Fuel tank valve assembly

Abstract

A valve assembly includes: a housing having an inner cavity; the floater assembly is arranged in the inner cavity; and an elongated film. The inner cavity is provided with an exhaust orifice in fluid communication with the exhaust outlet. The float assembly is movable along a longitudinal axis of the housing and includes an inclined platform disposed on an upper surface of the float assembly. The membrane includes a first end secured to the first attachment portion of the float assembly, a second end disposed opposite the first end and secured to the second attachment portion of the float assembly, and a relaxed portion associated with the second end.

Description

[0001] priority

[0002] This application claims the benefit under 35 U.S.C. §119(a) of Indian Patent Application No. 202311003998, filed on January 20, 2023, which is incorporated herein by reference. Technical Field

[0003] The field of the invention relates generally to fuel storage systems for vehicles, and more particularly to devices that can safely vent fuel vapors while preventing accidental leakage of liquid fuel. Background Art

[0004] Vehicle fuel tanks require systems and devices that allow for safe and stable operation under a variety of conditions. Given the high flammability and high energy density of fuel, the reliable performance of these safety systems is particularly important.

[0005] For example, a safety system is needed to ensure that vapors released from liquid fuel stored in a fuel tank are released safely rather than allowing pressure to build up within the fuel tank. For example, increases in ambient temperature and / or strong solar radiation may increase the temperature of the fuel tank and its contents, thereby increasing the rate at which fuel vapors form.

[0006] As another example, if a device or feature is provided for safely allowing liquid fuel vapor to escape from a fuel tank, additional safety features are needed to ensure that the vapor release path does not function as a liquid fuel release path, i.e., to prevent unintentional leakage. For example, if the fuel tank is overfilled during refueling, liquid fuel could leak through the path intended to release fuel vapors unless this risk is anticipated and mitigated.

[0007] As another example, if the fuel vapor release passage is sealed to prevent leakage upon an overfill event, the design of the safety features described above may need to ensure that full functionality of the safety system (such as the fuel vapor release) is quickly restored when the fuel level subsequently decreases or when normal operating conditions are restored. Summary of the Invention

[0008] The present disclosure is directed to inventive features that achieve and improve performance related to safe venting of fuel vapors and sealing to prevent leakage of liquid fuel from a vehicle's fuel tank.

[0009] In certain embodiments that may combine features of some or all of the above-described embodiments, a valve assembly includes: a housing having an interior cavity, an upper surface of the interior cavity being provided with a vent orifice in fluid communication with a vent outlet; a float assembly disposed within the interior cavity, the float assembly being movable along a longitudinal axis of the housing, the float assembly including a platform disposed on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to the longitudinal axis; and a membrane elongated along a longitudinal axis and including a first end secured to a first attachment portion of the float assembly, a second end disposed opposite the first end and secured to a second attachment portion of the float assembly, and a slack portion associated with the second end, wherein, corresponding to the float assembly being in an uppermost position along the longitudinal axis, the membrane is configured to cover and seal the vent orifice, at least a portion of the membrane being supported by the platform, wherein, upon movement of the float assembly away from the uppermost position, the membrane is configured to reopen the vent orifice, the reopening associated with the first end initiating peeling of the membrane from the vent orifice, and wherein at least a portion of the slack portion of the membrane includes a bend about an axis perpendicular to the longitudinal axis of the membrane.

[0010] In a specific embodiment that may combine some or all of the features of the above-described embodiments, the vent aperture comprises an elongated section aligned with the longitudinal axis of the membrane. In a specific embodiment that may combine some or all of the features of the above-described embodiments, the slack portion of the membrane facilitates sealing of the vent aperture by facilitating alignment and restraint of the membrane relative to the vent aperture. In a specific embodiment that may combine some or all of the features of the above-described embodiments, the upper surface of the platform comprises a concave cavity.

[0011] In a particular embodiment that may combine some or all of the features of the above-mentioned embodiments, the cavity comprises an elongated section aligned with the longitudinal axis of the platform.In a particular embodiment that may combine some or all of the features of the above-mentioned embodiments, the cavity comprises a protruding ridge oriented along the longitudinal axis of the platform.

[0012] In a specific embodiment that may combine some or all of the features of the above-described embodiments, the platform comprises a channel or groove provided at a peripheral edge of the cavity. In a specific embodiment that may combine some or all of the features of the above-described embodiments, the float assembly further comprises a hollow core segment. In a specific embodiment that may combine some or all of the features of the above-described embodiments, the hollow core segment of the float assembly is slidably coupled to the housing of the valve assembly.

[0013] In a specific embodiment that may combine some or all of the features of the above-described embodiments, the first attachment portion is offset from the second attachment portion along the longitudinal axis, the first attachment portion being offset relative to the second attachment portion toward the upper surface of the lumen. In a specific embodiment that may combine some or all of the features of the above-described embodiments, the platform is angled between 5 and 30 degrees relative to a plane orthogonal to the longitudinal axis.

[0014] In a particular embodiment that may combine some or all of the features of the above-described embodiments, the membrane comprises a fluoroelastomer. In a particular embodiment that may combine some or all of the features of the above-described embodiments, the fluoroelastomer is reinforced with one or more polymers. In a particular embodiment that may combine some or all of the features of the above-described embodiments, at least a portion of the membrane is sandwiched between the platform and the vent opening to seal the vent opening, corresponding to the float assembly being in an uppermost position.

[0015] In a particular embodiment that may combine some or all of the features of the above-described embodiments, the valve assembly comprises a clamp fastener for securing at least one of the first end and the second end of the membrane to a corresponding attachment portion of the float assembly. In a particular embodiment that may combine some or all of the features of the above-described embodiments, the clamp fastener comprises a post configured to be operatively coupled to the float assembly.

[0016] In a particular embodiment that may combine some or all of the features of the above-described embodiments, the membrane comprises at least one through-hole configured to engage with the post. In a particular embodiment that may combine some or all of the features of the above-described embodiments, the clip fastener comprises one or more of a hook and a notch configured to operatively couple with the float assembly.

[0017] In a specific embodiment that may combine the features of some or all of the above embodiments, a valve assembly system includes: a first valve assembly; a second valve assembly in fluid communication with the first valve assembly; and an exhaust outlet in fluid communication with the first valve assembly, wherein the first valve assembly includes: a housing having an inner cavity, an upper surface of the inner cavity being provided with an exhaust orifice in fluid communication with the exhaust outlet; a float assembly disposed in the inner cavity, the float assembly being movable along a longitudinal axis of the housing, the float assembly including a platform disposed on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to the longitudinal axis; and a membrane elongated along a longitudinal axis and The invention also provides a method for manufacturing a diaphragm according to the present invention, wherein the membrane is configured to cover and seal the vent orifice corresponding to the float assembly being in an uppermost position along the longitudinal axis, and at least a portion of the membrane is supported by the platform, wherein the membrane is configured to reopen the vent orifice based on movement of the float assembly away from the uppermost position, the reopening being associated with the first end initiating peeling of the membrane from the vent orifice, and wherein at least a portion of the slack portion of the membrane includes a bend about an axis perpendicular to the longitudinal axis of the membrane.

[0018] In a particular embodiment that may combine the features of some or all of the above-described embodiments, a method of assembling a valve assembly includes: disposing a float assembly within a housing based on slidably coupling a core segment of the float assembly to one or more guide structures of a housing of the valve assembly; providing a platform on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to a longitudinal axis of the housing; securing a first end of a membrane to a first attachment portion of the float assembly, wherein the membrane is elongated along a longitudinal axis, and wherein, corresponding to the float assembly being in an uppermost position along the longitudinal axis, the membrane is configured to cover and seal the exhaust port, and at least a portion of the membrane is supported by the platform; and securing a second end of the membrane to a second attachment portion of the float assembly, wherein a slack portion of the membrane is associated with the second end, and wherein at least a portion of the slack portion of the membrane includes a bend about an axis perpendicular to the longitudinal axis of the membrane.

[0019] In a particular embodiment, which may combine features of some or all of the above-described embodiments, a flexible strip is provided for sealing the valve orifice to prevent leakage of liquid fuel, as well as an inclined lower surface of the valve orifice and a corresponding inclined ramp on the float.

[0020] In a particular embodiment, which may combine features of some or all of the above-described embodiments, both ends of the flexible strap are coupled to the float upper surface at respective strap attachment portions.

[0021] In a particular embodiment, which may combine features of some or all of the above-described embodiments, the upper end of the strap is coupled to an upper strap attachment on the float, and the lower end of the strap is coupled to a lower strap attachment on the float.

[0022] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the lower end of the strap comprises a strap slack.

[0023] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the belt slack comprises a loop.

[0024] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the looped portion of the belt is looped downwardly from the rest of the belt.

[0025] In a particular embodiment, which may combine features of some or all of the above-described embodiments, the surface of the valve orifice engaging with the band is oval or elliptical or racetrack-shaped.

[0026] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the belt engaging portion of the inclined ramp of the float comprises a recessed cavity.

[0027] In a particular embodiment, which may combine features of some or all of the above-described embodiments, the cavity of the belt-engaging portion corresponds to the shape of the valve orifice surface with which the belt engages.

[0028] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the belt engagement portion on the inclined ramp of the float comprises one or more ridges.

[0029] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the belt engagement portion on the inclined ramp of the float comprises one or more cutouts.

[0030] In a particular embodiment, which may combine some or all of the features of the above-described embodiments, the belt is made of fluoroelastomer.

[0031] In a particular embodiment, which may combine the features of some or all of the above-described embodiments, the fluoroelastomer material of the belt is further reinforced with a polymer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described in more detail below based on the exemplary drawings. The present invention is not limited to the exemplary embodiments. Other features and advantages of various embodiments of the present invention will become apparent by reading the following detailed description with reference to the accompanying drawings, which show the following:

[0033] Figure 1 is a schematic cross-sectional side view illustrating a valve assembly system according to certain embodiments.

[0034] Figure 2 is a schematic exploded view illustrating certain components of a valve assembly according to certain embodiments.

[0035] Figure 3A is a schematic top perspective view of a valve assembly housing according to certain embodiments.

[0036] Figure 3B is a schematic top view of a valve assembly housing according to certain embodiments.

[0037] Figure 3C is a schematic diagram of an upper surface of an interior cavity of a valve assembly housing according to certain embodiments.

[0038] Figure 4 is a schematic perspective view of a float assembly and belt according to certain embodiments.

[0039] Figure 5 is a schematic cross-sectional front view of a valve assembly according to certain embodiments, showing an overview and an enlarged illustration of a float assembly near a top limit position.

[0040] Figure 6 is a schematic cross-sectional partial side view of a valve assembly according to certain embodiments.

[0041] Figure 7is a schematic top perspective view of a float assembly according to certain embodiments, with the band removed for illustration.

[0042] Figure 8 is an enlarged front perspective view schematically illustrating a portion of a float assembly with a belt removed, according to certain embodiments.

[0043] Figure 9A is a cross-sectional side view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0044] Figure 9B is a side view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0045] Figure 9C is a front perspective view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0046] Figure 10A is a cross-sectional side view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0047] Figure 10B is a rear view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0048] Figure 10C is a diagram schematically illustrating a front view of a float assembly with a belt installed, according to certain embodiments, with the inset showing a perspective view of a belt attachment clip.

[0049] Figure 11A is a perspective view schematically illustrating a float assembly with a belt installed, according to certain embodiments.

[0050] Figure 11B Included are schematic perspective views of belt attachment clips according to certain embodiments.

[0051] Figure 12 is a schematic partial cross-sectional side view of a float assembly with a belt installed, according to certain embodiments. DETAILED DESCRIPTION

[0052] To facilitate a better understanding of the present disclosure, the following examples of certain embodiments are provided. The following examples should not be construed as limiting or restricting the scope of the present disclosure. According to various embodiments of the present disclosure, various mechanisms, components, arrangements, and methods for assembling, manufacturing, and / or operating a vent valve for a fuel tank system are disclosed herein.

[0053] With reference to the accompanying drawings, Figure 1is a schematic cross-sectional side view illustrating a valve assembly system according to certain embodiments. In certain embodiments, the valve assembly system can include one or more valve assemblies. In certain embodiments, the valve assembly system 10 can include a valve assembly 100. In certain embodiments, the valve assembly system 10 can include multiple valve assemblies, such as valve assembly 20 and valve assembly 100. By way of example and not limitation, the valve assembly system can include a compact combo valve. By way of example and not limitation, the valve assembly can include a graded vent valve (GVV). By way of example and not limitation, the valve assembly can include a fill limit valve (FLV).

[0054] In certain embodiments, the base 30 of the valve assembly system 10 and / or valve assembly 100 can be fluidly connected to the fluid contents of the tank, such as to the surface of the liquid contents of the tank. In certain embodiments, the tank can be configured as a fuel tank. In certain embodiments, the base 30 can allow the contents of the tank to be in fluid communication with the valve assembly system 10 and / or valve assembly 100. In certain embodiments, the valve assembly system 10 and / or valve assembly 100 can be provided with an outlet port 40. In certain embodiments, the outlet port 40 can be located at the top of the valve assembly system 10 and / or valve assembly 100, such as by way of non-limiting example at Figure 1 As an example and not limitation, outlet port 40 may be an outlet conduit for fuel vapor released from the tank.

[0055] By way of illustration and not limitation, although the present disclosure may describe the details of a particular exhaust assembly (such as a staged exhaust valve) in the context of an exemplary valve assembly 100, the present disclosure fully contemplates any suitable valve assembly 100 based on the disclosed structure and / or function. As an example and not limitation, although the internal structural details of a fill check valve or any other suitable valve are omitted herein for clarity, it should be understood that the valve assembly 100 as disclosed herein can be deployed independently or in combination with other suitable valve assemblies as part of a valve assembly system 10.

[0056] Figure 2 is a schematic exploded view illustrating certain components of a valve assembly according to certain embodiments. In certain embodiments, the valve assembly 100 may include a housing 200 having a longitudinal axis LL. In certain embodiments, the housing 200 may include a valve orifice 220 at one end of the housing 200. In certain embodiments, the housing 200 may enclose or contain an internal cavity 230. In certain embodiments, the upper surface of the internal cavity 230 may be provided with an exhaust orifice 220. In certain embodiments, the valve orifice 220 may be in fluid communication with the exhaust outlet port 40.

[0057] In certain embodiments, the valve assembly 100 may include a float assembly 300. In certain embodiments, the float assembly 300 may be movable along a longitudinal axis LL in certain embodiments. In certain embodiments, the valve assembly 100 may include an end cap 400 on the base end of the housing 200. In certain embodiments, the side of the housing 200 opposite the base end of the housing 200 may include the upper side of the housing 200. In certain embodiments, in the context of this disclosure, "upper" may refer to a direction of travel of the movable float assembly 300 within the housing 200 opposite the base end of the housing 200. In certain embodiments, the valve orifice 220 may be located at or near the upper end of the housing 200 and / or valve assembly 100. In certain embodiments, the valve assembly 100 may include one or more gaskets, O-rings, seals, labyrinths, and / or other suitable structures for sealing and / or containing fluid flow, such as an O-ring 410. In particular embodiments, valve assembly 100 can include one or more biasing members, such as spring 420. In particular embodiments, a membrane, such as band 320, can be mounted on float assembly 300, as will be described further herein.

[0058] Figure 3A is a schematic top perspective view of a valve assembly housing according to certain embodiments. Figure 3B is a schematic top view of a valve assembly housing according to certain embodiments. Figure 3C is a schematic diagram of an upper surface of an interior cavity of a valve assembly housing according to certain embodiments.

[0059] In certain embodiments, the outer end 222 of the valve orifice 220 on the housing 200 can have a circular or nearly circular orifice form. In certain embodiments, the baffle or surrounding housing of the valve orifice 220 on the outer surface of the housing 200 can have a kidney-shaped form. In certain embodiments, the valve orifice 220 on the outer surface of the housing 200 can be configured to accommodate a valve, such as a ball valve or a disk valve. By way of example and not limitation, Figure 1 Ball valve 50 is shown assembled at valve orifice 220 of valve assembly 100. In particular embodiments, inner end 224 of valve orifice 220 on housing 200, such as viewed from within interior cavity 230 of housing 200, can have an elongated, oval, elliptical, and / or racetrack-shaped form.

[0060] In certain embodiments, the outer end 222 of the valve orifice 220 can be shaped to facilitate effective coupling and interoperation with the previously discussed valve mechanism. In certain embodiments, the inner end 224 of the valve orifice 220 can be shaped to facilitate effective coupling and interoperation with the band 320. In certain embodiments, the valve orifice 220 disposed within the housing 200 can transition between different shapes for the outer end 222 and the inner end 224 within the upper section of the housing 200 and / or along the longitudinal axis. In certain embodiments, the valve orifice 220 can transition within the housing 200 from a substantially circular outer end 222 to an elongated inner end 224. In certain embodiments, the valve orifice 220 can transition from a substantially circular or other suitably shaped valve-facing opening on the upper surface of the valve orifice 220 to a substantially elliptical, oval, racetrack-shaped, or other suitably shaped band-facing opening on the lower surface of the valve orifice 220. In certain embodiments, the exhaust orifice 220 can include an elongated section aligned with the longitudinal axis of the band 320. In particular embodiments, a substantially circular and / or nearly circular shape may have a perimeter where at least half of the perimeter's length or extent comprises a portion of a circle.

[0061] In certain embodiments, the float assembly 300 is slidably coupled to the housing 200, such as to be movable within the housing 200 along the longitudinal axis LL. In certain embodiments, one or both of the housing 200 and / or the float assembly 300 may be provided with suitable structure for facilitating interconnection, restraint, and / or relative movement of the float assembly 300 within the housing 200. In certain embodiments, the float assembly 300 and / or the housing 200 may be provided with guides, guide rails, and / or guide channels. In certain embodiments, the float assembly 300 may include a core, such as a central core, which may be hollow. In certain embodiments, such as described and illustrated herein by way of non-limiting example, such structure for facilitating interconnection, restraint, and / or relative movement of the float assembly 300 within the housing 200 may be provided at or near a joint section associated with the center and / or inner core of the float assembly 300. Additionally or alternatively, such structure for facilitating interconnection, restraint, and / or relative movement of the float assembly 300 within the housing 200 can be provided at or near the peripheral interface portion. By way of example and not limitation, the housing 200 can include one or more float guides 260. By way of example and not limitation, the float assembly 300 can include one or more float guide channels 360. By way of example and not limitation, the central core 305 of the float assembly 300 can be configured to slidably engage the central core 210 of the housing 200.

[0062] Figure 4is a schematic perspective view of a float assembly and belt according to certain embodiments. In certain embodiments, float assembly 300 can be disposed or positioned within housing 200 of valve assembly 100 such that float assembly 300 can translate along longitudinal axis LL of housing 200 and valve assembly 100. By way of example and not limitation, float assembly 300 can translate or otherwise move within housing 200 in response to the level of liquid fuel in a tank (such as a fuel tank). In certain embodiments, the respective materials of housing 200 and float assembly 300 can be selected such that the relative interfaces of the housing and float assembly exhibit desired characteristics of low friction and / or adequate clearance under a range of operating conditions.

[0063] In certain embodiments, while the longitudinal axis LL of the valve assembly 100 and / or housing 200 may be substantially vertical for a tank located on a horizontal surface (such as a fuel tank of a vehicle), if the tank is located on an inclined or non-horizontal surface, the longitudinal axis LL may not coincide with the vertical vector (i.e., parallel to the gravity vector). As a non-limiting example, if a vehicle including the tank is parked on or traversing a ramp, or if the vehicle has overturned, the transverse longitudinal axis LL of the float assembly 300 may not be aligned with the vertical vector. By way of example and not limitation, in such circumstances, the float assembly 300 may still be constrained within the housing 200. In certain embodiments, the float assembly 300 may be guided by a float guide (such as one or more float guides 260) and / or one or more float guide channels 360 to translate along the longitudinal axis LL of the housing 200, such as based on a buoyant force component acting on the float assembly 300. In certain embodiments, such as by way of non-limiting example, Figure 3C 、 Figure 7 and Figure 9C As shown in FIG, a float guide 260 may be located on the housing 200 to engage with a corresponding float guide channel 360 located on the float assembly 300 for facilitating and selectively restricting movement of the float assembly 300 within the housing 200.

[0064] Figure 5 is a schematic cross-sectional front view of a valve assembly according to certain embodiments, showing an overview and an enlarged illustration of a float assembly near a top limit position.

[0065] Also shown, by way of example and not limitation, is an approximate path 250 for releasing fuel vapor from the tank through the valve assembly 100. By way of example and not limitation, while the position of the float assembly 300 along the longitudinal axis LL may be determined by a liquid level (such as the liquid level in the fuel tank), as described above, a small gap (e.g., a radial gap along the approximate path 250) may exist between the float assembly 300 and the housing 200 at their relative junctions. By way of example and not limitation, fuel vapor from the tank may flow through the float assembly 300 through this small gap and may occupy the volume above the float assembly 300 within the interior cavity 230 of the housing 200. In certain embodiments, as previously described, a valve mechanism (such as a disk head valve or a ball valve) may be located at the outlet of the valve orifice 220 in the housing 200. In certain embodiments, the valve mechanism may be designed and calibrated to open at a predetermined pressure level, such as to release accumulated fuel vapor through the outlet port 40. By way of example and not limitation, a disk valve or ball valve may be designed to open at vapor pressures exceeding 5 kPa to prevent pressure buildup above the designed opening pressure.

[0066] In certain embodiments, it may be desirable to close and seal valve orifice 220 to prevent liquid leakage, such as leakage of liquid fuel. As non-limiting examples, overfilling of liquid fuel, tilting of the fuel tank at an angle, and / or a vehicle rollover event may require sealing valve orifice 220 to prevent liquid fuel leakage. Additionally, in certain embodiments, it may be desirable to quickly restore functionality of the vapor release passage through valve orifice 220 following a sealing event of valve orifice 220. In certain embodiments, such restoration of fluid flow through valve orifice 220 may be provided by reopening valve orifice 220, for example, when the risk of liquid fuel leakage has decreased. As a non-limiting example, it may be desirable to allow valve orifice 220 to be used again to release fuel vapors after the liquid fuel level has decreased to a safe, lower level.

[0067] In certain embodiments, a membrane (such as band 320) may be provided for sealing the valve orifice. In certain embodiments, the membrane (such as band 320) may be elongated along a longitudinal axis. In certain embodiments, the membrane (such as band 320) may include a first end, a second end disposed opposite the first end, and a slack portion associated with the second end. By way of example and not limitation, the band 320 may operate based on the float assembly 300 being raised and / or otherwise moved within the housing 200 such that the band 320 abuts the valve orifice 220 in the housing 200. By way of continuing non-limiting example, the band 320, which may be provided for sealing the valve orifice 220, may also be designed to effectively and / or quickly open ("unseal") and restore the opening of the valve orifice 220 (e.g., the inner end 224), thereby restoring normal fluid discharge (e.g., fuel vapor discharge) function. In some such embodiments, for example, effective unsealing and / or reopening of the band 320 may rely on equalization of fluid pressure differentials that may exist (e.g., across the band 320), and these pressure differentials may hinder reopening of the band 320. Thus, in certain embodiments, the interaction between the design and features of the band 320, the float assembly 300, and / or the valve orifice 220 may control the efficacy and performance of the sealing and reopening properties of the valve assembly 100. Related structural and functional aspects are discussed further below.

[0068] Depending on the specific embodiment, the band 320 may comprise a relatively flexible yet durable member, film, or sheet, as required to reliably perform the aforementioned functions of effective sealing and rapid reopening. In certain embodiments, the band 320 may be relatively thin. As non-limiting examples, in certain embodiments, the band 320 may comprise one or more materials including synthetic rubber, fluoropolymers, fluorosilicone, and / or silicone rubber. In certain embodiments, the base material of the band 320 may optionally be reinforced with other materials, such as polyester or other polymers.

[0069] Figure 6 is a schematic cross-sectional partial side view of a valve assembly according to certain embodiments. In certain embodiments, a platform (such as ramp 330) can be provided on float assembly 300, such as on an upper surface of float assembly 300. In certain embodiments, ramp 330 can support band 320 in a seated and / or sealed position of band 320.

[0070] Figure 7 is a schematic top perspective view of a float assembly according to certain embodiments, with the band removed for illustration. Figure 8 is an enlarged front perspective view schematically illustrating a portion of a float assembly with a belt removed, according to certain embodiments.

[0071] In particular embodiments, strap 320 may be coupled to float assembly 300 at one or more strap attachment portions provided on float assembly 300. Additionally or alternatively, external attachment structures, such as one or more fasteners and / or clips 356, may be used to couple one or more respective ends of strap 320 to float assembly 300 and / or hull 200.

[0072] By way of example and not limitation, the ends of strap 320 can be configured to be secured to two strap attachments on float assembly 300. Depending on the particular embodiment (not shown), one or both of the strap attachment locations can be provided on the hull rather than on the float. By way of example and not limitation, one or more ends of strap 320 can be provided with corresponding through-holes, such as through-hole 326, for securing strap 320 to strap attachments provided on float assembly 300 and / or to hull 200.

[0073] Figures 9A to 9C A float assembly with a belt mounted thereon is schematically shown according to a particular embodiment. In a particular embodiment, as Figure 7 9 , by way of non-limiting example, float assembly 300 can include a first strap attachment portion 352 and / or a second strap attachment portion 354. In particular embodiments, first strap attachment portion 352 can be offset from second strap attachment portion 354 along longitudinal axis LL. In particular embodiments, first strap attachment portion 352 can be offset toward interior cavity 230 and / or an upper surface of housing 200 relative to second strap attachment portion 354.

[0074] In such Figure 6 and Figure 10A In the particular embodiment shown, when the valve orifice 220 is sealed by the band 320, an interfacing portion of the valve orifice 220 (e.g., the inner end 224) on the housing 200 can contact and engage the band 320. In particular embodiments, this interfacing portion of the valve orifice 220 (e.g., the inner end 224) can also be angled or skewed. By way of example and not limitation, the inner end 224 of the valve orifice 220, the band 320, and / or the beveled surface 330 can be angled or skewed such that, in a sealed configuration, some or all of the inner end, the band, and / or the beveled surface can be aligned with one another. In particular embodiments, this mutual alignment can be configured such that the band 320 can be sandwiched and / or otherwise tightly retained in an angled, tilted, and / or skewed orientation between corresponding angled surfaces of the valve orifice 220 and / or the angled beveled surface 330 on the float assembly 300.

[0075] In certain embodiments, the inclined surface 330 is angled relative to a plane normal to the longitudinal axis LL. In certain embodiments, the angle formed by the inclined surface 330 relative to the plane normal to the longitudinal axis LL is between 5 degrees and 30 degrees. In certain embodiments, the angle formed by the inclined surface 330 relative to the plane normal to the longitudinal axis LL is between 10 degrees and 15 degrees.

[0076] Figure 10A is a cross-sectional side view schematically illustrating a float assembly with a belt installed, according to certain embodiments. Figure 10B is a rear view schematically illustrating a float assembly with a belt installed, according to certain embodiments. Figure 10C is a diagram schematically illustrating a front view of a float assembly with a belt installed, according to certain embodiments, with the inset showing a perspective view of a belt attachment clip.

[0077] In certain embodiments, as by at least Figure 6 、 Figure 9A 、 Figure 10A and Figure 11A As shown in the non-limiting example of FIG, a first end of the strap 320 can be coupled or otherwise secured to the first strap attachment portion 352 so as to maintain relative tension or stretch at that location. In certain embodiments, the strap 320 can include a portion having a strap slack 324 at or near a second end of the strap 320, opposite the first end of the strap 320. In certain embodiments, the second end of the strap 320 can be coupled or otherwise secured to the second strap attachment portion 354, such that the strap slack 324 is disposed at or near the second strap attachment portion 354.

[0078] In certain embodiments, at least a portion of the strap slack 324 may be provided at or near a strap attachment portion (such as the second strap attachment portion 354) in the form of a bend and / or loop having a usable strap length. Figure 6 、 Figure 9A 、 Figure 11A and Figure 12 As shown by way of non-limiting example in FIG, a loop or curved portion associated with the strap slack 324 may be curled or spiraled downwardly or away from the valve orifice 220 from the main or remaining extent of the strap and then coupled to the second strap attachment portion 354. In particular embodiments, the loop may be curled upwardly and / or toward the valve orifice 220 from the main or remaining extent of the strap (not shown here) and then coupled to the second strap attachment portion 354.

[0079] If at least Figure 7 and Figure 8As shown by way of non-limiting example in FIG, in certain embodiments, the ramp 330 on the float assembly 300 may be provided with a band-engaging portion 310 for supporting the band 320 in its seated and / or sealed position. By way of example and not limitation, the band-engaging portion 310 may be provided with a form or shape corresponding to the shape of the opening of the valve orifice 220 facing the band (e.g., the inner end 224). In certain embodiments, the band-engaging portion 310 on the float assembly 300 may include a recessed cavity 312. In certain embodiments, one or more protruding ridges, such as ridge 340, may be provided within or adjacent to the band-engaging portion 310. By way of example and not limitation, the ridges 340 may provide rigidity to the band 320 during events including seating the band 320 on the ramp 330 and / or sealing the valve orifice 220. In certain embodiments, the ridges 340 may help prevent the band 320 from wrinkling, flipping, folding, and / or misalignment relative to the band-engaging portion 310, depending on the desired configuration and engagement surface of the band 320. By way of example and not limitation, when the valve orifice 220 is sealed by the band 320, the ridge 340 can help support and / or retain the band 320 aligned with the valve orifice 220 to prevent fluid from leaking through the valve orifice 220, wherein the band 320 can be sandwiched or appropriately retained between the valve orifice 220 and the band engaging portion 310. By way of example and not limitation, at least Figure 7 and Figure 8 3. In certain embodiments, the ridge 340 can be oriented along the length and / or axis of the band 320 and / or the ramp 330 and / or the inner end 224 of the valve orifice 220.

[0080] As discussed, in certain embodiments, the function of the band 320 can be to cover and / or otherwise seal the vapor release passage through the valve orifice 220. By way of example and not limitation, the band 320 can be configured to seal the valve orifice 220 when the liquid fuel level has caused the float assembly 300 to move to a maximum limit position of the float assembly 300 to prevent accidental leakage of liquid fuel through the valve orifice 220. By way of example and not limitation, in operation, the float assembly 300 can rise in response to a rise in the liquid fuel level so that the upper surface of the band 320 can engage the inner end 224 of the valve orifice 220 located in the housing 200. By way of example and not limitation, Figure 6 The float assembly 300 is shown with the installed band 320 approaching the uppermost range of travel of the float assembly 300, wherein the upper surface of the band 320 is about to seat and seal shut off the valve orifice 220 based on the progressive upward movement of the float assembly 300 along the longitudinal axis LL to its uppermost position.

[0081] In particular embodiments, the relatively soft and deformable form and / or material of the membrane (e.g., band 320) may further compress relative to a more rigid, harder, and / or stiffer material to provide a better seal around the inner end 224 of the valve orifice 220 when the float assembly 300 moves to its uppermost range along the LL.

[0082] As already discussed, in certain embodiments, band 320 may be designed to quickly restore fluid flow functionality of valve orifice 220, such as for fuel vapor release, and such as when the liquid fuel level may have decreased, allowing float assembly 300 to travel below a previous uppermost range or limit. In certain embodiments, in this non-limiting scenario, it may be desirable for the longitudinal movement of float assembly 300 to closely and quickly follow the decreasing level of liquid (e.g., liquid fuel) to effectively and quickly uncover valve orifice 220 (e.g., vapor release valve passageway) to restore the ability to release unwanted fuel vapor. However, absent certain features contemplated and disclosed herein, float assembly 300 may not be easily retracted from its uppermost range (e.g., downward) based on a decrease in the liquid level (e.g., the liquid fuel level in the tank). By way of example and not limitation, this form of potential difficulty or recalcitrance in the downward movement of the float assembly 300 may occur in certain circumstances and implementations because the transient fluid pressure within the interior cavity 230 of the housing 200 located above the float assembly 300 may tend to decrease based on the initial volume increase of the interior cavity 230. Thus, by way of non-limiting example, the corresponding decrease in pressure above the float assembly 300 may prevent the float assembly 300 from moving away from its uppermost range (e.g., downward) based on the relative pressure differential formed across the upper surface of the float assembly 300 (i.e., between the upper and lower sides). Alternatively or additionally, following the initial closing and sealing event of the band 320 against the valve orifice 220, the relative pressure conditions within the valve orifice 220 (e.g., in the fuel vapor release passage) may tend to keep the band 320 closed. In such circumstances, for example, it may be desirable to specifically design the band 320 to intentionally (i.e., by design) and quickly reopen to equalize pressure above and below the band 320 and / or across the float assembly 300 to allow the float assembly 300 to move in unison with the lowering liquid level, thereby exposing the valve orifice 220 and the corresponding vapor release passage.

[0083] In certain embodiments, based on the seated and / or sealed position of the band 320, the lower surface of the band 320 may rest completely on the angled ramp 330 of the float assembly 300. In certain embodiments, either alone or in addition, the upper surface of the band 320 may maintain a seal against the similarly angled or inclined inner end 224 of the valve orifice 220. In certain embodiments, the release of air or other gas in the cavity 312 in the band-engaging portion 310 of the ramp 330 (such as at least Figure 7 and Figure 8 310 and / or the valve orifice 220, such as for a tighter fit and / or seal. In certain embodiments, one or more ridges (such as ridge 340) can support the strap 320 from collapsing (such as collapsing into the cavity 312 of the strap joint 310). In certain embodiments, the cavity 312 can include an elongated section aligned with the ramp 330 and / or the length or axis of the strap 320.

[0084] In certain embodiments, the first end of the strap 320 may be associated with an upper attachment portion (e.g., first strap attachment portion 352). In certain embodiments, the second end of the strap 320 may be associated with a lower attachment portion (e.g., second strap attachment portion 354). Furthermore, in certain embodiments, the second end of the strap 320 may be provided with a strap slack 324. In certain embodiments, the strap slack 324 may be wound in a spiral or loop along an axis perpendicular to the longitudinal axis of the strap 320 (upward or downward).

[0085] In certain embodiments, when a fluid level associated with the valve assembly 100 (such as a fuel tank fluid level) initially drops below a level corresponding to the uppermost range of the float assembly 300, the resulting force (e.g., a downward force and / or a force directed away from the uppermost range) acting on the float assembly 300 may initially act on the band 320 at its relatively taut first end, which is secured at the first band attachment portion 352. In certain embodiments, a band slack portion 324 disposed at or near a relatively lower band attachment portion (e.g., the second band attachment portion 354) may prevent the band 320 from initially experiencing the resulting force at the second end of the band 320. Thus, in certain embodiments, the tilted and seated first (upper) end of the band 320 may be effectively and rapidly withdrawn from the valve orifice 220 via a combined peeling action or effect, thereby quickly neutralizing any pressure differential that may have otherwise prevented the float assembly 300 from effectively moving (e.g., translating downwardly) along the longitudinal axis of motion LL away from its uppermost range. In particular embodiments, as movement of float assembly 300 away from the uppermost range continues, the second (lower) end of the belt may temporarily lose some of the slack exhibited in its belt slack 324 as belt 320 may temporarily lift above ramp 330 of float assembly 300 .

[0086] In certain embodiments, while the band slack 324 can facilitate prompt and effective reopening of the valve orifice 220 as described above, in certain embodiments, providing the band slack 324 configured as one or more appropriately formed band loops at the second end of the band 320 can also provide additional or alternative benefits related to sealing the valve orifice 220 by the band 320. By way of example and not limitation, based on the disclosed form and / or material of the band 320 and the form of the one or more loops, the band slack 324 can act as a tensioned spring to reinforce the band 320 as it rises from the inclined ramp 330 of the float assembly 300, thereby preventing the float assembly 300 from wrinkling, flipping, folding, or other undesirable deformation or misalignment. By way of example and not limitation, high fluid flow rates near the band 320 can generate significant pressure and / or forces based on the band's interaction and / or dynamics with the fluid, which can cause the band 320 to shift, misalign, and / or otherwise hinder effective positioning of the band 320 relative to the valve orifice 220. In particular embodiments, the aforementioned beneficial aspects of the band slack 324 (including, but not limited to, in the form of one or more annular portions) can thus provide rigidity to the band 320. In particular embodiments, the aforementioned beneficial aspects of the band slack 324 can facilitate the ability to constrain and / or present the band 320 to the valve orifice 220 in a flat and aligned manner, thereby improving the sealing performance of the band 320 relative to the valve orifice 220.

[0087] In certain embodiments, one or more channels, grooves, and / or cutouts, such as cutouts 314, may be provided at the tape joint 310. By way of example and not limitation, cutouts 314 may prevent air and / or other gases from being trapped within the cavity 312 of the tape joint 310. By way of non-limiting example, in the absence of cutouts 314, suction or a vacuum may form within the cavity 312 of the tape joint beneath the seated tape 320, thereby potentially preventing the tape 320 from being quickly and / or effectively peeled away when reopening the sealed configuration is desired.

[0088] Figure 11A is a perspective view schematically illustrating a float assembly with a belt installed, according to certain embodiments. Figure 11B Included are schematic perspective views of belt attachment clips according to certain embodiments. Figure 12 is a schematic partial cross-sectional side view of a float assembly with a belt installed, according to certain embodiments.

[0089] In certain embodiments, the strap attachment portion can have a structure and form for properly securing and restraining the strap, as described herein. In certain embodiments, the strap attachment portion can be configured, alone or in addition, for durability, ease of manufacture, and / or ease of assembly. In certain embodiments, the strap attachment portion can include, as non-limiting examples, one or more levers, clamps, buttons, posts, split posts, notches, hinges, and / or snaps. By way of example and not limitation, Figure 7 and Figure 9A Shown are buttons provided on float assembly 300 as first and second strap attachment portions 352, 354, configured to engage and secure with corresponding through-holes 326 of strap 320. By way of example and not limitation, Figures 10A to 10C A specific embodiment of a clamp 356 is shown. By way of example and not limitation, Figures 11A to 11B and Figure 12 Another embodiment of a clamp 356 is shown.

[0090] In certain embodiments, the clamp 356 can include one or more posts, such as post 358. In certain embodiments, the one or more posts of the clamp 356 can be configured to pass through one or more corresponding through-holes 326 of the band 320. In certain embodiments, the clamp 356 can include one or more features, including a hook or latch 357, which can be configured to engage with the float assembly 300. In certain embodiments, the float assembly 300 can be provided with suitable features for engaging with each hook or latch 357 of each clamp 356. In certain embodiments, the clamp 356 can include one or more notch features, such as notch 359.

[0091] In view of the disclosed exemplary embodiments, it is now believed that the benefits and advantages of the present inventive concepts have been fully demonstrated.

[0092] Miscellaneous

[0093] The foregoing description of the embodiments has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the present disclosure. The individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but are interchangeable where applicable and can be used in a selected embodiment even if not specifically shown or described. For example, it is possible that each feature described in one of the multiple instances of the embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments that may not be described in words or by reference to the accompanying drawings but are fully contemplated. It will also be understood that changes and modifications may be made by those of ordinary skill in the art within the scope of the present disclosure, the illustrations and / or the appended claims. Such variations are fully contemplated herein and should not be considered as departing from the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

[0094] The terms used in the claims should be interpreted to have the broadest reasonable interpretation consistent with the preceding description. For example, the use of the article "a" or "the" when introducing an element should not be interpreted as excluding a plurality of elements. Similarly, the statement of "or" should be interpreted as inclusive, so that the statement of "A or B" does not exclude "A and B" unless it is clear from the context or the preceding description that only one of A and B is intended. In addition, the statement "at least one of A, B, and C" should be interpreted as one or more of a group of elements consisting of A, B, and C, and should not be interpreted as requiring at least one of each of the listed elements A, B, and C, regardless of whether A, B, and C are related as categories or otherwise. In addition, the statement "A, B, and / or C" or "at least one of A, B, or C" should be interpreted to include any singular entity from the listed elements, such as A, from any subset of the listed elements, such as A and B, or the entire list of elements A, B, and C.

[0095] It should be noted that the figures provided herein may be shown schematically rather than literally or precisely; components and aspects of the figures may not necessarily be to scale. In addition, while in many cases the same reference numerals or numbers may designate corresponding parts throughout the different views, the same parts may not always be provided with the same reference numerals or numbers in each view. In addition, similar parts may not be labeled in every view or figure. The numerical ranges listed in this application should be interpreted as including the endpoints of the ranges. Specific axes (such as one or more rotational axes, transverse axes, and / or longitudinal axes) that may be omitted in some of the illustrations herein should be interpreted as being present in each illustration or situation in which they are mentioned or in which they reasonably correspond.

Claims

1. A valve assembly comprising: a housing having an inner cavity, wherein an upper surface of the inner cavity is provided with an exhaust port in fluid communication with the exhaust outlet; a float assembly disposed within the inner cavity, the float assembly being movable along a longitudinal axis of the housing, the float assembly comprising a platform disposed on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to the longitudinal axis; and a membrane elongated along a longitudinal axis and comprising a first end secured to a first attachment portion of the float assembly, a second end disposed opposite the first end and secured to a second attachment portion of the float assembly, and a slack portion associated with the second end, wherein, corresponding to the float assembly being in an uppermost position along the longitudinal axis, the membrane is configured to cover and seal the vent opening, at least a portion of the membrane being supported by the platform, wherein upon movement of the float assembly away from the uppermost position, the membrane is configured to reopen the vent aperture, the reopening being associated with the first end initiating peeling of the membrane from the vent aperture, and Here, at least a portion of the slack portion of the film includes a bend around an axis perpendicular to the longitudinal axis of the film.

2. The valve assembly according to claim 1, wherein The vent aperture includes an elongated section aligned with the lengthwise axis of the membrane.

3. The valve assembly according to claim 1, wherein The slack portion of the membrane facilitates sealing of the vent orifice by facilitating alignment and restraint of the membrane relative to the vent orifice.

4. The valve assembly according to claim 1, wherein The upper surface of the platform includes a concave cavity.

5. The valve assembly according to claim 4, wherein The cavity includes an elongated section aligned with the longitudinal axis of the platform.

6. The valve assembly according to claim 4, wherein The cavity includes a protruding ridge oriented along the longitudinal axis of the platform.

7. The valve assembly according to claim 4, wherein: The platform includes a channel or groove provided at a peripheral edge of the cavity.

8. The valve assembly according to claim 1, wherein The float assembly also includes a hollow core section.

9. The valve assembly according to claim 8, wherein: The hollow core section of the float assembly is slidably coupled to the housing of the valve assembly.

10. The valve assembly according to claim 1, wherein The first attachment portion is offset from the second attachment portion along the longitudinal axis, the first attachment portion being offset relative to the second attachment portion toward an upper surface of the inner cavity.

11. The valve assembly according to claim 1, wherein The platform is angled between 5 and 30 degrees relative to a plane normal to the longitudinal axis.

12. The valve assembly according to claim 1, wherein The membrane comprises a fluoroelastomer.

13. The valve assembly according to claim 12, wherein: The fluoroelastomer is reinforced with one or more polymers.

14. The valve assembly according to claim 1, wherein Corresponding to the float assembly being in an uppermost position, at least a portion of the membrane is sandwiched between the platform and the vent aperture to seal the vent aperture.

15. The valve assembly of claim 1, further comprising a clamp fastener for securing at least one of the first end and the second end of the membrane to a corresponding attachment portion of the float assembly.

16. The valve assembly according to claim 15, wherein The clip fastener includes a post configured to operatively couple with one or more of the membrane and the float assembly.

17. The valve assembly according to claim 16, wherein The membrane includes at least one through-hole configured to engage the post.

18. The valve assembly of claim 15, wherein: The clip fastener includes one or more of a hook and a notch configured to operatively couple with the float assembly.

19. A valve assembly system comprising: a first valve assembly; a second valve assembly in fluid communication with the first valve assembly; as well as an exhaust outlet in fluid communication with the first valve assembly, Wherein, the first valve assembly comprises: a housing having an inner cavity, wherein an upper surface of the inner cavity is provided with an exhaust port in fluid communication with the exhaust outlet; a float assembly disposed within the inner cavity, the float assembly being movable along a longitudinal axis of the housing, the float assembly comprising a platform disposed on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to the longitudinal axis; and a membrane elongated along a longitudinal axis and comprising a first end secured to a first attachment portion of the float assembly, a second end disposed opposite the first end and secured to a second attachment portion of the float assembly, and a slack portion associated with the second end, wherein, corresponding to the float assembly being in an uppermost position along the longitudinal axis, the membrane is configured to cover and seal the vent opening, at least a portion of the membrane being supported by the platform, wherein upon movement of the float assembly away from the uppermost position, the membrane is configured to reopen the vent aperture, the reopening being associated with the first end initiating peeling of the membrane from the vent aperture, and Here, at least a portion of the slack portion of the film includes a bend around an axis perpendicular to the longitudinal axis of the film.

20. A method of assembling a valve assembly, comprising: disposing the float assembly within the housing based on slidably coupling a core segment of the float assembly to one or more guide structures of the housing of the valve assembly; providing a platform on an upper surface of the float assembly, the platform being angled relative to a plane orthogonal to a longitudinal axis of the housing; securing a first end of a membrane to a first attachment portion of the float assembly, wherein the membrane is elongated along a longitudinal axis, and wherein, corresponding to the float assembly being in an uppermost position along the longitudinal axis, the membrane is configured to cover and seal the vent aperture and at least a portion of the membrane is supported by the platform; A second end of the membrane is secured to a second attachment portion of the float assembly, wherein a slack portion of the membrane is associated with the second end, and wherein at least a portion of the slack portion of the membrane includes a bend about an axis perpendicular to the lengthwise axis of the membrane.

Images