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A cryogenic valve for spacecraft applicationsSpace-compatible cryogenic valves are now required to operate between room and liquid helium temperatures. A remotely controllable cryogenic valve is described, which is made of bellows-type stainless steel and is operated by a miniature dc motor with integral gearset (485:1) at a nominal voltage of 28 Vdc. The power transmission provides a further reduction of 7.2:1 to give an overall gear ratio of nearly 3500:1, assuring reliability of operation at low temperatures. Valve performance (leak rate) data are presented at LN2, LHe, and SfHe temperatures at delivered torques of 18, 27, 31, and 35 N-m. At a closing torque of 31 N-m, a leak rate of 0.028 scc/sec was achieved at 2 K, while at a torque of 18 N-m the leak rate at 300 K was less than 3 x 10 to the -9th scc/sec.
Document ID
19820034236
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Salerno, L. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Spivak, A. L.
(Transbay Electronics, Inc. Richmond, CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Engineering (General)
Report/Patent Number
AIAA PAPER 82-0077
Meeting Information
Meeting: Aerospace Sciences Meeting
Location: Orlando, FL
Start Date: January 11, 1982
End Date: January 14, 1982
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
82A17771
Distribution Limits
Public
Copyright
Other

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