| 摘要 |
In the closure (7) is a seal and a ventilating hole (23). In the vicinity of the ventilating hole is a particularly arc-shaped recess, comprising a zone of the closure in which the closure thread is taken away, in order to create a channel for gas-form cold producing medium, so that with the closure on the Dewar flask (6) loosened gas-form cold production medium can escape past the seal, either through the ventilating hole (23) or through the recess, in order to reduce the pressure in the Dewar flask. The hole in an upper side of the closure is directly above the recess. |
