| 摘要 |
The invention relates to an air blast device comprising an air flow control device disposed between an inlet conduit and an outlet conduit. The control device comprises an evacuation valve (16) that controls the flow of the air contained in a rear chamber to the outlet conduit (5). The air contained in the rear chamber serves to hold a main valve (2A) in its seat (2B).This blast device is characterized in that a seat (17) of an evacuation valve is located at the level of a front face (2C) of the main valve (2). In order to evacuate air contained in the rear chamber, evacuation valve moves toward the front in the direction opposite that of the main valve (2A) as it leaves its seat (2B).
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