Mannesmann Rexroth Corporation

Mannesmann Rexroth Ag

Jacques Maffini

Thomas Weickert

Werner Herfs

Rainer Napfel

The invention concerns a hydraulic control circuit in which the pressure medium conveyed by a hydraulic pump of variable delivery (,) is fed, in each case via a metering aperture (,), as a priority to a first hydraulic consumer (,) and only secondly to a second hydraulic consumer (,). A priority control system is now produced without additional delivery losses and with sufficient amounts of pressure medium being conveyed in that the valve member (,) of the priority valve (,) can be acted upon in the closure direction of the connection between the first connection (,) and the second connection (,) by a pressure prevailing in a line section (,) upstream of the first metering aperture (,).

Hydraulic control circuit for a priority and for a secondary hydraulic consumer

The invention relates to a valve system for supplying fluid from a pair of fluid pressure sources to a load. A feed valve is provided which feeds--when required--a partial flow of the second fluid pressure source into the feed line of the load which is connected to the first fluid pressure source through a directional control valve. The feed valve comprises a pressure-compensating valve to control the volume of the partial flow and a switching valve to automatically open the pressure-compensating valve when required.

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Lohr/Main, Germany

Jacques Maffini