| 摘要 |
A hydraulically-operated breaking device of this invention uses a hydraulically-operated differential piston for driving an electric circuit switching unit, and making and breaking pilot valves for actuating the differential piston. In this device, a control valve operated by the action of the pilot valves includes two poppet valves, and drives an intermediate valve which drives the differential piston. Further, the control valve can perform a quick operation at breaking, and can accomplish a given operation even with use of impulse command signals to operate the pilot valves or even in case of a liquid pressure drop during the operation. Furthermore, the use of an auxiliary valve and an auxiliary switch provides the device with a simultaneous action preventive function, pumping action preventive function, and breaking operation preference function.
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