Abstract: A hydraulic control arrangement which has a directional control valve, a hydraulic pump and a two-way cartridge valve constructed as a seat valve. The directional control valve is connected to an inlet line and to a discharge line leading to a tank. Leading off from it is a load line leading to a hydraulic load. The hydraulic pump draws pressure medium from a tank and discharges it into the inlet line. The two-way cartridge valve is arranged in the inlet line and, in a closed position, isolates a second inlet line section leading off from the latter to the directional control valve from a first inlet line section running between the two-way valve and the hydraulic pump.

Abstract: A HEUI system uses a fixed displacement, axial displacement pump to provide a generally constant pump flow of high pressure hydraulic fluid over the operating speed range of the pump to minimize parasitic power drains on the engine. The axial piston pump includes a orificing suction slot to vary the pump displacement over the operating speed of the pump. A throttling valve at the pump inlet may be provided to starve inlet fluid feed if reduced flow to the injectors is additionally required.

Abstract: In a check valve assembly and a valve assembly employing such a check valve assembly, a topping piston may be taken into contact with a main poppet to raise the main poppet from its seat. The main poppet is designed without significant area difference from the valve seat and the topping piston is actuated through a pilot valve, so that the process of raising the main poppet from the valve seat is controllable.

Abstract: An invention relates to an electrically controlled braking system which is intended for use on a wheeled vehicle and has input means which can be actuated by a driver of the vehicle in accordance with the desired braking effect, two electronic control units, which operate independently of each other and each of which can be supplied with an electrical signal corresponding to the extent of actuation of the input means, which can be recorded by a sensor, a brake cylinder assigned to a wheel and a braking pressure modulator valve which is fluid-connected to the brake cylinder and has a first electric actuating element, which can be activated by a first of the two control units. To make the braking system very safe, the braking pressure modulator valve has a second electric actuating element which acts in the same direction when activated, as the first electric actuating element.

Abstract: A support for a car body on a chassis, in particular on a truck of a rail vehicle. A support comprises a fluid-actuated piston-cylinder unit arranged between car body and chassis, and a rocker support arranged also between car body and chassis which comprises a first support part and a second support part which is arranged between the first support part and a part of the car. Each support part has a rolling surface via which it rests on another rolling surface, in which connection at least one rolling surface of the two rolling surfaces contacting each other is cylindrical and the contact between a pair of rolling surfaces is linear. The support part takes up little space. The distance between the car body and the chassis can be very small.

Abstract: A simply-designed, multi-purpose transport module with which heavy loads can be moved over the ground has the following features: a frame, on which the load is laid, is positioned on the floor. A support is positioned on the floor. The ground loading pressure of the frame, on an increase of the ground pressure loading of the support, and the ground pressure loading of the support, on an increase of the ground pressure loading of the frame, can be reduced to below the unloaded weight through an actuator of the frame or of the support. The frame and the support have a first pair of inclined paths through which the frame can be supported on the support and the frame is displaceable horizontally with respect to the support on achieving a sufficient reduction of its ground pressure loading.

Abstract: A directional control valve has an axially displaceable control piston inside a valve housing and a travel sensor arranged on the valve housing to detect the position of the control piston. The sensor includes a travel sensor tube which is pressure tight and sealed on one end and has a directional transmitter rod extending into the other end. The directional transmitter rod is secured to the control piston and extends through the area connecting the inside of the valve housing to the travel sensor tube. A seal exposes a dampening gap placed in the connecting area forming a throttle point enabling oil to flow into the travel sensor tube.

Abstract: A valve assembly for actuation of a user and a method for actuation of the valve assembly, wherein a supply throttle device and a drain throttle device may be actuated independent of each other, is disclosed. In the case of single-action users, the drain throttle device is actuated such that the open cross-section of the drain throttle is maximum upon attaining the desired volumetric flow of hydraulic oil, so that the energy losses in the drain conduit are reduced to minimum.

Abstract: A valve assembly for pressure adapted and volumetric flow adapted supply of at least one user may be supplied with hydraulic fluid or connected to a tank via two work ports of a continuously adjustable directional control valve. To the two work ports of the valve assembly a common pressure compensator is associated, the piston of which is guided in axial translation in an axial bore of the directional control valve spool, so that one of the two work ports may optionally be connected to the pump port upon suitable actuation of the directional control valve. At both end surfaces of the directional control valve spool and at the spring side of the pressure compensator piston, there acts a respective control pressure which, for example, corresponds to the highest system load pressure, the individual load pressure, or a pressure derived therefrom.

Abstract: The invention relates to distributing valve for load-independent control of a hydraulic consumer with regard to direction and speed. Similar distributing valves known per se have a control valve (30) which can be axially displaced in a slide bore hole (11) of a valve housing (10). In a neutral position, said control valve (30) blocks off two consumer chambers (13, 15) from a feed chamber (14) and selectably connects one of the two consumer chambers (13, 15) to a feed chamber (14) and the other consumer chamber (15, 13) to a return chamber in two operating positions. In addition, two brake pistons (51, 52) are arranged in two opposite lying receiving areas (33, 34) of the control valve (30).

Abstract: In the case of ferries, floating bridges or the like, a bridge support and a ramp forming the connection to the bank are connected to one another pivotably via a pivot point. For adjusting the ramp incline, a differential cylinder is arranged between the bridge support and the ramp in the area of the pivot point. The piston surfaces of the differential cylinder are impinged upon with a pressure that adjusts itself in accordance with the respective loading of the ramp. The pressure in the cylinder chamber on the rod side is a measure of the bending moment in the connecting area of the ramp to the bridge support. A pressure limiting valve, serving as a safety valve, limits the pressure in the cylinder chamber on the rod side and consequently the bending moment in the connecting area of the ramp to the bridge support. The pressure limiting valve is arranged in a line connecting the two cylinder chambers directly to one another.

Abstract: A manually operable hydraulic pilot-control device having a continuously adjustable pressure-reducing valve, having a housing and, in a continuous housing bore, a control piston, actable upon by a control spring in opening direction of a connection between a pressure inlet and a control outlet and is actable upon in opposite direction by pressure in the control outlet, and its control spring is restrained between a first fixed stop of the control piston and a spring retainer, placeable against a second fixed stop of the control piston and is driveable by an axially guided plunger located at a first open end of the housing bore and is supportable spaced from the second stop of the control piston.

Abstract: A compact hydraulic unit which can be used for cooling an electric motor sufficiently for continuous operation, having an annular cylindrical pressure medium container that has an outer external wall and an inner external wall as well as two end flanges, an electric motor that is sealed and is surrounded by the pressure medium container and cooled by a cooling air stream, and a hydraulic pump driveable by an electric motor. The pressure medium container fits closely around the electric motor and the inner external wall of the pressure medium container serves as a guide means for the cooling air stream flowing over the electric motor. By this, the entire volume of air flowing between the electric motor and the pressure medium container is fully utilized for cooling the electric motor and also flows closely along the housing of the motor over the winding heads of the electric motor that are located remotely from the single fan wheel.

Abstract: A precontrolled 3-way pressure control valve with a main valve having, in a valve housing, a valve bore with first, second and third control chambers connected with pressure connection, tank connection, and control connection, respectively, a control piston displaceable in a valve bore, wherein the third control chamber is connectable with the first or second control chambers, and subjectable in opposite direction to pressures from the control connection and pressure setting of a pilot valve. With deviation of pressure applied in control connection from pressure setting of the pilot valve, an imbalance of forces develops in the valve. Oblong holes, distributed over circumference of hollow control piston pass through the wall, are located in the wall radially delimiting its hollow chamber, which holes are longer than clearances between two control chambers.

Abstract: A device for controlling a hydrostatic drive (1) having a resonator (2) which is connected on the one hand to the hydrostatic drive (1) and on the other hand to a pressurized-fluid supply line (4) and to a return line (5), and having a periodically actuatable switch valve (3) which connects the resonator (2) alternately with the pressurized-fluid supply line (4) and the return line (5). In order to assure advantageous control conditions, the resonator (2) has at least one pressure chamber (6) with a movable, oscillatable chamber limitation (7) for changing the chamber volume movable chamber limitation (7) form a part of a single-mass oscillator comprising mass and spring (10). The pressure chamber (6) which can be connected alternately with the pressurized-fluid supply line (4), the return line (5) and the hydrostatic drive (1) can be acted on via the switch valve (3) with a switch frequency which lies in the supraresonance region of the single-mass oscillator.

Abstract: A 2-way fitted valve (2) includes a main piston (6) guided in a valve bush (4) and allowing flow of a hydraulic fluid therethrough, whereby an inlet port (B) is connected with an outlet port (A). In the region of a throttle point (8) of the main piston (6) an effective surface (D-d) is provided, so that due to the pressure drop at the throttle point (8) a pressure force acts on the main piston (6) such as to urge it in the direction towards its home position.

Abstract: The invention concerns a hydraulic device for controlling the hydraulic-fluid flow to and from a single-acting cylinder (3) on which a load (4) acts. Located between a pump (1) and the cylinder (3) is a controlled valve array (5) which, together with a controlled on-off valve (9) which in one position allows hydraulic fluid to pass back into the reservoir (2), controls the flow of hydraulic fluid to and from the cylinder (3). In order to be able to lift the piston slowly and at constant speed in the cylinder (3), independently of the load (4) acting on the piston, the invention calls for a throttle (6) and a non-return valve (7) to be connected in series, by-passing the valve array (5). A pressure regulator (10) maintains the pressure difference through the throttle (6) constant and feeds the fluid not required to maintain the pressure difference through the throttle (6) back to the reservoir (2).

Abstract: A directional control valve has snap-locking device for retaining the slide of the directional control valve in at least one switching position. The snap-locking device has a snap-locking part with a snap-locking piston that allows an engagement part to engage and lock the slide of the directional control valve. A kick-out device disengages the engagement part when a predetermined control pressure is exceeded. The kick-out device triggering force may be adjusted by a setting device that acts on a kick-out spring. A switching device that allows the kick-out function to be switched off independently of the setting of the setting device associated with the directional control valve in order to prevent disengagement independently of the initial stress of the kick-out spring.

Abstract: What is disclosed is an inching and braking system for a hydraulically powered apparatus with a brake system and a drive system, wherein the drive system and the brake system can be controlled in order to generate a braking effect by actuating the inching and braking system. In the solution according to the invention, an inching valve arrangement and a brake valve arrangement can be coupled mechanically to one another so that the apparatus can be controlled more sensitively during transition from inching to braking.

Abstract: Manually-operated remote-control device, especially hydraulic manipulator, comprising: a body (1) containing at least one moving signal-generating member, controlled by a push-rod (2) projecting above the body (1) and movable by a rocking cam (4) fixed to the top of the body (1); means (5) of rotary articulation, comprising a fixed clevis mount (5a) secured to the body (1) and a moving clevis mount (5b) secured to the cam (4), these clevis mounts (5a, 5b) being coupled together so as to allow the cam (4) to rock with respect to the body (1); a base (6) secured to this cam and supporting an operating handgrip (7); characterized in that the moving clevis mount (5b) of the articulation means, the cam (4) and the base (6) are constructed in the form of a single monobloc component (14).