| 摘要 |
The invention relates to an electrohydraulic valve system comprising a feeding duct (P), a working duct (A), and a discharge duct (T), a first and a second valve mechanism (20, 30), each of which is provided with a valve piston (3.1), a control device, and a magnetic regulating device for impinging the valve piston (3.1, 3.2) with a controlled actuating force. The first and the second valve mechanism (20, 30) are placed parallel to each other. The first valve mechanism or the second valve mechanism is active and performs the function of the electrohydraulic valve system while the other valve mechanism is passive during operation. The control device of the active valve mechanism activates the passive valve mechanism and deactivates itself when said control device recognizes a fault while the control device of the passive valve mechanism activates itself and deactivates the active valve mechanism when the control device of the passive valve mechanism recognizes a fault. Deactivation of a valve mechanism comprises moving the valve piston of said valve mechanism to the neutral hydraulic position by means of an apparatus that is separate from the magnetic regulating device.
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