Robert Boschgmbh

Konrad Braunlinger

Joachim Heiser

Roland Schempp

Heinz Flaschar

Hermann Sanzenbacher

Heinz Gand

Klaus Sopha

Heinz Kleinschmidt

Rainer Hoheisel

A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.

Hydraulic control system

Growing community of inventors

Schwieberdingen, Germany

Konrad Braunlinger