Vapor recovery fuel tank system
First Claim
1. A vapor recovery fuel system, comprising:
- a fuel tank having at least one vent opening defined therein;
a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; and
a refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body movable relative to said first float body and engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet after refueling.
1 Assignment
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Accused Products
Abstract
A vapor recovery fuel system includes a fuel tank having at least one vent opening defined therein. A fuel vapor canister is in communication with the vent opening to receive and filter fuel vapors from the tank. A refueling control valve is configured in the vent opening and has a first inlet orifice and an outlet in communication with the vapor trap. The control valve includes a variably buoyant first float body extending into an interior of the fuel tank which rises over a predetermined range of movement in response to increasing fuel level. The control valve includes a second float body engaged by the first float body over at least a portion of its range of movement. The first float body has a buoyancy during refueling so as to rise with increasing fuel level to engage and move the second float body into a sealing position to seal the inlet orifice from the outlet at a predetermined height of fuel within the tank. The first float body has a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in the fuel tank thereby allowing the second buoyant body to lower and unseal the inlet orifice after refueling.
98 Citations
37 Claims
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1. A vapor recovery fuel system, comprising:
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a fuel tank having at least one vent opening defined therein; a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; and a refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body movable relative to said first float body and engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet after refueling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vapor recovery fuel system, comprising:
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a fuel tank having at least one vent opening defined therein; a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; and a refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second buoyant body to lower and unseal said inlet after refueling, said control valve further comprising a rollover mechanism configured with said second float body to automatically move said second float body to said sealing position upon said control valve being inclined to a predetermined angle, wherein said rollover mechanism comprises a rolling weighted body resting on an inclined rolling surface generally below said second float body, said rolling weighted body automatically moving said float body to said sealing position by gravity at said predetermined angle, said inclined surface having an angle which dictates said predetermined angle at which said rollover device actuates. - View Dependent Claims (14)
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15. A vapor recovery fuel system, comprising:
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a fuel tank having at least one vent opening defined therein; a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; a refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second buoyant body to lower and unseal said inlet after refueling; at least one additional vent opening defined in said fuel tank, said refueling control valve further comprising a second inlet in communication with said additional vent opening such that fuel vapors from said additional vent opening pass through said refueling control valve to a vapor trap, wherein said refueling control valve further comprises an automatic isolation mechanism configured therein to isolate said additional vent opening from said vapor trap upon refueling. - View Dependent Claims (16, 17, 18)
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- 19. A refueling control valve for controlling venting of fuel vapors in a fuel system from a fuel tank to a vapor trap during refueling operations to prevent an overfill condition or saturation of the vapor trap, said control valve comprising a first inlet configured to receive fuel vapors and an outlet configured to direct fuel vapors to a vapor trap, said control valve comprising a first float body having a length so as to extend into an interior volume of a fuel tank, said first float body having a first buoyancy characteristic so as to rise over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body movable relative to said first float body and physically engaged by said first float body over at least a portion of said range of movement, said first float body engaging and moving said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for reducing its buoyancy to a second characteristic after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet.
- 27. A refueling control valve for controlling venting of fuel vapors in a fuel system from a fuel tank to a vapor trap during refueling operations to prevent an overfill condition or saturation of the vapor trap, said control valve comprising a first inlet configured to receive fuel vapors and an outlet configured to direct fuel vapors to a vapor trap, said control valve comprising a variably buoyant first float body having a length so as to extend into an interior volume of a fuel tank, said first float body having a first buovancy characteristic so as to rise over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body physically engaged by said first float body over at least a portion of said range of movement, said first float body engaging and moving said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for reducing its buoyancy to a second characteristic after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet, said control valve further comprising a rollover mechanism configured with said second float body to automatically move said second float body to said sealing position upon said control valve being inclined to a predetermined angle, wherein said rollover mechanism comprises a rolling weighted body resting on an inclined rolling surface generally below said second float body, said rolling weighted body automatically moving said second float body to said sealing position by gravity at said predetermined angle, said inclined surface having an angle which dictates said predetermined angle at which said rollover device actuates.
- 29. A refueling control valve for controlling venting of fuel vapors in a fuel system from a fuel tank to a vapor trap during refueling operations to prevent an overfill condition or saturation of the vapor trap, said control valve comprising a first inlet configured to receive fuel vapors and an outlet configured to direct fuel vapors to a vapor trap, said control valve comprising a variably buoyant first float body having a length so as to extend into an interior volume of a fuel tank, said first float body having a first buoyancy characteristic so as to rise over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body physically engaged by said first float body over at least a portion of said range of movement, said first float body engaging and moving said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for reducing its buoyancy to a second characteristic after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet, said control valve further comprising a second inlet configured to be connected in vapor communication with at least one vent opening in a fuel tank, said second inlet in vapor communication with said outlet and disposed so as not to be sealed by said second float body, said control valve further comprising an isolation device for automatically isolating said second inlet from said outlet at a desired point in time during refueling.
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33. A vapor recovery fuel system, comprising:
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a fuel tank having at least one vent opening defined therein; a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; and a refueling control valve configured with said vent opening, said control valve having a first inlet and an outlet in communication with said vapor trap, said control valve comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet after refueling, said second float body having a sealing mechanism for sealing said inlet and a bleed valve mechanism including a needle valve assembly configured to bleed vapor pressure through said sealing mechanism in an over pressure condition in said fuel tank thereby allowing said second float body to fall from said sealing position.
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34. A refueling control valve for controlling venting of fuel vapors in a fuel system from a fuel tank to a vapor trap during refueling operations to prevent an overfill condition or saturation of the vapor trap, said control valve comprising a first inlet configured to receive fuel vapors and an outlet configured to direct fuel vapors to a vapor trap, said control valve comprising a variably buoyant first float body having a length so as to extend into an interior volume of a fuel tank, said first float body having a first buoyancy characteristic so as to rise over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body physically engaged by said first float body over at least a portion of said range of movement, said first float body engaging and moving said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for reducing its buoyancy to a second characteristic after refueling so that it lowers in said fuel tank allowing said second float body to lower and unseal said inlet, said second float body having a sealing mechanism for sealing said inlet and a bleed valve mechanism including a needle valve assembly configured to bleed vapor pressure through said sealing mechanism in an over pressure condition in said fuel tank thereby allowing said second float body to fall from said sealing position.
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35. A vapor recovery fuel system, comprising:
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a fuel tank having at least one vent opening defined therein; a fuel vapor trap in communication with said vent opening to receive fuel vapors from said fuel tank; and a magnetically controlled refueling valve configured with said vent opening, said refueling valve having an inlet in communication with said vent opening and an outlet in communication with said vapor trap, said refueling valve further comprising a magnetically controlled sealing device configured to automatically seal said inlet from said outlet during non-refueling operations and to automatically unseal said inlet from said outlet during refueling, said refueling valve further comprising a variably buoyant first float body extending into an interior volume of said fuel tank which rises over a predetermined range of movement in response to increasing fuel level in said fuel tank during refueling, said control valve further comprising a second float body movable relative to said first float body and engaged by said first float body over at least a portion of said range of movement, said first float body having a buoyancy during refueling so as to rise with increasing fuel level and engage and move said second float body into a sealing position to seal said inlet from said outlet at a predetermined height of fuel within said fuel tank, said first float body having a buoyancy reducing mechanism for automatically reducing its buoyancy after refueling so that it lowers in said fuel tank allowing said second buoyant float body to lower and unseal said inlet after refueling. - View Dependent Claims (36, 37)
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Specification