| 摘要 |
<p>Air is dehumidified in a polymer-membrane-type air drier and sent to an air tool in which air is employed for various purposes. A selector valve is connected to the air drier and a purge-control valve connected to a purge outlet of the air drier. When the air tool is not used to allow air pressure in the selector valve to become greater than a certain value, air is sent to the purge-control valve from the selector valve, which is closed to make it impossible for air from the purge outlet of the air drier to be purged through the purge-control valve.</p> |
