| 摘要 |
<p>The device has a valve flap (6, 7) that is opened by air flow streaming in an air way (4) against a closing force. The flap has a flap edge (12) that faces a closing surface (14) of the airway with play, in a closing position of the flap. A stopper device (26) is provided to define the closing position, where an extension of the stopper device in a direction of pathway of the edge is smaller than the length of the edge.</p> |
