F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 31/34 (2006.01) B67D 7/36 (2010.01)
Patent
CA 2059418
A two stage float actuated shutoff valve for preventing overfilling of an underground storage tank has a first float actuated valve flapper movable to a closed position block a major portion of the fuel inlet passage of the underground tank when the level of fuel in the tank rises to a first predetermined level. Closure of the first valve generates an observable water hammer effect signalling that the filling operation should be terminated and at the same time the rate of flow of fuel into the tank is substantially reduced. If the incoming flow is not terminated, the continued rise of the level of fuel in the tank will in time actuate a second float controlled valve to completely close the fuel inlet passage. The incoming fuel is supplied from a delivery truck tank, fuel flowing gravitationally from the truck tank through a manually operable shutoff valve on the tank, a delivery hose and a drop tube which conducts fuel from the delivery hose into the underground tank. Once closed, the second float controlled valve will remain closed as long as the truck tank shutoff valve is open, upon closure of the truck tank shutoff valve the resulting reduction of the hydraulic head on the second valve is reduced to a head which can be overcome by a spring biasing the second valve to its open position so that fuel can be drained from the delivery hose and drop tube into the underground tank. In a second embodiment, tubular floats slidably mounted on the drop tube within the tank independently operate pivoted flapper valves to a closed position within the valve housing, a lower float closing one valve flapper to block a major portion of the incoming fuel flow passage when the level of fuel in the storage tank reaches a predetermined first level and a second upper float closing a second flapper to completely close the flow passage when the level of fuel rises to a predetermined level about the first level. A float actuated locking arrangement for preventing inadvertent premature closing of either valve flapper is disclosed.
Johnson Bruce R.
Leblanc Leo J.
Ebw Inc.
Sim & Mcburney
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