JPH0942533A - Butterfly valve having main valve and auxiliary valve - Google Patents
Butterfly valve having main valve and auxiliary valveInfo
- Publication number
- JPH0942533A JPH0942533A JP19466795A JP19466795A JPH0942533A JP H0942533 A JPH0942533 A JP H0942533A JP 19466795 A JP19466795 A JP 19466795A JP 19466795 A JP19466795 A JP 19466795A JP H0942533 A JPH0942533 A JP H0942533A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- main
- valve body
- sub
- main valve
- 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
- Details Of Valves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主弁体内に副弁体
を設け、流量調整範囲を拡大可能にした中心型バタフラ
イ弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a central butterfly valve in which a main valve body is provided with a sub-valve body so that a flow rate adjusting range can be expanded.
【０００２】[0002]
【従来の技術】配管系にバタフライ弁を設けて流量を制
御する場合、該バタフライ弁の主要部材としての本体、
弁体、シートリング、弁棒等が大きな絞り作用が加わる
ことになり、これらの主要部材で大きな圧力変化、即ち
差圧が生じ、その結果、キャビテーションを発生して騒
音や振動を発生する原因となっている。この結果、最悪
時には前記主要部材の損傷に至り、バルブとしての機能
を失なうこともあった。2. Description of the Related Art When a butterfly valve is provided in a piping system to control a flow rate, a main body as a main member of the butterfly valve,
A large throttling action is applied to the valve body, seat ring, valve rod, etc., causing a large pressure change, that is, a differential pressure, in these main members, resulting in cavitation and noise and vibration. Has become. As a result, in the worst case, the main member may be damaged and the function as a valve may be lost.
【０００３】上記の問題にかんがみ、回転弁を操作する
際になるべく急激な絞り作用を与えないようにするため
に、従来、回転弁を２台或いは２台以上直列に設置し、
回転弁１台当りの絞りの量を少なくしてキャビテーショ
ンを生じないようにしていた。In view of the above problems, in order to prevent a sudden throttling action when operating a rotary valve, conventionally two rotary valves or two or more rotary valves are installed in series,
The amount of throttling per rotary valve was reduced to prevent cavitation.
【０００４】ところが、複数台の回転弁を直列に配列す
る場合、広い設置場所を必要とする上、コストが増加
し、他方、特性の異なる回転弁を複数個直列に設けた場
合には、一方の弁の特性が他方の弁の特性に影響を与え
るために、回転弁の調節がかなり複雑化してしまうとい
う問題点があった。この問題点に対処するために、回転
弁の中央の開口部に小型の弁体を設け、これらを相対的
に回転して流量を種々に調節できるようにし、この回転
弁をコック弁体に類似した主弁体とし、該主弁体に内蔵
される小形の弁体をバタフライ弁状の副弁体とし、これ
ら両弁体を合体して弁体を二重構造としたものが、既に
開発され公知である。（特公昭５５−５０５９５号公報
参照）However, when a plurality of rotary valves are arranged in series, a large installation place is required and the cost is increased. On the other hand, when a plurality of rotary valves having different characteristics are provided in series, There is a problem in that the adjustment of the rotary valve is considerably complicated because the characteristics of the valve affect the characteristics of the other valve. In order to deal with this problem, a small valve body is provided in the central opening of the rotary valve, and these are relatively rotated so that the flow rate can be adjusted variously. This rotary valve is similar to a cock valve body. A main valve body, a small valve body built in the main valve body is a butterfly valve-shaped sub-valve body, and these two valve bodies are combined to form a double valve body, which has already been developed. It is known. (See Japanese Patent Publication No. 55-50595)
【０００５】[0005]
【発明が解決しようとする課題】上記した従来公知の弁
体二重構造の回転弁は、コックの弁体に類似した主弁体
を有する回転弁と、バタフライ弁状の副弁体とを合体し
た構造をなしており、主回転弁と副回転弁の複合特性に
より従来の２台の回転弁を直列に接続して２段階で行な
っていた減圧を、１台の回転弁で行なうことができるの
で、著しく簡単な配管構造にすることができ、また、設
置場所も少なくて済む。SUMMARY OF THE INVENTION The above-mentioned conventionally known rotary valve having a double valve body structure has a rotary valve having a main valve body similar to the valve body of a cock and a sub valve body in the form of a butterfly valve. Due to the combined characteristics of the main rotary valve and the sub rotary valve, the conventional two rotary valves can be connected in series to perform the depressurization in two stages, which can be performed by one rotary valve. Therefore, the piping structure can be remarkably simple, and the number of installation places can be reduced.
【０００６】しかしながら、このものにおいては、バタ
フライ弁状の副弁体が、コックの弁体に類似した主弁体
の流路内に設けられているので、該主弁体が閉弁してい
るときには、如何に副弁体を開閉動作しても流体は流れ
ず、従って、主弁体を開弁後に副弁体を開閉動作する必
要があるという問題点があった。However, in this structure, since the butterfly valve-shaped auxiliary valve body is provided in the flow path of the main valve body similar to the valve body of the cock, the main valve body is closed. In some cases, no matter how the sub-valve is opened and closed, the fluid does not flow. Therefore, it is necessary to open and close the sub-valve after opening the main valve.
【０００７】本発明は、上記した従来技術の問題点を解
決し、主弁体と副弁体の何れかを選択的に操作すること
により、小流量から中・大流量まで適宜使い分けを可能
に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 selectively operates either the main valve body or the sub-valve body, thereby making it possible to properly use from a small flow rate to a medium / large flow rate. The task is to do.
【０００８】[0008]
【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、請求項１の発明は、環状の本体に、その直径方向
位置に回動自在に軸支された主弁棒に結合され本体内部
流体通路に配された大径の主弁体と、本体内周面に張設
された弾性シートリングを備え、該シートリングの内周
面と前記主弁体外周面との接離により弁の開閉を行なう
中心型バタフライ弁において、前記主弁体の流体通路内
に小径の副弁体を設け、該副弁体を、前記主弁棒と同じ
直径方向位置に回動自在に軸支された副弁棒により回動
自在とし、これら主弁体と副弁体を流体の必要流量に応
じて自在に回動できるように前記主弁棒及び副弁棒を本
体の対向位置に突出構成したことを特徴としている。In order to solve the above-mentioned problems, the invention according to claim 1 is connected to an annular main body, which is connected to a main valve rod pivotally supported at its diametrical position. A large-diameter main valve body arranged in the internal fluid passage and an elastic seat ring stretched on the inner peripheral surface of the main body are provided, and the valve is formed by contact and separation between the inner peripheral surface of the seat ring and the outer peripheral surface of the main valve body. In a central butterfly valve that opens and closes, a small-diameter sub-valve is provided in the fluid passage of the main valve, and the sub-valve is rotatably supported at the same diametrical position as the main valve rod. The main valve body and the sub valve body are configured to project at opposite positions of the main body so that the main valve body and the sub valve body can freely rotate according to the required flow rate of fluid. It is characterized by that.
【０００９】また、請求項２の発明は、副弁体の外周面
又は該副弁体と接離する主弁体の内周面を、弾性体によ
って構成したことを特徴としている。The invention according to claim 2 is characterized in that the outer peripheral surface of the sub-valve body or the inner peripheral surface of the main valve body which comes into contact with and separates from the sub-valve body is made of an elastic body.
【００１０】また、請求項３の発明は、主弁棒及び副弁
棒にそれぞれ操作用アクチュエータを連結し、主弁体と
副弁体の回動順位を、流体の必要流量等に応じて選択可
能とし、小流量時の副弁のみの開閉使用、主弁体と副弁
体を一体として開閉する使用及び主弁体と副弁体を別々
に開閉する使用の三通りの使用を可能にしたことを特徴
としている。Further, according to the invention of claim 3, operating actuators are connected to the main valve rod and the sub valve rod, respectively, and the rotation order of the main valve body and the sub valve body is selected according to the required flow rate of the fluid or the like. It is possible to open and close only the sub valve at a small flow rate, to open and close the main valve body and the sub valve body as a unit, and to separately open and close the main valve body and the sub valve body. It is characterized by that.
【００１１】[0011]
【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
の一実施形態を示す中心形バタフライ弁の弁棒軸を含む
全閉状態を示す断面図である。BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a sectional view showing a fully closed state including a valve stem of a central butterfly valve according to an embodiment of the present invention.
【００１２】図において、環状の本体（弁本体）１の内
周面に、弾性シートリング２が張設され、該弾性シート
リング２の内周面と接離して主弁流体通路３を開閉、制
御する円板状の大径の主弁体４が、本体１に直径方向位
置に回動自在に軸支された主弁棒５に結合されており、
該主弁体４の中央部に、円筒状の副弁流体通路６が形成
されており、該副弁流体通路６を開閉制御する円板状の
小径の副弁体７が、該副弁流体通路６内に、上記主弁棒
５と同じ直径方向位置に回動自在に軸支された副弁棒８
に結合されている。In the figure, an elastic seat ring 2 is stretched around the inner peripheral surface of an annular main body (valve main body) 1, and the main valve fluid passage 3 is opened and closed by contacting and separating from the inner peripheral surface of the elastic seat ring 2. A disc-shaped large-diameter main valve body 4 to be controlled is connected to a main valve rod 5 which is rotatably supported by a main body 1 at a diametrical position.
A cylindrical auxiliary valve fluid passage 6 is formed in the center of the main valve body 4, and a disc-shaped small-diameter auxiliary valve body 7 for controlling the opening and closing of the auxiliary valve fluid passage 6 is formed by the auxiliary valve fluid. An auxiliary valve rod 8 rotatably supported in the same diametrical position as the main valve rod 5 in the passage 6.
Is joined to.
【００１３】上記副弁体７の外周面又は該副弁体７と接
離する主弁体４の内周面は、弾性体によって構成されて
おり、また、上記主弁棒５及び副弁棒８は、主弁体４及
び副弁体７の直径方向対向位置に取付けられて、何れも
本体１の対向位置から主弁用パッキン９及び副弁用パッ
キン１０を貫通して外方へ延長され、副弁棒８は、本体
１に固定された副弁棒ガイド１１に嵌入されて外方へ延
長され、他端は、主弁体４を介して主弁棒５の端部に案
内支持されている。The outer peripheral surface of the sub-valve body 7 or the inner peripheral surface of the main valve body 4 which comes into contact with and separates from the sub-valve body 7 is made of an elastic body, and the main valve rod 5 and the sub-valve rod are provided. 8 is attached to a diametrically opposed position of the main valve body 4 and the sub-valve body 7, and both extend outward from the opposed position of the main body 1 through the main valve packing 9 and the sub-valve packing 10. The sub-valve rod 8 is fitted into a sub-valve rod guide 11 fixed to the main body 1 and extended outward, and the other end is guided and supported by the end of the main valve rod 5 via the main valve body 4. ing.
【００１４】一方、主弁棒５は、上下二分式になってお
り、下部弁棒に相当するものが、上記本体１に固定され
た副弁棒ガイド１１であり、主弁体４の回動に伴ない該
副弁棒ガイド１１は回動しないのが特徴である。On the other hand, the main valve rod 5 is of an upper and lower bisecting type, and the one corresponding to the lower valve rod is the auxiliary valve rod guide 11 fixed to the main body 1, and the rotation of the main valve body 4. As a result, the auxiliary valve stem guide 11 does not rotate.
【００１５】また、上記主弁体４と主弁棒５とは、主弁
用テーパボルト４ａ（図には中心軸のみ示されてい
る。）によって一体化結合され、同様に副弁体７と副弁
棒８とは、副弁用テーパボルト７ａによって一体化結合
されており、これら主弁棒５及び副弁棒８の外方先端部
には、それぞれ主弁用植込キー１２及び副弁用植込キー
１３を介して、図示しない操作用アクチュエータが取付
けられ、これらの両操作用アクチュエータによって、両
弁棒５と８が自在に回動できるようになっている。The main valve body 4 and the main valve rod 5 are integrally connected by a main valve taper bolt 4a (only the central axis is shown in the drawing), and similarly, the sub valve body 7 and the sub valve body 7 are also subordinate to each other. The valve stem 8 is integrally coupled with the auxiliary valve taper bolt 7a, and the main valve stem 5 and the auxiliary valve stem 8 have outer ends which are respectively a main valve implant key 12 and a sub valve implant key. An operating actuator (not shown) is attached via the keypad 13, and both valve rods 5 and 8 can be freely rotated by these operating actuators.
【００１６】図２は、主弁体４と副弁体７の開閉状態を
示す説明図で、図において無地は全閉時を、また横線は
全開時を示す。そして図（Ａ）は、主弁体４と副弁体７
が共に全閉されている状態を示し、図（Ｂ）は、主弁体
４が全閉され、副弁体７のみが全開された状態を示し、
図（Ｃ）は、主弁体４が全開され、副弁体７が全閉され
た状態を示し、図（Ｄ）は、主弁体４と副弁体７が共に
全開されている状態を示している。FIG. 2 is an explanatory view showing the open / closed state of the main valve body 4 and the sub-valve body 7. In the figure, the solid line shows the fully closed state, and the horizontal line shows the fully opened state. And FIG. (A) shows the main valve body 4 and the sub valve body 7.
Shows a state in which both are fully closed, and FIG. 6B shows a state in which the main valve body 4 is fully closed and only the sub valve body 7 is fully opened.
The figure (C) shows the state where the main valve body 4 is fully opened and the sub valve body 7 is fully closed, and the figure (D) shows the state where both the main valve body 4 and the sub valve body 7 are fully opened. Shows.
【００１７】次に、作用について説明する。上記のよう
に、主弁体４と副弁体７は、主弁棒５と副弁棒８を介し
て、図示しない別個の操作用アクチュエータによって別
々に回動できるようになっているので、これらの両弁体
４と７は、大別して図２に示す四つの使用状態が考えら
れるが、実際上は、図２の（Ａ）（Ｂ）及び（Ｄ）の三
つの態様で使用される。Next, the operation will be described. As described above, the main valve body 4 and the sub valve body 7 can be separately rotated by the separate operating actuators (not shown) via the main valve rod 5 and the sub valve rod 8. The two valve bodies 4 and 7 can be roughly classified into four use states shown in FIG. 2, but in practice, they are used in the three modes of (A), (B) and (D) of FIG.
【００１８】図３は、主弁体４と副弁体７を連動して作
動したときの、両弁体の開度を横軸Ｘ1 ，Ｘ2 にとり、
通路断面積を縦軸Ｙにとって示した線図であって、試運
転時や本運転時等の最初の開弁時は、主弁体４を全閉し
た状態で副弁体７のみ開弁すると、図３の横軸Ｘ1 に示
す弁開度に応じて、Ａ曲線に沿って縦軸Ｙに示す開口断
面積が増加し、やがて、副弁体７の全開時（図２の
（Ｂ）に相当する。）において、図３のイ点の開口断面
積となり、該開口断面積に対応した小流量が流れる。つ
まり、このＡ曲線に沿った弁特性は、小流量時の弁特性
を示すものである。FIG. 3 shows the opening degrees of both valve bodies when the main valve body 4 and the sub valve body 7 are operated in conjunction with each other on the horizontal axes X 1 and X 2 .
It is a diagram showing the passage cross-sectional area on the vertical axis Y, and at the time of the first valve opening at the time of trial operation or main operation, when the main valve element 4 is fully closed and only the sub valve element 7 is opened, The opening cross-sectional area shown on the vertical axis Y increases along the curve A in accordance with the valve opening shown on the horizontal axis X 1 in FIG. 3, and eventually, when the sub valve body 7 is fully opened ((B) in FIG. 2). 3) corresponds to the opening cross-sectional area of the point A in FIG. 3, and a small flow rate corresponding to the opening cross-sectional area flows. That is, the valve characteristic along the A curve shows the valve characteristic at a small flow rate.
【００１９】次いで、図３の横軸Ｘ2 に示す弁開度に応
じて主弁体４を開口していくと、前記イ点に示す副弁体
７の開口断面積に、該主弁体４の開口断面積が加算さ
れ、Ｃ曲線に沿って開口断面積が増加し、やがて両弁体
の全開時（図２の（Ｄ）に相当する。）のロ点の最大開
口断面積となり、該開口断面積に対応した最大流量が流
れる。つまり、Ａ曲線とＣ曲線を連続して使用する場
合、小流量ないし中、大流量特性を示すものである。Next, when the main valve body 4 is opened in accordance with the valve opening shown on the horizontal axis X 2 in FIG. 3, the main valve body 4 is opened to the opening cross-sectional area of the sub-valve body 7 shown at the point a. The opening cross-sectional area of 4 is added, the opening cross-sectional area increases along the C curve, and eventually the maximum opening cross-sectional area of the point B at the time of full opening of both valve bodies (corresponding to (D) of FIG. 2) is obtained. The maximum flow rate corresponding to the opening cross-sectional area flows. That is, when the A curve and the C curve are continuously used, it shows a small flow rate to a medium flow rate characteristic.
【００２０】一方、主弁体４と副弁体７とが一体となっ
て回動するように、両アクチュエータを操作すると、図
３のＢ曲線に沿った弁特性を示す流量制御を行なうこと
ができる。この場合のＢ曲線は、主弁体４の直径を有す
る１枚の通常のバタフライ弁体に相当するものであり、
全開時の開口断面積ハ点は、前記したロ点の断面積に相
当する。On the other hand, if both actuators are operated so that the main valve body 4 and the sub valve body 7 rotate integrally, the flow rate control showing the valve characteristic along the curve B in FIG. 3 can be performed. it can. The B curve in this case corresponds to one normal butterfly valve element having the diameter of the main valve element 4,
The opening cross-sectional area C point when fully opened corresponds to the cross-sectional area of the above-mentioned point B.
【００２１】上記の実施の形態（実施例）によれば、次
の効果を奏することができる。 （ｉ）主弁４が、中、大口径（ほぼ口径２５０〜１２０
０ｍｍ）弁において、試運転時、本運転開始時の最初の
開弁時に直ちに開弁させると、二次側に流体圧力がない
ときは、一次側からの高流速、高差圧等により二次側の
配管系及び弁に異常を来たすことがあるため、通常は、
徐々に開弁させるようにしている。このような問題に対
処するために、従来、図４に示すように、弁本体（弁
箱）２１に内蔵される弁体２２を挟んで、上流側と下流
側にそれぞれ通水口２３，２４を形成し、これらの両通
水口を開閉弁２５を備えたバイパス管２６により連通さ
せるようにしたものが考案されている（実開昭６１−４
４０６９号公報参照）。これに対し、本発明は、上記バ
イパス弁２５に相当する小径の副弁体を内蔵した小口径
弁付の中・大口径弁ということができる。According to the above-described embodiment (example), the following effects can be obtained. (I) The main valve 4 has a medium or large diameter (approximately 250 to 120 in diameter).
(0 mm) valve, if the valve is opened immediately at the first valve opening at the time of trial operation and main operation start, when there is no fluid pressure on the secondary side, high flow velocity from the primary side, high differential pressure, etc. Since it may cause an abnormality in the piping system and valve of,
The valve is gradually opened. In order to deal with such a problem, conventionally, as shown in FIG. 4, a valve body 22 built in a valve body (valve box) 21 is sandwiched, and water passages 23 and 24 are provided on the upstream side and the downstream side, respectively. It has been devised that both of these water passages are made to communicate with each other by a bypass pipe 26 equipped with an on-off valve 25 (Actually, Sho 61-4).
No. 4069). On the other hand, the present invention can be said to be a medium- or large-diameter valve with a small-diameter valve that incorporates a small-diameter auxiliary valve body corresponding to the bypass valve 25.
【００２２】（ii）主弁体４及び副弁体７の閉弁時のシ
ール性は、弁体側又はシート側の何れかが弾性体で構成
され、該弾性体と金属剛体との圧接によって形成される
ので、確実な閉止が可能である。(Ii) The sealing performance of the main valve body 4 and the sub-valve body 7 when the valve is closed is formed by pressure contact between the elastic body and the metal rigid body, either the valve body side or the seat side is made of an elastic body. As a result, it can be securely closed.
【００２３】(iii) 通常バタフライ弁の場合、微小弁開
度（例３０％未満）で長期使用すると、流体条件により
キャビテーションによる損傷があり、これらを防止する
ために、小流量時には副弁を、又、中・大流量時には主
弁を併用して使用することにより、図３のＡ曲線、Ｂ曲
線及びＣ曲線に示す３通りの流量特性を有し、小流量か
ら中・大流量まで適宜使い分けが可能である。特に、上
記図３のＣ曲線においては、主弁体４の弁開度（横軸Ｘ
2 ）と開口断面積（縦軸Ｙ）の関係が、図５に示す従来
のバタフライ弁における開弁時の初期において弁開度の
割合に比較して流量が余り流れないという特性（例え
ば、３０％開度に対して流量は１０％内外）と比べて、
主弁体４の開弁時の初期において副弁体７が全開してい
るため、寧ろ図５における４５°傾斜したＤ線に近い傾
向を有するため、中・大流量範囲の流量調整が容易にな
る。(Iii) In the case of a normal butterfly valve, if it is used for a long time with a minute valve opening (eg, less than 30%), it may be damaged by cavitation due to fluid conditions. Also, by using the main valve together at the time of medium / large flow rate, it has three kinds of flow rate characteristics shown in A curve, B curve and C curve of Fig. 3, and can be used properly from small flow rate to medium / large flow rate. Is possible. Particularly, in the C curve of FIG. 3, the valve opening degree of the main valve body 4 (horizontal axis X
2 ) and the opening cross-sectional area (vertical axis Y) show that the conventional butterfly valve shown in FIG. 5 has a characteristic that the flow rate does not flow much compared to the rate of the valve opening at the initial stage of opening (for example, 30 The flow rate is 10% inside / outside relative to% opening)
Since the sub valve body 7 is fully opened in the initial stage of opening the main valve body 4, it tends to be close to the D line inclined at 45 ° in FIG. Become.
【００２４】（iv）主弁棒５及び副弁棒８の弁外突出端
が、共に本体１に対して対向位置にあるため、操作誤り
がなく、使用の利便性がある。(Iv) Since both the valve outer protruding ends of the main valve rod 5 and the sub valve rod 8 are located opposite to the main body 1, there is no operation error and there is convenience in use.
【００２５】（ｖ）弁の開閉及び制御を手動又は自動操
作によって行なうことが可能であり、前記した当該バタ
フライ弁１台で、小流量時の副弁７のみの開閉使用と、
主弁体４と副弁体７を一体として開閉する使用と、主弁
体４と副弁体７を別々に開閉する使用の３通りの使用が
可能であり、小流量から大流量まで、キャビテーション
の発生を防止し、騒音、振動の発生防止を可能にしてい
る。(V) It is possible to open and close and control the valve manually or automatically. With the above-mentioned one butterfly valve, only the auxiliary valve 7 is opened and closed when the flow rate is small,
It can be used in three ways, one for opening and closing the main valve body 4 and the sub-valve body 7 as a unit, and one for opening and closing the main valve body 4 and the sub-valve body 7 separately. To prevent noise and vibration.
【００２６】上記した実施形態において、両弁棒５と８
を操作用アクチュエータによって駆動する構造について
説明したが、手動操作に代えることも可能である。In the above embodiment, both valve rods 5 and 8
Although the structure in which the actuator is driven by the operating actuator has been described, it may be replaced by manual operation.
【００２７】[0027]
【発明の効果】以上説明したように、本発明によれば、
請求項１の発明においては、環状の本体に、その直径方
向位置に回動自在に軸支された主弁棒に結合され本体内
部流体通路に配された大径の主弁体と、本体内周面に張
設された弾性シートリングを備え、該シートリングの内
周面と前記主弁体外周面との接離により弁の開閉を行な
う中心型バタフライ弁において、前記主弁体の流体通路
内に小径の副弁体を設け、該副弁体を、前記主弁棒と同
じ直径方向位置に回動自在に軸支された副弁棒により回
動自在とし、これら主弁体と副弁体を流体の必要流量に
応じて自在に回動できるように前記主弁棒及び副弁棒を
本体の対向位置に突出構成したことにより、最初の開弁
時において主弁体を全閉状態にし小径の副弁体のみを開
弁させることができるので、開弁時におけるキャビテー
ション等の発生を防止することができるばかりでなく、
主弁体と副弁体の回動順位を流体の必要流量等に応じて
選択して、小流量から中・大流量まで適宜使い分けるこ
とが可能である。As described above, according to the present invention,
In the invention of claim 1, a large-diameter main valve body, which is connected to a main valve rod rotatably supported at a diametrical position of the main body and is arranged in a fluid passage inside the main body, In a central butterfly valve having an elastic seat ring stretched around a peripheral surface, the valve body being opened and closed by contact and separation between an inner peripheral surface of the seat ring and an outer peripheral surface of the main valve body, a fluid passage of the main valve body. A sub-valve body having a small diameter is provided therein, and the sub-valve body is made rotatable by a sub-valve body rotatably supported at the same diametrical position as the main valve body. Since the main valve rod and the sub-valve rod are configured so as to project to opposite positions of the main body so that the body can freely rotate according to the required flow rate of fluid, the main valve body is fully closed at the time of the first valve opening. Since only the small-diameter sub-valve can be opened, cavitation etc. will not occur when the valve is opened. Not only it can be stopped,
It is possible to select the rotation order of the main valve body and the sub-valve body according to the required flow rate of the fluid, etc., and properly use them from a small flow rate to a medium / large flow rate.
【００２８】また、請求項２の発明においては、副弁体
の外周面又は該副弁体と接離する主弁体の内周面を弾性
体によって構成したことにより、主弁体及び副弁体の閉
止時のシール性を確保することができる。Further, in the invention of claim 2, the outer peripheral surface of the sub-valve body or the inner peripheral surface of the main valve body which comes into contact with and separates from the sub-valve body is made of an elastic body. It is possible to secure the sealing property when the body is closed.
【図１】本発明の一実施形態を示す中心形バタフライ弁
の弁棒軸を含む全閉状態の断面図である。FIG. 1 is a sectional view of a central butterfly valve according to an embodiment of the present invention in a fully closed state including a valve stem.
【図２】（Ａ）〜（Ｄ）は主弁体及び副弁体の開閉状態
を示す説明図である。2 (A) to (D) are explanatory views showing open / closed states of a main valve body and a sub valve body.
【図３】主弁及び副弁を連動して使用するときの弁開度
を横軸とし開口断面積を縦軸として示した線図である。FIG. 3 is a diagram showing the valve opening degree when the main valve and the sub valve are used in conjunction with each other and the opening cross-sectional area as the vertical axis.
【図４】従来例を示すバイパス弁を有するバタフライ弁
の側面図である。FIG. 4 is a side view of a butterfly valve having a bypass valve showing a conventional example.
【図５】弁の流量特性図である。FIG. 5 is a flow rate characteristic diagram of a valve.
１ 本体 ２ 弾性シートリング ３ 主弁流体通路 ４ 主弁体 ５ 主弁棒 ６ 副弁流体通路 ７ 副弁体 ８ 副弁棒 ９ 主弁用パッキン １０ 副弁用パッキン １１ 副弁棒ガイド １２ 主弁用植込キー １３ 副弁用植込キー 1 main body 2 elastic seat ring 3 main valve fluid passage 4 main valve body 5 main valve rod 6 auxiliary valve fluid passage 7 auxiliary valve body 8 auxiliary valve rod 9 main valve packing 10 auxiliary valve packing 11 auxiliary valve rod guide 12 main valve Implantation Key 13 Sub-valve Implantation Key
Claims (3)
自在に軸支された主弁棒に結合され本体内部流体通路に
配された大径の主弁体と、本体内周面に張設された弾性
シートリングを備え、該シートリングの内周面と前記主
弁体外周面との接離により弁の開閉を行なう中心型バタ
フライ弁において、前記主弁体の流体通路内に小径の副
弁体を設け、該副弁体を、前記主弁棒と同じ直径方向位
置に回動自在に軸支された副弁棒により回動自在とし、
これら主弁体と副弁体を流体の必要流量に応じて自在に
回動できるように前記主弁棒及び副弁棒を、本体の対向
位置に突出構成したことを特徴とする主弁と副弁を有す
るバタフライ弁。1. A large-diameter main valve body, which is connected to a main valve rod rotatably supported at its diametrical position in an annular main body and is arranged in a fluid passage inside the main body, and an inner peripheral surface of the main body. In a central butterfly valve that is provided with a stretched elastic seat ring and opens and closes the valve by contacting and separating the inner peripheral surface of the seat ring and the outer peripheral surface of the main valve body, a small diameter inside the fluid passage of the main valve body. A sub-valve body is provided, and the sub-valve body is made rotatable by a sub-valve body that is pivotally supported at the same diametrical position as the main valve stem.
A main valve and a sub valve, characterized in that the main valve rod and the sub valve rod are configured to project at opposite positions of the main body so that the main valve body and the sub valve body can freely rotate according to a required flow rate of fluid. Butterfly valve with valve.
主弁体の内周面を、弾性体によって構成したことを特徴
とする請求項１記載の主弁体と副弁を有するバタフライ
弁。2. The main valve body and the sub valve according to claim 1, wherein an outer peripheral surface of the sub valve body or an inner peripheral surface of the main valve body which comes into contact with and separates from the sub valve body is made of an elastic body. Butterfly valve with.
チュエータを連結し、主弁体と副弁体の回動順位を、流
体の必要流量等に応じて選択可能とし、小流量時の副弁
のみの開閉使用、主弁体と副弁体を一体として開閉する
使用及び主弁体と副弁体を別々に開閉する使用の三通り
の使用を可能にしたことを特徴とする請求項１又は請求
項２記載の主弁と副弁を有するバタフライ弁。3. An operation actuator is connected to each of the main valve stem and the sub valve stem, so that the turning order of the main valve disc and the sub valve disc can be selected according to the required flow rate of the fluid and the like. Claims characterized by enabling three ways of use: opening and closing only the sub-valve, opening and closing the main valve body and the sub-valve integrally, and separately opening and closing the main valve body and the sub-valve body. A butterfly valve having the main valve and the auxiliary valve according to claim 1 or claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19466795A JPH0942533A (en) | 1995-07-31 | 1995-07-31 | Butterfly valve having main valve and auxiliary valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19466795A JPH0942533A (en) | 1995-07-31 | 1995-07-31 | Butterfly valve having main valve and auxiliary valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0942533A true JPH0942533A (en) | 1997-02-14 |
Family
ID=16328312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19466795A Pending JPH0942533A (en) | 1995-07-31 | 1995-07-31 | Butterfly valve having main valve and auxiliary valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0942533A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017164742A (en) * | 2016-03-17 | 2017-09-21 | 江原道 | Power type direct injection spray device for fruit tree flower picking |
| CN109780228A (en) * | 2019-03-06 | 2019-05-21 | 上海发电设备成套设计研究院有限责任公司 | A kind of butterfly valve carrying adjustable internal bypass |
-
1995
- 1995-07-31 JP JP19466795A patent/JPH0942533A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017164742A (en) * | 2016-03-17 | 2017-09-21 | 江原道 | Power type direct injection spray device for fruit tree flower picking |
| CN109780228A (en) * | 2019-03-06 | 2019-05-21 | 上海发电设备成套设计研究院有限责任公司 | A kind of butterfly valve carrying adjustable internal bypass |
| CN109780228B (en) * | 2019-03-06 | 2023-10-17 | 上海发电设备成套设计研究院有限责任公司 | Butterfly valve with adjustable internal bypass |
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