Robert Boschgmbh

Gerhard Hahl

Dirk Hofmann

Valentin Schubitschew

Hans-Friedrich Schwarz

The valve ( ) has a seat valve ( ) comprising a hollow cone-shaped valve seat ( ) and an hemispherical shutoff element ( ). An afflux bore ( ) having contact with a pressure-medium inlet ( ) discharges centrically into the valve seat ( ). A solenoid armature ( ) acting upon the seat valve ( ) in opening fashion grips a push rod ( ) comprising the shutoff element ( ). The solenoid armature cooperates with a pole body ( ) according to the flat-type armature principle. A preloaded return spring ( ) acting on the seat valve ( ) in closing fashion is arranged between the pole body ( ) and the solenoid armature ( ). The valve ( ) works as a proportioning valve, because, in addition to a suitable design of the seat valve ( ) and push rod ( ), the magnetic force is infinitely variable and, together with a hydraulic force, has a monotonously increasing course as the valve opening stroke increases, while the spring force&mdash;which also has a monotonously increasing course as the valve opening stroke increases&mdash;has a positive slope that is greater than that of the course of the magnetic and hydraulic force.

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Korntal-Muenchingen, Germany

Gerhard Hahl