Shutoff valve for mechanically sealed ORVR system
AssigneeEaton Corporation
InventorsCraig Allman, Daniel Pifer, Russell Jahnke
Life of this patent
Estimating the term…
Abstract
A vapor vent/tipping valve has a diaphragm with a bleed therethrough responsive to the differential pressure of bleed flow to control vapor venting to the canister and vapor recirculation to the filler tube. A dip tube causes rising 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 operated 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.
Claims15
Combined vapor vent/tipping and shutoff valve assembly for use in a fuel tank comprising:
- (a) a housing defining a vapor chamber having an inlet for receiving fuel vapor from the tank and a vent outlet adapted for connection to a vapor storage device, said housing further defining a recirculation chamber having an outlet adapted for connection to a fuel tank filler tube.
- (b) a valve member disposed in said chamber and moveable therein for controlling flow between said inlet and said vent outlet;
- (c) a dip tube associated with said housing and communicating with said recirculation chamber and adapted for venting vapor until liquid fuel covers the end thereof;
- and,
- (d) pressure responsive means disposed in said recirculation chamber defining a flow restriction between said dip tube and said recirculation chamber outlet and operative for effecting movement of said valve member in response to a difference in pressure forces across said flow restriction acting on said pressure responsive means;
A method of controlling vapor emission from an engine fuel tank comprising:
- (a) forming a vapor chamber in a valve housing;
- (b) disposing a fluid pressure responsive member in the chamber and partitioning said chamber and forming a vent chamber and a recirculation chamber and connecting an inlet in said vent chamber to said tank and an outlet in said vent chamber to a vapor storage device;
- (c) disposing a moveable valve member in said vent chamber and operatively connecting said valve member to said pressure responsive member and moving said valve member in response to a differential of pressure forces across the pressure responsive member;
- (d) forming a bleed path from said vent chamber to said recirculation chamber and connecting said recirculation chamber to the upper end of a filler tube in the tank;
- and,
- (e) disposing a dip tube on said housing and positioning an end of the dip tube to a predetermined fill level in the tank and communicating said tube with said vent chamber.
Dependencies are inferred from the claim text.