VALVE ASSEMBLY FOR A TANK OF A VEHICLE
TECHNICAL FIELD
[0001] The present teachings generally include a valve assembly for a tank of a
vehicle.
BACKGROUND
[0002] Fuel tank valves that function to vent vapors from a fuel tank are known.
Generally, the vapors are vented to a canister that stores the vapors and is periodically
purged. Fuel tank valves are configured to prevent liquid fuel in the fuel tank from entering
the canister even when a vehicle is parked on a grade.
SUMMARY
[0003] The present teachings generally include a valve assembly for a tank of a
vehicle. The valve assembly includes a valve body adapted to be attached to the tank. The
valve body includes a seat disposed inside the valve body. The seat defines an outlet for
venting the tank. The valve assembly also includes a float disposed inside the valve body.
The float is movable between a first position and a second position relative to the valve body
in response to a liquid fluid level inside the tank. The valve assembly further includes a
support coupled to the float. The support is movable with the float between the first and
second positions. In addition, the valve assembly includes a sealing member attached to the
support and having a base abutting the support. The sealing member has an engagement
portion supported by the base to define a space between the engagement portion and the
support to allow movement of the engagement portion between an initial position when the
float is in the first position and a displaced position when the float is in the second position.
The engagement portion is spaced from the seat when in the initial position to allow fluid
communication through the outlet. The engagement portion engages the seat when in the
displaced position such that the space decreases in size and the engagement portion deforms
about the seat to cover the outlet and minimize fluid communication through the outlet.
[0004] The float and the support can include a centering mechanism for centering
the support relative to a longitudinal axis to position the engagement portion of the sealing
member relative to the seat.
[0005] The above features and advantages and other features and advantages of the
present teachings are readily apparent from the following detailed description of the best
modes for carrying out the present teachings when taken in connection with the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 is a schematic partial cross-sectional side illustration of a valve
assembly internally mounted to a tank, with a vapor control structure cooperating with the
valve assembly.
[0007] Figure 2 is a schematic partial cross-sectional side illustration of the valve
assembly externally mounted to the tank, with the vapor control structure cooperating with
the valve assembly.
[0008] Figure 3 is a schematic perspective exploded view of the valve assembly.
[0009] Figure 4 is a schematic cross-sectional view of the valve assembly with a
float in a first position and an engagement portion of a sealing member in an initial position.
[0010] Figure 5 is a schematic fragmentary cross-sectional view of the valve
assembly with the float in a second position and the engagement portion of the sealing
member in a displaced position.
[0011] Figure 6 is a schematic cross-sectional view of a support and the sealing
member.
DETAILED DESCRIPTION
[0012] Referring to the Figures, wherein like numerals indicate like or
corresponding parts throughout the several views, a valve assembly 10 for a tank 12 of a
vehicle is generally shown in Figures 1 and 2. In certain embodiments, the tank 12 can be a
fuel tank 12 of the vehicle. Therefore, liquid fluid, such as fuel can be stored in the tank 12.
It is to be appreciated that the valve assembly 10 can be utilized with tanks 12 other than fuel
tanks 12. For example, the valve assembly 10 can be mounted to a urea tank in a vehicle.
Therefore, other liquid fluids can be stored in the tank 12.
[0013] Generally, the valve assembly 10 is attached to the tank 12. The valve
assembly 10 can be internally mounted to the tank 12 as shown in Figure 1 or externally
mounted to the tank 12 as shown in Figure 2. For the internally mounted valve assembly 10,
the assembly 10 can be supported by a bracket 13 inside the tank 12. For the externally
mounted valve assembly 10, a portion of the valve assembly 10 is disposed inside the tank 12
and another portion of the valve assembly 10 is disposed outside of the tank 12 as shown in
Figure 2. The features of the valve assembly 10 discussed herein are the same for the
internally mounted valve assembly 10 and the externally mounted valve assembly 10. It is to
be appreciated that other components can be utilized with the internally or externally
mounted valve assembly 10, such as, for example, a nipple 15 (see Figure 1) that can extend
through the tank 1 to couple the internally mounted valve assembly 10 inside the tank 12 to
components outside of the tank 12.
[0014] Generally, the valve assembly 10 allows vapor that build up in the tank 12 to
be vented out of the tank 12 to a vapor control structure 14. The vapor control structure 14
can store the vapor received from the tank 12 and can be periodically purged. Therefore,
under certain conditions, the vapors move or flow from the tank 12 through the valve
assembly 10 and into the vapor control structure 14. It is to be appreciated that the vapor
control structure 14 can be referred to as a canister, such as a charcoal canister.
[0015] Referring to Figures 1-3, the valve assembly 10 includes a valve body 16
adapted to be attached to the tank 12. Simply stated, the valve body 16 is attached or
mounted to the tank 12 either internally or externally as discussed above. For the externally
mounted valve assembly 10 as shown in Figure 2, a first portion 18 of the valve body 16 is
disposed inside of the tank 12 and a second portion 20 of the valve body 16 is disposed
outside of the tank 12. Therefore, generally, the vapors vented out of the tank 12 move or
flow from the first portion 18 into the second portion 20 and out to the vapor control structure
14.
[0016] Turning to Figures 3-5, the valve body 16 includes a seat 22 disposed inside
the valve body 16. The seat 22 will be referred to as a first seat 22 for the below discussion.
The valve body 16 can define a cavity 24 along a longitudinal axis 26, with the first seat 22
disposed in the cavity 24. The first seat 22 can be coupled to the first and/or second portion
18, 20 of the valve body 16. As shown in Figures 4 and 5, in certain embodiments, the first
seat 22 can be attached to the second portion 20 of the valve body 16. The first seat 22 can
be attached to the first and/or second portion 18, 20 by a snap fit, fasteners, tabs, etc. It is to
be appreciated that the first seat 22 can be integrally formed with the valve body 16. In other
words, the first seat 22 and the valve body 16 can be formed of one piece.
[0017] As best shown in Figure 4, generally, the first seat 22 defines an outlet 28 for
venting the tank 12. Therefore, the outlet 28 and the cavity 24 can be in fluid communication
with each other and in fluid communication with the vapor control structure 14 for venting
the vapor out of the tank 12 and into the vapor control structure 14. The outlet 28 can be
disposed along the longitudinal axis 26. The first seat 22 can present an end face 30 further
defining the outlet 28 and will be discussed further below.
[0018] The first seat 22 can be attached or mounted to the valve body 16 such that
the cavity 24 is split into a first cavity portion 32 and a second cavity portion 34. Generally,
the first cavity portion 32 is disposed in the first portion 18 of the valve body 16 and the
second cavity portion 34 is disposed in the second portion 20 of the valve body 16.
Therefore, the vapors move or flow from the first cavity portion 32 through the outlet 28 and
into the second cavity portion 34. Simply stated, the outlet 28 is disposed between the first
and second cavity portions 32, 34.
[0019] The valve body 16 can further include a plate 36 supporting the first seat 22
and further splitting or separating the cavity 24 into the first and second cavity portions 32,
34. The first seat 22 can extend outwardly from the plate 36 into the first cavity portion 32.
The plate 36 can be coupled to the first and/or second portions 18, 20 of the valve body 16
such that the plate 36 is sealed to the first and/or second portions 18, 20. Therefore, fluid
cannot seep between the plate 36 and the valve body 16. As shown in Figure 4, the plate 36
can be attached to the second portion 20 of the valve body 16. The plate 36 can be attached
to the first and/or second portions 18, 20 by a snap fit, fasteners, tabs, etc. It is to be
appreciated that the plate 36 and the first seat 22 can be integrally formed to each other. In
other words, the plate 36 and the first seat 22 can be formed of one piece. Furthermore, it is
to be appreciated that the plate 36, the first seat 22 and the valve body 16 can be integrally
formed to each other or formed of one piece.
[0020] Referring to Figures 3 and 4, the valve assembly 10 further includes a float
38 disposed inside the valve body 16. More specifically, the float 38 is disposed in the cavity
24 and is movable relative to the first seat 22. Generally, the float 38 can be movable along
the longitudinal axis 26. Specifically, the float 38 is movable between a first position and a
second position relative to the valve body 16 in response to a liquid fluid level 40 (see
Figures 1 and 2) inside the tank 12. In other words, when the float 38 is combined with a
biasing force, which is discussed further below, the float 38 is buoyant in the liquid fluid,
such as fuel, stored in the tank 12. Thus, the float 38 can move along the longitudinal axis 26
depending on the liquid fluid level 40 of the fuel inside the tank 12. For example, if the
liquid fluid level 40 rises, the float 38 moves toward the first seat 22 and the plate 36. As
another example, if the liquid fluid level 40 descends, the float 38 moves away from the first
seat 22 and the plate 36. The float 38 is shown in the first position in Figure 4 and the float
38 is shown in the second position in Figure 5.
[0021] Continuing with Figures 3 and 4, the float 38 can include a first end 42 and a
second end 44 spaced from each other along the longitudinal axis 26. Generally, the first end
42 faces the first seat 22 and the second end 44 opposes the first end 42. More specifically,
the first end 42 of the float 38 and the end face 30 of the first seat 22 face each other. The
float 38 can include a bulge 45 disposed between the first and second ends 42, 44, with the
bulge 45 surrounding the float 38 to assist in aligning or centering the f oat 38 relative to the
first seat 22.
[0022] Generally, the bulge 45 extends outwardly away from the longitudinal axis
26 and faces the inner surface of the first portion 18 of the valve body 16. In one
embodiment, the bulge 45 is disposed adjacent to the first end 42 of the float 38. For
example, the bulge 45 assists in aligning or centering the float 38 along the longitudinal axis
26 as the float 38 moves between the first and second positions, which aligns or centers the
float 38 relative to the first seat 22. Therefore, the bulge 45 can minimize transverse
movement of the float 38 relative to the longitudinal axis 26. In other words, the bulge 45
and the valve body 16 cooperate to minimize play in the float 38. It is to be appreciated that
the valve body 16 can include one or more fins 47 disposed in the first cavity portion 32 such
that the fins 47 are disposed between the inner surface of the valve body 16 and the float 38.
Therefore, the bulge 45 can selectively engage the valve body 16 or the fins 47 during
movement of the float 38 between the first and second positions. It is to be appreciated that
the bulge 45 and the fins 47 can be any suitable configuration.
[0023] The valve assembly 10 can further include a biasing member 46 engaging
the second end 44 of the float 38 to continuously bias the float 38 toward the first seat 22 or
the plate 36. In other words, the biasing member 46 applies the biasing force to the float 38
as discussed above. The biasing force overcomes the weight of the float 38 and frictional
forces between the float 38 engaging the fins 47 as the float 38 moves between the first and
second positions. The valve body 16 can include an end cap 49 that generally closes the first
cavity portion 32 and the biasing member 46 can engage the end cap 49. The end cap 49
remains stationary as the float 38 moves between the first and second positions. The end cap
49 generally contains the float 38 inside the first cavity portion 32 and provides a surface for
the biasing member 46 to react against. The end cap 49 is spaced from the first seat 22 and
can define an opening for an extension of the float 38 to be movable through the opening. It
is to be appreciated that in a vehicle roll-over situation, the float 38 will move to the second
position without the buoyancy of the float 38 affecting the float's position due to the biasing
force applied to the float 38 overcoming the buoyancy of the float 38, the weight of the float
38, and the frictional forces between the float 38 engaging the fins 47. Therefore, when in
the vehicle roll-over situation, the biasing member 46 assists in maintaining the float 38 in the
second position. In certain embodiments, the biasing member 46 can be a spring, such as a
coil spring. It is to be appreciated that the biasing member 46 can be any suitable
configuration to continuously bias the float 38 toward the first seat 22.
[0024] Optionally, as shown in Figures 3 and 4, the valve assembly 10 can include a
head valve 48 disposed in the second cavity portion 34. The head valve 48 can include a
second seat 50 opposing the first seat 22, with the second seat 50 extending outwardly from
the plate 36 into the second cavity portion 34. It is to be appreciated that the plate 36 and the
second seat 50 can be integrally formed to each other. In other words, the plate 36 and the
second seat 50 can be formed of one piece. Furthermore, it is to be appreciated that the plate
36, the first and second seats 22, 50 and the valve body 16 can be integrally formed to each
other or formed of one piece. It is to be appreciated that in a urea tank application, the head
valve 48 can be eliminated.
[0025] The head valve 48 can also include a blocking member 52 movably disposed
in the second seat 50 such that the blocking member 52 selectively closes the outlet 28.
Generally, the blocking member 52 rests in the second seat 50 to close the outlet 28 while the
float 38 is in the first position. The blocking member 52 moves away from the second seat
50 to open the outlet 28 when vapor pressure in the tank 12 exceeds a predetermined pressure
while the float 38 is in the first position. When the blocking member 52 moves away from
the second seat 50, vapors can vent through the outlet 28 into the vapor control structure 14.
For example, the blocking member 52 can move away from the second seat 50 to open the
outlet 28 during refueling when there is a large pressure differential between the tank 12 and
the second cavity portion 34. In certain embodiments, the blocking member 52 can be a ball
as shown in Figures 3 and 4. It is to be appreciated that the blocking member 52 can be any
suitable configuration. The head valve 48 can also be referred to as a pressure relief valve.
[0026] The second seat 50 can define a notch 53 (see Figure 4) adjacent to the outlet
28 to allow a small amount of fluid communication between the first and second cavity
portions 32, 34 when the blocking member 52 engages the outlet 28. In other words, when
the blocking member 52 engages the outlet 28, the notch 53 allows a small amount of vapor
to communicate between the first and second cavity portions 32, 34 such that small pressure
differentials between the first and second cavity portions 32, 34 can be equalized. Generally,
the notch 53 can be referred to as a bleed notch 53.
[0027] Referring to Figures 3, 4 and 6, the valve assembly 10 also includes a
support 54 coupled to the float 38. In certain embodiments, the support 54 is coupled to the
first end 42 of the float 38. The support 54 is movable with the float 38 between the first and
second positions. Furthermore, the support 54 is movable independently of the float 38 as
discussed further below. The support 54 can have a first side 56 and a second side 58
opposing the first side 56 which is also discussed further below.
[0028] In addition, continuing with Figures 3, 4 and 6, the valve assembly 10
includes a sealing member 60 attached to the support 54. It is to be appreciated that the
sealing member 60 and the support 54 can be separate components attached to one another or
integrally formed to each other such that the sealing member 60 and the support 54 are
formed of one-piece. The sealing member 60 has a base 62 abutting the support 54. In
certain embodiments, the base 62 abuts one of the first and second sides 56, 58 of the support
54. In one embodiment, the base 62 abuts the first side 56 of the support 54. The support 54
and the sealing member 60 cooperate to define a drum seal or a flapper. The drum seal 54,
60 provides improved opening and closing features of the outlet 28. For example, the drum
seal 54, 60 fully opens quickly when the float 38 moves from the second position back to the
first position to provide fully open fluid communication through the outlet 28. In other
words, the drum seal 54, 60 peels away from the first seat 22 crisply such that the sealing
member 60 does not flutter partially engaging the first seat 22 and thus partially covering the
outlet 28. Said differently, the drum seal 54, 60 pops off of the first seat 22 as the float 38
moves from the second position back to the first position.
[0029] The sealing member 60 also has an engagement portion 64 supported by the
base 62 to define a space 66 between the engagement portion 64 and the support 54 to allow
movement of the engagement portion 64 between an initial position when the float 38 is in
the first position and a displaced position when the float 38 is in the second position. More
specifically, the space 66 can be defined between the engagement portion 64 and one of the
first and second sides 56, 58 of the support 54 to allow movement of the engagement portion
64 between the initial position and the displaced position. Generally, the float 38 is in the
first position when the engagement portion 64 is spaced from the first seat 22 to allow fluid
communication through the outlet 28. The float 38 is in the second position when the
engagement portion 64 engages the first seat 22 such that the engagement portion 64 seals the
outlet 28 to minimize fluid communication through the outlet 28, and more specifically,
minimize fuel or vapor in the tank 12 from entering the vapor control structure 14.
Therefore, for example, when the float 38 is in the second position, the engagement portion
64 engages the first seat 22 such that the engagement portion 64 seals the outlet 28 to prevent
fuel or vapor in the tank 12 from entering the vapor control structure 14. The sealing member
60 closes the outlet 28 quickly and crisply such that the sealing member 60 does not flutter
partially engaging the first seat 22 and thus partially covering the outlet 28.
[0030] In various embodiments, as shown in Figures 4-6, the engagement portion
64 and the first side 56 of the support 54 define the space 66. Furthermore, in certain
embodiments, the base 62, the engagement portion 64 and the first side 56 of the support 54
further define the space 66 or pocket as best shown in Figure 6. Referring to Figure 4, the
engagement portion 64 is spaced from the first seat 22 when in the initial position to allow
fluid communication through the outlet 28. As shown in Figure 5, the engagement portion 64
engages the first seat 22 when in the displaced position such that the space 66 decreases in
size and the engagement portion 64 deforms about the first seat 22 to cover the outlet 28 and
minimize fluid communication through the outlet 28. Therefore, if the vehicle is
partially/fully rolled over, the float 38 can move to the second position and the engagement
portion 64 to the displaced position, and thus the engagement portion 64 will engage the first
seat 22 to seal the outlet 28, which minimizes fuel and vapor in the tank 12 from entering into
the vapor control structure 14. Furthermore, if the liquid fluid level 40 is relatively high in
the tank 12 and/or the vehicle is on a grade, the liquid fluid or fuel shifts in the tank 12 which
can also cause the float 38 to move to the second position and the engagement portion 64 to
the displaced position, and thus the engagement portion 64 will engage the first seat 22 to
seal the outlet 28, which minimizes fuel and vapor in the tank 12 from entering into the vapor
control structure 14. Liquid fluid or fuel could affect or saturate the vapor control structure
14 if the liquid fluid or fuel reaches the vapor control structure 14. Therefore, for example,
the engagement portion 64 and the first seat 22 cooperate to seal the outlet 28 when in the
displaced position to prevent liquid fluid or fuel in the tank 12 from entering the vapor
control structure 14.
[0031] More specifically, the engagement portion 64 engages the end face 30 of the
first seat 22 when in the displaced position. Therefore, when the engagement portion 64 is in
the displaced position, the engagement portion 64 covers the end face 30 of the first seat 22 to
minimize fluid communication through the outlet 28. Simply stated, the engagement portion
64 flexes or deforms about the first seat 22, and more specifically, flexes or deforms about
the end face 30 of the first seat 22, to cover the outlet 28 and minimize fuel and vapor in the
tank 12 from entering into the vapor control structure 14. Therefore, for example, the
engagement portion 64 can engage the end face 30 of the first seat 22 to prevent fuel and
vapor in the tank 12 from entering the vapor control structure 14. The engagement portion 64
can be deformed by the first seat 22 such that the engagement portion 64 remains spaced
from the support 54, and more specifically, spaced from the first side 56 of the support 54.
Alternatively, the engagement portion 64 can be deformed by the first seat 22 until the
engagement portion 64 engages the first side 56 of the support 54 such that the engagement
portion 64 is sandwiched between the end face 30 of the first seat 22 and the first side 56 of
the support 54.
[0032] At least a segment of the sealing member 60 can be formed of a flexible
material. In certain embodiments, the entire sealing member 60 is formed of the flexible
material. For example, the segment of the sealing member 60 can be the engagement portion
64. Therefore, the sealing member 60 or the engagement portion 64 can be formed of an
elastomer. One suitable elastomer is a fluorinated elastomer. In certain embodiments, the
elastomer is fiuorosilicone. It is to be appreciated that any other suitable flexible material can
be utilized.
[0033] As mentioned above, the sealing member 60 can be formed of flexible
material, therefore, the sealing member 60 or the engagement portion 64 is elastically
deformable or reversibly deformable. Said differently, the sealing member 60 or the
engagement portion 64 is resilient, and thus, after deformation, the sealing member
60/engagement portion 64 returns to its original configuration. Furthermore, the flexible
material for the base 62 can be thicker than the flexible material for the engagement portion
64 such that the engagement portion 64 deforms more readily than the base 62. Therefore,
when the engagement portion 64 is in the displaced position, the engagement portion 64 is
deformed, and when the engagement portion 64 is in the initial position, the engagement
portion 64 returns back to its original configuration. Thus, if the vehicle is partially/fully
rolled over, the float 38 can move to the second position and the engagement portion 64 to
the displaced position such that the engagement portion 64 deforms around the end face 30 of
the first seat 22 to seal the outlet 28, which minimizes fuel and vapor in the tank 12 from
entering into the vapor control structure 14. Furthermore, if the liquid fluid level 40 is
relatively high in the tank 12 and the vehicle is on the grade, the liquid fluid or fuel shifts in
the tank 12 which can also cause the float 38 to move to the second position and the
engagement portion 64 to the displaced position such that the engagement portion 64 deforms
around the end face 30 of the first seat 22 to seal the outlet 28, which minimizes fuel and
vapor in the tank 12 from entering into the vapor control structure 14. In addition, if the
vehicle is being driven such that the fuel is sloshing around in the tank 12, the engagement
portion 64 can engage the end face 30 of the first seat 22 to seal the outlet 28 to minimize fuel
in the tank 12 from entering the vapor control structure 14. As discussed above, liquid fluid
or fuel could affect or saturate the vapor control structure 14 if the liquid fluid or fuel reaches
the vapor control structure 14. Therefore, for example, the engagement portion 64 and the
end face 30 of the first seat 22 cooperate to seal the outlet 28 when in the displaced position
to prevent liquid fluid or fuel in the tank 12 from entering the vapor control structure 14.
[0034] Optionally, the engagement portion 64 can include a treated surface facing
the first seat 22 to selectively engage the end face 30 of the first seat 22. In other words, the
treated surface is disposed on the side of the engagement portion 64 that faces the end face 30
of first seat 22. The treated surface can assist in allowing the engagement portion 64 to peel
away from the first seat 22 when the sealing member 60 is moving to the initial position, and
more specifically, peel away from the end face 30 of the first seat 22. In other words, the
treated surface can assist in quickly peeling away the sealing member 60 from the first seat
22 such that the sealing member 60 does not flutter partially engaging the first seat 22. The
treated surface can be textured and/or have a coating applied thereon. For example, the
engagement portion 64 can be micro-machined to create the textured surface. The textured
surface can be ribs, knobs, moguls, etc. As another example, the engagement portion 64 can
be a low friction treated surface or a liquid-repellant treated surface.
[0035] Turning to Figure 6, the support 54 can define a first hole 68 through the
first and second sides 56, 58 such that the space 66 is in fluid communication with inside of
the valve body 16 to equalize pressure between the space 66 and inside of the valve body 16
when the engagement portion 64 moves between the initial and displaced positions. More
specifically, the first hole 68 equalizes pressure between the space 66 and the cavity 24, and
specifically equalizes pressure between the space 66 and the first cavity portion 32 of the
cavity 24. For example, when the engagement portion 64 engages the first seat 22, fluid
(gaseous and/or liquid fluid) is expelled out of the space 66 through the first hole 68 as the
space 66 decreases in size. When the engagement portion 64 disengages the first seat 22,
fluid enters the space 66 through the first hole 68 such that the engagement portion 64 returns
to its original configuration in the initial position.
[0036] Continuing with Figure 6, additionally, the support 54 can define a second
hole 70 through the first and second sides 56, 58 such that the space 66 is in fluid
communication with inside of the valve body 16 to equalize pressure between the space 66
and inside of the valve body 16 when the engagement portion 64 moves between the initial
and displaced positions. More specifically, the second hole 70 equalizes pressure between
the space 66 and the cavity 24, and specifically equalizes pressure between the space 66 and
the first cavity portion 32 of the cavity 24. Generally, the first and second holes 68, 70 are
spaced from each other. It is to be appreciated that any suitable number of holes 68, 70 can
be utilized for equalizing pressure between the space 66 and the cavity 24. Furthermore, in
addition to, or alternatively to having one or more holes 68, 70, the first side 56 of the support
54 can define one or more serrations, saw teeth, etc. along the base 62 of the sealing member
60 to equalize pressure between the space 66 and the cavity 24.
[0037] As shown in Figure 6, the base 62 of the sealing member 60 surrounds the
first and second holes 68, 70. Therefore, as indicated above, fluid communication between
the space 66 and the cavity 24 is provided through the first and/or second holes 68, 70. As
such, when the engagement portion 64 engages the first seat 22, fluid (gaseous and/or liquid
fluid) is expelled out of the space 66 through the first and/or second holes 68, 70 as the space
66 decreases in size. When the engagement portion 64 disengages the first seat 22, fluid
enters the space 66 through the first and/or second holes 68, 70 such that the engagement
portion 64 returns to its original configuration in the initial position. Simply stated, the first
and second holes 68, 70 provide bleed holes for the space 66.
[0038] Turning to Figures 3 and 6, generally, the support 54 can define a mounting
portion 72 to attach the sealing member 60 to the support 54. In certain embodiments, the
mounting portion 72 is further defined as plurality of mounting portions 72 cooperating with
the sealing member 60 to secure the sealing member 60 to the support 54. The mounting
portions 72 can be spaced from each other and can be any suitable configuration. For
example, as shown in Figures 3 and 6, each of the mounting portions 72 can define an
aperture 74 such that a plurality of parts of the sealing member 60 can be disposed through
respective apertures 74. Furthermore, the first and second holes 68, 70 are spaced from the
mounting portion 72, and more specifically, spaced from the mounting portions 72.
[0039] Continuing with Figures 3 and 6, the sealing member 60 can include
coupling members 76, such as feet, spaced from each other, with each of the coupling
members 76 disposed in respective apertures 74. Therefore, the parts as discussed above can
be defined as the coupling members 76/feet. The coupling members 76 can be deformed to
be inserted through the respective apertures 74. Therefore, when the sealing member 60 is
attached to the support 54, the base 62 surrounds the first and second holes 68, 70. It is to be
appreciated that the sealing member 60 can be attached to the support 54 by adhesive, overmolding,
fasteners such as hooks, staples, dovetails, snap-locks, etc., or any other suitable
method.
[0040] Referring to Figures 3 and 4, the float 38 can include an attachment member
78 extending outwardly from the first end 42. In certain embodiments, the attachment
member 78 is elongated and extends toward the plate 36 or the second cavity portion 34. It is
to be appreciated that the attachment member 78 can be any suitable configuration.
[0041] The attachment member 78 can include a stop 80 spaced from the first end
42, with the support 54 movable along the longitudinal axis 26 between the first end 42 and
the stop 80 independently of movement of the float 38 between the first and second positions.
The stop 80 limits the amount of movement of the support 54 along the longitudinal axis 26
while allowing the engagement portion 64 to peel away from the first seat 22 under certain
conditions. This independent movement allows the drum seal 54, 60 to quickly open and
close without fluttering as discussed above. One or more sections of the stop 80 can be flat,
arcuate, sloped or angled, etc. It is to be appreciated that the stop 80 can be any suitable
configuration.
[0042] The support 54 can include a coupler 82 (see Figures 3 and 4) engaging the
attachment member 78 to movably couple the support 54 to the float 38. The coupler 82 can
include a first finger 84 and a second finger 86 cooperating with each other to receive the
attachment member 78 therebetween. Specifically, the first and second fingers 84, 86 are
spaced from each other to define a gap 88 therebetween. The attachment member 78 is
disposed in the gap 88 between the fingers 84, 86 such that the coupler 82 couples the support
54 to the float 38. The first and second fingers 84, 86 can bias back and forth around the
attachment member 78 to attach or detach the support 54 from the attachment member 78.
Under certain conditions, the coupler 82 can selectively engage the stop 80. The coupler 82
can be any suitable configuration and can be coupled to the attachment member 78 differently
than discussed above. For example, the attachment member 78 can define a slot with the
coupler 82 including one or more posts, fingers, hooks, or protrusions disposed through the
slot to couple the support 54 to the attachment member 78.
[0043] The float 38 can further include a first column 90 and a second column 92,
with the attachment member 78 and the first and second columns 90, 92 spaced from each
other radially relative to the longitudinal axis 26. The support 54 can include a first leg 94
and a second leg 96 spaced from each other and each spaced from the coupler 82. The first
leg 94 can selectively engage the first column 90 and the second leg 96 can selectively
engage the second column 92 to limit rotational movement of the support 54 about the
longitudinal axis 26 to position the engagement portion 64 of the sealing member 60 relative
to the first seat 22. More specifically, the coupler 82 can engage the attachment member 78,
the first leg 94 can selectively engage the first column 90 and the second leg 96 can
selectively engage the second column 92 to limit rotational movement of the support 54 about
the longitudinal axis 26 to position the engagement portion 64 of the sealing member 60
relative to the first seat 22. The float 38, the first and second columns 90, 92, as well as the
attachment member 78 can be integrally formed to each other or formed of one piece.
Furthermore, the float 38, the first and second columns 90, 92 and the attachment member 78
can be formed of a plurality of pieces. It is to be appreciated that the first and second
columns 90, 92 and the attachment member 78 can be attached to the float 38 by any suitable
methods. Similarly, the support 54 and the first and second legs 94, 96 can be integrally
formed to each other or formed of one piece. It is to be appreciated that the first and second
legs 94, 96 can be attached to the support 54 by any suitable methods.
[0044] In certain embodiments, the float 38 can also include a ring 98 spaced from
the first end 42 of the float 38 and attached to at least one of the attachment member 78 and
the first and second columns 90, 92. Attached to at least one should be construed to include
non-exclusive logical "or", i.e., at least one of the attachment member 78 or the first column
90 or the second column 92 or combinations thereof. In one embodiment, as shown in Figure
3, the ring 98 is attached to the attachment member 78 and the first and second columns 90,
92. The ring 98 surrounds the first seat 22 when the float 38 is in the second position to assist
in aligning the float 38 along the longitudinal axis 26 and thus minimize movement of the
float 38 transverse to the longitudinal axis 26. In other words, the ring 98 and the first seat 22
cooperate to minimize play in the float 38.
[0045] Optionally, the first seat 22 can include at least one rib 100, and more
specifically can include a plurality of ribs 100 (see Figure 3), extending outwardly away from
the longitudinal axis 26. Generally, the ribs 100 further assist in aligning the float 38.
Therefore, the ring 98 surrounds the first seat 22 and the rib or ribs 100 when the float 38 is
in the second position to assist in aligning the float 38 along the longitudinal axis 26 and
minimize movement of the float 38 transverse to the longitudinal axis 26. The ring 98, the
attachment member 78 and the first and second columns 90, 92 can be integrally formed to
each other or formed of one piece. It is to be appreciated that the ring 98 can be attached to
the attachment member 78 and/or the first and second columns 90, 92 by any suitable
methods.
[0046] As best shown in Figure 3, the support 54 can include a tail 102 extending
outwardly away from the first and second fingers 84, 86 for assisting in balancing the support
54. In other words, the tail 102 generally counter-balances the coupler 82, and more
specifically, the tail 102, as well as the first and second legs 94, 96 generally counter-balance
the coupler 82. In certain embodiments, the tail 102 is disposed between the first and second
legs 94, 96 of the support 54. The tail 102 and the support 54 can be integrally formed to
each other or formed of one piece. It is to be appreciated that the tail 102 can be attached to
the support 54 by any suitable methods. It is to further be appreciated that the tail 102 can be
any suitable configuration and location.
[0047] Turning to Figures 3-6, in certain embodiments, the float 38 and the support
54 includes a centering mechanism 104 for centering the support 54 relative to the
longitudinal axis 26 to position the engagement portion 64 of the sealing member 60 relative
to the first seat 22. More specifically, the centering mechanism 104 acts as a gimbal to
position the engagement portion 64 of the sealing member 60 in a desired orientation relative
to the end face 30 of the first seat 22. For example, the support 54 gimbals relative to the
longitudinal axis 26 to substantially align the engagement portion 64 with the end face 30 of
the first seat 22 across the outlet 28. Therefore, when the engagement portion 64 engages the
end face 30, the outlet 28 is sealed by positioning or aligning the engagement portion 64.
Generally, the support 54 can gimbal at a relatively low force such that the sealing member
60 remains in the desired orientation relative to the end face 30. As such, the centering
mechanism 104 can position the engagement portion 64 to assist in tightly sealing the outlet
28 when the engagement portion 64 is in the displaced position. Gimballing of the support
54 can occur as the engagement portion 64 is proximal or close to engaging the end face 30
of the first seat 22. In certain embodiments, the support 54 can gimbal from about 5.0
degrees relative to the longitudinal axis 26. It is to be appreciated that the centering
mechanism 104 can be designed to allow greater than or less than 5.0 degrees of gimballing
relative to the longitudinal axis 26 when desired.
[0048] Additionally, the centering mechanism 104 can position the engagement
portion 64 of sealing member 60 relative to the first seat 22 such that movement of the
engagement portion 64 transverse to the longitudinal axis 26 is minimized when the
engagement portion 64 is in the displaced position. Simply stated, the centering mechanism
104 can minimize lateral movement of the engagement portion 64. Said differently, the
centering mechanism 104 can minimize sliding movement, i.e., side to side movement, of the
engagement portion 64 relative to the end face 30 of the first seat 22 when the engagement
portion 64 is in the displaced position. Minimizing sliding movement also minimizes liquid
fluid or fuel in the tank 12 from entering the vapor control structure 14 when the engagement
portion 64 is in the displaced position.
[0049] Continuing with Figures 3-6, in certain embodiments, the centering
mechanism 104 can include a cone 106 extending outwardly from one of the float 38 and the
support 54 to a distal end 108 coaxial with the longitudinal axis 26. Furthermore, in certain
embodiments, the centering mechanism 104 can define a conical aperture 110 extending into
the other one of the float 38 and the support 54 to a distal surface 112 coaxial with the
longitudinal axis 26. The cone 106 is disposed in the conical aperture 110 to define the
gimbal for centering the sealing member 60 relative to the longitudinal axis 26 to position the
engagement portion 64 relative to the first seat 22. Simply stated, the cone 106 and the
conical aperture 110 cooperate with each other. In certain embodiments, the outlet 28, the
distal end 108 of the cone 106 and the distal surface 112 are coaxial with the longitudinal axis
26. Aligning the distal end 108, the distal surface 112 and the outlet 28 coaxially can assist in
positioning the engagement portion 64, and thus, tightly sealing the outlet 28 when the
engagement portion 64 is in the displaced position. Additionally, aligning the distal end 108,
the distal surface 112 and the outlet 28 coaxially can lower the force that gimbals the support
54 relative to the longitudinal axis 26. Furthermore, the cone 106 and the conical aperture
110 cooperate to assist in minimizing sliding movement that also minimizes liquid fluid or
fuel in the tank 12 from entering the vapor control structure 14 when the engagement portion
64 is in the displaced position. Additionally, the distal surface 112, and thus the distal end
108, are disposed proximal to the engagement portion 64 along the longitudinal axis 26 to
minimize torque or angular force being applied to the centering mechanism 104 to allow the
support 54 to gimbal as desired. It is to be appreciated that the cone 106 and the conical
aperture 110 are shown spaced from each other in Figures 4 and 5 for illustrative purposes
only and one skilled in the art would recognize that the cone 106 will engage the support 54
in the conical aperture 110 when in the illustrated positions. It is to be appreciated that the
centering mechanism 104 can be other configurations than discussed above, for example, the
cone 106 could be configured as a pin, etc.
[0050] In one embodiment, as best shown in Figures 4 and 5, the float 38 includes
the cone 106 and the support 54 defines the conical aperture 110. Therefore, the cone 106
extends outwardly from the first end 42 of the float 38 and the conical aperture 110 extends
into the support 54. More specifically, the cone 106 extends outwardly from the first end 42
of the float 38 toward the second side 58 of the support 54 and the second side 58 of the
support 54 defines the conical aperture 110 extending toward the first side 56 away from the
float 38. The cone 106 and the float 38 can be integrally formed to each other or formed of
one piece. It is to be appreciated that the cone 106 can be attached to the first end 42 of the
float 38 by any suitable methods.
[0051] Turning to Figure 6, the support 54 can also include a reinforcing member
114 adjacent the conical aperture 110 to reinforce or strengthen the support 54 about the
conical aperture 110. In certain embodiments, the reinforcing member 114 is further defined
as a plurality of reinforcing members 114, with the reinforcing members 114 spaced from
each other radially about the longitudinal axis 26. Each of the reinforcing members 114 are
disposed adjacent the conical aperture 110 to reinforce or strengthen the support 54 about the
conical aperture 110. Generally, the reinforcing members 114 extend from the second side
58 of the support 54. The reinforcing members 114 and the support 54 can be integrally
formed to each other or formed of one piece. It is to be appreciated that the reinforcing
members 114 can be attached to the support 54 by any suitable methods.
[0052] Optionally, various internal components of the valve assembly 10 discussed
herein can be utilized in a valve body of another configuration. For example, the float 38
(with the attachment member 78, the columns 90, 92, a portion of the centering mechanism
104, etc.), the drum seal 54, 60, and/or the fins 47 can be designed to fit inside another valve
body. As another example, the plate 36 with the first seat 22 including one or more ribs 100,
and optionally the head valve 48, etc. can be designed to fit inside another valve body.
[0053] The reference numbers used in the drawings and the specification and the
corresponding components are as follows:
10 valve assembly
12 tank
13 bracket
14 vapor control structure
15 nipple
16 valve body
18 first portion
20 second portion
22 first seat
24 cavity
26 longitudinal axis
28 outlet
30 end face
32 first cavity portion
34 second cavity portion
36 plate
38 float
40 liquid fluid level
42 first end
44 second end
45 bulge
46 biasing member
47 frn(s)
48 head valve
49 end cap
50 second seat
52 blocking member
53 notch
54 support
56 first side
58 second side
60 sealing member
62 base
64 engagement portion
66 space
68 first hole
70 second hole
72 mounting portion
74 aperture
76 coupling members
78 attachment member
80 stop
82 coupler
84 first finger
86 second finger
88 gap
90 first column
92 second column
94 first leg
96 second leg
98 ring
100 rib(s)
102 tail
104 centering mechanism
106 cone
108 distal end
110 conical aperture
112 distal surface
114 reinforcing member
[0054] While the best modes for carrying out the many aspects of the present
teachings have been described in detail, those familiar with the art to which these teachings
relate will recognize various alternative aspects for practicing the present teachings that are
within the scope of the appended claims.

WE CLAIMS:-
1. A valve assembly (10) for a tank (12) of a vehicle, the assembly (10)
comprising:
a valve body (16) adapted to be attached to the tank (12), with the valve body (16)
including a seat (22) disposed inside the valve body (16), with the seat (22) defining an outlet
(28) for venting the tank (12);
a float (38) disposed inside the valve body (16) and movable between a first position
and a second position relative to the valve body (16) in response to a liquid fluid level (40)
inside the tank (12);
a support (54) coupled to the float (38) and movable with the float (38) between the
first and second positions; and
a sealing member (60) attached to the support (54) and having a base (62) abutting the
support (54), with the sealing member (60) having an engagement portion (64) supported by
the base (62) to define a space (66) between the engagement portion (64) and the support (54)
to allow movement of the engagement portion (64) between an initial position when the float
(38) is in the first position and a displaced position when the float (38) is in the second
position, with the engagement portion (64) spaced from the seat (22) when in the initial
position to allow fluid communication through the outlet (28), and with the engagement
portion (64) engaging the seat (22) when in the displaced position such that the space (66)
decreases in size and the engagement portion (64) deforms about the seat (22) to cover the
outlet (28) and minimize fluid communication through the outlet (28).
2. An assembly (10) as set forth in claim 1wherein the float (38) includes a first
end (42) and a second end (44) spaced from each other along a longitudinal axis (26), and
wherein the support (54) has a first side (56) and a second side (58) opposing the first side
(56), with the base (62) abutting one of the first and second sides (56, 58) of the support (54),
and wherein the base (62), the engagement portion (64) and the first side (56) of the support
(54) further define the space (66), with the support (54) defining a first hole (68) through the
first and second sides (56, 58) such that the space (66) is in fluid communication with inside
of the valve body (16) to equalize pressure between the space (66) and inside of the valve
body (16) when the engagement portion (64) moves between the initial and displaced
positions.
3. An assembly (10) as set forth in claim 2 wherein the support (54) defines a
second hole (70) through the first and second sides (56, 58) such that the space (66) is in fluid
communication with inside of the valve body (16) to equalize pressure between the space
(66) and inside of the valve body (16) when the engagement portion (64) moves between the
initial and displaced positions, with the first and second holes (68, 70) spaced from each
other.
4. An assembly (10) as set forth in claim 3 wherein the support (54) includes a
mounting portion (72) to attach the sealing member (60) to the support (54), with the first and
second holes (68, 70) spaced from the mounting portion (72).
5. An assembly (10) as set forth in claim 1wherein the float (38) includes an
attachment member (78) extending outwardly from the first end (42), and wherein the support
(54) includes a coupler (82) engaging the attachment member (78) to movably couple the
support (54) to the float (38).
6. An assembly (10) as set forth in claim 5 wherein the float (38) includes a first
column (90) and a second column (92), with the attachment member (78) and the first and
second columns (90, 92) spaced from each other radially relative to a longitudinal axis (26),
and wherein the support (54) includes a first leg (94) and a second leg (96) spaced from each
other and each spaced from the coupler (82), with the first leg (94) selectively engaging the
first column (90) and the second leg (96) selectively engaging the second column (92) to
limit rotational movement of the support (54) about the longitudinal axis (26) to position the
engagement portion (64) of the sealing member (60) relative to the seat (22).
7. An assembly (10) as set forth in claim 6 wherein the float (38) includes a first
end (42) and a second end (44) spaced from each other along the longitudinal axis (26), and
wherein the seat (22) includes at least one rib (100) extending outwardly away from the
longitudinal axis (26), with the float (38) including a ring (98) spaced from the first end (42)
of the float (38) and attached to at least one of the attachment member (78) and the first and
second columns (90, 92), and with the ring (98) surrounding the seat (22) and the rib (100)
when the float (38) is in the second position to assist in aligning the float (38) along the
longitudinal axis (26) and minimize movement of the float (38) transverse to the longitudinal
axis (26).
8. An assembly (10) as set forth in claim 1 wherein the float (38) and the support
(54) includes a centering mechanism (104) for centering the support (54) relative to a
longitudinal axis (26) to position the engagement portion (64) of the sealing member (60)
relative to the seat (22).
9. An assembly (10) as set forth in claim 8 wherein the centering mechanism
(104) includes a cone (106) extending outwardly from one of the float (38) and the support
(54) to a distal end (108) coaxial with the longitudinal axis (26).
10. An assembly (10) as set forth in claim 9 wherein the centering mechanism
(104) defines a conical aperture ( 110) extending into the other one of the float (38) and the
support (54) to a distal surface ( 112) coaxial with the longitudinal axis (26), with the cone
(106) disposed in the conical aperture ( 110) to define a gimbal for centering the sealing
member (60) relative to the longitudinal axis (26) to position the engagement portion (64)
relative to the seat (22).
11. An assembly (10) as set forth in claim 10 wherein the float (38) includes a first
end (42) and a second end (44) spaced from each other along the longitudinal axis (26), and
wherein the support (54) has a first side (56) and a second side (58) opposing the first side
(56), with the float (38) including the cone (106) and the support (54) defining the conical
aperture ( 110), and wherein the cone (106) extends outwardly from the first end (42) of the
float (38) toward the second side (58) of the support (54) and the second side (58) of the
support (54) defines the conical aperture ( 110) extending toward the first side (56) away from
the float (38).
12. A valve assembly (10) for a tank (12) of a vehicle, the assembly (10)
comprising:
a valve body (16) adapted to be attached to the tank (12), with the valve body (16)
including a seat (22) disposed inside the valve body (16), with the seat (22) defining an outlet
(28) for venting the tank (12);
a float (38) disposed inside the valve body (16) and movable between a first position
and a second position relative to the valve body (16) in response to a liquid fluid level (40)
inside the tank (12);
a support (54) coupled to the float (38) and movable with the float (38) between the
first and second positions; and
a sealing member (60) attached to the support (54) and having a base (62) abutting the
support (54), with the sealing member (60) having an engagement portion (64) supported by
the base (62) to define a space (66) between the engagement portion (64) and the support (54)
to allow movement of the engagement portion (64) between an initial position when the float
(38) is in the first position and a displaced position when the float (38) is in the second
position;
wherein the float (38) and the support (54) includes a centering mechanism (104) for
centering the support (54) relative to a longitudinal axis (26) to position the engagement
portion (64) of the sealing member (60) relative to the seat (22).
13. An assembly (10) as set forth in claim 12 wherein the centering mechanism
(104) includes a cone (106) extending outwardly from one of the float (38) and the support
(54) to a distal end (108) coaxial with the longitudinal axis (26).
14. An assembly (10) as set forth in claim 13 wherein the float (38) includes the
cone (106) and the centering mechanism (104) defines a conical aperture ( 110) extending into
the support (54) to a distal surface (112) coaxial with the longitudinal axis (26), with the cone
(106) disposed in the conical aperture ( 110) to define a gimbal for centering the sealing
member (60) relative to the longitudinal axis (26) to position the engagement portion (64)
relative to the seat (22).
15. An assembly (10) as set forth in claim 14 wherein the float includes a first end
(42) and a second end (44) spaced from each other along the longitudinal axis (26), and
wherein the support (54) has a first side (56) and a second side (58) opposing the first side
(56), and wherein the cone (106) extends outwardly from the first end (42) of the float (38)
toward the second side (58) of the support (54) and the second side (58) of the support (54)
defines the conical aperture ( 110) extending toward the first side (56) away from the float
(38).