| 摘要 |
The present invention relates to a check-valve assembly appropriately used in a vacuum system. The check-valve assembly of the present invention comprises a body having a plurality of through-holes formed therein while having different space characteristics. As a valve member rotates with a shaft fixed to the body, intake holes of the valve member selectively communicate with the through-holes. Accordingly, the check-valve assembly of the present invention can advantageously, properly, and promptly take action in accordance with a vacuum characteristic required on site. |
