| 摘要 |
<p>A regulator controls the flow of gas from an environment, through a region and to an evacuation means. The regulator's fluid path is bounded on opposite sides by two hingedly mounted parallel plates (51, 55). Each of the plates have a conduit side (52, 56), facing the fluid path (10), and a reference side (53, 57) facing a reference pressure. The first plate's reference-pressure side may be exposed to the region's pressure, and the second plate's reference-pressure side may be exposed to the environment's pressure. The regulator also includes an impeder (96, 97) which includes a fixed grate (97) and a movable grate (96) hingedly attached to the plates at points (86, 87) distal from the pivot points (84, 85). As the movable grate moves with respect to the fixed grate the impedance on the flow varies.</p> |
