JP2001059577A - Valve element for butterfly valve of doubly eccentric structure - Google Patents

Valve element for butterfly valve of doubly eccentric structure

Info

Publication number
JP2001059577A
JP2001059577A JP11234618A JP23461899A JP2001059577A JP 2001059577 A JP2001059577 A JP 2001059577A JP 11234618 A JP11234618 A JP 11234618A JP 23461899 A JP23461899 A JP 23461899A JP 2001059577 A JP2001059577 A JP 2001059577A
Authority
JP
Japan
Prior art keywords
valve
valve body
center
seat ring
spherical
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.)
Granted
Application number
JP11234618A
Other languages
Japanese (ja)
Other versions
JP3550513B2 (en
Inventor
Toshiki Mihara
利幾 三原
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.)
Tomoe Technical Research Co Ltd
Original Assignee
Tomoe Technical Research 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 Tomoe Technical Research Co Ltd filed Critical Tomoe Technical Research Co Ltd
Priority to JP23461899A priority Critical patent/JP3550513B2/en
Publication of JP2001059577A publication Critical patent/JP2001059577A/en
Application granted granted Critical
Publication of JP3550513B2 publication Critical patent/JP3550513B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To reduce a sudden change in rotational torque at the time when a valve element starts to move from a fully closed position to separate the element from a seat ring completely. SOLUTION: A contact sealing face between a valve element 11 and a seat ring 12 in a valve-closed condition is formed to have continuously two spherical surfaces of a spherical surface Rb in a side having a valve rod 13 and a spherical surface Ra in a side having no valve rod 13 with a boundary line X-X' therebetween, which passes through a contact point of the valve element 11 and the seat ring 12, and spherical center positions of the respective spherical surfaces Ra, Rb are different centers (1), (2) respectively, where, the valve element 11 of a doubly eccentric type butterfly valve of which a center of the valve rod 13 does not exist in a center of a body aperture, and of which a valve element sealing face is made eccentric from the center of the valve rod 13.

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、バタフライ弁の弁
体構造に関し、弁体のシール面が弁棒の中心から偏心し
ており、更に弁棒の中心が本体(弁本体)口径の中心に
ない二重偏心構造のバタフライ弁の弁体の弁体構造(形
状)に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body structure of a butterfly valve, in which the sealing surface of the valve body is eccentric from the center of the valve stem, and the center of the valve stem is not at the center of the diameter of the main body (valve main body). The present invention relates to a valve body structure (shape) of a valve body of a butterfly valve having a double eccentric structure.

【0002】[0002]

【従来の技術】従来、バタフライ弁の弁体形式には、図
7(a)に示すように、弁体シール面が弁棒の中心と同
一線上にある構造形式の中心形バタフライ弁体と、図7
(b)に示すように、弁棒が本体の口径の中心にあり、
弁体シール面が弁棒の中心から偏心している構造形成の
一重偏心形バタフライ弁体と、図7(c)に示すよう
に、弁棒の中心が本体の中心になく、更に弁体シール面
が弁棒の中心から偏心している構造形成の二重偏心形バ
タフライ弁に大別されており、それぞれの弁体構造に特
有の性質を有している。
2. Description of the Related Art Conventionally, as a butterfly valve type, as shown in FIG. 7 (a), a center type butterfly valve body having a structure in which a valve body sealing surface is on the same line as the center of a valve stem, FIG.
As shown in (b), the valve stem is at the center of the bore of the main body,
A single eccentric butterfly valve body having a structure in which the valve body sealing surface is eccentric from the center of the valve stem, and, as shown in FIG. 7 (c), the center of the valve stem is not at the center of the main body, and the valve body sealing surface is further increased. Are broadly divided into double eccentric butterfly valves having a structure eccentric from the center of the valve stem, and each valve body structure has a characteristic.

【0003】例えば、中心形弁体は構造が対称形をなし
ていて簡単であるが、弁開から弁閉の間、常時弁体の上
下部がシートリングと接触し、中間開度における操作ト
ルクが重くなり勝ちであるという欠点があり、また、一
重偏心形弁体は、偏心構造が複雑であるが、全閉時には
弁体の全周面がシートリングと当接してシール効果が優
れており、また上記中心形弁体におけるように常時弁体
の上下部がシートリングと接触しないため、中間開度に
おける弁体とシートリングとの接触部におけるトルクが
軽減する利点がある。ところが、一重偏心構造では弁体
開閉時の軌跡はシートリングに『内接』する円弧にな
る。そのため、弁体シール面とシートリングが離脱する
までに多少の弁開度が必要になる。ところが、二重偏心
構造にすることにより、この弁体とシートリングの離脱
角度、すなわち弁体とシートリングが摺動し、操作トル
クの重い角度範囲を減少させることができる。従って弁
体の回転角度に対する弁体シートリングとの圧縮量の変
化が、弁体が開いていくに従って緩やかに減少してゆく
利点を有している。また、同時に摺動範囲も小さくなる
ため、シートリングの耐久性も向上させることができ
る。
[0003] For example, the central valve body has a symmetrical structure and is simple, but the upper and lower portions of the valve body are always in contact with the seat ring during opening and closing of the valve, and the operating torque at an intermediate opening degree. However, the single eccentric valve body has a complicated eccentric structure, but when fully closed, the entire peripheral surface of the valve body comes into contact with the seat ring, and the sealing effect is excellent. Further, since the upper and lower portions of the valve body do not always contact the seat ring as in the center type valve body, there is an advantage that the torque at the contact portion between the valve body and the seat ring at an intermediate opening is reduced. However, in the single eccentric structure, the trajectory at the time of opening and closing the valve body is an arc "inscribed" in the seat ring. Therefore, a certain degree of valve opening is required before the valve body sealing surface and the seat ring are separated. However, by adopting the double eccentric structure, the separation angle between the valve body and the seat ring, that is, the valve body and the seat ring slide, and the angle range where the operation torque is heavy can be reduced. Accordingly, there is an advantage that the change in the amount of compression with the valve body seat ring with respect to the rotation angle of the valve body gradually decreases as the valve body opens. At the same time, the sliding range is reduced, so that the durability of the seat ring can be improved.

【0004】本発明は、上記した二重偏心形バタフライ
弁の弁体に関するものであって、その一般的な弁体形状
は、図2及び図3に示されている。
The present invention relates to a valve element of the above-mentioned double eccentric butterfly valve, and a general valve element shape is shown in FIGS. 2 and 3.

【0005】図2に示すものは、弁体1のシール面1a
は、単一の球面R形状を呈しており、本体2の中心
から偏心して支持された弁棒3によって弁体1
が、矢印に示す反時計方向に、シートリング4と全閉さ
れた状態から開くようになっており、また、図3に示す
ものは、シール面が円錐面Rを呈している。また、
シートリング4は、弁体1から適切な圧縮力を与えられ
ることにより、上流側流体が弁体1とシートリング4の
間を通って下流側へ漏れることを防いでいる。なお、両
図2,3において、Oは弁棒3の回転中心を示して
いる。
FIG. 2 shows the sealing surface 1a of the valve body 1.
Has a single spherical surface R 1 shape, and the valve element 1 is supported by the valve stem 3 supported eccentrically from the center O 1 of the main body 2.
But in a counterclockwise direction indicated by the arrow, the sheet ring 4 is adapted to open from the fully closed state, and that shown in FIG. 3, the seal surface exhibits a conical surface R 2. Also,
The seat ring 4 is provided with an appropriate compressive force from the valve body 1, thereby preventing the upstream fluid from leaking downstream between the valve body 1 and the seat ring 4. 2 and 3, O 2 indicates the center of rotation of the valve stem 3.

【0006】図4は、上記した従来の一般的二重偏心形
バタフライ弁の弁体の作用を、分かり易く拡大して図解
する説明図で、図中、図2と同一ないし同類部分には同
一の符号を記載している。図4において、弁体1が弁棒
3の中心Oを中心にして矢印に示す反時計方向に回
転すると、弁体1の周面(球R)とシートリング4
とが圧接している状態を示す円形イとロのそれぞれの拡
大図イ′とロ′からみても分かるように、弁体1の周面
が点線で示す軌跡に沿ってシートリング4との圧接面か
らゆるやかに離れるように移動するので、弁体の回転角
度に対する弁体とシートリングとの圧縮量の変化は、弁
体1が開いて行くに従って緩やかに減少してゆく。この
現象は、図2の垂直中心線の左L側についても、また右
R側についても同様であるが、図5に示す弁体周面部の
球面Rの範囲内では、弁体1とシートリングが完全に離
れず、「後R」の部分まで回転した時点で離れるため、
弁体の回転角度に対する弁体とシートリングとの圧縮量
は急激に変化する。
FIG. 4 is an explanatory view illustrating the operation of the above-mentioned conventional general double eccentric butterfly valve by enlarging it for easy understanding. In FIG. 4, the same or similar parts as those in FIG. Are described. In FIG. 4, when the valve element 1 rotates counterclockwise around the center O 2 of the valve stem 3 as indicated by an arrow, the peripheral surface (sphere R 1 ) of the valve element 1 and the seat ring 4
As can be seen from the enlarged views a ′ and b ′ of the circular circles a and b showing the state in which the valve body 1 is in pressure contact, the peripheral surface of the valve body 1 is pressed against the seat ring 4 along the locus indicated by the dotted line. Since the valve body moves slowly away from the surface, the change in the amount of compression between the valve body and the seat ring with respect to the rotation angle of the valve body gradually decreases as the valve body 1 opens. This phenomenon is the same on the left L side and the right R side of the vertical center line in FIG. 2, but within the range of the spherical surface R of the valve element peripheral surface shown in FIG. Does not completely separate, but separates when rotated to the "R" part,
The amount of compression between the valve body and the seat ring with respect to the rotation angle of the valve body changes rapidly.

【0007】この急激な変化を防止する方法として、弁
体が開方向に回転し、シートリングと弁体が完全に離れ
る角度まで弁体の球面幅を広くすることが考えられる。
しかし、シートリングと弁棒中心間の距離、図2中のH
1寸法、即ち一次偏心量を大きくすることになる。一
方、弁の両端面間の距離(巾)は、各種規格で定められ
ており、それらの規格に準拠した弁とする場合、決めら
れた面間寸法内で一次偏心量を設定しなければならな
い。
As a method of preventing such a sudden change, it is conceivable to increase the spherical width of the valve body until the valve body rotates in the opening direction and the seat ring and the valve body are completely separated from each other.
However, the distance between the seat ring and the center of the valve stem, H in FIG.
One dimension, that is, the primary eccentric amount is increased. On the other hand, the distance (width) between both end surfaces of the valve is determined by various standards, and when a valve conforms to those standards, the primary eccentricity must be set within the determined distance between the surfaces. .

【0008】このような制約により、従来の二重偏心形
バタフライ弁の弁体は、シール部分の球面幅をシートリ
ングと弁体が離脱する角度まで幅を広げることができな
かった。図3の場合のR側については、弁体が開閉する
際に図2の場合以上に「後R」(図5)部分での圧縮量
の変化はより急激なものとなる。
Due to such a restriction, the valve body of the conventional double eccentric butterfly valve cannot increase the spherical width of the seal portion to an angle at which the seat ring and the valve body are separated. On the R side in the case of FIG. 3, when the valve element opens and closes, the change in the compression amount in the “rear R” (FIG. 5) portion becomes more abrupt than in the case of FIG.

【0009】これらの欠点を解決する手段として、米国
特許第4265426号がある。これは弁体のシール面
が、図6に示すような中心を傾けた円錐面で形成されて
いるものである。しかし、この場合、本体、弁体、シー
ト全てを特殊な三重偏心構造に加工する必要があり、加
工工程が複雑となり、製造コストも割高となりがちであ
る。
As a means for solving these disadvantages, there is US Pat. No. 4,265,426. This is one in which the sealing surface of the valve body is formed by a conical surface whose center is inclined as shown in FIG. However, in this case, it is necessary to process all of the main body, the valve element, and the sheet into a special triple eccentric structure, which complicates the processing steps and tends to increase the manufacturing cost.

【0010】[0010]

【発明が解決しようとする課題】上記した従来の一般的
な二重偏心形弁体形状を採用した場合、図8に示すよう
に、全閉から微小開度へ開く時、弁体によるシートリン
グへの圧縮量の急激な減少による、シーティングトルク
の急激な減少が問題となる。これは、特に駆動部が空気
圧式のフィードバック制御の駆動部を使用している場合
に、問題となる場合が多く、トルクの急激な減少によ
り、目標開度を超えた開度まで開き、その後、目標開度
まで閉まってゆくというような不安定な動きをする場合
がある。
When the above-described conventional general double eccentric valve body is adopted, as shown in FIG. 8, when the valve is opened from the fully closed position to the minute opening, the seat ring by the valve member is used. A sudden decrease in the seating torque due to a sudden decrease in the amount of compression to the head causes a problem. This often becomes a problem, especially when the drive unit uses a pneumatic feedback control drive unit, and due to a sudden decrease in torque, the drive unit opens to an opening exceeding the target opening, and thereafter, An unstable movement such as closing to the target opening may occur.

【0011】このことはシーティングトルクと、弁体と
シートリングが離れた後の軸受や軸封パッキンの摩擦ト
ルクとのトルクの差が大きく、変化が急激に起こること
に起因していた。
This is because the difference between the seating torque and the friction torque of the bearing and the shaft seal after the valve body and the seat ring are separated from each other is large, and the change occurs rapidly.

【0012】本発明は、上記した従来技術の問題点を解
決し、弁体が全閉位置から開き始め、弁体とシートリン
グが完全に離脱する時の回転トルクの急激な変化を低減
する二重偏心構造のバタフライ弁の弁体を提供すること
を課題としている。
The present invention solves the above-mentioned problems of the prior art, and reduces a sudden change in rotational torque when the valve element starts to open from the fully closed position and the valve element and the seat ring are completely separated. It is an object to provide a butterfly valve element having a heavy eccentric structure.

【0013】[0013]

【課題を解決するための手段】上記の課題を解決するた
めに、本発明の採った手段は、弁棒の中心が本体口径の
中心になく、更に弁体シール面が弁棒の中心から偏心し
て構成されている二重偏心形バタフライ弁の弁体におい
て、弁閉状態における弁体とシートリングとの接触シー
ル面を、弁体とシートリングの接触点を通る境界線を挿
んで弁棒の有る側の球面(Rb)と、弁棒の無い側の球
面(Ra)の二つの球面を連続して形成し、それぞれの
球面(RaとRb)の球中心位置を異った点としたこと
を特徴としている。
In order to solve the above-mentioned problems, the means adopted by the present invention is that the center of the valve stem is not at the center of the body diameter, and the valve body sealing surface is deviated from the center of the valve stem. In the valve body of the double eccentric type butterfly valve configured to be centered, the contact seal surface between the valve body and the seat ring in the valve closed state is inserted into the boundary line passing through the contact point between the valve body and the seat ring to form the valve stem. Two spherical surfaces, a spherical surface on the side (Rb) and a spherical surface on the side without the valve stem (Ra), are formed continuously, and the spherical center positions of the respective spherical surfaces (Ra and Rb) are set to different points. It is characterized by.

【0014】また、弁体とシートリングの接触点を通る
境界線を挿んで弁棒の有る側の球面(Rb)の球中心位
置からの半径を小さくし、弁棒の無い側の球面(Ra)
の球中心位置からの半径を大きくしたことを特徴とす
る。
Also, the radius of the spherical surface (Rb) on the side with the valve stem is reduced from the center of the sphere by inserting a boundary line passing through the contact point between the valve body and the seat ring, and the spherical surface on the side without the valve stem (Ra) is set. )
Characterized in that the radius from the center of the sphere is increased.

【0015】また、弁閉状態における弁体とシートリン
グとの接触シール面の、弁棒の無い側の球面(Ra)の
弁棒中心の左側つまり開方向の後部側の球面幅を、右側
つまり開方向の前部側より広くしたことを特徴とし、ま
た、弁閉状態における弁体とシートリングとの接触シー
ル面の、弁棒の有る側の球面(Rb)の弁棒中心の右側
つまり開方向の後部側の球面幅を、左側つまり開方向の
前部側より広くしたことを特徴としている。
The spherical width of the contact seal surface between the valve body and the seat ring in the valve closed state on the side without the valve stem (Ra) on the left side of the center of the valve stem, ie, on the rear side in the opening direction, is defined as the right side, ie, The valve is characterized in that it is wider than the front side in the opening direction, and the right side of the center of the valve stem of the spherical surface (Rb) on the side where the valve stem is located on the contact seal surface between the valve body and the seat ring in the valve closed state. The width of the spherical surface on the rear side in the direction is wider than that on the left side, that is, the front side in the opening direction.

【0016】[0016]

【発明の実施の形態】次に、本発明の実施の形態を図面
に記載した実施例を用いて説明する。図1は、本発明の
弁体形状の一例を示す弁棒軸に直角方向の断面図であっ
て、当該弁体11は、弁体11とシートリング12の接
触点を通る境界線X−X′を挿んで、弁棒13を下方に
示した図の上側の弁体シール面(右斜め上方に向かう斜
線で示す部分)11aは、図2と同様に、本体の球形中
心をセンターとする球Ra面で構成されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view in a direction perpendicular to a valve stem axis showing an example of a valve body shape of the present invention. The valve body 11 has a boundary line XX passing through a contact point between the valve body 11 and a seat ring 12. ′, And the upper valve body sealing surface 11a of the figure showing the valve rod 13 below (the part shown by oblique lines going obliquely upward to the right) is a sphere centered on the spherical center of the main body as in FIG. It is composed of an Ra surface.

【0017】次に、X−X′境界線より下側の弁体シー
ル面(右斜め下方に向かう斜線で示す部分)11bは、
上記球形中心より若干図の上方に位置する中心をセ
ンターとする球Rb面で構成されている。
Next, a valve body sealing surface 11b below the XX 'boundary line (a portion indicated by oblique lines directed obliquely downward to the right) 11b
It is composed of a sphere Rb with its center located slightly above the center of the sphere in the figure.

【0018】上記のように弁体周面における境界線X−
X′を挿んで上側のシール面Ra部分の左L部の球面幅
を広くしているので、境界線X−X′を挿んで下側のシ
ール面Rb部分の左L側の球面幅は狭く構成されてお
り、また、境界線X−X′を挿んで下側のシール面Rb
部分の右R側の球面幅を広くしているので、境界線X−
X′を挿んで上側のシール面Ra部分の右R側の球面幅
は狭く構成されている。
As described above, the boundary line X-
Since the spherical width of the left L portion of the upper seal surface Ra is increased by inserting X ', the spherical width of the left L side of the lower seal surface Rb is narrowed by inserting the boundary line XX'. And the lower sealing surface Rb with the boundary line XX ′ inserted.
Since the spherical width on the right R side of the portion is increased, the boundary line X-
The spherical width on the right R side of the upper sealing surface Ra portion with X 'inserted is configured to be narrow.

【0019】次に、作用について説明すると、弁体が矢
印の反時計方向の開方向へ回転すると、L側、R側共に
従来の一般的な二重偏心構造のバタフライ弁と同様に、
弁体が開くにつれて弁体とシートリングの圧縮量は徐々
に減少してゆく。
Next, the operation will be described. When the valve element rotates in the opening direction in the counterclockwise direction indicated by the arrow, both the L and R sides are similar to the conventional general double eccentric butterfly valve.
As the valve body opens, the amount of compression between the valve body and the seat ring gradually decreases.

【0020】しかし、前述のようにX−X′境界線より
下側の球Rbの中心を、球Raの中心より若干上方に
位置する中心に偏心させていることによって、回転半
径が短くなって従来の二重偏心構造のバタフライ弁の場
合(図2、図4)と比べて右R側では少ない回転角度で
弁体とシートリングが離脱する。
However, as described above, since the center of the sphere Rb below the XX 'boundary is eccentric to the center slightly above the center of the sphere Ra, the radius of rotation is reduced. As compared with the conventional double eccentric butterfly valve (FIGS. 2 and 4), the valve body and the seat ring separate from each other at a smaller rotation angle on the right R side.

【0021】また、左L側については、球Ra部の球面
幅が拡大されているので、従来形状の弁体(図2、図
4)で問題となる球面と「前R」(図5)との境界部で
起こる、弁体によるシートリングへの圧縮量の急激な減
少を防止している。
On the left L side, since the spherical surface width of the spherical portion Ra is enlarged, the spherical surface and the "front R" (FIG. 5) which are problematic in the conventional valve body (FIG. 2 and FIG. 4). This prevents the valve body from rapidly reducing the amount of compression applied to the seat ring by the valve body.

【0022】以上のように、弁体とシートリングが離脱
する時、弁体回転角度に対する弁体によるシートリング
への圧縮量は、左L側、右R側共に緩かに減少し、急激
な変化は起こさない。このことは、シートリングが弁体
から離脱する位置が、左L側では幅の広い球Ra面、右
R側では同じく幅の広い球Rb面の範囲内であることに
よっている。
As described above, when the valve body and the seat ring are separated, the amount of compression of the valve body by the valve body with respect to the rotation angle of the valve body decreases gently on both the left L side and the right R side, and suddenly decreases. No change. This is because the position where the seat ring separates from the valve body is within the range of the wide sphere Ra surface on the left L side and the wide sphere Rb surface on the right R side.

【0023】以上述べた実施態様において、弁体とシー
トリングの接触点を通る境界線を挿んで弁棒の有る側に
おいては、球面(Rb)のR側を広く取り、L側を狭く
している。また、弁棒の無い側においては、球面(R
a)のR側を狭く取り、L側を広くしている場合の構造
について説明したが、弁体とシートリングの接触点を通
る境界線を挿んで弁棒の有る側において、球面(Rb)
のR側の広い球面と同じ巾でL側を構成し、また、弁棒
の無い側においても、球面(Ra)のL側の広い球面と
同じ巾でR側を構成してもよい。
In the embodiment described above, on the side where the valve stem is inserted by inserting the boundary line passing through the contact point between the valve element and the seat ring, the R side of the spherical surface (Rb) is made wider and the L side is made narrower. I have. On the side without the valve stem, the spherical surface (R
Although the structure in which the R side is narrowed and the L side is widened in a) has been described, the spherical surface (Rb) is formed on the side having the valve stem by inserting the boundary passing through the contact point between the valve element and the seat ring.
The L side may be configured with the same width as the wide spherical surface on the R side, and the R side may be configured with the same width as the wide spherical surface on the L side of the spherical surface (Ra) even on the side without the valve stem.

【0024】この場合の利点として、弁体を旋削加工す
る場合に断続切削になることなく、連続的に加工出来る
ことがあげられる。このことによって、加工時間の短
縮、旋削加工用刃物が長持ちする等の効果が得られる。
An advantage of this case is that when the valve body is turned, continuous machining can be performed without interrupted cutting. As a result, effects such as a reduction in processing time and a long-lasting cutting tool can be obtained.

【0025】[0025]

【発明の効果】以上説明したように、本発明によれば、
弁棒の中心が本体口径の中心になく、更に弁体シール面
が弁棒の中心から偏心して構成されている二重偏心形バ
タフライ弁の弁体において、弁閉状態における弁体とシ
ートリングとの接触シール面を、弁体とシートリングの
接触点を通る境界線を挿んで弁棒の有る側の球面(R
b)と、弁棒の無い側の球面(Ra)の二つの球面を連
続して形成し、それぞれの球面(RaとRb)の球中心
位置を異った点としたことにより、次のような効果を奏
することができる。
As described above, according to the present invention,
In the valve body of the double eccentric type butterfly valve in which the center of the valve stem is not at the center of the body diameter and the valve body sealing surface is eccentric from the center of the valve stem, the valve body and the seat ring in the valve closed state Of the contact seal surface of the valve stem and the spherical surface (R
b) and two spherical surfaces (Ra) on the side without the valve stem are formed continuously, and the spherical center positions of the respective spherical surfaces (Ra and Rb) are set to different points. Effects can be achieved.

【0026】(i)二重偏心構造のバタフライ弁用の弁
体において、弁体周縁部の球面の範囲内において、弁体
とシートリングとが離れるので、弁体が閉止位置より開
き始め、弁体とシートリングが完全に離脱する時の回転
トルクの急激な変化を低減することができる。
(I) In a valve element for a butterfly valve having a double eccentric structure, the valve element and the seat ring are separated from each other within the spherical surface of the peripheral part of the valve element. It is possible to reduce a sudden change in the rotational torque when the body and the seat ring are completely separated.

【0027】(ii) 弁体の回転角度に対する、弁体とシ
ートリングの圧縮量の変化がスムーズになるので、空気
式のアクチュエータでの微小開度における制御も安定し
て問題なく使用することができる。
(Ii) Since the change in the amount of compression between the valve body and the seat ring with respect to the rotation angle of the valve body becomes smooth, it is possible to stably use the pneumatic actuator for controlling the minute opening without any problem. it can.

【0028】(iii) 各種規格で定められた、限られた面
間寸法の中でも本発明の弁体形状を採用し、弁体・弁棒
・及びシール構造を組込むことが可能である。
(Iii) It is possible to adopt the valve body shape of the present invention and to incorporate a valve body, a valve rod, and a seal structure among limited face-to-face dimensions defined by various standards.

【0029】また、弁体とシートリングの接触点を通る
境界線を挿んで弁棒の有る側の球面(Rb)の球中心位
置からの半径を小さくし、弁棒の無い側の球面(Ra)
の球中心位置からの半径を大きくしたことにより、従来
の二重偏心構造のバタフライ弁の場合と比べて、右R側
では少ない回転角度で弁体とシートリングが離脱し、ま
た左L側については、球Ra部の球面幅を拡大し、従来
形状の弁体で問題となる球面と「前R」との境界部で起
こる、弁体によるシートリングへの圧縮量の急激な減少
を防止することができる。このように、シートリングが
弁体から離脱する位置を左L側では球面Ra面、右R側
では球Rb面の範囲内とすることにより、弁体とシート
リングが離脱する時、弁体回転角度に対する弁体による
シートリングへの圧縮量はL側、R側共に緩やかに減少
し、急激な変化は起こさない。
Also, the radius of the spherical surface (Rb) on the side with the valve stem is reduced from the center of the sphere by inserting a boundary line passing through the contact point between the valve element and the seat ring, and the spherical surface (Ra) on the side without the valve stem is formed. )
By increasing the radius from the center of the sphere, the valve body and the seat ring separate with a smaller rotation angle on the right R side than on the conventional double eccentric butterfly valve, and the left L side Increases the spherical width of the spherical portion Ra to prevent a sudden decrease in the amount of compression of the seat ring by the valve body, which occurs at the boundary between the spherical surface and the "front R", which is a problem in the conventional valve body. be able to. As described above, the position at which the seat ring separates from the valve body is within the range of the spherical surface Ra on the left L side and the spherical surface Rb on the right R side. The compression amount of the valve body to the seat ring with respect to the angle gradually decreases on both the L side and the R side, and does not cause a sudden change.

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

【図1】本発明の一実施形態を示す二重偏心構造のバタ
フライ弁の弁体の弁棒に直角方向の断面図である。
FIG. 1 is a cross-sectional view in a direction perpendicular to a valve stem of a valve body of a butterfly valve having a double eccentric structure, showing one embodiment of the present invention.

【図2】シール面に球面を有する一般的な二重偏心構造
のバタフライ弁用の弁棒に直角方向の弁体形状である。
FIG. 2 shows a valve body in a direction perpendicular to a valve stem for a butterfly valve having a general double eccentric structure having a spherical surface on a sealing surface.

【図3】シール面に円錐面をもつ一般的な二重偏心構造
のバタフライ弁用の弁体形状である。
FIG. 3 shows a valve body shape for a butterfly valve having a general double eccentric structure having a conical surface on a sealing surface.

【図4】従来の二重偏心構造のバタフライ弁の弁体の作
用を示す説明用図面である。
FIG. 4 is an explanatory drawing showing an operation of a valve body of a conventional butterfly valve having a double eccentric structure.

【図5】図2の補足説明用図面である。FIG. 5 is a drawing for supplementary explanation of FIG.

【図6】従来技術の一つである三重偏心構造の弁体形状
の一例の要部を示す図面である。
FIG. 6 is a view showing a main part of an example of a valve body shape of a triple eccentric structure which is one of the prior arts.

【図7】(a)(b)(c)はバタフライ弁の弁体形式
を示す説明用図面である。
FIGS. 7 (a), (b) and (c) are explanatory drawings showing a valve body type of a butterfly valve.

【図8】作用の説明用図面である。FIG. 8 is a drawing for explaining the operation.

【符号の説明】[Explanation of symbols]

11 弁体 11a 境界線X−X′の上側の弁体シール面 11b 境界線X−X′の下側の弁体シール面 12 シートリング 13 弁棒 中心 球Raの中心 中心 球Rbの中心 中心 弁棒13の中心 DESCRIPTION OF SYMBOLS 11 Valve body 11a Valve body sealing surface above boundary line XX '11b Valve body sealing surface below boundary line XX' 12 Seat ring 13 Valve stem Center of sphere Ra Center of sphere Rb Center valve Center of rod 13

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 弁棒の中心が本体口径の中心になく、更
に弁体のシール面が弁棒の中心から偏心して構成されて
いる二重偏心形バタフライ弁の弁体において、弁閉状態
における弁体とシートリングとの接触シール面を、弁体
とシートリングの接触点を通る境界線を挿んで弁棒の有
る側の球面(Rb)と、弁棒の無い側の球面(Ra)の
二つの球面を連続して形成し、それぞれの球面(Raと
Rb)の球中心位置を異った点としたことを特長とする
二重偏心構造のバタフライ弁の弁体。
In a double-eccentric butterfly valve, the center of the valve stem is not located at the center of the body diameter, and the sealing surface of the valve body is eccentric from the center of the valve stem. The contact seal surface between the valve element and the seat ring is divided into a spherical surface (Rb) having a valve stem by inserting a boundary line passing through a contact point between the valve element and the seat ring, and a spherical surface (Ra) having no valve stem. A valve element for a butterfly valve having a double eccentric structure, characterized in that two spherical surfaces are continuously formed and the spherical center positions of the respective spherical surfaces (Ra and Rb) are different.
【請求項2】 弁体とシートリングの接触点を通る境界
線を挿んで弁棒の有る側の球面(Rb)の球中心位置か
らの半径を小さくし、弁棒の無い側の球面(Ra)の球
中心位置からの半径を大きくしたことを特徴とする請求
項1記載の二重偏心構造のバタフライ弁の弁体。
2. A sphere from the center of the spherical surface (Rb) having a valve stem is reduced by inserting a boundary line passing through a contact point between the valve body and the seat ring, and a spherical surface (Ra) having no valve stem is provided. 3. The valve element according to claim 1, wherein the radius from the center of the sphere is increased.
【請求項3】 弁閉状態における弁体とシートリングと
の接触シール面の、弁棒の無い側の球面(Ra)の弁棒
中心の左側つまり開方向の後部側の球面幅を、右側つま
り開方向の前部側より広くしたことを特徴とする請求項
1又は2記載の二重偏心構造のバタフライ弁の弁体。
3. The spherical width of the contact seal surface between the valve body and the seat ring in the valve closed state on the left side of the center of the valve stem on the side without the valve stem (Ra), that is, on the rear side in the opening direction, The valve body of a butterfly valve having a double eccentric structure according to claim 1 or 2, wherein the valve body is wider than a front side in an opening direction.
【請求項4】 弁閉状態における弁体とシートリングと
の接触シール面の、弁棒の有る側の球面(Rb)の弁棒
中心の右側つまり開方向の後部側の球面幅を、左側つま
り開方向の前部側より広くしたことを特徴とする請求項
1ないし3の何れか1項記載の二重偏心構造のバタフラ
イ弁の弁体。
4. The spherical surface width (Rb) of the contact seal surface between the valve element and the seat ring in the valve closed state on the right side of the center of the valve stem, that is, on the rear side in the opening direction, is defined as the left side. The valve body of a butterfly valve having a double eccentric structure according to any one of claims 1 to 3, wherein the valve body is wider than a front portion in an opening direction.
JP23461899A 1999-08-20 1999-08-20 Butterfly valve body with double eccentric structure Expired - Fee Related JP3550513B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23461899A JP3550513B2 (en) 1999-08-20 1999-08-20 Butterfly valve body with double eccentric structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23461899A JP3550513B2 (en) 1999-08-20 1999-08-20 Butterfly valve body with double eccentric structure

Publications (2)

Publication Number Publication Date
JP2001059577A true JP2001059577A (en) 2001-03-06
JP3550513B2 JP3550513B2 (en) 2004-08-04

Family

ID=16973877

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23461899A Expired - Fee Related JP3550513B2 (en) 1999-08-20 1999-08-20 Butterfly valve body with double eccentric structure

Country Status (1)

Country Link
JP (1) JP3550513B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1297769C (en) * 2003-07-23 2007-01-31 黄剑峰 Metal butterfly valve for sealing
CN1322259C (en) * 2005-10-18 2007-06-20 四川东风电机厂有限公司 Integrated two plane hydraulic butterfly valve
KR101092196B1 (en) * 2008-08-25 2011-12-13 노창전 Disk for butterfly valve
CN107940019A (en) * 2017-12-30 2018-04-20 营口辽河药机制造有限公司 A kind of new no dead angle powder outlet valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1297769C (en) * 2003-07-23 2007-01-31 黄剑峰 Metal butterfly valve for sealing
CN1322259C (en) * 2005-10-18 2007-06-20 四川东风电机厂有限公司 Integrated two plane hydraulic butterfly valve
KR101092196B1 (en) * 2008-08-25 2011-12-13 노창전 Disk for butterfly valve
CN107940019A (en) * 2017-12-30 2018-04-20 营口辽河药机制造有限公司 A kind of new no dead angle powder outlet valve

Also Published As

Publication number Publication date
JP3550513B2 (en) 2004-08-04

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