JP4017099B2

JP4017099B2 - Pipe fitting

Info

Publication number: JP4017099B2
Application number: JP2001301487A
Authority: JP
Inventors: 隆司矢野; 敏章内田
Original assignee: Waterworks Technology Development Organization Co Ltd
Current assignee: Waterworks Technology Development Organization Co Ltd
Priority date: 2001-09-28
Filing date: 2001-09-28
Publication date: 2007-12-05
Anticipated expiration: 2021-09-28
Also published as: JP2003106484A

Description

【０００１】
【発明の属する技術分野】
本発明は管継手に関する。
【０００２】
【従来の技術】
図１３に、水道管などに用いる金属製あるいは樹脂製の従来のこの種管継手の構造例を示す。この管継手は、軸上に対向する金属あるいは樹脂製の接合管６１の端部間を、矢印のように伸縮と可撓機能を持たせて液漏れのないように継ぐものである。
【０００３】
すなわち、継手本体６２と一対の左右の押輪６３とを備え、これらを緊締具６４（ボルト）で締め付けるようにしてある。継手本体６２は一対のフランジ状の突出部６２ａを備え、これら突出部６２ａ間に筒胴部６２ｂを一体に備えて構成されると共に、突出部６２ａの内周には端部方向にテーパー状に拡がる受口部６２ｃを有する。
【０００４】
押輪６３もフランジ状の突出部６３ａを備え、接合管６１間の外周に継手本体６２が周隙間を残して位置するようにし、その両端に押輪６３を配置して緊締具６４で締め付けるように構成されている。
【０００５】
そして、緊締具６４の締め付けにより、継手本体６２と各押輪６３との間にセットしたゴムパッキン輪６５が、押輪６３の先端部で押されて受口部６２ｃに結合すると共に、接合管６１の外周面に圧着して接合管６１が継がれた状態となる。
【０００６】
上記従来の管継手の場合、必要部品を分解した状態で現場に運搬して組み立てながら施工するのであるが、従来の他の管継手の中には、現場での作業性を一層高める等のため、予め仮組みするものもある。
【０００７】
即ち、図１４に示す環状のスペーサ６６を用い、図１５（ａ）に示すように、スペーサ６６の係止凸部６６ａにゴムパッキン輪６７の係止凹部６７ａを嵌め込んで組み付けておいて、ゴムパッキン輪６７の先部を継手本体６８の受口部６８ｃに入れると共に、スペーサ６６の位置決め用突起６６ｂがちょうど受口部６８ｃの開口縁の角に当て嵌まるまで、押輪６９を緊締具（図示省略）を締め付けて仮組みを行う。仮組み状態の管継手では、スペーサ６６の位置決め用突起６６ｂによりゴムパッキン輪６７が、径方向に位置決め（調芯）されるのに加え、軸方向にも位置決めされることになる。
【０００８】
このようにして仮組みされた管継手は、そのまま現場に運搬された後、図１５（ｂ）に示すように、接合管６１が内挿されると共に、緊締具（図示省略）をさらに締め付けて、スペーサの位置決め用突起６６ｂを折り巻き込みながら、図１５（ｃ）に示すように、ゴムパッキン輪６７を受口部６８ｃに楔状に結合すると共に、接合管６１の外周面に圧着すれば、現場での作業は速やかに完了する。
【０００９】
【発明が解決しようとする課題】
しかしながら、上記従来技術のスペーサ付き管継手の場合、ゴムパッキン輪６５，６７の径方向および軸方向の位置決めが簡単とは言えないのに加え、スペーサ６６の位置決め用突起６６ｂが運搬中に破損などして管継手の仮組み状態が崩れてしまうことがあるという問題がある。
【００１０】
図１３に示すゴムパッキン輪６５の場合、径方向および軸方向の位置決めの目安とするようなものがなく、ゴムパッキン輪６５をしっかり位置決めするのは簡単でない。また、図１５のゴムパッキン輪６７の場合、スペーサ６６の係止凸部６６ａにゴムパッキン輪６７の係止凹部６７ａを嵌め込んで組み付けた後、さらにスペーサ６６の位置決め用突起６６ｂが受口部６８ｃの開口縁の角にちょうど当て嵌まるように押輪６９を緊締具（図示省略）で締め付けるのは、結構手間がかかる作業であり、決して簡単ではない。
【００１１】
しかも、仮組み状態が崩れて、ゴムパッキン輪６７の径方向および軸方向の位置決めが損なわれると、押輪６９が落ち込んでゴムパッキン輪６７に当たってゴムパッキン輪６７が傷ついたり、接合管６１が内挿されていない状態でゴムパッキン輪６７が受口部６８ｃの奥まで移動してゴムパッキン輪６７の径が大きく縮んだりして、ゴムパッキン輪６７が不良品になったりする。そうなると、不良品のゴムパッキン輪６７やスペーサ６６を一旦外して、良品のゴムパッキン輪６７やスペーサ６６を改めて取り付けなければならず、現場での作業は面倒なものになってしまう。
【００１２】
本発明は上記実情に鑑みてなされたもので、その目的は、パッキン輪の径方向および軸方向の位置決めが簡単に行えると共に、仮組み状態が崩れ難い管継手を提供することにある。
【００１３】
【課題を解決するための手段】
本発明の第１の特徴構成は、接合管の外周に周隙間をもって嵌装する継手本体の軸芯方向の端部に、前記接合管に対する継ぎ手手段を設けるとともに、前記継手本体の軸芯方向中間部に、前記継手本体内の流路を開閉する仕切り弁を設け、前記継ぎ手手段は、外周に第１突出部を有し接合管の一端側外周に嵌め込まれる押輪を設け、前記継手本体の端部の押輪に対向する側に、前記第１突出部に対向する第２突出部を形成し、前記第２突出部の内周側に前記押輪に向けて拡がる受口部を形成し、前記押輪を継手本体の方向に移動操作可能な緊締具を設け、前記継手本体と接合管との内外間に設けられ前記緊締具の操作により移動する前記押輪による直接押圧に伴って生じる自らの弾性変形により前記受口部に嵌装されるパッキン輪を設けて構成し、
前記パッキン輪が受口部側となる先部と押輪側となる基部とから成り、前記先部は外周が前記受口部の入口に仮止め可能に前記受口部の内径とほぼ同径とされていると共に、前記基部は前記先部に繋がる処だけ外周が前記先部の外径よりも大径とされて前記受口部周縁外面に当接するストッパーと成るよう形成し、
前記仕切り弁は、前記流路の全閉位置と全開位置とにわたって弁棒の軸心方向に移動可能な弁体にゴムライニングを施し、ゴムライニングによって弁体に形成する弁体シートを、前記継手本体に形成する継手本体シートに押圧して前記継手本体と弁体の間をシールするよう構成するとともに、前記弁体の上流面及び下流面に、それぞれ独立してシール性を発揮する弁体シートを形成してある点にある。
【００１４】
上記の構成により、
パッキン輪の基部のストッパーが継手本体の受口部周縁外面に当接するようにしてパッキン輪の先部が受口部の入口に仮止めされていると共に、緊締具の操作により移動する押輪がパッキン輪の基部の押輪側端面に当接した状態とすることにより仮組みがなされる。
【００１５】
仮組みされた管継手に接合管を内挿した状態で緊締具の操作によって押輪を移動させると、押輪の移動による直接押圧に伴ってパッキン輪がストッパーを含めて自ら弾性変形しながら受口部の奥へ進入して受口部に楔状に密着結合すると共に、接合管の外周面にも圧着することにより、パッキン輪が嵌装されて接合管が継がれる。
【００１６】
この管継手の場合、パッキン輪の基部のストッパーを継手本体の受口部周縁外面に当接するようにしてパッキン輪の先部を受口部の入口に仮止めするだけで、パッキン輪をスペーサに組付ける作業も必要とせず、受口部の入口に仮止めされた先部でパッキン輪の径方向の位置決めがされ、継手本体の受口部周縁外面に当接するストッパーでパッキン輪の軸芯方向の位置決めがされるので、パッキン輪の径方向および軸芯方向の位置決めは簡単であるのに加え、スペーサを全く用いないので、スペーサの破損による仮組み崩壊も全くなく、管継手の仮組み状態は崩れ難いものとなる。
【００１７】
上記した構成において、弁体は弁棒の軸芯方向に移動して開閉動作する。弁体の全閉状態において、弁棒の操作力が弁体に作用し、弁体シートと継手本体シートのシール面が相互に圧接してシール性を発揮する。このとき、弁体の上流面および下流面に設けた弁体シートが、それぞれ独立してシール性を発揮するので、二重のシール構造を具現することができ、シール性能が向上する。
【００１８】
前記仕切り弁は継手本体に設けてあるから、仕切り弁と継手本体とを別体に形成してある構造に比べると、仕切り弁と継手本体との連結が不要で施工を簡素化することができるとともに、部品点数を少なくすることができて構造を簡素化でき、施工コスト・製作コストを低廉化することができる。
【００１９】
ところで、一般に仕切弁としては、例えば図１６〜図１８に示すようなものがある。図１６〜図１８において、弁箱１０１の内部には弁棒１０２の下端に接続して弁体１０３を配設しており、弁棒１０２は弁体１０３の上部に配置した雌ネジコマ１０４に螺合している。弁体１０３は、弁棒１０２の回転駆動により、弁箱１０１の上部に形成した収納部１０５と、弁箱１０１の内部に形成した弁箱シート部１０６に対応する位置とにわたって昇降する。
【００２０】
弁体１０３は全面にゴムライニングを施したものであり、その弁体シート部１０７は、上流側および下流側に対向する上部の両側部に形成した上部シート部１０７ａと、弁中心の下部の外周面に形成した下部シート部１０７ｂからなり、対向する２つの上部シート部１０７ａと弁中心の１つの下部シート部１０７ｂは、その端部において連続するシール面を形成している。
【００２１】
弁箱シート部１０６は、上部シート部１０７ａと下部シート部１０７ｂに対向する部位に、エポキシ樹脂の粉体塗装によってシール面を形成している。
【００２２】
上記した構成において、全閉時には弁体シート部１０７を弁箱シート部１０６に弁棒１０２の軸心方向において押圧し、双方のシール面が圧着することにより、シール性を確保している。このために、弁体１０３は、雌ネジコマ１０４を介して弁棒１０２による押圧力を受け止める部位１０３ａを、その変形を防止するために厚肉構造としている。
【００２３】
また、十分なシール性能を確保するためには、弁体シート部１０７のシール面と弁箱シート部１０６のシール面が十分な面積をもって圧接することが必要である。このため、弁体シート部１０７の上部シート部１０７ａは、所定幅のシール面を形成することを目的として、弁体１０３の上流側面および下流側面から弁体１０３の厚み方向に突出している。
【００２４】
弁体１０３において弁棒１０２による押圧力を受け止める部位１０３ａを厚肉構造とするために、その肉厚を大きくするほどに、雌ネジコマ１０４を配置する位置は高くなる。また、弁体１０３において弁棒１０２による押圧力を受け止める部位１０３ａを厚肉構造とすることは、弁体１０３の高さ寸法が大きくなり、収納部１０５が大きくなるので、仕切弁の全高が大きくなる。しかし、近年においては経済的理由により仕切弁のコンパクト化が求められており、仕切弁の全高を小さくすることが求められている。
【００２５】
このため、上部シート部１０７ａより下方の位置に雌ネジコマ１０４を配置することが考えられるが、この場合に、上部シート部１０７ａが弁体１０３の上流側面および下流側面から弁体１０３の厚み方向に突出することが所定幅のシール面を形成するために必須であるために、弁体１０３の厚み方向の寸法が雌ネジコマ１０４および上部シート部１０７ａの寸法を加算したものとなり、仕切弁の全長が大きくなる問題がある。
【００２６】
これに対して請求項２のように、各弁体シートを、弁体上部の縁部に形成する上部弁体シートと、弁体下部の周縁部に形成する下部弁体シートとで構成し、継手本体シートを、上部弁体シートに当接する上部継手本体シートと、下部弁体シートに当接する下部継手本体シートとで構成し、上流側の上部弁体シートと下流側の上部弁体シートを弁体下部に向けて下り勾配の傾斜面に形成し、上部弁体シートに当接する上部継手本体シートを継手本体下部に向けて下り勾配の傾斜面に形成し、双方の上部弁体シート間に弁棒の雄ネジ部に螺合する雌ネジコマを設けてある構造に構成すると、次の作用効果を奏することができる。
【００２７】
つまり、上部弁体シートと上部継手本体シートが楔状に嵌合することにより、シール面の幅を十分に確保しても弁体の厚み方向における上部弁体シートの寸法を小さくすることができるので、双方の上部弁体シートの間に雌ネジコマを配置しても、全体としての弁体の厚み方向の寸法を従来と変わらぬ大きさに抑制することができる。しかも、雌ネジコマが上部弁体シートの間に位置することで、弁体の高さ寸法を小さくすることができ、仕切弁としての全高を抑制して小型化を図ることができる。
【００２８】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００２９】
図１，図２，図３に示す管継手は、金属製または樹脂製の接合管１を水密に継ぐものであり、接合管１の外周に周隙間をもって嵌装する継手本体２の軸芯方向の端部に、接合管１に対する継ぎ手手段Ａを設けるとともに、継手本体２の軸芯方向中間部に、継手本体２内の流路を開閉する仕切り弁Ｂを設けてある。次に前記継ぎ手手段Ａの構造について説明する。
【００３０】
［継ぎ手手段Ａの構造］
図４，図５，図６にも示すように、継手本体２と一対の押輪３とを設け、これらをＴ形ボルト・ナットである緊締具４で締め付けるようにしてある。継手本体２は複数のフランジ状の第２突出部２ａを備え、これら第２突出部２ａ間に筒胴部２ｂを一体に備えて構成されると共に、第２突出部２ａの内周には受口部２ｃを有する。
【００３１】
押輪３もフランジ状の第１突出部３ａを備えており、接合管１間の外周に継手本体２が周隙間を残して位置するようにし、その両端に押輪３を配置すると共に、継手本体２と各押輪３との間にゴム製パッキン輪５をセットし、緊締具４で締め付けるように構成されている。
【００３２】
そして、図７，図８，図９に示すように、緊締具４の締め付けにより、ゴム製パッキン輪５が押輪３の先端部３ｂで押されて受口部２ｃに楔状に結合すると共に、接合管１の外周面に圧着していて、接合管１を通過する液体が外部に漏れ出ないように、接合管１が継がれた状態となっている。この管継手の各部の構成を具体的に説明する。
【００３３】
継手本体２の外周に一体形成されている各突出部２ａには、ボルト通孔が設けられている。また、継手本体２の両端に押輪３側に向けて拡がるように形成された受口部２ｃでは、例えば図７に示すように、窄まる側に接合管１に平行な筒面である圧入部２ｄが形成され、拡がる側に接合管１に平行な筒面である受孔部２ｅが形成されている。
【００３４】
押輪３の外周に一体形成されている各第１突出部３ａにも、ボルト通孔が設けられており、押輪３と継手本体２のボルト通孔を介してＴ型ボルト・ナットからなる緊締具４が挿通され、締め付け得るようになっている。
【００３５】
また、押輪３の側には、その内周に抜け止めリング６が設けられている。押輪３は、周方向の１個所で分離しており、止着具７で締め付け可能な構造になっている。
【００３６】
さらに、一例としてＳＢＲ（スチレンブタジエンゴム）等からなるゴム製パッキン輪５は、継手本体２と接合管１との内外間に設けられ緊締具４の操作により、移動する押輪３の先端部３ｂによる直接押圧に伴って生じる自らの弾性変形によって、受口部２ｃに嵌装されるものである。
【００３７】
図５, 図６に示すようにゴム製パッキン輪５は、受口部２ｃ側となる先部５ａと押輪３側となる基部５ｂとからなり、図７に示すように、先部５ａは外周が受口部２ｃの入口である受孔部２ｅに仮止めが可能なように、受口部２ｃの内径とほぼ同径とされている一方、基部５ｂは先部５ａに繋がる処だけ外周が先部５ａの外径よりも大径とされて、受口部周縁外面２ｆに当接するストッパー５ｃとなっている。
【００３８】
本実施形態の場合、パッキン輪５の内周が、その自然状態で接合管１の外周よりも大径になっており、予め組み立てられた継手本体２とパッキン輪５と押輪３との組み合わせを施工現場などに搬送して施工する際、これらの組み合わせに接合管１を取り付ける作業が簡単に行うことができるうえに、パッキン輪５が過度の抵抗なくして受口部２ｃに圧入される。
【００３９】
また、パッキン輪５の先部５ａはシール性に優れた軟質部で、基部５ｂは硬質部となっており、押輪３による押圧がパッキン輪５に確実に伝達されるのに加え、パッキン輪５の先部５ａが密着性・圧着性に優れるので、シール性能がよい。
【００４０】
前記先部５ａとしての軟質部は硬度Ｈ_A が６０°±５°程度のものが、基部５ｂとしての硬質部は硬度Ｈ_A が９０°±５°のものが適当である。また、パッキン輪５の先部５ａは、横断面において丸形になっており、受孔部２ｅの縁角も丸くなっていて、先部５ａが受孔部２ｅに挿入し易くなっている。
【００４１】
パッキン輪５の基部５ｂでは、例えば図７に示すように、押輪側外周端縁の全周にわたって押輪側に突出する外周側ヒレ部５ｅが形成されていると共に外周側ヒレ部５ｅの内周が押輪３の先端部の外径と略同径とされている。
【００４２】
その結果、パッキン輪５の基部５ｂの押輪３側端面に当たる押輪３は、先端部３ｂが外周側ヒレ部５ｅの内側にきっちり嵌め込まれるようになり、押輪３とパッキン輪５の径方向の位置決めが自動的に行われることになる。
【００４３】
一方、ストッパー５ｃの基部５ｂの受口部２ｃに接当する側に凹み５ｆが付けられており、受口部２ｃの開口である受孔部２ｅの縁に引っ掛かると共に進行方向とは反対側に反るようにして弾性変形しつつ、ストッパーはスムーズに受口部２ｃに進入できる。
【００４４】
前記基部５ｂの一部であるストッパー５ｃは、硬度Ｈ_A が９０°±５°で、適度な硬さ・弾性変形性を有するので、十分なストッパー機能を発揮して仮組み状態が非常に崩れ難いうえに、パッキン輪５を受口部２ｃに進入させる際にストッパー５ｃが容易に変形する。
【００４５】
本実施形態の管継手の場合、仮組み状態では、図７に示すように、ゴム製パッキン輪５の基部５ｂのストッパー５ｃが継手本体２の受口部周縁外面２ｆに当接するようにして、パッキン輪５の先部５ａが受口部２ｃの入口である受孔部２ｅに仮止めされていると共に、緊締具４の操作により移動する押輪３の先端部３ｂが、パッキン輪５の基部５ｂの外周側５ｅときっちり嵌合するようになり、押輪３側端面に当接した状態とされる。
【００４６】
仮組みされた管継手では、パッキン輪５の基部５ｂのストッパー５ｃを継手本体２の受口部周縁外面２ｆに当接するようにしてパッキン輪５の先部５ａを受口部２ｃの入口である受孔部２ｅに仮止めするだけで、パッキン輪５をスペーサに組付ける作業も必要とせず、受孔部２ｅに挿入された先部５ａでパッキン輪５の径方向の位置決めがされる。
【００４７】
その結果、継手本体２の受口部周縁外面２ｆに当接するストッパー５ｃでパッキン輪５の軸方向の位置決めがされるので、パッキン輪５の径方向および軸方向の位置決めは非常に簡単であるうえに、スペーサを全く用いないので、スペーサの破損による仮組み崩壊が全くなく、管継手を仮組み状態のまま現場へ運搬する場合にも、管継手の仮組み状態は崩れ難くなる。
【００４８】
現場に運搬された後、仮組された管継手に接合管１を内挿した状態で、緊締具４の操作により押輪３を移動させると、図８に示すように、押輪３の移動による直接押圧に伴ってパッキン輪５がストッパー５ｃを含めて自ら弾性変形しながら受口部２ｃを奥に進入し始める。
【００４９】
その後、図９に示すように、押輪３が継手本体２の第１突出部２ａに突き当たると共に、パッキン輪５が受口部２ｃの圧入部２ｄに楔状に密着結合し、接合管１の外周面にも圧着することにより、パッキン輪５は嵌装され、接合管１を通過する液体が外部に漏れ出ないように接合管１が継がれる。
【００５０】
ストッパー５ｃは、先部側がスムーズに受口部２ｃの中に進入し、軟質部である柔らかな先部５ａが圧入部２ｄや接合管１の外周面に十分に密着・圧着するので、シール性能は良好である。
【００５１】
上記の管継手は仮組される必要はなく、各部品が分解された状態で現場に運搬されて施工されてもよい。
【００５２】
次に、仕切り弁Ｂの構造について説明する。
【００５３】
［仕切り弁Ｂの構造］
図４，図１０，図１１，図１２において、仕切り弁Ｂ（ソフトシール弁である）は、継手本体２の内部に継手本体内流路１３を横切る方向に出退する弁体１４を配置しており、弁体１４は継手本体内流路１３と弁体収納空間１５との間で出退自在に設けている。弁体収納空間１５は継手本体２の弁体収納部１６と蓋部１７とで形成しており、蓋部１７の頂部にパッキン箱１８を設けている。
【００５４】
弁棒１９は、雄ネジ部１９ａが弁体１４に装着した雌ネジコマ２０に螺合し、頭部１９ｂにキャップ２１を装着している。弁体１４は、弁棒１９の雄ネジ部１９ａを収納する貫通穴１４ａを有した中空状の基板部１４ｂの全面にゴムライニング２２を施してあり、弁体１４の縁部のゴムライニング２２によって弁体シート２３を形成している。
【００５５】
弁体シート２３は、弁体上部の上流面および下流面の縁部に形成する上部弁体シート２３ａと、弁体下部の上流面および下流面の周縁部に形成する下部弁体シート２３ｂとからなり、上部弁体シート２３ａと下部弁体シート２３ｂは双方の端部において連続している。継手本体２は、その内部に上部弁体シート２３ａに当接する上部継手本体シート２４ａと、下部弁体シート２３ｂに当接する下部継手本体シート２４ｂからなる継手本体シート２４を設けている。
【００５６】
上流側および下流側の上部弁体シート２３ａは、弁体下部に向けて下り勾配の傾斜面をなしており、この構造により弁体１４は上部に楔構造を形成している。弁体１４は双方の上部弁体シート２３ａの間において雌ネジコマ２０を保持している。以下、上記した構成における作用を説明する。弁体１４の開閉操作は、キャップ２１および弁棒１９を回転駆動して行う。弁棒１９の回転により雌ネジコマ２０および弁体１４は弁棒１９の軸心方向に移動し、弁体シート２３が継手本体シート２４に当接して継手本体２の内部の流路を全閉する位置と、弁体収納部１６に待避して継手本体２の内部の流路を全開する位置とにわたって出退する。
【００５７】
弁体１４の全閉状態において、弁体１４はゴムライニング２２を介して継手本体２の内面に当接し、ゴムライニング２２の上部弁体シート２３ａおよび下部弁体シート２３ｂがそれぞれ上部継手本体シート２４ａおよび下部継手本体シート２４ｂに圧接し、継手本体内面に対する接触面を十分な幅をもって形成し、そのシール性を発揮する。
【００５８】
この弁体１４の全閉操作時において、弁棒１９の操作力が雌ネジコマ２０を介して弁体１４に作用する。このとき、弁体１４は上部弁体シート２３ａが上部継手本体シート２４ａと楔状に嵌合するので、上部弁体シート２３ａと上部継手本体シート２４ａのシール面間に十分な面圧が発生する。
【００５９】
〔別実施の形態〕
前記緊締具４はネジ式以外のものであってもよい。
【図面の簡単な説明】
【図１】管継手の正面図
【図２】管継手の平面図
【図３】管継手の側面図
【図４】管継手の縦断正面図
【図５】パッキン輪を示す正面図
【図６】図５におけるＡ−Ａ線断面図
【図７】管継手の仮組み状態を示す縦断面図
【図８】管継手の施工前半の状態を示す縦断面図
【図９】管継手の施工後半の状態を示す部分断面図
【図１０】弁体の正面図
【図１１】弁体の平面図
【図１２】弁体の縦断面図
【図１３】従来の管継ぎ手の施工状態を示す図
【図１４】従来の管継手のスペーサを示す断面図
【図１５】従来の管継手のスペーサの施工を示す断面図
【図１６】従来の仕切り弁の一部切欠き正面図
【図１７】従来の仕切り弁の弁体の正面図
【図１８】従来の仕切り弁の弁体の断面図
【符号の説明】
１接合管
２継手本体
２ａ第２突出部
２ｃ受口部
２ｆ受口部周縁外面
３押輪
３ａ第１突出部
３ｂ先端部
４緊締具
５，５Ａパッキン輪
５ａ先部
５ｂ基部
５ｃストッパー
１４弁体
１９弁棒
１９ａ雄ネジ部
２０雌ネジコマ
２３弁体シート
２３ａ上部弁体シート
２３ｂ下部弁体シート
２４継手本体シート
２４ａ上部継手本体シート
２４ｂ下部継手本体シート
Ａ継ぎ手手段
Ｂ仕切り弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint.
[0002]
[Prior art]
FIG. 13 shows a structural example of this conventional pipe joint made of metal or resin used for a water pipe or the like. This pipe joint connects the ends of metal or resin-made joining pipes 61 facing on the shafts so as to have expansion and contraction and a flexible function as indicated by arrows so that there is no liquid leakage.
[0003]
That is, a joint main body 62 and a pair of left and right push wheels 63 are provided, and these are fastened with a fastening tool 64 (bolt). The joint body 62 includes a pair of flange-shaped projecting portions 62a, and is configured by integrally including a cylindrical body portion 62b between the projecting portions 62a. The inner periphery of the projecting portion 62a is tapered in the end direction. It has the receiving part 62c which expands.
[0004]
The pusher ring 63 also includes a flange-like protrusion 63a, and the joint body 62 is positioned on the outer periphery between the joining pipes 61 leaving a circumferential gap, and the pusher ring 63 is disposed at both ends thereof and is tightened with the fastening tool 64. Has been.
[0005]
The rubber packing ring 65 set between the joint main body 62 and each pusher ring 63 is pushed by the tip end part of the pusher ring 63 and coupled to the receiving part 62c by tightening the tightening tool 64. It will be in the state where the joining pipe 61 was joined by crimping | bonding to an outer peripheral surface.
[0006]
In the case of the above-mentioned conventional pipe joint, it is constructed while transporting and assembling to the site in the state where the necessary parts are disassembled. Some are temporarily assembled in advance.
[0007]
That is, using the annular spacer 66 shown in FIG. 14, as shown in FIG. 15A, the engagement recess 67 a of the rubber packing ring 67 is fitted and assembled to the engagement projection 66 a of the spacer 66. The tip of the rubber packing ring 67 is inserted into the receiving portion 68c of the joint main body 68, and the pusher ring 69 is tightened until the positioning projection 66b of the spacer 66 is just fitted to the corner of the opening edge of the receiving portion 68c (illustrated). Tighten (Omitted) and perform temporary assembly. In the temporarily assembled pipe joint, the rubber packing ring 67 is positioned not only in the radial direction (alignment) by the positioning projection 66b of the spacer 66 but also in the axial direction.
[0008]
After the pipe joint temporarily assembled in this way is transported to the site as it is, as shown in FIG. 15B, the joining pipe 61 is inserted, and the tightening tool (not shown) is further tightened, As shown in FIG. 15C, while the spacer positioning projection 66b is folded, the rubber packing ring 67 is coupled to the receiving portion 68c in a wedge shape and is crimped to the outer peripheral surface of the joining pipe 61. This work will be completed promptly.
[0009]
[Problems to be solved by the invention]
However, in the case of the above-described conventional pipe joint with a spacer, it is not easy to position the rubber packing rings 65 and 67 in the radial direction and the axial direction, and the positioning projection 66b of the spacer 66 is damaged during transportation. And there exists a problem that the temporary assembly state of a pipe joint may collapse.
[0010]
In the case of the rubber packing ring 65 shown in FIG. 13, there is no guideline for positioning in the radial direction and the axial direction, and it is not easy to position the rubber packing ring 65 firmly. Further, in the case of the rubber packing ring 67 of FIG. 15, after the fitting recess 66a of the rubber packing ring 67 is fitted into the locking projection 66a of the spacer 66 and assembled, the positioning projection 66b of the spacer 66 further receives the receiving portion. Tightening the presser wheel 69 with a tightening tool (not shown) so that it fits exactly at the corner of the opening edge of 68c is a time-consuming work and is not easy.
[0011]
In addition, if the temporarily assembled state collapses and the radial and axial positioning of the rubber packing ring 67 is impaired, the pusher wheel 69 falls and hits the rubber packing ring 67 to damage the rubber packing ring 67, or the joining pipe 61 is inserted. The rubber packing ring 67 moves to the back of the receiving portion 68c in a state where it is not, and the diameter of the rubber packing ring 67 is greatly reduced, so that the rubber packing ring 67 becomes a defective product. In this case, the defective rubber packing ring 67 and the spacer 66 must be removed once, and the good rubber packing ring 67 and the spacer 66 must be attached again, which makes the work on the site troublesome.
[0012]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe joint in which the packing ring can be easily positioned in the radial direction and the axial direction and the temporarily assembled state is not easily broken.
[0013]
[Means for Solving the Problems]
According to a first characteristic configuration of the present invention, a joint means for the joint pipe is provided at an end portion in the axial direction of the joint body that is fitted to the outer periphery of the joint pipe with a circumferential gap, and an intermediate portion in the axial direction of the joint body is provided. A gate valve that opens and closes the flow path in the joint body, and the joint means is provided with a push ring that has a first protrusion on the outer periphery and is fitted to the outer periphery on one end side of the joint pipe, A second projecting portion facing the first projecting portion is formed on a side of the second projecting portion facing the press ring, and a receiving portion extending toward the press wheel is formed on an inner peripheral side of the second projecting portion, and the press wheel A fastening tool that can be moved in the direction of the joint body, and is provided between the joint body and the joint tube, and is elastically deformed by direct pressing by the push ring that moves by operating the fastening tool. A packing ring fitted to the receiving part is provided. And,
The packing ring is composed of a front part on the side of the receiving part and a base part on the side of the push ring, and the front part has an outer periphery substantially the same diameter as the inner diameter of the receiving part so that it can be temporarily fixed to the inlet of the receiving part. In addition, the base is formed so that the outer periphery is larger than the outer diameter of the front portion and serves as a stopper that contacts the outer peripheral surface of the receiving portion, as long as it is connected to the front portion.
The gate valve is configured to apply a rubber lining to a valve body movable in the axial direction of the valve stem over a fully closed position and a fully open position of the flow path, and to form a valve body sheet formed on the valve body by the rubber lining, A valve body sheet that is configured to seal between the joint body and the valve body by pressing against a joint body sheet formed on the body, and that independently exhibits sealing performance on the upstream surface and the downstream surface of the valve body. It is in the point that is formed.
[0014]
With the above configuration,
The front end of the packing ring is temporarily fixed to the inlet of the receiving part so that the stopper at the base of the packing ring is in contact with the outer peripheral surface of the receiving part of the joint body. Temporary assembly is performed by bringing the base portion of the wheel into contact with the end surface on the push wheel side.
[0015]
When the press ring is moved by operating the tightening tool with the joint pipe inserted in the temporarily assembled pipe joint, the packing ring elastically deforms itself including the stopper along with the direct pressing by the movement of the press ring, and the receiving part The seal ring is fitted and joined to the outer peripheral surface of the joint tube by being wedge-tightly joined to the receiving port and entering into the inner part of the joint portion, so that the joint ring is fitted and the joint tube is continued.
[0016]
In the case of this pipe joint, the packing ring can be used as a spacer only by temporarily fixing the tip of the packing ring to the inlet of the receiving part with the stopper at the base of the packing ring coming into contact with the outer peripheral surface of the receiving part of the fitting body. Assembling work is not required, the packing ring is positioned in the radial direction at the tip part temporarily fixed at the inlet of the receiving part, and the stopper is in contact with the outer peripheral surface of the receiving part of the joint body. In addition to simple positioning of the packing ring in the radial direction and axial center direction, the spacer is not used at all. Is difficult to collapse.
[0017]
In the configuration described above, the valve element moves in the axial direction of the valve stem and opens and closes. In the fully closed state of the valve body, the operating force of the valve rod acts on the valve body, and the sealing surfaces of the valve body sheet and the joint body sheet are brought into pressure contact with each other to exhibit sealing performance. At this time, since the valve body sheets provided on the upstream surface and the downstream surface of the valve body independently exhibit the sealing performance, a double seal structure can be realized, and the sealing performance is improved.
[0018]
Since the gate valve is provided in the joint body, the gate valve and the joint body are not required to be connected and the construction can be simplified compared to a structure in which the gate valve and the joint body are formed separately. In addition, the number of parts can be reduced, the structure can be simplified, and the construction cost and production cost can be reduced.
[0019]
By the way, generally as a gate valve, there exists a thing as shown, for example in FIGS. 16 to 18, a valve body 103 is connected to the lower end of the valve stem 102 inside the valve box 101, and the valve stem 102 is screwed onto a female screw piece 104 disposed on the upper portion of the valve body 103. Match. The valve body 103 is moved up and down over a storage portion 105 formed in the upper portion of the valve box 101 and a position corresponding to the valve box seat portion 106 formed in the valve box 101 by the rotational drive of the valve rod 102.
[0020]
The valve body 103 has a rubber lining on the entire surface, and the valve body seat portion 107 includes an upper seat portion 107a formed on both sides of the upper portion facing the upstream side and the downstream side, and an outer periphery of the lower portion of the valve center. The lower sheet part 107b formed on the surface, the two upper sheet parts 107a facing each other and the one lower sheet part 107b at the center of the valve form a continuous sealing surface at the end.
[0021]
The valve box sheet portion 106 has a sealing surface formed by powder coating of an epoxy resin at a portion facing the upper sheet portion 107a and the lower sheet portion 107b.
[0022]
In the above configuration, when fully closed, the valve body seat portion 107 is pressed against the valve box seat portion 106 in the axial direction of the valve stem 102, and both sealing surfaces are pressure-bonded to ensure sealing performance. For this reason, the valve body 103 has a thick structure in order to prevent the deformation of the portion 103 a that receives the pressing force by the valve stem 102 via the female screw piece 104.
[0023]
Further, in order to ensure a sufficient sealing performance, it is necessary that the sealing surface of the valve body seat portion 107 and the sealing surface of the valve box seat portion 106 be in pressure contact with a sufficient area. For this reason, the upper sheet part 107a of the valve body sheet | seat part 107 protrudes in the thickness direction of the valve body 103 from the upstream side surface and downstream side surface of the valve body 103 for the purpose of forming the sealing surface of predetermined width.
[0024]
In order to make the part 103a which receives the pressing force by the valve stem 102 in the valve body 103 into a thick structure, the position where the female screw piece 104 is arranged becomes higher as the thickness is increased. Further, if the portion 103a that receives the pressing force by the valve stem 102 in the valve body 103 has a thick structure, the height dimension of the valve body 103 increases and the storage portion 105 increases, so that the total height of the gate valve increases. Become. However, in recent years, it has been required to make the gate valve more compact for economic reasons, and it has been required to reduce the total height of the gate valve.
[0025]
For this reason, it is conceivable to arrange the female screw piece 104 at a position below the upper seat portion 107a. In this case, the upper seat portion 107a extends from the upstream side surface and the downstream side surface of the valve body 103 in the thickness direction of the valve body 103. Since projecting is essential to form a sealing surface with a predetermined width, the dimension in the thickness direction of the valve body 103 is the sum of the dimensions of the female thread piece 104 and the upper seat portion 107a, and the total length of the gate valve is increased. There is a growing problem.
[0026]
On the other hand, as in claim 2, each valve body sheet is composed of an upper valve body sheet formed on the edge of the valve body upper part and a lower valve body sheet formed on the peripheral part of the lower part of the valve body, The joint body sheet is composed of an upper joint body sheet that abuts on the upper valve body sheet and a lower joint body sheet that abuts on the lower valve body sheet, and the upstream upper valve body sheet and the downstream upper valve body sheet are An upper joint body sheet that contacts the upper valve body sheet is formed on a downwardly inclined surface toward the lower part of the joint body, and is formed between the upper valve body sheets. If the structure is provided with a female thread piece that is screwed into the male thread portion of the valve stem, the following effects can be achieved.
[0027]
That is, since the upper valve body sheet and the upper joint body sheet are fitted in a wedge shape, the dimension of the upper valve body sheet in the thickness direction of the valve body can be reduced even if the width of the seal surface is sufficiently secured. Even if the female screw piece is disposed between the upper valve body sheets, the overall thickness of the valve body can be suppressed to the same size as the conventional one. In addition, since the female screw piece is positioned between the upper valve body seats, the height of the valve body can be reduced, and the overall height of the gate valve can be suppressed to achieve downsizing.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
The pipe joint shown in FIGS. 1, 2, and 3 is a watertight joint of a metal or resin joint pipe 1, and the axial direction of the joint body 2 that is fitted on the outer circumference of the joint pipe 1 with a circumferential clearance. A joint means A for the joint pipe 1 is provided at the end of the joint body 2, and a gate valve B that opens and closes the flow passage in the joint body 2 is provided at an intermediate portion in the axial direction of the joint body 2. Next, the structure of the joint means A will be described.
[0030]
[Structure of joint means A]
As shown in FIGS. 4, 5, and 6, a joint body 2 and a pair of push wheels 3 are provided, and these are fastened by a fastening tool 4 that is a T-shaped bolt and nut. The joint body 2 includes a plurality of flange-shaped second protrusions 2a, and a cylindrical body 2b is integrally provided between the second protrusions 2a, and the inner periphery of the second protrusion 2a is received on the inner periphery thereof. It has a mouth 2c.
[0031]
The pusher wheel 3 also includes a flange-shaped first protrusion 3a. The joint body 2 is positioned on the outer periphery between the joining pipes 1 leaving a circumferential gap, and the pusher wheel 3 is disposed at both ends thereof. A rubber packing ring 5 is set between each pusher wheel 3 and each pusher wheel 3, and is tightened with a fastener 4.
[0032]
Then, as shown in FIGS. 7, 8, and 9, by tightening the fastener 4, the rubber packing ring 5 is pushed by the tip 3b of the pusher wheel 3 to be coupled to the receiving part 2c in a wedge shape and joined. The joining pipe 1 is connected to the outer peripheral surface of the pipe 1 so that the liquid passing through the joining pipe 1 does not leak to the outside. The configuration of each part of this pipe joint will be specifically described.
[0033]
Bolt holes are provided in the protrusions 2 a that are integrally formed on the outer periphery of the joint body 2. Moreover, in the receptacle part 2c formed so that it might expand toward the push ring 3 side at the both ends of the coupling main body 2, as shown in FIG. 7, for example, the press-fit part which is a cylinder surface parallel to the joining pipe | tube 1 in the constriction side. 2d is formed, and a receiving hole portion 2e which is a cylindrical surface parallel to the bonding tube 1 is formed on the side to be expanded.
[0034]
The first projecting portions 3a formed integrally on the outer periphery of the press ring 3 are also provided with bolt through holes, and are tightening tools made of T-type bolts and nuts through the bolt through holes of the press ring 3 and the joint body 2. 4 is inserted and can be tightened.
[0035]
A retaining ring 6 is provided on the inner side of the pusher wheel 3. The pusher wheel 3 is separated at one place in the circumferential direction, and has a structure that can be tightened by the fastening tool 7.
[0036]
Further, as an example, a rubber packing ring 5 made of SBR (styrene butadiene rubber) or the like is provided between the joint body 2 and the joint pipe 1 by the front end 3b of the push ring 3 which is moved by operating the tightening tool 4. It is fitted into the receiving portion 2c by its own elastic deformation caused by direct pressing.
[0037]
As shown in FIGS. 5 and 6, the rubber packing ring 5 is composed of a tip portion 5a on the receiving port portion 2c side and a base portion 5b on the push wheel 3 side. As shown in FIG. Is substantially the same diameter as the inner diameter of the receiving portion 2c so that it can be temporarily fixed to the receiving hole portion 2e which is the inlet of the receiving portion 2c, while the base 5b has an outer periphery only where it is connected to the front portion 5a. The stopper 5c has a diameter larger than the outer diameter of the tip 5a and abuts against the outer peripheral surface 2f of the receiving port periphery.
[0038]
In the case of this embodiment, the inner periphery of the packing ring 5 is larger in diameter than the outer periphery of the joining pipe 1 in its natural state, and the combination of the joint body 2, the packing ring 5, and the press ring 3 assembled in advance is used. When transported to a construction site or the like for construction, the work of attaching the joining pipe 1 to these combinations can be easily performed, and the packing ring 5 is press-fitted into the receiving portion 2c without excessive resistance.
[0039]
Further, the front portion 5a of the packing ring 5 is a soft portion excellent in sealing performance, and the base portion 5b is a hard portion. In addition to the pressure transmitted by the press ring 3 being reliably transmitted to the packing ring 5, the packing ring 5 Since the tip portion 5a is excellent in adhesion and pressure-bonding properties, the sealing performance is good.
[0040]
It is appropriate that the soft portion as the tip portion 5a has a hardness _HA of about 60 ° ± 5 °, and the hard portion as the base portion 5b has a hardness _HA of 90 ° ± 5 °. Further, the tip portion 5a of the packing ring 5 is round in cross section, and the edge angle of the receiving hole portion 2e is also rounded so that the tip portion 5a can be easily inserted into the receiving hole portion 2e.
[0041]
In the base portion 5b of the packing ring 5, for example, as shown in FIG. 7, an outer peripheral side fin portion 5e protruding toward the press wheel side is formed over the entire periphery of the press wheel side outer peripheral edge, and the inner periphery of the outer peripheral side fin portion 5e is The outer diameter of the front end portion of the press wheel 3 is approximately the same.
[0042]
As a result, the pusher wheel 3 that hits the pusher wheel 3 side end surface of the base 5b of the packing wheel 5 is fitted with the tip part 3b tightly inside the outer peripheral fin part 5e, so that the radial positioning of the pusher wheel 3 and the packing wheel 5 can be performed. It will be done automatically.
[0043]
On the other hand, a recess 5f is formed on the side of the stopper 5c that contacts the receiving portion 2c of the base portion 5b, and is caught on the edge of the receiving hole portion 2e that is the opening of the receiving portion 2c and on the opposite side to the traveling direction. The stopper can smoothly enter the receiving portion 2c while elastically deforming so as to warp.
[0044]
The stopper 5c, which is a part of the base 5b, has a hardness _HA of 90 ° ± 5 ° and has appropriate hardness and elastic deformation, so that it exhibits a sufficient stopper function and the temporarily assembled state is greatly collapsed. In addition, the stopper 5c is easily deformed when the packing ring 5 enters the receiving portion 2c.
[0045]
In the case of the pipe joint of the present embodiment, in the temporarily assembled state, as shown in FIG. 7, the stopper 5c of the base part 5b of the rubber packing ring 5 is brought into contact with the outer peripheral surface 2f of the receiving part peripheral edge of the joint body 2, The tip 5 a of the packing ring 5 is temporarily fixed to the receiving hole 2 e that is the inlet of the receiving port 2 c, and the tip 3 b of the push ring 3 that is moved by the operation of the fastener 4 is the base 5 b of the packing ring 5. The outer peripheral side 5e is tightly fitted, and is brought into contact with the end surface of the pusher wheel 3 side.
[0046]
In the temporarily assembled pipe joint, the front part 5a of the packing ring 5 is the inlet of the receiving part 2c so that the stopper 5c of the base part 5b of the packing ring 5 contacts the outer peripheral surface 2f of the receiving part peripheral edge of the joint body 2. The work of assembling the packing ring 5 to the spacer is not required just by temporarily fixing it to the receiving hole 2e, and the packing ring 5 is positioned in the radial direction by the tip 5a inserted into the receiving hole 2e.
[0047]
As a result, the axial positioning of the packing ring 5 is performed by the stopper 5c that contacts the outer peripheral surface 2f of the receiving portion peripheral edge of the joint body 2. Therefore, the radial and axial positioning of the packing ring 5 is very simple. In addition, since no spacer is used, there is no temporary assembly collapse due to the breakage of the spacer, and even when the pipe joint is transported to the site in the temporary assembly state, the temporary assembly state of the pipe joint is difficult to collapse.
[0048]
When the pusher wheel 3 is moved by operating the fastener 4 in a state where the joint pipe 1 is inserted into the temporarily assembled pipe joint after being transported to the site, as shown in FIG. Along with the pressing, the packing ring 5 starts to enter the receiving portion 2c deeply while elastically deforming itself including the stopper 5c.
[0049]
Thereafter, as shown in FIG. 9, the pusher wheel 3 abuts against the first protrusion 2 a of the joint body 2, and the packing wheel 5 is tightly coupled to the press-fitting part 2 d of the receiving part 2 c in a wedge shape, so that the outer peripheral surface of the joining pipe 1 Further, the packing ring 5 is fitted and the joining pipe 1 is connected so that the liquid passing through the joining pipe 1 does not leak to the outside.
[0050]
The stopper 5c smoothly enters the receiving portion 2c on the tip portion side, and the soft tip portion 5a, which is a soft portion, sufficiently adheres and crimps to the press-fitting portion 2d and the outer peripheral surface of the joining tube 1, so that the sealing performance Is good.
[0051]
The pipe joint does not need to be temporarily assembled, and may be transported to the site and installed in a state where each component is disassembled.
[0052]
Next, the structure of the gate valve B will be described.
[0053]
[Structure of gate valve B]
4, 10, 11, and 12, the gate valve B (which is a soft seal valve) has a valve body 14 that moves in and out of the joint body flow passage 13 in the joint body 2. The valve body 14 is provided between the joint main body flow path 13 and the valve body storage space 15 so as to be retractable. The valve body storage space 15 is formed by the valve body storage portion 16 and the lid portion 17 of the joint body 2, and a packing box 18 is provided on the top of the lid portion 17.
[0054]
The valve stem 19 has a male screw portion 19a screwed into a female screw piece 20 attached to the valve body 14, and a cap 21 is attached to the head portion 19b. The valve body 14 is provided with a rubber lining 22 on the entire surface of a hollow substrate portion 14 b having a through hole 14 a for accommodating the male screw portion 19 a of the valve stem 19, and the rubber lining 22 at the edge of the valve body 14 is provided. A valve body sheet 23 is formed.
[0055]
The valve body sheet 23 is composed of an upper valve body sheet 23a formed at the edge of the upstream surface and the downstream surface of the upper part of the valve body, and a lower valve body sheet 23b formed at the periphery of the upstream surface and the downstream surface of the lower part of the valve body. Thus, the upper valve body seat 23a and the lower valve body seat 23b are continuous at both ends. The joint body 2 is provided with a joint body sheet 24 including an upper joint body sheet 24a in contact with the upper valve body sheet 23a and a lower joint body sheet 24b in contact with the lower valve body sheet 23b.
[0056]
The upstream and downstream upper valve body seats 23a form an inclined surface with a downward slope toward the lower part of the valve body. With this structure, the valve body 14 forms a wedge structure on the upper side. The valve body 14 holds a female screw piece 20 between both upper valve body sheets 23a. Hereinafter, the operation of the above-described configuration will be described. The opening / closing operation of the valve body 14 is performed by rotationally driving the cap 21 and the valve stem 19. The rotation of the valve stem 19 causes the female thread piece 20 and the valve element 14 to move in the axial direction of the valve stem 19, and the valve element seat 23 abuts on the joint body sheet 24 to fully close the flow path inside the joint body 2. It retracts over the position and the position where it is retracted in the valve body storage part 16 and the flow path inside the joint body 2 is fully opened.
[0057]
In the fully closed state of the valve body 14, the valve body 14 contacts the inner surface of the joint body 2 via the rubber lining 22, and the upper valve body sheet 23a and the lower valve body sheet 23b of the rubber lining 22 are respectively an upper joint body sheet 24a. And it press-contacts to the lower joint main body sheet | seat 24b, forms the contact surface with respect to the joint main body inner surface with sufficient width | variety, and exhibits the sealing performance.
[0058]
When the valve element 14 is fully closed, the operating force of the valve rod 19 acts on the valve element 14 via the female screw piece 20. At this time, since the upper valve body sheet 23a is fitted in a wedge shape with the upper joint body sheet 24a, a sufficient surface pressure is generated between the sealing surfaces of the upper valve body sheet 23a and the upper joint body sheet 24a.
[0059]
[Another embodiment]
The fastener 4 may be other than a screw type.
[Brief description of the drawings]
1 is a front view of a pipe joint. FIG. 2 is a plan view of the pipe joint. FIG. 3 is a side view of the pipe joint. FIG. 4 is a longitudinal front view of the pipe joint. [Fig. 5] A cross-sectional view taken along line AA in Fig. 5 [Fig. 7] A vertical cross-sectional view showing a temporarily assembled state of the pipe joint [Fig. 8] A vertical cross-sectional view showing a state of the first half of the pipe joint construction [Fig. FIG. 10 is a front view of the valve body. FIG. 11 is a plan view of the valve body. FIG. 12 is a longitudinal sectional view of the valve body. Fig. 14 is a cross-sectional view showing a conventional pipe joint spacer. Fig. 15 is a cross-sectional view showing a conventional pipe joint spacer. Fig. 16 is a partially cutaway front view of a conventional gate valve. Front view of valve body of gate valve [FIG. 18] Cross-sectional view of valve body of conventional gate valve [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Joining pipe 2 Joint main body 2a 2nd protrusion part 2c Receptacle part 2f Receptacle part peripheral outer surface 3 Push ring 3a 1st projection part 3b Tip part 4 Fasteners 5 and 5A Packing ring 5a Tip part 5b Base part 5c Stopper 14 Valve body 19 Valve rod 19a Male thread part 20 Female thread piece 23 Valve body sheet 23a Upper valve body sheet 23b Lower valve body sheet 24 Joint body sheet 24a Upper joint body sheet 24b Lower joint body sheet A Joint means B Partition valve

Claims

A joint means for the joint pipe is provided at an end in the axial direction of the joint body that is fitted to the outer circumference of the joint pipe with a circumferential gap, and a flow path in the joint body is provided at an intermediate part in the axial direction of the joint body. A gate valve that opens and closes
The joint means is provided with a press ring having a first protrusion on the outer periphery and fitted on the outer periphery of one end side of the joint pipe, and a first end facing the first protrusion on the side facing the press ring at the end of the joint body. Forming a projecting portion on the inner peripheral side of the second projecting portion and extending toward the push ring, and providing a fastener capable of moving the push wheel in the direction of the joint body; And a packing ring that is fitted to the receiving portion by its own elastic deformation caused by direct pressing by the pressing ring that is provided between the inside and outside of the joint pipe and moves by the operation of the fastener,
The packing ring is composed of a front part on the side of the receiving part and a base part on the side of the push ring, and the front part has an outer periphery substantially the same diameter as the inner diameter of the receiving part so that it can be temporarily fixed to the inlet of the receiving part. In addition, the base is formed so that the outer periphery is larger than the outer diameter of the front portion and serves as a stopper that contacts the outer peripheral surface of the receiving portion, as long as it is connected to the front portion.
The gate valve is configured to apply a rubber lining to a valve body movable in the axial direction of the valve stem over a fully closed position and a fully open position of the flow path, and to form a valve body sheet formed on the valve body by the rubber lining, A valve body sheet that is configured to seal between the joint body and the valve body by pressing against a joint body sheet formed on the body, and that independently exhibits sealing performance on the upstream surface and the downstream surface of the valve body. Formed pipe fittings.

Each valve body sheet is composed of an upper valve body sheet formed on the edge of the upper part of the valve body and a lower valve body sheet formed on the peripheral edge of the lower part of the valve body, and the joint body sheet is applied to the upper valve body sheet. The upper joint body sheet is in contact with the lower joint body sheet, and the lower joint body sheet is in contact with the lower valve body sheet. The upper joint body sheet that contacts the upper valve body sheet is formed on the inclined surface with a downward slope toward the lower part of the joint body, and is screwed into the male threaded portion of the valve stem between both upper valve body sheets. The pipe joint according to claim 1, wherein a screw piece is provided.