Robert Boschgmbh

Brueninghaus Hydromatik Gmbh

Hakan Camurdan

Guenter Wanschura

Juergen Gintner

Markus Gepraegs

Johann Wuchenauer

Michael Schuette

Ulrich Schill

Alexander Patrick Steiner

Christian Frick

Hermann Schuele

Stephan Rohde

Stefan Rundstadler

Karthikeyan Maharajan

A pressure relief valve assembly includes a pressure relief valve having a valve bushing received in a valve bore of a housing bore, and a valve body biased against a valve seat by a spring guided in the valve bushing. The valve body includes first and second control surfaces subjected in an opening direction, respectively, to a pressure to be limited and to a control pressure. A fixing device disposed on the valve bushing axially supports the valve bushing in the housing bore. The valve bushing has a radially protruding sealing collar which sits against a peripheral wall of the housing bore and seals an annular chamber carrying the pressure to be limited against an annular control chamber carrying the control pressure. Both the chamber and the control chamber are radially delimited on one side by the housing bore and on the other side by the valve body.

Pressure relief valve assembly, modular pressure relief valve assembly, and hydraulic control assembly having such a pressure relief valve assembly

A hydraulic drive for a drilling apparatus includes a hydraulic motor that drives a drill and is connected to a main pump via a first and a second working line in a closed hydraulic circuit. The main pump has a steplessly adjustable displacement volume that is adjustable by an actuating cylinder that is connected to a control valve, which has a first feed connector and a first return connector. The first feed connector is connected to an outlet connector of a pressure reducing valve such that the pressure at the feed connector is adjustable to a predefined setpoint pressure by means of the pressure reducing valve. The setpoint pressure is set in a manner which is dependent on a desired high pressure in the closed circuit.

Hydraulic drive in front of a drilling apparatus

A pressure-maintaining valve arrangement of a purge circuit of a closed hydraulic circuit includes a pressure-maintaining valve configured to be shut off via a pilot valve. In one embodiment, a control pressure chamber, acting in the closing direction, of the pressure-maintaining valve is configured to be relieved via the pilot valve to a tank, and the pressure-maintaining valve is closed via a spring acting in the closing direction. In another embodiment, the valve arrangement includes an additional control pressure chamber acting in the closing direction. The additional control pressure chamber is configured to be loaded via the pilot valve, and the pressure-maintaining valve closes. The pressure of the inlet of the pressure-maintaining valve is used for this purpose.

Pressure-maintaining valve arrangement for a purge circuit of a closed hydraulic circuit

A cold start valve for a hydraulic circuit has a valve slide with two counteracting control faces. It is possible to load a first control face with a control pressure and to load a second control face with a feed pressure. In addition, the first control face is loaded with the spring force of a valve spring. A damping space is configured to damp a stroke movement of the valve slide. The damping space is delimited by a damping face formed on the valve slide and oriented in accordance with the first control face. The damping face is configured to be loaded via the damping space with a damping pressure to damp the stroke movement. The damping space is connected in a throttled manner to a pressure space. The second control face of the valve slide is configured to be loaded with the feed pressure via the pressure space.

Cold start valve and hydraulic arrangement having a cold start valve of this type

The invention relates to a reversible axial piston machine () consisting of a cylinder drum () which rotates about a rotational axis () and in which pistons can be displaced in cylinders (), said pistons being supported against an inclined surface (). The angle of adjustment (&#x3b1;) of the inclined surface () can be adjusted in both pivoting directions by means of a control piston () pertaining to the adjusting device (), said control piston extending essentially parallel to the direction of the rotational axis () of the cylinder drum (). The zero position of the adjustment of the inclined surface () can be adjusted without play by means of a zero position adjusting device ().

Longitudinally adjustable reversible axial piston machine

Axial piston machine

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Neu-Ulm, Germany

Hakan Camurdan