Dual-pressure regulator uses single reference for parallel control of two gases. The regulator uses an external fluid pressure to modulate the flow of one gas, and the regulated flow of the first gas to modulate the flow of the second

Jackson, K.

English

NASA Technical Reports Server

April 1966
	
Brief 66-10167 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Dual Regulator Controls Two Gases from a Single Reference 
Hydrogen 
Water	 Reference 
Reference	 Hydrogen Outlet	 Oxygen Outlet	 Pressure Bellows 
Pressure Bellows
 
=
	
I't"M 
'	 OEM 
iiiiii
I! 
Relief Valve	
Hydrogen Inlet	 Oxygen Inlet	 Relief Valve

Poppet Valves 
The problem: 
To achieve parallel pressure regulation of two gases 
using a single regulating device and a common refer-
ence, while maintaining strict separation of the gases. 
The solution: 
A simple dual-pressure regulator that uses an exter-
nal fluid pressure to modulate the flow of one gas, and 
the regulated flow of the first gas to modulate the flow 
of the second. 
How it's done: 
The dual-pressure regulator uses an internal bel-
lows and poppet valve system to achieve the desired 
regulation. Two normally open plastic seat poppet
valves modulate gas flow through two parallel inlets. 
Water or other fluid fills the reference pressure bel-
lows. The first gas, hydrogen in the illustration, enters 
its inlet port, passes through its poppet valve, and sur-
rounds the reference pressure bellows. Increasing 
hydrogen pressure contracts the bellows to move the 
hydrogen inlet poppet valve in a direction to decrease 
hydrogen flow through the valve into the pressure 
regulator. As hydrogen pressure decreases, the water 
reference pressure bellows expands to move the hy-
drogen inlet poppet valve in a direction to increase 
hydrogen flow through the valve into the pressure 
regulator. 
•	 .	 (continued overleaf 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000166 2020-03-11T17:30:56+00:00Z
Hydrogen in the pressure regulator is conducted 
through interconnecting passageways to the interior 
of the hydrogen reference pressure bellows and the 
hydrogen pressure acts as the reference for the second 
gas pressure, in this case, oxygen. Oxygen enters its 
inlet port, passes through the poppet valve, and sur-
rounds the hydrogen reference bellows. Modulation of 
the oxygen inlet poppet valve is accomplished in the 
same manner for the hydrogen inlet poppet valve 
except that, in this instance, hydrogen is the reference 
pressure and the hydrogen reference pressure bellows 
is contracted and expanded by pressure from the sur-
rounding oxygen. 
A constant pressure in the reference bellows results 
in constant flows from the outlets. Modulation of the 
reference pressure will cause the outlet flows to be 
similarly modulated. Relief valves are provided to 
limit hydrogen and oxygen pressures in the regulator.
Note: 
Inquiries concerning this invention may be directed 
to:
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas, 77058 
Reference: B66-10167 
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code 
GP, Washington, D.C., 20546.
Source: Karl Jackson

of the Garrett Corporation

under contract to

Manned Spacecraft Center

(MSC-227) 
Brief 66-10167	 Category 05


Dual regulator controls two gases from a single reference

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