| 摘要 |
The invention relates to an airflow controlling valve device of the disc-type that may be used either as a supply air device or as an exhaust air device. Backwards from a disc (9), a sleeve (10) extends, which is insertable with an air-tightening fit in an air-carrying duct (5), a filter (2) including a covering (26) with same cross-section shape as the sleeve being detachably mounted inside the sleeve, the covering being inserted with an air-tightening fit in the sleeve. Furthermore, the disc (9) has a lower flange (16) which extends backwards from a lower edge portion and is arranged to co-operate with a lower flange (22) of a fastening plate (3), said flanges overlapping each other in order to make airflow in the direction downwards from the disc impossible, irrespective of the axial setting of the disc. |
