| 摘要 |
A directional control valve for controlling working cylinders, servomotors, or an actuating cylinder of a turbo-machine such as gas and steam turbines, the directional control valve includes a force-regulated magnet and a hydraulic unit. The hydraulic unit includes a pilot piston and a control housing in which the pilot piston is situated so it is displaceable in an axial direction of the directional control valve. The control housing has at least three hydraulic connections including a first pressure connection configured for connection to a hydraulic pressure supply, at least one consumer connection configured for connection to the working cylinder or the servomotor, and a tank connection configured for connection to a hydraulic tank. A flow cross-section between the hydraulic connections being variable by displacement of the pilot piston. The valve also having an actuating unit that includes a control piston, an actuating piston, a first elastic element, a second elastic element and a conductor. The control piston is displaceably located in the control housing or in a flange attached on the control housing. The control piston is displaceable using the force-regulated magnet, the control piston being configured to vary the flow cross-section between an actuating unit pressure connection, an actuating piston connection and an actuating tank connection by displacement. The actuating piston is non-positively and/or positively connected on the pilot piston such that the actuating piston is displaceable in the axial direction of the directional control valve. The actuation piston divides a piston room into a first piston room chamber and a second piston room chamber, the chambers being sealed from one another. The first piston room chamber is hydraulically connected to the actuating piston connection. The first elastic element acts against a hydraulic pressure force in the first piston room chamber. The actuating piston being connected by way of the first elastic element to the control piston or being supported thereon. The second elastic element acts against the hydraulic pressure force in the first piston room chamber. The actuating piston being connected by the second elastic element to the control housing or the flange or being supported thereon. The conductor is situated in a magnetic field of the force-regulated magnet. The force-regulated magnet being an electromagnet configured for electrical activation. The conductor is electrically connected to the electromagnet and a control unit for control of the electromagnet such that the magnetic force and the position of the control piston, the actuating piston, and the pilot piston are regulated by way of a Hall voltage generated in the conductor.
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