JP2021107730A - Valve body and valve - Google Patents

Abstract

To stabilize sealing performance of a metal seal region in a valve body, by solving a problem that it is difficult to simultaneously achieve both of securement of a sealing surface pressure and strength of a body garment portion as there is a tendency of degradation of the sealing performance when a fastening torque is increased, due to a conflicting relation of the strength of the body garment portion and the sealing performance on the metal seal region of the valve body.SOLUTION: In a valve body 2 obtained by joining a flow channel of a cap 4 and a flow channel of a body 3 to form a communication flow channel, an end surface around a flow channel opening of any one of the cap 4 and the body 3 is kept into contact with an end surface around a flow channel opening at the other side to form an annular seal surface 21, one of the opposed end surfaces configuring the annular seal surface is provided with a plurality of annular projecting portions 32 substantially formed into a concentric circular shape in a manner of surrounding the flow channel opening, and the other end surface has a planar shape.SELECTED DRAWING: Figure 2

Description

本発明は、バルブボデーとバルブに関し、具体的には、メタルシール部位のシール性能における安定化を図ったバルブボデーとバルブに関する。 The present invention relates to a valve body and a valve, and specifically to a valve body and a valve in which the sealing performance of a metal seal portion is stabilized.

一般に、ボールバルブやその他の各種のバルブは、弁体を弁箱に内蔵し、弁体を収容したボデーとキャップとを締結して弁箱（バルブボデー）を構成している。そして、ボデーとキャップを締結する際に、締結部位にガスケットを介在させたり、メタルタッチで封止する場合がある。 Generally, in ball valves and various other valves, a valve body is built in a valve box, and a body containing the valve body and a cap are fastened to form a valve box (valve body). Then, when fastening the body and the cap, a gasket may be interposed at the fastening portion or the cap may be sealed with a metal touch.

後者のメタルタッチで封止する場合としては、例えば、特許文献１や特許文献２に記載されたボールバルブが挙げられる。 Examples of the latter case of sealing with a metal touch include ball valves described in Patent Document 1 and Patent Document 2.

このメタルタッチの構造は、フラット形状の端面（胴着面）を有する胴着部を備えたボデーとフラット形状の接合面（端面）を有する鍔部（接合部）を備えたキャップにより成り、キャップをボデーにねじ込んで、キャップの鍔部の接合面を胴着部の胴着面に突き当て密着させて封止面圧を発生させて、メタルシールによって封止している。 The structure of this metal touch consists of a body having a bodice having a flat end face (boiling surface) and a cap having a flange (joining part) having a flat joint surface (end face), and the cap is a body. The joint surface of the collar portion of the cap is abutted against the bodice surface of the bodice portion to bring it into close contact with the body to generate a sealing surface pressure, and the cap is sealed with a metal seal.

特開２００５−２３３３９５号公報Japanese Unexamined Patent Publication No. 2005-233395 特開昭５０−１２２７２６号公報Japanese Unexamined Patent Publication No. 50-122726

しかし、このメタルタッチのシール構造には、次に示すような課題を有しその課題の解決が望まれていた。すなわち、胴着面に面圧を発生させるためにボデーにキャップを締付けるが、胴着部においてフラット形状の胴着面での面圧は、接合面と接触する胴着面の面積に反比例しており、また、胴着部の胴着面での接触幅が広くなるほど、キャップをボデーにねじ込むときの締付けトルクが大きくなる。 However, this metal touch seal structure has the following problems, and it has been desired to solve the problems. That is, the cap is tightened on the body to generate surface pressure on the bodice surface, but the surface pressure on the bodice surface having a flat shape at the bodice is inversely proportional to the area of the bodice surface in contact with the joint surface. The wider the contact width of the bodice on the bodice surface, the greater the tightening torque when the cap is screwed into the body.

そして、キャップを過度にボデーにねじ込むと、図６に示すようにボデー側で雄ねじのねじ角度に沿うように、ボデーの胴着部７１は外方に広がるように変形して、胴着面７３の面圧分布が不均一になり、メタルタッチのメタルシール部位におけるシール構造７０で、鍔部（接合部）７２と胴着部７１の密着による封止面圧が低下してしまう。また、胴着部の過度な変形は、胴着部に破損や亀裂を生じるおそれがあることから、胴着部７１の肉厚は一定以上確保する必要がある。 Then, when the cap is excessively screwed into the body, the bodice portion 71 of the body is deformed so as to spread outward so as to follow the screw angle of the male screw on the body side as shown in FIG. 6, and the surface of the bodice surface 73. The pressure distribution becomes non-uniform, and the sealing structure 70 at the metal seal portion of the metal touch reduces the sealing surface pressure due to the close contact between the flange portion (joint portion) 72 and the bodice portion 71. Further, since excessive deformation of the bodice portion may cause damage or cracks in the bodice portion, it is necessary to secure a certain wall thickness or more of the bodice portion 71.

ところが、封止性能と耐圧強度を確保するために、胴着部７１を肉厚にすれば胴着面７３の接触幅が広がることになり、肉厚化に伴って胴着面７３における面圧が低下することになり、封止性能が低下する。 However, if the bodice portion 71 is made thicker in order to secure the sealing performance and the pressure resistance strength, the contact width of the bodice surface 73 is widened, and the surface pressure on the bodice surface 73 decreases as the wall thickness is increased. Therefore, the sealing performance is lowered.

このように、従来の構造においては、胴着部の強度と封止性能とが相反する関係にあることから、締付けトルクを大きくすると封止性能が低下しやすいという傾向があり、封止面圧の確保と胴着部の強度の両立が難しい。 As described above, in the conventional structure, since the strength of the bodice and the sealing performance are in a contradictory relationship, the sealing performance tends to decrease when the tightening torque is increased, and the sealing surface pressure tends to decrease. It is difficult to secure both the strength of the bodice and the strength of the bodice.

すなわち、フラット形状の接合面（胴着面）を有する胴着部にキャップを締付けする際に、シール性能を保持するには大きな締付けトルクが必要となり、ボデー側とキャップ側とに変形を生じやすく、胴着部における面圧分布が不均一になり、メタルシール部位での封止性能が安定しないという課題があった。特に、バルブのボデーはキャップよりも不均等な形状であるから、胴着面に不均一な力が加わりやすくメタルシール部位での封止性能が不安定になる傾向がある。 That is, when the cap is tightened to the bodice portion having the flat joint surface (boiling surface), a large tightening torque is required to maintain the sealing performance, and the body side and the cap side are easily deformed, and the bodice is attached. There is a problem that the surface pressure distribution in the portion becomes non-uniform and the sealing performance at the metal seal portion is not stable. In particular, since the valve body has a more uneven shape than the cap, an uneven force is likely to be applied to the bodice surface, and the sealing performance at the metal seal portion tends to be unstable.

そこで、本発明は上記課題を解決するために開発されたものであり、その目的とするところは、バルブボデーのシール構造におけるメタルシール部位の封止性能の安定化を図ることにある。 Therefore, the present invention has been developed to solve the above problems, and an object of the present invention is to stabilize the sealing performance of the metal seal portion in the seal structure of the valve body.

上記目的を達成するため、請求項１に係る発明は、キャップの流路とボデーの流路とを連通して連通流路を形成するように接合してなるバルブボデーであって、キャップ及びボデーのいずれか一方の流路開口の周囲の端面が、他方側の流路開口の周囲の端面に当接して環状シール面が形成されると共に、環状シール面を構成する対向端面のうちいずれか一方には、流路開口をとり囲むように複数の環状突部が略同心円状に形成されて、他方の端面は平面状であるバルブボデーである。 In order to achieve the above object, the invention according to claim 1 is a valve body formed by communicating the flow path of the cap and the flow path of the body so as to form a communication flow path, and the cap and the body. The end face around the flow path opening on the other side abuts on the end face around the flow path opening on the other side to form an annular seal surface, and one of the opposing end faces constituting the annular seal surface. Is a valve body in which a plurality of annular protrusions are formed substantially concentrically so as to surround the flow path opening, and the other end face is flat.

請求項２に係る発明は、キャップとボデーは互いにねじ込みによって接合され、ねじ込みの力によって環状シール面を構成する対向端面に押し付け合う力が付加されるようにしたバルブボデーである。 The invention according to claim 2 is a valve body in which a cap and a body are joined to each other by screwing, and a force of pressing against the opposing end faces constituting the annular sealing surface is applied by the screwing force.

請求項３に係る発明は、キャップの流路開口付近の外周に設けた雄ねじ部を、ボデーの流路開口付近の内周に設けた雌ねじ部にねじ込むことにより、キャップとボデーとは接合されて、キャップの雄ねじ部後端の端面と、ボデーの雌ねじ部の開口側の端面とが当接して環状シール面を形成するバルブボデーである。 In the invention according to claim 3, the cap and the body are joined by screwing a male screw portion provided on the outer periphery of the cap near the flow path opening into a female screw portion provided on the inner circumference near the flow path opening of the body. , A valve body in which the end surface of the rear end of the male threaded portion of the cap and the end surface of the female threaded portion of the body on the opening side come into contact with each other to form an annular sealing surface.

請求項４に係る発明は、環状突部の断面形状において、他方の端面に突出した先端部分の形状が、角形状、Ｒ形状、又は面形状であるバルブボデーである。 The invention according to claim 4 is a valve body in which, in the cross-sectional shape of the annular protrusion, the shape of the tip portion protruding from the other end face is a square shape, an R shape, or a surface shape.

請求項５に係る発明は、環状突部は２つ形成されており、その外周側の環状突部の先端部分の形状は、面形状であり、一方の内周側の環状突部の先端部分の形状は、角形状である、バルブボデーである。 In the invention according to claim 5, two annular protrusions are formed, and the shape of the tip portion of the annular protrusion on the outer peripheral side thereof is a surface shape, and the tip portion of the annular protrusion on the inner peripheral side of the two is formed. The shape of is a valve body, which is a square shape.

請求項６に係る発明は、請求項１乃至５の何れか１項に記載したバルブボデーの流路内に、当該流路を開閉可能にする弁体を設けたバルブである。 The invention according to claim 6 is a valve provided with a valve body that can open and close the flow path in the flow path of the valve body according to any one of claims 1 to 5.

請求項７に係る発明は、弁体が、バルブボデーの流路と連通可能な貫通孔を有するボール弁体である、バルブである。 The invention according to claim 7 is a valve in which the valve body is a ball valve body having a through hole that can communicate with the flow path of the valve body.

請求項１に係る発明によると、耐圧容器としてのバルブボデーであって、環状シール面となる対向端面のいずれか一方に複数の環状突部を略同心円状に設けることで、キャップとボデーとを接合するときに環状突部において面圧を発生させて、環状シールを形成することができる。そのため、従来のようなフラット形状の胴着面とする場合に比べて、キャップとボデーとの接合力を小さくしても接合部分での十分なシール性を確保することができる。そして、接合力を小さくできる結果、胴着部の変形も低減することができ、環状シール面の周方向に均一な面圧を得ることが可能となる。特に、複数の環状突部を略同心円状に設けることで、複数の環状シールが形成されるので、仮にボデーの変形等があったとしてもシール性を確保しやすくなる。その結果、バルブボデーの胴着部での封止性能と耐圧性能を著しく安定させることが可能となる。 According to the invention of claim 1, it is a valve body as a pressure-resistant container, and a cap and a body are provided by providing a plurality of annular protrusions substantially concentrically on one of the facing end surfaces serving as an annular sealing surface. A surface pressure can be generated at the annular protrusion at the time of joining to form an annular seal. Therefore, as compared with the case where the bodice surface has a flat shape as in the conventional case, it is possible to secure sufficient sealing performance at the joint portion even if the joint force between the cap and the body is reduced. As a result of reducing the bonding force, it is possible to reduce the deformation of the bodice portion, and it is possible to obtain a uniform surface pressure in the circumferential direction of the annular sealing surface. In particular, by providing the plurality of annular protrusions in a substantially concentric shape, a plurality of annular seals are formed, so that even if the body is deformed, it becomes easy to secure the sealing property. As a result, it is possible to remarkably stabilize the sealing performance and the pressure resistance performance at the bodice portion of the valve body.

請求項２に係る発明によると、キャップとボデーとがねじ込みによって接合され、このねじ込みの力によって環状シール面に押し付け合う力が付加されるため、環状シール面に、環状突部によるシールに必要となる適度な面圧を加えることが容易となり、また、周方向に均一な面圧をより発生させやすくなる。 According to the invention of claim 2, the cap and the body are joined by screwing, and a force of pressing against the annular sealing surface is applied by the screwing force. Therefore, the annular sealing surface is required for sealing by the annular protrusion. It becomes easy to apply an appropriate surface pressure, and it becomes easier to generate a uniform surface pressure in the circumferential direction.

請求項３に係る発明によると、キャップ側に雄ねじ、ボデー側に雌ねじを設け、これらのねじ込みによりキャップの雄ねじ部後端の端面とボデーの雌ねじ部開口側の端面とを突き当てて環状シール面を形成することで、流路の周囲に適切に環状シール面を形成しやすくなり封止性能を高められるほか、ボデーの外形を小さくすることも可能となる。 According to the invention of claim 3, a male screw is provided on the cap side and a female screw is provided on the body side, and by screwing these, the end face of the rear end of the male screw portion of the cap and the end face of the female screw portion of the body on the opening side are abutted against each other to form an annular seal surface. By forming the above, it becomes easier to appropriately form an annular sealing surface around the flow path, the sealing performance can be improved, and the outer shape of the body can be made smaller.

請求項４に係る発明によると、環状突部の先端部分の形状が角形状、Ｒ形状又は面形状とすることができ、胴着面に必要なシール性や耐久性に応じて好ましい形状を選択することができる。 According to the invention of claim 4, the shape of the tip portion of the annular protrusion can be a square shape, an R shape, or a surface shape, and a preferable shape is selected according to the sealing property and durability required for the bodice surface. be able to.

請求項５に係る発明によると、環状突部を２つとし、外周側の先端部分を面形状とし、内周側の先端部分を角形状とすることができる。これにより、ボデーにキャップをねじ込んで接合する際に、ボデー側の雄ねじのねじ角度でボデーの胴着部付近が外方に広がるような荷重や、環状突部を押しつぶすような応力が加わるときに、外周側の面形状の環状突部が支えとなって胴着部の広がりや内周側の環状突部が押しつぶされることを抑制でき、環状突部による十分な面圧が発生するほか、変形による周方向の面圧の不均一化も生じにくくなる。その結果、強度と封止性能を両立させることが可能となり、耐圧容器としての使用価値をより高めることができる。 According to the invention of claim 5, the annular protrusion may be two, the tip portion on the outer peripheral side may be surface-shaped, and the tip portion on the inner peripheral side may be square. As a result, when the cap is screwed into the body and joined, when a load that spreads outward near the bodice of the body due to the screw angle of the male screw on the body side or a stress that crushes the annular protrusion is applied. The surface-shaped annular protrusion on the outer peripheral side can be used as a support to prevent the bodice from spreading and the annular protrusion on the inner circumference side from being crushed. Non-uniformity of the surface pressure in the direction is also less likely to occur. As a result, it is possible to achieve both strength and sealing performance, and the value in use as a pressure-resistant container can be further enhanced.

請求項６係る発明によると、本発明のバルブボデーを備えるバルブは、耐圧容器であるバルブボデーが著しく安定した封止性能を発揮することができるほか、キャップとボデーとの接合部のシール性を確保するために過剰な力を加える必要が無いため、応力による破損等が生じにくい耐久性にも優れたものとなる。 According to the sixth aspect of the present invention, in the valve provided with the valve body of the present invention, the valve body, which is a pressure-resistant container, can exhibit remarkably stable sealing performance, and the sealing property of the joint between the cap and the body can be improved. Since it is not necessary to apply an excessive force to secure the valve, the durability is excellent in that damage due to stress is unlikely to occur.

請求項７係る発明によると、弁体としてボール弁体を有するボールバルブに、特に好適である。 According to the invention of claim 7, it is particularly suitable for a ball valve having a ball valve body as the valve body.

本発明の一実施形態に係るバルブの断面図である。It is sectional drawing of the valve which concerns on one Embodiment of this invention. 本発明の実施形態に係るバルブボデーのボデーとキャップを分離した状態の斜視図である。It is a perspective view of the state which the body and the cap of the valve body which concerns on embodiment of this invention are separated. （ａ）〜（ｆ）は、本発明の実施形態のバルブボデーにおける環状突部の先端部分の形状の各例を示した説明図である。(A) to (f) are explanatory views showing each example of the shape of the tip portion of the annular protrusion portion in the valve body of the embodiment of the present invention. （ａ）、（ｂ）はそれぞれ上記先端部分の形状における他例である。(A) and (b) are other examples of the shape of the tip portion, respectively. （ａ）、（ｂ）、（ｃ）、はそれぞれ上記先端部分の形状のさらに他例である。(A), (b), and (c) are still other examples of the shape of the tip portion. 従来のメタルタッチ構造を有するバルブボデーにおける胴着部での変形を示す説明図である。It is explanatory drawing which shows the deformation in the bodice part in the valve body which has a conventional metal touch structure.

以下に、本発明におけるバルブボデーの実施形態を説明すると共に、これを適用したバルブの一例を図面に基づいて詳細に説明する。 Hereinafter, an embodiment of the valve body in the present invention will be described, and an example of a valve to which the valve body is applied will be described in detail with reference to the drawings.

図１は、本発明の一実施形態におけるバルブ（ボールバルブ）の断面図である。ボールバルブ１は、バルブボデー２と、バルブボデー２内に収容される弁体５と、ボールシート６と、ステム７と、ハンドル８とを備えて構成されている。 FIG. 1 is a cross-sectional view of a valve (ball valve) according to an embodiment of the present invention. The ball valve 1 includes a valve body 2, a valve body 5 housed in the valve body 2, a ball seat 6, a stem 7, and a handle 8.

弁体（ボール弁体）５は、球状に形成されて、貫通孔５１を有してバルブボデー２内の弁室に回転自在に収容される。弁体５は、ステム７を介して回転し、弁体５の貫通孔５１とバルブボデー２内に設けられた流路３５、４５とが連通して、流体が流通可能な連通流路を形成する。また、ステム７にはシール部材１０が装着され、ハンドル８は、ステム７上方のネジ部材９によって回動可能にバルブボデー２に固着されている。バルブボデー２には、図示しない配管器材と接続可能にするネジ部３４、４４が設けられている。 The valve body (ball valve body) 5 is formed in a spherical shape, has a through hole 51, and is rotatably housed in a valve chamber in the valve body 2. The valve body 5 rotates via the stem 7, and the through hole 51 of the valve body 5 and the flow paths 35 and 45 provided in the valve body 2 communicate with each other to form a communication flow path through which a fluid can flow. do. A seal member 10 is attached to the stem 7, and the handle 8 is rotatably fixed to the valve body 2 by a screw member 9 above the stem 7. The valve body 2 is provided with screw portions 34 and 44 that can be connected to piping equipment (not shown).

図２に示すように、本例においてバルブボデー２は、２ピース型である。キャップの流路とボデーの流路とを連通して連通流路を形成するように接合してなるバルブボデーである。略筒形状のボデー３に弁体が収容される側の端部で、流路開口付近の内周側に雌ねじ部３３を形成し、キャップ４の流路開口付近の外周側に雄ねじ部４３を形成し、雄ねじ部４３を雌ねじ部３３に螺着して、メタルシールにより封止するシール構造２０を形成する。 As shown in FIG. 2, the valve body 2 is a two-piece type in this example. It is a valve body formed by communicating the flow path of the cap and the flow path of the body so as to form a communication flow path. A female threaded portion 33 is formed on the inner peripheral side near the flow path opening at the end on the side where the valve body is housed in the substantially tubular body 3, and a male threaded portion 43 is formed on the outer peripheral side near the flow path opening of the cap 4. The male threaded portion 43 is screwed onto the female threaded portion 33 to form a seal structure 20 to be sealed with a metal seal.

すなわち、本例におけるバルブボデー２は、ガスケットが介在しないメタルシールによるシール構造２０を有する。である。キャップ４の流路開口付近の外周に設けた雄ねじ部４３を、ボデー３の流路開口付近の内周に設けた雌ねじ部３３にねじ込むことにより、キャップ４とボデー３とは接合されて、キャップ４の雄ねじ部４３後端の接合面（端面）４２と、ボデー３の雌ねじ部３３の開口側の胴着面（端面）３１とが突き当たって、環状シール面２１を形成して、封止するシール構造２０となっている。 That is, the valve body 2 in this example has a seal structure 20 with a metal seal without a gasket. Is. The cap 4 and the body 3 are joined to each other by screwing the male threaded portion 43 provided on the outer circumference of the cap 4 near the flow path opening into the female threaded portion 33 provided on the inner circumference near the flow path opening of the body 3, and the cap is capped. The joint surface (end surface) 42 at the rear end of the male threaded portion 43 of 4 abuts the bodice surface (end surface) 31 on the opening side of the female threaded portion 33 of the body 3 to form an annular seal surface 21 and seal the seal. It has a structure of 20.

本実施形態では、キャップ４とボデー３をねじ込み接合して、シール構造２０の環状シール面２１を形成する際に、締付けにより、接合面（端面）４２と胴着面（端面）３１とが突き当たるときに、一方の端面には少なくとも２点以上で接触するような環状突部を設けたことを特徴としている。
すなわち、キャップ４及びボデー３のいずれか一方の流路開口の周囲の端面が、他方側の流路開口の周囲の端面に当接して環状シール面２１を形成して、環状シール面２１を構成する対向端面（端面３１、４２）のうちいずれか一方には、流路開口をとり囲むように複数の環状突部が略同心円状に形成されて、他方の端面は平面状であることを特徴とするバルブボデーである。ここで、「流路開口の周囲の端面」とは、必ずしも、流路開口と同一平面である必要はなく、流路開口面の前方又は後方にある端面でもよい。 In the present embodiment, when the cap 4 and the body 3 are screwed together to form the annular seal surface 21 of the seal structure 20, when the joint surface (end surface) 42 and the bodice surface (end surface) 31 abut by tightening. In addition, one end face is provided with an annular protrusion that comes into contact with at least two points.
That is, the end face around the flow path opening of either the cap 4 or the body 3 abuts on the end face around the flow path opening on the other side to form the annular seal surface 21 to form the annular seal surface 21. A plurality of annular protrusions are formed substantially concentrically on one of the opposing end faces (end faces 31, 42) so as to surround the flow path opening, and the other end face is flat. It is a valve body. Here, the "end surface around the flow path opening" does not necessarily have to be the same plane as the flow path opening, and may be an end surface located in front of or behind the flow path opening surface.

図２では、胴着部３０の胴着面（端面）３１に、少なくとも２つ以上の環状突部３２を設けている。対向する接合部４１の接合面（端面）４２は平面状としている。なお、環状突部は、キャップ４の接合部の接合面に設けてもよいが、以下の説明では、胴着部３０に２つの環状突部３２を設けた例を前提として説明する。また、２つの環状突部が、接合面（端面）と接触することを、「２点接触」と称して説明することがある。 In FIG. 2, at least two or more annular protrusions 32 are provided on the bodice surface (end surface) 31 of the bodice portion 30. The joint surface (end surface) 42 of the opposing joint portions 41 is flat. The annular protrusion may be provided on the joint surface of the joint of the cap 4, but in the following description, an example in which two annular protrusions 32 are provided on the bodice portion 30 will be described. Further, the contact of the two annular protrusions with the joint surface (end surface) may be referred to as "two-point contact".

図２に示すように、ボデー３の胴着部３０の胴着面３１には、２つの環状突部３２を略同心円状に設けている。本例では、この環状突部３２は、胴着面３１の内周側及び外周側に略同心円状となるように設けている。環状突部３２同士は、必ず完全な同心円でなくてもよく、内外周に重ならないように設けられていればよい。
この環状突部３１は、キャップ４をボデー３にねじ込んで螺着していくときに、胴着面３１の内外周の環状突部３２が、キャップ４の接合部４１の端面４２と当接して、キャップ４とボデー３が接合するときに、環状突部３２から複数の環状シールが形成されるので、この環状シールより成る環状シール面２１によって、面圧を発生させることができる。 As shown in FIG. 2, two annular protrusions 32 are provided substantially concentrically on the bodice surface 31 of the bodice portion 30 of the body 3. In this example, the annular protrusion 32 is provided so as to be substantially concentric on the inner peripheral side and the outer peripheral side of the bodice surface 31. The annular protrusions 32 do not necessarily have to be completely concentric circles, and may be provided so as not to overlap the inner and outer circumferences.
When the cap 4 is screwed into the body 3 and screwed into the annular protrusion 31, the annular protrusion 32 on the inner and outer circumferences of the bodice surface 31 comes into contact with the end surface 42 of the joint 41 of the cap 4. Since a plurality of annular seals are formed from the annular protrusion 32 when the cap 4 and the body 3 are joined, a surface pressure can be generated by the annular seal surface 21 composed of the annular seals.

このように、環状突部によって複数の環状シールを形成して、環状シール面２１の周方向に均一な面圧を得ることが可能となるから、胴着部３０における胴着面３１の全体に比較的均一な面圧を発生させて、胴着部３０の胴着面３１に発生する封止面圧を安定させることができる。 In this way, since it is possible to form a plurality of annular seals by the annular protrusions and obtain a uniform surface pressure in the circumferential direction of the annular seal surface 21, it is possible to obtain a uniform surface pressure on the entire bodice surface 31 of the bodice portion 30. A uniform surface pressure can be generated to stabilize the sealing surface pressure generated on the bodice surface 31 of the bodice portion 30.

ここで、図６に示すように、従来のメタルシール部位のシール構造７０では、胴着部７１の胴着面７３がフラット形状であったため、封止面圧を発生させるときに、締付けトルクをかけてキャップをねじ込んでいくと、次第に、ボデーの胴着部７１が外方に変形していき、鍔部７２側と胴着部７１側の両方で変形が生じ、胴着部７１の胴着面７３は不均一な面圧分布となり封止面圧が安定しない。 Here, as shown in FIG. 6, in the conventional seal structure 70 of the metal seal portion, the bodice surface 73 of the bodice portion 71 has a flat shape, so that a tightening torque is applied when the sealing surface pressure is generated. As the cap is screwed in, the bodice portion 71 of the body is gradually deformed outward, deformation occurs on both the collar portion 72 side and the bodice portion 71 side, and the bodice surface 73 of the bodice portion 71 is uneven. The surface pressure is distributed and the sealing surface pressure is not stable.

なお、仮に胴着面に１つの環状突部を設けて、１点接触でのシール構造を形成する場合には、胴着面をフラット形状にしたときよりもキャップの締付けトルクを小さくすることができる利点がある。この場合、２点接触とする場合に比べると、キャップを螺着する際にねじ込みの力が、１点に集中することになり、胴着面での全体の面圧分布が均一にならず、一部に圧力が過剰に集中してしまうことがある。
このため、面圧が集中している部分よりも面圧が小さい部分から、胴着部が外方に広がるような荷重がかかったとき、胴着部の変形に対応することができないので、胴着部が外方に変形して、胴着面の全体が均一な面圧とならない場合もある。
また、ボデーの形状に応じて変形が不均一に発生したときにも、胴着面の面圧が不均一となりやすい。 If one annular protrusion is provided on the bodice surface to form a seal structure with one-point contact, the cap tightening torque can be reduced as compared with the case where the bodice surface has a flat shape. There is. In this case, as compared with the case of two-point contact, the screwing force is concentrated at one point when the cap is screwed, and the overall surface pressure distribution on the bodice surface is not uniform. Pressure may be excessively concentrated on the part.
For this reason, when a load is applied so that the bodice portion spreads outward from a portion where the surface pressure is smaller than the portion where the surface pressure is concentrated, it is not possible to cope with the deformation of the bodice portion, so that the bodice portion becomes It may be deformed outward and the entire bodice surface may not have a uniform surface pressure.
Further, even when the deformation occurs non-uniformly according to the shape of the body, the surface pressure of the bodice surface tends to be non-uniform.

このように、従来のシール構造における胴着部の胴着面をフラット形状から１点接触で接合するようなシール構造とすると、キャップの締付けトルクを小さくしつつ、封止性能を高め得るが、本例のように、少なくとも２点以上で接触するように、複数の環状突部を設けるようにすると、より一層優れた効果が得られるようになる。 In this way, if the seal structure is such that the bodice surface of the bodice portion in the conventional seal structure is joined from the flat shape by one-point contact, the sealing performance can be improved while reducing the tightening torque of the cap. As described above, if a plurality of annular protrusions are provided so as to make contact at at least two points, a further excellent effect can be obtained.

すなわち、環状突部を略同心円状に２つ以上設けることにより、一方の環状突部で変化が起きたときでも、他方の環状突部においては面圧を均一に発生させることができることから、少なくとも２点以上で接触するように、環状突部を設けている。 That is, by providing two or more annular protrusions substantially concentrically, even when a change occurs in one annular protrusion, the surface pressure can be uniformly generated in the other annular protrusion, so that at least An annular protrusion is provided so as to make contact at two or more points.

上述のように、キャップとボデーとのねじ込みによりボデーの胴着部の外方への変形が起こった場合、胴着面がフラット形状であると、接触面積が広いことから高い面圧を発生させるのが難しく、面圧が弱い箇所において漏れが生じやすい。
しかしながら、同芯円状の２つの環状突部を設けることによって、例えば、胴着部の外周側で外方に変形するような荷重が生じたときでも、外周側の環状突部が変形に対応するように変形応力を吸収して、外周側で変形しないように、環状突部で支持することができ、一方で、内周側の環状突部では、面圧を維持することができる。
また、外周側の環状突部が変形に対応するように、外周側の環状突部が支えとなることで、内周側のボデーの胴着部の変形が抑制されて、内周側の環状突部への変形の影響を少なくすることにより、この内周側の環状突部では均一かつ十分な面圧が維持されるので、胴着部の封止面圧は安定する。 As described above, when the bodice of the body is deformed outward by screwing the cap and the body, if the bodice surface has a flat shape, a high surface pressure is generated because the contact area is wide. It is difficult and leakage is likely to occur in places where the surface pressure is weak.
However, by providing the two concentric circular protrusions, for example, even when a load that deforms outward on the outer peripheral side of the bodice is generated, the annular protrusion on the outer peripheral side corresponds to the deformation. As described above, the deformation stress can be absorbed and supported by the annular protrusion so as not to be deformed on the outer peripheral side, while the surface pressure can be maintained at the annular protrusion on the inner peripheral side.
Further, by supporting the annular protrusion on the outer peripheral side so that the annular protrusion on the outer peripheral side corresponds to the deformation, the deformation of the bodice portion of the body on the inner peripheral side is suppressed, and the annular protrusion on the inner peripheral side is suppressed. By reducing the influence of deformation on the portion, a uniform and sufficient surface pressure is maintained at the annular protrusion on the inner peripheral side, so that the sealing surface pressure of the bodice portion is stable.

そして、内外周の環状突部でキャップ側の接合面４２とボデー側の環状突部３２が確実に接触することにより、面圧を生じさせることができ、封止面圧を確保して封止性能（シール性能）を維持しやすくなる。従来のように、フラット形状では、胴着部に変形が生じると、接触面圧が変化して、面圧が不均一になり、面圧が弱い箇所において漏れが生じやすくなり、封止面圧を安定させることができない。
しかしながら、２点接触であれば、内外周の環状突部の何れかで、面圧を確保することが可能になる。 Then, the joint surface 42 on the cap side and the annular protrusion 32 on the body side are surely in contact with each other at the annular protrusions on the inner and outer circumferences, so that surface pressure can be generated, and the sealing surface pressure is secured and sealed. It becomes easier to maintain the performance (seal performance). In the flat shape as in the conventional case, when the bodice is deformed, the contact surface pressure changes, the surface pressure becomes non-uniform, leakage is likely to occur in a place where the surface pressure is weak, and the sealing surface pressure is increased. It cannot be stabilized.
However, in the case of two-point contact, it is possible to secure the surface pressure at any of the annular protrusions on the inner and outer circumferences.

加えて、２点接触であれば、内外周の環状突部３２によって、２重シール（２つの環状シール）の環状シール面を形成するから、フラット形状や１点接触形状よりも安定した封止性能を確保することが可能になる。
すなわち、キャップをボデーにねじ込むことによって、ボデー側の胴着部が外方への変形するような荷重がかかっても、環状突部３２によって面圧を保持することが可能で、環状突部３２の一部で面圧が小さい箇所があっても、略同芯円状の内外周の環状突部３２と接合面４２との接合より、内周側シールと外周側シールを形成した２重シールにより、胴着部の胴着面の全体として漏れが生じにくくすることができるから、安定したシール性能を発揮することができる。 In addition, in the case of two-point contact, the annular sealing surface of the double seal (two annular seals) is formed by the annular protrusion 32 on the inner and outer circumferences, so that the sealing is more stable than the flat shape or the one-point contact shape. It becomes possible to secure the performance.
That is, by screwing the cap into the body, the surface pressure can be maintained by the annular protrusion 32 even if a load that deforms the bodice portion on the body side is applied to the outside, and the annular protrusion 32 can be maintained. Even if there is a part where the surface pressure is small, the double seal that forms the inner peripheral side seal and the outer peripheral side seal is formed by joining the annular protrusion 32 on the inner and outer circumferences that are substantially concentric and the joint surface 42. Since it is possible to prevent leakage as a whole of the bodice surface of the bodice portion, stable sealing performance can be exhibited.

このように、少なくも２つの環状突部３２を設けて２点接触するようにしているから、従来のシール構造よりも封止性能を安定化させることができる。なお、少なくも２つの環状突部を設けることによるシール性が向上するメカニズムは、上記に限定されるものではない。 In this way, since at least two annular protrusions 32 are provided so as to make contact at two points, the sealing performance can be stabilized as compared with the conventional sealing structure. The mechanism for improving the sealing property by providing at least two annular protrusions is not limited to the above.

また、本例のシール構造２０では、少なくも２つの環状突部３２を設けたことで、環状突部から環状シールが形成されて、複数の環状シールによって、胴着面に環状シール面を発生させることができて、併せて、胴着面３１の全体に発生する面圧は比較的に均一な面圧分布となり、極端に面圧が小さい箇所が生じないから、安定した封止面圧を保持することができるので、封止性能が安定する。 Further, in the seal structure 20 of this example, by providing at least two annular protrusions 32, an annular seal is formed from the annular protrusions, and the plurality of annular seals generate an annular seal surface on the bodice surface. At the same time, the surface pressure generated on the entire bodice surface 31 has a relatively uniform surface pressure distribution, and there are no places where the surface pressure is extremely small, so that a stable sealing surface pressure is maintained. Therefore, the sealing performance is stable.

また、本例のシール構造２０では、少なくも２つ以上の環状突部３２を設けて、この複数の環状突部３２から面圧を発生させるので、胴着面の一か所（１点）にのみ面圧が過剰に集中することがなく、胴着面３１の全体が比較的に均一な面圧分布となり、従来よりも著しく封止性能を安定させることができる。 Further, in the seal structure 20 of this example, at least two or more annular protrusions 32 are provided, and surface pressure is generated from the plurality of annular protrusions 32, so that the surface pressure is generated at one place (one point) on the bodice surface. Only the surface pressure is not excessively concentrated, and the entire bodice surface 31 has a relatively uniform surface pressure distribution, and the sealing performance can be remarkably stabilized as compared with the conventional case.

この環状突部３２より面圧を生じさせるときに、キャップ３とボデー４は互いにねじ込みによって接合され、ねじ込みの力によって環状シール面を構成する対向端面（胴着面３１と接合面４２）に押し付け合う力が付加されるため、環状シール面に、環状突部によるシールに必要となる適度な面圧を加えることが容易となり、また周方向に均一な面圧をより発生させやすくなる。 When surface pressure is generated from the annular protrusion 32, the cap 3 and the body 4 are joined to each other by screwing, and are pressed against the facing end surfaces (boiling surface 31 and joint surface 42) constituting the annular sealing surface by the screwing force. Since the force is applied, it becomes easy to apply an appropriate surface pressure required for sealing by the annular protrusion to the annular seal surface, and it becomes easier to generate a uniform surface pressure in the circumferential direction.

さらに、胴着部３０の胴着面３１に少なくとも２つの環状突部３２を設けたことで、この環状突部３２より面圧を生じさせることができるから、従来の構造と比較して、キャップ４をボデー３にねじ込む際に、胴着面に発生さるために必要な締付トルクが比較的小さくても、十分な封止面圧を生じさせることができ、このため、キャップを過度に締付けすることがない。 Further, since at least two annular protrusions 32 are provided on the bodice surface 31 of the bodice portion 30, surface pressure can be generated from the annular protrusion 32, so that the cap 4 can be used as compared with the conventional structure. Sufficient sealing surface pressure can be generated even if the tightening torque required to be generated on the bodice surface when screwing into the body 3 is relatively small, and therefore the cap can be overtightened. do not have.

併せて、従来の構造と比較して締付けトルクが小さくてよいので、封止面圧を発生させるために過度にキャップ４をねじ込むことがなく、ボデーのねじ角度によってボデー３の胴着部３０が外方に広がるのを抑制でき、胴着部３０が変形するのを低減することができる。加えて、応力による破損等を生じにくくすることができる At the same time, since the tightening torque may be smaller than that of the conventional structure, the cap 4 is not excessively screwed in to generate the sealing surface pressure, and the bodice portion 30 of the body 3 is removed depending on the screw angle of the body. It is possible to suppress the spread toward the direction and reduce the deformation of the bodice portion 30. In addition, it is possible to prevent damage due to stress.

そして、本例のシール構造２０では、上述のように、複数の環状シールより環状シール面を形成するから、ボデーの胴着部に変形を生じさせるような荷重がかかっても、封止面圧を保持することができる。すなわち、本例では、内外周の２つの環状突部３２によるシール構造なので、内周側又は外周側の何れか一方で応力がかかっても、封止性能を保持して胴着部の変形に対応することができる。
このため、本発明のバルブボデーを備えるバルブは、耐圧容器であるバルブボデーが著しく安定した封止性能を発揮することができるほか、キャップとボデーとの接合部のシール性を確保するために過剰な力を加える必要が無いため、応力による破損等が生じにくい耐久性にも優れたものとなる。 Further, in the seal structure 20 of this example, since the annular seal surface is formed from the plurality of annular seals as described above, the sealing surface pressure is applied even if a load that causes deformation of the bodice portion of the body is applied. Can be retained. That is, in this example, since the seal structure is formed by the two annular protrusions 32 on the inner and outer circumferences, even if stress is applied to either the inner circumference side or the outer circumference side, the sealing performance is maintained and the bodice portion can be deformed. can do.
Therefore, in the valve provided with the valve body of the present invention, the valve body, which is a pressure-resistant container, can exhibit remarkably stable sealing performance, and is excessive in order to secure the sealing property of the joint between the cap and the body. Since it is not necessary to apply a strong force, the durability is excellent in that damage due to stress is unlikely to occur.

更には、ボデー３とキャップ４をねじ込む際に、キャップ４の締付けトルクが、比較的小さなトルクでも、封止面圧が確保できるので、従来の胴着面３１がフラット形状と比較して胴着部３０を薄い肉厚にすることができる。胴着部３０が従来よりも薄い肉厚であっても、胴着面３１に面圧の不均一が起こりにくく、封止面圧を確実に保持できる。
よって、胴着部３０を従来の構造と比較して薄肉厚にすることができるから、胴着部３０を肉厚にしたことによる面圧低下の問題が解消されて、封止性能の安定に寄与する。併せて、薄肉厚化により、バルブボデーの外形を小さくすることも可能になる。 Further, when the body 3 and the cap 4 are screwed in, the sealing surface pressure can be secured even if the tightening torque of the cap 4 is relatively small, so that the conventional bodice surface 31 has a bodice portion 30 as compared with the flat shape. Can be made thin. Even if the bodice portion 30 has a thinner wall thickness than the conventional one, non-uniformity of the surface pressure does not easily occur on the bodice surface 31, and the sealing surface pressure can be reliably maintained.
Therefore, since the bodice portion 30 can be made thinner than the conventional structure, the problem of a decrease in surface pressure due to the thickening of the bodice portion 30 is solved, which contributes to the stability of the sealing performance. .. At the same time, it is possible to reduce the outer shape of the valve body by increasing the wall thickness.

このように、本発明のバルブボデーを備えるバルブは、従来における胴着面がフラット形状と比較して、胴着部３０は薄い肉厚にすることができ、胴着面３１において面圧の不均一な分布が起こりにくく、封止面圧を確実に保持できると共に、封止性能の安定化を図ることができるなどの有用な効果を発揮できる。 As described above, in the valve provided with the valve body of the present invention, the bodice portion 30 can be made thinner than the conventional bodice surface having a flat shape, and the surface pressure is unevenly distributed on the bodice surface 31. Is unlikely to occur, the sealing surface pressure can be reliably maintained, and useful effects such as stabilization of sealing performance can be exhibited.

ここで、図３（ａ）〜（ｃ）に例示するように、本例のシール構造において、環状突部３２の先端部分の形状は、（ａ）角形状３２ａ、（ｂ）面形状３２ｂ、又は（ｃ）Ｒ形状３２ｃ或いはそれぞれの組合せ形状としてもよい。所定の形状にすれば、胴着面に必要なシール性や耐久性に応じて好ましい形状を選択することができる。なお、以下、各図において、上方を外周側、下方を内周側として説明する。また、説明のために突出した形状を強調して表現しており、図面に示した形状は、一例を示すものである。 Here, as illustrated in FIGS. 3 (a) to 3 (c), in the seal structure of this example, the shape of the tip portion of the annular protrusion 32 is (a) square shape 32a, (b) surface shape 32b, Alternatively, (c) R shape 32c or a combination of the two shapes may be used. If the shape is a predetermined shape, a preferable shape can be selected according to the sealing property and durability required for the bodice surface. Hereinafter, in each drawing, the upper side will be described as the outer peripheral side and the lower side will be described as the inner peripheral side. Further, the protruding shape is emphasized for the sake of explanation, and the shape shown in the drawings is an example.

図３（ａ）角形状３２ａの場合には、接触面積が小さいため面圧を高めることができる。図３（ｂ）面形状３２ｂの場合には、胴着部の強度を高めることができる。図３（ｃ）Ｒ形状３２ｃの場合には、角形状より強度を高めることができ、かつ、面形状３２ｂよりも面圧を高めることができる。なお、角形状の場合には変形を抑制するためには、２つの環状突部は離れていることが好ましい。 FIG. 3A In the case of the square shape 32a, the surface pressure can be increased because the contact area is small. In the case of the surface shape 32b shown in FIG. 3B, the strength of the bodice portion can be increased. FIG. 3C In the case of the R shape 32c, the strength can be increased as compared with the square shape, and the surface pressure can be increased as compared with the surface shape 32b. In the case of a square shape, it is preferable that the two annular protrusions are separated from each other in order to suppress deformation.

そして、図示しないが、他例として、環状突部の先端部分の形状は、環状突部のうち内周側の環状突部３２を、外周側の環状突部３２よりややキャップ４側に突出させ、かつ、内周側の環状突部３２の先端部分の形状を角形状に形成し、外周側の環状突部３２の頂部を面形状に形成することもできる。 Although not shown, as another example, the shape of the tip portion of the annular protrusion is such that the annular protrusion 32 on the inner peripheral side of the annular protrusion is slightly projected toward the cap 4 side from the annular protrusion 32 on the outer peripheral side. Moreover, the shape of the tip portion of the annular protrusion 32 on the inner peripheral side can be formed into a square shape, and the top portion of the annular protrusion 32 on the outer peripheral side can be formed into a surface shape.

胴着部の変形は外周側から起こるから、外周側が面形状であると胴着部の変形を抑制するのに好ましく、また、内周側が角形状であると、内周側の面圧を高めるのに好適である。すなわち、外周側が面形状であるから、胴着部の外方の変形を確実に抑制することができ、胴着面全体の封止面圧を保持しつつ、内周側では、より、面圧を高めることができることから、内外周の環状突部による２重シールの効果を発揮しやすい。また、角形状の場合には変形を抑制するためには、２つの環状突部は離れていることが好ましいから、先端部分が面形状の環状突部は、最も外径側（外周側）に設けられて、かつ、先端部分が角形状の環状突部は、最も内径側（内周側）に設けられていることが好ましい。 Since the deformation of the bodice occurs from the outer peripheral side, it is preferable that the outer peripheral side has a surface shape to suppress the deformation of the bodice, and that the inner peripheral side has a square shape to increase the surface pressure on the inner peripheral side. Suitable. That is, since the outer peripheral side has a surface shape, it is possible to reliably suppress the outer deformation of the bodice portion, and while maintaining the sealing surface pressure of the entire bodice surface, the surface pressure is further increased on the inner peripheral side. Therefore, it is easy to exert the effect of the double seal by the annular protrusions on the inner and outer circumferences. Further, in the case of a square shape, in order to suppress deformation, it is preferable that the two annular protrusions are separated from each other. It is preferable that the annular protrusion portion provided and having a square tip portion is provided on the innermost side (inner circumference side).

このような形状であると、ボデー３にキャップ４をねじ込んで胴着面３１を螺着する際に、キャップ４の雄ねじ部４３のねじ角度でボデー３の胴着部３０が外方に広がるような荷重や環状突部を押しつぶすような応力がかかっても、外側の面形状の環状突部３２が支えとなることで、変形を抑制するから、ボデー３の胴着部３０は外方に広がることがなく、内周側の環状突部が押しつぶされるのを抑制することができ、環状突部により十分な面圧を発生させて、耐圧容器としての封止性能を有効に発揮することができる。
加えて、胴着部３０の変形が抑制されるので、変形による周方向の面圧の不均一が生じにくく、安定した封止性能を発揮することができる。このため、強度と封止性能を両立させることが可能となり、耐圧容器としての使用価値をより高めることができる。 With such a shape, when the cap 4 is screwed into the body 3 and the bodice surface 31 is screwed, the load is such that the bodice portion 30 of the body 3 spreads outward at the screw angle of the male screw portion 43 of the cap 4. Even if a stress such as crushing or crushing the annular protrusion is applied, the outer surface-shaped annular protrusion 32 serves as a support to suppress deformation, so that the bodice portion 30 of the body 3 does not spread outward. It is possible to prevent the annular protrusion on the inner peripheral side from being crushed, generate sufficient surface pressure from the annular protrusion, and effectively exhibit the sealing performance as a pressure-resistant container.
In addition, since the deformation of the bodice portion 30 is suppressed, non-uniformity of the surface pressure in the circumferential direction due to the deformation is unlikely to occur, and stable sealing performance can be exhibited. Therefore, it is possible to achieve both strength and sealing performance, and the value in use as a pressure-resistant container can be further enhanced.

なお、環状突部３２の先端部分の形状を上記以外の形状としてもよい。図３に示す（ｄ）外周集中形状３２ｄ、（ｅ）内周集中形状３２ｅ、（ｆ）中央集中形状３２ｆとしてもよい。
図３（ｄ）外周集中形状３２ｄの場合には、胴着部３０の外周側での応力に対応しやすくなり、また、（ｅ）内周集中形状３２ｅの場合には、胴着部３０の内周側での応力に対応しやすくなり、（ｆ）中央集中形状３２ｆの場合は、胴着面３１の面圧を中央に集中させながらも封止性能の保持を図ることができる。 The shape of the tip portion of the annular protrusion 32 may be a shape other than the above. The outer peripheral concentrated shape 32d, the inner peripheral concentrated shape 32e, and the central concentrated shape 32f shown in FIG. 3 may be used.
3 (d) In the case of the outer peripheral concentrated shape 32d, it becomes easier to deal with the stress on the outer peripheral side of the bodice portion 30, and in the case of (e) the inner peripheral concentrated shape 32e, the inner circumference of the bodice portion 30 is easily dealt with. It becomes easier to deal with stress on the side, and in the case of (f) centrally concentrated shape 32f, the sealing performance can be maintained while concentrating the surface pressure of the bodice surface 31 in the center.

また、内周、外周の環状突部３２の一方をキャップ４側に突出させてもよく、図４に示す（ａ）内周側をキャップ４側にやや突出させた形状３２ｇ、（ｂ）外周側をキャップ４側にやや突出させた形状３２ｈとしてもよい。
図４（ａ）内周側をキャップ４側にやや突出させた形状３２ｇの場合には、胴着部３０の内周側の面圧を高めることができ、（ｂ）外周側をキャップ４側にやや突出させた形状３２ｈの場合には、胴着部３０の外周側の面圧を高めることができる。この場合、突出していない側の環状突部が支えとなって、突出している側のつぶれや変形をおさえて、面圧を高めることができる。 Further, one of the annular protrusions 32 on the inner circumference and the outer circumference may be projected toward the cap 4, and the shape (a) shown in FIG. 4 is slightly projected toward the cap 4 side, and (b) the outer circumference. The shape may be 32h with the side slightly protruding toward the cap 4.
FIG. 4 (a) In the case of a shape 32 g in which the inner peripheral side is slightly projected to the cap 4 side, the surface pressure on the inner peripheral side of the bodice portion 30 can be increased, and (b) the outer peripheral side is on the cap 4 side. In the case of the slightly protruding shape 32h, the surface pressure on the outer peripheral side of the bodice portion 30 can be increased. In this case, the annular protrusion on the non-protruding side serves as a support to suppress crushing and deformation on the protruding side, and the surface pressure can be increased.

加えて、環状突部を３つ以上にしてもよい。例えば、図５に示すように、（ａ）環状突部の高さを全て同じにした形状３２ｘ、（ｂ）中央をキャップ４側にやや突出させた形状３２ｙ、（ｃ）内外周をキャップ４側にやや突出させた形状３２ｚとしてもよい。
図５（ａ）３つの環状突部の高さを全て同じにした形状３２ｘの場合には、接合面との接触点を増やして面圧を均一にしながらも、胴着部３０の封止面圧を保持することができ、（ｂ）中央をキャップ４側にやや突出させた形状３２ｙの場合には、胴着面における中央の面圧を高めながらも、胴着部３０の封止面圧を保持することができ、（ｃ）内外周をキャップ４側にやや突出させた形状３２ｚの場合には、胴着部３０の内外周側の面圧を高めつつ、胴着部３０の胴着面３１における中央の面圧も高めることができる。
さらには環状突部の先端部分の形状を角形状にする以外に、角形状、面形状、Ｒ形状などにしてもよく、これらを任意に組合せた形状であってもよい。 In addition, the number of annular protrusions may be three or more. For example, as shown in FIG. 5, (a) a shape 32x in which all the heights of the annular protrusions are the same, (b) a shape 32y with the center slightly protruding toward the cap 4, and (c) a cap 4 on the inner and outer circumferences. The shape may be 32z slightly protruding to the side.
FIG. 5 (a) In the case of the shape 32x in which the heights of the three annular protrusions are all the same, the sealing surface pressure of the bodice portion 30 is increased while increasing the contact points with the joint surface to make the surface pressure uniform. (B) In the case of the shape 32y in which the center is slightly projected toward the cap 4, the sealing surface pressure of the bodice portion 30 is maintained while increasing the surface pressure of the center on the bodice surface. In the case of (c) a shape 32z in which the inner and outer circumferences are slightly projected toward the cap 4, the central surface of the bodice portion 30 on the bodice surface 31 while increasing the surface pressure on the inner and outer peripheral sides of the bodice portion 30. The pressure can also be increased.
Further, the shape of the tip portion of the annular protrusion may be a square shape, a surface shape, an R shape, or the like, or a shape in which these may be arbitrarily combined.

以上、実施形態の説明は、胴着部３０に環状突部３２を設けた例を前提として説明したが、接合部４１の接合面４２に複数の環状突部を設けることも可能であり、上記の実施形態と同様な作用を奏することから、詳細な説明は省略する。 Although the description of the embodiment has been described on the premise that the annular protrusion 32 is provided on the bodice portion 30, it is also possible to provide a plurality of annular protrusions on the joint surface 42 of the joint portion 41. Since it has the same operation as that of the embodiment, detailed description thereof will be omitted.

また、本発明に係るシール構造を、ボールバルブのバルブボデーに適用した実施形態について説明したが、ボールバルブ以外のバタフライバルブなどその他メタルシール部位を有するバルブに適用が可能である。 Further, although the embodiment in which the seal structure according to the present invention is applied to the valve body of a ball valve has been described, it can be applied to a valve having a metal seal portion other than a ball valve such as a butterfly valve.

本発明に係るバルブボデーによれば、メタルシール部位の封止性能における安定性に優れ、メタルシール部位を有する各種のバルブに好適である。 According to the valve body according to the present invention, the stability of the sealing performance of the metal seal portion is excellent, and it is suitable for various valves having the metal seal portion.

１ ボールバルブ
２ バルブボデー
３ ボデー
４ キャップ
５ 弁体（ボール）
２０ シール構造
２１ 環状シール面
３０ 胴着部
３１ 胴着面（端面）
３２ 環状突部
３３ 雌ねじ部
４１ 接合部
４２ 接合面（端面）
４３ 雄ねじ部 1 Ball valve 2 Valve body 3 Body 4 Cap 5 Valve body (ball)
20 Seal structure 21 Circular seal surface 30 Bodice part 31 Bodice surface (end face)
32 Circular protrusion 33 Female threaded part 41 Joint part 42 Joint surface (end face)
43 Male thread

Claims (7)

キャップの流路とボデーの流路とを連通して連通流路を形成するように接合してなるバルブボデーであって、前記キャップ及び前記ボデーのいずれか一方の流路開口の周囲の端面が、他方側の流路開口の周囲の端面に当接して環状シール面が形成されると共に、前記環状シール面を構成する対向端面のうちいずれか一方には、流路開口をとり囲むように複数の環状突部が略同心円状に形成されて、他方の端面は平面状であることを特徴とするバルブボデー。 A valve body formed by communicating the flow path of the cap and the flow path of the body so as to form a communication flow path, and the end face around the flow path opening of either the cap or the body is formed. An annular seal surface is formed by abutting the end surface around the flow path opening on the other side, and a plurality of opposite end faces constituting the annular seal surface are formed so as to surround the flow path opening. A valve body characterized in that the annular protrusions of the valve body are formed substantially concentrically and the other end face is flat. 前記キャップと前記ボデーは互いにねじ込みによって接合され、ねじ込みの力によって前記環状シール面を構成する対向端面に押し付け合う力が付加されるようにした請求項１に記載したバルブボデー。 The valve body according to claim 1, wherein the cap and the body are joined to each other by screwing, and a force of pressing against the opposing end faces constituting the annular sealing surface is applied by the screwing force. 前記キャップの流路開口付近の外周に設けた雄ねじ部を、前記ボデーの流路開口付近の内周に設けた雌ねじ部にねじ込むことにより、前記キャップと前記ボデーとは接合されて、前記キャップの雄ねじ部後端の端面と、前記ボデーの雌ねじ部の開口側の端面とが当接して環状シール面を形成する請求項１又は２に記載したバルブボデー。 By screwing the male screw portion provided on the outer circumference of the cap near the flow path opening into the female screw portion provided on the inner circumference near the flow path opening of the body, the cap and the body are joined to each other, and the cap is joined. The valve body according to claim 1 or 2, wherein the end surface of the rear end of the male thread portion and the end surface on the opening side of the female thread portion of the body come into contact with each other to form an annular sealing surface. 前記環状突部の断面形状において、他方の端面に突出した先端部分の形状が、角形状、Ｒ形状、又は面形状である請求項１乃至３の何れか１項に記載したバルブボデー。 The valve body according to any one of claims 1 to 3, wherein the shape of the tip portion protruding from the other end surface in the cross-sectional shape of the annular protrusion is a square shape, an R shape, or a surface shape. 前記環状突部は２つ形成されており、その外周側の環状突部の先端部分の形状は、面形状であり、一方の内周側の環状突部の先端部分の形状は、角形状である、請求項４に記載したバルブボデー。 Two of the annular protrusions are formed, the shape of the tip of the annular protrusion on the outer peripheral side thereof is a surface shape, and the shape of the tip portion of the annular protrusion on the inner peripheral side thereof is a square shape. The valve body according to claim 4. 請求項１乃至５の何れか１項に記載したバルブボデーの流路内に、当該流路を開閉可能にする弁体を設けたバルブ。 A valve provided with a valve body capable of opening and closing the flow path in the flow path of the valve body according to any one of claims 1 to 5. 前記弁体が、バルブボデーの流路と連通可能な貫通孔を有するボール弁体である請求項６に記載のバルブ。 The valve according to claim 6, wherein the valve body is a ball valve body having a through hole that can communicate with the flow path of the valve body.

Images