| 摘要 |
PROBLEM TO BE SOLVED: To easily prevent the putrefaction of hydraulic water without affecting an environment, etc. SOLUTION: The water pressure driving system actuates an actuator cylinder by using the hydraulic water 100. In this case, silver is used on the surface of a strainer 10 for removing unnecessary matter in the hydraulic water 100 in a tank 1 and a filter 20 for removing unnecessary matter in the hydraulic water 100 returned into the tank 1 contacting with the hydraulic water 100. In this way, a silver ion is eluted into the hydraulic water 100.
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