| 摘要 |
A cryogenic reservoir comprising an internal reservoir and an external reservoir with vacuum insulation between them, (2, 5, 11 Figure 1) is provided with a plug-valve 17 in conduit 12 passing through the external reservoir, this plug valve (17) incorporating a trapping agent 20 of the desorption gases, as a getter, in a recess above a permeable retaining wall 21. If accidental overpressure occurs in the intermediate vacuum space, due to an escape from the internal reservoir, the "getter" is ejected to a distance with the plug valve 17, which avoids any dangerous reaction between the getter and the cryogenic fluid, which can for example be oxygen. The plug-valve is normally held in a sealing position with sealing ring 15 seating on seat 14 in conduit 12 due to the vacuum in the space 11 between the reservoirs. In space 11 a spiral reheating tube is preferably provided. <IMAGE>
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