A durable line valve utilizes stacked metal disks to seal off an inlet port. No packing or shaft sealing is needed, and the valve operates satisfactorily over a wide temperature and pressure range

Mac Glashan, W. F.

English

NASA Technical Reports Server

Housing 
Multiple Discs 
Valve Seat 
Inlet Pc
Outlet Port 
Block
r_ _I4I 
OPEN
I
CLOSED 
March 1964	 Brief 63-10228 
NASA TECH BRIEF 
This NASA Tech Brief is issued by the Technology Utilization Division to acquaint industry 
with the technical content of an innovation derived from the NASA space program. 
Packless Valve with All-Metal Seal Handles Wide Temperature, 
Pressure Range 
The problem: Design of a durable line valve which 
can operate satisfactorily over a wide temperature 
and pressure range and which does not require pack-
ing or shaft sealing. 
The solution: A valve utilizing stacked metal disks 
to seal off an inlet port. No packing or shaft sealing 
is needed. 
How it's done: An inlet port is provided in the 
lower part of the valve body. From the inlet a passage 
turns upward and enters an enclosed cavity. Entrance 
is through a boss, or raised portion, approximately 
centered in the cavity. A circular edge, higher than 
the boss, forms the perimeter of the cavity. 
The valve stem is threaded and goes through to the 
top of the enclosed cavity. Metal disks, resting on the 
raised edge of the cavity, can be bent downward by 
turning the valve handle. Sealing action is obtained 
by turning the valve stem and forcing the bottom disk 
against the inlet hole in the boss. Due to the fact that 
the bottom disk is plated with a soft metal, good seal-
ing characteristics are obtained. An outlet passage 
with a surface lower than the inlet, permits gases or 
liquids to go through the valve when the disks are in 
the open position. 
Notes: 
1. Since this valve operates satisfactorily from 1,0000 F 
down through cryogenic temperatures, it could 
have a number of applications in vacuum or pres-
sure systems which must operate under a wide 
range . of temperature and pressure. 
Industry applications are limited to systems that 
can tolerate a high pressure drop, a characteristic 
of the design. Further development of this valve 
might improve the pressure drop while retaining 
the durability of the packless, metal sealing action. 
Patent status: NASA encourages commercial use 
of this innovation. No patent action is contemplated. 
Source: William F. MacGlashan 
It	 I	 1101 Itl\ J'...i. I I IJ}JUIIIJII L.au.J. aL'.JI y ,J I L.rJIJ I) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States Govern-
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes 
any warranty or representation, express or implied, with respect to the 
accuracy, completeness, or usefulness of the information contained in
this document, or that the use of any information, apparatus, method, 
or process disclosed in this document may not infringe privately-owned 
rights: or B. Assumes any liabilities with respect to the use of, or for 
damages resulting from the use of, any information, apparatus, method, 
or process disclosed in this document.
https://ntrs.nasa.gov/search.jsp?R=19630000025 2020-03-11T16:44:49+00:00Z


Packless valve with all-metal seal handles wide temperature, pressure range

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