| 摘要 |
The obturator has an insert (1) to be mounted in the duct (2) and has a tubular body (1) with a frontal section (3) which is closed and a rear section (5) with an open central passage (5). The gas flow through the duct flows between the external face of the front part and the internal face of the central part to the rear. A blocking stop (7) is lodged in the front part during removal flow and can be displaced to block the central passage when released by a fluid shock. |
