| 摘要 |
In a fluid pressure booster, an input rod 7 and a valve member 6 are stroked forward during the operation so as to cause a control valve to be switched over. The atmosphere is introduced into a working pressure chamber 30 via the control valve 41 and a power piston 19 then operates to make a negative pressure booster 1 produces an output from a output rod 13. As the atmosphere in the working pressure chamber 30 acts backward on a control piston 25 at this time, the valve member 6 will not be stroke further. However, the output rod 13 is continuously stroked forward and kept producing the output. Due to the stop of stroke of the valve member 6, the stroke of the input rod 7 is suppressed and set at an extremely short stroke. When the negative pressure falls, the negative pressure booster 12 produces an output from the output rod 13 since the input rod 7, the valve member 6 and the output rod 13 integrally give a stroke forward.
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