JPH109404A - Butterfly valve - Google Patents

Butterfly valve

Info

Publication number
JPH109404A
JPH109404A JP18657296A JP18657296A JPH109404A JP H109404 A JPH109404 A JP H109404A JP 18657296 A JP18657296 A JP 18657296A JP 18657296 A JP18657296 A JP 18657296A JP H109404 A JPH109404 A JP H109404A
Authority
JP
Japan
Prior art keywords
valve
thrust
nut
bolt
valve body
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
JP18657296A
Other languages
Japanese (ja)
Other versions
JP3084234B2 (en
Inventor
Yoshinori Yurugi
義則 万木
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 JP08186572A priority Critical patent/JP3084234B2/en
Publication of JPH109404A publication Critical patent/JPH109404A/en
Application granted granted Critical
Publication of JP3084234B2 publication Critical patent/JP3084234B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To regulate a compressive rate of the valve seat of a valve element from one direction by arranging a thrust nut screwed around a thrust bolt fixed on a lower valve rod on the lower part of a valve main body, supporting the nut by a thrust receiver, and regulating the position of the valve element by relative rotation of the bolt and the nut. SOLUTION: In the end part of a lower valve rod 5, a thrust bolt 13 screwed in a thrust nut is integratedly fixed, and the lower valve rod 5, a valve element 2, and an upper valve rod 4 are simultaneously moved up and down by relative rotation of the nut. The lower valve rod 5 is moved up and down by relative rotation of the nut and the bolt 13, and the nut and the bolt 13 are fixed by using a roll pin so as to stop rotation. Since up and down motion of the lower valve rod 5 is not carried out through the bolt 13 by fixing a cap 7, up and down motion of the valve element 2 is not carried out, and opening/closing and rotation of the valve are enabled stably.

Description

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

【0001】[0001]

【発明の属する分野】この発明は、バタフライ弁、特に
弁体の位置を調整可能とした中・大口径のバタフライ弁
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve, and more particularly to a butterfly valve of a medium or large diameter which can adjust the position of a valve body.

【0002】[0002]

【従来の技術】従来、中・大口径のバタフライ弁は弁本
体、弁体、シートリング各部及び弁体の軸心に対する偏
心等の加工誤差は避けることが出来なかった。特に、軸
心の偏心は、弁全閉時に弁体が弁座に均等に当接しなく
なる結果、弁座部からの流体の漏洩並びに弁操作力の増
大を来す問題があった。
2. Description of the Related Art Conventionally, machining errors such as eccentricity with respect to a valve body, a valve body, various parts of a seat ring, and an axis of a valve body cannot be avoided in a medium / large diameter butterfly valve. In particular, the eccentricity of the shaft center has a problem in that the valve body does not evenly contact the valve seat when the valve is fully closed, resulting in leakage of fluid from the valve seat and an increase in valve operating force.

【0003】軸心に対する偏心を防止するために、、パ
ッキン押さえの外端面を鋼球を介して弁軸受に取り付
け、パッキンや座金の枚数や厚みを変えることにより、
弁棒の取付位置を軸方向に調節するようにしたものが実
公昭44−2615号公報に開示されている。又実公昭
45−26544号公報には、弁本体のボス部と螺合す
るゴム軸受により、弁棒の自動調心を行うと共に、弁軸
方向への流体の漏洩を防止するようにしたものが開示さ
れている。
In order to prevent eccentricity with respect to the shaft center, the outer end surface of the packing retainer is attached to a valve bearing via a steel ball, and the number and thickness of the packing and washers are changed.
Japanese Patent Publication No. 44-2615 discloses an arrangement in which the mounting position of the valve stem is adjusted in the axial direction. Japanese Utility Model Publication No. 45-26544 discloses a rubber bearing which is screwed to a boss of a valve body to automatically align a valve stem and to prevent fluid leakage in the valve axis direction. It has been disclosed.

【0004】しかしながら、これらの公報に開示された
ものは、いずれも弁本体の上下の弁軸筒部からの弁軸受
けの締付により、すなわち二方向からの締付による調整
であるため、弁軸筒部の構成が大型となり、しかも弁軸
受け部材が複数個必要となる欠点があった。又、いずれ
の構造も弁軸の上下動を調整するものではなく、パッキ
ンの締付により弁体の軸方向の取付位置を調節するもの
であった。
[0004] However, in all of the publications disclosed in these publications, the adjustment is performed by tightening the valve bearings from the upper and lower valve shaft cylinders of the valve body, that is, by adjusting the valve shaft from two directions. There has been a drawback that the configuration of the cylindrical portion becomes large and that a plurality of valve bearing members are required. Further, none of the structures adjusts the vertical movement of the valve shaft, but adjusts the mounting position of the valve body in the axial direction by tightening the packing.

【0005】[0005]

【発明が解決しようとする課題】この発明は、中・大口
径のバタフライ弁の弁体の弁座に対する圧縮量を一方向
から調整可能として、弁全閉時における弁座からの漏れ
がないようにすると共に、一対の上下スラスト受けによ
り弁体の自重を受けて、弁座に負担させないようにし
て、弁体の回転を円滑し、且弁座からの漏れをなくすよ
うにせんとするものである。
SUMMARY OF THE INVENTION The present invention makes it possible to adjust the amount of compression of a valve body of a middle / large-diameter butterfly valve against a valve seat from one direction so that there is no leakage from the valve seat when the valve is fully closed. In addition, the valve body receives its own weight by a pair of upper and lower thrust receivers, so that the valve seat is not burdened, the rotation of the valve body is smooth, and leakage from the valve seat is eliminated. is there.

【0006】[0006]

【課題を解決するための手段】上記課題を解決するため
にこの発明が採った手段は、弁体を軸支する下部弁棒に
スラストボルトを固定し、該スラストボルトが螺合する
スラストナットを弁本体の下部に配置し、スラストナッ
トをスラスト受けで支持して、スラストボルトとスラス
トナットの相対的回転により、弁体の位置を調整するよ
うにしたことを特徴とする。
In order to solve the above-mentioned problems, the present invention adopts a method in which a thrust bolt is fixed to a lower valve stem which supports a valve body, and a thrust nut to which the thrust bolt is screwed is attached. The thrust nut is supported by a thrust receiver at a lower portion of the valve body, and the position of the valve body is adjusted by the relative rotation of the thrust bolt and the thrust nut.

【0007】又、スラスト受けに潤滑剤孔を形成し、該
潤滑剤孔に充填した潤滑剤をポンピング作用により回転
接触面に給油するようにしたことを特徴とする。
Further, a lubricant hole is formed in the thrust receiver, and the lubricant filled in the lubricant hole is supplied to the rotary contact surface by a pumping action.

【0008】更に、スラストナットの上下両面にスラス
ト受けを配置すると共に、弁棒を軸支する弁本体の弁棒
挿入孔内に軸受を配置し、弁の正立・倒立並びに垂直・
水平の配置を可能としたことを特徴とする。
Further, a thrust receiver is disposed on both upper and lower surfaces of a thrust nut, and a bearing is disposed in a valve rod insertion hole of a valve body which supports a valve rod.
It is characterized in that horizontal arrangement is possible.

【0009】[0009]

【発明の実施の形態】この発明の好ましい実施の形態
を、以下に詳細に説明する。図1は、この発明を適用し
た中・大口径の偏心型バタフライ弁を示しているが、こ
の発明は偏心型バタフライ弁に限定されるものではな
く、中心型バタフライ弁にも同様に適用可能であること
は勿論である。通常、口径が350mmを超える中・大口
径のバタフライ弁においては、弁体の自重により弁体が
軸方向に下降して弁体の下方に荷重が付加される結果、
弁座の下方部に特に大きな圧接力が掛かって来ると共
に、逆に弁座の上方部における圧接力が小となり、シー
ル性が低下して来るため、流体が二次側に漏洩するおそ
れがあった。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below. FIG. 1 shows an eccentric butterfly valve of a medium / large diameter to which the present invention is applied. However, the present invention is not limited to an eccentric butterfly valve, and is similarly applicable to a center type butterfly valve. Of course there is. Normally, in a butterfly valve having a middle diameter and a large diameter exceeding 350 mm, as a result of the valve body descending in the axial direction due to the weight of the valve body and a load being applied below the valve body,
A particularly large pressing force is applied to the lower part of the valve seat, and conversely, the pressing force at the upper part of the valve seat is reduced and the sealing performance is reduced, so that the fluid may leak to the secondary side. Was.

【0010】これを防止するには、弁体の下降を防止す
る構造、手段が必要となる。前記実公昭44−2615
号公報に開示のバタフライ弁は、偏心型バタフライ弁で
あり、弁体の自重をパッキンとパッキン押さえとで受け
る構造の軸封装置である。又、実公昭45−26544
号公報に開示のバタフライ弁は、中心型バタフライ弁で
あり、ゴムライニングの面部分と弁体とを面接触させる
軸封構造である。この種の軸封装置は、中・大口径のバ
タフライ弁に汎用されており、軸封部すなわちグランド
方向(弁軸方向)からの流体の漏洩防止、弁体の下降防
止、軸封部パッキンの摩耗防止を目的としており、外部
から容易に弁軸位置の調整が可能であること、長期にわ
たって安定した回動力を発揮することが要求される。
In order to prevent this, a structure and means for preventing the valve body from lowering are required. 44-615
The butterfly valve disclosed in Japanese Patent Laid-Open Publication No. H10-146131 is an eccentric butterfly valve, and is a shaft sealing device having a structure in which the weight of a valve body is received by a packing and a packing presser. Also, Shoko 45-26544
The butterfly valve disclosed in the above publication is a center type butterfly valve, and has a shaft sealing structure in which a surface portion of a rubber lining comes into surface contact with a valve body. This type of shaft sealing device is widely used for medium and large diameter butterfly valves, and prevents leakage of fluid from a shaft sealing portion, that is, a gland direction (valve shaft direction), prevention of a valve body from descending, and packing of a shaft sealing portion. For the purpose of preventing wear, it is required that the position of the valve shaft can be easily adjusted from the outside and that a stable rotating power is exhibited for a long period of time.

【0011】図面を参照して、弁本体(1)の内周面の一
部に弁座(3)を固着し、その内接円に当接するように弁
体(2)が、弁棒(4)(5)で軸支される。弁体(2)と弁棒
(4)(5)は、テーパーボルト(10)と六角ナット(11)で固
定され一体化されている。上部弁棒(4)は、弁本体(1)
の上部から外方に伸び出し、端部に所定のアクチュエー
タが連結され、駆動回転される。アクチュエータとの連
結のために、上部弁棒(4)の外端には植込キー(12)が設
けられている。アクチュエータからの駆動力により上部
弁棒(4)を介して弁体(2)が回動され、弁座(3)と接離
して弁の開閉が行われる。
Referring to the drawings, a valve seat (3) is fixed to a part of the inner peripheral surface of a valve body (1), and a valve body (2) is attached to a valve stem ( 4) It is supported by (5). Valve body (2) and stem
(4) and (5) are fixed and integrated with a taper bolt (10) and a hexagon nut (11). The upper stem (4) is the valve body (1)
A predetermined actuator is connected to an end portion and is driven to rotate. An implantation key (12) is provided at the outer end of the upper valve stem (4) for connection with the actuator. The valve body (2) is rotated via the upper valve stem (4) by the driving force from the actuator, and the valve is opened and closed by coming into contact with and separating from the valve seat (3).

【0012】弁本体(1)の弁棒挿通孔の内面には、軸受
(8)(9)が挿設される。軸受部材としては、青銅、ポリ
テトラフルオロエチレン系、合成樹脂系のもので、対摩
耗性、潤滑性に優れた材料が用いられる。上部軸受(8)
の端部には、パッキン(16)がパッキン受けに支持されつ
つ配置され、固定用ボルトで弁本体(1)の上部に固定さ
れる押え板(14)で取り付けられている。下部軸受(9)の
端部には、外部漏洩防止用のOリング(22)を介して底蓋
(6)がボルト(24)で固定されている。底蓋(6)の外方に
は、Oリング(23)を介してキャップ(7)がボルト(25)で
固定される。
A bearing is provided on the inner surface of the valve rod insertion hole of the valve body (1).
(8) and (9) are inserted. The bearing member is made of bronze, polytetrafluoroethylene, or a synthetic resin, and is made of a material having excellent wear resistance and lubricity. Upper bearing (8)
A packing (16) is arranged at an end of the valve body while being supported by a packing receiver, and is attached by a holding plate (14) fixed to an upper portion of the valve body (1) with fixing bolts. At the end of the lower bearing (9), an O-ring (22) for preventing external leakage
(6) is fixed with bolts (24). Outside the bottom cover (6), a cap (7) is fixed with a bolt (25) via an O-ring (23).

【0013】下部弁棒(5)の端部には、スラストナット
(20)に螺合したスラストボルト(13)が一体に固定されて
おり、スラストナット(20)との相対的な回転により、下
部弁棒(5)、従って弁体(2)と上部弁棒(4)を同時に上
下動することが出来る。そして、スラストナット及びボ
ルトの相対的回転により下部弁棒(5)を上下動して、弁
体(2)を適正位置、すなわち弁座テストにおいて流体が
漏洩しないことを確認した位置において、スラストナッ
ト(20)とスラストボルト(13)にキリ孔を加工しロールピ
ン(21)を打ち込んで両者を固定し、回転を止める。前記
キャップ(7)が、上下のスラスト受(18)(19)とスラスト
ナット(20)を被覆する深さを有していることは勿論であ
る。従って、キャップ(7)を固定することにより、スラ
ストボルトを介した下部弁棒の上下動を行うことが出来
なくなるため、弁体(2)は上下動せず安定した弁の開閉
及び回動が可能となる。
A thrust nut is provided at the end of the lower valve stem (5).
A thrust bolt (13) screwed to (20) is fixed integrally, and by relative rotation with the thrust nut (20), the lower valve stem (5), that is, the valve body (2) and the upper valve stem are rotated. (4) can be moved up and down at the same time. The lower valve stem (5) is moved up and down by the relative rotation of the thrust nut and the bolt, and the valve body (2) is moved to the proper position, that is, the thrust nut at the position where it is confirmed that fluid does not leak in the valve seat test. A drill hole is formed in (20) and the thrust bolt (13), and a roll pin (21) is driven in to fix the two, and the rotation is stopped. Needless to say, the cap (7) has a depth to cover the upper and lower thrust receivers (18) and (19) and the thrust nut (20). Therefore, by fixing the cap (7), the lower valve stem cannot be moved up and down via the thrust bolt, so that the valve body (2) does not move up and down, and stable opening and closing and rotation of the valve can be achieved. It becomes possible.

【0014】図6〜10は、スラスト受け(18)(19)の一
例を示す。スラスト受けは、スラストナット(20)の上下
面に配置されスラストナットの円滑な回転を保障するた
めの円板状の部材であって、図6、7に示すように潤滑
剤を充填する円形の潤滑剤孔(26)が形成されており、該
潤滑剤孔に充填された潤滑剤により、スラストナットの
潤滑が図られる。充填される潤滑剤は、一般的にはグリ
ース系の潤滑剤が用いられる。スラスト受けの幅が広い
場合(スラスト受けの内外径差が大なる場合)には、図
8に示すように異なった同心円上に更に潤滑剤孔(26')
を形成して、潤滑剤の拡散範囲を拡大する。図9、10
に示すスラスト受けは、潤滑剤孔(26)の形状を楕円形に
形成すると共に、潤滑剤孔を溝(27)で相互に連結したも
のであり、潤滑剤の拡散をより良好にすることが出来
る。尚、スラスト受けの形状、構造並びに潤滑剤孔の形
状、構造、数等は、図示のものに限定されないことは勿
論である。
6 to 10 show an example of the thrust receivers (18) and (19). The thrust receiver is a disk-shaped member disposed on the upper and lower surfaces of the thrust nut (20) to ensure smooth rotation of the thrust nut. As shown in FIGS. A lubricant hole (26) is formed, and the lubricant filled in the lubricant hole lubricates the thrust nut. As a lubricant to be filled, a grease-based lubricant is generally used. In the case where the width of the thrust receiver is wide (when the difference between the inner and outer diameters of the thrust receiver is large), as shown in FIG.
To increase the diffusion range of the lubricant. 9 and 10
The thrust receiver shown in Fig. 1 is formed by forming the shape of the lubricant hole (26) into an elliptical shape and interconnecting the lubricant holes by the grooves (27), which makes it possible to improve the diffusion of the lubricant. I can do it. The shape and structure of the thrust receiver and the shape, structure and number of the lubricant holes are not limited to those shown in the drawings.

【0015】下部弁棒(5)の回転により、これに固定さ
れたスラストボルトを介してスラストナット(20)も同様
に回転する。スラストナット(20)の下面と下部スラスト
受け(19)の上面が面接触しているため、回動により潤滑
剤孔(26)に充填された潤滑剤が回動熱によるポンピング
作用で面接触部に給油され、円滑な回転が保障される。
By the rotation of the lower valve stem (5), the thrust nut (20) is similarly rotated via a thrust bolt fixed thereto. Since the lower surface of the thrust nut (20) and the upper surface of the lower thrust receiver (19) are in surface contact, the lubricant filled in the lubricant hole (26) by rotation causes the lubricant to fill the surface contact portion by the pumping action of the rotation heat. To ensure smooth rotation.

【0016】[0016]

【発明の効果】この発明によれば、弁本体下部に設けら
れた弁体調整装置により、弁体の弁座に対する圧縮量を
最適なものに調整することが出来、構造が簡単で弁軸方
向からの調整をすることが出来る。
According to the present invention, the amount of compression of the valve body with respect to the valve seat can be adjusted to an optimum value by the valve body adjusting device provided at the lower portion of the valve body, so that the structure is simple and the valve axial direction is improved. Can be adjusted.

【0017】又、上下のスラスト受けにより、弁体の回
動に伴う回動力の円滑化と安定化を潤滑剤孔からのポン
ピング作用で給油される潤滑剤で行うことが出来る。
[0017] Further, by the upper and lower thrust receivers, the smoothness and stabilization of the turning force accompanying the rotation of the valve element can be performed by the lubricant supplied by the pumping action from the lubricant hole.

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

【図1】この発明にかかる弁体調整装置を適用したバタ
フライ弁の縦断面図
FIG. 1 is a longitudinal sectional view of a butterfly valve to which a valve element adjusting device according to the present invention is applied.

【図2】同バタフライ弁の正面図FIG. 2 is a front view of the butterfly valve.

【図3】図1A部分の拡大断面図FIG. 3 is an enlarged sectional view of FIG. 1A part;

【図4】弁体調整装置の分解斜視図FIG. 4 is an exploded perspective view of the valve element adjusting device.

【図5】スラストボルト、ナット並びにスラスト受けの
分解斜視図
FIG. 5 is an exploded perspective view of a thrust bolt, a nut, and a thrust receiver.

【図6】スラスト受けの一例を示す平面図FIG. 6 is a plan view showing an example of a thrust receiver.

【図7】図6B−B’線に沿った断面図FIG. 7 is a sectional view taken along the line B-B 'of FIG. 6;

【図8】スラスト受けの他の例を示す平面図FIG. 8 is a plan view showing another example of the thrust receiver.

【図9】スラスト受けの更に他の例を示す平面図FIG. 9 is a plan view showing still another example of the thrust receiver.

【図10】図9C−C’線に沿った断面図FIG. 10 is a sectional view taken along the line C-C 'of FIG. 9;

【符号の説明】[Explanation of symbols]

(1)弁本体 (2)弁体 (3)弁座 (4)上部弁棒 (5)下部弁棒 (6)底蓋 (7)キャップ (8)上部軸受 (9)下部軸受 (10)テーパーボルト (11)六角ナット (12)植込キー (13)スラストボルト (14)押え板 (16)パッキン (18)上部スラスト受け (19)下部スラスト受け (20)スラストナット (21)ロールピン (22)Oリング (23)Oリング (24)ボルト (25)ボルト (26)潤滑剤孔 (27)溝 (1) Valve body (2) Valve body (3) Valve seat (4) Upper valve stem (5) Lower valve stem (6) Bottom lid (7) Cap (8) Upper bearing (9) Lower bearing (10) Taper Bolt (11) Hex nut (12) Stud key (13) Thrust bolt (14) Holding plate (16) Packing (18) Upper thrust receiver (19) Lower thrust receiver (20) Thrust nut (21) Roll pin (22) O-ring (23) O-ring (24) Bolt (25) Bolt (26) Lubricant hole (27) Groove

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】弁体を軸支する下部弁棒にスラストボルト
を固定し、該スラストボルトが螺合するスラストナット
を弁本体の下部に配置し、スラストナットをスラスト受
けで支持して、スラストボルトとスラストナットの相対
的回転により、弁体の位置を調整するようにしたことを
特徴とするバタフライ弁。
A thrust bolt is fixed to a lower valve stem which supports a valve body, a thrust nut to which the thrust bolt is screwed is arranged at a lower portion of the valve body, and the thrust nut is supported by a thrust receiver. A butterfly valve wherein the position of a valve body is adjusted by the relative rotation of a bolt and a thrust nut.
【請求項2】スラスト受けに潤滑剤孔を形成し、該潤滑
剤孔に充填した潤滑剤をポンピング作用により回転接触
面に給油するようにしたことを特徴とする請求項1記載
のバタフライ弁。
2. The butterfly valve according to claim 1, wherein a lubricant hole is formed in the thrust receiver, and the lubricant filled in the lubricant hole is supplied to the rotating contact surface by a pumping action.
【請求項3】スラストナットの上下両面にスラスト受け
を配置すると共に、弁棒を軸支する弁本体の弁棒挿入孔
内に軸受を配置し、弁の正立・倒立並びに垂直・水平の
配置を可能としたことを特徴とする請求項1又は2記載
のバタフライ弁。
3. A thrust nut is disposed on both upper and lower surfaces of a thrust nut, and a bearing is disposed in a valve rod insertion hole of a valve body which supports a valve rod. The butterfly valve according to claim 1 or 2, wherein:
JP08186572A 1996-06-27 1996-06-27 Butterfly valve Expired - Fee Related JP3084234B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08186572A JP3084234B2 (en) 1996-06-27 1996-06-27 Butterfly valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08186572A JP3084234B2 (en) 1996-06-27 1996-06-27 Butterfly valve

Publications (2)

Publication Number Publication Date
JPH109404A true JPH109404A (en) 1998-01-13
JP3084234B2 JP3084234B2 (en) 2000-09-04

Family

ID=16190890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP08186572A Expired - Fee Related JP3084234B2 (en) 1996-06-27 1996-06-27 Butterfly valve

Country Status (1)

Country Link
JP (1) JP3084234B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102242811A (en) * 2011-06-29 2011-11-16 安徽铜都阀门股份有限公司 Expansion sleeve taper pin butterfly valve
CN104405898A (en) * 2014-11-24 2015-03-11 河南煜达阀门制造有限公司 Low-maintenance-rate triple-eccentric butterfly valve
CN105673871A (en) * 2014-11-18 2016-06-15 天津澳特斯阀门制造有限公司 Multifunctional butterfly valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102242811A (en) * 2011-06-29 2011-11-16 安徽铜都阀门股份有限公司 Expansion sleeve taper pin butterfly valve
CN105673871A (en) * 2014-11-18 2016-06-15 天津澳特斯阀门制造有限公司 Multifunctional butterfly valve
CN104405898A (en) * 2014-11-24 2015-03-11 河南煜达阀门制造有限公司 Low-maintenance-rate triple-eccentric butterfly valve

Also Published As

Publication number Publication date
JP3084234B2 (en) 2000-09-04

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