Valve features precise gas-pressure regulation and shuts off flow by remote control. Valve is made up of regulator valve cavity and spring-compression adjusts cavity. Elements in regulator cavity are conventional and include high-pressure inlet, ball which mates with seat, push rod, and pressure-sensing diaphragm

Koch, E. F.

English

NASA Technical Reports Server

Reference 
Spring	 Housing 
Pin	 Slot 
Gear 
Traii
Stepper 
Motor 
Jackscrew 
/Adjustment Cavity 
Spring-Adjusting 
Traverse Nut
Supply 
Pressure 
Inlet	 Push	 Vent Rod /Hole 
S
	 Ball'	 Seat
February 1975	 .	 B74-10298 
NASA TECH BRIEF 
NASA Pasadena Office 
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 program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Remotely Operated Gas-Pressure Regulator and Shutoff Valve 
Pressure-Sensing 
Diaphragm 
Regulator 
Valve Cavity 
Utilization 
Pressure
Valve Configuration 
C
The problem: 
Usually differently designed valves are used to 
provide gas-pressure regulation and to shut off flow. 
Those that do both functions lack the fine precision 
necessary in critical applications and are incapable of 
being operated from a remote location. 
The solution: 
A new valve features precise gas pressure regulation 
and shuts off flow by remote control. 
How it's done: 
The valve as shown in the illustration includes a 
housing which is made up of a regulator valve cavity
and a spring-compression adjustment cavity. The 
elements in the regulator cavity are conventional and 
include a high-pressure inlet, a ball which mates with 
a seat, a push rod, and a pressure-sensing diaphragm. 
The push rod is attached to the diaphragm and bears 
against the ball to open the valve. This occurs when 
the force applied by the. reference spring is greater 
than the regulated gas pressure multiplied by the area 
of the diaphragm. 
In the spring cavity, a spring-adjusting traverse nut 
which is axially translatable serves as a spring stop. 
With the nut in its left position, the spring is 
compressed to apply a reference force needed for 
normal operation as a gas-pressure regulator. As the 
(continued overleaf) 
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Aeronautics and Space Administration. Neither the United States 	 information contained in this documeril, 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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reference spring relaxes, the regulated gas pressure 
multiplied by the diaphragm area required to balance 
the spring force lessens, reducing the regulated gas 
utilization pressure accordingly. Normally this 
balance is set so that the line pressure of the gas 
emerging from the device is held close to 10.4x104 
N/rn2 (15 psi). The intermediate positions of the 
adjustment nut can also be used to apply different 
amounts of force to the diaphragm. This regulates the 
line pressure accordingly. Different springs can be 
used also to obtain desired operational character-
istics. 
When the nut is translated to the extreme right, the 
spring exerts no force on the diaphragm, allowing the 
push rod to withdraw from the ball. The ball then is 
pressed against the seat by the high inlet line pressure, 
cutting off the gas supply. 
The traverse nut is translated axially by means of a 
ball-bearing jackscrew which mates with an internal 
thread in the nut. The screw is rotated through a gear 
train driven by a reversible stepper motor that can be 
operated remotely by wire or by telemety. The nut is 
prevented from rotating with the screw by a pin fixed 
in the housing which mates with a longitudinal slot in 
the nut.
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
NASA Pasadena Office 
4800 Oak Grove Drive 
Pasadena, California 91103 
Reference: TSP74-10298 
Patent status: 
This invention has been patented by NASA (U.S. 
Patent No. 3,856,042). Inquiries concerning non-
exclusive or exclusive licence for its commercial 
development should be addressed to: 
Patent Counsel 
NASA Pasadena Office 
4800 Oak Grove Drive 
Pasadena, California 91103 
Source: Edgar F. Koch of

Caltech/JPL
under contract to
NASA Pasadena Office
(NPO- 13201) 
is 
F_ ' 
Categories: 07 (Machinery) 
B74-10298
	
06 (Mechanics)


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