Danfoss A/s

Sauer Danfoss Aps

Sauer-danfoss (nordborg) A/s

Sauer-danfoss Holding A/s

Danfoss Fluid Power A/s

Sauer-danfoss (nordberg) A/s

Danfors A/s

Siegfried Zenker

Thorkild Christensen

Carsten Christensen

Svend Erik Thomsen

Erik Plauborg

Jens Jo Nielsen

Poul Ennemark

Welm Friedrichsen

Erik Haugaard

Carl Christian Dixen

Harry S Nissen

Verner Smidt

Lasse Nicolai Langmaack

Helge Jorgensen

Anders Valbjo Slashedrn

The invention concerns a hydraulic valve arrangement () with a supply connection arrangement comprising a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement comprising two working connections (A, B), which can be connected to a motor (), a directional valve arrangement () located between the supply connection arrangement (P, T) and the working connection arrangement (A, B), and a compensation valve () acted upon in a first activation direction by a pressure in a first pressure chamber (), which is connected to a load-sensing pipe (LS), and, if required, by a spring (), and in a second activation direction opposite to the first activation direction by a pressure downstream of the directional valve arrangement (), said pressure acting in a second pressure chamber (), the compensation valve () having an inlet () and an outlet (). In connection with a post-compensated valve, it is endeavored to adjust the load pressures at the working connections (A, B) in dependence of the direction. For this purpose, each working connection (A, B) is connected to a control system, which amplifies the effect of the pressure in the first pressure chamber () on the compensation valve () in dependence of a pressure ruling at the working connection (A, B).

Hydraulic valve arrangement

The invention concerns a valve arrangement () comprising a flow path () connecting an inlet () and an outlet (), a closing means () arranged in said flow path (), a resetting means and a first pressure in a first pressure chamber () acting in a closing direction on said closing means (), a pressure of said outlet () and a second pressure in a second pressure chamber () corresponding to a pressure of said inlet () when said closing means () is closed acting in opening direction on said closing means (), said first pressure chamber () being connectable to the outlet () via an auxiliary valve (). It is intended to keep small a pressure pulse when opening the valve arrangement (). This is achieved in that the closing means () having a first opening state (A) and a second opening state (B), a flow resistance of said closing means () in said first opening state (A) being larger than a flow resistance of said closing means in said second opening state (B).

Valve arrangement

The invention concerns a hydraulic valve arrangement () with at least two valve modules (-), each having a supply channel arrangement with a high-pressure channel () and a low-pressure channel (), a working connection arrangement with at least one working connection (A, B), one directional valve arrangement () between the supply channel arrangement () and the working connection arrangement (A, B) and a compensation arrangement (), which is acted upon by a pressure in a load-sensing arrangement. It is endeavored to increase the number of control possibilities. For this purpose, the load-sensing arrangement of at least one valve module (-) has a pressure influencing arrangement (-) that differs from a pressure influencing arrangement (-) of a load sensing arrangement of another valve module (-).

The invention concerns a hydraulic valve arrangement () with several valve modules (-), each having a supply channel arrangement with a high-pressure channel () and a low-pressure channel (), a working connection arrangement with at least one working connection (A, B), a directional valve arrangement () between the supply channel arrangement and the working connection arrangement and a compensation arrangement (). It is endeavoured to improve the control possibilities. For this purpose, it is provided that in at least one valve module () the compensation arrangement is a pre-compensation arrangement () and in at least one other valve module () the compensation arrangement is a post-compensation arrangement ().

The invention concerns a hydraulic valve arrangement with a supply connection arrangement, which has a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, which has two working connections (A, B), which can be connected with a consumer, a directional valve and a compensation valve arranged between the directional valve and the supply connection arrangement, the pressure outlet of the compensation valve being connected with a pressure inlet of the directional valve. It is endeavoured to avoid dangerous situations, which occur because of uncontrolled pressures. For this purpose, it is ensured that the compensation valve has a relief outlet, which can be connected with the pressure outlet.

A hydraulic valve system () has a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, having two working connections (A, B) connectable with a motor (), with a directional valve (), which is arranged between the supply connection arrangement (P, T) and the working connection arrangement (A, B), and with a compensation valve (), which is acted upon in a first operation direction by a spring () and a pressure in a pressure chamber (), which is connected with a load-sensing line (LS), and in a second operation direction, which is opposite to the first operation direction, by a pressure at the directional valve ().

Hydraulic valve system

A hydraulic valve system ( ) has a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, having two working connections (A, B), which can be connected with a hydraulic motor ( ), and a directional valve ( ) between the supply connection arrangement (P, T) and the working connection arrangement (A, B), which is connected with the working connection arrangement (A, B) via working lines ( ), in which are arranged check valves ( ), which can be opened by means of pressure.

The invention concerns a hydraulic dual circuit steering system with first circuit having a first control unit and a first steering motor connected with the control unit via working connections, a second circuit having a second control unit and a second steering motor connected with the control unit via working connections, a changeover valve, which in a first position activates the first circuit and deactivates the second circuit and in a second position activates the second circuit and deactivates the first circuit. To improve the steering behaviour, in the first position of the changeover valve the working connections of the second circuit and in the second position of the changeover valve the working connections of the first circuit are connected with a pressure source.

Hydraulic dual circuit steering system

A hydraulic valve arrangement includes a control valve ( ), which, in a first operating position ( ), connects a motor connection ( ) with a pump connection, in a second operating position ( ), connects a motor connection with a tank connection, and, in a locking position ( ), disconnects the motor connection ( ) from the pump and tank connection. A locking valve ( ) is coupled between the control valve ( ) and the motor connection ( ), dividing the motor line ( ) into a first section ( ) allocated to the control valve ( ) and a second section ( ) allocated to the motor connection ( ). For the locking valve ( ), a pressure release valve ( ) in the shape of a seated valve is provided that is fixed to the housing thereby improving control accuracy.

The invention concerns a hydraulic line coupling arrangement of a consumer, with a pump line, a tank line and a safety valve in the pump line, the valve element of the safety valve being acted upon in the opening direction by an opening pressure from the pump line and in the closing direction by a closing pressure of a closing pressure connection. In such an arrangement it is desired to prevent overloading of the consumer. For this purpose, a pilot valve is provided for controlling the closing pressure, the position of the pilot valve being controlled by the pressure in the tank line.

Hydraulic line coupling arrangement

The invention concerns a hydraulic valve arrangement with locking function. It has a control valve ( ), which in two operating positions ( ) connects one motor connection (A) with a pump connection and a second motor connection (B) with a tank connection and vice versa, and in a locking position ( ) separates both motor connections (A, B) from pump and tank connection. Further, there are two lock valves ( ), each connected between the control valve ( ) and one of the motor connections (A, B). This valve arrangement is characterised in that for each lock valve ( ) a pressure release valve ( ) is provided, whose operating member ( ) is loadable in the closing direction by a first chamber pressure and an additional force acting in a first chamber ( ) and in the opening direction by a control pressure acting in a second chamber ( ), and that the control pressure in dependence of the position of the control valve ( ) has a lower value, which is equal to the first chamber pressure, and an upper value, which exceeds the first chamber value by such a value that the oppositely acting closing force is overcome. This gives a very high degree of operation safety.

Hydraulic valve arrangement with locking function

A hydraulic valve arrangement with locking and floating function, with a control valve (,), which, for two operating positions (,) connects one motor connection (A) with a pump connection and a second motor connection (B) with a tank connection and vice versa, in a floating position (,) connects both motor connections (A, B) with the tank connection and in a locking position (,) separates both motor connections (A, B) from the pump and tank connections. Further, there are two closing valves (,), each being connected between the control valve (,) and a motor connection (A, B) and each having a piston loaded by a spring and limiting a spring chamber, the spring chambers being pressure releasable. Characteristic of this valve arrangement is that lifting valves (,) are provided for the pressure release, which valves are operated by a control pressure depending on the position of the control valve (,). This improves the operating reliability.

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Kirchseeon, Germany

Siegfried Zenker