Abstract: A pneumatic valve, in particular a pneumatic proportional pressure control valve includes a valve housing (3), in which a piston valve element (5) is guided in a guide (7) under the effect of an actuating device (9) and of a restoring device (11). The restoring device exerts a spring force and acts on the valve element (5) counter to the applied magnetic force (FB) of the actuating device (9). The valve element controls a media flow between a first media connection (13) and a second media connection (15) on the valve housing (3). With the actuating device (9), the valve element (5) establishes a media-conducting connection (17) between the respective media connections (13, 15), while allowing for the forces prevailing, on the basis of the applied pressures multiplied by the respective pressure-active surfaces, the spring force, the flow forces and the magnetic force.

Abstract: A pneumatic valve, in particular a pneumatic proportional pressure control valve, comprising a valve housing (3), in which a piston-like valve element (5) is guided axially movably in a guide (7) and, under the effect of an actuating device (9) for the valve element (5) and of a restoring device (11), which exerts a spring force and acts on the valve element (5) counter to the applied magnetic force (FB) of the actuating device (9), controls a media flow at least between at least a first media connection (13) and a second media connection (15) on the valve housing (3), is characterized in that, with the activation of the actuating device (9), the valve element (5) establishes a media-conducting connection (17) between the respective media connections (13, 15), while allowing for the forces prevailing, on the basis of the applied pressures multiplied by the respectively pressure-effective surfaces, the spring force, the flow forces and the magnetic force.

Abstract: The invention relates to a drive system having at least one hydraulic actuator (2), which is supplied with pressure medium (4) by means of at least one pressure-medium pump (3) in a main circuit, the pressure-medium pump (3) being a rotational-speed-controlled pressure-medium pump that is driven by a motor (5) at a variable rotational speed and a controlled torque, said drive system being characterized in that leakage fluid (7) that escapes from a displacement chamber (6) of the pressure-medium pump (3) is discharged through a fluid-conducting connection (8) having at least one check valve (9, 16), and the at least one check valve (9, 16) is installed in the fluid-conducting connection (8) in such a way that the check valve prevents pressure medium from flowing back out of the main circuit into the displacement chamber (6) or another interior chamber of the pressure-medium pump (3) and feeds leakage fluid (7) into the main circuit of the drive system (1) when there is a slight excess pressure.

Abstract: A valve device for a hydraulic circuit (10) divides the incoming volume flow into at least two pre-determined partial flows for supplying hydraulic consumers (V1, V2) of the circuit (10) and has at least one pressure balance (16) and at least one orifice. Since the orifice is embodied as a variable orifice (32) controllable by a proportional magnet (34), the opening area of the orifice varies. A flow regulator is then realized and can switch the regulated volume flow and/or proportionally adjust the regulated volume flow in a defined manner.

Abstract: The invention relates to a valve device for a hydraulic circuit (10), which valve device divides the incoming volume flow into at least two pre-determined partial flows for supplying hydraulic consumers (V1, V2) of the circuit (10), which valve device has at least one pressure balance (16) and at least one orifice. As a result of the fact that the orifice is embodied as a variable orifice (32) which can be controlled by means of a proportional magnet (34) in such a way that the opening area of said orifice varies, a type of flow regulator is realized which can switch the regulated volume flow and/or proportionally adjust the regulated volume flow in a defined manner.