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A remote delivery tube with an integral Joule-Thompson valve for the helium liquefier

Jacob, S and Kasthurirengan, S and Karunanithi, R and Raguraman, R (1992) A remote delivery tube with an integral Joule-Thompson valve for the helium liquefier. In: Review of Scientific Instruments, 63 (3). pp. 2097-2098.

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Remote delivery tubes (RDTs) in Collins and similar types of helium liquefiers interconnect the liquefier with the storage dewar. In these liquefiers the Joule-Thompson (J-T) valve is separately situated in the liquefier cryostat. Therefore there is a regime of J-T heating during the initial cool down of the liquefier, since there is a time lag in reaching the inversion temperature for the J-T valve. The note describes the design, fabrication, and testing of a RDT with an integral J-T valve. A demountable copper cold seal working at a pressure of 15 bar was successfully tested. The J-T valve seat made of Cu-Cr-Zr alloy provided excellent sealing with the stainless-steel valve tip at liquid-helium temperatures. The testing of this RDT with integral J-T showed substantial reduction in cool down time for the liquefier as well as better control of the dewar pressures.

Item Type: Journal Article
Publication: Review of Scientific Instruments
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Date Deposited: 10 Oct 2006
Last Modified: 02 May 2011 09:04
URI: http://eprints.iisc.ac.in/id/eprint/8804

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