Pressure relief valve
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United States of America Patent
Stats
-
Jan 15, 1980
Issued Date -
N/A
app pub date -
Sep 1, 1978
filing date -
Jul 19, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A safety vent for hopper cars includes a tubular housing member adapted to communicate with the interior of a hopper which may be unloaded by creating a sub-atmospheric pressure therein. The vent includes a rupturable diaphragm normally blocking the entrance of air through the tubular housing to the hopper. The diaphragm comprises a material which is stretched across a tubular wall of the tubular member in a tensioned condition, and which at a predetermined PSI within the hopper, ruptures whereupon the ruptured pieces of the diaphragm recede radially outwardly against the wall of the tubular housing in a manner to occupy a minimal amount of space thereby permitting the free flow of air into the hopper.
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