Automatic overfill prevention system
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United States of America Patent
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-
Sep 13, 1988
Grant Date -
N/A
app pub date -
May 15, 1987
filing date -
May 15, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic overfill prevention system for gravity filling of an underground liquid storage tank from a tank truck fill line provides a venturi in the fill line creating a partial vacuum which is vented from the liquid storage tank through a vent line until the liquid in the storage tank rises to a predetermined level to submerge one end of the vent line and trigger a latching means to close the fill line. The assembly also includes a containment manhole to hold any inadvertent spillage occurring during the filling process.
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