JPH0953729A - Butterfly valve - Google Patents
Butterfly valveInfo
- Publication number
- JPH0953729A JPH0953729A JP22604695A JP22604695A JPH0953729A JP H0953729 A JPH0953729 A JP H0953729A JP 22604695 A JP22604695 A JP 22604695A JP 22604695 A JP22604695 A JP 22604695A JP H0953729 A JPH0953729 A JP H0953729A
- Authority
- JP
- Japan
- Prior art keywords
- stem
- rubber sheet
- thickness
- molded
- butterfly 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 76
- 230000002093 peripheral effect Effects 0.000 claims abstract description 28
- 239000013013 elastic material Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000005266 casting Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract 2
- 238000007789 sealing Methods 0.000 description 11
- 238000000465 moulding Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Lift Valve (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、弾性材料からなる
ゴムシートをボディの内径側に焼付成型したバタフライ
バルブに関し、特に、圧力１０kgf／cm2以上の条件でも
安定した性能を発揮し得るバタフライバルブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve in which a rubber sheet made of an elastic material is bake-molded on the inner diameter side of a body, and in particular, a butterfly valve capable of exhibiting stable performance even under a pressure of 10 kgf / cm 2 or more. Regarding
【０００２】[0002]
【従来の技術】一般にバタフライバルブは、図６、図７
に示すように、筒状のボディ１１と、このボディ１１の
内径側に装着される環状のゴムシート１２と、ボディの
直径方向に沿った対向位置に回転自在に装着されるステ
ム１３，１３と、このステム１３，１３に連結され、ゴ
ムシート１２内径側に回転自在に配設されるジスク１４
とで構成され、ステム１３を回転させることによりジス
ク１４を回転させて、ゴムシート１２の内周面とジスク
１４の外周面とを接離させ、バルブの開閉若しくは流量
の制御を行っている。特に、ゴムシート１２とジスク１
４とのシールは、ゴムシート１２の弾性反発力と流体の
圧力による自緊効果を併用してジスク１４の外周面をゴ
ムシート１２の内周面に圧着するので、高いシール性能
が保証されている。2. Description of the Related Art Generally, a butterfly valve is shown in FIGS.
As shown in FIG. 1, a tubular body 11, an annular rubber sheet 12 mounted on the inner diameter side of the body 11, and stems 13 and 13 rotatably mounted at opposing positions along the diametrical direction of the body. A disc 14 that is connected to the stems 13 and is rotatably disposed on the inner diameter side of the rubber sheet 12.
The disc 14 is rotated by rotating the stem 13 to bring the inner peripheral surface of the rubber sheet 12 and the outer peripheral surface of the disc 14 into contact with each other, thereby controlling the opening / closing of the valve or the flow rate. Especially, the rubber sheet 12 and the disc 1
As for the sealing with 4, since the outer peripheral surface of the disk 14 is pressed against the inner peripheral surface of the rubber sheet 12 by using the elastic repulsive force of the rubber sheet 12 and the self-tightening effect of the fluid pressure, a high sealing performance is guaranteed. There is.
【０００３】さらに、従来のバタフライバルブには、鋳
造したボディ１１を外型としてボディ１１の内側に別途
成型した内型（図示省略）を組合わせ、これら型間に弾
性材料を注入、加硫成型することによって、ゴムシート
１２を成型すると共にボディ１１の内周面に接着したも
のがあり、通常、このバタフライバルブのボディ１１は
ゴムシート１２の厚みを均等にするため内周面が加工さ
れているが、実開昭６０−６４８２４号公報に開示され
ているように、ボディ１１とゴムシート１２との接着強
度を高め、且つ、加工個所を減らしてコストを抑えるた
め、ボディ１１の内周面１１ａを加工せずに鋳放しのま
まの状態でボディ内周面１１ａにゴムシート１２を焼付
成型したものもある。Further, in the conventional butterfly valve, a cast body 11 is used as an outer mold and an inner mold (not shown) separately molded inside the body 11 is combined, an elastic material is injected between these molds, and vulcanization molding is performed. There is a type in which the rubber sheet 12 is molded and adhered to the inner peripheral surface of the body 11 by using the above method. Normally, the inner peripheral surface of the body 11 of this butterfly valve is processed in order to make the thickness of the rubber sheet 12 uniform. However, as disclosed in Japanese Utility Model Laid-Open No. 60-64824, the inner peripheral surface of the body 11 is increased in order to increase the adhesive strength between the body 11 and the rubber sheet 12 and reduce the number of processing points to reduce the cost. There is also one in which the rubber sheet 12 is baked and molded on the inner peripheral surface 11a of the body in the as-cast state without processing 11a.
【０００４】[0004]
【発明が解決しようとする課題】上記のようにゴムシー
ト１２を焼付成型したバタフライバルブのうち、ボディ
１１の内周面を加工しているものは、ゴムシート１２の
内径寸法、つぶし代及びゴムシート１２の厚さを正確に
成型することができるので、流体圧力や流速によるゴム
シート１２の変形、剥離が少なく、トルクが安定してい
るので圧力１０kgf／cm2を超える条件下で使用すること
ができる。また、ボディ１１の内周面１１ａを鋳放しの
ままにしているものは、接着強度が高く剥離しにくく、
且つ、加工工程数を減らし製造コストを抑えることがで
きるなどの利点がある。Among the butterfly valves in which the rubber sheet 12 is baked and molded as described above, the one in which the inner peripheral surface of the body 11 is processed is the inner diameter dimension of the rubber sheet 12, the crushing margin and the rubber. Since the thickness of the sheet 12 can be accurately molded, deformation and peeling of the rubber sheet 12 due to fluid pressure and flow velocity are small, and the torque is stable, so use under conditions where the pressure exceeds 10 kgf / cm 2. You can In addition, when the inner peripheral surface 11a of the body 11 is left as-cast, the adhesive strength is high and peeling is difficult,
Moreover, there is an advantage that the number of processing steps can be reduced and the manufacturing cost can be suppressed.
【０００５】しかし、ボディ１１の内周面１１ａを鋳放
しのままでゴムシート１２を焼付成型する方法は、ゴム
シート１２の内径寸法を正確に成型することができる
が、鋳物寸法公差によるボディ１１の内径誤差によっ
て、ゴムシート１２の厚さにばらつきが生じ、これと略
比例してシール性能や作動トルクが変化し、安定した性
能を得ることができない。このことは、Ｏリングのつぶ
し代がＯリングの太さに応じて規定されていることから
わかるように、同一の封止性能を得るためにはゴムシー
ト１２の厚さに応じたつぶし代が必要であり、ゴムシー
ト１２の内径やつぶし代の寸法を正確に成型しても、ゴ
ムシート１２の厚さに対するつぶし代の割合がばらつい
てしまうので、作動トルクが増加したり、シール性能が
低下する等の問題が生じてしまう。特に、ジスクにかか
る作動トルクへの影響は顕著である。However, the method of baking the rubber sheet 12 while the inner peripheral surface 11a of the body 11 is left as-cast allows the inner diameter of the rubber sheet 12 to be accurately molded, but the body 11 depends on the casting size tolerance. Due to the inner diameter error, the thickness of the rubber sheet 12 varies, and the sealing performance and the operating torque change substantially in proportion to this, and stable performance cannot be obtained. This can be seen from the fact that the crushing allowance of the O-ring is regulated according to the thickness of the O-ring, in order to obtain the same sealing performance, the crushing allowance corresponding to the thickness of the rubber sheet 12 is required. It is necessary, and even if the inner diameter of the rubber sheet 12 and the dimension of the crushing allowance are accurately molded, the ratio of the crushing allowance to the thickness of the rubber sheet 12 varies, so the operating torque increases and the sealing performance deteriorates. There will be problems such as doing. In particular, the influence on the operating torque applied to the disc is remarkable.
【０００６】これを呼び径１００Ａのバタフライバルブ
を例に説明すると、一般的にゴムシート１２の厚さが５
mm、鋳造ボディ１１内径の寸法公差が１.８mmであり、
別途成型した内型を用いて焼付成型したゴムシート１２
の厚さ寸法公差を０.０mmとすると、ゴムシート１２の
厚さは５.００±０.４５mmで、±９.０％のばらつきが
生ずることになる。Taking a butterfly valve having a nominal diameter of 100 A as an example, the rubber sheet 12 generally has a thickness of 5
mm, the dimensional tolerance of the casting body 11 inside diameter is 1.8 mm,
Rubber sheet 12 baked by using a separately molded inner mold
If the thickness dimensional tolerance is 0.0 mm, the thickness of the rubber sheet 12 is 5.00 ± 0.45 mm, which causes a variation of ± 9.0%.
【０００７】本発明は、前記問題を解決するためになさ
れたものであり、コストダウンを図りつつ、ゴムシート
の厚さのばらつきを抑えて作動トルクの増加や流体漏れ
を防止し、性能の安定したバタフライバルブを提供する
ことを目的とする。The present invention has been made in order to solve the above problems, and while reducing the cost, it is possible to suppress the variation in the thickness of the rubber sheet to prevent the increase of the operating torque and the fluid leakage, and to stabilize the performance. The purpose of the invention is to provide a butterfly valve.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、内周面を鋳放しの粗い状態のまま成型し
た略筒状のボディの内径側に、弾性材料からなる略環状
のゴムシートを焼付成型し、前記ボディの直径方向にス
テムを回転自在に装着し、さらに、前記ゴムシート内径
側に円板状のジスクを前記ステムに固定して回転自在に
配設したバタフライバルブにおいて、前記ゴムシートの
厚みが、ステム方向で鋳放し寸法公差の２.５〜３.０
倍、また、ステム垂直方向では４.０〜４.５倍となるよ
うに、ボディの内径寸法を前記ステム方向では小さく、
ステム垂直方向では大きく成型したものである。さら
に、前記ボディ内周面のステム周辺部にステムと同心円
の環状凹部を設け、この環状凹部内に前記ゴムシートを
延設させると良い。In order to achieve the above object, the present invention provides a substantially annular body made of an elastic material on the inner diameter side of a substantially cylindrical body whose inner peripheral surface is molded in an as-cast rough state. A butterfly valve in which a rubber sheet is baked and a stem is rotatably mounted in the diametrical direction of the body, and a disc-shaped disc is fixed to the stem on the inner diameter side of the rubber sheet so as to be rotatable. In the above, the thickness of the rubber sheet is as-cast dimensional tolerance of 2.5 to 3.0 in the stem direction.
Double, and the inner diameter of the body is small in the stem direction so that it becomes 4.0 to 4.5 times in the stem vertical direction,
It is a large molding in the vertical direction of the stem. Further, it is preferable to provide an annular recess concentric with the stem on the inner peripheral surface of the body on the periphery of the stem, and to extend the rubber sheet in the annular recess.
【０００９】[0009]
【作用】上記のように構成した本発明は、ボディ内径寸
法をステム方向では小さく、ステム垂直方向では大きく
成型しているので、ゴムシートの厚さをステム方向で鋳
放し寸法公差の２.５〜３.０倍、ステム垂直方向で４.
０〜４.５倍に成型することができる。According to the present invention constructed as described above, the inner diameter of the body is small in the stem direction and large in the stem vertical direction. Therefore, the thickness of the rubber sheet is as-cast in the stem direction and has an as-cast dimension tolerance of 2.5. ~ 3.0 times, 4.
It can be molded 0 to 4.5 times.
【００１０】さらに、このようにゴムシートの厚みを変
えて成型することにより、ゴムシートのステム垂直方向
の厚みのばらつきを抑え、封止性能や作動トルクを安定
させ、また、回転中心となるステムから近いゴムシート
のステム方向の厚みが作動トルクに与える影響は小さい
ので、ステム垂直方向の厚みよりも薄く成型し、ステム
周辺部分の封止性能を向上させることができる。Further, by molding the rubber sheet by changing the thickness, the variation of the thickness of the rubber sheet in the vertical direction of the stem is suppressed, the sealing performance and the operating torque are stabilized, and the stem serving as the center of rotation is formed. Since the thickness of the rubber sheet closer to the stem in the stem direction has a small effect on the operating torque, the rubber sheet can be molded thinner than the thickness in the stem vertical direction to improve the sealing performance of the peripheral portion of the stem.
【００１１】また、ステムの周辺にゴムシートを延設す
ることにより、ゴムシートのステム孔の拡がりを防止す
ることができ、ステム周辺の封止性能を向上させること
ができる。Further, by extending the rubber sheet around the stem, the expansion of the stem hole of the rubber sheet can be prevented, and the sealing performance around the stem can be improved.
【００１２】[0012]
【実施例】以下、図面を用いて本発明の実施例を詳細に
説明する。図１は本発明におけるバタフライバルブの一
実施例を示す概略縦断面図、図２は前記実施例のバタフ
ライバルブの拡大横断面図、図３は前記実施例のバタフ
ライバルブのステム周辺部の拡大縦断面図である。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing an embodiment of a butterfly valve according to the present invention, FIG. 2 is an enlarged transverse sectional view of the butterfly valve of the above embodiment, and FIG. 3 is an enlarged vertical section of a stem peripheral portion of the butterfly valve of the above embodiment. It is a side view.
【００１３】本実施例のバタフライバルブは、略筒状の
ボディ１の内周面１ａを覆ってゴムシート２を焼付成型
し、このゴムシート２のステム孔２ａ，２ａにステム
３，３をそれぞれ貫通させて、ボディ１の軸孔１ｂ，１
ｂに回転自在に装着し、さらに、円板状のジスク４を両
ステム３，３に固定してゴムシート２内径側に回転自在
に配設して形成され、ステム３を介してジスク４を回転
させることによりジスク４の外周面をゴムシート２に接
離させ、バルブの開閉若しくは流量の制御を行う。In the butterfly valve of this embodiment, the rubber sheet 2 is baked by molding while covering the inner peripheral surface 1a of the substantially cylindrical body 1, and the stems 3 and 3 are respectively inserted into the stem holes 2a and 2a of the rubber sheet 2. The shaft holes 1b, 1 of the body 1
The disc 4 is rotatably mounted, and the disc-shaped disc 4 is fixed to both the stems 3 and 3 so as to be rotatably arranged on the inner diameter side of the rubber sheet 2. By rotating the disc 4, the outer peripheral surface of the disc 4 is brought into contact with or separated from the rubber sheet 2, and the valve is opened or closed or the flow rate is controlled.
【００１４】ボディ１は、ねずみ鋳鉄，球状黒鉛鋳鉄等
の鉄鋼系材料を適宜用いて略円筒状に鋳造され、そし
て、表面に出るバリなどの除去が行われるが、内周面１
ａは加工せずに鋳放しの状態の粗い鋳肌が残される。ま
た、このボディ１の内径寸法をステム方向では小さく、
ステム垂直方向では大きく成型することにより、内周面
１ａに焼付成型するゴムシート２の厚さをステム方向で
鋳放し寸法公差の２.５〜３.０倍、ステム垂直方向で
４.０〜４.５倍に成型する。さらに、ボディ１の直径方
向に沿って対向する上部及び下部には、ステム３，３を
装着する軸孔１ｂ，１ｂが成型されている。The body 1 is cast into a substantially cylindrical shape by appropriately using a steel-based material such as gray cast iron or spheroidal graphite cast iron, and burrs and the like appearing on the surface are removed.
In case a, a rough cast surface in an as-cast state is left without processing. Also, the inner diameter of the body 1 is small in the stem direction,
The thickness of the rubber sheet 2 to be baked and molded on the inner peripheral surface 1a is as-cast in the stem direction by being largely molded in the stem vertical direction, and is 2.5 to 3.0 times the dimensional tolerance, and 4.0 in the stem vertical direction. Mold 4.5 times. Further, shaft holes 1b, 1b for mounting the stems 3, 3 are formed in an upper portion and a lower portion which face each other along the diametrical direction of the body 1.
【００１５】ゴムシート２は、ボディ１を外型とし、こ
の外型に別途成型した内型（図示省略）を組合わせ、こ
れら型間の成型空間にＮＢＲ，ＥＰＤＭ等の弾性材料を
注入、加硫成型することによって、環状ゴムシート２が
ボディ１と一体的に成型、接着される。このように成型
されたゴムシート２は、内径及びつぶし代の寸法が正確
に成型され、且つ、厚みがステム方向で鋳放し寸法公差
の２.５〜３.０倍、ステム垂直方向で４.０〜４.５倍に
成型される。また、ステム３，３を貫通させるためのス
テム孔２ａ，２ａが、軸心をボディ１の軸孔１ｂ，１ｂ
と一致させて成型されている。なお、このゴムシート２
は、使用条件に応じて適当な配合、加硫条件を選択して
成型すれば良い。In the rubber sheet 2, the body 1 is used as an outer mold, and an inner mold (not shown) separately molded to this outer mold is combined, and an elastic material such as NBR or EPDM is injected and added into a molding space between these molds. By the vulcanization molding, the annular rubber sheet 2 is integrally molded and adhered to the body 1. The rubber sheet 2 molded in this way is accurately molded in the dimensions of the inner diameter and the crushing margin, and has a thickness of 2.5 to 3.0 times the as-cast dimension tolerance in the stem direction and 4. It is molded 0 to 4.5 times. Further, the stem holes 2a, 2a for penetrating the stems 3, 3 have the shaft centers of the shaft holes 1b, 1b of the body 1.
It is molded to match. In addition, this rubber sheet 2
The compound may be molded by selecting an appropriate compounding and vulcanizing condition according to the use condition.
【００１６】また、図４に示すように、ボディ１に成型
された軸孔１ｂの周辺部に、ステム３と同心円の環状凹
部５を設け、この環状凹部５内にも弾性材料を注入、加
硫成型してゴムシート２を延設すると良い。Further, as shown in FIG. 4, an annular recess 5 concentric with the stem 3 is provided in the peripheral portion of the shaft hole 1b formed in the body 1, and an elastic material is injected and added into the annular recess 5. It is advisable to vulcanize and extend the rubber sheet 2.
【００１７】ここで、呼び径１００Ａのバタフライバル
ブを例に説明する。ボディ１の内径寸法公差を１.８m
m、ゴムシート２の厚さ寸法公差を０.０mm、ゴムシート
２の厚さをステム方向で鋳放し寸法公差の２.５〜３.０
倍、ステム垂直方向で鋳放し寸法公差の４.０倍とする
と、ゴムシート２の厚さはステム方向で４.５０±０.４
５mm〜５.４±０.４５mm、ステム垂直方向で７.２０±
０.４５mmとなる。この結果、ゴムシート２の厚さはス
テム方向で±１０.０〜±８.３％、ステム垂直方向で±
６.３％のばらつきとなる。Now, a butterfly valve having a nominal diameter of 100 A will be described as an example. Body 1 inner diameter tolerance is 1.8m
m, the thickness tolerance of the rubber sheet 2 is 0.0 mm, the thickness of the rubber sheet 2 is as cast in the stem direction, and the tolerance is 2.5 to 3.0.
Double, and the vertical dimension of the stem is 4.0, which is the as-cast dimension tolerance, the thickness of the rubber sheet 2 is 4.50 ± 0.4 in the stem direction.
5mm ~ 5.4 ± 0.45mm, 7.20 ± in the vertical direction of the stem
It will be 0.45 mm. As a result, the thickness of the rubber sheet 2 is ± 10.0 to ± 8.3% in the stem direction and ± 10% in the stem vertical direction.
The variation is 6.3%.
【００１８】この場合のボディ１の内径は、図に示すよ
うに、ステム３に垂直なボディ１の中心線を０°とし
て、約±７０°〜±１２０°の軸孔１ｂ，１ｂ周辺部分
が小さく、約±０°〜±７０°、約±１２０°〜±１８
０°の部分が大きく成型され、ゴムシート２の厚さをス
テム方向で４.５０±０.４５mm〜５.４±０.４５mm、ス
テム垂直方向で７.２０±０.４５mmに成型している。な
お、使用条件に適した性能が得られるように、適宜ゴム
シート２のステム方向の厚み及びステム垂直方向の厚み
をステム方向で鋳放し寸法公差の２.５〜３.０倍、ステ
ム垂直方向で４.０〜４.５倍の範囲で選択し、ボディ１
の内径寸法を決定すれば良い。As shown in the drawing, the inner diameter of the body 1 in this case is about ± 70 ° to ± 120 ° around the shaft holes 1b, 1b with the center line of the body 1 perpendicular to the stem 3 being 0 °. Small, about ± 0 ° to ± 70 °, about ± 120 ° to ± 18
The 0 ° portion is largely molded, and the thickness of the rubber sheet 2 is molded to 4.50 ± 0.45 mm to 5.4 ± 0.45 mm in the stem direction and 7.20 ± 0.45 mm in the stem vertical direction. There is. Note that the thickness of the rubber sheet 2 in the stem direction and the thickness in the stem vertical direction are as-cast in the stem direction by 2.5 to 3.0 times the dimensional tolerance, in the stem vertical direction so that performance suitable for the usage conditions can be obtained. Select in the range of 4.0 to 4.5 times with
It is sufficient to determine the inner diameter of the.
【００１９】このように形成されたバタフライバルブ
は、ゴムシート２のステム垂直方向の厚みのばらつきが
±６.３％に抑えられているので、封止性能や作動トル
クが安定する。これに対して、ゴムシート２のステム方
向の厚みのばらつきは、ステム垂直方向の厚みのばらつ
きと比較して±１０.０〜±８.３％と大きくなってい
る。これは、この部分の厚みは、厚くなるほどゴムシー
ト２のステム孔２ａ，２ａを拡げる力が大きくなり流体
漏れの原因となる（図５参照）。しかし、この部分はス
テム３，３から近く、作動トルクに与える影響は小さい
ので、ステム垂直方向の厚みよりも薄く成型し、ステム
３，３周辺部分の封止性能を向上させている。In the butterfly valve thus formed, the variation in thickness of the rubber sheet 2 in the direction perpendicular to the stem is suppressed to ± 6.3%, so that the sealing performance and the operating torque are stable. On the other hand, the variation in the thickness of the rubber sheet 2 in the stem direction is as large as ± 10.0 to ± 8.3% as compared with the variation in the thickness in the stem vertical direction. This is because as the thickness of this portion increases, the force for expanding the stem holes 2a, 2a of the rubber sheet 2 increases, which causes fluid leakage (see FIG. 5). However, since this portion is close to the stems 3 and 3 and has little influence on the operating torque, it is formed thinner than the thickness in the vertical direction of the stems to improve the sealing performance of the peripheral portions of the stems 3 and 3.
【００２０】また、図４に示すように、ステム３，３の
周辺にゴムシート２を延設することにより、ゴムシート
２のステム孔２ａ，２ａの拡がりを防止することがで
き、ステム３，３周辺の封止性能が向上する。Further, as shown in FIG. 4, by extending the rubber sheet 2 around the stems 3, 3, it is possible to prevent the stem holes 2a, 2a of the rubber sheet 2 from expanding, and the stems 3, 3 can be prevented. 3. The sealing performance around 3 is improved.
【００２１】さらに、内周面１ａを加工せず鋳肌のまま
にしてゴムシート２を焼付成型したので、ボディ１とゴ
ムシート２との接着強度が増し、バルブの繰り返し作動
等によるゴムシート２の剥離、変形、移動等を防いで、
作動トルクの増加や流体漏れを防止することができ、且
つ、ボディ１の内周面１ａは加工レスなので工程数が減
りコストを抑えることができる。Furthermore, since the rubber sheet 2 is baked by molding with the inner skin 1a left unprocessed, the adhesive strength between the body 1 and the rubber sheet 2 is increased, and the rubber sheet 2 is repeatedly operated by the valve. Prevents peeling, deformation, and movement of the
It is possible to prevent an increase in operating torque and fluid leakage, and since the inner peripheral surface 1a of the body 1 does not require machining, the number of steps can be reduced and the cost can be suppressed.
【００２２】[0022]
【発明の効果】以上、詳細に説明した本発明は、ボディ
の内径寸法をステム方向では小さく、ステム垂直方向で
は大きく成型して、ゴムシートの厚さをステム方向で鋳
放し寸法公差の２.５〜３.０倍、ステム垂直方向で４.
０〜４.５倍に成型することにより、鋳造したボディの
寸法公差によるゴムシートの厚みのばらつきを抑えて、
一様に安定した性能を有するバタフライバルブを提供す
ることができる。According to the present invention described in detail above, the inner diameter of the body is molded small in the stem direction and large in the vertical direction of the stem, and the thickness of the rubber sheet is as-cast in the stem direction. 5 to 3.0 times, 4.
By molding from 0 to 4.5 times, variation in thickness of rubber sheet due to dimensional tolerance of cast body is suppressed,
It is possible to provide a butterfly valve having uniformly stable performance.
【図１】本発明におけるバタフライバルブの一実施例を
示す概略縦断面図である。FIG. 1 is a schematic vertical sectional view showing an embodiment of a butterfly valve according to the present invention.
【図２】上記バタフライバルブの部分拡大横断面図であ
る。FIG. 2 is a partially enlarged transverse sectional view of the butterfly valve.
【図３】上記バタフライバルブのステム周辺部分の拡大
縦断面図である。FIG. 3 is an enlarged vertical sectional view of a peripheral portion of a stem of the butterfly valve.
【図４】他の実施例におけるバタフライバルブのステム
周辺部分の拡大縦断面図である。FIG. 4 is an enlarged vertical sectional view of a portion around a stem of a butterfly valve in another embodiment.
【図５】ゴムシートを略同じ厚さに焼付成型したバタフ
ライバルブのステム周辺部分の拡大縦断面図である。FIG. 5 is an enlarged vertical cross-sectional view of a stem peripheral portion of a butterfly valve in which a rubber sheet is baked and molded to have substantially the same thickness.
【図６】従来のゴムシートを焼付成型したバタフライバ
ルブを示す概略縦断面図である。FIG. 6 is a schematic vertical sectional view showing a butterfly valve obtained by baking a conventional rubber sheet.
【図７】上記バタフライバルブの部分拡大横断面図であ
る。FIG. 7 is a partially enlarged cross-sectional view of the butterfly valve.
１ ボディ １ａ 内周面 ２ ゴムシート ３ ジスク ４ ステム ５ 環状凹部 1 Body 1a Inner Surface 2 Rubber Sheet 3 Disc 4 Stem 5 Annular Recess
Claims (2)
た略筒状のボディの内径側に、弾性材料からなる略環状
のゴムシートを焼付成型し、前記ボディの直径方向にス
テムを回転自在に装着し、さらに、前記ゴムシート内径
側に円板状のジスクを前記ステムに固定して回転自在に
配設したバタフライバルブにおいて、前記ゴムシートの
厚みが、ステム方向で鋳放し寸法公差の２.５〜３.０
倍、また、ステム垂直方向では４.０〜４.５倍となるよ
うに、ボディの内径寸法を前記ステム方向では小さく、
ステム垂直方向では大きく成型したことを特徴とするバ
タフライバルブ。1. A substantially annular rubber sheet made of an elastic material is bake-molded on the inner diameter side of a substantially cylindrical body whose inner peripheral surface is molded in an as-cast rough state, and a stem is formed in the diameter direction of the body. In a butterfly valve that is rotatably mounted and has a disc-shaped disc fixed to the stem on the inner diameter side of the rubber sheet and is rotatably arranged, the thickness of the rubber sheet is as-cast tolerance in the stem direction. 2.5-3.0
Double, and the inner diameter of the body is small in the stem direction so that it becomes 4.0 to 4.5 times in the stem vertical direction,
A butterfly valve characterized by being molded large in the vertical direction of the stem.
ムと同心円の環状凹部を設け、この環状凹部内に前記ゴ
ムシートを延設させた請求項１記載のバタフライバル
ブ。2. The butterfly valve according to claim 1, wherein an annular recess concentric with the stem is provided in a peripheral portion of the stem on the inner peripheral surface of the body, and the rubber sheet is extended in the annular recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22604695A JP3708177B2 (en) | 1995-08-11 | 1995-08-11 | Butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22604695A JP3708177B2 (en) | 1995-08-11 | 1995-08-11 | Butterfly valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0953729A true JPH0953729A (en) | 1997-02-25 |
| JP3708177B2 JP3708177B2 (en) | 2005-10-19 |
Family
ID=16838944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22604695A Expired - Lifetime JP3708177B2 (en) | 1995-08-11 | 1995-08-11 | Butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3708177B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008025802A (en) * | 2006-07-25 | 2008-02-07 | Kurimoto Ltd | Method of manufacturing butterfly valve and butterfly valve structure |
| CN104972272A (en) * | 2015-05-26 | 2015-10-14 | 扬中市第一蝶阀厂有限公司 | Leakage-proof valve production process |
-
1995
- 1995-08-11 JP JP22604695A patent/JP3708177B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008025802A (en) * | 2006-07-25 | 2008-02-07 | Kurimoto Ltd | Method of manufacturing butterfly valve and butterfly valve structure |
| CN104972272A (en) * | 2015-05-26 | 2015-10-14 | 扬中市第一蝶阀厂有限公司 | Leakage-proof valve production process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3708177B2 (en) | 2005-10-19 |
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