Feed-thru flange seals inner and outer walls of high vacuum test chambers. It is used in vacuum applications at both cryogenic and higher than cryogenic temperatures. A damaged flange can still be used for partial vacuum, noncryogenic applications in conjunction with an appropriate rubber seal

Yager, S. P.

English

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Ridge 
December 1966	 Brief 66-10615 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Feed-Thru Flange Is Useful in Vacuum Applications to Cryogenic Temperatures 
Flange Body
Metal Gasket	 Rubber Gasket 
(Cryogenic Application)	 (Vacuum Application) 
soft metal gasket is used and the sharp ridge bites 
into the soft metal to form the seal as the capscrews 
are taken up. 
Notes: 
1. Should the metal sealing ridge of the flange be 
damaged in use, the flange can still be used for 
partial vacuum, noncryogenic applications in con-
junction with an appropriate rubber seal. 
2. Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Jet Propulsion Laboratory 
How it's done:	 4800 Oak Grove Drive 
The flange body is made with a sharp, raised ridge	 Pasadena, California 91103 
near its perimeter. In an application at a partial vac-	 Reference: B66-10615 
uum and temperature above cryogenic, a rubber, 	 Patent status: 
0-ring-type gasket is used and the raised ridge acts to	 No patent action is contemplated by NASA. 
entrap the gasket and thus form the seal. In a high	 Source: Stephen P. Yager 
•vacuum /cryogenic temperature application, a flat,
	
	
(JPL.846)
Category 02 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights. 
The problem: 
High vacuum test chambers, being double-walled, 
require sealing flanges with differing qualities for 
inner and outer walls since quite appreciable tempera-
ture/vacuum differentials exist between the two. 
Installation problems would be simplified and ex-
pense reduced if the same basic sealing flange could be 
used for both feed-thrus. 
The solution: 
A flange that can be used without modification of 
its structure for vacuum applications at both cryogenic 
and higher than cryogenic temperatures.
https://ntrs.nasa.gov/search.jsp?R=19660000613 2020-03-11T17:46:18+00:00Z


Feed-thru flange is useful in vacuum applications to cryogenic temperatures

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