JP2000230645A - Seat structure of butterfly valve - Google Patents
Seat structure of butterfly valveInfo
- Publication number
- JP2000230645A JP2000230645A JP11035103A JP3510399A JP2000230645A JP 2000230645 A JP2000230645 A JP 2000230645A JP 11035103 A JP11035103 A JP 11035103A JP 3510399 A JP3510399 A JP 3510399A JP 2000230645 A JP2000230645 A JP 2000230645A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- seat
- sheet
- butterfly valve
- damage
- 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.)
- Withdrawn
Links
Landscapes
- Lift Valve (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、バタフライ弁のシ
ート構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve seat structure.
【０００２】[0002]
【従来の技術】バタフライ弁においては、弁箱の内部
に、弁棒の軸心廻りに回転して弁箱内流路を開閉する弁
体を設け、流路の開閉動作に伴って圧接離間する弁体の
周縁部と弁箱内周面とにシール性を確保するためのシー
ト部を設けており、通常は、一方のシート部に金属・硬
質ゴムなどの硬質材シート（あるいはライニング、以下
シートという）を配し、他方のシート部に軟質ゴムなど
の弾性材シートを配して、流路全閉時に硬質材で弾性材
を圧縮することにより流体漏れを防止するようにしてい
る。2. Description of the Related Art In a butterfly valve, a valve element which rotates about the axis of a valve rod and opens and closes a flow passage in a valve housing is provided inside a valve housing, and presses and separates with the opening and closing operation of the flow passage. A seat portion is provided between the peripheral portion of the valve body and the inner peripheral surface of the valve box to ensure a sealing property. Usually, a hard material sheet (or lining; ), And an elastic sheet such as soft rubber is arranged on the other sheet portion, and when the flow path is completely closed, the elastic material is compressed with a hard material to prevent fluid leakage.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、バタフ
ライ弁の運転を続ける間にシートが部分的に摩耗するこ
とがあり、またたとえば発電所用海水系統大型バタフラ
イ弁では貝ガラ等の噛みこみによってシートが損傷する
ことがある。このため適宜に弁箱の内側から損傷や摩耗
を点検するようにしているが、損傷や摩耗の概略の深さ
を測定しているのが現状であり、弁のシール性にどの程
度影響するかを判断するのが困難である。大口径の弁ほ
ど（たとえばφ２０００以上）点検が難しく、配管内部
が暗いこともあって、架台等を設置して数人の作業者で
点検する必要がある。However, the seat may be partially worn during the operation of the butterfly valve, and the seat may be damaged due to bite of shells or the like in a large butterfly valve in a seawater system for a power plant. May be. For this reason, damage and wear are checked from the inside of the valve box as appropriate.However, at present, the approximate depth of damage and wear is measured, and how much influence is exerted on the valve sealability. Is difficult to determine. Larger-diameter valves (e.g., φ2000 or more) are more difficult to inspect, and the inside of the pipe may be dark. Therefore, it is necessary to install a gantry or the like and perform inspections by several operators.
【０００４】本発明は上記問題を解決するもので、損傷
や摩耗を容易に確認できるバタフライ弁のシート構造を
提供することを目的とするものである。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a butterfly valve seat structure in which damage or wear can be easily confirmed.
【０００５】[0005]
【課題を解決するための手段】上記問題を解決するため
に、本発明のバタフライ弁のシート構造は、流路開閉動
作に伴って圧接離間する弁体の周縁部と弁箱内周面とに
シール性を確保するシート部を設けたバタフライ弁にお
いて、少なくとも一方のシート部を多層構造に形成し、
各層の表面に層ごとに異なる標識を設けたものである。In order to solve the above-mentioned problems, a seat structure of a butterfly valve according to the present invention has a structure in which a peripheral portion of a valve body which is pressed and separated in accordance with a flow path opening / closing operation and an inner peripheral surface of a valve box. In a butterfly valve provided with a seat portion for ensuring sealing properties, at least one seat portion is formed in a multilayer structure,
Different labels are provided on the surface of each layer.
【０００６】上記した構成によれば、標識として色や図
案などを用いることにより、標識によって露出層を判別
することができ、損傷や摩耗の深さを検知できる。した
がって、弁のシール性への影響を容易に判断可能であ
る。[0006] According to the above-described configuration, by using a color, a design, or the like as a sign, the exposed layer can be determined by the sign, and the depth of damage or wear can be detected. Therefore, the influence on the sealing property of the valve can be easily determined.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施形態を図面を
参照しながら説明する。図１〜図３に示したバタフライ
弁において、弁箱１の内部に、弁棒２の軸心廻りに回転
して弁箱内流路３を開閉する弁体４が設けられており、
流路開閉動作に伴って圧接離間する弁体４に弁体シート
５が設けられ、弁箱１の内周面に弁箱シート６が設けら
れている。Embodiments of the present invention will be described below with reference to the drawings. In the butterfly valve shown in FIGS. 1 to 3, a valve element 4 that rotates around the axis of a valve rod 2 and opens and closes a flow path 3 in the valve box is provided inside the valve box 1.
A valve body sheet 5 is provided on the valve body 4 which is pressed and separated with the passage opening and closing operation, and a valve box sheet 6 is provided on the inner peripheral surface of the valve box 1.
【０００８】弁体シート５は硬質材（たとえば硬質ゴム
または鋳鉄製でクロムメッキ施工したもの）からなり、
弁体４の表面又は周縁部分を覆っている。弁箱シート６
は軟質ゴムからなり、流路全時位置の弁体４の周縁部に
対向する凸状のシート部７を有している。シート部７の
背面側は図示したように弁箱１に嵌入させてもよいし嵌
入させなくてもよい。この環状のシート部７は周方向に
沿う薄層（たとえば０．５〜１ｍｍ厚さ）を内周側に配
した多層構造に形成されており、各層の表面に層ごとに
異なる標識が設けられている。シート部７は、決められ
た圧力に対して漏れが発生しないように弁体４の外径よ
り僅かに小さく製作されている。この（弁体外径寸法−
弁箱シート内径寸法）／２を食い込み代というが、ここ
では、シート部７は初期食い込み代を約３ｍｍとして製
作されており、漏れが発生する限度である限界食い込み
代は実験的に１ｍｍと求められている。そして、厚さ１
ｍｍの第１層８，第２層９，第３層１０を基層１１の内
周側に配するとともに、層間接着剤に着色剤を配合する
ことによって、第２層９，第３層１０，基層１１の表面
に標識としての図３に模式的に示したような緑色面９
ａ、赤色面１０ａ、茶色面１１ａが形成されている。The valve body sheet 5 is made of a hard material (for example, hard rubber or cast iron made of chrome plating).
It covers the surface or peripheral portion of the valve body 4. Valve box seat 6
Is made of soft rubber, and has a convex seat portion 7 facing the peripheral portion of the valve element 4 at the full flow path position. The rear side of the seat 7 may or may not be fitted into the valve box 1 as shown. The annular sheet portion 7 is formed in a multilayer structure in which thin layers (for example, 0.5 to 1 mm thick) are arranged on the inner peripheral side along the circumferential direction, and different signs are provided on the surface of each layer. ing. The seat portion 7 is manufactured to be slightly smaller than the outer diameter of the valve body 4 so that leakage does not occur at a predetermined pressure. This (the outer diameter of the valve-
The inner diameter of the valve box) / 2 is referred to as a bite allowance. Here, the seat portion 7 is manufactured with an initial bite allowance of about 3 mm, and the limit bite allowance, which is a limit at which leakage occurs, is experimentally determined to be 1 mm. Have been. And the thickness 1
mm, the first layer 8, the second layer 9, and the third layer 10 are arranged on the inner peripheral side of the base layer 11, and a coloring agent is blended into the interlayer adhesive to form the second layer 9, the third layer 10, A green surface 9 as a marker, as schematically shown in FIG.
a, a red surface 10a, and a brown surface 11a.
【０００９】上記したようなバタフライ弁では、弁箱内
流路３の開閉動作時には、弁体４が弁棒２の軸心廻りに
回転し、弁体シート５が弁箱シート６のシート部７に摺
接する。弁箱内流路３の全閉時には、弁体シート５がシ
ート部７に約３ｍｍ（弁の運転開始当初）食い込んだ状
態となり、確実にシールされる。In the butterfly valve described above, the valve body 4 rotates about the axis of the valve rod 2 when the flow path 3 in the valve box is opened and closed, and the valve body sheet 5 is seated on the seat portion 7 of the valve box sheet 6. In sliding contact with When the flow path 3 in the valve box is fully closed, the valve body sheet 5 bites into the seat part 7 by about 3 mm (at the beginning of the operation of the valve), so that the seal is securely sealed.
【００１０】運転を続ける間にシート部７に損傷あるい
は摩耗が生じた恐れがある時は、弁箱１の内側から点検
を行う。その際には、緑色面９ａが見えれば、損傷ある
いは摩耗の深さが１ｍｍ程度であり食い込み代が２ｍｍ
程度であるため、シール性に影響ないと判断することが
でき、赤色面１０ａが見える箇所があれば、損傷あるい
は摩耗の深さが２ｍｍ程度であり食い込み代が１ｍｍ程
度であるため、漏れが発生する恐れがあると判断するこ
とができ、茶色面１１ａが見える箇所があれば、損傷あ
るいは摩耗の深さが３ｍｍ程度であって食い込み代がな
いので、その箇所から漏れが発生していると判断でき
る。いずれの場合も、損傷あるいは摩耗の箇所を特定で
きるので、弁箱シート６の補修またはバルブ交換等の対
処を迅速にとることができる。When there is a possibility that the seat portion 7 may be damaged or worn while the operation is continued, an inspection is performed from the inside of the valve box 1. At this time, if the green surface 9a can be seen, the depth of the damage or abrasion is about 1 mm and the cut-in allowance is 2 mm.
It can be determined that there is no effect on the sealability. If there is a portion where the red surface 10a can be seen, the depth of the damage or abrasion is about 2 mm, and the bite allowance is about 1 mm, so leakage occurs. If there is a portion where the brown surface 11a can be seen, the depth of the damage or abrasion is about 3 mm and there is no bite allowance, so it is determined that a leak has occurred from that portion. it can. In any case, the location of the damage or wear can be specified, so that it is possible to quickly take measures such as repairing the valve box sheet 6 or replacing the valve.
【００１１】なお、上記においては標識として表面を一
様に着色するようにしたが、線やドットからなる、層ご
とに異なる図案を付すようにしてもよく、蛍光着色剤を
用いれば暗所でも判別容易である。各層の厚さや標識を
設ける層数は、弁の種類ごとに異なる初期食い込み代や
限界食い込み代、シートの強度などに応じて適宜に決め
ればよい。In the above description, the surface is uniformly colored as a marker. However, a different pattern consisting of lines and dots may be applied to each layer. It is easy to determine. The thickness of each layer and the number of layers provided with the markers may be determined as appropriate according to the initial bite margin, the marginal bite margin, the strength of the sheet, etc., which differ for each type of valve.
【００１２】また、弁体シートと弁箱シートのいずれに
硬質ゴムなどの硬質材シートを用い、いずれに軟質ゴム
などの弾性材シートを用いるかは、弁の種類によって異
なっているので、上記したシート構造をいずれの側の弾
性材シートに適用してもよい。このシート構造を硬質材
シートに適用することも可能である。[0012] Further, which of the valve body sheet and the valve box sheet uses a hard material sheet such as hard rubber and which uses an elastic material sheet such as soft rubber differs depending on the type of valve. The sheet structure may be applied to the elastic sheet on either side. This sheet structure can be applied to a hard material sheet.
【００１３】[0013]
【発明の効果】以上のように、本発明によれば、弁体の
周縁部や弁箱内周面に配するシート部を多層構造に形成
し、各層の表面に層ごとに異なる標識を設けるようにし
たので、損傷や摩耗の有無を外観から容易に確認するこ
とができ、また確認された標識によって弁のシール性へ
の影響を即座に判断できる。As described above, according to the present invention, the sheet portion disposed on the peripheral portion of the valve body and the inner peripheral surface of the valve box is formed in a multilayer structure, and different signs are provided on the surface of each layer. As a result, the presence or absence of damage or wear can be easily confirmed from the appearance, and the effect on the sealing performance of the valve can be immediately determined by the confirmed sign.
【図１】本発明の一実施形態におけるシート構造を備え
たバタフライ弁の概略全体構成を示した断面図である。FIG. 1 is a cross-sectional view illustrating a schematic overall configuration of a butterfly valve having a seat structure according to an embodiment of the present invention.
【図２】同シート構造を示した要部断面図である。FIG. 2 is a sectional view of a main part showing the seat structure.
【図３】同シート構造を説明する模式図である。FIG. 3 is a schematic diagram illustrating the sheet structure.
１ 弁箱 ３ 弁箱内流路 ４ 弁体 ６ 弁箱シート ７ シート部 ９a 緑色面 10a 赤色面 11a 茶色面 DESCRIPTION OF SYMBOLS 1 Valve box 3 Flow path in valve box 4 Valve body 6 Valve box sheet 7 Seat 9a Green surface 10a Red surface 11a Brown surface
Claims (1)
の周縁部と弁箱内周面とにシール性を確保するシート部
を設けたバタフライ弁において、少なくとも一方のシー
ト部を多層構造に形成し、各層の表面に層ごとに異なる
標識を設けたことを特徴とするバタフライ弁のシート構
造。1. A butterfly valve having at least one seat portion having a multi-layered structure provided with a seat portion at a peripheral portion of a valve body which is pressed and separated in accordance with a flow passage opening / closing operation and an inner peripheral surface of a valve box. The butterfly valve seat structure is characterized in that a different mark is provided for each layer on the surface of each layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11035103A JP2000230645A (en) | 1999-02-15 | 1999-02-15 | Seat structure of butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11035103A JP2000230645A (en) | 1999-02-15 | 1999-02-15 | Seat structure of butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000230645A true JP2000230645A (en) | 2000-08-22 |
Family
ID=12432611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11035103A Withdrawn JP2000230645A (en) | 1999-02-15 | 1999-02-15 | Seat structure of butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000230645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004248860A (en) * | 2003-02-20 | 2004-09-09 | Shimadzu Corp | Ultrasonic probe |
| JP2021152289A (en) * | 2020-03-24 | 2021-09-30 | 株式会社ファンクリエイト | Road surface covering sheet and road surface covering sheet inspection method |
-
1999
- 1999-02-15 JP JP11035103A patent/JP2000230645A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004248860A (en) * | 2003-02-20 | 2004-09-09 | Shimadzu Corp | Ultrasonic probe |
| JP2021152289A (en) * | 2020-03-24 | 2021-09-30 | 株式会社ファンクリエイト | Road surface covering sheet and road surface covering sheet inspection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20040917 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20040917 |