Pressure relief valve vents at a slow bleed rate at one pressure level and at a higher bleed rate at a higher pressure level. The value housing contains a sleeve, inlet port, outlet port, an orifice, a ball and seat arrangement, and a belleville spring diaphragm

Steeneken, J.

English

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Inlet 
Port
July 1968	 Brief 68-10237 
NASA TECH BRIEF H 
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. 
Dual Rate Pressure Relief Valve 
Outlet 
Port 
Belleville Spring

Diaphragm 
A pressure relief valve has been designed to vent at 
a slow bleed rate at one pressure level and at a higher 
bleed rate at a higher pressure level. The valve housing 
is bored to receive-a sleeve that is free to slide back 
and forth if unrestrained and which closes off or 
opens a passage between inlet port and outlet port, 
depending upon its position. An orifice in the sleeve 
routes the inlet fluid to a ball and seat arrangement 
which communicates with a flow passage leading to 
the outlet port. A conventional spring retains the 
sleeve and the ball/seat arrangement normally 
closed. A belleville spring diaphragm assembly at-
tached to a shaft in contact with the ball senses pres-
sure differential between inlet port and outlet port and 
deflects at a preset inlet pressure to unseat the ball and
permit a slow bleed-off to maintain system pressure 
at the design level. In the event of a surge in inlet 
pressure too great for the ball seat orifice to handle, 
pressure across the sleeve valve element overcomes the 
tension in the conventional spring to a point that 
unseats the sleeve valve element to permit a much 
greater volume of flow and thus quickly return system 
pressure to the design level. 
Note: 
Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas 77058 
Reference: B68-10237
(continued overleafl 
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.
https://ntrs.nasa.gov/search.jsp?R=19680000237 2020-03-12T06:06:03+00:00Z
Patent status: 
No patent action is contemplated by NASA. 
Source: Johannes Steeneken 
of The Garrett Corporation 
under contract to 
Manned Spacecraft Center 
(MSC-11606) 
is- CAS-4ZD' 
R&. 1313	 KSCE1QS. 
Brief 68-10237
Category 05


Dual rate pressure relief valve

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