Patent ID: 7509982

Claim:
An ORVR compatibility assembly for use in a fueling system in which fuel from a storage tank is pumped through a hose to a nozzle for discharge into a fuel tank of a vehicle, the fueling system including a vapor recovery system to recover fuel vapors displaced from the fuel tank during fueling, the assembly comprising: a primary vapor passage adapted to be in fluid communication with the vapor recovery system; a valve assembly moveable between first and second positions, the first position permitting the uninterrupted flow of vapors through the primary vapor passage and the second position inhibiting the flow of vapors through the primary vapor passage, the valve assembly being biased toward the first position; a diaphragm mounted within a chamber; a sealing member coupled to the diaphragm; a secondary vapor passage in fluid communication with a first side of the diaphragm and the primary vapor passage; an air bleed passage communicating a second side of the diaphragm and the valve assembly; the diaphragm being moveable between open and closed positions, the sealing member in the closed position closing the air bleed passage and in the open position opening the air bleed passage to ambient atmosphere, the diaphragm being biased toward the closed position; and wherein when the pressure on the first side of the diaphragm is reduced to a predetermined level, the diaphragm with the sealing member moves from the closed position to the open position so that the valve assembly is moved from its first position to its second position to inhibit flow through the primary vapor passage and vent the primary vapor passage through the air bleed passage when the diaphragm with the sealing member moves to the open position.