| 摘要 |
PROBLEM TO BE SOLVED: To further reduce a pressure loss while a shut damper is located at an opening position.SOLUTION: A shut damper 20 includes: a damper body 22 as a skeleton part; and a seal art 27 which is formed integrally with the damper body 22 so as to extend along at least an outer edge of the damper body 22 and is softer than the damper body 22. The seal part 27 includes: a front end seal portion 31 in contact with an inner wall surface 14a of a lateral wall part 14 of a retainer 10 at a closing position; and a flexible connection portion 35 connecting the front end seal portion 31 and the damper body 22. The front end seal portion 31 includes a cross section CS that is formed from a protrusively curved portion 32 and brought into contact with the inner wall surface 14a in the curved portion 32. In the connection portion 35 connected to the front end seal portion 31 in contact with the inner wall surface 14a, at least a portion in a length direction of the connection portion 35 includes a gradually thickness increasing portion 36 of which the thickness is gradually increased as it becomes closer to the damper body 22. |
