JP2001355744A - Metal seat butterfly valve - Google Patents
Metal seat butterfly valveInfo
- Publication number
- JP2001355744A JP2001355744A JP2000173618A JP2000173618A JP2001355744A JP 2001355744 A JP2001355744 A JP 2001355744A JP 2000173618 A JP2000173618 A JP 2000173618A JP 2000173618 A JP2000173618 A JP 2000173618A JP 2001355744 A JP2001355744 A JP 2001355744A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- sheet
- valve element
- surface pressure
- 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
- Lift Valve (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水道配管のような
流体輸送配管に介設して使用するのに好適なメタルシー
トバタフライ弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal sheet butterfly valve suitable for use in a fluid transport pipe such as a water pipe.
【０００２】[0002]
【従来の技術】メタルシートバタフライ弁は、図３、図
４および図５に示すように、弁体１が弁箱２の軸線Ｃ１
に直交する軸線Ｃ２を有する弁棒３に取付けられて、該
弁棒３とともにその軸まわりに回転可能に弁箱２に収容
され、弁体１の回転によって該弁体１の外周部に取付け
られているステンレス製の一方の弁体シート４Ａが弁箱
２の内面に取付けられているステンレス製の一方の弁箱
シート５Ａに接離し、弁体１の外周部に取付けられてい
るステンレス製の他方の弁体シート４Ｂが弁箱２の内面
に取付けられているステンレス製の他方の弁箱シート５
Ｂに接離しして開閉を行うように構成されている。な
お、弁箱１の内面は一様な内径の正円形を呈して軸線Ｃ
１方向にのびており、軸方向の両端部には、配管６，６
側のフランジ６Ａに結合可能なフランジ７，７を設けて
ある。2. Description of the Related Art As shown in FIGS. 3, 4 and 5, a metal sheet butterfly valve has an axial line C1 of a valve body 2 as shown in FIG.
Is mounted on the valve stem 3 having an axis C2 perpendicular to the shaft, is rotatably housed together with the valve stem 3 around its axis, and is attached to the outer peripheral portion of the valve body 1 by rotation of the valve body 1. The one stainless steel valve body sheet 4A comes in contact with and separates from the one stainless steel valve box sheet 5A attached to the inner surface of the valve box 2, and the other stainless steel valve attached to the outer periphery of the valve body 1. The other valve box sheet 5 made of stainless steel with the valve body sheet 4B of
It is configured to open and close by contacting with and separating from B. Note that the inner surface of the valve box 1 has a uniform circular shape with a uniform inner diameter, and has an axis C
It extends in one direction, and pipes 6, 6 are provided at both ends in the axial direction.
Flanges 7, 7 that can be connected to the side flange 6A are provided.
【０００３】このように構成されたメタルシートバタフ
ライ弁では、弁体１を図４の実線で示す弁閉位置から仮
想線で示す全開位置にかけて実線矢印方向に回転させる
と、弁体１の回転角の拡大に伴って弁箱２の内面と弁体
１の外周部の回転軌跡との間隔および弁体シート４Ａ，
４Ｂと弁箱シート５Ａ、５Ｂとの間隔が大きくなり、流
体（たとえば水）の通過断面積が拡大されて流量を増大
させることができる。また、仮想線で示す全開位置から
実線で示す弁閉位置にかけて破線矢印方向に回転させる
と、弁体１の回転角の縮小に伴って弁箱２の内面と弁体
１の外周部の回転軌跡との間隔および弁体シート４Ａ，
４Ｂと弁箱シート５Ａ、５Ｂとの間隔が小さくなり、流
体の通過断面積が縮小されて流量を減少させ、全閉位置
では流量を「０」にすることができる。したがって、弁
体１を回転角０゜の実線で示す弁閉位置に位置決めした
流量「０」の状態から、回転角９０゜の仮想線で示す全
開位置に位置決めした流量「最大」の範囲内で弁体の回
転角に応じて配管の通過流量を調整することができる。In the metal seat butterfly valve configured as described above, when the valve body 1 is rotated in the direction indicated by the solid line arrow from the valve closed position shown by the solid line in FIG. The distance between the inner surface of the valve box 2 and the rotation trajectory of the outer periphery of the valve body 1 and the valve body sheets 4A,
The distance between the valve 4B and the valve box sheets 5A, 5B is increased, and the passage cross-sectional area of the fluid (for example, water) is enlarged, so that the flow rate can be increased. When the valve is rotated in the direction indicated by a broken line from the fully open position indicated by the imaginary line to the valve closed position indicated by the solid line, the rotation trajectory of the inner surface of the valve box 2 and the outer peripheral portion of the valve element 1 is reduced as the rotation angle of the valve element 1 decreases. And the valve seat 4A,
The space between the valve seat 4B and the valve box seats 5A and 5B is reduced, the cross-sectional area of the fluid passage is reduced, and the flow rate is reduced. In the fully closed position, the flow rate can be set to “0”. Therefore, from the state of the flow rate “0” where the valve element 1 is positioned at the valve closing position indicated by the solid line of the rotation angle 0 °, within the range of the flow rate “maximum” positioned at the fully open position indicated by the virtual line of the rotation angle 90 °. The flow rate through the pipe can be adjusted according to the rotation angle of the valve body.
【０００４】前記構成のメタルシートバタフライ弁は、
一方の弁箱シート５Ａに一方の弁体シート４Ａが所定の
シール面圧で圧接し、かつ他方の弁箱シート５Ｂに他方
の弁体シート４Ｂが所定のシール面圧で圧接している全
閉時において、弁体１に流体圧Ｐ１が負荷されると、一
方の弁体シート４Ａ側では、弁体１を矢印Ｘ１で示す第
１方向に変形させようとする力が作用し、他方の弁体シ
ート４Ｂ側では、弁体１を矢印Ｘ２で示す第２方向に変
形させようとする力が作用する。[0004] The metal seat butterfly valve having the above structure is
Fully closed with one valve body sheet 4A pressed against one valve box sheet 5A at a predetermined sealing surface pressure, and the other valve body sheet 4B pressed against the other valve box sheet 5B at a predetermined sealing surface pressure. At this time, when the fluid pressure P1 is applied to the valve body 1, a force is applied to one of the valve body sheets 4A to deform the valve body 1 in the first direction indicated by the arrow X1, and the other valve is actuated. On the body sheet 4B side, a force acts to deform the valve body 1 in the second direction indicated by the arrow X2.
【０００５】[0005]
【発明が解決しようとする課題】ところで、一方の弁箱
シート５Ａと一方の弁体シート４Ａの圧接面および他方
の弁箱シート５Ｂと他方の弁体シート４Ｂの圧接面は、
一方側では弁体１の前記第１方向への変形によって面圧
が所定の値よりも小さくなる方向に傾斜し、他方側では
弁体１の前記第２方向への変形によって面圧が所定値よ
りも大きくなる方向に傾斜している。このため、弁体１
の全閉時に負荷される流体圧Ｐ１が設計値を超えた場合
に、弁体１に前記第１方向および第２方向の変形を生じ
ると、一方側では流体もれが発生し、他方側では面圧が
所定値よりも過剰に大きなって、弁体１を弁開方向に回
転させる弁開操作が困難になる。By the way, the pressure contact surface between one valve box sheet 5A and one valve body sheet 4A and the pressure contact surface between the other valve box sheet 5B and the other valve body sheet 4B are as follows.
On one side, the surface pressure inclines in a direction in which the surface pressure becomes smaller than a predetermined value due to the deformation of the valve body 1 in the first direction, and on the other side, the surface pressure becomes a predetermined value due to the deformation of the valve body 1 in the second direction. It is inclined in a direction that becomes larger than Therefore, the valve element 1
If the fluid pressure P1 applied when the valve is fully closed exceeds the design value, and the valve body 1 is deformed in the first direction and the second direction, fluid leakage occurs on one side and fluid leakage occurs on the other side. When the surface pressure is excessively larger than a predetermined value, it becomes difficult to open the valve to rotate the valve body 1 in the valve opening direction.
【０００６】そこで、本発明は、弁体の全閉時に該弁体
に設計値を超える流体圧が負荷されることで、弁体が変
形しても、面圧の低下による流体もれの発生および面圧
の過剰な上昇による弁開操作の困難を確実に解消するこ
とができるメタルシートバタフライ弁を提供することを
目的としている。Accordingly, the present invention is directed to a method for producing a fluid leak due to a decrease in surface pressure even when the valve is deformed by applying a fluid pressure exceeding a design value to the valve when the valve is fully closed. It is another object of the present invention to provide a metal seat butterfly valve capable of reliably resolving a difficulty in opening a valve due to an excessive rise in surface pressure.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
に、本発明に係るメタルシートバタフライ弁は、弁体が
弁箱の軸線に交差する軸線を有する弁棒に取付けられ、
弁棒とともにその軸まわりに回転可能に弁箱に収容さ
れ、その回転によって弁体外周部の円周方向に分割され
た弁体シートが弁箱内面の円周方向に分割された弁箱シ
ートに接離して開閉を行うとともに、前記弁体の全閉時
に負荷される流体圧により該弁体が変形した時に、弁体
シートと弁箱シートとのシール面圧が低下する部分と前
記シール面圧が所定値よりも高くなる部分が同時に発生
するメタルシートバタフライ弁において、前記シール面
圧が低下する側の弁箱シートは、弾性復帰によって弁体
シートに圧接して該弁体シートとの面圧低下を回避し、
前記シール面圧が所定値よりも高くなる側の弁箱シート
は、弾性変形により弁体シートに圧接して該弁体シート
との面圧上昇を回避できるように構成されていることを
特徴としている。In order to achieve the above object, a metal seat butterfly valve according to the present invention is mounted on a valve stem having a valve body having an axis crossing an axis of a valve box,
The valve body seat is rotatably housed in the valve box together with the valve stem around its axis, and the rotation causes the valve body sheet divided in the circumferential direction on the outer peripheral portion of the valve body to become the valve box sheet divided in the circumferential direction on the inner surface of the valve box. A portion in which the sealing surface pressure between the valve body sheet and the valve box sheet is reduced when the valve body is deformed by the fluid pressure applied when the valve body is fully closed, and the sealing surface pressure In the metal sheet butterfly valve in which a portion where the pressure is higher than a predetermined value is simultaneously generated, the valve box sheet on the side where the sealing surface pressure is reduced is brought into pressure contact with the valve body sheet by elastic return and the surface pressure with the valve body sheet is reduced. Avoid drop,
The valve box sheet on the side where the sealing surface pressure is higher than a predetermined value is configured so as to be brought into pressure contact with the valve body sheet by elastic deformation so as to avoid an increase in surface pressure with the valve body sheet. I have.
【０００８】本発明によれば、弁体の全閉時に該弁体に
設計値を超える流体圧が負荷されることで弁体に変形が
生じても、この変形によって、弁体シートとのシール面
圧が低下する側の弁箱シートは、弾性復帰して弁体シー
トに圧接して該弁体シートとの面圧低下を回避するよう
に作用するので、ここからの流体もれの発生を確実に防
止することができる。また、弁体シートとのシール面圧
が所定値よりも高くなる側の弁箱シートは、弾性変形に
より弁体シートに圧接して該弁体シートとの面圧上昇を
回避するように作用するので、弁体を弁開方向に回転さ
せる弁開操作が容易になる。According to the present invention, even when the valve body is deformed due to a fluid pressure exceeding the design value being applied to the valve body when the valve body is fully closed, the deformation causes the seal with the valve seat. The valve box sheet on the side where the surface pressure is reduced resiliently recovers and presses against the valve body sheet to act to avoid a decrease in the surface pressure with the valve body sheet. It can be reliably prevented. In addition, the valve box sheet on the side where the sealing surface pressure with the valve body sheet is higher than a predetermined value is pressed against the valve body sheet by elastic deformation and acts so as to avoid an increase in the surface pressure with the valve body sheet. Therefore, the valve opening operation of rotating the valve body in the valve opening direction is facilitated.
【０００９】[0009]
【発明の実施の形態】以下、本発明の一実施の形態を図
面に基づいて説明する。図１は本発明に係るメタルシー
トバタフライ弁の一実施の形態を示す横断平面図、図２
は要部の拡大断面図である。なお、図３、図４および図
５の従来例と同一もしくは相当部分には同一符号を付し
て重複した説明は省略する。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional plan view showing an embodiment of a metal sheet butterfly valve according to the present invention, and FIG.
Is an enlarged sectional view of a main part. The same or corresponding parts as those in the conventional example of FIGS. 3, 4 and 5 are denoted by the same reference numerals, and redundant description will be omitted.
【００１０】図１および図２において、ステンレス製の
一方の弁箱シート５Ａは、基部５０と弾性片５１とを備
えた横断面形状がフック状のもので、弁箱２の内面に形
成した凹部８に嵌め込んだ状態で、複数のボルト９（た
だし、図２には、１本のボルト９のみが示されている）
によって基部５０を凹部８の奥面に着脱可能に締結する
ことによって弁箱２に取付けられている。前記弾性片５
１は、基部５０における流体圧Ｐ１の負荷方向下流側の
端部に連設されて流体圧Ｐ１の負荷方向上流側にのびて
おり、その内面５２は、前記負荷方向下流側の端部から
負荷方向上流側の端部にかけて弁箱２の半径方向内側へ
の突出が漸次増大する傾斜面になっている。また、弾性
片５１は、一方の弁体シート４Ａが離間している弁体１
の弁開状態では、二点鎖線で示すように、弁箱２の半径
方向内側に少し突出した自然状態に保持されている。In FIG. 1 and FIG. 2, one stainless steel valve box sheet 5A has a hook-like cross section having a base 50 and an elastic piece 51, and a recess formed in the inner surface of the valve box 2. 8 and a plurality of bolts 9 (only one bolt 9 is shown in FIG. 2).
The base 50 is attached to the valve box 2 by detachably fastening the base 50 to the inner surface of the recess 8. The elastic piece 5
1 is connected to an end of the base 50 on the downstream side in the load direction of the fluid pressure P1 and extends to the upstream side in the load direction of the fluid pressure P1. The radially inward projection of the valve box 2 gradually increases toward the upstream end. In addition, the elastic piece 51 is provided on the valve body 1 on which one of the valve body sheets 4A is separated.
In the valve open state, as shown by a two-dot chain line, the valve case 2 is held in a natural state slightly protruding inward in the radial direction.
【００１１】ステンレス製の他方の弁箱シート５Ｂは、
基部５３と弾性片５４とを備えた横断面形状がフック状
のもので、弁箱２の内面に形成した凹部１０に嵌め込ん
だ状態で、複数のボルト１１（ただし、図２には、１本
のボルト１１のみが示されている）によって基部５３を
凹部１０の奥面に着脱可能に締結することによって弁箱
２に取付けられている。前記弾性片５４は、基部５３に
おける流体圧Ｐ１の負荷方向上流側の端部に連設されて
流体圧Ｐ１の負荷方向下流側にのびており、その内面５
５は、前記負荷方向上流側の端部から負荷方向下流側の
端部にかけて弁箱２の半径方向内側への突出が漸次増大
する傾斜面になっている。また、弾性片５４は、他方の
弁体シート４Ｂが離間している弁体１の弁開状態では、
二点鎖線で示すように、弁箱２の半径方向内側に少し突
出した自然状態に保持されている。The other stainless steel valve box sheet 5B is
The cross-sectional shape having the base 53 and the elastic piece 54 is a hook shape, and a plurality of bolts 11 (in FIG. Only the bolts 11 are shown), and the base 53 is detachably fastened to the inner surface of the recess 10 so as to be attached to the valve box 2. The elastic piece 54 is connected to an end of the base 53 on the upstream side in the load direction of the fluid pressure P1 and extends downstream in the load direction of the fluid pressure P1.
Reference numeral 5 denotes an inclined surface whose radially inward projection of the valve box 2 gradually increases from the upstream end in the load direction to the downstream end in the load direction. In addition, the elastic piece 54 is in a valve-open state of the valve body 1 in which the other valve body sheet 4B is separated.
As shown by the two-dot chain line, the valve case 2 is held in a natural state slightly protruding inward in the radial direction.
【００１２】前記構成において、一方の弁箱シート５Ａ
の弾性片５１に一方の弁体シート４Ａが所定のシール面
圧で圧接し、かつ他方の弁箱シート５Ｂの弾性片５４に
他方の弁体シート４Ｂが所定のシール面圧で圧接してい
る全閉時において、弾性片５１、５４は、弁箱シート５
Ａ、５Ｂに押圧されて実線で示すように弁箱２の半径方
向外側に弾性変形して少し撓んだ状態を呈している。In the above configuration, one valve box sheet 5A
The one valve body sheet 4A is pressed against the elastic piece 51 with a predetermined sealing surface pressure, and the other valve body sheet 4B is pressed against the elastic piece 54 of the other valve box sheet 5B with a predetermined sealing surface pressure. When fully closed, the elastic pieces 51, 54
As shown by the solid line when pressed by A and 5B, the valve case 2 is elastically deformed outward in the radial direction and slightly bent.
【００１３】この状態で弁体１に流体圧Ｐ１が負荷され
ると、一方の弁体シート４Ａ側では、弁体１を矢印Ｘ１
で示す第１方向に変形させようとする力が作用し、他方
の弁体シート４Ｂ側では、弁体１を矢印Ｘ２で示す第２
方向に変形させようとする力が作用する。When the fluid pressure P1 is applied to the valve body 1 in this state, the valve body 1 is moved toward the arrow X1 on one of the valve body sheets 4A.
A force to deform in the first direction shown by the arrow acts on the other valve body sheet 4B side, and the valve body 1 is moved to the second direction shown by the arrow X2.
A force to deform in the direction acts.
【００１４】一方の弁箱シート５Ａの弾性片５１の内面
５２は、弁体１の前記第１方向への変形によって面圧が
所定の値よりも小さくなる方向に傾斜し、また、他方の
弁箱シート５Ｂの弾性片５４の内面５５は、前記第２方
向への変形によって面圧が所定値よりも大きくなる方向
に傾斜している。しかし、弁体１の全閉時に負荷される
流体圧Ｐ１が設計値を超えることで、弁体１に前記第１
方向の変形が生じても、一方の弁箱シート５Ａにおける
弾性片５１が実線で示す状態から二点鎖線で示す状態に
向けて弾性復帰して一方の弁体シート４Ａに圧接し、該
一方の弁体シート４Ａとの面圧低下を回避するように作
用するので、ここからの流体もれの発生を確実に防止す
ることができる。また、一方の弁体シート４Ａとの面圧
低下を回避させる作用は、矢印郡ｐで示すように、弾性
片５１の外面に流体圧が負荷されることによって助長さ
れる。The inner surface 52 of the elastic piece 51 of the one valve box sheet 5A is inclined in a direction in which the surface pressure becomes smaller than a predetermined value due to the deformation of the valve body 1 in the first direction, and the other valve is provided. The inner surface 55 of the elastic piece 54 of the box sheet 5B is inclined in a direction in which the surface pressure becomes larger than a predetermined value due to the deformation in the second direction. However, when the fluid pressure P1 applied when the valve body 1 is fully closed exceeds the design value, the first pressure is applied to the valve body 1.
Even if the deformation in the direction occurs, the elastic piece 51 of the one valve box sheet 5A elastically returns from the state shown by the solid line to the state shown by the two-dot chain line, and comes into pressure contact with the one valve body sheet 4A. Since it acts so as to avoid a decrease in surface pressure with the valve body sheet 4A, it is possible to reliably prevent the occurrence of fluid leakage therefrom. Further, the action of avoiding a decrease in the surface pressure with one of the valve body sheets 4A is promoted by applying a fluid pressure to the outer surface of the elastic piece 51, as indicated by the arrow group p.
【００１５】さらに、他方の弁箱シート５Ｂにおける弾
性片５４が実線で示す状態から、一点鎖線で示すよう
に、弁箱２の半径方向外側に弾性変形して少し撓んで他
方の弁体シート４Ｂに圧接し、該他方の弁体シート４Ｂ
との面圧上昇を回避するように作用するので、弁体１を
弁開方向に回転させる弁開操作が容易になる。Further, the elastic piece 54 of the other valve box sheet 5B is elastically deformed radially outward of the valve box 2 from the state shown by the solid line to the outside in the radial direction of the valve box 2 and slightly bent as shown by the dashed line. And the other valve body sheet 4B
Therefore, the valve opening operation of rotating the valve body 1 in the valve opening direction is facilitated.
【００１６】すなわち、弁体１の全閉時に該弁体１に設
計値を超える流体圧Ｐ１が負荷されることによって、弁
体１に前記第１方向および第２方向の変形が生じても、
面圧の低下による流体もれの発生および面圧の過剰な上
昇による弁開操作の困難を確実に解消することができ
る。That is, when the fluid pressure P1 exceeding the design value is applied to the valve body 1 when the valve body 1 is fully closed, the valve body 1 is deformed in the first and second directions.
It is possible to reliably eliminate the occurrence of fluid leakage due to the decrease in the surface pressure and the difficulty in opening the valve due to the excessive increase in the surface pressure.
【００１７】前記実施の形態では、弁体１に流体圧Ｐ１
が負荷される場合について説明しているが、弁体１に設
計値を超える逆方向の流体圧Ｐ２が負荷されて弁体１に
変形を生じた場合は、一方の弁箱シート５Ａの弾性片５
１と他方の弁箱シート５Ｂの弾性片５４が逆に作用し
て、面圧の低下による流体もれの発生および面圧の過剰
な上昇による弁開操作の困難を確実に解消することがで
きる。つまり、一方の弁箱シート５Ａにおける弾性片５
１が実線で示す状態から一点鎖線で示す状態に弾性変形
して、面圧の過剰な上昇による弁開操作の困難を確実に
解消し、他方の弁箱シート５Ｂにおける弾性片５４が実
線で示す状態から二点鎖線で示す状態に弾性復帰して、
面圧の過剰な上昇による弁開操作の困難を確実に解消す
ることができる。In the above-described embodiment, the fluid pressure P1
Is described, but when the valve body 1 is deformed by the application of the reverse fluid pressure P2 exceeding the design value to the valve body 1, the elastic piece of one valve box sheet 5A 5
The elastic pieces 54 of 1 and the other valve box sheet 5B act in reverse, and it is possible to reliably eliminate the occurrence of fluid leakage due to a decrease in surface pressure and the difficulty in opening a valve due to an excessive increase in surface pressure. . That is, the elastic piece 5 in one valve box sheet 5A
1 is elastically deformed from the state shown by the solid line to the state shown by the one-dot chain line, so that the difficulty of the valve opening operation due to the excessive rise of the surface pressure is surely eliminated, and the elastic piece 54 in the other valve box sheet 5B is shown by the solid line. Elastically returned from the state to the state shown by the two-dot chain line,
The difficulty of the valve opening operation due to the excessive increase in the surface pressure can be reliably eliminated.
【００１８】[0018]
【発明の効果】以上説明したように、本発明に係るメタ
ルシートバタフライは構成されているので、以下のよう
な格別の効果を奏する。As described above, since the metal sheet butterfly according to the present invention is constituted, the following special effects can be obtained.
【００１９】すなわち、弁体の全閉時に該弁体に設計値
を超える流体圧が負荷されることによって、弁体に変形
が生じても、この変形によって、弁体シートとのシール
面圧が低下する側の弁箱シートは、弾性復帰して弁体シ
ートに圧接して該弁体シートとの面圧低下を回避するよ
うに作用して、ここからの流体もれの発生を確実に防止
するとともに、弁体シートとのシール面圧が所定値より
も高くなる側の弁箱シートは、弾性変形により弁体シー
トに圧接して該弁体シートとの面圧上昇を回避するよう
に作用して、弁体を弁開方向に回転させる弁開操作を容
易にすることができる。That is, even if the valve element is deformed by applying a fluid pressure exceeding the design value to the valve element when the valve element is fully closed, the deformation causes the sealing surface pressure with the valve element sheet to be reduced. The lower valve box sheet is elastically restored and presses against the valve element sheet to act so as to avoid a decrease in surface pressure with the valve element sheet, thereby reliably preventing the occurrence of fluid leakage therefrom. In addition, the valve box sheet on the side where the sealing surface pressure with the valve body sheet is higher than a predetermined value acts so as to press against the valve body sheet by elastic deformation to avoid an increase in the surface pressure with the valve body sheet. Thus, the valve opening operation of rotating the valve body in the valve opening direction can be facilitated.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係るバタフライ弁の一実施の形態を示
す横断平面図である。FIG. 1 is a cross-sectional plan view showing an embodiment of a butterfly valve according to the present invention.
【図２】要部の拡大断面図である。FIG. 2 is an enlarged sectional view of a main part.
【図３】従来例の縦断正面図である。FIG. 3 is a longitudinal sectional front view of a conventional example.
【図４】図３の横断平面図である。FIG. 4 is a cross-sectional plan view of FIG.
【図５】従来の弁箱シートと弁体シートを示す拡大断面
図である。FIG. 5 is an enlarged sectional view showing a conventional valve box sheet and valve body sheet.
１ 弁体 ２ 弁箱 ３ 弁棒 ４Ａ 弁体シート ４Ｂ 弁体シート ５Ａ 弁箱シート ５Ｂ 弁箱シート Ｃ１ 弁箱の軸線 Ｃ２ 弁棒の軸線 Ｐ１ 流体圧 Ｐ２ 流体圧 Reference Signs List 1 valve body 2 valve box 3 valve rod 4A valve sheet 4B valve sheet 5A valve box sheet 5B valve box sheet C1 axis of valve box C2 axis of valve rod P1 fluid pressure P2 fluid pressure
Claims (1)
る弁棒に取付けられ、弁棒とともにその軸まわりに回転
可能に弁箱に収容され、その回転によって弁体外周部の
円周方向に分割された弁体シートが弁箱内面の円周方向
に分割された弁箱シートに接離して開閉を行うととも
に、前記弁体の全閉時に負荷される流体圧により該弁体
が変形した時に、弁体シートと弁箱シートとのシール面
圧が低下する部分と前記シール面圧が所定値よりも高く
なる部分が同時に発生するメタルシートバタフライ弁に
おいて、前記シール面圧が低下する側の弁箱シートは、
弾性復帰によって弁体シートに圧接して該弁体シートと
の面圧低下を回避し、前記シール面圧が所定値よりも高
くなる側の弁箱シートは、弾性変形により弁体シートに
圧接して該弁体シートとの面圧上昇を回避できるように
構成されていることを特徴とするメタルシートバタフラ
イ弁。A valve body is mounted on a valve stem having an axis crossing an axis of a valve box, and is housed in the valve box so as to be rotatable around the axis together with the valve stem. The valve body sheet divided in the direction of opening and closing contacts and separates from the circumferentially divided valve box sheet on the inner surface of the valve box to open and close, and the valve body is deformed by fluid pressure applied when the valve body is fully closed. When the sealing surface pressure of the valve body sheet and the valve box sheet is reduced, a portion where the sealing surface pressure is reduced and a portion where the sealing surface pressure is higher than a predetermined value are simultaneously generated. The valve box sheet is
The valve box sheet on the side where the sealing surface pressure is higher than a predetermined value is pressed against the valve body sheet by elastic contact and pressed against the valve body sheet to avoid a decrease in surface pressure with the valve body sheet. A metal seat butterfly valve configured to avoid an increase in surface pressure with the valve body seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000173618A JP2001355744A (en) | 2000-06-09 | 2000-06-09 | Metal seat butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000173618A JP2001355744A (en) | 2000-06-09 | 2000-06-09 | Metal seat butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001355744A true JP2001355744A (en) | 2001-12-26 |
Family
ID=18675816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000173618A Pending JP2001355744A (en) | 2000-06-09 | 2000-06-09 | Metal seat butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001355744A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015702A (en) * | 2001-08-17 | 2003-02-25 | 케이.비.(주) | Butterfly valve |
| JP2005537449A (en) * | 2002-08-29 | 2005-12-08 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Elliptical sealing surface for butterfly valves |
| JP2012072905A (en) * | 2005-12-21 | 2012-04-12 | Fisher Controls Internatl Llc | Flexible seal for process control valve |
| KR102095179B1 (en) * | 2019-02-12 | 2020-03-31 | 추승호 | Valve structure which has improved durability and which is ease to assemble |
-
2000
- 2000-06-09 JP JP2000173618A patent/JP2001355744A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015702A (en) * | 2001-08-17 | 2003-02-25 | 케이.비.(주) | Butterfly valve |
| JP2005537449A (en) * | 2002-08-29 | 2005-12-08 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Elliptical sealing surface for butterfly valves |
| JP2012072905A (en) * | 2005-12-21 | 2012-04-12 | Fisher Controls Internatl Llc | Flexible seal for process control valve |
| KR102095179B1 (en) * | 2019-02-12 | 2020-03-31 | 추승호 | Valve structure which has improved durability and which is ease to assemble |
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