Abstract: The invention concerns a method and a hydromachine with a commutation device and with expanding and contracting pressure chambers passed by fluid and formed by displacement arrangements. With the method and the hydromachine, it is endeavoured to control a displacement in the hydromachine to keep pressure fluctuations small. For this purpose, the hydromachine has a group of devices, comprising a commutation device and at least two displacement devices, at least two of the devices being adjusted in relation to each other.

Abstract: The invention concerns a hydraulic steering arrangement (1) with a supply connection arrangement having at least a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having at least two working connections (L, R), a steering unit (7), which can be activated by a steering transducer (2), the steering unit having a first load-sensing connection (LS1), and a steering valve (8) having a second load-sensing connection (LS2), the steering unit (7) and the steering valve (8) being arranged in parallel with each other between the supply connection arrangement and the working connection arrangement. It is endeavoured to ensure a good steering behaviour.

Abstract: The invention concerns a hydraulic steering arrangement with a hydraulically actuated steering valve arrangement, steering motor connections (CL, CR), which are connected to supply connections (HP, T) via the steering valve arrangement, and a steering unit. It is endeavoured to equalize in a simple manner the steering behaviour in both directions. For this purpose, it is ensured that the steering valve arrangement has a directional valve and a flow control valve.

Abstract: The invention concerns a hydraulic steering arrangement with a steering motor, a supply path between a pressure source and the steering motor, in which supply path a throttling device and a measuring motor are located, a return path between the steering motor and a pressure sink, in which return path a return throttle is located, and a bypass path, which connects the supply path and the return path on the pressure source end or the pressure sink end, respectively, and which has a bypass throttle. It is endeavoured to make such steering arrangements suitable for fast motorboats. For this purpose it is ensured that with a load on the steering motor the pressure drop over the bypass throttle is larger than the sum of the pressure drops between a point before the first throttle and a point after the last throttle of the throttling device.

Abstract: A hydraulic steering arrangement includes a steering valve, a steering motor, connected with a high-pressure connection and a low-pressure connection via the steering valve, and with a steering unit, connected via the steering valve with a pilot pressure valve, whose outlet is connected with the low-pressure connection. It is endeavoured to improve the steering behaviour. For this purpose, the pilot pressure valve is opened, before the steering valve creates a connection between the high-pressure connection and the steering motor.

Abstract: The invention concerns a valve arrangement for controlling a hydraulic drive, the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the valve arrangement in such a manner that it is intrinsically tight, at the same time having a relatively simple design. For this purpose, a pump pipe and a tank pipe are connected with a first control valve, the first control valve being connected by separate pipes with a second control valve and a third control valve connected in parallel with the second control valve, the second control valve being connected with a first working connection of the hydraulic drive and the third control valve being connected with a second working connection of the hydraulic drive, backflow preventers for preventing the flow from the hydraulic drive in the direction of the tank being connected in parallel with the second control valve and/or the third control valve.

Abstract: The invention concerns a valve arrangement for controlling a hydraulic drive having a first working connection (A) and a second working connection (B), and being connectable with or separable from a pressure source (P), the supply and the outflow of the hydraulic drive being separately controllable. It is endeavoured to improve the energetic efficiency of the valve arrangement. For this purpose, the first working connection (A) is connected with a first control valve and the second working connection (B) is connected with a second control valve, the first and the second control valves being connected with each other and with a third control valve, which is connected with a tank.

Abstract: The invention concerns a hydraulic control (1) with a supply connection arrangement (7) 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 consumer, a control valve (8) with a valve element (9) between the supply connection arrangement and the working connection arrangement and a compensation valve (11), which is located between the high-pressure connection (P) and the control valve (8) and is acted upon in the closing direction by a pressure between the compensation valve (11) and the control valve (8). It is endeavoured to ensure the most favourable energy consumption possible. For this purpose, in the opening direction the compensation valve (11) is acted upon by a pressure of a selection device (29, 30, 30?, 38), which optionally supplies the compensation valve (11) with a pressure control pressure or a flow control pressure.

Abstract: The invention concerns a brake valve arrangement of a vehicle having a trailer coupling and at least one controllable hydraulic consumer, with a brake valve (27). It is endeavoured to provide a similar embodiment of a vehicle with such a brake valve arrangement. For this purpose, the brake valve (27) is combined with at least one control valve (11, 12) controlling the hydraulic consumer into forming a valve block (10) having several valve modules.

Abstract: A hydraulic valve arrangement with a first and a second working connection, both working connections being connectable with a hydraulic consumer, a supply connection having a pressure connection and a tank connection, a first valve, which closes the pressure connection or connects it in a controlled manner with the first working connection or the second working connection, a second valve, which closes the tank connection or connects it in a controlled manner with the first or the second working connection, and a control device, which controls the first valve and the second valve. It is endeavored to enable a simple manner of exact controlling the consumer. For this purpose, at least one valve is provided with an opening degree sensor, which is connected with the control device, the control device controlling the valve arrangement in dependence of the signal from the opening degree sensor and a specified signal.

Abstract: The invention concerns a hydraulic steering arrangement (1) with a supply connection arrangement having at least a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having at least two working connections (L, R), a steering unit (7), which can be activated by a steering transducer (2), the steering unit having a first load-sensing connection (LS1), and a steering valve (8) having a second load-sensing connection (LS2), the steering unit (7) and the steering valve (8) being arranged in parallel with each other between the supply connection arrangement and the working connection arrangement. It is endeavoured to ensure a good steering behaviour.

Abstract: The invention concerns a valve arrangement (1) with at least two valve modules (2, 4, 5), each having a valve element, whose position can be changed by means of an actuator (13, 13a, 13b), and to which a position sensor (19, 19a, 19b) is allocated, a line arrangement (24) being connected with the valve modules (2, 4, 5), through which control signals can be transmitted to the valve modules (2, 4, 5). It is endeavoured to increase the safety of such valve modules. For this purpose, at each valve module (2 to 5) the actuator (13) is provided with a control device (22, 22a, 22b), which is connected with the position sensor (19, 19a, 19b) and evaluates control signals for the valve module (2 to 5) concerned, that at least the control device (22b) of a first valve module (5) additionally evaluates the control signals for another, second valve module (4), and that this control device (22b) receives signals from the position sensor (19a) of the second valve module (4).

Abstract: The invention concerns a hydraulic valve arrangement (1) with a working connection arrangement having a first working connection (A) and a second working connection (B), both working connections (A, B) being connectable with a hydraulic consumer (2), a supply connection arrangement having a pressure connection (P) and a tank connection (T), a first valve arrangement with a first valve (12), closing the pressure connection (P) or connecting it in a controlled manner with the first working connection (A) or the second working connection (B), a second valve arrangement with a second valve (16), closing the tank connection (T) or connecting it in a controlled manner with the first working connection (A) or the second working connection (B), and a control arrangement controlling the first valve arrangement and the second valve arrangement. In such a valve arrangement, it is endeavoured to achieve improved operation behaviour.

Abstract: A hydraulic valve system (1) has a supply connection arrangement, having a high-pressure connection (P) and a low-pressure connection, with a working connection arrangement, having two working connections (A, B), with a control valve (3), which is arranged between the supply connection arrangement and the working connection arrangement, and with a non-return valve (24, 28) for each working connection (A, B). The valve being arranged between the control valve (3) and the working connection arrangement. A tappet (36) mechanically opening the valve element (25, 29) of said non-return valve.

Abstract: A leakage compensation system in a control device (S) has a fully hydraulic steering system (1) with a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T). A working connection arrangement has two working connections (CL, CR), a control section between the supply connection arrangement (P, T) and the working connection arrangement (CL, CR). A control element (2) for activating the control section, a steering member (3) and an auxiliary fluid path (12) has a valve arrangement (A6, A7), through which hydraulic fluid can be supplied or drained off.

Abstract: The invention concerns a vehicle with an attachment, which has a lifting drive with at least one hydraulic cylinder and a control device, the control device having a position sensor and a position generator. It is endeavored to improve the position control of the attachment. For this purpose, the control device has a trajectory generator, which generates a trajectory in dependence of a desired position value and an acceleration limit, said trajectory being optimized with regard to a time specification, and a follower, which controls the lift drive in dependence of the trajectory.

Abstract: The invention concerns a hydraulic machine with a toothed set comprising a toothed ring with an inner toothing, whose circumferential surface extends in parallel with its axis, and a gear wheel (3) with an outer toothing, whose circumferential surface (24) extends in parallel with its axis, at least one tooth flank having an edge as an axial end of a section, which is located between the circumferential surface and a surface directed radially inwards. It is endeavoured to reduce the wear. For this purpose it is ensured that in the radial direction an edge (22, 23) ends so as to be offset inwards in relation to the circumferential surface (24).

Abstract: The invention concerns a joystick arrangement (1) with a basic unit (3) and a movable handle unit (2), which comprises at least one electrical function element (15) with an energy supply connection and an endpoint of a wireless signal transmission path. It is endeavoured to simplify the mounting. For this purpose, the energy supply connection is connected with a power receiver (16) located in the handle unit (2), which power receiver (16) can be supplied with energy via a wireless power transmission path (20).

Abstract: The invention concerns a valve arrangement (1) with a high-pressure connection (P), a low-pressure connection (T), at least one control valve (2 to 5), which is accommodated in a control valve module and has at least one working connection (A, B) for a hydraulic consumer (7 to 10), and a safety valve (6), which is accommodated in a safety valve module, and which releases or blocks a passage between the high-pressure connection (P) and the control valves (2 to 5), the control valve module (2 to 5) and the safety valve module (6) being connected to one component group. It is endeavoured to provide a valve arrangement with a high safety level. For this purpose, it is ensured that each control valve (2 to 5, 2? to 5?) has an error detection device (19), that the safety valve module (6) has a safety switch device (21) and that the component group has a connection (20) between the safety switch device (21) and the error detection device (19).

Abstract: 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.