Overfill prevention mechanism for storage tanks
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United States of America Patent
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-
Jul 2, 1991
Grant Date -
N/A
app pub date -
May 1, 1990
filing date -
May 1, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A float chamber located in generally parallel, laterally spaced relationship to the main liquid flow passageway contains superimposed floats that move along a substantially linear path of travel. The floats cooperate with other control components to effect closure of a main valve assembly when the liquid level adjacent the mechanism reaches a preselected first elevation, and to close a bleed valve assembly when the liquid level reaches a second, higher elevation. The main valve assembly includes a movable plate valve that is spring biased toward an open position and that is biased toward a closed position by the force of liquid adjacent thereto and upstream therefrom. A latch and associated catch prevent movement of the valve plate to its closed position until such time as the liquid level reaches the first elevation.
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