JPH10299922A - Check valve - Google Patents
Check valveInfo
- Publication number
- JPH10299922A JPH10299922A JP10333697A JP10333697A JPH10299922A JP H10299922 A JPH10299922 A JP H10299922A JP 10333697 A JP10333697 A JP 10333697A JP 10333697 A JP10333697 A JP 10333697A JP H10299922 A JPH10299922 A JP H10299922A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- umbrella
- passage
- check valve
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Check Valves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、流体圧（特に、気
体）を利用する圧力機器において、流体圧が規定以上に
上昇した場合に圧力を解放し、かつ外部からの塵等の進
入を防ぐために装備された、圧力解放口の開閉を行う逆
止弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure device utilizing a fluid pressure (particularly, gas), which releases the pressure when the fluid pressure rises more than a specified value and prevents entry of dust and the like from the outside. The present invention relates to a check valve that opens and closes a pressure release port, which is equipped to control the pressure.
【０００２】[0002]
【従来の技術】従来より、流体圧を利用する圧力機器に
おいて、このような逆止弁としては、例えば、適宜形状
の弁体を該弁体とは別体のバネによる付勢力で、圧力解
放口に形成した弁座に着座させる構成のものが種々知ら
れている。このような逆止弁は、弁体を付勢するバネの
収容保持のために、専用のハウジングが必要になった
り、あるいは圧力機器側に前記バネを設置するための加
工を行わなければならず、コストが嵩んでしまう。ま
た、構成部品が、弁体、ばね、ハウジング等と増えるた
め、組み付け等にも手間がかかっている。特に、それほ
ど高くない圧力の気体を扱う場合においては、簡易な構
成の弁が必要である。2. Description of the Related Art Heretofore, in a pressure device utilizing a fluid pressure, as such a check valve, for example, an appropriately shaped valve element is released by an urging force of a spring separate from the valve element. Various configurations are known that are seated on a valve seat formed in the mouth. Such a check valve requires a special housing for accommodating and holding a spring that biases the valve element, or a process for installing the spring on the pressure device side must be performed. However, the cost increases. In addition, since the number of components increases, such as a valve element, a spring, and a housing, it takes time to assemble the parts. In particular, a valve having a simple configuration is required when handling a gas having a not so high pressure.
【０００３】そこで、図６及び図７に示すような逆止弁
１が利用されている。この逆止弁１は圧力機器側の弁取
付孔２の周囲に開口した圧力解放口３を開閉するもので
ある。この逆止弁１は、上に凸の傘状の弁本体５と、該
弁本体５の内底部から垂設されて前記弁取付孔２に固定
支持される弁体連結部６とを、所定の弾性係数のゴム材
料により一体成形したものである。Therefore, a check valve 1 as shown in FIGS. 6 and 7 is used. The check valve 1 opens and closes a pressure release port 3 opened around a valve mounting hole 2 on the pressure device side. The check valve 1 includes an upwardly convex umbrella-shaped valve body 5 and a valve body connecting portion 6 which is vertically suspended from an inner bottom of the valve body 5 and fixedly supported by the valve mounting hole 2. Molded integrally with a rubber material having an elastic coefficient of
【０００４】前記弁体連結部６は、前記弁取付孔２に嵌
入可能な軸状部６ａの途中に、前記弁取付孔２の裏側の
縁部に引っかかって前記軸状部６ａの抜けを防止する突
起部６ｂを装備したものである。この突起部６ｂによ
り、図７に示すように、前記弁本体５は周縁部５ａが圧
力機器の圧力解放口３の周囲の壁面７に密着して、該弁
本体５により前記圧力解放口３の周囲が気密に覆われた
状態になる。[0004] The valve body connecting portion 6 is caught by an edge on the back side of the valve mounting hole 2 in the middle of the shaft portion 6 a that can be fitted into the valve mounting hole 2 and prevents the shaft portion 6 a from coming off. This is equipped with a protruding portion 6b. As shown in FIG. 7, the peripheral portion 5a of the valve body 5 comes into close contact with the wall surface 7 around the pressure release port 3 of the pressure device, and the valve body 5 forms the pressure release port 3 as shown in FIG. The surroundings are airtightly covered.
【０００５】一方、圧力解放口３から前記弁本体５の内
面に作用する圧力が規定以上になると、図７の破線で示
すように、前記弁本体５の周縁部５ａが弾性変形により
前記圧力解放口３の周囲の壁面７から離れて（めくれ上
がって）、圧力解放口３からの圧力放出を行う。On the other hand, when the pressure acting on the inner surface of the valve body 5 from the pressure release port 3 exceeds a specified level, the peripheral portion 5a of the valve body 5 is elastically deformed to release the pressure as shown by the broken line in FIG. The pressure is released from the pressure release port 3 away from the wall 7 around the port 3 (turning up).
【０００６】以上の逆止弁１は、構成部品が単一で済
み、また、圧力機器側にも、加工が単純な弁取付孔２を
設けるだけでよいため、コストの低減を図ることがで
き、また、組み付けの手間も軽減することができる。The above-described check valve 1 requires only a single component, and requires only a simple valve mounting hole 2 on the pressure device side, so that the cost can be reduced. In addition, the labor for assembling can be reduced.
【０００７】[0007]
【発明が解決しようとする課題】ところが、前述した逆
止弁１は、その材質上、特に圧力機器の壁面７が高温に
なるような場合、あるいは、弁を閉じた状態が長期間続
いたような場合に、周縁部５ａの表面が壁面７に張り付
き易く、その場合には、圧力解放口３から弁本体５内面
に作用する圧力が規定の圧力に達しても、前記周縁部５
ａが壁面７から離れず、本来の逆止弁としての役割が果
たせなくなる虞があった。However, the check valve 1 described above has a material, especially when the wall surface 7 of the pressure device becomes hot or when the valve is closed for a long time. In such a case, the surface of the peripheral portion 5a easily sticks to the wall surface 7. In this case, even if the pressure applied from the pressure release port 3 to the inner surface of the valve body 5 reaches a specified pressure, the peripheral portion 5a is
There is a possibility that a does not separate from the wall surface 7 and cannot function as an original check valve.
【０００８】そこで、本発明の目的は上記課題を解消す
ることにあり、張り付きにより作動圧に支障が生じるこ
とを防止でき、安価で、信頼性の高い逆止弁を提供する
ことである。Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide an inexpensive and highly reliable check valve which can prevent the operation pressure from being affected by sticking.
【０００９】[0009]
【課題を解決するための手段】上記目的に対し、本発明
の逆止弁は、圧力機器の隔壁に固定されている中央部
と、弾性材料から成り隔壁に設けた通路を塞ぐようにし
て周縁部が隔壁に係合しつつ前記中央部に保持された傘
状部とを備えた逆止弁であって、周縁部から中央部の方
向へ伸びる切れ目を傘状部に形成した構成としている。In order to solve the above-mentioned problems, a check valve according to the present invention comprises a central portion fixed to a partition of a pressure device and a peripheral portion made of an elastic material so as to close a passage provided in the partition. A check valve provided with an umbrella-shaped portion held at the central portion while the portion is engaged with the partition wall, wherein a cut extending from the peripheral edge toward the central portion is formed in the umbrella-shaped portion.
【００１０】そして、以上の構成によれば、何らかの理
由により、上記傘状部の周縁部が圧力機器の隔壁に張り
付いてしまっても、上記従来の安全弁に備えられている
ような圧力解放口に対応する上記通路から傘状部の内面
に作用する圧力が規定の圧力に達すれば、その圧力によ
る傘状部の弾性変形によって傘状部の周壁に形成した切
れ目が開いて、圧力の放出が始まる。そして、切れ目か
ら圧力の放出が行われている時に、切れ目の周辺に作用
する応力は、切れ目の端部である周縁部に集中して、張
り付きを剥がす力として有効に作用し、張り付きが弱い
時には、張り付きを解消することも可能になる。According to the above configuration, even if the rim of the umbrella-shaped portion sticks to the partition of the pressure device for some reason, the pressure release port as provided in the conventional safety valve is provided. When the pressure acting on the inner surface of the umbrella from the passage corresponding to reaches a predetermined pressure, the cut formed on the peripheral wall of the umbrella opens due to the elastic deformation of the umbrella caused by the pressure, and the pressure is released. Begin. When the pressure is released from the cut, the stress acting around the cut is concentrated on the peripheral edge, which is the end of the cut, and effectively acts as a force for peeling off the sticking. Also, it is possible to eliminate sticking.
【００１１】[0011]
【発明の実施の形態】以下、図示実施形態により、本発
明を説明する。図１乃至図５は本発明に係る逆止弁の一
実施形態を示したもので、図１は本発明の実施形態の逆
止弁１０の平面図、図２は図１のＢ−Ｂ線に沿う断面
図、図３は図１のＣ−Ｃ線に沿う断面図、図４及び図５
は一実施形態の逆止弁１０における圧力解放動作時の作
用説明図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. 1 to 5 show one embodiment of a check valve according to the present invention. FIG. 1 is a plan view of a check valve 10 according to an embodiment of the present invention, and FIG. 2 is a line BB in FIG. FIG. 3 is a sectional view taken along line CC of FIG. 1, FIG. 4 and FIG.
FIG. 4 is an explanatory diagram of an operation at the time of a pressure releasing operation in the check valve 10 of one embodiment.
【００１２】この一実施形態の逆止弁１０は、圧力機器
側の弁取付孔２の周囲に開口した通路３を開閉するもの
で、上に凸の傘状部５と、該傘状部５の内底部から垂設
されて弁取付孔２に固定支持される弁体連結部６とを所
定の弾性係数のゴム材料等により一体成形したものであ
る。The check valve 10 of this embodiment opens and closes a passage 3 opened around the valve mounting hole 2 on the pressure device side, and includes an upwardly convex umbrella-shaped portion 5 and an umbrella-shaped portion 5. And a valve body connecting portion 6 which is suspended from the inner bottom portion and fixedly supported in the valve mounting hole 2 by integral molding with a rubber material or the like having a predetermined elastic coefficient.
【００１３】弁体連結部６は、弁取付孔２に嵌入可能な
軸状部６ａの途中に、弁取付孔２の裏側の縁部に引っか
かって軸状部６ａの抜けを防止する突起部６ｂを装備し
たものである。突起部６ｂが弁取付孔２の裏側に正常に
引っかかった状態では、逆止弁１０は径方向の動きも制
限されて圧力機器側に固定支持された状態になる。そし
て、図２に示すように、傘状部５は周縁部５ａが圧力機
器の通路３の周囲の壁面７に密着して、該傘状部５によ
り通路３の周囲が気密に覆われた状態になる。The valve body connecting portion 6 has a protruding portion 6b which is hooked on the back edge of the valve mounting hole 2 in the middle of the shaft portion 6a which can be fitted into the valve mounting hole 2 to prevent the shaft portion 6a from coming off. It is equipped with. In a state where the projection 6b is normally hooked on the back side of the valve mounting hole 2, the check valve 10 is also restricted in radial movement and is fixedly supported on the pressure device side. As shown in FIG. 2, the umbrella-shaped portion 5 has a peripheral edge 5 a in close contact with a wall surface 7 around the passage 3 of the pressure device, and the umbrella-shaped portion 5 hermetically covers the periphery of the passage 3. become.
【００１４】そして、傘状部５の凸側が外部の大気に晒
されており、傘状部５の内側は圧力機器の弁装置制御で
高圧となる制御室に接続されている。そして、このよう
に圧力機器側に固定支持された逆止弁１０は、通路３か
ら傘状部５の内面に作用する圧力が規定内（この実施形
態の場合には大気圧）の時には、傘状部５の周縁部５ａ
が通路３の周囲の壁面７に密着して通路３を塞いだ状態
を保ち、そして、圧力機器の弁装置制御圧力が高圧とな
り、通路３から傘状部５の内面に作用する圧力が傘状部
５の耐えられる規定値以上の高圧となると、図２に破線
で示すように、傘状部５の周縁部５ａが弾性変形により
通路３の周囲の壁面７から離れて（めくれ上がって）、
通路３からの圧力放出を行うように、傘状部５の各部の
弾性強度が設定されている。The protruding side of the umbrella 5 is exposed to the outside atmosphere, and the inside of the umbrella 5 is connected to a control chamber which becomes high in pressure by controlling a valve device of a pressure device. When the pressure acting on the inner surface of the umbrella-shaped portion 5 from the passage 3 is within a specified range (atmospheric pressure in this embodiment), the check valve 10 fixedly supported on the pressure device side as described above is used. Peripheral part 5a of the shape part 5
Keeps the passage 3 in close contact with the wall 7 around the passage 3, and the valve device control pressure of the pressure device becomes high, and the pressure acting on the inner surface of the umbrella 5 from the passage 3 is umbrella-shaped. When the pressure becomes higher than the specified value that can withstand the portion 5, as shown by the broken line in FIG. 2, the peripheral portion 5a of the umbrella-shaped portion 5 separates from the wall surface 7 around the passage 3 by elastic deformation (turns up),
The elastic strength of each part of the umbrella-shaped part 5 is set so as to release the pressure from the passage 3.
【００１５】そして、この一実施形態の逆止弁１０で
は、図１（ａ）に示すように、傘状部５の周壁に、周縁
部５ａから母線方向に沿って延びる所定長の切れ目１２
が、設けられている。切れ目１２は、周方向に等間隔
で、４カ所に装備されている。即ち、この一実施形態の
場合、傘状部５の周縁部５ａは、切れ目１２により、４
つに分断されている。In the check valve 10 of this embodiment, as shown in FIG. 1A, a notch 12 having a predetermined length is formed on the peripheral wall of the umbrella-shaped portion 5 so as to extend from the peripheral portion 5a along the generatrix direction.
Are provided. The cuts 12 are provided at four locations at equal intervals in the circumferential direction. That is, in the case of this embodiment, the peripheral portion 5 a of the umbrella-shaped portion 5
It is divided into two.
【００１６】以上の切れ目１２は、図３に示すように、
傘状部５の周壁の肉厚方向に対して所定角度傾斜させた
状態で設けられている。このように、切れ目１２を、周
壁の肉厚方向に対して傾斜させたのは、通路３から傘状
部５の内面に作用する圧力が規定内の時には傘状部５の
壁部の弾性力によって閉じた状態を維持すると共に、通
路３から傘状部５の内面に作用する圧力が規定以上にな
ると傘状部５の壁部の弾性変形により開口が形成される
ようにするためである。As shown in FIG. 3,
The umbrella-shaped portion 5 is provided so as to be inclined at a predetermined angle with respect to the thickness direction of the peripheral wall. The reason why the slit 12 is inclined with respect to the thickness direction of the peripheral wall is that the elastic force of the wall of the umbrella-shaped portion 5 when the pressure acting on the inner surface of the umbrella-shaped portion 5 from the passage 3 is within a specified range. This is because the closed state is maintained, and when the pressure acting on the inner surface of the umbrella-shaped portion 5 from the passage 3 exceeds a prescribed value, an opening is formed by elastic deformation of the wall of the umbrella-shaped portion 5.
【００１７】以上の一実施形態の逆止弁１０によれば、
何らかの理由により、傘状部５の周縁部５ａの切れ目１
２が圧力機器の壁面に張り付いてしまっても、通路３か
ら傘状部５の内面に作用する圧力が規定の圧力に達すれ
ば、図４に示すように、その圧力による傘状部５の弾性
変形によって傘状部５の周壁に形成した切れ目１２が開
いて、圧力の放出が始まる。そして、切れ目１２から圧
力の放出が行われている時に、切れ目１２の周辺に作用
する応力は、切れ目１２の端部である周縁部５ａに集中
して、図５に示すように、張り付きを剥がす力として有
効に作用し、張り付きが弱い時には、張り付きを解消す
ることも可能になる。According to the check valve 10 of the above embodiment,
For some reason, the cut 1 of the peripheral portion 5a of the umbrella-shaped portion 5
Even if 2 adheres to the wall surface of the pressure device, if the pressure acting on the inner surface of the umbrella-shaped portion 5 from the passage 3 reaches a specified pressure, as shown in FIG. The cut 12 formed in the peripheral wall of the umbrella-shaped portion 5 is opened by the elastic deformation, and the release of pressure starts. When the pressure is released from the cut 12, the stress acting on the periphery of the cut 12 concentrates on the peripheral edge 5 a, which is the end of the cut 12, and peels off the sticking as shown in FIG. It works effectively as a force, and when sticking is weak, sticking can be eliminated.
【００１８】なお、前述の一実施形態において、傘状部
５は截頭円錐状としたが、滑らかな曲面による椀形、あ
るいは多角錐形等にすることも可能である。また、切れ
目１２の装備数も前述の一実施形態に限定するものでは
ない。装備する切れ目１２は、単一でもよく、また、２
以上の任意数に設定可能である。この切れ目１２は、図
１（ａ）のように母線方向へ沿った状態以外に、例え
ば、図１（ｂ）の切れ目１２ａに示すように、母線から
ずれて若干傾くように備えることもできる。In the above-described embodiment, the umbrella-shaped portion 5 has a truncated conical shape. However, the umbrella-shaped portion 5 may have a smooth curved surface such as a bowl shape or a polygonal pyramid shape. Also, the number of the cuts 12 is not limited to the above-described embodiment. The cut 12 to be equipped may be a single,
Any number above can be set. In addition to the state along the generatrix direction as shown in FIG. 1A, the cut 12 may be provided so as to be slightly deviated from the generatrix, for example, as shown by a gap 12a in FIG. 1B.
【００１９】[0019]
【発明の効果】本発明の逆止弁によれば、何らかの理由
により、傘状部の周縁部が圧力機器の壁面に張り付いて
しまっても、通路から傘状部の内面に作用する圧力が高
くなり、規定の圧力を越えた場合、例え周縁部が張り付
いていても、その圧力による傘状部の弾性変形によって
傘状部の周壁に形成した切れ目が開いて、圧力の放出が
始まる。そして、切れ目から圧力の放出が行われている
時に、切れ目の周辺に作用する応力は、切れ目の端部で
ある周縁部に集中して、張り付きを剥がす力として有効
に作用し、張り付きが弱い時には、張り付きを解消する
ことも可能になる。従って、傘状部の周縁部の張り付き
により作動圧に支障が生じることを防止でき、安価で、
信頼性の高い逆止弁を提供することができる。According to the check valve of the present invention, even if the peripheral portion of the umbrella sticks to the wall surface of the pressure device for some reason, the pressure acting on the inner surface of the umbrella from the passage is not affected. When the pressure rises and exceeds a specified pressure, even if the peripheral portion is stuck, the cut formed on the peripheral wall of the umbrella-shaped portion is opened by elastic deformation of the umbrella-shaped portion due to the pressure, and the pressure is released. When the pressure is released from the cut, the stress acting around the cut is concentrated on the peripheral edge, which is the end of the cut, and effectively acts as a force for peeling off the sticking. Also, it is possible to eliminate sticking. Therefore, it is possible to prevent the operating pressure from being affected by the sticking of the peripheral portion of the umbrella-shaped portion, and it is inexpensive.
A highly reliable check valve can be provided.
【図１】（ａ）本発明に係る逆止弁の切れ目の一実施形
態の平面図である。 （ｂ）本発明に係る逆止弁の切れ目の他の実施形態の平
面図である。FIG. 1 (a) is a plan view of an embodiment of a cut of a check valve according to the present invention. (B) It is a top view of other embodiment of the cut of the check valve which concerns on this invention.
【図２】図１（ａ）のＢ−Ｂ線に沿う断面図である。FIG. 2 is a cross-sectional view taken along the line BB of FIG.
【図３】図１（ａ）のＣ−Ｃ線に沿う断面図である。FIG. 3 is a sectional view taken along the line CC of FIG. 1 (a).
【図４】本発明の一実施形態における圧力解放動作時の
作用説明図である。FIG. 4 is an operation explanatory view at the time of a pressure release operation in one embodiment of the present invention.
【図５】本発明の一実施形態における圧力解放動作時の
作用説明図である。FIG. 5 is an operation explanatory view at the time of a pressure release operation in one embodiment of the present invention.
【図６】従来の逆止弁の平面図である。FIG. 6 is a plan view of a conventional check valve.
【図７】図６のＡ−Ａ線に沿う断面図である。FIG. 7 is a sectional view taken along the line AA of FIG. 6;
２ 弁取付孔 ３ 通路 ５ 傘状部 ５ａ 周縁部 ６ 弁体連結部 ７ 壁面 １０ 逆止弁 １２ 切れ目 2 Valve mounting hole 3 Passage 5 Umbrella 5a Peripheral edge 6 Valve body connection 7 Wall 10 Check valve 12 Cut
Claims (1)
部と、弾性材料から成り、隔壁７に設けた通路３を塞ぐ
ようにして周縁部が隔壁に係合しつつ前記中央部に保持
された傘状部とを備えた逆止弁において、 周縁部から中央部の方向へ伸びる切れ目を傘状部に形成
したことを特徴とする逆止弁。1. A central portion fixed to a partition wall 7 of a pressure device and made of an elastic material, and a peripheral portion is held at the central portion while engaging with the partition wall so as to close a passage 3 provided in the partition wall 7. A check valve provided with an umbrella-shaped part, wherein a cut extending from a peripheral part toward a central part is formed in the umbrella-shaped part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333697A JPH10299922A (en) | 1997-04-21 | 1997-04-21 | Check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333697A JPH10299922A (en) | 1997-04-21 | 1997-04-21 | Check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10299922A true JPH10299922A (en) | 1998-11-13 |
Family
ID=14351323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10333697A Pending JPH10299922A (en) | 1997-04-21 | 1997-04-21 | Check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10299922A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003021249A (en) * | 2001-07-06 | 2003-01-24 | Seiko Instruments Inc | Fluid control valve |
| KR100446793B1 (en) * | 2002-02-19 | 2004-09-07 | 주식회사 위닉스 | Hot-water counterflow preventing device |
| WO2007013337A1 (en) * | 2005-07-27 | 2007-02-01 | Taiyo Chemicals Co., Ltd. | Check valve, adopter, and compression bag |
| JP2010174994A (en) * | 2009-01-30 | 2010-08-12 | Kayaba Ind Co Ltd | Valve member |
| US8205640B2 (en) | 2009-02-24 | 2012-06-26 | Murata Manufacturing Co., Ltd. | Check valve, fluid device, and pump |
| WO2020158612A1 (en) * | 2019-01-29 | 2020-08-06 | 日東電工株式会社 | Ventilation component |
| USD931721S1 (en) | 2019-06-17 | 2021-09-28 | Custom Fabricating & Supplies | Vent plug |
| US11674610B2 (en) | 2019-06-17 | 2023-06-13 | Custom Fabricating & Supplies | Vent plug and method |
-
1997
- 1997-04-21 JP JP10333697A patent/JPH10299922A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003021249A (en) * | 2001-07-06 | 2003-01-24 | Seiko Instruments Inc | Fluid control valve |
| KR100446793B1 (en) * | 2002-02-19 | 2004-09-07 | 주식회사 위닉스 | Hot-water counterflow preventing device |
| WO2007013337A1 (en) * | 2005-07-27 | 2007-02-01 | Taiyo Chemicals Co., Ltd. | Check valve, adopter, and compression bag |
| JP2007032723A (en) * | 2005-07-27 | 2007-02-08 | Taiyo Kagaku Kk | Check valve, adapter and compression bag |
| JP2010174994A (en) * | 2009-01-30 | 2010-08-12 | Kayaba Ind Co Ltd | Valve member |
| US8205640B2 (en) | 2009-02-24 | 2012-06-26 | Murata Manufacturing Co., Ltd. | Check valve, fluid device, and pump |
| WO2020158612A1 (en) * | 2019-01-29 | 2020-08-06 | 日東電工株式会社 | Ventilation component |
| JPWO2020158612A1 (en) * | 2019-01-29 | 2021-12-02 | 日東電工株式会社 | Ventilation parts |
| US11739853B2 (en) | 2019-01-29 | 2023-08-29 | Nitto Denko Corporation | Ventilation component |
| USD931721S1 (en) | 2019-06-17 | 2021-09-28 | Custom Fabricating & Supplies | Vent plug |
| US11674610B2 (en) | 2019-06-17 | 2023-06-13 | Custom Fabricating & Supplies | Vent plug and method |
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