Abstract: An overfill prevention device for storage tanks includes an elongate tubular housing having a liquid flow passageway. A normally open main valve and a normally closed vapor retaining bleed valve are associated with the fluid passageway. Closure of the main valve interrupts the primary flow of liquid through the passageway and closure of the bleed valve prevents any further liquid from entering the tank and also prevents the escape of vapors from the tank. Operation of the main valve is controlled in significant part by a valve latch assembly which is carried by the housing and a relatch assembly which is carried by the main valve. The relatch assembly ensures operative engagement of the main valve with the valve latch assembly upon movement of the main valve from the intermediate position to the open position. Operation of the main valve and vapor retaining bleed valve is also controlled indirectly by a plurality of floats which are maintained in a float chamber extending adjacent the liquid passageway.

Abstract: A fuel dispensing and vapor recovery nozzle having a fuel passageway therethrough, a main valve in the fuel passageway for controlling the flow of fuel therethrough, a manually operable valve actuating lever for opening the main valve, a venturi responsive to fuel flow through the fuel passageway for creating a vacuum, a shut-off passageway from the venturi to the spout adapted to be closed when the fuel tank is filled, a vapor recovery passageway extending longitudinally therethrough and a check valve in the vapor recovery passageway mounted on the spout and having an open condition allowing vapor to pass therethrough and a closed condition so as to block liquid fuel flow through the check valve and out the spout of the nozzle.