Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – Level or overflow responsive
Patent
1995-06-05
1997-03-25
Jacyna, J. Casimer
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
Level or overflow responsive
141 5, 141209, 141215, B67D 500
Patent
active
056135351
ABSTRACT:
A fuel dispensing unit shutoff switch is provided, the switch comprising: a fuel supply nozzle, having a fuel supply outlet, capable of being inserted into a fuel tank inlet conduit of a vehicle; a plurality of vacuum conduits, each vacuum conduit providing communication between a volume in the vicinity of the fuel supply nozzle outlet, and sources of essentially equal negative pressures; a differential pressure sensor having a plurality of inputs with each input being a point along a different vacuum conduit, and an output signal that is activated when the pressures of the vacuum conduits at the differential pressure sensor inputs differ by more than a threshold amount of differential pressures; and a means effective to stop fuel flow when the output signal is activated. The sources of equal negative pressures are preferably one or more venturies in the fuel supply nozzle, and the threshold amount of differential pressure is preferably between about 0.1 and about 3 inches water of differential pressure.
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Technology, "Pumping Gas in the Year 2000," by Klaus-Ulrich Blumenstock and Konstantin Tschovikov, 3 pp.
Christensen Del S.
Jacyna J. Casimer
Shell Oil Company
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