Abstract: A valve, in particular having the form of a 2/2-way seat valve, characterized in that a pressure limiting function (28) is integrated in a joint valve body to implement a thermal overpressure protection.

Abstract: A device includes a regulating piston (12) guided longitudinally movably in a housing (10) and interacting with a control edge (56), at a pressure supply port (P) that supplies a utility port (A) in regulating positions of the regulating piston (12) with fluid. The pressure can be preset via a fluid connection, pulling the regulating piston towards a closed position blocking this fluid connection due to occurring flow forces. The regulating piston (12) has a change of shape (60) from its general outer basic shape in the area of the control edge (56) of the housing (10) for a flow force compensation. A flow contact surface for fluid is provided causing a compensating force acting against the flow force to be introduced into the regulating piston (12), which flow force pulls the regulating piston (12) into an open position opposite from the blocked position.

Abstract: 1. Device and valve for flow force compensation. 2.

Abstract: A discharge pressure scale (30) includes a valve housing (41) having a functional connector (A), a return flow connector (T) and a user connector (28). A valve piston (52) is guided such that it moves longitudinally against the effect of an energy accumulator (42), moving from a respective opening or regulating position, against a valve seat (94), into a closed position. The user connector (28) and return flow connectors (T) are separated from one another. The fluid pressure present at the user connector (28) can be guided onto a pressure-active surface (A1*) of the valve piston (52) by a pressure compensation device (70) in such a way that it moves into its respective opening or regulating position in a pressure-compensated manner due to the force of the energy accumulator (42).

Abstract: A pressure-regulating valve has a valve piston (10) subjected to the action of an energy store and guided longitudinally in a valve housing (12). The valve housing has a supply port (14), a utility port (16) and a tank port (18) actuated by a control part (20) closing with a sealing action. In connecting from the supply port to the utility port, a pressure reduction function is realized. In a fluidic connection from the utility port to the tank port, a pressure-limiting function is realized. The control part (20) has a control rod (22) with two control bodies (24, 26) spaced apart from one another. One control body (24) controls the connection between supply port (14) and utility port (16). The other control body (26) controls the connection between utility port (16) and tank port (18).

Abstract: A pressure retaining valve (1) has a main control piston (39) guided longitudinally displaceably in a single-piece or multiple-piece valve housing (29) and a non-return piston (43). In a pressure retaining position, a fluid-conducting connection between connection points (37a, 37b, 21) is shut off by the two pistons (39, 43). Connection point (37a) serves to feed media. Connection point (37b) discharges media. Connection point (21) leads to a hydraulic consumer. In 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 (37a) and the consumer is established. In a load-reducing position, the two pistons (39, 43) assume a spacing from one another such that the connection between the medium discharge (37b) and the consumer is established. A monitoring device (75) determines the individual switching positions of the pistons (39, 43) to ensure reliable functioning of the pressure retaining valve (1).

Abstract: A pilot-controlled directional control valve, in particular a directional poppet valve, has a valve housing (10), at least three fluid connection points (12, 14, 16), a main control stage (18) and a pilot control stage. A further fluid-controlling intermediate stage (22) is arranged between the main control stage (18) and the pilot control stage (20). The main control stage (18) has a longitudinally movable main control piston (24). The pilot control stage has a longitudinally movable pilot control piston (26).

Abstract: The invention relates to a discharge pressure scale (30) consisting of at least one valve housing (41) having at least three fluid connection points in the form of a functional connector (A), a return flow connector (T) and a control connector (28), wherein a valve piston (52) is guided such that it moves longitudinally against the effect of an energy accumulator (42), moving from a respective opening or regulating position, against a valve seat (94), into a closed position, wherein the control (28) and return flow connectors (T) are separated from one another, characterised in that the fluid pressure present at the control connector (28) can be guided onto a pressure-active surface (A1*) of the valve piston (52) by means of a pressure compensation device (70) in such a way that it moves into its respective opening or regulating position in a pressure-compensated manner due to the force of the energy accumulator (42).

Abstract: A pressure-regulating valve having a valve piston (I0) which is subjected to the action of an energy store and which is guided in longitudinally displaceable fashion in a valve housing (12), which valve housing has ports such as a supply port (14), a utility port (16) and a tank port (18), which ports can be actuated, by way of a control part (20) which closes with a sealing action, such that, in the case of a fluidic connection from the supply port to the utility port, a pressure reduction function is realized, and in the case of a fluidic connection from the utility port to the tank port, a pressure-limiting function is realized, characterized in that the control part (20) has a control rod (22) with two control bodies (24, 26) held spaced apart from one another, of which control bodies one (24) controls at least the fluidic connection between supply port (14) and utility port (16), and the other control body (26) controls at least the fluidic connection between utility port (16) and tank port (18).

Abstract: The invention relates to a pilot-controlled directional control valve, in particular a directional poppet valve, comprising a valve housing (10), at least three fluid connection points (12, 14, 16) with a main control stage (18) and a pilot control stage, characterized in that a further fluid-controlling intermediate stage (22) is arranged between the main control stage (18) and the pilot control stage (20) and that the main control stage (18) comprises a longitudinally movable main control piston (24) and the pilot control stage a longitudinally movable pilot control piston (26).

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 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, 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: 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 for use in hydraulic circuits, comprising a valve body (4) which is designed as a cartridge, can be integrated into a housing (6) that has fluid connections (8), and can be fixed in the housing by means of a securing device (20, 26, 28). The invention is characterized in that the securing device has at least one blocking element (20) in the form of a separate component which can be found between the valve body (4) and the housing (6), said blocking element having blocking surfaces that can be moved relative to the longitudinal axis (18) of the valve body (4) between an assembly position which allows 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: 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: 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 inlet aperture (3) is arranged between the fluid inlet (21) and the pilot valve chamber (37), characterised in that a maximum volumetric flow controller (5) is provided in the main piston (27) in an outflow between the pilot valve chamber (37) and the fluid outlet (23).

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 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).