seal including a thickening in a direction of air flow, and the thickening being slotted, opposite to a direction of de-airing, the thickening being movable in the de-airing direction of air to allow air to move out of the de-airing channel and said thickening being movable to seal against backflow of air and soiling into the de-airing channel.