SHUTOFF VALVE FOR MECHANICALLY SEALED ORVR SYSTEM

摘要

A vapor vent/tipping valve has a diaphragm with a bleed therethrough responsive to the differential pressure of bleed flow to control vapor venti ng to the canister and vapor recirculation to the filler tube. A dip tube causes risin g fuel in the tank to close the dip tube and prevent vapor flow to the diaphragm bleed thereby starving the recirculation line and allowing nozzle discharge to create a vacuum in the filler and effect nozzle shutoff. Alternatively, float operate d shutoff valves may be employed in the dip tube and vapor vent chamber inlet. The shutoff valves may include inertial members for closing the float valves to afford tipping/rollover protection.