| 摘要 |
<p>An air pressure stabiliser device is adapted to be located in an aperture (6) in a wall, which may be provided by ductwork, extending into and from a room within which the pressure is to be maintained in excess of atmospheric pressure, but which is vented when the pressure rises above a predetermined maximum. The stabilising device comprises two bearing assemblies (8), defining a longitudinal axis (10), and a control member (12) extending between the bearing assemblies (8), being supported thereby for rotation about said axis. Adjustment means (40, 40a, 41, 50, 51) are provided positionally to adjust the control member in a direction extending at right angles to the pivot axis, to adjust the excess pressure to which the control member responds and the threshold opening pressure. These adjustment means are provided to enable the control member to open fully in response to the detection of the desired excess pressure within the room being controlled.</p> |
