JPH10169472A - Butterfly valve device - Google Patents

Butterfly valve device

Info

Publication number
JPH10169472A
JPH10169472A JP33356296A JP33356296A JPH10169472A JP H10169472 A JPH10169472 A JP H10169472A JP 33356296 A JP33356296 A JP 33356296A JP 33356296 A JP33356296 A JP 33356296A JP H10169472 A JPH10169472 A JP H10169472A
Authority
JP
Japan
Prior art keywords
seal ring
peripheral surface
inner peripheral
valve stem
outer peripheral
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
Application number
JP33356296A
Other languages
Japanese (ja)
Inventor
Hideaki Yaginuma
英朗 柳沼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Oozx Inc
Original Assignee
Fuji Oozx Inc
Fuji Valve Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Oozx Inc, Fuji Valve Co Ltd filed Critical Fuji Oozx Inc
Priority to JP33356296A priority Critical patent/JPH10169472A/en
Publication of JPH10169472A publication Critical patent/JPH10169472A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent inclination of a seal ring and suppress the leakage quantity of a fluid to a minimum by forming a small-diameter seal ring of a flange part orthogonal to a valve stem, and a cylindrical part connected inward to the inner peripheral edge of the flange part, and bringing the inner peripheral surface of the cylindrical part into close contact with the outer peripheral surface of the valve stem so as to be axially movable. SOLUTION: Small-diameter seal rings 16 respectively fitted to the outer periphery of a valve stem 4 on the passage 2 side and antipassage 2 side of a bush 7 are so formed that cylindrical parts 16b bent onto the passage 2 side are provided at the inner peripheral edges of flange parts 16a orthogonal to the valve stem 4 and that the inner peripheral surface of the cylindrical parts 16b are brought into close contact with the outer peripheral surface Of the valve stem 4 so as to be axially slidable. Since the cylindrical part 16b is thus formed at each seal ring 16 and brought into close contact with the valve stem 4, contact area with the valve stem 4 is enlarged, so that there is no risk of the seal ring 6 inclining, and the seal ring is smoothly movable in an axial direction. The flange 16a is also brought into close contact with a seal ring 11 and the side face of the bush 7 so as to prevent a clearance from being formed between them, thus ensuring sealing performance.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、例えば自動車の排
気ブレーキ用として、排気管に装着されるバタフライバ
ルブ装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve device mounted on an exhaust pipe, for example, for an automobile exhaust brake.

【0002】[0002]

【従来の技術】図3〜図5は、従来のバタフライバルブ
装置を示すもので、自動車の排気管(図示略)に取付け
られた概ね円筒形断面をなすボディ(1)内には、流路
(2)と直交する左右1対の弁軸(3)(4)により支持され
た弁体(5)が、回動自在として収容されている。
2. Description of the Related Art FIGS. 3 to 5 show a conventional butterfly valve device, in which a body (1) having a substantially cylindrical cross section attached to an exhaust pipe (not shown) of an automobile has a flow passage.
A valve body (5) supported by a pair of left and right valve shafts (3) and (4) orthogonal to (2) is rotatably housed.

【0003】両弁軸(3)(4)は、ボディ(1)における両
側壁の厚肉部(1a)の支持孔(6)に遊嵌されたブッシュ
(7)により回転自在に支承され、ボディ(1)を貫通する
右方の弁軸(4)の端部にボルト止めされた駆動レバー
(8)を回動することにより、弁体(5)は開閉させられ
る。
[0003] Both valve shafts (3) and (4) are bushes loosely fitted into support holes (6) of thick portions (1a) of both side walls of the body (1).
A drive lever rotatably supported by (7) and bolted to the end of the right valve shaft (4) passing through the body (1).
By rotating (8), the valve element (5) is opened and closed.

【0004】左方の支持孔(6)は、その側端部に圧入さ
れた閉塞部材(9)により密閉されている。右方の支持孔
(6)内を貫通している弁軸(4)には、ブッシュ(7)を挟
んで、内方の大小2個のシールリング(10)(11)と、外方
の小径の1個のシールリング(12)とが外嵌されている。
[0004] The left support hole (6) is sealed by a closing member (9) pressed into a side end thereof. Right support hole
(6) On the valve shaft (4) penetrating the inside, two large and small seal rings (10) and (11) on the inside and one small outside diameter on the bush (7) are sandwiched. The seal ring (12) is fitted outside.

【0005】内方の各シールリング(10)(11)は、図4に
拡大して示すように、支持孔(6)の内端に形成された小
径部(13)とブッシュ(7)との間の隙間内に、左右方向に
若干移動可能として収容されており、大径のシールリン
グ(10)は支持孔(6)の内周面に、また小径のシールリン
グ(11)は弁軸(4)の外周面に、それぞれ密接している。
[0005] Each of the inner seal rings (10) and (11) has a small diameter portion (13) formed at the inner end of a support hole (6) and a bush (7) as shown in an enlarged view in FIG. The large-diameter seal ring (10) is accommodated in the inner peripheral surface of the support hole (6), and the small-diameter seal ring (11) is accommodated in the valve shaft. The outer peripheral surface of (4) is in close contact with each other.

【0006】外方の小径のシールリング(12)は、弁軸
(4)の外周面と密接し、支持孔(6)の右側端に圧入され
たシール押え(14)により抜け止めされている。
The outer small-diameter seal ring (12) is
It is in close contact with the outer peripheral surface of (4) and is prevented from coming off by a seal retainer (14) pressed into the right end of the support hole (6).

【0007】支持孔(6)の開口端には、ブッシュ(7)の
抜け止め用の押え板(15)がボルト止めされている。
At the open end of the support hole (6), a holding plate (15) for retaining the bush (7) is bolted.

【0008】上記各シールリング(10)(11)(12)は、流路
(2)より流入してくる排気ガスが、弁軸(4)とブッシュ
(7)間の隙間を通して外部に漏出しようとするのを防止
する機能を有している。
Each of the seal rings (10), (11) and (12) is
(2) Exhaust gas flowing in from the valve shaft (4) and bush
(7) It has a function of preventing leakage to the outside through the gap between them.

【0009】[0009]

【発明が解決しようとする課題】上記従来のバタフライ
バルブ装置には、そのシール性に問題がある。すなわ
ち、図4に示すように、ブッシュ(7)は、通常、それ自
身やボディ(1)及び弁軸(4)の熱膨張を考慮して、支持
孔(6)及び弁軸(4)に対し若干の隙間(例えば支持孔に
対し0、08mm、弁軸に対し、0、01mm)を設けて嵌合
されている。
The above-mentioned conventional butterfly valve device has a problem in sealing performance. That is, as shown in FIG. 4, the bush (7) is usually provided in the support hole (6) and the valve shaft (4) in consideration of the thermal expansion of itself, the body (1) and the valve shaft (4). On the other hand, they are fitted with a slight gap (for example, 0,08 mm for the support hole and 0,01 mm for the valve shaft).

【0010】各シールリング(10)(11)(12)は、上記軸受
部に形成される隙間をシールするためのものであり、シ
ール効果を高めるためには、流路(2)よりの排圧が作用
した際、図4に示すように、各シールリング(10)(11)(1
2)とブッシュ(7)とが互いに密着することが肝要であ
る。
The seal rings (10), (11) and (12) are for sealing gaps formed in the bearing portion. To enhance the sealing effect, the seal rings (10), (11) and (12) are exhausted from the flow path (2). When pressure is applied, as shown in FIG. 4, each seal ring (10) (11) (1
It is important that the bush (7) and the bush (7) adhere to each other.

【0011】ところが、各シールリング(10)(11)(12)
は、平ワッシャ状を呈しており、弁軸(4)の外周面や支
持孔(6)の円周面に対しての接触面積が比較的小さいた
め、特に、排気ガスにさらされ易い流路(2)側の小径の
シールリング(11)は、内周面が偏摩耗したり、排気ガス
中のカーボン等が付着して摩擦抵抗が増大し易く、その
ため、図5に示すように、シールリング(11)が傾いて軸
方向に円滑に移動し得なくなることがある。このように
なると、大径のシールリング(10)との間に隙間が形成さ
れ、排気ガスが軸受部を通って外部に漏出し易くなる。
However, each seal ring (10) (11) (12)
Has a flat washer shape, and has a relatively small contact area with the outer peripheral surface of the valve shaft (4) and the peripheral surface of the support hole (6). The small-diameter seal ring (11) on the (2) side is apt to increase the frictional resistance due to uneven wear of the inner peripheral surface and the adhesion of carbon or the like in the exhaust gas. Therefore, as shown in FIG. In some cases, the ring (11) is inclined and cannot move smoothly in the axial direction. In this case, a gap is formed between the seal ring and the large-diameter seal ring, and the exhaust gas easily leaks to the outside through the bearing.

【0012】そのため、従来は、シールリング(11)を定
期的に交換したり、装置全体を分解して、付着している
カーボン等を除去するなどしており、その作業が面倒で
あった。
For this reason, conventionally, the seal ring (11) is periodically replaced, or the entire device is disassembled to remove the carbon and the like attached thereto, which is troublesome.

【0013】本発明は、上記課題に鑑みてなされたもの
で、シールリングの形状を改変することにより、それが
傾くのを防止し、かつ排気ガス等の流体の漏出量を最小
限に抑えうるようにしたバタフライバルブ装置を提供す
ることを目的としている。
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and by modifying the shape of a seal ring, it is possible to prevent the seal ring from tilting and to minimize the amount of leakage of fluid such as exhaust gas. It is an object of the present invention to provide a butterfly valve device as described above.

【0014】[0014]

【課題を解決するための手段】本発明によると、上記課
題は、次のようにして解決される。 (1)ボディの流路内に収容した弁体を、一端部がボデ
ィの両側壁における支持孔内に遊嵌した軸受部材を貫通
して外部に突出する弁軸により、回動可能に支持し、か
つ前記ボディを貫通する側の弁軸における少なくとも前
記軸受部材の流路側の内方に、内周面が弁軸の外周面と
密接する小径のシールリングと、外周面が前記支持孔の
内周面と密接する大径のシールリングとを、小径のシー
ルリングを内方に位置させて、軸方向に移動可能として
外嵌してなるバタフライバルブ装置において、前記小径
のシールリングを、弁軸と直交するフランジ部と、その
内周縁に内向きとして連設された円筒部とよりなるもの
とし、円筒部の内周面を、弁軸の外周面に軸方向に移動
可能として密接させる。
According to the present invention, the above-mentioned problem is solved as follows. (1) The valve body housed in the flow path of the body is rotatably supported by a valve shaft that has one end portion protruding outside through a bearing member loosely fitted in a support hole in both side walls of the body. And a seal ring having a small diameter whose inner peripheral surface is in close contact with the outer peripheral surface of the valve shaft, at least inwardly on the flow passage side of the bearing member in the valve shaft on the side penetrating the body; In a butterfly valve device in which a large-diameter seal ring that is in close contact with the peripheral surface and a small-diameter seal ring is positioned inward, and that is axially movable and externally fitted, the small-diameter seal ring is provided with a valve shaft. And a cylindrical portion connected to the inner peripheral edge of the cylindrical portion so as to face inward, and the inner peripheral surface of the cylindrical portion is closely attached to the outer peripheral surface of the valve shaft so as to be movable in the axial direction.

【0015】(2)上記(1)項において、大径のシール
リングの外周縁に、内方を向く円筒部を形成し、この円
筒部の外周面を、支持孔の内周面に密接させる。
(2) In the above item (1), a cylindrical portion facing inward is formed on the outer peripheral edge of the large-diameter seal ring, and the outer peripheral surface of the cylindrical portion is brought into close contact with the inner peripheral surface of the support hole. .

【0016】[0016]

【発明の実施の形態】以下、本発明の実施例を、図面に
基づいて説明する。なお、本発明は、前述した従来のバ
タフライバルブ装置を改変したものであるため、それと
同様の部材には同じ符号を付して、その詳細な説明を省
略するとともに、装置の要部のみを拡大して示す。
Embodiments of the present invention will be described below with reference to the drawings. Since the present invention is a modification of the above-described conventional butterfly valve device, the same members are denoted by the same reference numerals, detailed description thereof will be omitted, and only the main parts of the device will be enlarged. Shown.

【0017】図1は、本発明の第1実施例を示すもの
で、従来と同様のブッシュ(7)の流路(2)側において、
弁軸(4)に外嵌された小径のシールリング(16)は、弁軸
(4)と直交するフランジ部(16a)の内周縁に、流路(2)
側に折曲した円筒部(16b)を有してなり、円筒部(16b)の
内周面は、弁軸(4)の外周面に軸方向に摺動可能に密接
している。
FIG. 1 shows a first embodiment of the present invention, in which a bush (7) similar to the conventional one has a flow passage (2) side.
The small diameter seal ring (16) externally fitted to the valve shaft (4)
A flow path (2) is provided on the inner peripheral edge of the flange portion (16a) orthogonal to (4).
It has a cylindrical portion (16b) bent to the side, and the inner peripheral surface of the cylindrical portion (16b) is in close contact with the outer peripheral surface of the valve shaft (4) so as to be slidable in the axial direction.

【0018】ブッシュ(7)の外方の弁軸(4)に外嵌され
た小径のシールリング(16)も、上記と同じフランジ部(1
6a)と円筒部(16b)を有し、円筒部(16b)を外方に向けて
外嵌されている。なお、各フランジ部(16a)の外周面と
支持孔(6)の内周面との間には、従来同様、若干の隙間
が形成されている。
The small-diameter seal ring (16) externally fitted to the valve shaft (4) outside the bush (7) also has the same flange portion (1) as described above.
6a) and a cylindrical portion (16b), and are fitted with the cylindrical portion (16b) facing outward. Note that a slight gap is formed between the outer peripheral surface of each flange portion (16a) and the inner peripheral surface of the support hole (6) as in the related art.

【0019】このように、シールリング(16)に円筒部(1
6b)を形成して、これを弁軸(4)に密接させると、弁軸
(4)との接触面積が増大するので、従来のように、シー
ルリング(6)が傾く恐れはなく、軸方向に円滑に移動す
ることができる。
As described above, the cylindrical portion (1) is attached to the seal ring (16).
6b) is formed and brought into close contact with the valve shaft (4).
Since the area of contact with (4) increases, the seal ring (6) does not have a risk of tilting as in the prior art, and can move smoothly in the axial direction.

【0020】従って、各シールリング(16)のフランジ部
(16a)は、それぞれ大径のシールリング(11)及びブッシ
ュ(7)の側面と密着し、それらの間に隙間が形成される
のが防止されるため、排気ガスの外部への漏出は、極め
て小となる。
Therefore, the flange portion of each seal ring (16)
(16a) is in close contact with the side surfaces of the large-diameter seal ring (11) and the bush (7), respectively, and a gap is prevented from being formed therebetween. Extremely small.

【0021】図2は、本発明の第2実施例を示す。この
実施例においては、大径側のシールリング(17)の外周縁
に内向きの円筒部(17a)を形成し、この円筒部(17a)の外
周面を、支持孔(6)の内周面に軸方向に移動可能として
密接させてある。このようにすると、大径のシールリン
グ(17)の傾きも防止しうるので、シール性はより向上す
FIG. 2 shows a second embodiment of the present invention. In this embodiment, an inward cylindrical portion (17a) is formed on the outer peripheral edge of the large-diameter side seal ring (17), and the outer peripheral surface of the cylindrical portion (17a) is formed on the inner peripheral surface of the support hole (6). The surface is closely movable so that it can move in the axial direction. In this way, the inclination of the large-diameter seal ring (17) can be prevented, so that the sealing performance is further improved.

【0022】なお、上記実施例において、排気ガスの影
響を受けにくい最外方のシールリング(16)は、従来と同
様のフラットなシールリングとしてもよく、また、内方
の大小のシールリング(10)(16)、及び(16)(17)によるシ
ール効果が充分であれは、外方のシールリング(16)は省
略して実施することもある。
In the above embodiment, the outermost seal ring (16) which is hardly affected by the exhaust gas may be a flat seal ring similar to the conventional one, or the inner large and small seal rings (16). If the sealing effect of (10) (16) and (16) (17) is sufficient, the outer seal ring (16) may be omitted and practiced.

【0023】本発明は、上記排気ブレーキ用の外、他の
圧力流体の流路の開閉用としても適用しうるのは勿論で
ある。
The present invention can of course be applied not only for the above-mentioned exhaust brake but also for opening and closing the flow path of another pressure fluid.

【0024】[0024]

【発明の効果】本発明によれば、小径のシールリングの
傾きが防止されるので、軸方向に円滑に移動して、他の
シールリングや軸受部材と密着するようになり、排気ガ
ス等の流体の漏出量を最小限に抑えることができる。
According to the present invention, the inclination of the small-diameter seal ring is prevented, so that the small-diameter seal ring moves smoothly in the axial direction and comes into close contact with the other seal rings and bearing members, thereby reducing exhaust gas and the like. Fluid leakage can be minimized.

【0025】請求項2のようにすると、大径のシールリ
ングの傾きをも防止しうるので、シール効果はより向上
する。
According to the second aspect, the inclination of the large-diameter seal ring can be prevented, so that the sealing effect is further improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1実施例を示す要部の拡大横断平面
図である。
FIG. 1 is an enlarged cross-sectional plan view of a main part showing a first embodiment of the present invention.

【図2】同じく、第2実施例を示す要部の拡大横断平面
図である。
FIG. 2 is an enlarged cross-sectional plan view of a main part, similarly showing a second embodiment.

【図3】従来例を示す横断平面図である。FIG. 3 is a cross-sectional plan view showing a conventional example.

【図4】同じく、要部の拡大横断平面図である。FIG. 4 is also an enlarged cross-sectional plan view of a main part.

【図5】同じく、小径のシールリングが傾いた状態を示
す要部の拡大横断面図である。
FIG. 5 is an enlarged cross-sectional view of a main part showing a state in which a small-diameter seal ring is inclined.

【符号の説明】[Explanation of symbols]

(1)ボディ (1a)厚肉部 (2)流路 (3)(4)弁軸 (5)弁体 (6)支持孔 (7)ブッシュ(軸受部材) (8)駆動レバー (9)閉塞部材 (10)大径のシールリング (11)(12)小径のシールリング (13)小径部 (14)シール押え (15)押え板 (16)小径のシールリング (16a)フランジ部 (16b)円筒部 (17)大径のシールリング (17a)円筒部 (1) Body (1a) Thick part (2) Flow path (3) (4) Valve shaft (5) Valve body (6) Support hole (7) Bush (bearing member) (8) Drive lever (9) Closed (10) Large-diameter seal ring (11) (12) Small-diameter seal ring (13) Small-diameter part (14) Seal holder (15) Holding plate (16) Small-diameter seal ring (16a) Flange part (16b) Cylinder Part (17) Large diameter seal ring (17a) Cylindrical part

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ボディの流路内に収容した弁体を、一端
部がボディの両側壁における支持孔内に遊嵌した軸受部
材を貫通して外部に突出する弁軸により、回動可能に支
持し、かつ前記ボディを貫通する側の弁軸における少な
くとも前記軸受部材の流路側の内方に、内周面が弁軸の
外周面と密接する小径のシールリングと、外周面が前記
支持孔の内周面と密接する大径のシールリングとを、小
径のシールリングを内方に位置させて、軸方向に移動可
能として外嵌してなるバタフライバルブ装置において、 前記小径のシールリングを、弁軸と直交するフランジ部
と、その内周縁に内向きとして連設された円筒部とより
なるものとし、円筒部の内周面を、弁軸の外周面に軸方
向に移動可能として密接させたことを特徴とするバタフ
ライバルブ装置。
1. A valve body accommodated in a flow passage of a body is rotatable by a valve shaft having one end projecting outside through a bearing member loosely fitted into a support hole in both side walls of the body. A small-diameter seal ring whose inner peripheral surface is in close contact with the outer peripheral surface of the valve shaft, at least inward of the valve shaft on the side of the valve shaft that supports and penetrates the body, and the outer peripheral surface is the support hole. A large-diameter seal ring that is in close contact with the inner peripheral surface of the butterfly valve device that is fitted outside with the small-diameter seal ring positioned inward and movable in the axial direction. A flange portion perpendicular to the valve shaft and a cylindrical portion continuously provided inwardly at an inner peripheral edge thereof shall be formed, and an inner peripheral surface of the cylindrical portion is closely movable as an axially movable outer peripheral surface of the valve shaft. A butterfly valve device.
【請求項2】 大径のシールリングの外周縁に、内方を
向く円筒部を形成し、この円筒部の外周面を、支持孔の
内周面に密接させたことを特徴とする請求項1記載のバ
タフライバルブ装置。
2. A large-diameter seal ring, wherein an inwardly facing cylindrical portion is formed on an outer peripheral edge of the seal ring, and an outer peripheral surface of the cylindrical portion is closely contacted with an inner peripheral surface of the support hole. 2. The butterfly valve device according to 1.
JP33356296A 1996-12-13 1996-12-13 Butterfly valve device Pending JPH10169472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33356296A JPH10169472A (en) 1996-12-13 1996-12-13 Butterfly valve device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33356296A JPH10169472A (en) 1996-12-13 1996-12-13 Butterfly valve device

Publications (1)

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JPH10169472A true JPH10169472A (en) 1998-06-23

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Family Applications (1)

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JP33356296A Pending JPH10169472A (en) 1996-12-13 1996-12-13 Butterfly valve device

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006003017A1 (en) * 2004-07-07 2006-01-12 Faurecia Abgastechnik Gmbh Flap valve for a motor vehicle exhaust system
DE102012111948A1 (en) * 2012-12-07 2014-06-12 Pierburg Gmbh Valve device for an internal combustion engine
US9518514B2 (en) 2012-12-05 2016-12-13 Pierburg Gmbh Flap device for an internal combustion engine
JP2019203556A (en) * 2018-05-23 2019-11-28 株式会社ダイヤメット Sintered bearing
WO2022025170A1 (en) * 2020-07-31 2022-02-03 旭有機材株式会社 Butterfly valve
WO2022025171A1 (en) * 2020-07-31 2022-02-03 旭有機材株式会社 Butterfly valve

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006003017A1 (en) * 2004-07-07 2006-01-12 Faurecia Abgastechnik Gmbh Flap valve for a motor vehicle exhaust system
US9518514B2 (en) 2012-12-05 2016-12-13 Pierburg Gmbh Flap device for an internal combustion engine
DE102012111948A1 (en) * 2012-12-07 2014-06-12 Pierburg Gmbh Valve device for an internal combustion engine
DE102012111948B4 (en) * 2012-12-07 2015-05-28 Pierburg Gmbh Valve device for an internal combustion engine
CN105683531A (en) * 2012-12-07 2016-06-15 皮尔伯格有限责任公司 Flap device for an internal combustion engine
US9915208B2 (en) 2012-12-07 2018-03-13 Pierburg Gmbh Flap device for an internal combustion engine
JP2019203556A (en) * 2018-05-23 2019-11-28 株式会社ダイヤメット Sintered bearing
WO2019225210A1 (en) * 2018-05-23 2019-11-28 株式会社ダイヤメット Sintered bearing
CN112135980A (en) * 2018-05-23 2020-12-25 大冶美有限公司 Sintered bearing
US11353063B2 (en) 2018-05-23 2022-06-07 Diamet Corporation Sintered bearing
WO2022025170A1 (en) * 2020-07-31 2022-02-03 旭有機材株式会社 Butterfly valve
WO2022025171A1 (en) * 2020-07-31 2022-02-03 旭有機材株式会社 Butterfly valve

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