US20120318794A1 - Lever based grade vent valve - Google Patents

Lever based grade vent valve Download PDF

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Publication number
US20120318794A1
US20120318794A1 US13/163,926 US201113163926A US2012318794A1 US 20120318794 A1 US20120318794 A1 US 20120318794A1 US 201113163926 A US201113163926 A US 201113163926A US 2012318794 A1 US2012318794 A1 US 2012318794A1
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US
United States
Prior art keywords
lever
float
vent valve
valve assembly
orifice
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/163,926
Inventor
Lalit Murlidhar Patil
Dan Pifer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Corp
Original Assignee
Eaton Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Priority to US13/163,926 priority Critical patent/US20120318794A1/en
Assigned to EATON CORPORATION reassignment EATON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PIFER, DAN, PATIL, LALIT MURLIDHAR
Priority to EP12750803.4A priority patent/EP2720896A2/en
Priority to JP2014516450A priority patent/JP2014525005A/en
Priority to AU2012273695A priority patent/AU2012273695A1/en
Priority to KR1020137034302A priority patent/KR20140034858A/en
Priority to PCT/IB2012/001189 priority patent/WO2012176036A2/en
Priority to BR112013029427A priority patent/BR112013029427A2/en
Priority to CN2012102755295A priority patent/CN102865403A/en
Priority to CN201220383901XU priority patent/CN203051873U/en
Publication of US20120318794A1 publication Critical patent/US20120318794A1/en
Abandoned legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04Devices, e.g. valves, for venting or aerating enclosures for venting only
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K24/00Devices, e.g. valves, for venting or aerating enclosures
    • F16K24/04Devices, e.g. valves, for venting or aerating enclosures for venting only
    • F16K24/042Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float
    • F16K24/048Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float a transmission element, e.g. arm, being interposed between the float and the valve element, the transmission element following a non-translational, e.g. pivoting or rocking, movement when actuated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03Fuel tanks
    • B60K15/035Fuel tanks characterised by venting means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03Fuel tanks
    • B60K15/035Fuel tanks characterised by venting means
    • B60K15/03519Valve arrangements in the vent line
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03Fuel tanks
    • B60K2015/03256Fuel tanks characterised by special valves, the mounting thereof
    • B60K2015/03289Float valves; Floats therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03Fuel tanks
    • B60K2015/03328Arrangements or special measures related to fuel tanks or fuel handling
    • B60K2015/03388Arrangements or special measures related to fuel tanks or fuel handling in case of a roll over of the vehicle
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03Fuel tanks
    • B60K15/035Fuel tanks characterised by venting means
    • B60K2015/0358Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts
    • B60K2015/03585Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts by gas pressure

Definitions

  • the invention generally relates to a grade vent valve assembly, sometimes referred to as a roll-over vent valve assembly.
  • Vehicular fuel systems include a fuel tank having a grade vent valve assembly.
  • the grade vent vale assembly opens fluid communication between the fuel tank and other components of the fuel system to allow pressurized fuel vapor to escape the fuel tank under normal conditions, and closes fluid communication between the fuel tank and the other components of the fuel system to prevent liquid fuel from flowing out of the fuel tank when the vehicle is at an extreme angle or in an inverted position, i.e., in a rolled-over position.
  • a grade vent valve assembly for a fuel tank of a vehicle is provided.
  • the grade vent valve assembly includes a housing.
  • the housing defines a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber.
  • a float is disposed within the float chamber. The float is moveable between a lowered position and a raised position.
  • the grade vent valve assembly further includes a lever.
  • the lever includes a first end that is coupled to the float. The lever extends from the first end across the orifice to a second end. The lever pivots about a fulcrum between an open position and a sealing position. When in the open position, the lever allows fluid communication between the orifice and the inlet.
  • the lever When in the sealing position, the lever blocks fluid communication between the orifice and the inlet.
  • the lever moves between the open position and the sealing position in response to movement of the float between the lowered position and the raised position.
  • the lever is disposed in the sealing position when the float is disposed in the raised position, and is disposed in the open position when the float is disposed in the lowered position.
  • a roll-over vent valve assembly for a fuel tank of a vehicle is also provided.
  • the roll-over vent valve assembly includes a housing.
  • the housing defines a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber.
  • a float is disposed within the float chamber. The float is moveable between a lowered position and a raised position.
  • a biasing device is disposed within the float chamber between the housing and the float. The biasing device is configured for biasing the float into the raised position.
  • the roll-over vent valve assembly further includes a lever.
  • the lever includes a first end pivotably coupled to the float. The lever extends from the first end across the orifice to a second end.
  • the lever pivots about a fulcrum between an open position and a sealing position.
  • the lever When in the open position, the lever allows fluid communication between the orifice and the inlet.
  • the lever When in the sealing position, the lever blocks fluid communication between the orifice and the inlet.
  • the lever moves between the open position and the sealing position in response to movement of the float between the lowered position and the raised position.
  • the lever is disposed in the sealing position when the float is disposed in the raised position, and is disposed in the open position when the float is disposed in the lowered position.
  • a sealing member is attached to the lever adjacent the second end of the lever.
  • the sealing member is moveable with the lever.
  • the sealing member includes a synthetic rubber material and is configured for sealing against an interior surface of the liquid sealing chamber to seal the orifice.
  • a locating mechanism interconnects the sealing member and the housing. The locating mechanism is configured for positioning the sealing member relative to the orifice.
  • a cover is attached to and in sealing engagement with
  • the leverage created by rotating the lever about the fulcrum, which is disposed between the first end of the lever and the second end of the lever, increases the force applied to break the seal between the sealing member and the interior surface of the liquid sealing chamber, thereby improving the re-opening characteristics of the vent valve assembly.
  • FIG. 1 is a schematic exploded view of a grade vent valve assembly.
  • FIG. 2 is a schematic cross sectional view of the grade vent valve assembly showing a float in a lowered position and a lever in an open position.
  • FIG. 3 is a schematic cross sectional view of the grade vent valve assembly showing the float in a raised position and the lever in a sealing position.
  • FIG. 4 is a schematic cross sectional view of the grade vent valve assembly showing a pressure relief mechanism.
  • FIG. 5 is a schematic perspective view of the grade vent valve assembly.
  • a grade vent valve assembly is generally shown at 20 .
  • the grade vent valve assembly 20 may also be referred to as a roll-over vent valve assembly 20 .
  • the grade vent valve assembly 20 is positioned at a top wall 22 of a fuel tank 24 of a vehicle.
  • the grade vent valve assembly 20 includes a pressure relief mechanism 26 , described in greater detail below, which allows fuel vapors to escape from the fuel tank 24 during normal operating condition.
  • the grade vent valve assembly 20 is configured to block fluid flow from the tank, thereby preventing fuel leakage from the tank.
  • the grade vent valve assembly 20 includes a housing 28 .
  • the housing 28 may include and be formed from, but is not limited to an acetal material, or some other similar material.
  • the housing 28 defines a float chamber 30 , and an inlet 32 open to the float chamber 30 .
  • the inlet 32 is disposed within the fuel tank 24 adjacent the top wall 22 of the fuel tank 24 such that fuel vapors that rise to the top of the fuel tank 24 may flow through the inlet 32 of the housing 28 and into the float chamber 30 .
  • the housing 28 further defines a liquid sealing chamber 34 , and an orifice 36 open to the liquid sealing chamber 34 .
  • the orifice is shown in the Figures having a circular shape.
  • the orifice 36 may include any suitable shape.
  • the liquid sealing chamber 34 is in fluid communication with the float chamber 30 . Accordingly, fuel vapors passing through the inlet 32 of the housing 28 , may pass through the float chamber 30 , around a float 42 and into the liquid sealing chamber 34 , and exit the liquid sealing chamber 34 through the orifice 36 .
  • the orifice 36 is in fluid communication with the pressure relief mechanism 26 . Under normal operating conditions, the vapors passing through the orifice 36 exit the grade vent valve assembly 20 through the pressure relief mechanism 26 when the fuel vapors reach a pre-determined pressure.
  • the grade vent valve assembly 20 includes a cover 38 .
  • the cover 38 is attached to and in sealing engagement with the housing 28 .
  • the cover 38 may be attached to the housing 28 in any suitable manner, including but not limited to attaching the cover 38 to the housing 28 with detents 40 and/or fasteners.
  • the cover 38 may include and be manufactured from, but is not limited to, HDPE or some other similar material.
  • the cover 38 cooperates with the housing 28 to further defining the float chamber 30 and the liquid sealing chamber 34 . More specifically, the cover 38 defines the top surface and/or region of the float chamber 30 and the liquid sealing chamber 34 .
  • the float 42 is disposed within the float chamber 30 .
  • the float 42 may include and be formed from, but is not limited to an acetal material, or some other similar material.
  • the float 42 is moveable between a lowered position, shown in FIG. 2 , and a raised position, shown in FIG. 3 . Under normal operating conditions, the float 42 remains in the lowered position. However, if the vehicle is disposed at an extreme angle, causing liquid fuel to enter the inlet 32 , then the buoyancy of the float 42 caused by any liquid fluid within the float chamber 30 causes the float 42 to rise to the raised position.
  • a biasing device 44 is disposed within the float chamber 30 .
  • the biasing device 44 is disposed between the housing 28 and the float 42 . More specifically, the biasing device 44 is disposed between a bottom wall 46 of the float chamber 30 and the float 42 .
  • the biasing device 44 is configured to bias the float 42 into the raised position. Accordingly, the biasing device 44 provides a biasing force acting to move the float 42 from the lowered position into the raised position. While the biasing force is not great enough to move the float 42 alone, the biasing device 44 cooperates with the buoyancy force generated by any liquid entering the float chamber 30 to move the float 42 into the raised position.
  • the biasing device 44 includes a coil spring manufactured from stainless steel.
  • the biasing device 44 may include a device other than the coils spring shown, and may be manufactured from some other material.
  • a lever 48 is disposed within the housing 28 , and spans across the float chamber 30 and the liquid sealing chamber 34 .
  • the lever 48 includes an elongated planar substrate, and may include and be manufactured from, but is not limited to an acetal material, or some other similar material.
  • a pivotable connection 50 interconnects the lever 48 and the housing 28 .
  • the pivotable connection 50 may be formed in any suitable manner capable of connecting the lever 48 to the housing 28 and cause the lever 48 to rotate about a rotation axis 52 .
  • the lever 48 includes two perpendicularly extending pins 54 that are rotatably supported by a pair of supports 56 disposed on opposite longitudinal sides of the lever 48 . The interaction between the pins 54 and the supports 56 define the pivotable connection 50 .
  • the pivotable connection 50 may be positioned relative to the lever 48 other than shown and described herein, i.e., below or level with the lever 48 .
  • the pivotable connection 50 defines a fulcrum about which the lever 48 rotates. Accordingly, the fulcrum defines the rotation axis 52 .
  • the lever 48 includes a first end 58 that is pivotably coupled to the float 42 .
  • the first end 58 of the float 42 moves vertically with the float 42 as the float 42 moves between the lowered position and the raised position.
  • the first end 58 of the lever 48 may be pivotably coupled to the float 42 in any manner capable of allowing rotation of the lever 48 about the rotation axis 52 , while securing the first end 58 of the lever 48 relative to the float 42 for vertical movement therewith.
  • the lever 48 extends from the first end 58 to a second end 60 disposed across the orifice 36 from the first end 58 .
  • the lever 48 pivots or rotates about the fulcrum, which is disposed between the first end 58 of the lever 48 and the second end 60 of the lever 48 .
  • the lever 48 pivots between an open position, shown in FIG. 2 , and a sealing position, shown in FIG. 3 .
  • the lever 48 allows fluid communication between the orifice 36 and the inlet 32 , thereby allowing vapors to flow from the fuel tank 24 to the pressure relief mechanism 26 .
  • the lever 48 blocks fluid communication between the orifice 36 and the inlet 32 .
  • the lever 48 pivots between the open position and the sealing position in response to the movement of the float 42 between the lowered position and the raised position.
  • the lever 48 is disposed in the sealing position when the float 42 is disposed in the raised position, and the lever 48 is disposed in the open position when the float 42 is disposed in the lowered position.
  • the first end 58 of the lever 48 is coupled to the float 42 at a first force application location 62 .
  • a center of the orifice 36 is positioned relative to the lever 48 at a second force application location 64 .
  • the lever 48 defines a length 66 between the first force application location 62 and the second force application location 64 .
  • the fulcrum is disposed a first distance 68 from the first force application location 62 and a second distance 70 from the second force application location 64 .
  • the first distance 68 is preferably at least equal to or greater than ten percent (10%) of the length 66 of the lever 48
  • the second distance 70 is preferably also at least equal to or greater than ten percent (10%) of the length 66 of the lever 48 .
  • the fulcrum is disposed at an approximate midsection of the lever 48 , with the first distance 68 approximately equal to the second distance 70 .
  • a sealing member 72 may be attached to the lever 48 adjacent the second end 60 of the lever 48 .
  • the sealing member 72 may be moveable with the lever 48 .
  • the sealing member 72 is configured for sealing against an interior surface 74 of the liquid sealing chamber 34 about a periphery of the orifice 36 to seal the orifice 36 .
  • the sealing member 72 is brought into contact with the interior surface 74 when the lever 48 is moved into the sealing position. Accordingly, liquid entering the float chamber 30 , which is shown in FIG. 3 , moves the float 42 from the lowered position into the raised position, thereby moving the lever 48 from the open position into the sealing position. As the liquid drains from the float chamber 30 , such as shown in FIG.
  • the float 42 returns back to the lowered position, thereby moving the lever 48 back to the open position and breaking the seal between the sealing member 72 and the interior surface 74 of the liquid sealing chamber 34 , thereby allowing vapors to flow to the pressure relief mechanism 26 again.
  • the sealing member 72 includes a ribbon 76 disposed between the lever 48 and the interior surface 74 of the liquid sealing chamber 34 .
  • the ribbon 76 includes a width 78 that is greater than a width 80 of the orifice 36 .
  • the sealing member 72 may be secured about a periphery of the orifice 36 , with the lever 48 moving into sealing engagement with the sealing member 72 when the lever moves into the closed position.
  • the sealing member 72 may include and be manufactured from, but is not limited to a pliable material.
  • the pliable material may include but is not limited to a synthetic rubber material, such as viton.
  • a locating mechanism 82 interconnects the sealing member 72 and the housing 28 .
  • the locating mechanism 82 is configured to position the sealing member 72 relative to the orifice 36 .
  • the locating mechanism 82 includes a pair of posts 84 extending upward from the interior surface 74 of the liquid sealing chamber 34 , that extend through a pair of cutouts 86 in the sealing member 72 to align the sealing member 72 .
  • the sealing member 72 is positionally located relative to the lever 48 .
  • the sealing member 72 is further attached to the second end 60 of the lever 48 so as to move with the second end 60 of the lever 48 . It should be appreciated that the sealing member 72 may be shaped, sized and/or configured in some other manner than shown and described herein that is capable of moving with the lever 48 to seal the orifice 36 when the lever 48 is in the sealing position.
  • the housing 28 and the cover 38 further cooperate to define a pressure chamber 88 .
  • the pressure chamber 88 is in fluid communication with the orifice 36 to receive vapor therefrom.
  • the pressure relief mechanism 26 is disposed within the pressure chamber 88 in fluid communication with the orifice 36 .
  • the pressure relief mechanism 26 is configured for venting pressurized vapors therethrough.
  • the pressure relief mechanism 26 includes a stainless steel ball 90 seated on a concave opening 92 defined by the housing 28 .
  • the concave opening 92 is in fluid communication with the orifice 36 .
  • the pressure relief mechanism 26 may be configured and operate in some other manner not shown or described herein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Float Valves (AREA)

Abstract

A grade vent valve assembly includes a float moveable between a lowered position and a raised position. A lever is coupled to the float at a first end of the lever. The lever pivots about a fulcrum spaced from the first end in response to movement of the float between the raised position and the lowered position. The lever pivots between an open position when the float is in the lowered position, and a sealing position when the float is in the raised position. The lever seals an orifice when in the sealing position to block fluid flow through the orifice.

Description

    TECHNICAL FIELD
  • The invention generally relates to a grade vent valve assembly, sometimes referred to as a roll-over vent valve assembly.
  • BACKGROUND
  • Vehicular fuel systems include a fuel tank having a grade vent valve assembly. The grade vent vale assembly opens fluid communication between the fuel tank and other components of the fuel system to allow pressurized fuel vapor to escape the fuel tank under normal conditions, and closes fluid communication between the fuel tank and the other components of the fuel system to prevent liquid fuel from flowing out of the fuel tank when the vehicle is at an extreme angle or in an inverted position, i.e., in a rolled-over position.
  • SUMMARY
  • A grade vent valve assembly for a fuel tank of a vehicle is provided. The grade vent valve assembly includes a housing. The housing defines a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber. A float is disposed within the float chamber. The float is moveable between a lowered position and a raised position. The grade vent valve assembly further includes a lever. The lever includes a first end that is coupled to the float. The lever extends from the first end across the orifice to a second end. The lever pivots about a fulcrum between an open position and a sealing position. When in the open position, the lever allows fluid communication between the orifice and the inlet. When in the sealing position, the lever blocks fluid communication between the orifice and the inlet. The lever moves between the open position and the sealing position in response to movement of the float between the lowered position and the raised position. The lever is disposed in the sealing position when the float is disposed in the raised position, and is disposed in the open position when the float is disposed in the lowered position.
  • A roll-over vent valve assembly for a fuel tank of a vehicle is also provided. The roll-over vent valve assembly includes a housing. The housing defines a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber. A float is disposed within the float chamber. The float is moveable between a lowered position and a raised position. A biasing device is disposed within the float chamber between the housing and the float. The biasing device is configured for biasing the float into the raised position. The roll-over vent valve assembly further includes a lever. The lever includes a first end pivotably coupled to the float. The lever extends from the first end across the orifice to a second end. The lever pivots about a fulcrum between an open position and a sealing position. When in the open position, the lever allows fluid communication between the orifice and the inlet. When in the sealing position, the lever blocks fluid communication between the orifice and the inlet. The lever moves between the open position and the sealing position in response to movement of the float between the lowered position and the raised position. The lever is disposed in the sealing position when the float is disposed in the raised position, and is disposed in the open position when the float is disposed in the lowered position. A sealing member is attached to the lever adjacent the second end of the lever. The sealing member is moveable with the lever. The sealing member includes a synthetic rubber material and is configured for sealing against an interior surface of the liquid sealing chamber to seal the orifice. A locating mechanism interconnects the sealing member and the housing. The locating mechanism is configured for positioning the sealing member relative to the orifice. A cover is attached to and in sealing engagement with the housing. The cover further defines the float chamber and the liquid sealing chamber.
  • Accordingly, the leverage created by rotating the lever about the fulcrum, which is disposed between the first end of the lever and the second end of the lever, increases the force applied to break the seal between the sealing member and the interior surface of the liquid sealing chamber, thereby improving the re-opening characteristics of the vent valve assembly.
  • The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic exploded view of a grade vent valve assembly.
  • FIG. 2 is a schematic cross sectional view of the grade vent valve assembly showing a float in a lowered position and a lever in an open position.
  • FIG. 3 is a schematic cross sectional view of the grade vent valve assembly showing the float in a raised position and the lever in a sealing position.
  • FIG. 4 is a schematic cross sectional view of the grade vent valve assembly showing a pressure relief mechanism.
  • FIG. 5 is a schematic perspective view of the grade vent valve assembly.
  • DETAILED DESCRIPTION
  • Those having ordinary skill in the art will recognize that terms such as “above,” “below,” “upward,” “downward,” “top,” “bottom,” etc., are used descriptively for the figures, and do not represent limitations on the scope of the invention, as defined by the appended claims.
  • Referring to the Figures, wherein like numerals indicate like parts throughout the several views, a grade vent valve assembly is generally shown at 20. The grade vent valve assembly 20 may also be referred to as a roll-over vent valve assembly 20. The grade vent valve assembly 20 is positioned at a top wall 22 of a fuel tank 24 of a vehicle. The grade vent valve assembly 20 includes a pressure relief mechanism 26, described in greater detail below, which allows fuel vapors to escape from the fuel tank 24 during normal operating condition. When the fuel tank 24 is oriented at an extreme angle or upside down, such as in the event of a vehicular roll-over, the grade vent valve assembly 20 is configured to block fluid flow from the tank, thereby preventing fuel leakage from the tank.
  • Referring to FIGS. 1 through 3, the grade vent valve assembly 20 includes a housing 28. The housing 28 may include and be formed from, but is not limited to an acetal material, or some other similar material. The housing 28 defines a float chamber 30, and an inlet 32 open to the float chamber 30. The inlet 32 is disposed within the fuel tank 24 adjacent the top wall 22 of the fuel tank 24 such that fuel vapors that rise to the top of the fuel tank 24 may flow through the inlet 32 of the housing 28 and into the float chamber 30. The housing 28 further defines a liquid sealing chamber 34, and an orifice 36 open to the liquid sealing chamber 34. The orifice is shown in the Figures having a circular shape. However, it should be appreciated that the orifice 36 may include any suitable shape. The liquid sealing chamber 34 is in fluid communication with the float chamber 30. Accordingly, fuel vapors passing through the inlet 32 of the housing 28, may pass through the float chamber 30, around a float 42 and into the liquid sealing chamber 34, and exit the liquid sealing chamber 34 through the orifice 36. The orifice 36 is in fluid communication with the pressure relief mechanism 26. Under normal operating conditions, the vapors passing through the orifice 36 exit the grade vent valve assembly 20 through the pressure relief mechanism 26 when the fuel vapors reach a pre-determined pressure.
  • The grade vent valve assembly 20 includes a cover 38. The cover 38 is attached to and in sealing engagement with the housing 28. The cover 38 may be attached to the housing 28 in any suitable manner, including but not limited to attaching the cover 38 to the housing 28 with detents 40 and/or fasteners. The cover 38 may include and be manufactured from, but is not limited to, HDPE or some other similar material. The cover 38 cooperates with the housing 28 to further defining the float chamber 30 and the liquid sealing chamber 34. More specifically, the cover 38 defines the top surface and/or region of the float chamber 30 and the liquid sealing chamber 34.
  • The float 42 is disposed within the float chamber 30. The float 42 may include and be formed from, but is not limited to an acetal material, or some other similar material. The float 42 is moveable between a lowered position, shown in FIG. 2, and a raised position, shown in FIG. 3. Under normal operating conditions, the float 42 remains in the lowered position. However, if the vehicle is disposed at an extreme angle, causing liquid fuel to enter the inlet 32, then the buoyancy of the float 42 caused by any liquid fluid within the float chamber 30 causes the float 42 to rise to the raised position.
  • A biasing device 44 is disposed within the float chamber 30. The biasing device 44 is disposed between the housing 28 and the float 42. More specifically, the biasing device 44 is disposed between a bottom wall 46 of the float chamber 30 and the float 42. The biasing device 44 is configured to bias the float 42 into the raised position. Accordingly, the biasing device 44 provides a biasing force acting to move the float 42 from the lowered position into the raised position. While the biasing force is not great enough to move the float 42 alone, the biasing device 44 cooperates with the buoyancy force generated by any liquid entering the float chamber 30 to move the float 42 into the raised position. Preferably, the biasing device 44 includes a coil spring manufactured from stainless steel. However, the biasing device 44 may include a device other than the coils spring shown, and may be manufactured from some other material.
  • A lever 48 is disposed within the housing 28, and spans across the float chamber 30 and the liquid sealing chamber 34. The lever 48 includes an elongated planar substrate, and may include and be manufactured from, but is not limited to an acetal material, or some other similar material. A pivotable connection 50 interconnects the lever 48 and the housing 28. The pivotable connection 50 may be formed in any suitable manner capable of connecting the lever 48 to the housing 28 and cause the lever 48 to rotate about a rotation axis 52. As shown, the lever 48 includes two perpendicularly extending pins 54 that are rotatably supported by a pair of supports 56 disposed on opposite longitudinal sides of the lever 48. The interaction between the pins 54 and the supports 56 define the pivotable connection 50. The pivotable connection 50 may be positioned relative to the lever 48 other than shown and described herein, i.e., below or level with the lever 48. The pivotable connection 50 defines a fulcrum about which the lever 48 rotates. Accordingly, the fulcrum defines the rotation axis 52.
  • The lever 48 includes a first end 58 that is pivotably coupled to the float 42. The first end 58 of the float 42 moves vertically with the float 42 as the float 42 moves between the lowered position and the raised position. The first end 58 of the lever 48 may be pivotably coupled to the float 42 in any manner capable of allowing rotation of the lever 48 about the rotation axis 52, while securing the first end 58 of the lever 48 relative to the float 42 for vertical movement therewith.
  • The lever 48 extends from the first end 58 to a second end 60 disposed across the orifice 36 from the first end 58. The lever 48 pivots or rotates about the fulcrum, which is disposed between the first end 58 of the lever 48 and the second end 60 of the lever 48. The lever 48 pivots between an open position, shown in FIG. 2, and a sealing position, shown in FIG. 3. When in the open position, the lever 48 allows fluid communication between the orifice 36 and the inlet 32, thereby allowing vapors to flow from the fuel tank 24 to the pressure relief mechanism 26. When in the sealing position, the lever 48 blocks fluid communication between the orifice 36 and the inlet 32. The lever 48 pivots between the open position and the sealing position in response to the movement of the float 42 between the lowered position and the raised position. The lever 48 is disposed in the sealing position when the float 42 is disposed in the raised position, and the lever 48 is disposed in the open position when the float 42 is disposed in the lowered position.
  • The first end 58 of the lever 48 is coupled to the float 42 at a first force application location 62. A center of the orifice 36 is positioned relative to the lever 48 at a second force application location 64. The lever 48 defines a length 66 between the first force application location 62 and the second force application location 64. The fulcrum is disposed a first distance 68 from the first force application location 62 and a second distance 70 from the second force application location 64. The first distance 68 is preferably at least equal to or greater than ten percent (10%) of the length 66 of the lever 48, and the second distance 70 is preferably also at least equal to or greater than ten percent (10%) of the length 66 of the lever 48. Preferably, the fulcrum is disposed at an approximate midsection of the lever 48, with the first distance 68 approximately equal to the second distance 70.
  • A sealing member 72 may be attached to the lever 48 adjacent the second end 60 of the lever 48. The sealing member 72 may be moveable with the lever 48. As shown, the sealing member 72 is configured for sealing against an interior surface 74 of the liquid sealing chamber 34 about a periphery of the orifice 36 to seal the orifice 36. The sealing member 72 is brought into contact with the interior surface 74 when the lever 48 is moved into the sealing position. Accordingly, liquid entering the float chamber 30, which is shown in FIG. 3, moves the float 42 from the lowered position into the raised position, thereby moving the lever 48 from the open position into the sealing position. As the liquid drains from the float chamber 30, such as shown in FIG. 2, the float 42 returns back to the lowered position, thereby moving the lever 48 back to the open position and breaking the seal between the sealing member 72 and the interior surface 74 of the liquid sealing chamber 34, thereby allowing vapors to flow to the pressure relief mechanism 26 again.
  • As shown, the sealing member 72 includes a ribbon 76 disposed between the lever 48 and the interior surface 74 of the liquid sealing chamber 34. Referring to FIG. 4, the ribbon 76 includes a width 78 that is greater than a width 80 of the orifice 36. Alternatively, the sealing member 72 may be secured about a periphery of the orifice 36, with the lever 48 moving into sealing engagement with the sealing member 72 when the lever moves into the closed position. The sealing member 72 may include and be manufactured from, but is not limited to a pliable material. The pliable material may include but is not limited to a synthetic rubber material, such as viton.
  • Referring to FIGS. 1 and 5, a locating mechanism 82 interconnects the sealing member 72 and the housing 28. The locating mechanism 82 is configured to position the sealing member 72 relative to the orifice 36. As shown, the locating mechanism 82 includes a pair of posts 84 extending upward from the interior surface 74 of the liquid sealing chamber 34, that extend through a pair of cutouts 86 in the sealing member 72 to align the sealing member 72. When disposed between the lever 48 and the interior surface 74 of the liquid sealing chamber 34, with the posts 84 extending through the cutouts 86 of the sealing member 72, the sealing member 72 is positionally located relative to the lever 48. The sealing member 72 is further attached to the second end 60 of the lever 48 so as to move with the second end 60 of the lever 48. It should be appreciated that the sealing member 72 may be shaped, sized and/or configured in some other manner than shown and described herein that is capable of moving with the lever 48 to seal the orifice 36 when the lever 48 is in the sealing position.
  • Referring to FIGS. 1 and 4, the housing 28 and the cover 38 further cooperate to define a pressure chamber 88. The pressure chamber 88 is in fluid communication with the orifice 36 to receive vapor therefrom. The pressure relief mechanism 26 is disposed within the pressure chamber 88 in fluid communication with the orifice 36. As noted above, the pressure relief mechanism 26 is configured for venting pressurized vapors therethrough. As best shown in FIG. 4, the pressure relief mechanism 26 includes a stainless steel ball 90 seated on a concave opening 92 defined by the housing 28. The concave opening 92 is in fluid communication with the orifice 36. When the pressure of the vapor reaches the pre-defined pressure, the vapor pressure lifts the ball vertically upward, thereby allowing the vapors to pass around an outer periphery of the ball and exit the grade vent valve assembly 20. As shown in FIG. 4, when the vapor pressure is below the pre-defined pressure, the weight of the stainless steel ball 90 positions the stainless seal ball on the concave opening 92 to seal the concave opening 92 and block fluid and/or vapor flow through the concave opening 92. It should be appreciated that the pressure relief mechanism 26 may be configured and operate in some other manner not shown or described herein.
  • While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.

Claims (20)

1. A grade vent valve assembly for a fuel tank of a vehicle, the grade vent valve assembly comprising:
a housing defining a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber;
a float disposed within the float chamber and moveable between a lowered position and a raised position; and
a lever having a first end coupled to the float and extending across the orifice to a second end, wherein the lever pivots about a fulcrum between an open position allowing fluid communication between the orifice and the inlet and a sealing position blocking fluid communication between the orifice and the inlet in response to movement of the float between the lowered position and the raised position;
wherein the lever is disposed in the sealing position when the float is disposed in the raised position, and the lever is disposed in the open position when the float is disposed in the lowered position.
2. A grade vent valve assembly as set forth in claim 1 further comprising a biasing device disposed within the float chamber between the housing and the float and configured for biasing the float into the raised position.
3. A grade vent valve assembly as set forth in claim 1 wherein the fulcrum is disposed at an approximate midsection of the lever.
4. A grade vent valve assembly as set forth in claim 1 wherein the first end of the lever is coupled to the float at a first force application location and the orifice is positioned relative to the lever at a second force application location, and wherein the fulcrum is disposed a first distance from the first force application location and a second distance from the second force application location.
5. A grade vent valve assembly as set forth in claim 4 wherein the lever defines a length between the first force application location and the second force application location, and wherein the first distance is at least equal to or greater than ten percent (10%) of the length.
6. A grade vent valve assembly as set forth in claim 4 wherein the lever defines a length between the first force application location and the second force application location, and wherein the second distance is at least equal to or greater than ten percent (10%) of the length.
7. A grade vent valve assembly as set forth in claim 1 further comprising a sealing member attached to the lever adjacent the second end of the lever and moveable with the lever, wherein the sealing member is configured for sealing against an interior surface of the liquid sealing chamber to seal the orifice.
8. A grade vent valve assembly as set forth in claim 7 wherein the sealing member includes a ribbon disposed between the lever and the interior surface of the liquid sealing chamber and including a width greater than a width of the orifice.
9. A grade vent valve assembly as set forth in claim 7 wherein the sealing member includes and is manufactured from a pliable material.
10. A grade vent valve assembly as set forth in claim 9 wherein the pliable material includes a synthetic rubber material.
11. A grade vent valve assembly as set forth in claim 7 further comprising a locating mechanism interconnecting the sealing member and the housing and configured to position the sealing member relative to the orifice.
12. A grade vent valve assembly as set forth in claim 1 further comprising a pivotable connection interconnecting the lever and the housing and defining the fulcrum.
13. A grade vent valve assembly as set forth in claim 1 wherein the first end of the lever is pivotably connected to the float.
14. A grade vent valve assembly as set forth in claim 1 further comprising a pressure relief mechanism in fluid communication with the orifice and configured for venting pressurized vapors therethrough.
15. A grade vent valve assembly as set forth in claim 1 further comprising a cover attached to and in sealing engagement with the housing and further defining the float chamber and the liquid sealing chamber.
16. A roll-over vent valve assembly for a fuel tank of a vehicle, the roll-over vent valve assembly comprising:
a housing defining a float chamber, an inlet open to the float chamber, a liquid sealing chamber in fluid communication with the float chamber, and an orifice open to the liquid sealing chamber;
a float disposed within the float chamber and moveable between a lowered position and a raised position;
a biasing device disposed within the float chamber between the housing and the float and configured for biasing the float into the raised position
a lever having a first end pivotably coupled to the float and extending across the orifice to a second end, wherein the lever pivots about a fulcrum between an open position allowing fluid communication between the orifice and the inlet and a sealing position blocking fluid communication between the orifice and the inlet in response to movement of the float between the lowered position and the raised position;
wherein the lever is disposed in the sealing position when the float is disposed in the raised position, and the lever is disposed in the open position when the float is disposed in the lowered position;
a sealing member attached to the lever adjacent the second end of the lever and moveable with the lever, wherein the sealing member includes a synthetic rubber material and is configured for sealing against an interior surface of the liquid sealing chamber to seal the orifice;
a locating mechanism interconnecting the sealing member and the housing and configured to position the sealing member relative to the orifice;
a cover attached to and in sealing engagement with the housing and further defining the float chamber and the liquid sealing chamber.
17. A roll-over vent valve assembly as set forth in claim 16 wherein the first end of the lever is coupled to the float at a first force application location and a center of the orifice is positioned relative to the lever at a second force application location, wherein the fulcrum is disposed a first distance from the first force application location and a second distance from the second force application location, wherein the lever defines a length between the first force application location and the second force application location, and wherein the first distance is at least equal to or greater than ten percent (10%) of the length, and the second distance is at least equal to or greater than ten percent (10%) of the length.
18. A roll-over vent valve assembly as set forth in claim 16 wherein the fulcrum is disposed at an approximate midsection of the lever.
19. A roll-over vent valve assembly as set forth in claim 16 further comprising a pivotable connection interconnecting the lever and the housing and defining the fulcrum.
20. A roll-over vent valve assembly 20 as set forth in claim 16 further comprising a pressure relief mechanism 26 in fluid communication with the orifice 36 and configured for venting pressurized vapors therethrough.
US13/163,926 2011-06-20 2011-06-20 Lever based grade vent valve Abandoned US20120318794A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US13/163,926 US20120318794A1 (en) 2011-06-20 2011-06-20 Lever based grade vent valve
BR112013029427A BR112013029427A2 (en) 2011-06-20 2012-06-18 tilt vent valve assembly
KR1020137034302A KR20140034858A (en) 2011-06-20 2012-06-18 Lever based grade vent valve
JP2014516450A JP2014525005A (en) 2011-06-20 2012-06-18 Lever type inclined vent valve
AU2012273695A AU2012273695A1 (en) 2011-06-20 2012-06-18 Lever based grade vent valve
EP12750803.4A EP2720896A2 (en) 2011-06-20 2012-06-18 Lever based grade vent valve
PCT/IB2012/001189 WO2012176036A2 (en) 2011-06-20 2012-06-18 Lever based grade vent valve
CN2012102755295A CN102865403A (en) 2011-06-20 2012-06-20 Lever based grade vent valve
CN201220383901XU CN203051873U (en) 2011-06-20 2012-06-20 Grading vent valve component

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/163,926 US20120318794A1 (en) 2011-06-20 2011-06-20 Lever based grade vent valve

Publications (1)

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US20120318794A1 true US20120318794A1 (en) 2012-12-20

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ID=46727258

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US13/163,926 Abandoned US20120318794A1 (en) 2011-06-20 2011-06-20 Lever based grade vent valve

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Country Link
US (1) US20120318794A1 (en)
EP (1) EP2720896A2 (en)
JP (1) JP2014525005A (en)
KR (1) KR20140034858A (en)
CN (2) CN203051873U (en)
AU (1) AU2012273695A1 (en)
BR (1) BR112013029427A2 (en)
WO (1) WO2012176036A2 (en)

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WO2015164861A1 (en) * 2014-04-25 2015-10-29 Eaton Corporation Fuel tank isolation valve having controlled venting feature
CN106195415A (en) * 2016-08-26 2016-12-07 天津市国威给排水设备制造有限公司 A kind of ball-cock assembly
WO2017005780A1 (en) * 2015-07-09 2017-01-12 Kautex Textron Gmbh & Co. Kg Frost-resistant operating-liquid container having movable components
US10369882B2 (en) * 2014-08-25 2019-08-06 Piolax, Inc. Valve case mounting structure
US10683946B2 (en) 2017-01-31 2020-06-16 Plast-O-Matic Valves, Inc. Combination air release, degassing and vacuum relief valve
WO2021001619A1 (en) 2019-07-01 2021-01-07 Desplats Etienne Automatic air drainer

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CN105952939B (en) * 2016-07-01 2018-05-11 泉州市沪航阀门制造有限公司 A kind of modified double containment air bleeding valve
CN111609197B (en) * 2020-04-27 2022-02-18 铜陵兴荣阀门管件有限公司 Combined type exhaust valve

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WO2015164861A1 (en) * 2014-04-25 2015-10-29 Eaton Corporation Fuel tank isolation valve having controlled venting feature
US10369882B2 (en) * 2014-08-25 2019-08-06 Piolax, Inc. Valve case mounting structure
WO2017005780A1 (en) * 2015-07-09 2017-01-12 Kautex Textron Gmbh & Co. Kg Frost-resistant operating-liquid container having movable components
CN106195415A (en) * 2016-08-26 2016-12-07 天津市国威给排水设备制造有限公司 A kind of ball-cock assembly
US10683946B2 (en) 2017-01-31 2020-06-16 Plast-O-Matic Valves, Inc. Combination air release, degassing and vacuum relief valve
WO2021001619A1 (en) 2019-07-01 2021-01-07 Desplats Etienne Automatic air drainer
FR3098270A1 (en) * 2019-07-01 2021-01-08 Etienne DESPLATS AUTOMATIC AIR DRAINER

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EP2720896A2 (en) 2014-04-23
AU2012273695A1 (en) 2014-01-16
KR20140034858A (en) 2014-03-20
JP2014525005A (en) 2014-09-25
CN102865403A (en) 2013-01-09
BR112013029427A2 (en) 2017-01-31
WO2012176036A2 (en) 2012-12-27
WO2012176036A3 (en) 2013-06-27
CN203051873U (en) 2013-07-10

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