| 摘要 |
The pressurised gas inlet connector 12 is fixed to the movable annular valve 22 in a radial opening 42 and it contains a stopper 43 with an annular seal 44, this stopper 43 being pushed back into the connector 12 by a part 45 of greater diameter of the central tube 4 in the rest position of the latter and projecting partially to allow the gas to pass by virtue of a part 46 of smaller diameter in the position for drawing off from the central tube 4. <IMAGE>
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