Danfoss Power Solutions Aps

Dirk Wroblewski

Frede Callesen

Kjeld Ravn

A control arrangement () of a hydraulic system () is provided, said control arrangement () comprising a supply port arrangement having a high pressure port () and a low pressure port (), a working port arrangement having two working ports (), a first valve () arranged between said high pressure port () and said working port arrangement (), a second valve () arranged between said low pressure port () and said working port arrangement (). Such a control arrangement should enhance the control of a hydraulic system. To this end a controller () is provided for controlling said first valve () and said second valve (), said controller () has an input connection () for receiving a signal of an operator input device and on the basis of said signal said controller at least initially calculates an unbalance between a first flow demand for said first valve () and a second flow demand for said second valve (), and adjusts said first valve () according to said first flow demand and said second valve () according to said second flow demand.

Control arrangement of a hydraulic system and a method for controlling a hydraulic system

An electrohydraulic control valve () comprising a control valve element () displaceable in a first direction by a pressure in a first pressure chamber () and in a second direction by a pressure in a second pressure chamber (). Each pressure chamber () is connected to a line between a high pressure port (PP) and a low pressure port (PT) via a magnetic valve (). Each magnetic valve () is a three-way valve and comprises a first valve seat () and a second valve seat (). A space () between the first valve seat () and the second valve seat () is connected to the pressure chamber () and a first valve element () positioned outside the space () cooperates with the first valve seat () and a second valve element () positioned outside the space () cooperates with the second valve seat ().

Electrohydraulic control valve

A hydraulic valve arrangement () is provided comprising comprising a supply port arrangement having a high pressure port () and a low pressure port (), a working port arrangement having two working ports (), a first valve () arranged between said high pressure port () and said working port arrangement (), a second valve () arranged between said low pressure port () and said working port arrangement (), a controller () for controlling said first valve () and said second valve (), said controller () having an input connection () for receiving a signal of an operator input device, and a regenerative flow path which can be established by means of at least one of said first valve () and said second valve (). The function of such a hydraulic valve arrangement should be enhanced. To this end said controller () said controller interrupts said regenerative flow path when a feed pressure at said working port arrangement () exceeds a predetermined pressure level.

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Flensburg, Germany

Dirk Wroblewski