Two-stage pressure relief valve
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United States of America Patent
Stats
-
Jul 12, 1983
Grant Date -
N/A
app pub date -
May 15, 1981
filing date -
May 15, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-stage valve adapted for use in downward flow in the fuel line of a vehicle to provide roll-over protection, comprising a housing having two ball check valves axially disposed to normally check upward flow, the lower ball being expansion-biased spring-loaded, the upper ball being loaded with an expansion-biased spring resting upon the lower ball, the lower ball being larger than the upper ball, and the upper spring having a lower spring force than the lower spring.
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