| 摘要 |
<p>The switching device according to the invention supplies at least two nozzles. It includes outlet chambers (3, 4) connected to the nozzles, feed chambers (7, 8) connected to gas (G) inlet pipes, and a movable bar (2), the position of which makes it possible selectively to close either one or other of the partitions (9, 10) separating the outlet chambers (3, 4) from the feed chambers (7, 8). The movable bar (2) contains bypass pipes (25, 26) connecting the outlet chambers (3, 4) to blocking chambers (21, 22) closed by valves (17, 18), the blocking chambers (21, 22) being separated from the feed chambers (7, 8) each by a movable partition (23, 24) integral with the movable bar (2). <IMAGE></p> |
