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Development of a low-dissipation valve for use in a cold-cycle dilution refrigerator

✍ Scribed by Franklin K. Miller; J.G. Brisson

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 379 KB
Volume: 39
Category: Article
ISSN: 0011-2275
DOI: 10.1016/s0011-2275(99)00104-6

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✦ Synopsis

A low-dissipation valve for use at helium temperatures, which uses a polished stainless steel valve head and a PCTFE seat for the sealing surfaces, has been developed and tested. The leak rate with a closing force of 10 kgf and a dierential pressure of 8000 Pa across the valve was experimentally determined to be approximately 0.2 lmol/s of gaseous helium at 4.2 K. Estimates of dissipation obtained using ®nite element analysis and experimental results from bellows tests suggest that this valve has energy dissipation on the order of 2 lJ per cycle. The valve is found to be suitable as a compressor valve for a previously proposed cold-cycle dilution refrigerator (CCDR) as well as other refrigeration cycles that require low temperature valves.

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