US20120318794A1 - Lever based grade vent valve - Google Patents
Lever based grade vent valve Download PDFInfo
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
- F16K24/042—Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float
- F16K24/048—Devices, 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K15/03519—Valve arrangements in the vent line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03256—Fuel tanks characterised by special valves, the mounting thereof
- B60K2015/03289—Float valves; Floats therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
- B60K2015/03388—Arrangements or special measures related to fuel tanks or fuel handling in case of a roll over of the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT 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
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
- B60K2015/0358—Fuel tanks characterised by venting means the venting is actuated by specific signals or positions of particular parts
- B60K2015/03585—Fuel 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
- 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. 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.
-
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. - 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-overvent valve assembly 20. The gradevent valve assembly 20 is positioned at a top wall 22 of afuel tank 24 of a vehicle. The gradevent valve assembly 20 includes apressure relief mechanism 26, described in greater detail below, which allows fuel vapors to escape from thefuel tank 24 during normal operating condition. When thefuel tank 24 is oriented at an extreme angle or upside down, such as in the event of a vehicular roll-over, the gradevent 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 gradevent valve assembly 20 includes ahousing 28. Thehousing 28 may include and be formed from, but is not limited to an acetal material, or some other similar material. Thehousing 28 defines afloat chamber 30, and aninlet 32 open to thefloat chamber 30. Theinlet 32 is disposed within thefuel tank 24 adjacent the top wall 22 of thefuel tank 24 such that fuel vapors that rise to the top of thefuel tank 24 may flow through theinlet 32 of thehousing 28 and into thefloat chamber 30. Thehousing 28 further defines aliquid sealing chamber 34, and anorifice 36 open to theliquid sealing chamber 34. The orifice is shown in the Figures having a circular shape. However, it should be appreciated that theorifice 36 may include any suitable shape. Theliquid sealing chamber 34 is in fluid communication with thefloat chamber 30. Accordingly, fuel vapors passing through theinlet 32 of thehousing 28, may pass through thefloat chamber 30, around afloat 42 and into theliquid sealing chamber 34, and exit theliquid sealing chamber 34 through theorifice 36. Theorifice 36 is in fluid communication with thepressure relief mechanism 26. Under normal operating conditions, the vapors passing through theorifice 36 exit the gradevent valve assembly 20 through thepressure relief mechanism 26 when the fuel vapors reach a pre-determined pressure. - The grade
vent valve assembly 20 includes acover 38. Thecover 38 is attached to and in sealing engagement with thehousing 28. Thecover 38 may be attached to thehousing 28 in any suitable manner, including but not limited to attaching thecover 38 to thehousing 28 withdetents 40 and/or fasteners. Thecover 38 may include and be manufactured from, but is not limited to, HDPE or some other similar material. Thecover 38 cooperates with thehousing 28 to further defining thefloat chamber 30 and theliquid sealing chamber 34. More specifically, thecover 38 defines the top surface and/or region of thefloat chamber 30 and theliquid sealing chamber 34. - The
float 42 is disposed within thefloat chamber 30. Thefloat 42 may include and be formed from, but is not limited to an acetal material, or some other similar material. Thefloat 42 is moveable between a lowered position, shown inFIG. 2 , and a raised position, shown inFIG. 3 . Under normal operating conditions, thefloat 42 remains in the lowered position. However, if the vehicle is disposed at an extreme angle, causing liquid fuel to enter theinlet 32, then the buoyancy of thefloat 42 caused by any liquid fluid within thefloat chamber 30 causes thefloat 42 to rise to the raised position. - A biasing
device 44 is disposed within thefloat chamber 30. The biasingdevice 44 is disposed between thehousing 28 and thefloat 42. More specifically, the biasingdevice 44 is disposed between abottom wall 46 of thefloat chamber 30 and thefloat 42. The biasingdevice 44 is configured to bias thefloat 42 into the raised position. Accordingly, the biasingdevice 44 provides a biasing force acting to move thefloat 42 from the lowered position into the raised position. While the biasing force is not great enough to move thefloat 42 alone, the biasingdevice 44 cooperates with the buoyancy force generated by any liquid entering thefloat chamber 30 to move thefloat 42 into the raised position. Preferably, the biasingdevice 44 includes a coil spring manufactured from stainless steel. However, the biasingdevice 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 thehousing 28, and spans across thefloat chamber 30 and theliquid sealing chamber 34. Thelever 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. Apivotable connection 50 interconnects thelever 48 and thehousing 28. Thepivotable connection 50 may be formed in any suitable manner capable of connecting thelever 48 to thehousing 28 and cause thelever 48 to rotate about arotation axis 52. As shown, thelever 48 includes two perpendicularly extendingpins 54 that are rotatably supported by a pair ofsupports 56 disposed on opposite longitudinal sides of thelever 48. The interaction between thepins 54 and thesupports 56 define thepivotable connection 50. Thepivotable connection 50 may be positioned relative to thelever 48 other than shown and described herein, i.e., below or level with thelever 48. Thepivotable connection 50 defines a fulcrum about which thelever 48 rotates. Accordingly, the fulcrum defines therotation axis 52. - The
lever 48 includes afirst end 58 that is pivotably coupled to thefloat 42. Thefirst end 58 of thefloat 42 moves vertically with thefloat 42 as thefloat 42 moves between the lowered position and the raised position. Thefirst end 58 of thelever 48 may be pivotably coupled to thefloat 42 in any manner capable of allowing rotation of thelever 48 about therotation axis 52, while securing thefirst end 58 of thelever 48 relative to thefloat 42 for vertical movement therewith. - The
lever 48 extends from thefirst end 58 to asecond end 60 disposed across theorifice 36 from thefirst end 58. Thelever 48 pivots or rotates about the fulcrum, which is disposed between thefirst end 58 of thelever 48 and thesecond end 60 of thelever 48. Thelever 48 pivots between an open position, shown inFIG. 2 , and a sealing position, shown inFIG. 3 . When in the open position, thelever 48 allows fluid communication between theorifice 36 and theinlet 32, thereby allowing vapors to flow from thefuel tank 24 to thepressure relief mechanism 26. When in the sealing position, thelever 48 blocks fluid communication between theorifice 36 and theinlet 32. Thelever 48 pivots between the open position and the sealing position in response to the movement of thefloat 42 between the lowered position and the raised position. Thelever 48 is disposed in the sealing position when thefloat 42 is disposed in the raised position, and thelever 48 is disposed in the open position when thefloat 42 is disposed in the lowered position. - The
first end 58 of thelever 48 is coupled to thefloat 42 at a firstforce application location 62. A center of theorifice 36 is positioned relative to thelever 48 at a secondforce application location 64. Thelever 48 defines a length 66 between the firstforce application location 62 and the secondforce application location 64. The fulcrum is disposed a first distance 68 from the firstforce application location 62 and asecond distance 70 from the secondforce application location 64. The first distance 68 is preferably at least equal to or greater than ten percent (10%) of the length 66 of thelever 48, and thesecond distance 70 is preferably also at least equal to or greater than ten percent (10%) of the length 66 of thelever 48. Preferably, the fulcrum is disposed at an approximate midsection of thelever 48, with the first distance 68 approximately equal to thesecond distance 70. - A sealing
member 72 may be attached to thelever 48 adjacent thesecond end 60 of thelever 48. The sealingmember 72 may be moveable with thelever 48. As shown, the sealingmember 72 is configured for sealing against aninterior surface 74 of theliquid sealing chamber 34 about a periphery of theorifice 36 to seal theorifice 36. The sealingmember 72 is brought into contact with theinterior surface 74 when thelever 48 is moved into the sealing position. Accordingly, liquid entering thefloat chamber 30, which is shown inFIG. 3 , moves thefloat 42 from the lowered position into the raised position, thereby moving thelever 48 from the open position into the sealing position. As the liquid drains from thefloat chamber 30, such as shown inFIG. 2 , thefloat 42 returns back to the lowered position, thereby moving thelever 48 back to the open position and breaking the seal between the sealingmember 72 and theinterior surface 74 of theliquid sealing chamber 34, thereby allowing vapors to flow to thepressure relief mechanism 26 again. - As shown, the sealing
member 72 includes aribbon 76 disposed between thelever 48 and theinterior surface 74 of theliquid sealing chamber 34. Referring toFIG. 4 , theribbon 76 includes awidth 78 that is greater than a width 80 of theorifice 36. Alternatively, the sealingmember 72 may be secured about a periphery of theorifice 36, with thelever 48 moving into sealing engagement with the sealingmember 72 when the lever moves into the closed position. The sealingmember 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 , alocating mechanism 82 interconnects the sealingmember 72 and thehousing 28. The locatingmechanism 82 is configured to position the sealingmember 72 relative to theorifice 36. As shown, the locatingmechanism 82 includes a pair ofposts 84 extending upward from theinterior surface 74 of theliquid sealing chamber 34, that extend through a pair ofcutouts 86 in the sealingmember 72 to align the sealingmember 72. When disposed between thelever 48 and theinterior surface 74 of theliquid sealing chamber 34, with theposts 84 extending through thecutouts 86 of the sealingmember 72, the sealingmember 72 is positionally located relative to thelever 48. The sealingmember 72 is further attached to thesecond end 60 of thelever 48 so as to move with thesecond end 60 of thelever 48. It should be appreciated that the sealingmember 72 may be shaped, sized and/or configured in some other manner than shown and described herein that is capable of moving with thelever 48 to seal theorifice 36 when thelever 48 is in the sealing position. - Referring to
FIGS. 1 and 4 , thehousing 28 and thecover 38 further cooperate to define apressure chamber 88. Thepressure chamber 88 is in fluid communication with theorifice 36 to receive vapor therefrom. Thepressure relief mechanism 26 is disposed within thepressure chamber 88 in fluid communication with theorifice 36. As noted above, thepressure relief mechanism 26 is configured for venting pressurized vapors therethrough. As best shown inFIG. 4 , thepressure relief mechanism 26 includes a stainless steel ball 90 seated on a concave opening 92 defined by thehousing 28. The concave opening 92 is in fluid communication with theorifice 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 gradevent valve assembly 20. As shown inFIG. 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 thepressure 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.
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)
Publication Number | Publication Date |
---|---|
US20120318794A1 true US20120318794A1 (en) | 2012-12-20 |
Family
ID=46727258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/163,926 Abandoned US20120318794A1 (en) | 2011-06-20 | 2011-06-20 | Lever based grade vent valve |
Country Status (8)
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) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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- 2012-06-18 KR KR1020137034302A patent/KR20140034858A/en not_active Application Discontinuation
- 2012-06-18 WO PCT/IB2012/001189 patent/WO2012176036A2/en active Application Filing
- 2012-06-18 EP EP12750803.4A patent/EP2720896A2/en not_active Withdrawn
- 2012-06-18 AU AU2012273695A patent/AU2012273695A1/en not_active Abandoned
- 2012-06-18 JP JP2014516450A patent/JP2014525005A/en active Pending
- 2012-06-20 CN CN201220383901XU patent/CN203051873U/en not_active Expired - Fee Related
- 2012-06-20 CN CN2012102755295A patent/CN102865403A/en active Pending
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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Also Published As
Publication number | Publication date |
---|---|
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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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |