Abstract: A valve device having a valve housing (4), in which a hollow valve part (6) is guided in a longitudinally movable manner, which valve part, controlled by an actuating device (8,14), in at least one open position opens the fluid path through the valve between a fluid inlet (E) and a fluid outlet (A) along a predeterminable flow path for a fluid and in a closed position, in which the valve part (6) is in contact with a valve closing part (10) from which it lifts off in the respective open position, blocks this fluid path, is characterized in that there is at least one flow guide device causing an at least partial reversal of direction in the flow path of the fluid emerging from the valve part (6) as soon as the latter assumes an open position.

Abstract: 1. An adapter device for regulating a control current and method of operating a corresponding adapter device 2. An adapter device is provided for regulating a control current (is) of a magnetic force actuator (32) of a valve (6), having a housing (8), into which the hardware (H) and the software (S) for regulating the control current (is) of the magnetic force actuator (32) of the valve (6) are integrated, and which has a connection device (14) for detachably connecting to the valve (6) and a further connection device (18) for detachably connecting to a connector part (4), which can be used to supply the adapter device with current at least externally.

Abstract: An ultrasonic displacement measurement system for hydraulic accumulators (3) has a movable separating element (5) separating two media chambers (9, 11) from each other in a media-tight manner within a housing (7). One media chamber (9) holds a compressible fluid or an incompressible fluid. The other media chamber (11) holds a compressible working gas. The particular position of the movable separating element (5) within the housing (7) can be detected by an ultrasonic sensor (13) that performs the position detection of the separating element (5) on the side of the media chamber (11) having the compressible fluid. A method for ultrasonic displacement measurement uses that system.

Abstract: The invention relates to an ultrasonic displacement measurement system (1), which in particular can be used for hydraulic accumulators (3) having at least one movable separating element (5), which separates two media chambers (9, 11) from each other preferably in a media-tight manner within a housing (7), wherein the one media chamber (9) holds a compressible fluid or an incompressible fluid and the other media chamber (11) holds a compressible fluid, in particular in the form of a working gas, wherein the particular position of the movable separating element (5) within the housing (7) can be detected by means of at least one ultrasonic sensor (13), is characterized in that the at least one ultrasonic sensor (13) performs the position detection of the separating element (5) on the side of the other media chamber (11) having the compressible fluid. The invention further relates to a method for ultrasonic displacement measurement by means of such a system.