Abstract: The invention relates to a valve (18) for a valve assembly (10) for regulating the pressure of a fluid guided in a hydraulic system for supplying pressure to at least one hydraulic consumer (12a, 12b), comprising a pilot control stage (48) and a main control stage (38) for at least partially clearing or blocking a fluid path from a supply connection (P) to an outflow connection (T), a relief stage (54) for pressure relief of a third chamber arranged between the pilot control stage (48) and the main control stage (38). The relief stage (54) compares the existing load pressure at a load terminal (LS) dedicated to the at least one hydraulic consumer (12a, 12b) with the outflow pressure at the outflow connection (T), clearing the pressure relief if both pressures are approximately the same or identical, which valve is characterized in that the relief stage (54) can be directly connected to the load terminal (LS) and can be charged with load pressure.

Abstract: A valve device includes a housing (2) and a valve piston (4) axially displaceable in a piston bore (3) of housing (2). First and second load connections (A, B) can alternately be connected to a pressure connection (P) and to tank connections (T1, T2) by moving the piston from an idle position by first and second solenoids (5, 6). First and second pilot control chambers (7, 9) pressurize first and second piston back sides (8, 10) of the valve piston (4). The pressure in the pilot control chambers (7, 9) is controlled by first and second pilot control pistons (12, 13) movable by the solenoids (5, 7). The pilot control chambers (7, 9) are connected via a connection (11) to the pressure connection (P). The pilot control pistons (12, 13) open or close connections (14) between the pilot control chambers (7, 9) and the tank connections (T1, T2).

Abstract: A valve assembly for regulating the pressure of a pressure medium (2) of a pressure medium pump (3) to at least one first consumer (4) includes a pilot-controlled pressure control valve (5) with a main piston (6) acted on by the pressure medium (2) and a pilot piston (7). A pressure chamber (8) between a piston back side (9) of the main piston (6) and the pilot piston (7) can be relieved. A relief valve (10) is connected in a fluid-conducting manner to the pressure chamber (8), opens when pressure at the load sensor (LS) represents an out-of-operation mode of the consumer (4), and recirculates pressure medium (2) having a low pressure to a pressure medium reservoir (11) or to the pressure medium pump (3). The relief valve (10) closes when the pressure at the load sensor (LS) represents an in-operation mode of the consumer (4).

Abstract: The invention relates to a valve (1), in particular a pressure regulating valve or a pressure limiting valve four controlling a pressure of a medium (3) that flows through the valve (1), comprising a main stage (5) and a pilot stage (7) which actuates the main stage (5), which is actuated against the effect of a restating device (11) by means of an energizable actuating device (9), and which has a pressure release stage (13) of the valve (1). The pressure release stage (13) has a surface area modification device (15).

Abstract: A hydraulic hybrid system for rotatory applications having an actuator (49, 91) in the form of a motor pump unit (91), which is coupled to a rotatory-operating device (94), such as a traction drive, and works as a consumer of hydraulic energy in one operating state of the device (94) and works as a producer of hydraulic energy in another operating state of the device (94), and having a hydraulic accumulator (1), which can be charged by the motor pump unit (91) for energy storage in the one operating state and can be discharged for energy release to the motor pump unit (91) in the other operating state, said hybrid system being characterised in that at least one hydraulic accumulator is provided in the form of an adjustable hydropneumatic piston accumulator (1) in which a plurality of pressure chambers (19, 21, 23, 25) that are delimited by active surfaces (11, 13, 15, 17) of different sizes on the fluid side of the accumulator piston (5) are formed and in that an adjusting arrangement (51) is provided, which

Abstract: The invention relates to a system for improving the energy efficiency in hydraulic systems, comprising an actuator (49) which, in an operating state, operates as a consumer of hydraulic energy and, in a different operating state, as a generator of hydraulic energy, and a hydraulic accumulator (1) which, when in an operating state of the actuator (49), can be charged by the same for storing energy and, when in a different operating state, can be discharged for delivering energy to the actuator (49).

Abstract: A piloted proportional throttle valve has a valve piston (29) displaceably guided in the longitudinal direction in a valve housing (13) having a fluid inlet (2) and outlet (1). The front side of the valve piston (27) can be pressurized against a main valve seat (25) by fluid pressure acting on its back side. A pilot valve device has an actuating member (7) displaceable in the longitudinal direction by an electrically actuatable magnet system (4), and works with a pilot valve seat (37) in a bore (17) of the valve piston (29) connecting its back side to the fluid outlet (1) on the front side of the piston. The fluid pressure on the back side of the piston (29) is reduced for an opening motion when the pilot valve seat (33) is released. A flow baffle device (39) is disposed between the back side of the piston and the fluid inlet (2) of the housing (13) to build up the fluid pressure pressurizing the piston (29) against its closed position by introducing pilot fluid.

Abstract: A proportional throttle valve includes a valve piston (2) functioning as a variable orifice and displaceably guided in the longitudinal direction in a valve housing (3) having a fluid inlet (4) and a fluid outlet (5). Since a leading edge (6) of the valve piston (2) is formed by a control piston (7) of a flow regulator (8) for the fluid connection of the fluid inlet (4) and the fluid outlet (5), the flow control valve and the proportional throttle valve are functionally combined in one valve unit.

Abstract: A valve, in particular, a proportional pressure relief valve, includes an electrically controlled solenoid system (10) for the control of an operating part (12, 12a). The operating part cooperates with a valve element (26) extending longitudinally inside a valve housing (24) to release a fluid transport connection path between a fluid inlet (32) and a fluid outlet (34) in its open position and to block the through path in its closed position. An energy store, preferably in the form of a compression spring (58), is arranged between the operating part (12, 12a) and valve element (26) in a free gap between the two and tends to hold the valve element (26) in the direction of its closed position. The operating piece (12a) is embodied as a guide piston having a longitudinal guide for the valve element (26).

Abstract: A proportional throttle valve includes a valve piston (2) displaceably guided in the longitudinal direction in a valve housing (3) having a fluid inlet (4) and a fluid outlet (5) and pretensioned by an energy accumulator, in particular in the form a pressure spring, against a stroke stop (6) defining the closure position. A pressure limiting valve (7) is integrated in the proportional throttle valve (1). The side (8) of the valve piston (2) to allow the piston to move away from the stroke stop (6) in opposition to the pretensioning force when a predefinable pressure is exceeded at the fluid inlet (4).

Abstract: A proportional pressure control valve includes a valve box (10) having a pump (P), user (A) and reservoir (T) connections. Control piston (18) is guided in a longitudinally displaceably inside the valve box (10) for optionally connecting the pump connection (P) to the user connection (A) and the user connection (A) to the reservoir connection (T). A fluid-carrying connection is established between the pump connection (P) and a pilot chamber (20) of a pilot valve (22). The pilot valve (22) is controlled by a magnet system, especially a proportional magnet system (28). The proportional pressure control valve, for the fluid-carrying connection to the pilot chamber (20), has a bore (27) extending axially inside the wall of the valve box (10) and from a radial bore (9) of the housing (10) forming the pump connection (P).

Abstract: The invention relates to a proportional pressure-regulating valve (1) comprising a valve housing (3) that has at least three fluid-conducting connections, in particular in the form of a pump connection (P), a utility connection (A), and a tank connection (T). A regulating piston (5) is guided in a longitudinally displaceable manner within the valve housing (3) in order to selectively connect the pump connection (P) to the utility connection (A) and the utility connection (A) to the tank connection (T), said regulating piston being controllable via a magnetic force (FM) by means of a magnetic coil device (7) to which current signals can be applied.

Abstract: A valve, in particular a pilot-operated proportional pressure control valve, with a valve housing (5) which has a pressure supply port (7), a working port (9), and a drain port (11), in the valve housing (5) there being a main valve piston (15) which can be moved by a pilot stage (13) for control of the fluid flow between the pressure supply port (7) and the working port (9), with the pilot stage (13) having a valve closing element (43) for a pilot chamber (41), with the valve closing element (43) being movable from an open position (OS) into a closed position (SS) by an actuating apparatus (45), is characterized in that the valve closing element (43) can actuate a leakage reduction stage (53).

Abstract: A valve, particularly a proportional pressure control valve for controlling fluid flows, includes a valve housing (10) having at least three fluid-conducting connections in the form of a pump connection (P), a use connection (A) and of a tank (T) connection. To connect the pump connection (T) to the use connection (A) and the use connection (A) to the tank connection (T), a control piston (18) can be guided in a longitudinally displaceable manner inside the valve housing (10). This control piston is provided for establishing a fluid-conducting connection between at least one of the connections (P) and a pilot chamber (20) of a pilot valve (22) having a connecting channel (24). A valve part (40) of the pilot valve (22) is guided in the pilot chamber (20) in a longitudinally displaceable manner. The connecting channel (24) has a throttle in the direction of the pilot chamber (20) of the pilot valve (22) with its valve part.

Abstract: The invention relates to a valve device comprising a valve housing (2) and a valve piston (4) arranged in an axially displaceable manner in a piston bore (3) of the valve housing (2), via which piston a first load connection (A) and a second load connection (B) can alternately be connected to a pressure connection (P) and to a tank connection (T1, T2) under the action of a first solenoid magnet (5) and a second solenoid magnet (6), wherein the valve piston (4) can be displaced from a centered, preferably middle idle position for connecting the first load connection (A) to the pressure connection (P) and the second load connection (B) to the tank connection (T1, T2) in a first direction, and it can be displaced for the reverse fluid-conducting connection of the connections (A, B, P, T1, T2) in an opposite direction, wherein a first pilot control chamber (7) is provided, which pressurizes a first piston back side (8) of the valve piston (4), and a second pilot control chamber (9) is provided, which pressurizes

Abstract: The invention relates to a valve device comprising a valve housing (2) and a valve piston (4) arranged in an axially displaceable manner in a piston bore (3) of the valve housing (2), via which valve piston a first load connection (A) and a second load connection (B) can alternately be connected to a pressure connection (P) and to a tank connection (T1, T2) by the action of a first solenoid magnet (5) and a second solenoid magnet (6), a pilot control unit (7) being provided, which comprises a first pilot control chamber (8) that pressurizes a first piston back side (9) of the valve piston (4) and a second pilot control chamber (10) that pressurizes a second piston back side (11) of the valve piston (4), the first and second pilot control chambers (8, 10) being connectable via a respective fluid-conducting connection (12, 13) to the pressure connection (P), a first pilot control piston (14) and a second pilot control piston (15) being provided, which release or close a fluid-conducting connection (16, 17) betw

Abstract: The invention relates to a valve assembly for regulating the pressure of a pressure medium (2) of a pressure medium pump (3) to at least one first consumer (4), comprising a pilot-controlled pressure control valve (5), a main piston (6) acted on by the pressure medium (2), and a pilot piston (7), wherein a pressure chamber (8) between a piston back side (9) of the main piston (6) and the pilot piston (7) can be relieved, is characterized in that a relief valve (10) is connected in a fluid-conducting e manner to the pressure chamber (8), which valve opens when pressure medium pressure is present at the load sensor (LS), which represents an out-of-operation mode of the consumer (4), and recirculates pressure medium (2) having a low pressure to a pressure medium reservoir (II) or to the pressure medium pump (3), and the relief valve (10) closes, when the pressure medium pressure at the load sensor (LS) represents an in-operation mode of the consumer (4).

Abstract: The invention relates to a proportional throttle valve comprising a valve piston (2) which is displaceably guided in the longitudinal direction in a valve housing (3) having a fluid inlet (4) and a fluid outlet (5) and is pretensioned by an energy accumulator, in particular in the form of a pressure spring, against a stroke stop (6) defining the closure position. The invention is characterized in that a pressure limiting valve (7) is integrated in the proportional throttle valve (1), wherein said pressure limiting valve allows to influence the fluid pressure on the rear side (8) of the valve piston (2) in order to allow the piston to move away from the stroke stop (6) in opposition to the pretensioning force when a predefinable pressure is exceeded at the fluid inlet (4).

Abstract: The invention relates to a proportional throttle valve, comprising a valve piston (2) which has the function of a variable orifice and is displaceably guided in the longitudinal direction in a valve housing (3) having a fluid inlet (4) and a fluid outlet (5). Since a leading edge (6) of the valve piston (2) is formed by a control piston (7) of a flow regulator (8) for the fluidic connection of the fluid inlet (4) and the fluid outlet (5), the flow control valve and the proportional throttle valve are functionally combined in one valve unit.

Abstract: The invention relates to a proportional pressure control valve comprising a valve box (10) which has at least three fluid-carrying connections, especially in the form of a pump (P), a user (A) and a reservoir (T) connection, a control piston (18) being guided in a longitudinally displaceable manner inside the valve box (10) for optionally connecting the pump connection (P) to the user connection (A) and the user connection (A) to the reservoir connection (T). A fluid-carrying connection is established between the pump connection (P) and a pilot chamber (20) of a pilot valve (22), the pilot valve (22) being controlled by a magnet system, especially a proportional magnet system (28). The proportional pressure control valve according to the invention is characterized in that the fluid-carrying connection to the pilot chamber (20) has a bore (27) that runs axially inside the wall of the valve box (10) and extends from a radial bore (9) of the housing (10) forming the pump connection (P).