| 摘要 |
The direction of rotation of the third thread (22) of the main valve part (8) is opposed to that of the second thread (21) of the closure (7), so that a torque applied to the main valve part, which contributes to the loosening of the closure on the Dewar flask, tightens the main valve on the closure. The main valve part is fixed to the closure with the aid of a nut (23).
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