JP4709261B2

JP4709261B2 - Method for forming rubber lining of butterfly valve

Info

Publication number: JP4709261B2
Application number: JP2008271544A
Authority: JP
Inventors: 一司金田; 健次長谷部
Original assignee: Maezawa Industries Inc
Current assignee: Maezawa Industries Inc
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2011-06-22
Anticipated expiration: 2023-10-28
Also published as: JP2009096206A

Description

本発明は、バタフライ弁のゴムライニング形成方法に関し、詳しくは、全体に粉体塗装を施したバタフライ弁の弁箱内周面の所定位置にゴムライニングを施す方法に関する。 The present invention relates to a method for forming a rubber lining of a butterfly valve, and more particularly, to a method of applying a rubber lining to a predetermined position on the inner peripheral surface of a valve box of a butterfly valve that is entirely powder coated.

各種配管系に設けられている弁が劣化したり、損傷したりしたときには、この弁を取り替える必要を生じる。この場合、弁の面間寸法と配管のフランジ間の寸法とが同一寸法では、配管の間に弁を挿入することができないので、弁自体に面間調節機能を備えていない場合は、別途面間調節用の部材を用意しなければならない。 When a valve provided in various piping systems deteriorates or is damaged, it is necessary to replace the valve. In this case, if the valve face-to-face dimension and the pipe flange dimension are the same, the valve cannot be inserted between the pipes. A member for adjusting the interval must be prepared.

このようなことから、弁箱に設けられている配管接続用管体部の一方に継手管（フランジ短管）を軸方向に移動可能に設けた伸縮継手構造を有する面間調節機能付きの弁が提案されている。このような面間調節機能付きの弁を使用することにより、配管途中への弁の取り付けや取り外しを弁のみで行うことができる（例えば、特許文献１参照。）。一方、鋳物製のバタフライ弁では、キャビテーション対策等として弁箱の内周面にゴムライニングを施すことが行われている（例えば、特許文献２参照。）。
実公昭５８−１３１８０号公報特開２００２−３９４００号公報 For this reason, a valve with an inter-surface adjustment function having an expansion joint structure in which a joint pipe (flange short pipe) is provided so as to be movable in the axial direction on one of the pipe connection pipe parts provided in the valve box. Has been proposed. By using such a valve with an inter-surface adjustment function, it is possible to attach or remove the valve in the middle of the piping using only the valve (see, for example, Patent Document 1). On the other hand, in the butterfly valve made of a casting, rubber lining is performed on the inner peripheral surface of the valve box as a countermeasure against cavitation or the like (for example, see Patent Document 2).
Japanese Utility Model Publication No. 58-13180 JP 2002-39400 A

各種構造の弁に対して前述のような面間調節機能を付与する場合、配管接続用管体部を受口として内周にシールリングを装着し、この受口にフランジ短管の差口を挿入して軸方向に移動可能な状態とすることが行われている。しかし、このような面間調節機能を備えたバタフライ弁の弁箱内周面にゴムライニングを施す場合、配管接続用管体部の受口内周にシールリング装着溝を形成しておいても、弁箱内周面にゴムライニングを施す際に、このシールリング装着溝がゴムで埋まってしまうので、シール部材を装着することができなくなる。 When the above-mentioned inter-surface adjustment function is given to valves of various structures, a seal ring is attached to the inner periphery with the pipe connecting pipe part as a receiving port, and a flange short pipe is connected to this receiving port. It has been performed to insert and move in the axial direction. However, when rubber lining is applied to the inner peripheral surface of the valve box of the butterfly valve having such a face-to-surface adjustment function, even if a seal ring mounting groove is formed on the inner periphery of the pipe connecting pipe body portion, When rubber lining is applied to the inner peripheral surface of the valve box, the seal ring mounting groove is filled with rubber, so that the seal member cannot be mounted.

このため、弁箱内周面にゴムライニングを施す際に使用する金型の形状を、前記シールリング装着溝の部分にライニング用のゴムが流れ込まない形状とすることが考えられるが、この場合は、金型外周面と弁箱内周面とが直接接触するようになるため、弁箱内への金型の挿入が困難になったり、金型や弁箱に傷が付いたりするおそれがある。また、一般的に、バタフライ弁には、耐食性を向上させるための手段として、粉体塗装を施すことが行われており、この粉体塗装の塗装面が円滑ではなく、小さな凹凸を有していることから、金型の外面形状を弁箱内周面に合わせて精密に加工しても、ライニング用のゴムがシールリング装着溝の部分に流れ込むことを完全に防止することは困難であり、さらに、金型と粉体塗装面とが接触することにより、塗装面に焼けが発生したり、傷を付けたりして耐食性を損なうおそれもある。 For this reason, it is conceivable that the shape of the mold used when the rubber lining is applied to the inner peripheral surface of the valve box is a shape in which the lining rubber does not flow into the seal ring mounting groove portion. Since the outer peripheral surface of the mold comes into direct contact with the inner peripheral surface of the valve box, it may be difficult to insert the mold into the valve box, or the mold or valve box may be damaged. . Also, in general, a butterfly valve is subjected to powder coating as a means for improving corrosion resistance, and the coated surface of this powder coating is not smooth and has small unevenness. Therefore, even if the outer shape of the mold is precisely matched to the inner peripheral surface of the valve box, it is difficult to completely prevent the lining rubber from flowing into the seal ring mounting groove. Furthermore, the contact between the mold and the powder coating surface may cause the coating surface to be burned or scratched, thereby impairing the corrosion resistance.

そこで本発明は、弁箱内周面や粉体塗装面に傷を付けることなく、弁箱内周面の所定の位置に確実にゴムライニングを施すことができるバタフライ弁のゴムライニング形成方法を提供することを目的としている。 Therefore, the present invention provides a method for forming a rubber lining for a butterfly valve capable of reliably applying a rubber lining to a predetermined position on the inner peripheral surface of the valve box without damaging the inner peripheral surface of the valve box or the powder coating surface. The purpose is to do.

本発明の粉体塗装を施した弁箱内周面の一部にゴムライニングを施すバタフライ弁のゴムライニング形成方法は、弁箱内周面の前記ゴムライニングを施すネック幅に対応する面に、プライマー及び接着剤をこの順に塗布した後、ゴムライニングに必要な未加硫のゴムよりも少ない量の未加硫のゴムを成形して貼り付け、前記弁箱の一端開口から第１の金型の胴部が、他端開口から第２の金型の胴部が、それぞれ弁箱の流路内に挿入された際に、前記金型を構成する金属よりも熱膨張係数が大きく、弁箱内周面に対する摩擦係数が前記金型を構成する金属よりも小さな材料からなるリング状シール材を、前記弁箱の前記ネック幅に対応する面とゴムライニングを施さない面との境界位置にそれぞれ配置されるよう前記第１の金型及び第２の金型の胴部外周にそれぞれ装着し、前記弁箱、前記第１の金型及び第２の金型及び弁箱中央部の弁棒挿通孔に挿入される一対のネック金型の各金型、前記張り付けた未加硫ゴムとは別の未加硫ゴム、該別の未加硫ゴムを圧入するための圧入押金をあらかじめ予熱した状態で、弁箱内の所定位置に各金型を設置して、前記ネック幅に対応する面と第１の金型及び第２の金型の胴部外周面と前記一対のネック金型の外周面と前記リング状シール材とによりゴムライニング形成部を画成するとともに、前記第２の金型と前記圧入押金との間に形成される圧入部に前記ネック幅に対応する面に張り付けた未加硫ゴムとは別の未加硫ゴムをセットした後、前記圧入押金にプレス荷重を加えて前記圧入部にセットされた未加硫ゴムを前記第２の金型の胴部に設けられた圧入孔を通して前記ゴムライニング形成部に押し込み、金型温度を所定温度に上昇させて所定時間保持することにより、前記ネック幅に対応する面に張り付けた未加硫ゴム及び前記ゴムライニング形成部に押し込まれた未加硫ゴムの加硫を行い、加硫終了後所定時間冷却してから前記圧入押金及び各金型を弁箱から抜き取ることにより、前記張り付けた未加硫ゴム及び前記押し込まれた未加硫ゴムを加硫してなるゴムライニングを前記ゴムライニング形成部に施すことを特徴としている。 The rubber lining forming method of the butterfly valve for applying rubber lining to a part of the inner peripheral surface of the valve box subjected to the powder coating of the present invention, the surface corresponding to the neck width of the inner peripheral surface of the valve box to which the rubber lining is applied, After the primer and the adhesive are applied in this order, a smaller amount of unvulcanized rubber than the unvulcanized rubber required for rubber lining is molded and pasted, and the first mold is opened from one end opening of the valve box. When the body part of the second mold is inserted into the flow path of the valve box from the opening at the other end, the coefficient of thermal expansion is larger than that of the metal constituting the mold, and the valve box A ring-shaped sealing material made of a material whose friction coefficient with respect to the inner peripheral surface is smaller than that of the metal constituting the mold is set at the boundary position between the surface corresponding to the neck width of the valve box and the surface not subjected to rubber lining, respectively. The first mold and the second mold to be arranged Respectively attached to the barrel periphery, said valve body, said first mold and the second mold and a pair of neck molds each mold to be inserted into the valve stem insertion hole of the valve body central portion, the pasted In the state where the unvulcanized rubber different from the unvulcanized rubber and the press-fitting press for press-fitting the other unvulcanized rubber are preheated in advance , each mold is installed at a predetermined position in the valve box, A rubber lining forming portion is defined by the surface corresponding to the neck width, the outer peripheral surfaces of the first and second molds, the outer peripheral surfaces of the pair of neck dies, and the ring-shaped sealing material. together, after setting another unvulcanized rubber and unvulcanized rubber stuck to a surface corresponding to the neck width press-fitting portion which is formed between the second die and the press-fitting press metal plate, wherein setting the unvulcanized rubber which is set to the press-in portion by adding pressing force to the pressed press metal plate to the body of the second mold Pushed into the rubber lining forming portion through was press-fit hole by holding a predetermined time at elevated mold temperature to a predetermined temperature, the unvulcanized rubber was stuck to the surface corresponding to the neck width and the rubber lining forming section The unvulcanized rubber pushed in is vulcanized and cooled for a predetermined time after the vulcanization is completed, and then the press-fitted stamp and each die are removed from the valve box, and the pasted unvulcanized rubber and the pushed-in rubber are pushed in. A rubber lining formed by vulcanizing unvulcanized rubber is applied to the rubber lining forming portion .

本発明のバタフライ弁のゴムライニング形成方法によれば、リング状シール材によってゴムライニングを施さない部分、例えば、面間調節機能を備えたバタフライ弁における配管接続用管体部の受口内周に設けたシールリング装着溝に、ライニング用のゴムが流れ込むことを防ぐことができる。特に、前記ゴムライニングを施す面にプライマー及び接着剤を塗布した後に、ゴムライニング形成部に必要な未加硫のゴムよりも少ない量の未加硫のゴムを適当に成形して貼り付けることにより、ゴムライニング形成部へのゴム圧入量を少なくすることができ、圧入押金のストローク縮小や圧入孔の削減、成形時間の短縮等が図れるといった利点がある。 According to the method for forming a rubber lining of a butterfly valve of the present invention, a portion that is not subjected to rubber lining by a ring-shaped sealing material, for example, a pipe connecting pipe body in a butterfly valve having a face-to-face adjusting function It is possible to prevent the lining rubber from flowing into the seal ring mounting groove. In particular, after applying a primer and an adhesive to the surface to be subjected to rubber lining, an amount of unvulcanized rubber smaller than the amount of unvulcanized rubber required for the rubber lining forming part is appropriately molded and pasted. The amount of rubber press-fitting into the rubber lining forming part can be reduced, and there are advantages that the stroke of the press-fitting stamper, press-fitting holes can be reduced, and the molding time can be shortened.

図１及び図２は、本発明のバタフライ弁のゴムライニング形成方法に使用されるゴムライニング用金型の一形態例を示すものである。本形態例は、バタフライ弁の弁箱内周面にネック幅のゴムライニングを施すためのゴムライニング用金型であって、図１はゴムライニング形成前の状態を示す弁箱及び金型の断面図、図２はゴムライニング形成時の状態を示す弁箱及び金型の断面図である。図３及び図４は、ネック幅のゴムライニングを施した面間調節機能付きバタフライ弁の一例を示すもので、図３は一部断面平面図、図４は要部の断面図である。 1 and 2 show one embodiment of a rubber lining mold used in the method for forming a rubber lining of a butterfly valve according to the present invention. This embodiment is a rubber lining mold for applying a neck width rubber lining to the inner circumferential surface of a valve box of a butterfly valve, and FIG. 1 is a sectional view of the valve box and the mold showing a state before the rubber lining is formed. FIG. 2 is a cross-sectional view of the valve box and the mold showing the state when the rubber lining is formed. 3 and 4 show an example of a butterfly valve with a face-to-face adjustment function with a rubber lining of the neck width, FIG. 3 is a partially sectional plan view, and FIG. 4 is a sectional view of the main part.

まず、図３及び図４に示すように、面間調節機能付きのバタフライ弁１１は、流路を開閉する弁体１２を収納した弁箱１３の一方の配管接続用管体部に面間調節機能を付加したものであって、図３において左側に示した配管接続用管体部１４は、先端外周にフランジ１５を設けて通常のフランジ接合を行うように形成しており、図３において右側に示した配管接続用管体部１６には、シールリング装着溝１７に装着したシールリング１８を介してフランジ短管１９を軸方向に移動可能に挿入し、バタフライ弁１１の面間寸法を調節可能としている。 First, as shown in FIGS. 3 and 4, the butterfly valve 11 with the inter-surface adjustment function adjusts the inter-surface adjustment to one pipe connecting pipe body portion of the valve box 13 that houses the valve body 12 that opens and closes the flow path. The pipe connecting tube portion 14 shown on the left side in FIG. 3 is provided with a flange 15 on the outer periphery of the tip so as to perform normal flange joining. A flange short pipe 19 is inserted into the pipe connection pipe body portion 16 shown in Fig. 6 through a seal ring 18 fitted in the seal ring fitting groove 17 so as to be movable in the axial direction, and the dimension between the faces of the butterfly valve 11 is adjusted. It is possible.

前記フランジ短管１９は、配管接続用管体部１６内に挿入される差口２１と配管接続用のフランジ２２とを有するものであって、フランジ２２と弁箱１３との間には、弁箱１３に対してフランジ短管１９を軸方向に移動させるためのフランジ短管移動手段２３と、弁箱１３にフランジ短管１９及び配管２４を固定するためのフランジ短管固定手段２５が設けられ、フランジ短管１９と配管２４との間には、両者をフランジ結合するためのフランジ結合手段２６が設けられている。 The flange short pipe 19 has a differential port 21 inserted into the pipe connection pipe body portion 16 and a pipe connection flange 22. Between the flange 22 and the valve box 13, a valve A flange short pipe moving means 23 for moving the flange short pipe 19 in the axial direction with respect to the box 13 and a flange short pipe fixing means 25 for fixing the flange short pipe 19 and the pipe 24 to the valve box 13 are provided. Between the flange short pipe 19 and the pipe 24, a flange coupling means 26 is provided for flange coupling of both.

フランジ短管移動手段２３は、配管接続用管体部１６の外周面から突出した複数の弁箱側ボルト挿通部１３ａと、フランジ短管１９のフランジ外周から突出した複数の短管側ボルト挿通部１９ａと、弁箱側ボルト挿通部１３ａ及び短管側ボルト挿通部１９ａを貫通するように設けられたボルト（ねじ棒）２３ａと、弁箱側ボルト挿通部１９ａ及び短管側ボルト挿通部１９ａの両面でボルト２３ａにそれぞれ螺合した４個のナット２３ｂとで形成されている。 The flange short pipe moving means 23 includes a plurality of valve box side bolt insertion portions 13 a protruding from the outer peripheral surface of the pipe connecting pipe body portion 16 and a plurality of short pipe side bolt insertion portions protruding from the flange outer periphery of the flange short tube 19. 19a, a bolt (screw rod) 23a provided so as to penetrate the valve box side bolt insertion part 13a and the short pipe side bolt insertion part 19a, and a valve box side bolt insertion part 19a and a short pipe side bolt insertion part 19a. It is formed of four nuts 23b screwed to the bolts 23a on both sides.

フランジ短管固定手段２５は、弁箱側ボルト挿通部１３ａ及び短管側ボルト挿通部１９ａから配管２４のフランジ２４ａを貫通するボルト２５ａと、弁箱側ボルト挿通部１３ａの両面及び短管側ボルト挿通部１９ａとフランジ２４ａの突き合わせ部外面とにそれぞれ螺合した４個のナット２５ｂとで形成されている。 The flange short pipe fixing means 25 includes a bolt 25a that penetrates the flange 24a of the pipe 24 from the valve box side bolt insertion part 13a and the short pipe side bolt insertion part 19a, both surfaces of the valve box side bolt insertion part 13a, and a short pipe side bolt. It is formed by four nuts 25b screwed to the insertion part 19a and the outer surface of the abutting part of the flange 24a.

フランジ結合手段２６は、通常のフランジ結合と同様に、短管側ボルト挿通部１９ａとフランジ２４ａとを貫通するボルト２６ａと、該ボルト２６ａのネジ部に螺合するナット２６ｂとで形成されている。 The flange coupling means 26 is formed by a bolt 26a that penetrates the short tube side bolt insertion portion 19a and the flange 24a, and a nut 26b that is screwed into a threaded portion of the bolt 26a, as in the normal flange coupling. .

面間調節機能付きバタフライ弁１１を配管途中に挿入する際には、フランジ短管移動手段２３のナット２３ｂを操作して面間を縮めた状態で配管途中にバタフライ弁１１を挿入した後、面間調節機能を持たない配管接続用管体部１４のフランジ１５を一方の配管（図示せず）にフランジ結合により仮締めする。 When inserting the butterfly valve 11 with the inter-surface adjusting function in the middle of the piping, the nut 23b of the flange short pipe moving means 23 is operated to insert the butterfly valve 11 in the middle of the piping in a state where the space is reduced. The flange 15 of the pipe connecting pipe body portion 14 having no interval adjusting function is temporarily fastened to one pipe (not shown) by flange connection.

次に、再びフランジ短管移動手段２３のナット２３ｂを操作して面間を伸ばし、フランジ短管１９のフランジ２２を配管２４のフランジ２４ａに押し当て、フランジ結合手段２６のボルト２６ａ、ナット２６ｂを取り付けてフランジ短管１９と他方の配管２４とを仮締めする。さらに、この状態で、フランジ短管固定手段２５のナット２５ｂを操作し、弁箱１３側を除いてフランジ短管１９と配管２４とを仮締めする。 Next, the nut 23b of the flange short pipe moving means 23 is operated again to extend the surface, the flange 22 of the flange short pipe 19 is pressed against the flange 24a of the pipe 24, and the bolt 26a and nut 26b of the flange connecting means 26 are pressed. Attach and temporarily tighten the short flange pipe 19 and the other pipe 24. Further, in this state, the nut 25b of the short flange fixing means 25 is operated, and the short flange 19 and the pipe 24 are temporarily tightened except for the valve box 13 side.

このようにして仮締め作業を終えた後、フランジ１５と一方の配管とをフランジ結合するボルト・ナットを本締めし、続いて、フランジ結合手段２６のボルト２６ａ、ナット２６ｂも本締めする。次に、フランジ短管固定手段２５のナット２５ｂを操作してフランジ短管１９と配管２４とを本締めした後、弁箱側ボルト挿通部１３ａの配管２４側のナット２５ｂを軽く締め付けるとともに、反配管２４側のナット２５ｂを本締めする。最後に、フランジ短管移動手段２３のナット２３ｂを締め付ける。 After completing the temporary tightening operation in this way, the bolts and nuts that flange-connect the flange 15 and the one pipe are finally tightened, and subsequently, the bolts 26a and nuts 26b of the flange connecting means 26 are also finally tightened. Next, after operating the nut 25b of the flange short pipe fixing means 25 to finally tighten the flange short pipe 19 and the pipe 24, the nut 25b on the pipe 24 side of the valve box side bolt insertion portion 13a is lightly tightened and Fully tighten the nut 25b on the pipe 24 side. Finally, the nut 23b of the flange short pipe moving means 23 is tightened.

これにより、面間調節機能付きバタフライ弁１１を配管途中に挿入・装着することができ、フランジ短管固定手段２５とフランジ結合手段２６とによって弁箱１３、フランジ短管１９及び配管２４を確実に固定した状態とすることができる。 As a result, the butterfly valve 11 with the inter-surface adjustment function can be inserted and mounted in the middle of the piping, and the valve box 13, the flange short tube 19 and the pipe 24 can be securely connected by the flange short tube fixing means 25 and the flange coupling means 26. It can be in a fixed state.

この面間調節機能付きバタフライ弁１１は、全体に粉体塗装を施して耐食性を向上させるとともに、弁箱１３の中央部にネック幅のゴムライニング３１を施して小開度時のキャビテーション対策としている。このネック幅のゴムライニング３１は、図１及び図２に示すゴムライニング用金型３２を用いて形成されている。 The butterfly valve 11 with a face-to-face adjustment function is coated with powder to improve corrosion resistance, and a neck-line rubber lining 31 is provided at the center of the valve box 13 to prevent cavitation at a small opening. . This neck width rubber lining 31 is formed by using a rubber lining mold 32 shown in FIGS.

ゴムライニング用金型３２は、弁箱１３の両端開口からそれぞれ弁箱内に挿入される第１の金型である下金型３３及び第２の金型である上金型３４と、弁箱中央部の弁棒挿通孔１３ｂに挿入される一対のネック金型３５と、未加硫の成形ゴムを圧入するための圧入押金３６とで構成されている。下金型３３は、弁箱１３の配管接続用管体部１６より大径の基板部３７と、配管接続用管体部１６からネック金型３５の先まで弁箱内に挿入される胴部３８と、胴部上面中心から突出した嵌合凸部３９と、胴部３８の外周に装着されたリング状シール材４０とを有している。 The rubber lining mold 32 includes a lower mold 33 that is a first mold and an upper mold 34 that is a second mold, which are inserted into the valve box from both ends of the valve box 13, and a valve box. It is composed of a pair of neck molds 35 inserted into the central valve rod insertion hole 13b and a press-fitting presser 36 for press-fitting unvulcanized molded rubber. The lower die 33 includes a substrate portion 37 having a diameter larger than that of the pipe connection pipe body portion 16 of the valve box 13 and a body portion inserted into the valve box from the pipe connection pipe body portion 16 to the tip of the neck die 35. 38, a fitting convex portion 39 protruding from the center of the upper surface of the trunk portion, and a ring-shaped sealing material 40 attached to the outer periphery of the trunk portion 38.

また、上金型３４は、配管接続用管体部１４よりも大径の基板部４１と、配管接続用管体部１４から下金型３３の上面に密着するように挿入される胴部４２と、胴部４２の先端外周部に装着されたリング状シール材４３とを有するものであって、胴部４２の先端には嵌合凸部３９が嵌入する貫通口４４が設けられ、該貫通口４４を貫通した嵌合凸部３９の外周面と胴部４２の内周面との間に、前記圧入押金３６が圧入される圧入部４５が設けられている。さらに、圧入部４５と胴部先端外周との間には、内外に貫通した圧入孔４６が設けられている。 Further, the upper mold 34 has a substrate part 41 having a diameter larger than that of the pipe connecting pipe part 14, and a body part 42 inserted so as to be in close contact with the upper surface of the lower mold 33 from the pipe connecting pipe part 14. And a ring-shaped sealing material 43 attached to the outer peripheral portion of the front end of the body portion 42, and a through-hole 44 into which the fitting convex portion 39 is fitted is provided at the front end of the body portion 42. A press-fit portion 45 into which the press-fitting presser 36 is press-fitted is provided between the outer peripheral surface of the fitting convex portion 39 penetrating the opening 44 and the inner peripheral surface of the body portion 42. Further, a press-fit hole 46 penetrating inward and outward is provided between the press-fit portion 45 and the outer periphery of the front end of the body portion.

ネック金型３５は、弁棒挿通孔１３ｂの内周面に当接する丸棒状のものであって、先端は、下金型３３の胴部３８に嵌入するようになっている。さらに、下金型３３及び上金型３４の内部には、金型加熱用蒸気を導入するための蒸気室４７及び蒸気通路４８がそれぞれ設けられている。 The neck mold 35 is in the shape of a round bar that comes into contact with the inner peripheral surface of the valve rod insertion hole 13 b, and the tip is fitted into the body portion 38 of the lower mold 33. Furthermore, a steam chamber 47 and a steam passage 48 for introducing mold heating steam are provided inside the lower mold 33 and the upper mold 34, respectively.

前記上下の金型３３，３４の胴部３８，４２の外径は、弁箱１３の内周に施された塗装面の内径よりも小さく形成されており、弁箱内に胴部３８，４２を挿入する際に、胴部３８，４２の外面が塗装面に接触しないようにしている。また、各胴部３８，４２の外周面所定位置には、ゴムライニングを形成するためのゴムライニング形成部４９がそれぞれ設けられている。 The outer diameters of the body portions 38, 42 of the upper and lower molds 33, 34 are formed smaller than the inner diameter of the painted surface provided on the inner periphery of the valve box 13, and the body portions 38, 42 are formed in the valve box. Is inserted so that the outer surfaces of the body portions 38 and 42 do not contact the painted surface. In addition, rubber lining forming portions 49 for forming rubber linings are provided at predetermined positions on the outer peripheral surfaces of the body portions 38 and 42, respectively.

前記リング状シール材４０，４３は、弁箱内周面のゴムライニングを施す面と施さない面との境界位置、すなわち、両リング状シール材４０，４３の距離がネック幅に対応するように、前記ゴムライニング形成部４９の両側に相当する位置にそれぞれ設けられるものであって、各金型を構成する金属よりも熱膨張係数が大きく、かつ、弁箱内周面に対する摩擦係数が小さな材料で形成されている。また、リング状シール材４０，４３の外径は、弁箱１３の内径（塗装面の内径）と同一か、それよりも小さく、さらに、弁箱１３内に各胴部３８，４２を挿入する際に、胴部３８，４２が塗装面に接触して傷付けないように、リング状シール材４０，４３の外周面が胴部３８，４２の外周面より僅かに大径になるように形成されており、ゴムライニングを施す際の昇温による熱膨張で弁箱内周面（塗装面）に確実に密着するように設定されている。 The ring-shaped sealing materials 40 and 43 are arranged such that the boundary position between the rubber lining surface and the non-surfaced surface on the inner peripheral surface of the valve box, that is, the distance between the ring-shaped sealing materials 40 and 43 corresponds to the neck width. The material is provided at positions corresponding to both sides of the rubber lining forming portion 49, and has a coefficient of thermal expansion greater than that of the metal constituting each mold and a coefficient of friction with respect to the inner peripheral surface of the valve box. It is formed with. Further, the outer diameters of the ring-shaped sealing materials 40 and 43 are the same as or smaller than the inner diameter of the valve box 13 (the inner diameter of the painted surface), and the body portions 38 and 42 are inserted into the valve box 13. At this time, the outer peripheral surfaces of the ring-shaped sealing materials 40 and 43 are formed to be slightly larger in diameter than the outer peripheral surfaces of the barrel portions 38 and 42 so that the barrel portions 38 and 42 do not come into contact with the painted surface and are damaged. It is set so as to be in close contact with the inner peripheral surface (painted surface) of the valve box by thermal expansion due to the temperature rise when the rubber lining is applied.

このリング状シール材４０，４３の熱膨張係数が金型を構成する金属よりも小さいと、ゴムライニングを施す際の昇温によって金型の方が大きく膨張し、胴部３８，４２の外面が弁箱内周の塗装面に接触して塗装面に焼けを発生させるおそれがあり、リング状シール材４０，４３が塗装面に十分に密着しなくなることがある。 If the coefficient of thermal expansion of the ring-shaped sealing materials 40 and 43 is smaller than that of the metal constituting the mold, the mold expands more greatly due to the temperature rise when the rubber lining is applied, and the outer surfaces of the body portions 38 and 42 are expanded. There is a possibility that the coating surface on the inner circumference of the valve box may come into contact with the coating surface, and the ring-shaped sealing materials 40 and 43 may not be sufficiently adhered to the coating surface.

なお、摩擦係数が小さな部分は、リング状シール材４０，４３の全体であってもよく、外周面部分のみであってもよい。さらに、リング状シール材４０，４３は、ゴムライニングを施す際の高温状態に耐えられる耐熱性を備えていることはいうまでもない。また、各金型へのリング状シール材４０，４３の装着は、一般的なシール材と同様に、金型外周に設けた装着溝にリング状シール材４０，４３をはめ込むことによって行うことができる。 In addition, the part with a small friction coefficient may be the whole ring-shaped sealing materials 40 and 43, and may be only an outer peripheral surface part. Furthermore, it goes without saying that the ring-shaped sealing materials 40 and 43 have heat resistance capable of withstanding a high temperature state when rubber lining is applied. Further, the ring-shaped sealing materials 40 and 43 are attached to the respective molds by fitting the ring-shaped sealing materials 40 and 43 into the mounting grooves provided on the outer periphery of the mold, as in the case of general sealing materials. it can.

このようなリング状シール材４０，４３を形成する材料は、任意に選択することができるが、特に、フッ素樹脂、中でも、テトラフロロエチレン樹脂が最適である。フッ素樹脂は、金型材料として一般に用いられているＳＳ４００鋼材に比べて熱膨張係数が大きく、摩擦係数が小さく、耐熱性も十分であるという利点を有している。なお、一般に弁箱に使用するＦＣＤ４５０と、金型に使用するＳＳ４００と、リング状シール材に使用するフッ素樹脂（テトラフロロエチレン樹脂）とにおける熱膨張係数を参考として下記に示す。 A material for forming such ring-shaped sealing materials 40 and 43 can be arbitrarily selected, and in particular, a fluororesin, particularly, a tetrafluoroethylene resin is optimal. The fluororesin has the advantage that it has a larger coefficient of thermal expansion, a smaller coefficient of friction, and sufficient heat resistance than SS400 steel generally used as a mold material. In general, the thermal expansion coefficients of FCD450 used for a valve box, SS400 used for a mold, and a fluororesin (tetrafluoroethylene resin) used for a ring-shaped sealing material are shown below for reference.

ＦＣＤ４５０：１０×１０^−６／℃
ＳＳ４００：１０．７×１０^−６／℃
フッ素樹脂：１００×１０^−６／℃ FCD450: 10 × 10 ⁻⁶ / ° C.
SS400: 10.7 × 10 ⁻⁶ / ° C.
Fluorine resin: 100 × 10 ⁻⁶ / ° C.

このように形成したゴムライニング用金型を用いてネック幅のゴムライニング３１を形成するには、まず、耐食性を向上させるために全体に粉体塗装を施した弁箱１３のゴムライニング面に、プライマー及び接着剤をこの順に塗布する。次に、弁箱１３のゴムライニング３１を施す位置に、必要量よりも少ない量の未加硫のゴムを適当に成形して貼り付ける。このように、所定位置、例えば、圧入孔４６から離れた位置等に未加硫ゴムをあらかじめ適当量貼り付けておくことにより、圧入部４５からのゴム圧入量を少なくすることができ、圧入押金３６のストローク縮小や圧入孔４６の削減、成形時間の短縮等が図れるといった利点がある。 In order to form the neck width rubber lining 31 using the rubber lining mold formed as described above, first, the rubber lining surface of the valve box 13 which is powder-coated on the entire surface in order to improve the corrosion resistance, Primer and adhesive are applied in this order. Next, an unvulcanized rubber in an amount smaller than the required amount is appropriately molded and pasted at a position where the rubber lining 31 of the valve box 13 is applied. In this way, by adhering an appropriate amount of unvulcanized rubber to a predetermined position, for example, a position away from the press-fitting hole 46, the amount of rubber press-fitted from the press-fitting portion 45 can be reduced. There are advantages that the stroke can be reduced by 36, the press-fit holes 46 can be reduced, the molding time can be shortened, and the like.

まず、弁箱，各金型及び未加硫ゴムをあらかじめ予熱した状態で、所定位置に設置されている下金型３３に、前述のようにして未加硫ゴムを貼り付けておいた弁箱１３をセットし、弁箱１３内に胴部３８を挿入した状態とする。続いて、弁箱１３の上方から上金型３４の胴部４２を弁箱内に挿入し、両金型の上下端面を密着させる。さらに、ネック金型３５を弁棒挿通孔１３ｂにセットして各金型と弁箱１３との位置決めを行う。 First, the valve box, the respective molds and the unvulcanized rubber are preheated in advance, and the unvulcanized rubber is pasted on the lower mold 33 installed at a predetermined position as described above. 13 is set, and the body 38 is inserted into the valve box 13. Subsequently, the body portion 42 of the upper mold 34 is inserted into the valve box 13 from above the valve box 13, and the upper and lower end surfaces of both molds are brought into close contact with each other. Further, the neck mold 35 is set in the valve rod insertion hole 13b to position the molds and the valve box 13 with each other.

この状態で、圧入部４５にあらかじめ予熱した未加硫ゴム５０をセットした後、図１に示すように、圧入押金３６を圧入部４５に圧入し、所定圧力で所定時間、プレス荷重を加えて未加硫ゴム５０を圧入孔４６を通してゴムライニング形成部４９に向けて押し込む。
このとき、金型温度の上昇でリング状シール材４０，４３も昇温し、適度に熱膨張して粉体塗装面に密着した状態になるので、図２に示すように、未加硫ゴムがリング状シール材４０，４３の間のゴムライニング形成部４９内に圧入された状態となり、リング状シール材４０，４３と粉体塗装面との間から未加硫ゴムが外部に漏れ出すことはない。 In this state, after pre-heated unvulcanized rubber 50 is set in the press-fitting part 45, as shown in FIG. 1, a press-fitting pusher 36 is press-fitted into the press-fitting part 45, and a press load is applied at a predetermined pressure for a predetermined time. The unvulcanized rubber 50 is pushed through the press-fit hole 46 toward the rubber lining forming portion 49.
At this time, as the mold temperature rises, the ring-shaped sealing materials 40 and 43 also rise in temperature and are appropriately thermally expanded to be in close contact with the powder coating surface. Therefore, as shown in FIG. Is pressed into the rubber lining forming portion 49 between the ring-shaped sealing materials 40 and 43, and unvulcanized rubber leaks to the outside from between the ring-shaped sealing materials 40 and 43 and the powder coating surface. There is no.

未加硫ゴムを圧入後、蒸気通路４８を通して蒸気室４７，４７に高温蒸気を供給し、金型温度を所定温度に上昇させて所定時間保持することにより、ゴムの加硫を行う。加硫終了後は、蒸気室４７に冷却水を供給し、所定時間冷却してから各金型を弁箱１３から抜き取ることにより、図３，図４に示すように、弁箱１３の中央部にネック幅のゴムライニング３１を施したバタフライ弁１１が得られる。 After the unvulcanized rubber is injected, high temperature steam is supplied to the steam chambers 47, 47 through the steam passage 48, and the mold temperature is raised to a predetermined temperature and held for a predetermined time to vulcanize the rubber. After the vulcanization is completed, cooling water is supplied to the steam chamber 47 and cooled for a predetermined time, and then each mold is removed from the valve box 13, so that the central part of the valve box 13 is shown in FIGS. 3 and 4. A butterfly valve 11 having a neck-wide rubber lining 31 is obtained.

図５及び図６は、バタフライ弁のゴムライニング形成方法に使用されるゴムライニング用金型の参考例を示すもので、図５はバタフライ弁にゴムライニングを形成する前の状態を示す弁箱及び金型の断面図、図６はゴムライニング形成時の状態を示す弁箱及び金型の断面図である。 5 and 6 show a reference example of a rubber lining mold used in a method for forming a rubber lining of a butterfly valve. FIG. 5 shows a valve box showing a state before the rubber lining is formed on the butterfly valve. FIG. 6 is a sectional view of the valve box and the mold showing a state when the rubber lining is formed.

本参考例に示すゴムライニング用金型は、シールリング装着溝１７を設けた配管接続用管体部１６の内周面を除く弁箱内周面にゴムライニング５１を施すために用いられるものであって、下金型５２、上金型５３及びネック金型５４とで構成されており、基本的には、前記形態例に示したゴムライニング用金型と略同様に形成されている。 The rubber lining mold shown in this reference example is used to apply a rubber lining 51 to the inner peripheral surface of the valve box excluding the inner peripheral surface of the pipe connecting pipe body portion 16 provided with the seal ring mounting groove 17. there, the lower mold 52, is constituted by the upper mold 53 and the neck mold 54, basically, being substantially similarly formed as rubber lining mold shown before Symbol form Tairei .

すなわち、下金型５２は、基板部５５と、ネック金型５４の先まで弁箱内に挿入される胴部５６と、胴部上面中心から突出した嵌合凸部５７と、胴部５６の外周に装着されたリング状シール材５８と、金型内に設けられた蒸気室５９とを有している。上金型５３は、基板部６０と、下金型５２の胴部上面に密着するように挿入される胴部６１と、金型内に設けられた蒸気室６２とを有しており、胴部６１の先端には嵌合凸部５７が嵌入する貫通口６３が設けられている。さらに、下金型５２の胴部５６の先端部（ネック部）及び上金型５３の胴部６１は、ゴムライニング５１を形成するために弁箱内径よりも小径に形成されており、弁箱内周面との間に所定幅の隙間（ゴムライニング形成部）が設けられている。 That is, the lower mold 52 includes a base plate part 55, a body part 56 inserted into the valve box up to the end of the neck mold 54, a fitting convex part 57 protruding from the center of the upper surface of the body part, and a body part 56. It has the ring-shaped sealing material 58 with which the outer periphery was mounted | worn, and the steam chamber 59 provided in the metal mold | die. The upper mold 53 includes a substrate part 60, a body part 61 inserted so as to be in close contact with the upper surface of the body part of the lower mold 52, and a steam chamber 62 provided in the mold. A through-hole 63 into which the fitting convex portion 57 is fitted is provided at the tip of the portion 61. Further, the front end portion (neck portion) of the body portion 56 of the lower mold 52 and the body portion 61 of the upper mold 53 are formed to have a smaller diameter than the inner diameter of the valve box in order to form the rubber lining 51. A gap (rubber lining forming portion) having a predetermined width is provided between the inner peripheral surface and the inner peripheral surface.

本参考例に示すゴムライニング用金型を用いて弁箱内周面にゴムライニング５１を形成するには、前記同様に、全体に粉体塗装を施した弁箱１３のゴムライニング面に、プライマー及び接着剤を塗布した後、弁箱、金型及び未加硫ゴムを予熱した状態で、嵌合凸部５７の外周に未加硫ゴム５０をセットした下金型５２を所定位置に置き、弁箱１３を上方から下ろして弁箱内に胴部５６を挿入し、下金型５２に弁箱１３をセットする。続いて上金型５３の胴部６１を上方から弁箱内に挿入するとともに、ネック金型５４を弁棒挿通孔１３ｂにセットして金型と弁箱との位置決めを行う。 In order to form the rubber lining 51 on the inner peripheral surface of the valve box using the rubber lining mold shown in this reference example, a primer is applied to the rubber lining surface of the valve box 13 which is powder-coated on the whole as described above. And after applying the adhesive, with the valve box, the mold and the unvulcanized rubber preheated, the lower mold 52 in which the unvulcanized rubber 50 is set on the outer periphery of the fitting convex portion 57 is placed at a predetermined position, The valve box 13 is lowered from above, the body 56 is inserted into the valve box, and the valve box 13 is set in the lower mold 52. Subsequently, the body 61 of the upper mold 53 is inserted into the valve box from above, and the neck mold 54 is set in the valve rod insertion hole 13b to position the mold and the valve box.

次に、上金型５３にプレス荷重を加え、上金型５３を下金型５２に向けて所定圧力で所定時間押し込み、図６に示すように、未加硫ゴムを弁箱と金型との間のゴムライニング形成部に向けて圧入する。このとき、前述のようなリング状シール材５８の作用により、配管接続用管体部１６への未加硫ゴムの漏れが防止される。 Next, a press load is applied to the upper mold 53, and the upper mold 53 is pushed toward the lower mold 52 with a predetermined pressure for a predetermined time. As shown in FIG. Press-fit toward the rubber lining forming part. At this time, leakage of unvulcanized rubber to the pipe connecting pipe body portion 16 is prevented by the action of the ring-shaped sealing material 58 as described above.

未加硫ゴムを圧入後、蒸気室５９，６２に高温蒸気を供給して金型温度を所定温度に上昇させ、所定時間保持することによってゴムを加硫する。その後、蒸気室５９，６２に冷却水を供給して所定時間冷却してから各金型を弁箱１３から抜き取ることにより、シールリング装着溝１７を設けた配管接続用管体部１６の内周面を除く弁箱内周面にゴムライニング５１を施したバタフライ弁が得られる。 After press-fitting unvulcanized rubber, high temperature steam is supplied to the steam chambers 59 and 62 to raise the mold temperature to a predetermined temperature and hold the rubber for a predetermined time to vulcanize the rubber. Thereafter, cooling water is supplied to the steam chambers 59 and 62 and cooled for a predetermined time, and then the respective molds are extracted from the valve box 13, whereby the inner periphery of the pipe connecting pipe body portion 16 provided with the seal ring mounting groove 17. A butterfly valve having a rubber lining 51 on the inner peripheral surface of the valve box excluding the surface is obtained.

なお、上記形態例及び参考例では、面間調節機能付きのバタフライ弁の弁箱内周にゴムライニングを施す例を説明したが、本発明の金型は、通常の両フランジ型バタフライ弁の弁箱内周にゴムライニングを施す場合にも適用可能である。 In the upper Symbol form Tairei and reference examples, an example has been described for performing rubber lining in the circumferential inside the valve body surface between adjusting function of the butterfly valve, the mold of the present invention, conventional flanges type butterfly valve It can also be applied to the case where rubber lining is applied to the inner periphery of the valve box.

本発明のバタフライ弁のゴムライニング形成方法は、面間調節機能付きのバタフライ弁の弁箱内周にゴムライニングを施す際に好適である。 The method for forming a rubber lining for a butterfly valve according to the present invention is suitable when rubber lining is applied to the inner periphery of a valve box of a butterfly valve having a face-to-face adjustment function.

本発明のバタフライ弁のゴムライニング形成方法に使用されるゴムライニング用金型の一形態例を示すもので、バタフライ弁にゴムライニングを形成する前の状態を示す弁箱及び金型の断面図である。 1 shows an example of a rubber lining mold used in the method for forming a rubber lining of a butterfly valve according to the present invention, and is a sectional view of the valve box and the mold showing a state before the rubber lining is formed on the butterfly valve. is there. 同じくゴムライニング形成時の状態を示す弁箱及び金型の断面図である。It is sectional drawing of the valve box and metal mold | die which similarly show the state at the time of rubber lining formation. 面間調節機能付きバタフライ弁の一例を示す一部断面平面図である。It is a partial cross section top view which shows an example of the butterfly valve with a surface adjustment function. 同じく要部の断面図である。It is a sectional view of the principal part similarly. バタフライ弁のゴムライニング形成方法に使用されるゴムライニング用金型の参考例を示すもので、バタフライ弁にゴムライニングを形成する前の状態を示す弁箱及び金型の断面図である。The reference example of the rubber lining mold used in the rubber lining forming method of the butterfly valve is shown, and is a sectional view of the valve box and the mold showing a state before the rubber lining is formed on the butterfly valve. 同じくゴムライニング形成時の状態を示す弁箱及び金型の断面図である。It is sectional drawing of the valve box and metal mold | die which similarly show the state at the time of rubber lining formation.

Explanation of symbols

１１…バタフライ弁、１２…弁体、１３…弁箱、１３ａ…弁棒挿通孔、１４…配管接続用管体部、１５…フランジ、１６…配管接続用管体部、１７…シールリング装着溝、１８…シールリング、１９…フランジ短管、２１…差口、２２…フランジ、２３…フランジ短管移動手段、２４…配管、２５…フランジ短管固定手段、２６…フランジ結合手段、３１…ゴムライニング、３２…ゴムライニング用金型、３３…下金型、３４…上金型、３５…ネック金型、３６…圧入押金、３７…基板部、３８…胴部、３９…嵌合凸部、４０…リング状シール材、４１…基板部、４２…胴部、４３…リング状シール材、４４…貫通口、４５…圧入部、４６…圧入孔、４７…蒸気室、４８…蒸気通路、４９…ゴムライニング形成部、５０…未加硫ゴム、５１…ゴムライニング、５２…下金型、５３…上金型、５４…ネック金型、５５…基板部、５６…胴部、５７…嵌合凸部、５８…リング状シール材、５９…蒸気室、６０…基板部、６１…胴部、６２…蒸気室、６３…貫通口 DESCRIPTION OF SYMBOLS 11 ... Butterfly valve, 12 ... Valve body, 13 ... Valve box, 13a ... Valve-rod insertion hole, 14 ... Pipe connection pipe part, 15 ... Flange, 16 ... Pipe connection pipe part, 17 ... Seal ring installation groove 18 ... Seal ring, 19 ... Flange short pipe, 21 ... Fitting, 22 ... Flange, 23 ... Flange short pipe moving means, 24 ... Pipe, 25 ... Flange short pipe fixing means, 26 ... Flange coupling means, 31 ... Rubber Lining, 32 ... mold for rubber lining, 33 ... lower mold, 34 ... upper mold, 35 ... neck mold, 36 ... press-fitting press, 37 ... substrate part, 38 ... trunk part, 39 ... fitting convex part, DESCRIPTION OF SYMBOLS 40 ... Ring-shaped sealing material, 41 ... Board | substrate part, 42 ... trunk | drum, 43 ... Ring-shaped sealing material, 44 ... Through-hole, 45 ... Press-in part, 46 ... Press-in hole, 47 ... Steam chamber, 48 ... Steam passage, 49 ... Rubber lining forming part, 50 ... Unvulcanized rubber, 51 ... Mulining, 52 ... Lower mold, 53 ... Upper mold, 54 ... Neck mold, 55 ... Substrate, 56 ... Body, 57 ... Fitting projection, 58 ... Ring-shaped sealing material, 59 ... Steam chamber, 60 ... Substrate part, 61 ... Body part, 62 ... Steam chamber, 63 ... Through-hole

Claims

In a method for forming a rubber lining of a butterfly valve in which a part of the inner peripheral surface of the valve box that has been powder-coated is rubber-lined, a primer and an adhesive are bonded to the surface corresponding to the neck width of the inner surface of the valve box that is subjected to the rubber lining. After the agents are applied in this order, a smaller amount of unvulcanized rubber than the unvulcanized rubber required for the rubber lining is molded and pasted, and the barrel of the first mold is opened from one end opening of the valve box. However, when the body portion of the second mold is inserted into the flow path of the valve box from the other end opening, the coefficient of thermal expansion is larger than that of the metal constituting the mold, and the inner peripheral surface of the valve box A ring-shaped sealing material made of a material having a smaller coefficient of friction with respect to the metal constituting the mold is disposed at a boundary position between a surface corresponding to the neck width of the valve box and a surface not subjected to rubber lining. Of the first mold and the second mold Respectively mounted on the section periphery, said valve body, said first mold and the second mold and the valve body central portion of the valve stem insertion hole pair of neck molds each mold to be inserted into, said pasted In a state where the unvulcanized rubber different from the unvulcanized rubber and the press-fitting press for press-fitting the other unvulcanized rubber are preheated in advance , each mold is installed at a predetermined position in the valve box, A rubber lining forming portion is defined by the surface corresponding to the neck width, the outer peripheral surfaces of the first mold and the second mold, the outer peripheral surfaces of the pair of neck molds, and the ring-shaped sealing material. The unvulcanized rubber different from the unvulcanized rubber attached to the surface corresponding to the neck width is set in the press-fitting portion formed between the second die and the press-fitting press, and then the press-fitting press metal plate to provide a unvulcanized rubber which is set to the press-in portion by adding pressing force to the body of the second mold Pushed into the rubber lining forming section through the press-fit hole by holding a predetermined time at elevated mold temperature to a predetermined temperature, the unvulcanized rubber was stuck to the surface corresponding to the neck width and the rubber lining forming section The unvulcanized rubber pushed in is vulcanized, cooled for a predetermined time after the vulcanization is completed, and then the press-fitted stamp and each die are removed from the valve box, so that the pasted unvulcanized rubber and the pushed-in rubber are pushed in. A rubber lining forming method for a butterfly valve, characterized in that a rubber lining formed by vulcanizing unvulcanized rubber is applied to the rubber lining forming portion .