JP2003336752A - Valve element for ball valve - Google Patents
Valve element for ball valveInfo
- Publication number
- JP2003336752A JP2003336752A JP2002183625A JP2002183625A JP2003336752A JP 2003336752 A JP2003336752 A JP 2003336752A JP 2002183625 A JP2002183625 A JP 2002183625A JP 2002183625 A JP2002183625 A JP 2002183625A JP 2003336752 A JP2003336752 A JP 2003336752A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve body
- fluororesin
- ball
- seat ring
- 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
- Coating By Spraying Or Casting (AREA)
- Taps Or Cocks (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はメタルタッチ型の
ボール弁に係り、具体的にはシートリングとの摺動性を
改善したボール弁用弁体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal touch type ball valve, and more particularly to a ball valve valve body having improved slidability with a seat ring.
【０００２】[0002]
【従来の技術】ボール弁は、弁体の開弁時に、管路と同
じ断面形状の流路が確保されるため、流れがストレート
で圧力損失が少なく、固形物の管路輸送時にも障害には
ならないなどの利点があり、流体のみならず、粉体等の
固形物の輸送管路にも用いられている。2. Description of the Related Art A ball valve ensures a flow passage having the same cross-sectional shape as the pipe when the valve body is opened, so that the flow is straight and there is little pressure loss, which is an obstacle when transporting solid pipes. It has the advantage that it does not occur, and is used not only for fluids but also for transporting solid materials such as powders.
【０００３】図８（ａ）（ｂ）は、このメタルタッチ型
ボール弁の一例（２方弁）を示したもので、弁箱１の両
端に流体の出入り口となる開口部２、２に通じた弁室３
内にボール形の弁体４が収納され、前記両側の開口部
２、２から弁室３にかけて、シートリング５、５がそれ
ぞれ収納され、このシートリング５、５の内端面が、弁
体４に摺接するようになっている。FIGS. 8 (a) and 8 (b) show an example (two-way valve) of this metal touch type ball valve, which is connected to both ends of a valve box 1 through openings 2 and 2 which serve as fluid inlets and outlets. Valve room 3
A ball-shaped valve body 4 is housed inside, and seat rings 5 and 5 are housed respectively from the openings 2 and 2 on both sides to the valve chamber 3, and the inner end surfaces of these seat rings 5 and 5 are It is designed to slide on.
【０００４】各シートリング５、５は、前記開口部２、
２に螺合した押えリング６により、押圧ばね７を介し
て、ボール状の弁体４に押圧されている。Each of the seat rings 5 and 5 has the opening 2,
It is pressed against the ball-shaped valve element 4 via the pressing spring 7 by the pressing ring 6 screwed onto the valve 2.
【０００５】弁箱１の弁室３の上方の開口部８は、ボン
ネット９により閉塞され、弁体４に一体に設けた弁軸１
０が、水密性を保持して、ボンネット９を貫通して上方
に延び、その先端に、弁体４の操作レバー１１に嵌合す
る角柱部１０ａが設けられている。弁体４の底面中心に
は小軸１２が突設され、弁室３の底面に設けた軸受孔１
３に挿入されている。The opening 8 above the valve chamber 3 of the valve box 1 is closed by a bonnet 9, and the valve shaft 1 provided integrally with the valve body 4 is provided.
No. 0 has watertightness, penetrates the bonnet 9 and extends upward, and a prism portion 10a fitted to the operation lever 11 of the valve body 4 is provided at the tip thereof. A small shaft 12 is provided at the center of the bottom surface of the valve body 4, and a bearing hole 1 provided at the bottom surface of the valve chamber 3 is provided.
It is inserted in 3.
【０００６】前記弁体４には、その両側にシートリング
５、５の内端面５ａの内径に合致する口径の弁孔１４が
設けられている。そして、シートリング５、５の内端面
５ａ、５ａが、この弁孔１４の両端の擦り合わせ部４ａ
に押圧された状態で開弁状態となり、前記操作レバー１
１により、弁軸１０を介して弁体４を９０°回転させ
て、シートリング５、５の各内端面５ａが、弁体４の閉
塞面の擦り合わせ部４ｂに押圧されて閉弁状態となる。The valve body 4 is provided on both sides thereof with a valve hole 14 having a diameter matching the inner diameter of the inner end surface 5a of the seat ring 5,5. Then, the inner end surfaces 5a, 5a of the seat rings 5, 5 are rubbed with the rubbing portions 4a at both ends of the valve hole 14.
The valve is opened when pressed by the operation lever 1
1, the valve body 4 is rotated 90 ° via the valve shaft 10 so that the inner end surfaces 5a of the seat rings 5 and 5 are pressed by the rubbed portion 4b of the closed surface of the valve body 4 to close the valve. Become.
【０００７】前記弁体４およびシートリング５は、耐食
性や耐熱性の面から、いずれもステンレス鋼で形成され
ており、弁体４の開閉に伴って、弁体４とシートリング
５とは摺動するため、ステンレス鋼どうしでは齧りを生
じ、また、粉体輸送時には侵食が生じる。このため、耐
摩耗性、耐食性等の向上を目的として、また、摺動する
互いの部材に硬度差を付けて齧りを防止するために、弁
体４には、硬質クロムメッキまたは自溶性合金の溶射な
どの表面硬化処理が施され、シートリング５の内端面５
ａには、ステライトなどの硬質合金の肉盛による表面硬
化処理が行われていた。The valve body 4 and the seat ring 5 are both made of stainless steel from the viewpoint of corrosion resistance and heat resistance, and the valve body 4 and the seat ring 5 slide along with the opening and closing of the valve body 4. Therefore, the stainless steels are bitten with each other and eroded during the powder transportation. Therefore, in order to improve wear resistance, corrosion resistance, and the like, and in order to prevent sliding due to the difference in hardness between the sliding members, the valve body 4 is made of hard chrome plating or self-fluxing alloy. The inner end surface 5 of the seat ring 5 is subjected to surface hardening treatment such as thermal spraying.
The surface hardening treatment was performed on the surface a by overlaying a hard alloy such as stellite.
【０００８】[0008]
【発明が解決しようとする課題】しかし、弁体４の開閉
に伴い、弁体４とシートリング５の内端面５ａとは摺動
するために、弁体４およびシートリング５に前記の表面
硬化処理を施しても、弁体４の開閉回数（作動回数）が
増加するにつれて、弁体４とシートリング５との摺動性
が低下してきて、弁体４の開閉に要する弁体開閉トルク
が上昇し、弁体４とシートリング５とがともに金属で形
成されたメタルタッチ型のボール弁であるため、局所的
に金属接触を起こして弁体４とシートリング５とがきし
み、弁体４の回転が途中で止まってしまう場合がある。However, as the valve body 4 opens and closes, the valve body 4 and the inner end surface 5a of the seat ring 5 slide, so that the surface hardening of the valve body 4 and the seat ring 5 is performed. Even if the treatment is performed, the slidability between the valve body 4 and the seat ring 5 decreases as the number of times the valve body 4 opens and closes (number of times of operation) increases, and the valve body opening and closing torque required to open and close the valve body 4 increases. Since the valve body 4 and the seat ring 5 ascend to the metal touch type ball valve in which both the valve body 4 and the seat ring 5 are made of metal, the valve body 4 and the seat ring 5 are squeaked locally to cause the valve body 4 and the seat ring 5. May stop rotating halfway.
【０００９】このため、摺動抵抗を低下させるために、
弁体４とシートリング５との摺動面に潤滑油を塗布して
も、管路を流れる流体が、吸湿性や脱脂性の高い流体の
場合、または熱風のように摺動面をドライにさせるよう
な流体である場合には、潤滑効果が消失してしまう。ま
た、油分や不純物の混入が許容されない流体、または粉
体を管路輸送する場合には潤滑油を使用できないため、
上記のような摺動性の低下を改善できないという問題が
あり、ボール弁の寿命の低下を来していた。Therefore, in order to reduce the sliding resistance,
Even if lubricating oil is applied to the sliding surface between the valve body 4 and the seat ring 5, if the fluid flowing through the pipeline is highly hygroscopic or degreasing, or if the sliding surface is dry like hot air. If the fluid is such a fluid, the lubricating effect will disappear. In addition, since lubricating oil cannot be used for pipeline transport of fluids or powders that cannot contain oil or impurities,
There is a problem that the above-mentioned deterioration of slidability cannot be improved, and the life of the ball valve is shortened.
【００１０】そこで、この発明の課題は、弁体とシート
リングとの摺動性を改善し、潤滑剤を付与しなくても、
長期にわたって弁体トルクが安定する、寿命の長いメタ
ルタッチ型のボール弁用の弁体を提供することである。Therefore, an object of the present invention is to improve the slidability between the valve body and the seat ring and to provide a lubricant without applying a lubricant.
A valve element for a metal touch type ball valve having a long valve life, in which the valve element torque is stable over a long period of time.
【００１１】[0011]
【課題を解決するための手段】前記の課題を解決するた
めに、この発明では以下の構成を採用したのである。In order to solve the above problems, the present invention adopts the following configuration.
【００１２】即ち、弁箱内の弁室に収納されるボール形
の弁体であって、該弁体に設けた弁孔が流路の出入り口
に嵌合されたシートリングと合致して開弁状態となり、
その状態から所要角度回転して閉弁状態又は流路切替え
状態となるにボール弁用弁体において、前記弁体の表面
に硬質合金の溶射処理による溶射皮膜を形成し、その溶
射皮膜にフッ素樹脂のコーティング層を形成し、このコ
ーティング層の一部を前記溶射皮膜のポーラス部に浸入
付着せしめた構成としたのである。That is, a ball-shaped valve body housed in a valve chamber in a valve box, the valve hole provided in the valve body is matched with a seat ring fitted to the inlet and outlet of the flow path to open the valve. State,
In the valve body for a ball valve, which is rotated by a required angle from that state to a closed state or a flow path switching state, a spray coating is formed on the surface of the valve body by spraying a hard alloy, and the spray coating is made of a fluororesin. The coating layer is formed, and a part of the coating layer is made to infiltrate and adhere to the porous portion of the thermal spray coating.
【００１３】このように構成すれば、弁体表面に形成さ
れた多孔質の金属溶射皮膜の表層のポーラス部（即ち、
溶射皮膜の表面に存在する多孔質部）の無数の孔内部
に、摩擦係数が小さく、摺動性に優れたフッ素樹脂が浸
入付着してコーティング層が形成されるため、弁体の作
動時に自己潤滑性が発揮される。また、そのコーティン
グ層の一部は金属溶射皮膜のポーラス部に侵入付着して
いるため剥離し難く、長期にわたりコーティング層が維
持される。このため、無潤滑下で作動回数が増加しても
弁体トルクが安定し、長期にわたり組み立て時の初期状
態を維持する。According to this structure, the porous portion of the surface layer of the porous metal sprayed coating formed on the valve body surface (that is,
Fluororesin, which has a small friction coefficient and excellent slidability, infiltrates and adheres inside the myriad of pores (the porous part existing on the surface of the thermal spray coating) to form a coating layer. Lubricity is demonstrated. Moreover, since a part of the coating layer penetrates and adheres to the porous portion of the metal spray coating, it is difficult to peel off and the coating layer is maintained for a long period of time. Therefore, even if the number of operations increases without lubrication, the valve body torque is stable, and the initial state during assembly is maintained for a long period of time.
【００１４】前記ボール形の弁体の表面に溶射される硬
質合金として自溶性合金を用いることが望ましい。ボー
ル形の弁体に溶射する硬質合金として、ニッケル基やコ
バルト基の合金にホウ素や珪素を添加した自溶性合金を
用いると、溶射後の加熱処理により、微細で、高融点の
化合物が均一に分布した組織の、高硬度で耐摩耗性に優
れ、ステンレス鋼などの弁体素地への溶着が良好なもの
となる。その他の硬質合金としてＨＣｒ（硬質クロムメ
ッキ）を用いることができる。It is desirable to use a self-fluxing alloy as the hard alloy sprayed on the surface of the ball-shaped valve body. If a self-fluxing alloy with boron or silicon added to a nickel-based or cobalt-based alloy is used as a hard alloy that is sprayed onto a ball-shaped valve element, a fine, high-melting-point compound is evenly formed by heat treatment after spraying. The distributed structure has high hardness and excellent wear resistance, and is well welded to the valve body such as stainless steel. HCr (hard chrome plating) can be used as another hard alloy.
【００１５】また、シートリングの内端面に設けるステ
ライトなどの肉盛用合金との硬度差も存在するために、
前述の齧りの発生も防止することができる。Further, since there is a hardness difference from the alloy for build-up such as stellite provided on the inner end surface of the seat ring,
It is also possible to prevent the occurrence of the aforementioned bite.
【００１６】なお、前記弁体の表面への溶射処理後に、
その溶射皮膜にブラスト処理を施し、その後フッ素樹脂
のコーティングを行うことが望ましい。After the thermal spraying treatment on the surface of the valve body,
It is desirable that the sprayed coating be blasted and then coated with a fluororesin.
【００１７】このように、溶射皮膜にサンドブラストな
どのブラスト処理を行うと、溶射皮膜表層のポーラス部
の凹凸が増幅されるため、フッ素樹脂が浸入して付着し
やすくなり、また、フッ素樹脂がこの表面の凹凸部にか
み合うように付着するので、コーティング層の密着性が
向上する。As described above, when the thermal spray coating is subjected to blasting such as sandblasting, the unevenness of the porous portion of the surface layer of the thermal spray coating is amplified, so that the fluororesin easily penetrates and adheres. The adhesiveness of the coating layer is improved because it is attached so as to engage with the irregularities on the surface.
【００１８】また、前記シートリングが密着される弁体
の一部に前記フッ素樹脂のコーティング層を剥離し溶射
皮膜が露出した擦り合わせ部を形成し、該擦り合わせ部
において前記溶射皮膜のポーラス部に前記フッ素樹脂の
一部を残存せしめた構成を採用することができる。Further, a rubbed portion where the sprayed coating is exposed by peeling off the coating layer of the fluororesin is formed on a part of the valve body to which the seat ring is adhered, and the porous portion of the sprayed coating is formed at the rubbed portion. It is possible to employ a configuration in which a part of the fluororesin is left.
【００１９】上記の擦り合わせは、弁体とシートリング
との密着性を向上させるために行われるが、その擦り合
わせによってフッ素樹脂のコーティング層が剥離されて
も、フッ素樹脂の一部が溶射皮膜のポーラス部に残存し
ているため、自己潤滑性が発揮される。The above rubbing is performed in order to improve the adhesion between the valve body and the seat ring. Even if the fluororesin coating layer is peeled off by the rubbing, a part of the fluororesin is sprayed. Since it remains in the porous part of, the self-lubricating property is exhibited.
【００２０】また、前記擦り合わせ部以外の部分に形成
された前記フッ素樹脂のコーティング層が、弁体の回転
時に前記シートリングとの摺接部となり、該摺接部がフ
ッ素樹脂の供給源となる構成をとることもできる。この
構成によると、弁体が回転する際に摺接部のフッ素樹脂
が摩耗され、その摩耗粉が摺動面に供給されるため、長
期にわたり良好な自己潤滑性が発揮される。Further, the fluororesin coating layer formed on a portion other than the rubbing portion serves as a sliding contact portion with the seat ring when the valve body rotates, and the sliding contact portion serves as a fluororesin supply source. It is also possible to adopt the configuration. With this configuration, when the valve body rotates, the fluororesin in the sliding contact portion is abraded and the abrasion powder is supplied to the sliding surface, so that good self-lubricating property is exhibited for a long period of time.
【００２１】[0021]
【発明の実施の形態】以下に、この発明の実施形態を添
付の図１から図７に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying FIGS.
【００２２】図１および図２に示すボール形の弁体４お
よびシートリング５は、いずれもステンレス鋼で形成さ
れており、弁体４の表面には、ニッケル基などの自溶性
合金が溶射されて、５００μｍ程度の厚さの溶射皮膜１
５（図２参照）が形成されている。この溶射皮膜１５上
に、３０μｍ程度の４フッ化エチレンなどのフッ素樹脂
のコーティング層１６が形成されている。前記シートリ
ング５の内端面５ａには、厚さ１．５ｍｍ程度のステラ
イトの溶接肉盛層１７が付与されている。The ball-shaped valve element 4 and seat ring 5 shown in FIGS. 1 and 2 are both made of stainless steel, and the surface of the valve element 4 is sprayed with a self-fluxing alloy such as nickel base. And thermal spray coating 1 with a thickness of about 500 μm
5 (see FIG. 2) are formed. A coating layer 16 of fluororesin such as tetrafluoroethylene having a thickness of about 30 μm is formed on the thermal spray coating 15. A weld overlay layer 17 of stellite having a thickness of about 1.5 mm is provided on the inner end surface 5a of the seat ring 5.
【００２３】前記弁体４に設けた弁孔１４の両端の擦り
合わせ部４ａと、シートリング５、５の内端面とが合致
して開弁状態となり、この開弁状態から、操作レバー１
１（図８参照）により弁軸１０を約９０°回転させて、
シートリング５の内端面５ａが弁体４の閉塞面の擦り合
わせ部４ｂに合致すると閉弁状態となる。The rubbing portions 4a at both ends of the valve hole 14 provided in the valve body 4 and the inner end surfaces of the seat rings 5 and 5 are brought into a valve open state. From this valve open state, the operating lever 1 is opened.
1 (see FIG. 8) to rotate the valve shaft 10 about 90 °,
When the inner end surface 5a of the seat ring 5 matches the rubbed portion 4b of the closed surface of the valve body 4, the valve is closed.
【００２４】図３（ａ）から（ｆ）は、前記ボール形の
弁体４に、前記自溶性合金の溶射皮膜１５と、この溶射
皮膜１５上に、前記フッ素樹脂のコーティング層１６を
形成する工程を示したものである。まず、ボール形の弁
体４の素地表面にニッケル基などの自溶性合金がノズル
２１から噴出されて、溶射皮膜１５が成膜され（工程
（ａ））、弁体４の寸法精度を確保するために、まず、
溶射皮膜１５の表面を切削工具２２により球面切削し
（工程（ｂ））、次いで、研削工具２３により、球面研
削を行い（工程（ｃ））、その後に、フッ素樹脂を付着
させやすくするために、砂粒２５を吹付けるサンドブラ
スト処理を行って、溶射皮膜１５の表層のポーラス部の
凹凸の程度を増す（工程ｄ）。この凹凸が増幅された溶
射皮膜１５の表面に、例えば、フッ素樹脂のエナメル液
を一様にスプレー塗りした後焼成する（工程（ｅ））。
この過程で、フッ素樹脂は、溶射皮膜１５の表面に開口
した孔１５ａの内部に浸入付着し、この孔１５ａに浸入
付着したフッ素樹脂が一種のアンカーのようになって、
コーティング層１６が形成される。そして、開弁状態で
のシール性を向上させるため、弁体４の弁孔１４の両端
の外周縁とシートリング５の内端面とが擦り合わせが行
われ（工程（ｆ））、前述の擦り合わせ部４ａ（図１参
照）が形成される。また、同様に閉弁状態でのシール性
を向上させるため弁孔１４の開口端から９０°離れた位
置においても行われ、前述の擦り合わせ部４ｂが形成さ
れる。各擦り合わせ部４ａ、４ｂにおいてはフッ素樹脂
のコーティング層１６が剥がれて、溶射皮膜が露出しそ
の表面の孔１５ａにフッ素樹脂の一部が浸入付着した状
態となる。3A to 3F, a spray coating 15 of the self-fluxing alloy is formed on the ball-shaped valve body 4, and a coating layer 16 of the fluororesin is formed on the spray coating 15. It shows the process. First, a self-fluxing alloy such as nickel base is ejected from the nozzle 21 onto the surface of the base material of the ball-shaped valve body 4 to form the sprayed coating 15 (step (a)), and the dimensional accuracy of the valve body 4 is secured. In order to
The surface of the thermal spray coating 15 is spherically cut by the cutting tool 22 (step (b)), then spherically ground by the grinding tool 23 (step (c)), and thereafter, in order to easily attach the fluororesin. Then, a sand blasting process of spraying sand grains 25 is performed to increase the degree of unevenness of the porous portion of the surface layer of the thermal spray coating 15 (step d). For example, the surface of the sprayed coating 15 in which the irregularities are amplified is uniformly spray-coated with an enamel liquid of fluororesin and then baked (step (e)).
In this process, the fluororesin infiltrates and adheres inside the hole 15a opened on the surface of the thermal spray coating 15, and the fluororesin invading and adhering to the hole 15a becomes a kind of anchor,
The coating layer 16 is formed. Then, in order to improve the sealing property in the valve open state, the outer peripheral edges of both ends of the valve hole 14 of the valve body 4 and the inner end surface of the seat ring 5 are rubbed (step (f)), and the above-mentioned rubbing is performed. The mating portion 4a (see FIG. 1) is formed. Further, similarly, in order to improve the sealing property in the valve closed state, the process is also performed at a position 90 ° away from the opening end of the valve hole 14 to form the abraded portion 4b. In each of the rubbing portions 4a and 4b, the fluororesin coating layer 16 is peeled off to expose the sprayed coating, and a part of the fluororesin infiltrates and adheres to the holes 15a on the surface.
【００２５】なお、弁体４は、前記の擦り合わせ部４ａ
と４ｂの間で両側のシートリング５，５と摺接しながら
回転する。その回転の際に摺接する部分で擦り合わせ部
４ａ、４ｂ以外の部分を摺接面４ｃと称する。The valve body 4 has the above-mentioned rubbing portion 4a.
And 4b, while rotating in sliding contact with the seat rings 5, 5 on both sides. The portion other than the rubbing portions 4a and 4b which is brought into sliding contact during the rotation is referred to as a sliding contact surface 4c.
【００２６】上記の擦り合わせ部４ａ、４ｂと摺接部４
ｃの組織の状態を知るために、これらの部分を走査型電
子顕微鏡（ＳＥＭ）で観察したので、擦り合わせ部４ａ
の部分のＳＥＭ写真を図４（ａ）に示し、摺接部分４ｃ
の部分のＳＥＭ写真を図４（ｂ）に示す。The above-mentioned rubbing portions 4a and 4b and the sliding contact portion 4
These portions were observed with a scanning electron microscope (SEM) in order to know the state of the tissue of c.
Fig. 4 (a) shows the SEM photograph of the part of Fig.
An SEM photograph of the portion is shown in FIG.
【００２７】図４（ａ）において、×印で示したａ点は
溶射皮膜１５の孔１５ａの部分であり、その孔１５ａの
内部が黒く見えているのが浸入付着したフッ素樹脂であ
る。また、×印で示したｂ点は、擦り合せにより露出し
た溶射皮膜１５部分である。図４（ｂ）において×印と
その近傍に黒い部分が広く現れている。この黒い部分は
フッ素樹脂である。In FIG. 4 (a), the point a shown by X is the portion of the hole 15a of the thermal spray coating 15, and the inside of the hole 15a looks black is the infiltrated fluororesin. Further, point b shown by X is the sprayed coating 15 portion exposed by rubbing. In FIG. 4B, a black portion widely appears in the X mark and its vicinity. This black portion is fluororesin.
【００２８】図５（ａ）から（ｃ）は、前記のａ点、ｂ
点及びｃ点の部分の成分をエネルギー分散型Ｘ線分析
（ＥＤＸ）による分析結果である。ａ点とｃ点において
はフッ素（Ｆ）のピークが認められるが、ｂ点において
は認められない。この分析結果から、擦り合わせ部４
ａ、４ｂにおいては、露出した溶射皮膜１５が露出して
おり、その溶射皮膜１５のポーラス部の多数の複雑な形
状の孔１５ａにフッ素樹脂が浸入付着していること、ま
た、摺接部４ｃにおいては面的に拡がったフッ素樹脂の
コーティング層１６が存在することが確認された。FIGS. 5 (a) to 5 (c) show points a and b described above.
It is the analysis result by the energy dispersive X-ray analysis (EDX) of the components of the points and points c. Fluorine (F) peaks are observed at points a and c, but not at point b. From this analysis result, the rubbing section 4
In a and 4b, the exposed thermal spray coating 15 is exposed, and the fluororesin infiltrates and adheres to many holes 15a having a complicated shape in the porous portion of the thermal spray coating 15, and the sliding contact portion 4c. In, it was confirmed that the coating layer 16 of the fluororesin which spreads in a plane exists.
【００２９】図６（ａ）は、前記弁体４の擦り合わせ部
４ａにシートリング５の内端面５ａが合致した開弁状態
を示したものである。擦り合わせ部４ａにおいては、フ
ッ素樹脂のコーティング層１６が剥離されて自溶性合金
の溶射皮膜１５が露出しているが、その露出部分のポー
ラス部の孔１５ａにフッ素樹脂１６ａが浸入付着してお
り、その面にシートリング５の内端面５ａの溶接肉盛層
１７が接触している状況を示す。孔１５ａ内のフッ素樹
脂１６ａは、コーティングの際に浸入してコーティング
層１６のアンカーをなしていた部分が残留したものと認
められるが、使用が進んだ状態では、フッ素樹脂の摩耗
粉が後から浸入して付着する場合もあるが、いすれも弁
体４の回転の潤滑作用に寄与する。FIG. 6 (a) shows a valve open state in which the inner end surface 5a of the seat ring 5 is aligned with the rubbed portion 4a of the valve body 4. In the abraded portion 4a, the fluororesin coating layer 16 is peeled off to expose the spray coating 15 of the self-fluxing alloy, but the fluororesin 16a penetrates and adheres to the hole 15a of the porous portion in the exposed portion. Shows a state in which the weld overlay 17 of the inner end surface 5a of the seat ring 5 is in contact with the surface. It is recognized that the fluororesin 16a in the holes 15a penetrated during the coating to leave the anchoring portion of the coating layer 16, but in the state of advanced use, the abrasion powder of the fluororesin was later generated. There is a case where it invades and adheres, but any of them contributes to the lubricating action of the rotation of the valve body 4.
【００３０】図６（ｂ）は、弁体４が回転した場合のシ
ートリング５との摺接範囲を一点鎖線で示している。こ
の摺接範囲には、前記擦り合わせ部４ａ、４ｂとこれら
以外の摺接部４ｃが含まれる。この摺接部４ｃは擦り合
わせは行われないので、コーティング層１６はそのまま
残留しているが、弁体４の回転に伴い次第に摩耗する
が、その摩耗粉が潤滑作用をなす。また、その一部が、
擦り合わせ部４ａ、４ｂの孔１５ａに浸入付着する。FIG. 6 (b) shows the range of sliding contact with the seat ring 5 when the valve body 4 rotates by a chain line. This sliding contact range includes the rubbing portions 4a and 4b and the sliding contact portion 4c other than these. Since the sliding contact portion 4c is not rubbed, the coating layer 16 remains as it is, but the coating layer 16 gradually wears as the valve body 4 rotates, but the wear powder has a lubricating effect. Also, part of it
It penetrates and adheres to the holes 15a of the rubbing portions 4a and 4b.
【００３１】このように、摺接部４ｃは、そのコーティ
ング層１６がフッ素樹脂の供給源となり、長期にわたり
潤滑作用を発揮する一つの要因となっている。As described above, the coating layer 16 of the sliding contact portion 4c serves as a supply source of the fluororesin, which is one factor for exerting the lubricating action for a long period of time.
【００３２】図８はトルク特性の比較実験結果である。
同図は横軸に開閉往復１回を単位とする作動回数、縦軸
に弁トルクを示す。（１）のグラフは前記実施形態のも
のであり「自溶性合金の溶射十フッ素樹脂コーティン
グ」として示す。また、（２）は「自溶性合金の溶射」
のみの場合、（３）は「硬質クロムメッキ処理」した場
合を示す。（２）（３）は従来例である。FIG. 8 shows the results of comparative experiments of torque characteristics.
In the figure, the horizontal axis shows the number of operations in the unit of opening and closing reciprocation, and the vertical axis shows the valve torque. The graph of (1) corresponds to that of the above-mentioned embodiment and is shown as “spray-coated fluorocarbon resin coating of self-fluxing alloy”. Also, (2) is "spraying of self-fluxing alloy"
In the case of only, (3) shows the case where "hard chrome plating treatment" is performed. (2) and (3) are conventional examples.
【００３３】上記の比較実験結果から明らかなように、
従来の場合は作動回数が１００００回到達前に弁トルク
が急上昇するのに対し、前記実施形態の場合は５０００
０回に達しても弁トルクが初期状態から殆ど上昇せず、
安定した状態が保たれる。As is clear from the results of the above comparative experiment,
In the conventional case, the valve torque sharply increases before the number of operations reaches 10,000 times, whereas in the case of the above embodiment, the valve torque increases to 5000 times.
Even if it reaches 0 times, the valve torque hardly rises from the initial state,
It remains stable.
【００３４】上述の実施形態において、シートリング５
の内端面５ａに耐摩耗性に優れたステライトの肉盛層１
７を設けており、このステライト肉盛層１７と、弁体４
のフッ素樹脂をコーティングした溶射皮膜１５との間に
硬度差が存在し、この硬度差は、前述の齧りを防止し
て、弁体４とシートリング５との摺動性の改善に寄与す
る。具体的な硬度の一例は次の通りである。自溶性合金
溶射皮膜：Ｈｖ６５０、硬質クロムメッキ：Ｈｖ７５
０、ステライト溶射肉盛：Ｈｖ４５０である。In the above embodiment, the seat ring 5
Stellite overlay 1 with excellent wear resistance on the inner end surface 5a of the
7 is provided, and the stellite buildup layer 17 and the valve body 4 are provided.
There is a hardness difference with the thermal spray coating 15 coated with the fluororesin, and this hardness difference prevents the above-mentioned bite and contributes to the improvement of the slidability between the valve body 4 and the seat ring 5. An example of specific hardness is as follows. Self-fluxing alloy spray coating: Hv650, hard chrome plating: Hv75
0, Stellite thermal spray overlay: Hv450.
【００３５】なお、以上の実施形態は２方弁について述
べたが、３方弁、４方弁の場合でも同様のことが言え
る。図７（ａ）（ｂ）は４方弁の場合を示す。この場合
は、前述のような閉弁状態は存在せず、波線で示すよう
に、弁体４が９０°回転することにより流路の切替えが
行われる。擦り合わせ部４ａは２ケ所の弁孔１４，１４
の各端部に形成される。Although the above embodiment has been described with respect to the two-way valve, the same can be said for the three-way valve and the four-way valve. 7A and 7B show the case of a 4-way valve. In this case, the valve closed state as described above does not exist, and the flow path is switched by rotating the valve body 4 by 90 ° as shown by the broken line. The rubbing portion 4a has two valve holes 14, 14
Is formed at each end of the.
【００３６】[0036]
【発明の効果】以上のように、この発明によれば、ボー
ル弁の弁体に付与した高硬度で耐摩耗性に優れた硬質合
金の溶射皮膜の上に、摺動性に優れたフッ素樹脂をコー
ティングしたので、このフッ素樹脂が溶射皮膜の表面の
ポーラス部に浸入付着して、自己潤滑作用を発揮する。
これにより、弁体開閉トルクが初期状態から殆ど上昇せ
ず、安定した状態が保たれ、弁体とシートリングとの摺
動性が著しく改善される。As described above, according to the present invention, a fluororesin having excellent slidability is formed on the sprayed coating of a hard alloy having high hardness and excellent wear resistance applied to the valve body of the ball valve. Since this is coated, this fluororesin infiltrates and adheres to the porous portion on the surface of the thermal spray coating to exert a self-lubricating effect.
As a result, the valve body opening / closing torque hardly increases from the initial state, the stable state is maintained, and the slidability between the valve body and the seat ring is significantly improved.
【００３７】また、シートリングの内端面に設けたステ
ライトなどの耐摩耗性に優れた溶接肉盛層と、フッ素樹
脂をコーティングした弁体の溶射皮膜との間に存在する
硬度差も、齧りを防止して摺動性を改善するのに寄与す
る。Further, the hardness difference existing between the weld overlay layer having excellent wear resistance such as stellite provided on the inner end surface of the seat ring and the thermal spray coating of the valve body coated with fluororesin causes a bite. It contributes to prevention and improvement of slidability.
【００３８】これらによって、無潤滑下で、作動回数が
増加しても弁体の開閉が円滑に行われ、ボール弁寿命も
向上する。As a result, the valve body can be smoothly opened and closed without lubrication even if the number of operations is increased, and the ball valve life is also improved.
【図１】実施形態の弁体の斜視図FIG. 1 is a perspective view of a valve body according to an embodiment.
【図２】同上の弁体を使用したボール弁の縦断正面図FIG. 2 is a vertical sectional front view of a ball valve using the valve element of the above.
【図３】（ａ）〜（ｆ）同上の弁体の製造工程の説明図FIG. 3 (a) to (f) are explanatory views of a manufacturing process of the valve body of the above.
【図４】（ａ）（ｂ）同上の弁体のＳＥＭ写真4 (a) and (b) are SEM photographs of the valve element of the same.
【図５】（ａ）〜（ｃ）同上の弁体の成分元素分析結果5 (a) to (c) Results of elemental elemental analysis of the valve element of the above.
【図６】（ａ）同上の弁体とシートリングとの摺接状態
を示す拡大断面図
（ｂ）同上の弁体の正面図FIG. 6A is an enlarged cross-sectional view showing a sliding contact state between the valve element and the seat ring of the above, and FIG. 6B is a front view of the valve element of the same.
【図７】（ａ）４方弁の横断平面図 （ｂ）（ａ）図の一部拡大図FIG. 7A is a cross-sectional plan view of a 4-way valve. (B) Partly enlarged view of (a)
【図８】弁トルクの比較実験結果のグラフFIG. 8 is a graph of a comparison test result of valve torque.
【図９】（ａ）従来のボール弁の断面図 （ｂ）同上の弁体の斜視図FIG. 9A is a sectional view of a conventional ball valve. (B) A perspective view of the above valve body
１ 弁箱 ２ 開口部 ３ 弁室 ４ 弁体 ４ａ 擦り合わせ部 ４ｂ 擦り合わせ部 ４ｃ 摺接部 ５ シートリング ５ａ 内端面 ６ 押えリング ７ 押圧ばね ８ 開口部 ９ ボンネット １０ 弁軸 １０ａ 角柱部 １１ 操作レバー １２ 小軸 １３ 軸受孔 １４ 弁孔 １５ 溶射皮膜 １５ａ 孔 １６ コーティング層 １７ 溶接肉盛層 1 valve box 2 openings 3 valve chambers 4 valve body 4a rubbing part 4b rubbing part 4c Sliding contact part 5 seat ring 5a inner end surface 6 Presser ring 7 Pressing spring 8 openings 9 bonnet 10 valve shaft 10a prismatic part 11 Operation lever 12 small axes 13 Bearing hole 14 valve holes 15 Thermal spray coating 15a hole 16 coating layer 17 Weld overlay
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3H054 AA03 BB02 BB12 BB20 BB22 CA26 CA39 CD07 EE04 4K031 AA02 AB02 CB30 FA04 FA09 ─────────────────────────────────────────────────── ─── Continued front page F term (reference) 3H054 AA03 BB02 BB12 BB20 BB22 CA26 CA39 CD07 EE04 4K031 AA02 AB02 CB30 FA04 FA09
Claims (5)
体であって、該弁体に設けた弁孔が流路の出入り口に嵌
合されたシートリングと合致して開弁状態となり、その
状態から所要角度回転して閉弁状態又は流路切替え状態
となるにボール弁用弁体において、前記弁体の表面に硬
質合金の溶射処理による溶射皮膜を形成し、その溶射皮
膜にフッ素樹脂のコーティング層を形成し、このコーテ
ィング層の一部を前記溶射皮膜のポーラス部に浸入付着
せしめたことを特徴とするボール弁用弁体。1. A ball-shaped valve body housed in a valve chamber in a valve box, wherein a valve hole provided in the valve body coincides with a seat ring fitted in an inlet / outlet of a flow path to open the valve. In the ball valve valve body, a sprayed coating is formed on the surface of the valve body by spraying a hard alloy, and the sprayed coating is formed on the surface of the valve body. A valve element for a ball valve, characterized in that a coating layer of a fluororesin is formed on and a part of the coating layer is made to infiltrate and adhere to the porous portion of the thermal spray coating.
特徴とする請求項１に記載のボール弁用弁体。2. The valve body for a ball valve according to claim 1, wherein the hard alloy is a self-fluxing alloy.
に、ブラスト処理を施してからフッ素樹脂コーティング
を行うことを特徴とする請求項１または２に記載のボー
ル弁用弁体。3. The valve element for a ball valve according to claim 1, wherein the sprayed coating formed on the surface of the valve element is subjected to a blasting treatment and then a fluororesin coating.
部に前記フッ素樹脂のコーティング層を剥離し溶射皮膜
が露出した擦り合わせ部を形成し、該擦り合わせ部を形
成する前記溶射皮膜のポーラス部に前記フッ素樹脂の一
部を残存せしめたことを特徴とする請求項１から３のい
ずれかに記載のボール弁用弁体。4. A rubbed portion in which the coating layer of the fluororesin is peeled off to expose the sprayed coating is formed on a part of the valve body to which the seat ring is adhered, and the sprayed coating forming the rubbed portion is formed. The ball valve valve element according to any one of claims 1 to 3, wherein a part of the fluororesin is left in the porous portion.
たフッ素樹脂のコーティング層が、弁体の回転時にシー
トリングとの摺接部となり、該摺接部がフッ素樹脂の供
給源となることを特徴とする請求項４に記載のボール弁
用弁体。5. The fluororesin coating layer formed on a portion other than the rubbing portion serves as a sliding contact portion with the seat ring when the valve body rotates, and the sliding contact portion serves as a fluororesin supply source. The valve body for a ball valve according to claim 4, wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002183625A JP3947051B2 (en) | 2002-05-17 | 2002-05-17 | Ball valve disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002183625A JP3947051B2 (en) | 2002-05-17 | 2002-05-17 | Ball valve disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003336752A true JP2003336752A (en) | 2003-11-28 |
| JP3947051B2 JP3947051B2 (en) | 2007-07-18 |
Family
ID=29707188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002183625A Expired - Fee Related JP3947051B2 (en) | 2002-05-17 | 2002-05-17 | Ball valve disc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3947051B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100786038B1 (en) * | 2007-06-08 | 2007-12-17 | (주)플로닉스 | Ball for valve and lining method |
| KR101243677B1 (en) | 2012-08-24 | 2013-03-15 | 주식회사 동양밸브 | Method of treating a valve surface with enhanced durability |
| JP2013083357A (en) * | 2013-01-11 | 2013-05-09 | Norgren Ltd | Ball valve disconnector |
| CN104213119A (en) * | 2014-08-27 | 2014-12-17 | 江苏神通阀门股份有限公司 | Spray welding method for spherical surface of spherical valve |
| KR101545720B1 (en) | 2013-12-24 | 2015-08-20 | 주식회사 포스코 | DEVICE FOR PREVENTING DAMAGE OF SEAL OF SEALIMG VALVE FOR melting FURNACE |
| CN116474995A (en) * | 2023-04-28 | 2023-07-25 | 沧州鑫圆通不锈钢制品有限公司 | Spraying device and process for spraying wear-resistant material on surface of valve ball |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104911532A (en) * | 2014-08-27 | 2015-09-16 | 江苏神通阀门股份有限公司 | Conveniently-operated ball surface spray welding device for ball valve |
-
2002
- 2002-05-17 JP JP2002183625A patent/JP3947051B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100786038B1 (en) * | 2007-06-08 | 2007-12-17 | (주)플로닉스 | Ball for valve and lining method |
| KR101243677B1 (en) | 2012-08-24 | 2013-03-15 | 주식회사 동양밸브 | Method of treating a valve surface with enhanced durability |
| JP2013083357A (en) * | 2013-01-11 | 2013-05-09 | Norgren Ltd | Ball valve disconnector |
| KR101545720B1 (en) | 2013-12-24 | 2015-08-20 | 주식회사 포스코 | DEVICE FOR PREVENTING DAMAGE OF SEAL OF SEALIMG VALVE FOR melting FURNACE |
| CN104213119A (en) * | 2014-08-27 | 2014-12-17 | 江苏神通阀门股份有限公司 | Spray welding method for spherical surface of spherical valve |
| CN116474995A (en) * | 2023-04-28 | 2023-07-25 | 沧州鑫圆通不锈钢制品有限公司 | Spraying device and process for spraying wear-resistant material on surface of valve ball |
| CN116474995B (en) * | 2023-04-28 | 2024-03-08 | 沧州鑫圆通不锈钢制品有限公司 | Spraying device and process for spraying wear-resistant material on surface of valve ball |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3947051B2 (en) | 2007-07-18 |
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