Robert Boschgmbh

Heinz Gand

Heinz Flaschar

Heinz Kleinschmidt

Klaus Sopha

Rainer Hoheisel

Joachim Heiser

Roland Schempp

Horst Hesse

Winfried Arnold

Walter Passera, Deceased

Hermann Sanzenbacher

Walter Kobald

Werner Zeuch

Konrad Braunlinger

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

The valve housing of an electromagnetic valve has a bore formed with a valve seat and a pair of fluid ports which communicate with the bore at opposite sides of the valve seat. A valve member is movable in the bore between first and second positions in which the valve member respectively engages and is spaced from the valve seat. The electromagnetic valve also includes an electromagnet which has a portion engageable with the valve member and which is movable between one position and another position in which it respectively permits and prevents movement of the valve member between said first and second positions thereof.

Electromagnetic valve

An electrohydraulic control unit which regulates the flow of hydraulic fluid to and from one or more consumers by way of a directional control valve has a cylinder for a piston which is mechanically connected with or constitutes the spool of the directional control valve and divides the interior of the cylinder into two plenum chambers connected to the outlet of the pump, either directly or by way of a pressure reducing valve. The chambers are further connected with the tank and each of the fluid supplying and evacuating conduits for each of the two chambers contains a flow restrictor. Th flow restrictors in conduits for admission of fluid to the chambers are mounted upstream of check valves and the flow restrictors in conduits for evacuation of fluid from the chambers are mounted upstream of or constitute integral parts of two solenoid-operated auxiliary valves. The four flow restrictors together constitute a hydraulic bridge circuit.

Electrohydraulic control unit

A magnetically-actuated membrane valve for controlling and/or regulating the flow of a liquid medium is described which valve comprises a control membrane fixedly clamped in a valve housing, and an armature frictionally connected with the membrane, which armature is arranged on that side of the membrane which faces away from the exciting coil and from the magnet core of the solenoid, whereby the magnetic flux flows through the membrane, especially for the control of the flow of a liquid which serves as control means in a fuel injection system.

Magnetically-actuated membrane valve

Growing community of inventors

Stuttgart, Germany

Heinz Gand