| 摘要 |
PROBLEM TO BE SOLVED: To discharge the air in a pattern switch valve to prevent the delay in response. SOLUTION: The connecting relationship of plural remote-controlled valves 21 and plural control valves 22 operated by the pilot pressure liquid supplied from the remote-controlled valves 21, is switched by plural switching pattern passages 24-29. The air in a shared annular passage 24 is removed from the evacuation pattern passages 24, 46, 47 sharing the annular passage 24 of the switching pattern passages 24-29. The air in the shared annular passage 24 can be easily removed by switching from the switching pattern passages 24-29 to the evacuation pattern passages 24, 46, 47, whereby the delay in response between the remote-controlled valves 21 and the control valves 22 caused by residual air can be prevented.
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