JPH03149471A - Check valve - Google Patents
Check valveInfo
- Publication number
- JPH03149471A JPH03149471A JP1287985A JP28798589A JPH03149471A JP H03149471 A JPH03149471 A JP H03149471A JP 1287985 A JP1287985 A JP 1287985A JP 28798589 A JP28798589 A JP 28798589A JP H03149471 A JPH03149471 A JP H03149471A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- valve
- arm
- contact
- check 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
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 abstract description 5
- 238000003466 welding Methods 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Check Valves (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明はたとえば原子力発電所などの配管系に使用され
る逆止弁に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a check valve used in piping systems such as nuclear power plants.
（従来の技術）
原子力発電所内の各系統に使用されている逆止弁は配管
内の流体の逆流を防止する目的で設置され、内部流体の
圧力変動等によって逆流が生じた場合には速やかにかつ
確実に弁閉鎖動作をしなければならない。(Prior technology) Check valves used in each system within a nuclear power plant are installed to prevent backflow of fluid in piping, and if backflow occurs due to pressure fluctuations in the internal fluid, etc., the check valves are The valve must also close reliably.
この種、従来の逆止弁は第５図に示したように弁箱１内
の弁座２に弁体３が流体の逆流が生じた重着座するよう
に回転自在のアーム４に取着されたものからなっている
。な右、図中符号５は流体の流入口、６は流出口、７は
弁ふた、８は回転支持ビン、９はストッパである。弁体
３はアーム４に嵌合され、ワッシャ１０が介在されナツ
ト１１で締め付けられ固定されている。As shown in FIG. 5, this type of conventional check valve has a valve body 3 attached to a rotatable arm 4 such that it is seated on a valve seat 2 in a valve box 1 so that backflow of fluid occurs. It consists of things. On the right, numeral 5 is a fluid inlet, 6 is an outlet, 7 is a valve lid, 8 is a rotation support bottle, and 9 is a stopper. The valve body 3 is fitted into the arm 4, and is fixed by being tightened with a nut 11 with a washer 10 interposed therebetween.
このような従来の逆止弁は内部流体の圧力および弁体３
の自重によって閉動作するが、弁体３を弁座２に確実に
着座させ、逆圧に対する弁座２の漏洩を防止するために
第６図に示したように弁体３とアーム４との嵌合部１２
には若干の隙間ａが設けられ、かつアーム４側の嵌合部
１２に傾斜面を形成することによって弁体３が弁座２に
密着するための首振り運動を可能にしている。Such conventional check valves have internal fluid pressure and valve body 3.
The valve body 3 closes due to its own weight, but in order to ensure that the valve body 3 is seated on the valve seat 2 and to prevent the valve seat 2 from leaking due to back pressure, the valve body 3 and the arm 4 are connected as shown in FIG. Fitting part 12
A slight gap a is provided in the valve body 3, and an inclined surface is formed on the fitting portion 12 on the arm 4 side, thereby making it possible to swing the valve body 3 into close contact with the valve seat 2.
この傾斜面１３の傾斜角ｄは最大振れ角度すの２倍を有
している。The inclination angle d of this inclined surface 13 has twice the maximum deflection angle s.
（発明が解決しようとする課題）
しかしな、がら、このような従来の逆止弁は内部流体の
流速または流れの状態によっては弁体３の首振り運動ま
たは回転運動が運転中に常時発生し、嵌合部が摩耗する
ことによって逆止弁の機能および健全性に悪影響を及ぼ
し、原子力発電所の定常運転を阻害しかねない要因があ
る。すなわち、第６図に示したようにアーム４の嵌合部
１２には一端から他端に沿って傾斜角ｄが形成されいて
るためアーム４詔よび弁体３は線接触となり、内部流体
の変動に対して不安定な状態になり、健全性が損なわれ
る課題がある。(Problem to be Solved by the Invention) However, in such a conventional check valve, the swinging motion or rotational motion of the valve body 3 constantly occurs during operation depending on the flow velocity or flow condition of the internal fluid. There are factors that can adversely affect the function and integrity of the check valve due to wear of the fitting part, and may impede the steady operation of the nuclear power plant. That is, as shown in FIG. 6, since the fitting portion 12 of the arm 4 is formed with an inclination angle d from one end to the other, the arm 4 and the valve body 3 are in line contact, which prevents fluctuations in the internal fluid. There is a problem that the system becomes unstable and its soundness is impaired.
本発明は上記課題を解決するためになされたもので、弁
体の首振り運動または回転運動による弁体とアームとの
嵌合部の摩耗の発生を防止して弁体の動作を確実にする
ことによって逆止弁の健全性を確保し原子力発電所の各
系統配管の機能を十分に果すことができる逆止弁を提供
することにある。The present invention has been made to solve the above problems, and ensures the operation of the valve body by preventing the occurrence of wear on the fitting portion between the valve body and the arm due to the oscillation or rotational movement of the valve body. The object of the present invention is to provide a check valve that can ensure the integrity of the check valve and sufficiently fulfill the functions of each system piping of a nuclear power plant.
［発明の構成］
（課題を解決するための手段）
本発明は流体の流入口から流出口へ通じる流路中に弁座
が設けられた弁箱と、この弁箱内に一端部が回転自在に
支持されたアームと、このアームの他端部に嵌合されて
ナツト締めで固定されかつるように前記弁体が前記アー
ムに対して首振り運動が可能に形成される逆止弁におい
て、前記アームと弁体との嵌合接触部には耐摩耗性硬質
材料が溶着され、かつ曲率面または傾斜面が形成されて
前記弁体が前記アームに対する首振り運動の最大振れ角
で前記弁体が前記アームに面接触することを特徴とする
特
＊作 用）
流体が流入口から流路を通って流出口へ流れ、また逆流
を生じて内部流体の流速流れの状態によって弁体に首振
り運動や回転運動が発生した場合、その大きさは微小か
つ穏やかなものとなる。また、嵌合部径の増大による接
触面圧の低減、硬質材料の溶着などによる接触面の硬度
の増加により、嵌合部分での摩耗の発生が防止される。[Structure of the Invention] (Means for Solving the Problems) The present invention provides a valve box in which a valve seat is provided in a flow path leading from a fluid inlet to an outlet, and one end of which is rotatable within the valve box. In the check valve, the valve body is formed to be able to swing relative to the arm so as to be fitted to the other end of the arm and fixed by tightening a nut, A wear-resistant hard material is welded to the fitting contact portion between the arm and the valve body, and a curved surface or an inclined surface is formed so that the valve body can move at the maximum swing angle of the swing motion with respect to the arm. A special feature characterized in that the valve is in surface contact with the arm) The fluid flows from the inlet to the outlet through the flow path, and a reverse flow occurs, causing the valve body to oscillate depending on the flow rate and flow condition of the internal fluid. When motion or rotational motion occurs, its magnitude is minute and gentle. In addition, the occurrence of wear at the fitting portion is prevented by reducing the contact surface pressure due to an increase in the diameter of the fitting portion and by increasing the hardness of the contact surface due to welding of hard materials.
（実施例）
第１図および第２図を参照しながら本発明の係る逆止弁
の一実施例を説明する。(Example) An example of a check valve according to the present invention will be described with reference to FIGS. 1 and 2.
第１図中第５図と同一部分には同一符号で示し、重複す
る部分の説明は省略する。なお、第１図においては本発
明の要部のみ示している。Components in FIG. 1 that are the same as those in FIG. 5 are designated by the same reference numerals, and explanations of overlapping portions will be omitted. In addition, in FIG. 1, only essential parts of the present invention are shown.
第１図において、アーム４には弁体３が嵌め合いで組合
わされ、ワッシャ１０およびナツト１１を用いて弁体３
はアーム４に支持されいてる。アーム４と弁体３との間
には第２図に示したように隙間ａを有しており、弁体３
が弁座２に着座した際、弁座２面と弁体３面との角度の
ずれを吸収して密着するような構造となっている。In FIG. 1, the arm 4 is fitted with the valve body 3, and the washer 10 and nut 11 are used to tighten the valve body 3.
is supported by arm 4. As shown in FIG. 2, there is a gap a between the arm 4 and the valve body 3.
When seated on the valve seat 2, the structure is such that the angular deviation between the valve seat 2 surface and the valve body 3 surface is absorbed and they come into close contact.
しかして、上記実施例における逆止弁が第１図に示すよ
うな開状態にあるとき、弁体３はその自重および隙間ａ
のために、アーム４の嵌合孔１５の中心線に対−して傾
きｂを生ずる。すなわち、第２図中点線Ａと点線Ｂで区
切られた接触部１６の傾斜面１６ａは第２図の断面状態
で直線を形成し、この傾斜面１６ａの中心線に対する傾
きはｂに形成されている。。これにより、アーム４およ
び弁体３は面接触を成す構造となっている。Therefore, when the check valve in the above embodiment is in the open state as shown in FIG.
Therefore, an inclination b is generated with respect to the center line of the fitting hole 15 of the arm 4. That is, the inclined surface 16a of the contact portion 16 separated by the dotted line A and the dotted line B in FIG. 2 forms a straight line in the cross-sectional state of FIG. There is. . Thereby, the arm 4 and the valve body 3 have a structure in which they are in surface contact.
また、点線Ｂと点線Ｃで区切られた接触部１６の傾斜面
１６ｂは曲面に形成されている。さらに、その接触面に
耐摩性硬質材料１４を密着させることにより、その表面
硬度を上昇させるとともに、弁体３の嵌合部１２の径を
増大し、接触面圧の低下を図っている。Further, the inclined surface 16b of the contact portion 16 separated by the dotted line B and the dotted line C is formed into a curved surface. Further, by bringing the wear-resistant hard material 14 into close contact with the contact surface, the surface hardness is increased, and the diameter of the fitting portion 12 of the valve body 3 is increased to reduce the contact surface pressure.
なお、耐摩耗性硬質材料１４はたとえばステライトなど
を溶着するか耐摩耗性金属またはセラミックス材料など
を溶射するともできる。The wear-resistant hard material 14 may be formed by welding stellite or the like, or by thermally spraying a wear-resistant metal or ceramic material.
しかして、本実施例によれば、弁体３の首振りおよび回
転現象が大幅に低減され、さらに接触面の面圧低下およ
び硬度の上昇によって接触面での摩耗の発生が防止され
、逆止面の健全性が確保できる。Therefore, according to this embodiment, the oscillation and rotation phenomena of the valve body 3 are significantly reduced, and furthermore, the occurrence of wear on the contact surface is prevented due to the reduction in surface pressure and increase in hardness of the contact surface, and the occurrence of wear on the contact surface is prevented. The soundness of the surface can be ensured.
第３＠および第４図はそれぞれ本発明の他の実施例の要
部のみを示すものである。第３図は、アーム４の嵌合孔
１５の部分の接触部１７を曲面１７ａに形成したもので
あり、アーム４と弁体３の接触線が首振り運動時に変化
するように形成されている。第４図はアーム４と弁体３
との隙間ａ側の接触面においてアーム４を曲面 １７と
したものである。また、アーム４の嵌合孔１５は弁封３
の傾きに合わせた傾斜面１６を有している。Figures 3 and 4 respectively show only the main parts of other embodiments of the present invention. In FIG. 3, the contact portion 17 of the arm 4 at the fitting hole 15 is formed into a curved surface 17a, and is formed so that the contact line between the arm 4 and the valve body 3 changes during swinging motion. . Figure 4 shows arm 4 and valve body 3.
The arm 4 has a curved surface 17 at its contact surface on the side of the gap a. Further, the fitting hole 15 of the arm 4 is connected to the valve seal 3.
It has an inclined surface 16 that matches the inclination of.
なお、その他の構造は第１図に示した実施例と同様であ
る。すなわち、上記各実施例における逆止弁は、流入口
５から流出口６へ通ずる流路中に弁座２を有する弁箱１
と、前記弁座２に接して流体の逆流を阻止し、流出口５
側から流体圧が作用すると弁座２から離れる方向へ開動
作して流体を流通させ、アーム４との嵌め合い接触部に
硬質材料１４を溶着させている弁体３と、前記弁体３を
回転支持し、前記弁体３との嵌合部１２の接触面に硬質
材料 １４を溶着し、その嵌合部１２の接触面が前記弁
座２と弁体３との接触を確実にするために、曲面１７ま
たは傾斜面１６を有するアームを具備したことを特徴と
する。これによって従来の逆止弁において不具合の要因
と考えられているアーム４と弁体３との接触面での摩耗
の発生が防止され、その健全性の確保、さらには原子力
発電所の各系統配管の信頼性の向上が可能となる優れた
効果を奏する。Note that the other structure is the same as that of the embodiment shown in FIG. That is, the check valve in each of the above embodiments includes a valve box 1 having a valve seat 2 in a flow path leading from an inlet 5 to an outlet 6.
The outflow port 5 contacts the valve seat 2 to prevent backflow of fluid.
When fluid pressure is applied from the side, the valve element 3 opens in the direction away from the valve seat 2 to allow fluid to flow, and the valve body 3 has a hard material 14 welded to the fitting contact portion with the arm 4. A hard material 14 is rotatably supported and welded to the contact surface of the fitting portion 12 with the valve body 3, so that the contact surface of the fitting portion 12 ensures contact between the valve seat 2 and the valve body 3. The present invention is characterized in that it includes an arm having a curved surface 17 or an inclined surface 16. This prevents wear on the contact surface between the arm 4 and the valve body 3, which is thought to be a cause of malfunctions in conventional check valves, and ensures its integrity. This has an excellent effect of improving reliability.
［発明の効果］
本発明によれば弁体の首振りおよび回転現象が大幅に低
減され、また接触面の面圧低下および硬度の上昇によっ
て接触面での摩耗の発生が防止され、よって健全性ガ（
確保された逆止弁を提供することができる。[Effects of the Invention] According to the present invention, the swinging and rotation phenomena of the valve body are significantly reduced, and the occurrence of wear on the contact surface is prevented by reducing the contact pressure and increasing the hardness of the contact surface, thus improving the integrity of the valve body. Moth (
A secured check valve can be provided.
第１図は本発明に係る逆止弁の一実施例の要部を示す部
分断面図、第２図は第１図のアームと弁体との関係を説
明するための模式図、第３図および第４図は本発明の他
の実施例の要部のみを一部断面でそれぞれ示す側面図、
第５図は従来の逆止弁を一部側面で示す縦断面図、第６
図は第５図におけるアームと弁体との関係を説明するた
めの模式図である。
１−−一弁箱 ２・・・弁座
３・・・弁体 ４・・・アーム ５−・・流
入口 ６・・・流出口ア・・・ふた ８
・・・支持ビン９・・・ストッパ ■・・・ワッシ
ャ１１・・・ナツト １２・・・嵌合部ｌト・・
傾斜面 １ト・硬質材料ｌト・・嵌合孔
ｌＧ、１７・・・接触部１Ｆ・・曲面
代理人 弁理士 則 近 憲 佑
同 弟子丸 健
苧へ
竹八１６ｂ
第２図
１ ｒゝ１１
第３図
１１１１ＪＩ−
第４図
ａ−Ｘｒ１−４
第６図FIG. 1 is a partial sectional view showing essential parts of an embodiment of the check valve according to the present invention, FIG. 2 is a schematic diagram for explaining the relationship between the arm and the valve body in FIG. 1, and FIG. 3 and FIG. 4 is a side view showing only the main part of another embodiment of the present invention in partial cross section,
Figure 5 is a vertical sectional view partially showing a conventional check valve from the side;
This figure is a schematic diagram for explaining the relationship between the arm and the valve body in FIG. 5. 1-- Valve box 2... Valve seat 3... Valve body 4... Arm 5-... Inlet 6... Outlet a... Lid 8
...Support bottle 9...Stopper ■...Washer 11...Nut 12...Fitting part...
Slanted surface 1, hard material, fitting hole
lG, 17...Contact part 1F...Curved surface agent Patent attorney Nori Chika Ken Yudo Deshimaru Takehachi 16b Fig. 2 1 rゝ11 Fig. 3 1111JI- Fig. 4 a-Xr1-4 No. 6 figure
Claims (1)
れた弁箱と、この弁箱内に一端部が回転自在に支持され
たアームと、このアームの他端部に嵌合されてナット締
めで固定されかつ流体の逆流時に前記弁座に着座して逆
流を防止する弁体とからなる逆止弁において、前記アー
ムと弁体との嵌合接触部には耐摩耗性硬質材料が溶着さ
れ、かつ曲率面または傾斜面が形成されていることを特
徴とする逆止弁。A valve box in which a valve seat is provided in a flow path leading from a fluid inlet to an outflow port, an arm whose one end is rotatably supported within the valve box, and which is fitted into the other end of the arm. A check valve comprising a valve body that is fixed by tightening a nut and seats on the valve seat to prevent backflow when fluid flows backward, and a wear-resistant hard material is used at the fitting contact portion between the arm and the valve body. What is claimed is: 1. A check valve characterized in that a check valve is welded to a curved surface or an inclined surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1287985A JPH03149471A (en) | 1989-11-07 | 1989-11-07 | Check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1287985A JPH03149471A (en) | 1989-11-07 | 1989-11-07 | Check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03149471A true JPH03149471A (en) | 1991-06-26 |
Family
ID=17724303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1287985A Pending JPH03149471A (en) | 1989-11-07 | 1989-11-07 | Check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03149471A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0590062U (en) * | 1992-05-15 | 1993-12-07 | 加藤発条株式会社 | Check valve |
| JP2008064263A (en) * | 2006-09-11 | 2008-03-21 | Chugoku Electric Power Co Inc:The | Check valve and check valve repairing method |
-
1989
- 1989-11-07 JP JP1287985A patent/JPH03149471A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0590062U (en) * | 1992-05-15 | 1993-12-07 | 加藤発条株式会社 | Check valve |
| JP2008064263A (en) * | 2006-09-11 | 2008-03-21 | Chugoku Electric Power Co Inc:The | Check valve and check valve repairing method |
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