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Self-Sealing Cryogenic FittingSelf-sealing fitting for cryogenic tubes remains free of leakage from room temperature to liquid-helium temperature even at internal pressure as high as 2.7 MPa. Fitting comprises parts made of materials with different coefficients of thermal expansion to prevent leakage gaps from forming as temperature decreases. Consists of coupling nut, two flared tube ends, and flared O-ring spacer. Spacer contracts more than tube ends do as temperature decreases. This greater contraction seals tube ends more tightly, preventing leakage.
Document ID
19940000250
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Jia, Lin Xiang
(Florida Atlantic Univ.)
Chow, Wen Lung
(Florida Atlantic Univ.)
Moslemian, Davood
(Florida Atlantic Univ.)
Lin, Gary
(NASA John F. Kennedy Space Center, Cocoa Beach, FL.)
Melton, Greg
(NASA John F. Kennedy Space Center, Cocoa Beach, FL.)
Date Acquired
August 16, 2013
Publication Date
May 1, 1994
Publication Information
Publication: NASA Tech Briefs
Volume: 18
Issue: 5
ISSN: 0145-319X
Subject Category
Electronic Components And Circuits
Report/Patent Number
KSC-11599
Accession Number
94B10250
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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