초록 ▼

A vapor vent valve (16) comprises a housing (28) the interior of which is divided into two fluid chambers (32, 34) by a movable wall (30). The first chamber (32) provides a closable junction in the vapor recovery passageway (18, 20) between a liquid fuel tank (10) and a vapor storage canister (22).

A vapor vent valve (16) comprises a housing (28) the interior of which is divided into two fluid chambers (32, 34) by a movable wall (30). The first chamber (32) provides a closable junction in the vapor recovery passageway (18, 20) between a liquid fuel tank (10) and a vapor storage canister (22). The second chamber (34) has a combined inlet/outlet (38) which is interconnected with a signal pressure region (44) in the fuel tank fill tube (12) adjacent to the fill tube cap (14). A valve plug (36) is fixed to the movable wall (30) so that when the pressure in the first fluid chamber (32), the signal pressure region (44 ) and the second fluid chamber (32) are substantially equivalent, the valve plug (36) is positioned to close the vapor recovery passageway (18, 20). When the closure cap (14) is removed, a fill nozzle (46) is inserted into the fill tube (12 ), and liquid fuel is being delivered into the fuel tank (10), the pressure in the signal pressure region (44) and the second fluid chamber (32) decreases relative to that in the tank (10) and the first fluid chamber (34), the movable wall (30) is displaced from its normal position causing the valve plug (36) to open the vapor recovery passageway (18, 20) between the fuel tank (10) and the vapor storage canister (22).

대표청구항 ▼

A refueling vapor recovery system, comprising: a liquid fuel tank including a fill tube having an inlet into which a liquid fuel fill nozzle is inserted for introduction of liquid fuel into said fuel tank, and a removable closure cap for said fill tube; a vapor storage means; a vapor recovery passag

A refueling vapor recovery system, comprising: a liquid fuel tank including a fill tube having an inlet into which a liquid fuel fill nozzle is inserted for introduction of liquid fuel into said fuel tank, and a removable closure cap for said fill tube; a vapor storage means; a vapor recovery passageway extending from the fuel tank to the vapor storage means; a signal pressure region in said fill tube which is at an elevated first pressure when the closure cap is installed on the fill tube and there is vapor pressure within the fuel tank, and which is at a second lower pressure when the closure cap is removed and liquid fuel is being introduced into the fill tube; vapor valve means within said vapor recovery passageway; and control means for said vapor valve means functioning to close said vapor valve means in response to the signal pressure region being at said first pressure, and to open the vapor valve means in response to the signal pressure region being at said second pressure, and wherein liquid fuel being introduced into the fuel tank when the vapor valve means is open displaces vapor out from said fuel tank through the vapor recovery passageway to the vapor storage means.