| 摘要 |
PURPOSE: A valve for measuring an extremely low temperature with a vacuum insulation function is provided to semi-permanently maintain the insulation function of the valve using a semi-permanent insulation case. CONSTITUTION: A valve for measuring an extremely low temperature with a vacuum insulation function comprises a vacuum insulation structure. The vacuum insulation structure is composed of a valve body(1), a spindle washer(2), spindle seals(3,4), a spindle(5), a spindle cap(6), a handle(7), a tablet(8), a spring washer(9), a nut(10), first bushings(11) for welding, a second bushing(12) for vacuum brazing, and vacuum cases(13). The vacuum insulation structure is formed through a vacuum brazing method which connects the valve body and the vacuum cases.
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