Abstract: A valve has a valve piston (12) guided longitudinally movably in a valve housing (10) and actuated by an operation device (14). In one valve piston position, a connection is produced between a pressure supply port (P) and a working port (A). In another valve piston position, a further fluid-conducting connection is produced between the working port (A) and a tank port (T). The pressure difference arising between the working port (A) and the tank port (T) as flow passes through the further fluid-conducting connection acts, by an actuation device (30), on the valve piston (12). The valve piston passes from a stop position (32), with the further fluid-conducting connection shut off, into a fully open opening position with an enlarged opening cross section from working port (A) to tank port (T).

Abstract: A valve, in particular proportional pressure regulating valve, having a spring-loaded valve piston (10) which is guided in longitudinally displaceable fashion, in a manner actuated by an energizable actuating magnet (14), within a valve housing (12) and which, in a manner dependent on the displacement position thereof, produces or shuts off again a fluid-conducting connection between a pump port (P) and a working port (A) and between said working port (A) and a tank port (T) in the valve housing, wherein those face sides of the valve piston (10) which are situated opposite one another are permanently acted on by the pressure of the tank port (T), and wherein the valve piston (10) has a regulation surface (44) which is active in terms of pressure and which is connectable in fluid-conducting fashion to the working port (A) for the generation of the regulation pressure (PR), and having a ring-shaped chamber (42) in the valve housing (10), into which ring-shaped chamber the working port (A) opens in a radial or a

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

Abstract: A valve device, in particular a double stop-check valve, preferably of the two-way valve type, has at least three fluid connections (1, 2, 3) provided in a valve housing (51). Two valve elements (65, 67) can slide in the valve housing (51). One control device (71) controls the valve elements (65, 67). At least one of the valve elements (65, 67) forms, together with parts (59/61) of the valve housing (51), a seat leak-tight closure part for the associated fluid connections (1, 2, 3).

Abstract: A control device selectively fluidically connects and disconnects fluid connection points (A, P, T) by a valve (5), which controls fluid-conducting connection channels (55, 57, 59) extending between the connection points (A, P, T). The connection channels are arranged in a control block (3), into which the valve (5) is at least partially inserted. Proceeding from the respective fluid connection points (A, P, T), the connection channels (55, 59, 57) connected to the fluid connection points extend in parallel to each other until the connection channels lead into a respective control chamber (49; 53, 51). The valve (5) is retained in a receptacle (39) separating two adjacently arranged control chambers (49, 51) from each other.

Abstract: A valve, in particular for hydraulic circuits, includes a valve body (4) designed as a cartridge that can be fixed in a housing (6) having fluid connections (8) by a securing device (20, 26, 28). The securing device has at least one blocking element (20) in the form of a separate component between the valve body (4) and the housing (6). The blocking element has blocking surfaces that can be moved relative to the longitudinal axis (18) of the valve body (4) between an assembly position allowing the valve body (4) to be inserted into the housing (6) and a blocking position in which the blocking surfaces secure the valve body in an assembly position, preferably with zero backlash by bearing against retaining surfaces (26, 28) of the housing (6) and the valve body (4).

Abstract: A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing (7) with a fluid inlet (21) and a fluid outlet (23). The fluid stream between the fluid inlet (21) and the fluid outlet (23) is adjustable by a main piston (27). A pilot valve chamber (37) provided on a rear face (29) of the main piston (27) has a pilot valve closing member (33) movable by an actuating device (69). By closing member (33) the fluid stream between the pilot valve chamber (37) and the fluid outlet (23) can be adjusted. An inlet aperture (3) is arranged between the fluid inlet (21) and the pilot valve chamber (37). A maximum volumetric flow controller (5) is in the main piston (27) in an outflow between the pilot valve chamber (37) and the fluid outlet (23).

Abstract: A proportional pressure-regulating valve (10) for actuating a first fluid connection (f1) from a working connection (A) to a tank connection (T) and a second fluid connection (f2) from a supply connection (P) to the working connection (A), includes a regulating piston (14) guided movably in a valve housing (12). The regulating piston opens the first fluid connection (f1) and closes the second fluid connection (f2) when in a first position, and closes the first fluid connection (f1) and opens the second fluid connection (f2) when a second position. The regulating piston (14) can be displaced from a first position into a third position when the first fluid connection (f1) is open by the total differential pressure produced when fluid flows through. When the regulating piston (14) is in the third position, the first fluid connection (f1) is opened with an enlarged opening cross section compared to the first position, and the second fluid connection (f2) remains closed.

Abstract: A directional poppet valve (10) has valve pistons (16-22) arranged in a valve housing (12) for controlling a plurality of fluid connections (A, B, P, T). The positions of each valve pistons (16-22) in the valve housing (12) can be changed by at least one actuating device. The fluid connections (A, B, P, T) are connected to one another or separated from one another alternately depending on the position of the valve pistons (16-22). The valve pistons (16-22) are arranged inline along at least one axis (R), consecutively and/or at least such as to partially interengage, in the valve housing (12).

Abstract: 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), includes 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 fluid chamber is arranged between the pilot control stage (48) and the main control stage (38). The relief stage (54) compares the existing load pressure at load terminal (LS) dedicated to the hydraulic consumer (12a, 12b) with the outflow pressure at the outflow connection (T), clearing the pressure relief if both pressures are approximately the same. The relief stage (54) can be directly connected to the load connection (LS) and can be charged with load pressure.

Abstract: A valve, in particular a pilot-operated proportional directional poppet valve, has a valve housing (7) with a fluid inlet (21) and a fluid outlet (23). The fluid stream between the fluid inlet (21) and the fluid outlet (23) is adjustable by a main piston (27). A pilot valve chamber (37) on a rear face (29) of the main piston (27) has a pilot valve closing member (33) movable by an actuating device (69) to adjust the fluid stream between the pilot valve chamber (37) and the fluid outlet (23). A supply aperture (3) is between the fluid inlet (21) and the pilot valve chamber (37). The opening cross-section of the supply aperture (3) can be reduced by a control element (49).

Abstract: Device with hydraulic system actuates first and second hydraulic consumers. The hydraulic consumers (10, 12) can be supplied with fluid at a predefinable pressure at least via a flow divider (26) for dividing a fluid flow from a pressure supply (P) into predefinable part flows leading to the respective hydraulic consumer (10, 12). A fluid flow from the hydraulic consumer (10) with higher pressure loading via the flow divider (26) to the hydraulic consumer (12) with lower pressure loading can be suppressed by one shut-off device (38) arranged between the flow divider (26) and at least one hydraulic consumer (12). The shut-off device (38) is arranged in a fluidic connection (F2) from the flow divider (26) to the hydraulic consumer (12) with lower pressure loading.

Abstract: A hydraulic system includes an actuator operating as a consumer of hydraulic energy and as a generator of hydraulic energy in different operating states, and includes a hydraulic accumulator (1). In an operating state of the actuator (49), the accumulator can be charged by the actuator for storing energy. In a different operating state, the accumulator can be discharged for delivering energy to the actuator (49). The hydraulic accumulator is an adjustable hydropneumatic piston accumulator having a plurality of pressure chambers (19, 21, 23, 25) adjoining effective surfaces (11, 13, 15, 17) of different sizes on the fluid side of the accumulator piston (5). An adjusting arrangement (51) connects a selected pressure chamber (19, 21, 23, 25) or a plurality of selected pressure chambers (19, 21, 23, 25) of the piston accumulator (1) to the actuator (49) as a function of the pressure level that prevails on the gas side of the piston accumulator (1) and on the actuator (49).

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

Abstract: A proportional pressure-regulating valve (1) includes a valve housing (3) having pump, utility and tank connections (P, A, T). A regulating piston (5) is longitudinally displaceable within the valve housing (3) to selectively connect the pump connection (P) to the utility connection (A) and the utility connection (A) to the tank connection (T) and is controllable by a magnetic coil device (7). The regulating piston (5) has a surface ratio (9) such that pressure on the utility connection (A) generates a counter force (FG) against the magnetic force (FM) of the magnetic coil device (7), moving the regulating piston (5) back and causing reduction of pressure medium from the pump connection (P) to the utility connection (A) until the pressure acting on the utility connection (A) corresponds to the magnetic force (FM) of the current signal applied to the magnetic coil device (7).

Abstract: An electromagnetic proportional 2-way flow control valve (1) has a valve housing (2) in which a control piston (3) is guided to be displaced axially. The control piston (3) actuates at least one fluid-conducting connection (4) between a fluid inlet (5) and an outflow opening (6). An armature (8) can be actuated by a proportional magnet and acts on the control piston (3). A pressure detecting piston (9) serves as the actuator part on the control piston (3). The fluid inlet (5) is connected in a fluid-conducting manner by a pressure detecting channel (11) to a pressure detecting chamber (12) such that the fluid pressure prevailing in the pressure detecting chamber (12) loads the pressure detecting piston (9) and the control piston (3) with a force (F) in the direction of relief of the armature.

Abstract: A load-holding valve (1) having at least one main control piston (39) which is guided longitudinally displaceably in a single-piece or multiple-piece valve housing (29) and a non-return piston (43), wherein, in switching positions, in the form of a load-holding position a fluid-conducting connection between at least two connection points (37, 21) is shut off by means of the two pistons (39, 43), of which connection points (37, 21) one (37) serves to feed or discharge media and the other (21) leads to a hydraulic consumer, in the form of a load-raising position the two pistons (43) move relative to one another into a release position, in which the connection between the medium feed (37) and the consumer is established, and in the form of a load-reducing position the two pistons (39, 43) assume a predefinable spacing from one another in such a way that the connection between the medium discharge (37) and the consumer is established, is characterized in that there is a monitoring device (75) which determines the

Abstract: The invention relates to a valve, in particular a pilot-operated proportional directional poppet valve, having a valve housing (7) which has a fluid inlet (21) and a fluid outlet (23), wherein the fluid stream between the fluid inlet (21) and the fluid outlet (23) is adjustable by a main piston (27), wherein a pilot valve chamber (37) provided on a rear face (29) of the main piston (27) has a pilot valve closing member (33) which can be moved by an actuating device (69) and by which the fluid stream between the pilot valve chamber (37) and the fluid outlet (23) can be adjusted, wherein an supply aperture (3) is arranged between the fluid inlet (21) and the pilot valve chamber (37), characterised in that the opening cross-section of the supply aperture (3) can be reduced by a control element (49).

Abstract: A valve device includes a valve housing (2) and a valve piston (4) axially displaceably in a housing bore (3). By valve piston movement, load connections (A, B) can alternately be connected to a pressure connection (P) and to a tank connection (T1, T2) by solenoid magnets (5, 6). Pilot control chambers (8, 10) pressurize piston back sides (9, 11). The control chambers (8, 10) are connectable via fluid-conducting connections (12, 13) to the pressure connection (P). Pilot control pistons (14, 15) release or close fluid-conducting connections (16, 17) between control chambers (8, 10) and the tank connection (T1, T2). One pilot control piston (14, 15) includes a ring channel (19) controlling a fluid-conducting connection (16, 17) between a pilot control chamber (8, 10) and a tank connection (T1, T2).

Abstract: A hydraulic aggregate, particularly for supplying conveyor and lifting devices with pressurized fluid, has a tank (1) on the end side relative to a main axis of the device and functional components mounted on it. The functional components are a hydraulic pump (5) and a coupling body (3) having a valve device and a line arrangement for drawing in and returning hydraulic fluid to and from the tank (1). Configured as a reversing aggregate, the inlet end (19) of the suction line (15) of the line arrangement is disposed at a location within the tank (1) where the bottom of the fluid present in the tank (1) is located when the aggregate is operated with the main axis vertical and when the aggregate is operated with the main axis tilted relative to the vertical, preferably perpendicular to the vertical.