JPH0732263U - Metal seat butterfly valve seat structure - Google Patents
Metal seat butterfly valve seat structureInfo
- Publication number
- JPH0732263U JPH0732263U JP6292393U JP6292393U JPH0732263U JP H0732263 U JPH0732263 U JP H0732263U JP 6292393 U JP6292393 U JP 6292393U JP 6292393 U JP6292393 U JP 6292393U JP H0732263 U JPH0732263 U JP H0732263U
- Authority
- JP
- Japan
- Prior art keywords
- seat
- valve
- metal
- valve body
- piece
- 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
Links
Landscapes
- Lift Valve (AREA)
Abstract
(57)【要約】
【目的】 径方向の外形寸法が一定に制約されているも
のでも、メタルシートの撓み量を大きくとれて、全閉位
置の弁体のシート表面に対する密着性の向上を図れるよ
うにする。
【構成】 円筒形弁箱１の内周面に形成された環状凹所
６内に、メタルシート７を弁座として装着したメタルシ
ートバタフライ弁において、上記弁箱１の軸心に沿った
断面形状が略Ｕ字形のシート片８（１８），９（１９）
を上記弁箱の径方向で複数段に配設するとともに、互い
に折り返し状に連結して上記メタルシート７を構成し、
初段のシート片８（１８）の基端部８ａ（１８ａ）を上
記弁箱１に支持させる一方、終段のシート片９（１９）
の先端部９ｂ（１９ｂ）を上記弁体側シート表面５に弾
性的に接触する接触部に構成している。
(57) [Abstract] [Purpose] Even if the outer dimension in the radial direction is constrained to a certain extent, the amount of bending of the metal seat can be increased, and the adhesion of the valve body in the fully closed position to the seat surface can be improved. To do so. A metal seat butterfly valve in which a metal seat 7 is mounted as a valve seat in an annular recess 6 formed on the inner peripheral surface of a cylindrical valve housing 1, and a cross-sectional shape along the axis of the valve housing 1 Is a substantially U-shaped sheet piece 8 (18), 9 (19)
Are arranged in a plurality of stages in the radial direction of the valve box and are connected to each other in a folded manner to form the metal sheet 7.
While the base end portion 8a (18a) of the first-stage seat piece 8 (18) is supported by the valve box 1, the last-stage seat piece 9 (19) is supported.
The tip portion 9b (19b) of the above is configured as a contact portion that elastically contacts the valve body side seat surface 5.
Description
【０００１】[0001]
本考案は、メタルシートバタフライ弁のシート構造に関する。 The present invention relates to a seat structure of a metal seat butterfly valve.
【０００２】[0002]
この種のバタフライ弁では、高い弁座シール性が求められる場合、図３に示す ように、弁体１０１を１次もしくは２次偏心弁とし、この弁体１０１の外周面に 形成されたシート表面１０２に対応して円筒形弁箱１０３の内周側に形成した環 状凹所１０４内に、弁箱１０３の軸心方向に沿った断面がＵ字形となるように薄 肉金属板を成形してなるメタルシート１０５を弁座として装着し、このメタルシ ート１０５のわん曲部１０５ａを、薄肉金属板の弾性を利用して、全閉位置の弁 体１０１の上記シート表面１０２に密着状に接触させるようになしている。 In this type of butterfly valve, when high valve seat sealability is required, as shown in FIG. 3, the valve body 101 is a primary or secondary eccentric valve, and the seat surface formed on the outer peripheral surface of this valve body 101 A thin metal plate is formed in an annular recess 104 formed on the inner peripheral side of the cylindrical valve box 103 corresponding to 102 so that the cross section along the axial direction of the valve box 103 is U-shaped. The metal seat 105 made up of the metal sheet 105 is mounted as a valve seat, and the bent portion 105a of the metal sheet 105 is closely attached to the seat surface 102 of the valve body 101 in the fully closed position by utilizing the elasticity of the thin metal plate. The contact is made.
【０００３】 そして、弁体１０１の全閉による流路の遮断時には、弁体１０１が流体圧に押 圧されて軸受隙間分に相当する僅かな距離だけ変位するとともに、下流側へ変形 し、この変位量および変形量に対してメタルシート１０５が弾性変形範囲内で、 同量以上に変形することで、シート表面１０２とメタルシート１０５のわん曲状 接触部１０５ａとの間に良好なシール状態が得られることになる。When the flow path is blocked by the valve body 101 being fully closed, the valve body 101 is pressed by the fluid pressure and displaced by a slight distance corresponding to the bearing clearance, and is deformed to the downstream side. By deforming the metal sheet 105 by the same amount or more within the elastic deformation range with respect to the amount of displacement and the amount of deformation, a good sealing state can be obtained between the sheet surface 102 and the curved contact portion 105a of the metal sheet 105. Will be obtained.
【０００４】[0004]
ところが、上記のように、単にＵ字形のメタルシート１０５を上記凹所１０４ 内に装着したものでは、フランジレスバタフライ弁のように、径方向の外形寸法 が一定に制約されている場合、メタルシート１０５の撓みスパーンＬも制約され て大きくとることができない。したがって、上記弁体１０１が全閉時に変移（矢 印Ｘ）してメタルシート１０５の接触部１０５ａに接触した状態では、大きな応 力が生じ、十分な弾性接触状態が得られない。また、上記応力を小さくするため に、メタルシート１０５の板厚を小さくすると、剛性が低下し、新たな部材で剛 性を高めないと、弁体側シート表面１０２に対する密着力が小さくなるという問 題がある。 However, in the case where the U-shaped metal sheet 105 is simply mounted in the recess 104 as described above, when the outer dimension in the radial direction is constrained to be constant like a flangeless butterfly valve, the metal sheet is The flexible span L of 105 is also restricted and cannot be large. Therefore, when the valve body 101 is displaced (arrow X) when it is fully closed and is in contact with the contact portion 105a of the metal sheet 105, a large reaction force is generated and a sufficient elastic contact state cannot be obtained. Further, if the plate thickness of the metal sheet 105 is reduced in order to reduce the above-mentioned stress, the rigidity is reduced, and unless the rigidity is increased by a new member, the adhesion force to the valve body side seat surface 102 is reduced. There is.
【０００５】 本考案は上記したような従来の課題を解消するためになされたもので、一定の 外形寸法内で、メタルシートの撓み量を大きくとれて、弁体全閉時の密着性の向 上を図ることができるメタルシートバタフライ弁のシート構造を提供することを 目的としている。The present invention has been made in order to solve the above-described conventional problems, and the deflection amount of the metal sheet can be made large within a certain external dimension to improve the adhesiveness when the valve body is fully closed. It is an object of the present invention to provide a seat structure of a metal seat butterfly valve that can improve the above.
【０００６】[0006]
上記目的を達成するために、本考案に係るメタルシートバタフライ弁のシート 構造は、円筒形弁箱の内周面に形成された環状凹所内に、弁体の外周面に形成さ れたシート表面に対して該弁体の全閉位置で弾性的に接触するメタルシートを弁 座として装着したメタルシートバタフライ弁のシート構造において、上記弁箱の 軸心に沿った断面形状が略Ｕ字形のシート片を上記弁箱の径方向で複数段に配設 するとともに、互いに折り返し状に連結して上記メタルシートを構成し、初段の シート片の基端部を上記弁箱に支持させる一方、終段のシート片の先端部を上記 弁体側シート表面に弾性的に接触する接触部としたものである。 In order to achieve the above object, a seat structure of a metal seat butterfly valve according to the present invention is provided with a seat surface formed on an outer peripheral surface of a valve body in an annular recess formed on an inner peripheral surface of a cylindrical valve box. On the other hand, in the seat structure of a metal seat butterfly valve in which a metal seat that elastically contacts at the fully closed position of the valve body is mounted as a valve seat, a seat having a substantially U-shaped cross section along the axial center of the valve box is provided. The pieces are arranged in a plurality of steps in the radial direction of the valve box, and are connected in a folded manner to each other to form the metal sheet, and the base end of the sheet piece of the first step is supported by the valve box while the end step is supported. The tip portion of the seat piece is a contact portion that elastically contacts the valve body side seat surface.
【０００７】[0007]
本考案によれば、断面形状が略Ｕ字形のシート片を径方向で複数段に配設する とともに、折り返し状に連結してメタルシートを構成したので、一定の外形寸法 の制約下でも、メタルシートの大きな撓み量が得られることになる。このため、 全閉時の弁体の変移や変形に対してメタルシートに大きな応力を生じることがな く、したがって、一定の剛性も確保しつつ、弁体のシート面に対する密着力も十 分大きく確保することができる。 According to the present invention, the metal sheet is formed by arranging the sheet pieces having a substantially U-shaped cross section in a plurality of stages in the radial direction and connecting them in a folded shape, so that the metal sheet can be formed even under the constraint of a certain outer dimension. A large amount of bending of the seat can be obtained. For this reason, no large stress is generated in the metal seat due to the displacement or deformation of the valve element when fully closed. Therefore, while maintaining a certain rigidity, the adhesion force of the valve element to the seat surface is also sufficiently large. can do.
【０００８】[0008]
以下、本考案の実施例を図面にもとづいて説明する。 図１は本考案の一実施例によるメタルシートバタフライ弁のシート構造を示す 縦断面図であり、同図において、１は円筒形の弁箱であり、本体２と蓋体３とか らなる。４は上記弁箱１の軸心方向（流れ方向）と直交方向の弁軸（図示せず） に固定されて流路を開閉する弁体であり、一次もしくは二次偏心軸として構成さ れており、その外周面には、軸心方向上流側に向かって漸次径大となるテーパ状 のシート表面５が形成されている。６は上記弁体４の全閉位置に対応して上記弁 箱１の内周面に形成された環状凹所で、メタルシート７が弁座として装着されて いる。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a seat structure of a metal seat butterfly valve according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a cylindrical valve box, which comprises a main body 2 and a lid 3. Reference numeral 4 denotes a valve body which is fixed to a valve shaft (not shown) orthogonal to the axial direction (flow direction) of the valve box 1 to open and close the flow passage, and is configured as a primary or secondary eccentric shaft. On the outer peripheral surface thereof, a tapered seat surface 5 having a diameter gradually increasing toward the upstream side in the axial direction is formed. Reference numeral 6 is an annular recess formed in the inner peripheral surface of the valve box 1 corresponding to the fully closed position of the valve body 4, and a metal seat 7 is mounted as a valve seat.
【０００９】 ８，９はともに薄肉金属板からなり、上記メタルシート７を構成するシート片 であり、両シート片８，９は、弁箱１の軸心方向に沿った縦断面形状が略Ｕ字形 に、具体的には、それぞれしの字形および円弧形に成形されており、これら両シ ート片８，９は径方向で段状に配されるとともに、互いに折り返し状に連結され ている。つまり、初段のシート片８の先端部８ｂに次段（終段）のシート片９の 基端部９ａを溶接などで固定している。そして、上記初段のシート片８の基端部 ８ａを径方向外方へ向けて延出させて弁箱１に支持・固定し、次段のシート片９ の基端部９ｂは全閉位置の弁体４のシート表面５に弾性的に接触する接触部とし て構成されている。Both 8 and 9 are sheet pieces that are made of a thin metal plate and compose the metal sheet 7. Both of the sheet pieces 8 and 9 have a substantially U-shaped longitudinal cross section along the axial direction of the valve box 1. Specifically, the sheet pieces 8 and 9 are formed in a letter shape, specifically, in a letter shape and a circular arc shape, respectively, and these sheet pieces 8 and 9 are arranged in a stepwise manner in the radial direction and are connected to each other in a folded shape. There is. That is, the base end portion 9a of the sheet piece 9 of the next stage (final stage) is fixed to the tip portion 8b of the sheet piece 8 of the first stage by welding or the like. Then, the base end portion 8a of the first-stage seat piece 8 is extended radially outward to be supported and fixed to the valve box 1, and the base end portion 9b of the next-stage seat piece 9 is at the fully closed position. It is configured as a contact portion that elastically contacts the seat surface 5 of the valve body 4.
【００１０】 上記構成のメタルシートバタフライ弁において、弁体４を全閉位置に回動させ ると、該弁体４は流体圧を受けて軸受隙間分だけ下流側（矢印Ｘ方向）へ変移す るとともに、下流側へ僅かに変形しながらメタルシート７、つまりシート片９の 先端部９ｂに接触する。この時、メタルシート７は、互いに折り返し状に連結さ れたシート片８，９で構成されているので、径方向の撓みスパーンがＬ1 ＋Ｌ2 ＋Ｌ3 となり、一定の外形寸法内で大きな撓み量が得ることができる。このため に、弁体４の上記変移に対して十分な弾性変形が生じ、応力が小さく抑えられ、 したがって、弁体側シート表面５に対する密着力も十分に確保させることができ る。In the metal seat butterfly valve having the above structure, when the valve body 4 is rotated to the fully closed position, the valve body 4 receives fluid pressure and shifts to the downstream side (direction of arrow X) by the bearing clearance. At the same time, it contacts the metal sheet 7, that is, the tip portion 9b of the sheet piece 9 while slightly deforming to the downstream side. At this time, since the metal sheet 7 is composed of the sheet pieces 8 and 9 which are connected to each other in a folded manner, the radial deflection span becomes L 1 + L 2 + L 3 , and a large deflection is achieved within a certain outer dimension. The quantity can be obtained. For this reason, sufficient elastic deformation occurs with respect to the above-mentioned displacement of the valve body 4, and the stress is suppressed to a small level. Therefore, sufficient adhesion to the valve body side seat surface 5 can be secured.
【００１１】 また、上記メタルシート７の応力を低くすることができるので、許容応力が低 くなる高温流体用としても使用することが可能となり、適用範囲が広げられる。 図２は本考案の他の実施例を示し、前記断面形状が半円形のシート片１８の先 端部１８ｂと、これに折り返し状に連結されるＣ字形のシート片１９の基端部１ ９ａとを溶接１０で固定してメタルシート７を構成し，上記一方のシート片１８ のわん曲側を径方向外方へ向けて該シート片１８の基端部１８ａを凹所６の側面 に固定したものであり、この場合は、撓みスパーンがＬ1 ＋Ｌ2 ＋Ｌ3 ＋Ｌ4 と なり、バタフライ弁の外形の小寸化に一層対応し易くなる。Further, since the stress of the metal sheet 7 can be lowered, it can be used also for a high temperature fluid having a low allowable stress, and the applicable range is widened. FIG. 2 shows another embodiment of the present invention, in which a front end portion 18b of a sheet piece 18 having a semicircular cross section and a base end portion 19a of a C-shaped sheet piece 19 connected in a folded manner to the front end portion 18b. Are fixed by welding 10 to form the metal sheet 7, and the base end 18a of the sheet piece 18 is fixed to the side surface of the recess 6 with the curved side of the one sheet piece 18 facing outward in the radial direction. In this case, the flexible span becomes L 1 + L 2 + L 3 + L 4 , which makes it easier to respond to the miniaturization of the outer shape of the butterfly valve.
【００１２】 なお、上記メタルシート７は、上記シート片８（１８），９（１９）を二段に 折り返し状に連結したものに限らず、さらに多段の構成も可能であり、また、シ ート片形状や支持位置なども任意に変更可能である。The metal sheet 7 is not limited to one in which the sheet pieces 8 (18) and 9 (19) are connected in a folded manner in two stages, and a further multi-stage configuration is also possible. The shape of the tongue and the support position can be changed arbitrarily.
【００１３】[0013]
以上のように、この考案によれば、弁箱の軸心に沿った断面形状が略Ｕ字形に 成形されたメタルシート片を径方向で複数段に折り返し状に連結してメタルシー トを構成したことにより、弁体のシート表面に接触する部分の撓み量を大きくと ることができ、弁体の全閉時の変移量や変形量に対して高応力を生じさせること なく、上記シート表面との間の密着力を高めることができ、また、許容応力の低 い使用態様に対応でき、汎用性の向上を図ることができる。 As described above, according to the present invention, the metal sheet is formed by connecting the metal sheet pieces, each of which has a substantially U-shaped cross section along the axial center of the valve box, in a folded manner in a plurality of steps in the radial direction. This makes it possible to increase the amount of bending of the portion of the valve body that contacts the seat surface, and without causing high stress to the displacement amount and deformation amount of the valve body when fully closed, It is possible to increase the adhesive force between the two, and it is possible to cope with a usage mode in which the allowable stress is low, and it is possible to improve versatility.
【図１】本考案の一実施例によるメタルシートバタフラ
イ弁のシート構造を示す縦断面図である。FIG. 1 is a vertical sectional view showing a seat structure of a metal seat butterfly valve according to an embodiment of the present invention.
【図２】本考案の他の実施例を示すメタルシートバタフ
ライ弁のシート構造を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a seat structure of a metal seat butterfly valve according to another embodiment of the present invention.
【図３】従来のメタルシートバタフライ弁のシート構造
を示す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a seat structure of a conventional metal seat butterfly valve.
１ 弁箱 ４ 弁体 ５ 弁体のシート表面 ６ 環状凹所 ７ メタルシート ８，９，１８，１９ シート片 ８ａ，９ａ シート片の基端部 ８ｂ，９ｂ シート片の先端部 1 valve box 4 valve body 5 seat surface of valve body 6 annular recess 7 metal seat 8, 9, 18, 19 seat piece 8a, 9a base end portion of seat piece 8b, 9b tip portion of seat piece
Claims (1)
所内に、弁体の外周面に形成されたシート表面に対して
該弁体の全閉位置で弾性的に接触するメタルシートを弁
座として装着したメタルシートバタフライ弁のシート構
造において、上記弁箱の軸心に沿った断面形状が略Ｕ字
形のシート片を上記弁箱の径方向で複数段に配設すると
ともに、互いに折り返し状に連結して上記メタルシート
を構成し、初段のシート片の基端部を上記弁箱に支持さ
せる一方、終段のシート片の先端部を上記弁体側シート
表面に弾性的に接触する接触部としたことを特徴とする
メタルシートバタフライ弁のシート構造。1. A metal elastically contacting a seat surface formed on an outer peripheral surface of a valve body at a fully closed position of the valve body, in an annular recess formed on an inner peripheral surface of a cylindrical valve box. In a seat structure of a metal seat butterfly valve in which a seat is mounted as a valve seat, seat pieces having a substantially U-shaped cross section along the axial center of the valve box are arranged in a plurality of stages in the radial direction of the valve box, The metal sheet is formed by connecting them in a folded manner, and the base end of the first-stage seat piece is supported by the valve box while the tip end of the last-stage seat piece elastically contacts the valve-side seat surface. The seat structure of the metal seat butterfly valve, which is characterized in that it is a contacting part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993062923U JP2589807Y2 (en) | 1993-11-25 | 1993-11-25 | Metal seat butterfly valve seat structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993062923U JP2589807Y2 (en) | 1993-11-25 | 1993-11-25 | Metal seat butterfly valve seat structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0732263U true JPH0732263U (en) | 1995-06-16 |
| JP2589807Y2 JP2589807Y2 (en) | 1999-02-03 |
Family
ID=13214282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993062923U Expired - Fee Related JP2589807Y2 (en) | 1993-11-25 | 1993-11-25 | Metal seat butterfly valve seat structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2589807Y2 (en) |
-
1993
- 1993-11-25 JP JP1993062923U patent/JP2589807Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2589807Y2 (en) | 1999-02-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |