| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a jumping preventing device for a fluid pressure actuator having a wide range of choice for a main selector valve although its structure is comparatively simple. SOLUTION: This jumping preventing device 1 is arranged between a fluid pressure actuator 2 and a main selector valve 17. A first valve part 31 communicates a high pressure side out of two passages 52, 53 branched from both main channels 8, 10, and normally outputs pressure fluid led to flow on the high pressure side to an output side. A second valve part 32 is changed over to a jumping preventing condition and a normal use condition. In the former condition, the secondary side areas of the both main channels 8, 10 and the output side of the first valve part 31 are communicated with each other, and the both primary and secondary side areas of the both main channels 8, 10 are disconnected from each other. In the latter condition, the secondary side areas of the both main channels 8, 10 and the output side of the first valve part 31 are disconnected from each other, and the primary and secondary side areas of the both main channels 8, 10 are communicated with each other. A on-ready-timer part 33 is turned ON after the lapse of a predetermined time from a point of time when fluid supply is started, and changes over the second valve part 32 from the jumping preventing condition to the normal use condition.</p> |
