U.S. patent application number 16/827177 was filed with the patent office on 2020-12-10 for check valve.
The applicant listed for this patent is ZAMA JAPAN KABUSHIKI KAISHA. Invention is credited to Hideki Sasaki.
Application Number | 20200386191 16/827177 |
Document ID | / |
Family ID | 1000005046707 |
Filed Date | 2020-12-10 |
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United States Patent
Application |
20200386191 |
Kind Code |
A1 |
Sasaki; Hideki |
December 10, 2020 |
CHECK VALVE
Abstract
A check valve that can prevent sticking of a valve body and
reliably perform an opening and closing action in a check vale
having a simple structure and that does not use biasing means on
the valve body. A check valve has support pieces of a valve body
protruding in the valve body direction on a circular base seat
forming an outflow window in the center inserted in a circular
groove where a support member (retainer) is formed between an
outflow opening and a valve seat and on an open edge of the outflow
window formed in the center of the base seat, and the support
pieces of the support member (retainer) that support the valve body
have linear or planar support parts on the top portion for leveling
at least in a radial direction of the base seat.
Inventors: |
Sasaki; Hideki;
(Hachimantai, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ZAMA JAPAN KABUSHIKI KAISHA |
Iwate |
|
JP |
|
|
Family ID: |
1000005046707 |
Appl. No.: |
16/827177 |
Filed: |
March 23, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16058233 |
Aug 8, 2018 |
10634096 |
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16827177 |
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15655838 |
Jul 20, 2017 |
10072616 |
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16058233 |
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14803522 |
Jul 20, 2015 |
9739236 |
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15655838 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F02M 17/32 20130101;
F16K 27/0209 20130101; F02M 17/145 20130101; F16K 15/023
20130101 |
International
Class: |
F02M 17/14 20060101
F02M017/14; F16K 27/02 20060101 F16K027/02; F02M 17/32 20060101
F02M017/32; F16K 15/02 20060101 F16K015/02 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 7, 2014 |
JP |
2014-161420 |
Claims
1. A check valve comprising: a case body in which a cylindrically
shaped valve seat with a cylindrically shaped inflow opening and
outlet opening formed respectively on each end, having an inner
diameter larger than the inflow opening; a valve body disposed and
axially movable within the valve seat, the valve body having an
outer diameter slightly smaller than the inner diameter of the
valve seat; a support member disposed between the valve body and
the outflow opening of the valve seat, the support member
comprising a plurality of support pieces protruding toward the
valve body, each of the plurality of support pieces extending in a
non-radial direction of the support member.
2. The check valve of claim 1, wherein the support member and the
plurality of support pieces are one integrated piece.
3. The check valve of claim 1, wherein the plurality of support
pieces comprises a linear support area that extends beyond an outer
perimeter of the valve body.
4. The check valve of claim 3, wherein the valve body is in spaced
relation with a top surface of the valve seat and supported by the
linear support area of the plurality of support pieces in a level
orientation at least in a radial direction when the check valve is
in an open state.
5. The check valve of claim 1, wherein the valve body abuts a
topsurface of the valve seat when the check valve is in a closed
state.
6. The check valve of claim 1, wherein the plurality of support
pieces of the support member are positioned in spaced relation with
the inner diameter of the valve seat forming a gap there
between.
7. A carburetor comprising: a body; a fuel passage positioned
within the body; and a check valve positioned within the fuel
passage, the check valve comprising: a case body having an inflow
opening, an outflow opening larger than the inflow opening, a valve
seat positioned between the inflow and outflow opening, a valve
body larger than the inflow opening and movable between the valve
seat and a support member, wherein the support member removably
positioned between the valve seat and the outflow opening, and
wherein each of the plurality of support pieces extending in a
direction perpendicular to an axial direction of the support
member.
8. The carburetor of claim 7, where in the valve seat is
cylindrically shaped with cylindrically shaped inflow and outflow
openings formed at opposing ends respectively on each end of the
valve seat, the valve seat having an inner diameter larger than the
inflow opening and a predetermined length in an axial direction
formed between the inflow and outflow openings; and wherein the
valve body is having an outer diameter smaller than the inner
diameter of the valve seat, the valve body being movable in the
axial direction within the inner diameter of the valve seat;
wherein the plurality of support pieces are formed centrally on an
open edge of an outflow window formed in the center of the disk
shaped base seat; wherein each of the plurality of support pieces
has a linear support part on a top portion for linearly leveling
the valve body at least in a radial direction of the base seat.
9. The carburetor of claim 8, wherein the linear support part of
each of the plurality of support pieces of the support member
extends beyond an outer perimeter of the valve body.
10. The carburetor of claim 7, wherein the base seat and the
plurality of support pieces are integrally form from one piece
construction.
11. The carburetor of claim 7, wherein the support member comprises
a metal.
12. The carburetor of claim 7, wherein the support member comprises
a synthetic resin material.
13. The carburetor of claim 7, wherein the valve body is in spaced
relation with a top surface of the valve seat and supported on the
top portion of the plurality of support pieces in a level
orientation at least in a radial direction when the check valve is
in an open state.
14. The carburetor of claim 7, wherein the valve body abuts a
topsurface of the valve seat when the check valve is in a closed
state.
15. The carburetor of claim 7, wherein the plurality of support
pieces of the support member are positioned in spaced relation with
the inner diameter of the valve seat forming a gap there between.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 16/058,233, filed Aug. 8, 2018, which is a
continuation of U.S. patent application Ser. No. 15/655,838, filed
Jul. 20, 2017, now U.S. Pat. No. 10,072,616, which is a
continuation of U.S. patent application Ser. No. 14/803,522, filed
Jul. 20, 2015, now U.S. Pat. No. 9,739,236, both of which are
incorporated herein by reference in their entireties.
TECHNICAL FIELD
[0002] The present invention relates to a check valve used in a
fuel passage of a carburetor for the purpose of, for example,
preventing reverse flow of fuel.
BACKGROUND TECHNOLOGY
[0003] Check valves that allow fluid to flow out in only one
direction and prevent the reverse flow have been known in the past,
and various types such as a ball type, swing type, lift type, and
disk type according to the structure of a valve have been known. A
purpose of the check valve is to prevent the reverse flow of fluid,
and since overall the body is not complicated, such as the disk
type, it can be provided at a low cost, is easily installed in the
middle of a tubular body, and therefore it is suitable for
disposing, for example, in a fuel passage of a carburetor or the
like.
[0004] Further, a disk type check valve forms an inflow opening and
an outflow opening by a casing as described in, for example,
Japanese Unexamined Patent Application Nos. H10-288265 and
H07-101066, and a ring-shaped valve seat is formed there between to
dispose a disk-shaped valve body having a larger diameter than the
outflow opening and a smaller diameter than the valve seat, that is
biased in the outflow opening direction by a coil spring. When the
fluid flows in from the inflow opening at a pressure exceeding the
biasing force of the coil spring, the valve body slides in the
outflow opening direction by a large pressing force larger than the
biasing force of the coil spring acting on the valve body so that
the fluid that is coming in from the inflow opening through a gap
which is formed on the outer periphery of the valve body in the
valve seat, flows out. Conversely, when the fluid reverse flows
from the outflow opening direction, the valve body slides in the
inflow opening direction by the biasing force of the coil spring to
close the inflow opening so as to prevent the reverse flow of the
fluid.
[0005] A check valve using a further simple disk-shaped valve body
described in Japanese Unexamined Patent Application No. 2010-60110
has also been known. This check valve 330, as illustrated in FIG.
5A, is configured such that a valve body 332 and a valve seat 336
are inserted to attach in a valve holder 320, and assembled by
engaging a projecting part 324 to a groove 338 of the valve body
332. With this check valve 330, as illustrated in FIG. 5B, the
valve body 332 becomes an open state by abutting onto a valve
stopper 326 made from a curved longitudinal beam member, and also
becomes a close state by abutting the valve body 332 onto a valve
seat 336 by reverse direction pressure.
[0006] Therefore, there is a large difference in the check valves
described in Patent Application Nos. H10-288265 and H07-101066 in
that an advantageous effect is exhibited with a simple structure
without using means for pressing the valve body against the valve
seat, for example, such as a coil spring.
[0007] Furthermore, a check valve illustrated in FIGS. 6A, 6B and
6C is a conventionally known check valve having a further simpler
configuration than the check valve that exhibits the similar
advantageous effect with a simple structure without using biasing
means illustrated in FIGS. 5A and 5B. It is configured such that a
case body 1 made of, for example, aluminum die cast, with a
cylindrical inflow opening 2 and an outflow opening 3 formed
respectively in both ends, as well as a cylindrical valve seat 4,
having a predetermined length, is formed in the axial direction
between the inflow opening 2 and the outflow opening 3A disk-shaped
valve body 5 with an outer diameter having a slightly smaller
diameter than the inner diameter of the valve seat 4 as well as a
larger diameter than the inner diameter of the inflow opening 2, is
disposed with an ability to move in the axial direction of the
valve seat 4, and a support member (retainer) 6 for the valve body
5 that is disposed between the outflow opening 3 of the valve seat
4 and the valve body 5.
[0008] Moreover, the support member (retainer) 6 is configured as
illustrated in FIGS. 7, 8A, 8B and 8C where a disc-shaped base seat
61 that forms an outflow window 62 in the center is fit into a
circular circumferential groove formed between the outflow opening
3 and the valve seat 4 as illustrated in FIGS. 6A, 6B and 6C.
Support pieces 64 for the valve body 5 illustrated in FIGS. 6A, 6B
and 6C are provided in an upwardly projecting manner (the valve
body 5 direction) in an open edge 63 of the outlet window 62 formed
in the center of the base 61, as illustrated in FIGS. 7, 8A, 8B and
8C.
[0009] Also, in a check valve according to the present embodiment,
as illustrated in FIG. 6A, a predetermined gap 41 is formed between
the top surface 43 of the valve seat 4 and the valve body 5 because
the valve body 5 disposed in the valve seat 4 is pressed in the
outflow opening 3 direction by the fluid normally entering from the
inflow opening 2 to be supported by the support pieces 64 of the
support member (retainer) 6.
[0010] Accordingly, the fluid entered from the inflow opening 2
flows towards the outflow opening 3 from the inflow window 62 of
the support member (retainer) 6 via a space 42 formed between an
inner peripheral surface 44 of the valve seat 4 and the support
piece 64 from the gap 41.
[0011] When the flow of the fluid changes in this condition, in
other words, when the fluid that has been flowing toward the
outflow opening 3 flows in reverse and flows in the direction of
the inflow opening 2, the open end 21 of the inflow opening 2 is
closed by moving the valve body 5 in the axial direction within the
valve seat 4 because the fluid that has been flowing toward the
outflow opening 3 flows in reverse to operate the check valve. That
is, as illustrated in FIG. 6B, the valve body 5 tightly contacts
the open end 21 area of the inflow opening 2 of the valve seat 4
due to the fluid pressure of the reverse flow and the check valve
becomes the close state.
DOCUMENTS OF THE RELATED ART
[0012] Japanese Unexamined Patent Application No. H10-288265
[0013] Japanese Examined Patent Application No. H07-101066
[0014] Japanese Unexamined Patent Application No. 2010-60110
SUMMARY OF THE INVENTION
Problem to be Solved by the Invention
[0015] However, the conventionally known support member (retainer)
6 is, for example, machine pressed in a metal circular plate of an
appropriate thickness and formed with support pieces 64 for
supporting the center of the outflow window 62 and the valve body
5. Particularly, the tip ends of the support pieces 64 exhibit a
horseshoe shape by bending the side surface upward. As a result,
the support member (retainer 6) supports the valve body 5 in a
point contact state by respective tip ends of each support piece
64.
[0016] Accordingly, the valve body 5 is not supported by the
support member (retainer) 6 in a stable state, and a protruding
position of each support piece 64 on the support member (retainer)
6 is in a position separated from the inner circumferential surface
44 of the valve seat 4. Because there is a large range of play in
the valve body 5, when a fluid is applied to the valve body 5 at a
pressure biased, for example, in a direction toward the outflow
opening 3 with respect to the installation direction, the valve
body 5 will tilt to an angle where one end of the valve body 5 is
deeply inserted into a space 42 positioned between the inner
circumferential surface 44 of the valve seat 4 and each of the
support pieces 64 as shown in FIG. 6C. Therefore, the valve body 5
gets stuck due to the three (3) points of contact with the inner
circumferential surface 44 of the valve seat 4, each of the support
pieces 64, and the top portion 43 of the valve seat 4, and as a
result, there is a problem in that a state which inhibits the
opening and closing action of the check valve is induced.
[0017] To resolve the above problem, an object of the present
invention is to provide a check valve that can prevent sticking of
a valve body and reliably perform an opening and closing action of
a check valve having a simple structure and that does not use
biasing means on the valve body as conventionally known.
Means for Solving the Problem
[0018] To resolve the above problems, the present invention is a
check valve including: a case body in which a cylindrically shaped
valve seat with a cylindrically shaped inflow opening and outlet
opening formed respectively on each end and having an inner
diameter larger than the inflow opening, and having a predetermined
length in an axial direction formed between the inflow opening and
the outlet opening; a disk shaped valve body having an outer
diameter slightly smaller than the inner diameter of the valve seat
and disposed with the ability to move in an axial direction of the
valve seat by a larger diameter than the inner diameter of the
outflow opening; a support member (retainer) of the valve body
disposed between the valve body and the outlet opening of the valve
seat; and a plurality of support pieces of the support member
(retainer) protruded in the valve body direction on a disk shaped
base seat are formed centrally on an open edge of an outflow window
formed in the center of the base seat, where the support member
(retainer) is inserted in a circular groove formed between the
outflow opening and a valve seat; wherein each of the plurality of
support pieces of the support member (retainer) supporting the
valve body has a linear or planar support part on the top portion
for leveling of the base seat at least in a radial direction.
[0019] Because each support piece of a support member (retainer)
supporting a valve body has a linear or planar support part on the
top portion for leveling at least in a radial direction of the base
seat, the valve body, when in a released state, can be supported in
a stable state to prevent the generation of chattering, can narrow
the gap between the support part and the inner circumferential
surface of the valve seat to reduce the space formed between the
support piece, and can prevent sticking by the valve body by
reducing the range of play in the valve body.
[0020] Further, in the present invention, when integrally forming
the support member (retainer) from a plate member, each support
piece forms a linear support part on the top portion for leveling
the valve body at least in a radial direction of the base seat by
raising the support piece so as to face in a direction that
intersects a direction toward a center point instead of the method
of raising a support piece toward a center point used
conventionally.
Effect of the Invention
[0021] With the present invention, not only can a support member
(retainer) be formed from the same material and process as used
conventionally, but because the valve body can be prevented from
sticking, a check valve having higher reliability can be provided
in a simple structure similar to that used conventionally.
[0022] Moreover, in contrast to the support member (retainer) in
the conventional technique where contact with the valve body is in
point contact because the contact location with the valve body,
i.e. the protruding top portion, is a curved surface, the support
member (retainer) of the present invention includes a flat
protruding top portion as the contact location with the valve body,
and therefore, contact with the valve body is planar contact which
enables stability when holding the valve body.
[0023] Therefore, the valve body can move vertically while
remaining parallel to the valve seat, and in performing that
function, achieve an excellent effect not available
conventionally.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIGS. 1A, 1B and 1C illustrate vertical cross-sectional
views of a check valve according to a preferred embodiment of the
present invention.
[0025] FIG. 2 is a perspective view illustrating a support member
used in the embodiment illustrated in FIGS. 1A, 1B and 1C.
[0026] FIGS. 3A, 3B and 3C illustrate the support member shown in
FIG. 2, while FIG. 3A is a top view, FIG. 3B is a bottom view, and
FIG. 3C is a side view.
[0027] FIGS. 4A and 4B illustrate a different support member used
in the embodiment illustrated in FIGS. 1A, 1B and 1C, while FIG. 4A
is a top view and FIG. 4B is a vertical cross-sectional view.
[0028] FIGS. 5A and 5B are cross-sectional views of a state of use
of the check valve of the conventional technique described in
Japanese Unexamined Patent Application No. 2010-60110.
[0029] FIGS. 6A, 6B and 6C are vertical cross-sectional views
illustrating the conventional example.
[0030] FIG. 7 is a perspective view illustrating a support member
used in the conventional example illustrated in FIGS. 6A, 6B and
6C.
[0031] FIGS. 8A, 8B and 8C illustrate the support member shown in
FIG. 7, while FIG. 8A is a top view, FIG. 8B is a bottom view, and
FIG. 8C is a side view.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0032] Next, a preferred embodiment of the present invention will
be described with reference to drawings.
[0033] FIGS. 1A, 1B and 1C illustrate vertical cross-sectional
views of a preferred embodiment of a check valve which is the
present invention. The overall configuration is substantially
similar to that of the conventional technique shown in FIGS. 6A, 6B
and 6C and is configured in that an inflow opening 2 and an outflow
opening 3 are formed in a cylindrical shape on both ends,
respectively, and include: a case body 1 made of, for example, an
aluminum die cast forming a cylindrically shaped valve seat 4
having a predetermined length in an axial direction between the
inflow opening 2 and the outflow opening 3; a disk shaped valve
body 5 having an outer diameter slightly smaller than the inner
diameter of the valve seat 4 and disposed with the ability to move
in an axial direction of the valve seat 4 due to a larger diameter
than the inner diameter of the inflow opening 2; and a support
member (retainer) 6 for the valve body 5 disposed between the
outflow opening 3 of the valve seat 4 and the valve body 5.
[0034] Further, the support member (retainer) 6, as illustrated in
FIGS. 2, 3A, 3B and 3C, is provided with protruding support pieces
64 on the support member (retainer) 6 shown in FIGS. 1A, 1B and 1C
protruding upward (valve body 5 direction) standing (90.degree. in
this embodiment) at mutually equivalent angles from the center on a
circular plate shaped base seat 61 forming an outflow window 62 in
the center on an open edge 63 of the outflow window 62 formed in
the center of the base seat 61 and inserted in a circular groove
formed between the valve seat 4 and the outflow opening 3 of the
check valve shown in FIGS. 1A, 1B and 1C.
[0035] Further, with the support member (retainer) 6 as illustrated
in FIGS. 2, 3A, 3B and 3C, each support piece 64 of the support
member (retainer) 6 supporting the valve body 5 has a linear (or
planar) support part on the top portion for leveling the valve body
5 at least in a radial direction of the base seat 61.
[0036] Note that, the support member (retainer) 6 in this
embodiment, similar to the embodiment shown in FIGS. 7, 8A, 8B and
8C, has support pieces 64 to support the valve body 5, formed by
being cut out, on the open edge 63 of the outflow window 62 of the
circular base seat 61 having a fluid outflow window 62 with a
predetermined diameter in the center formed by, for example,
punching a metal plate such as brass or the like having an
appropriate thickness, and the support pieces 64 are erected by
bending in an intersecting direction with the base seat 61.
Particularly, because the support pieces 64 are raised in a
direction to intersect with a radial direction of the base seat 61
rather than in the radial direction, the support pieces 64 have a
linear (or planar) support part on the top portion for leveling the
valve body 5 at least in a radial direction of the base seat
61.
[0037] In this embodiment, using the support member (retainer) 6
configured in this manner, as shown in FIG. 1A, the valve body 5 is
supported by the support pieces 64 of the support member (retainer)
6 due to fluid flowing in from the inflow opening 2 pressing the
valve body 5 disposed in the valve seat 4 in a direction toward the
outflow opening 3. The fluid flowing out to the outflow opening 3
from the outflow window 62 of the support member (retainer) 6 via
the space 42 formed between the support pieces 64 and the inner
circumferential surface 44 of the valve seat 4 and from the gap 41
formed between the top surface 43 of the valve seat 4 and the valve
body 5.
[0038] At this time, in this embodiment, the support piece 64 of
the support member (retainer) 6 is in a shape that extends in the
radial direction of the base seat 61, and instead of point contact
against the valve body 5 as in the conventionally known check valve
shown in FIGS. 6A, 6B and 6C, the support piece 64 supports the
valve body 5 with at least a linear contact such that the valve
body 5 does not tilt or deflect and can move oscillating in the
valve seat 4 in an axial direction in an extremely stable
disposition reliably thereby preventing tilt and deflection by the
valve body 5.
[0039] Further, in this embodiment, as illustrated in FIG. 1B, when
fluid having flowed through the outflow opening 3 flows in reverse
toward the inflow opening 2, the check valve operates so that the
fluid having flowed toward the outflow opening 3 flows in reverse
through the valve seat 4 and moves the valve body 5 in an axial
direction in the valve seat 4 to block the open end 21 of the
inflow opening 2, placing the check valve in a closed state by the
valve body 5 tightly contacting the open end 21 area of the inflow
opening 2 of the valve seat 4 by the fluid pressure of the reverse
flowing fluid. Because the valve body 5 is supported by the support
member (retainer) 6 in a stable state prior to the reverse flow,
even if there is a reverse flow, the valve body 5 moves toward the
inflow opening 2 in a state still retaining a flat disposition.
[0040] Moreover, as illustrated in FIG. 1C, with this embodiment,
the space 42 formed between each support piece 64 of the support
member 6 and the inner circumferential surface 44 of the valve seat
4 is narrower than the conventionally known check valve shown in
FIGS. 6A, 6B and 6C, and therefore, the range of play in the valve
body 5 is reduced and sticking, as in the conventionally known
check valve, does not occur even if the valve body 5 tilts for some
reason while open.
[0041] In addition, FIGS. 4A and 4B illustrate a different
embodiment of the support member (retainer) 6 of the present
invention. In this embodiment, the entirety of the support member
(retainer) 6 is formed of, for example, an injection molding using
a hard synthetic resin material, and because this does not require
a step to machine fold the support piece 64, working is easier and
a more stable item can be provided. Particularly, it is possible to
form the support part of the support piece 64 flat with a wider
width than the thickness of the material in the previous example
embodiment to thereby employ a more stable support member
(retainer) 6.
[0042] In this manner, the support member (retainer) 6 used in the
embodiments is not limited in material or method of manufacture,
and as long as the support piece 64 erected on the base seat 61 is
formed in a linear or planar shape having a length in a radial
direction to the base seat 61, the effect can be demonstrated.
[0043] All features, elements, components, functions, and steps
described with respect to any embodiment provided herein are
intended to be freely combinable and substitutable with those from
any other embodiment. If a certain feature, element, component,
function, or step is described with respect to only one embodiment,
then it should be understood that that feature, element, component,
function, or step can be used with every other embodiment described
herein unless explicitly stated otherwise. This paragraph therefore
serves as antecedent basis and written support for the introduction
of claims, at any time, that combine features, elements,
components, functions, and steps from different embodiments, or
that substitute features, elements, components, functions, and
steps from one embodiment with those of another, even if the
following description does not explicitly state, in a particular
instance, that such combinations or substitutions are possible.
Express recitation of every possible combination and substitution
is overly burdensome, especially given that the permissibility of
each and every such combination and substitution will be readily
recognized by those of ordinary skill in the art upon reading this
description.
[0044] In many instances entities are described herein as being
coupled to other entities. It should be understood that the terms
"coupled" and "connected" (or any of their forms) are used
interchangeably herein and, in both cases, are generic to the
direct coupling of two entities (without any non-negligible (e.g.,
parasitic) intervening entities) and the indirect coupling of two
entities (with one or more non-negligible intervening entities).
Where entities are shown as being directly coupled together, or
described as coupled together without description of any
intervening entity, it should be understood that those entities can
be indirectly coupled together as well unless the context clearly
dictates otherwise.
[0045] While the embodiments are susceptible to various
modifications and alternative forms, specific examples thereof have
been shown in the drawings and are herein described in detail. It
should be understood, however, that these embodiments are not to be
limited to the particular form disclosed, but to the contrary,
these embodiments are to cover all modifications, equivalents, and
alternatives falling within the spirit of the disclosure.
Furthermore, any features, functions, steps, or elements of the
embodiments may be recited in or added to the claims, as well as
negative limitations that define the inventive scope of the claims
by features, functions, steps, or elements that are not within that
scope.
DESCRIPTION OF THE REFERENCE NUMERALS
[0046] 1 case body
[0047] 2 inflow opening
[0048] 3 outlet opening
[0049] 4 valve seat
[0050] 5 valve body
[0051] 6 support member (retainer)
[0052] 21 open end
[0053] 41 gap
[0054] 42 space
[0055] 43 top portion
[0056] 44 inner circumferential surface
[0057] 61 base seat
[0058] 62 outflow window
[0059] 63 open edge
[0060] 64 support piece
* * * * *