| 摘要 |
An adjusting damper (1), preferably for ventilation plants and intended to be disposed in association with a duct (3), preferably in the vicinity of the duct's opening (8) into a connecting box (5), comprising a control means (15) which is arranged to be movable for the control of the gas flow rate through the duct (3). The control means (15) is axially movable along a tubular envelope (10) of a porous material which permits the through passage of the gas. The interior of the envelope (10) communicates with the duct (3). The flow rate through the duct (3) is controlled by the movement of the control means (15) so as to vary the surface area of the envelope (10) through which the gas passes, and hence the pressure drop across the adjusting damper (1). |
