| 摘要 |
A line pipe for the transport of deep-frozen media, consisting of at least two corrugated metal pipes ( 2, 4 ) arranged concentrically and at a distance from one another, an insulation layer ( 3 ) being arranged in the annular gap between the two metal pipes ( 2, 4 ), the annular gap being evacuated, and a closing valve ( 10 ) provided in the outer metal pipe ( 4 ) being connectable to a vacuum pump, the closing valve being welded, vacuum-tight, into a smooth-walled metal pipe ( 9 ) welded, vacuum-tight, to the exterior of the metal pipes ( 4 ). The valve body ( 10 ) of the closing valve projects into the interior of the smooth-walled metal pipe ( 9 ) and is flush with the outer surface area of the smooth-walled metal pipe ( 9 ).
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