Fluid-flow restrictor has degree of restriction easily and accurately controlled during manufacture. Restrictor's flow channel is machined square thread around a solid slug which is shrink-fitted to cylindrical case. One end of case is closed, open end capped, and both ends tapped for tube fittings for fluid flow

Sheere, R. W.

English

NASA Technical Reports Server

December 1970	 Brief 70-10679 
NASA TECH BRIEF H 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the National Technical Information Service, Springfield, 
Virginia 22151. Requests for individual copies or questions relating to the Tech Brief progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Compact Fluid-Flow Restrictor 
.
A new, compact fluid-flow restrictor has a degree of 
restriction that can be easily and accurately controlled 
during manufacture.
Cap 0-Ring
ap 
Lap ana biug 
Longitudinal Section 
Conventional restrictors are made from tubing, the 
bore of which may vary by as much as 15%. This varia-
tion causes considerable waste because the only 
lengths that can be used are those having the required 
bore. 
The new restrictor's flow channel is an accurately 
machined square thread around a solid slug which is 
shrink-fitted to a cylindrical case. One end of the case 
is closed, and the open end is capped (see fig.). The
thread becomes a spiral passage within the case, and 
the interference between the case and the slug 
is 0.007 in. or less. The ends of the case are drilled 
and tapped for tube fittings to allow fluid flow. 
Because of the relatively great length of the spiral 
passage, its cross-sectional area can be made larger 
to reduce the likelihood of clogging. Shrink-fitting 
the slug inside the case may be facilitated by tapering 
both components. 
Note: 
No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center, Code BM7 
Houston, Texas 77058 
Reference: B70-10679 
Patent status: 
No patent action is contemplated by NASA. 
Source: R. W. Sheere of 
North American Rockwell Corp. 
under contract to 
Manned Spacecraft Center 
(MSC- 15803) 
Category 07 
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.
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Compact fluid-flow restrictor

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