JP3902090B2

JP3902090B2 - Valve device

Info

Publication number: JP3902090B2
Application number: JP2002224065A
Authority: JP
Inventors: 泰三山本; 純一上田
Original assignee: Nabtesco Corp
Current assignee: Nabtesco Corp
Priority date: 2002-07-31
Filing date: 2002-07-31
Publication date: 2007-04-04
Anticipated expiration: 2022-07-31
Also published as: JP2004060871A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば清浄性が要求される食品、薬品等の流体を対象とした通路の連結に好適に用いられる弁装置に関する。
【０００２】
【従来の技術】
上述した弁装置として、例えばサニタリー用継手が知られている。この継手は、図１２（ａ）及び（ｂ）に示すように、内部流体通路１０２を有する雌継手１０１と、内部流体通路１１２を有する雄継手１１１とが用いられ、内部流体通路１０２および１１２はそれぞれ別の流体通路に接続される。雌継手１０１は、その上端に突き合わせ面１０１ａを有し、雄継手１１１はその下端に突き合わせ面１１１ａを有し、これら両突き合わせ面１０１ａ、１１１ａは互いに同一軸線上で突き合わされる。突き合わせ後、雌継手１０１に設けた弁体１０３を弁座１０４から離れるようにスライドさせるとともに、雄継手１１１に設けた弁体１１３を弁座１１４から離れるようにスライドさせ、これによりそれぞれの内部流体通路１０２、１１２が連通する接続状態（図１２（ｂ）の状態）になる。逆に、弁体１０３を弁座１０４に、弁体１１３を弁座１１４にそれぞれ接触させることで遮断され、かつ両突き合わせ面１０１ａ、１１１ａを互いに離すことで、内部流体通路１０２、１１２がそれぞれ切離された状態（図１２（ａ）の状態）になる。
【０００３】
前記弁体１０３および１１３は、それぞれに設けられた軸部１０５および１１５と、これら軸部１０５および１１５をそれぞれ支持する軸受１０６および１１６とによりスライド可能に支持されており、軸部１０５の途中に設けたフランジ１０７と軸受１０６との間が可撓性膜１０８にて覆われ、かつ軸部１１５の途中に設けたフランジ１１７と軸受１１６との間が可撓性膜１１８にて覆われている。前記可撓性膜１０８および１１８は、内部流体通路１０２、１１２が連通する接続状態のとき、軸部１０５、１１５と軸受１０６、１１６との摺動部分である隙間に、移送される流体が入って残るのを防止するために設けられている。
【０００４】
【発明が解決しようとする課題】
ところで、上述した可撓性膜１１８は、図１２および図１３（雄継手１１１側を示す）に示すように、軸部１１５を２分割した一方の分割軸部１１５ａとフランジ１１７との間に、他方の分割軸部１１５ｂにて押圧した状態で挟み込まれて設けられており、もう一方の可撓性膜１０８も同様にして設けられている。この構成を採用するのは、可撓性膜１０８等の端部を軸部に直接固着することが困難である故に、軸部を分割してその間を固着部として用いるためである。
【０００５】
したがって、従来の継手による場合には、分割軸部１１５ａ等とフランジ１１７等との接合部Ｘが内部流体通路１１２等に露出しているため、その接合部Ｘに、移送される流体が入り込んで残る虞があり、改善の余地があった。
【０００６】
また、弁体１０３、１１３は、先端の弁頭部１０３ａ、１１３ａの周囲に、弁座１０４、１１４に当接するリング状の当接部材１０３ｂ、１１３ｂが別部材により取付けられているため、弁頭部１０３ａ、１１３ａに当接部材１０３ｂ、１１３ｂとの間で生じる隙間形成部が存在し、その隙間形成部でも移送される流体が入り込んで残る虞があり、改善の余地があった。
【０００７】
本発明は、このような従来技術の課題を解決するためになされたものであり、弁頭部における隙間形成部を無くし、かつ、軸受とこれにより支持される部分との間の隙間を簡潔な構造で遮蔽することができる弁装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、少なくとも開弁状態で内部流体を通流しているときに、該弁枠体側シール部分と接触するリング状の弁枠体側ガイドが設けられ、該弁枠体側ガイドが弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持されることを特徴とする。
【０００９】
この弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁枠体と軸部材との境界部分と、それに対応する弁枠体側シール部分との間にリング状の弁枠体側ガイドが設けられ、その弁枠体側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいて弁枠体側シール部分と接触するので、これにより弁枠体側シール部分に及ぶ圧力を低減させてシール部の耐久性を向上させ得る。また、弁枠体側ガイドが、弁枠体と移動部材とにより撓み変形可能に支持されているので、弁枠体側シール部分を変形部として利用することができる。
【００１０】
請求項２の発明に係る弁装置は、請求項１に記載の弁装置において、軸部材が閉弁状態から開弁状態にスライドする途中から移動部材を弁枠体が支持し、かつ軸部材が開弁状態から閉弁状態にスライドする途中から移動部材を軸部材が支持し、弁枠体に支持されてから軸部材に支持されるまでの間では移動部材を非移動状態とする移動部材の追従機構が設けられていることを特徴とする。
【００１１】
この弁装置にあっては、弁枠体側ガイドを支持する移動部材が、軸部材のスライド量に比べて移動量が短く、これにより弁枠体側ガイドが撓む量を小さくすることが可能となり、弁枠体側ガイドの耐久性も向上させ得る。
【００１２】
請求項３の発明に係る弁装置は、請求項１または２に記載の弁装置において、シール部における弁枠体に固定された端部に最も近い位置に形成される内側湾曲部から該端部までが、連続して軸受側寄りに位置するとともに、該端部が第２接続口の軸受側部分よりも第１接続口側に位置するように、前記弁枠体側ガイドがシール部を規制することを特徴とする。
【００１３】
この弁装置にあっては、第２接続口の軸受側部分から、弁枠体に固定されたシール部端部に最も近い位置に形成される内側湾曲部までが、連続的に第１接続口側に位置するので、これにより内部流体通路を流れる内部流体を淀ませるような窪みの形成が無くなる。また、上記窪みの形成が無いため、弁洗浄を行うとき、窪みに伴う洗浄効率の低下を防止することが可能となる。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づき具体的に説明する。
【００１５】
図１は、本発明の弁装置を適用したサニタリー用の継手を示す縦断面図であり、閉弁状態を示す。図２はその継手が開弁状態となっているときを示す縦断面図、図３はその継手の開弁状態（左側）と開弁状態（右側）とを併せて示す縦断面図である。
【００１６】
この継手１は、内部流体通路３を有する弁枠体２と、スライド機構４によりスライドされる軸部材５と、その軸部材５の途中を支持し、弁枠体２の一部を構成する軸受６と、軸部材５の先端部に取付けられた弁体１０とを備える。
【００１７】
弁枠体２には、内部流体通路３の一端（上側）に第１接続口３ａが、その他端（右側）に第２接続口３ｂがそれぞれ設けられている。第１接続口３ａは、例えば移送先（または移送元）に繋がった別の継手（図示せず）に、着脱可能な状態で連結され、第２接続口３ｂは、例えば移送元（または移送先）に繋がったホース等の配管（図示せず）に連結される。
【００１８】
上記軸部材５は、弁枠体２の内部に設けられ、基端側に設けられたスライド機構４により第１接続口３ａに対して接離する方向へスライド可能となっている。軸部材５の途中は、軸受６によりスライド自在に支持されている。スライド機構４は、例えば空気アクチュエータ、電磁石或いは手動ハンドル等の公知手段が用いられる。
【００１９】
軸部材５の外側には、先端（図の上端）よりも少し基端側（図の下側）に寄った位置から軸受６にて支持される部分よりも少し先端側に寄った位置までの間に変形規制部２０が軸部材５と一体に設けられている。この変形規制部２０は、軸部材５の他の部分よりも半径が長く形成され、先端側から、外周面が軸方向に沿って湾曲した湾曲部２１と、追従機構の一部として機能する３つの段差部２２、２３、２４とを有し、各段差部２２、２３、２４の外径はそれぞれ異なる値でスライド方向に沿って一定に設定されている。具体的には、段差部２２の外径が最も小さく、段差部２４の外径が最も大きく、段差部２３の外径は両者の間に設定されている。なお、変形規制部２０は、湾曲部２１の代わりに、外周面がほぼ同一直径を有する形状、或いは、外周面の先端側が基端側よりも徐々に縮径または拡径した形状、或いは他の任意の外周面形状にすることができる。
【００２０】
上記弁体１０は、上述したように軸部材５の先端部に取付けられ、表層部１１ａと取付部１１ｂとを有する弁頭部１１と、弁頭部１１の表層部１１ａから軸受６側に延出された円筒状のシール部１２とを備える。取付部１１ｂは金属や他の非可撓性材料からなり、この取付部１１ｂには軸部材５の先端部が螺着されていて、表層部１１ａおよびシール部１２の全体は、合成樹脂、例えばテフロン（ＰＴＦＥ：四フッ化エチレン樹脂）により一体成形にて形成されている。弁頭部１１は、軸部材５が第１接続口３ａへの接近スライドにより、第１接続口３ａの周縁部３ｃに当接する進出限位置に移動すると、第１接続口３ａを閉弁状態にし（図１参照）、軸部材５の第１接続口３ａからの離隔スライドにより、第１接続口３ａの周縁部３ｃから離隔して第１接続口３ａを開弁状態にする（図２参照）。ここで、開弁状態とは、軸部材５が離隔スライドにより後退限位置にまで後退した状態をいう。
【００２１】
上記弁頭部１１の最大径部１１ｃから軸受６側に、シール部１２が延出されて袋状に形成されていて、そのシール部１２の基端側は、開口端となっている。その開口端の全周は、複数に分割された弁枠体２の一部と軸受６の境界面２ａで挟持することで固定されている。これによりシール部１２は、軸受６と軸部材５との摺接する部分を内部流体通路３から区画している。なお、シール部１２を固定する弁枠体２の開口面積は、第１接続口３ａの開口面積とほぼ同等にすることが好ましい。
【００２２】
上記境界面２ａには、図４（ｂ）に示す弁枠体側ガイド１４の外周部１４ａも挟持されている。この弁枠体側ガイド１４は、後述する弁枠体側シール部分１２Ｂの変形を規制するもので（図３参照）、例えばゴム等の弾性材料からなる円リング状のものであって、断面形状は内周側が概略三角形状、外周側がほぼ厚み一定に形成されている。断面形状が概略三角形状をした内周部１４ｂは、前記段差部２２と、弁枠体２の境界面２ａより内側に設けた凹状の切欠部６ｂとの間、つまり変形規制部２０と弁枠体２の境界部分の凹部に配置される。また、弁枠体側ガイド１４の軸受６側には円リング状をした移動部材１５が配されている。
【００２３】
この移動部材１５は、下端の内周側が切欠かれた、追従機構の一部として機能する段付部１５ａを有し（図３参照）、軸部材５のスライドにより、そのスライド方向に追従移動する。具体的には、軸部材５が進出限位置にあるときは、移動部材１５の段付部１５ａが、段差部２３と２４の間の部分と係合し、下端が切欠部６ｂから浮いた状態となる。軸部材５がその状態から後退していくと、それに伴って移動部材１５は下に降下していき、ある位置まで降下すると、移動部材１５の下端が切欠部６ｂと係合（接触）するようになる。その後、更に軸部材２５が後退限位置まで離隔スライドしても、移動部材１５は切欠部６ｂに規制されて非移動状態になる。更に、その後退限位置から前側に接近スライドを行って段差部２３と２４の間の部分が切欠部６ｂの底面よりも高くなると、移動部材１５の段付部１５ａが、段差部２３と２４の間の部分と係合するようになり、その後は下端が切欠部６ｂから浮いた状態となる。このような移動部材１５の追従移動は、軸部材５のスライドに伴って同様に繰り返す。
【００２４】
そして、この移動部材１５の追従移動により、弁枠体側ガイド１４が変形可能となる。具体的には、閉弁状態においては、図１および図３の左側に示すように弁枠体側ガイド１４の下端側が段差部２２と２３の間で係合して、弁枠体側ガイド１４は弾性により圧縮変形可能であるが形状変形（撓み変形）をしない状態となる。これに対して、開弁状態においては、図２および図３の右側に示すように移動部材１５の移動により段差部２２と２３の間が降下し、弁枠体側ガイド１４の下側に隙間が形成されるため、弁枠体側ガイド１４は、開弁状態とされることで変形するシール部１２の下端部分で下側に押圧されることにより、下側に撓む形状変形が可能となる。
【００２５】
弁頭部１１の背面側には、図４（ａ）に示す弁頭部側ガイド１３が接着等により取付けられている。この弁頭部側ガイド１３は、後述する回り込み部分１２Ｃの変形を規制するもので（図３参照）、例えばゴム等の弾性材料からなる円リング状のものであって、断面形状は内周側が厚く外周側が薄い三角形状となっており、弁頭部側ガイド１３の内側には、軸部材５の先端部が挿通している。なお、弁頭部側ガイド１３は、非可撓性の取付部１１ｂと一体に形成してもよい。
【００２６】
上記シール部１２は、軸部材５のスライドに伴って変形する。そのシール部１２の変形は、本実施形態では、図３に示すように、軸部材５（または弁体１０）が進出限位置（図１に示す位置）にある閉弁状態のときに、途中部分１２Ａ（シール部１２の回り込み部分１２Ｃと弁枠体側シール部分１２Ｂを除く部分）は変形規制部２０の外周面、実質的には湾曲部２１と接触し、その変形規制部２０の外周面の形状に応じた形状とされ、軸部材５が後退限位置（図２に示す位置）にある開弁状態となっても、つまり開弁・閉弁状態に拘わらず変形規制部２０の外周面と接触したままであり、その外周面の形状に応じた形状のままである（但し、変形規制部２０との接触位置の変化により若干の形状変化は伴う）。また、シール部１２の弁頭部１１の背面側に回り込んでいる回り込み部分１２Ｃは、開弁状態のときには、弁頭部側ガイド１３に接触し、弁頭部側ガイド１３の外周面に応じた形状とされ、この形状変化に伴って、回り込み部分１２Ｃから途中部分１２Ａまでの全域が変形規制部２０と接触し、その変形規制部２０の外周面の形状に応じた形状とされる。そして、開弁状態から閉弁状態に軸部材５が移動するに伴って、回り込み部分１２Ｃは軸部材の軸心から離れるように拡径しながら弁頭部側ガイド１３から離れていく。よって、シール部１２の弁頭部１１側は、弁頭部側ガイド１３に接触する回り込み部分１２Ｃと、変形規制部２０に接触する途中部分１２Ａとの境界部分１２Ｅが湾曲変形する。また、シール部１２の境界面２ａにて固定された端部から途中部分１２Ａまでの弁枠体側シール部分１２Ｂは、軸部材５の後退により移動部材１５が降下して形状変形可能となった弁枠体側ガイド１４を下側に押し付ける状態となる。つまり、弁枠体側ガイド１４の内周面側を下側に押した状態に撓み変形させ、その弁枠体側ガイド１４の外周面の一部と接触する。そして、弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｆでは、下側に隙間が形成され、かつその隙間のある箇所が湾曲した状態とされる。一方、軸部材５が開弁状態から閉弁状態に移動するに伴って、弁枠体側シール部分１２Ｂは、軸部材の軸心から離れるように拡径しながら軸受６から離れていく。これに伴って、撓み変形していた弁枠体側ガイド１４が元の状態に戻る。なお、この段落では、流体からの圧力が作用しない、つまり配管に接続する前の状態におけるシール部１２各部が形状変化の状態を説明している。
【００２７】
すなわち、本実施形態のシール部１２にあっては、途中部分１２Ａは開弁・閉弁状態に拘わらず変形規制部２０に接触してその周面に応じた形状とされるため、ほぼ変形をしない。これに対して、回り込み部分１２Ｃと途中部分１２Ａとの境界部分１２Ｅが湾曲変形し、回り込み部分１２Ｃの傾きが変化する。同様に、弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｆが湾曲変形し、弁枠体側シール部分１２Ｂの傾きが変化する。つまり、シール部１２の途中部分１２Ａよりも端側の両端側、特に回り込み部分１２Ｃと途中部分１２Ａとの境界部分１２Ｅ、および弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｆが変形部として機能する。なお、弁体１０が後退限位置（つまり、開弁状態）にあるとき、シール部１２は弁頭部１１ａと繋がる部分より軸受６側が連続して軸受６側寄りに位置し、弁頭部１１ａ側へ折り返しされることがないような形状状態に設計されており、また、弁枠体側ガイド１４は、開弁状態（流体の圧力が作用しないとき）にあるとき、上述したように移動部材１５の移動により下側に撓む形状変形を生じても、前記の形状状態とするように設計されている。当然のことながら、内部流体通路３に流体を流した場合でも、前記の形状状態が維持されるようになっている。
【００２８】
したがって、第１実施形態の継手１にあっては、弁体１０が、弁頭部１１から軸受６側に延出されて弁枠体２に固定された筒状シール部１２までが一体形成されているので、従来のようにリング状の当接部材（１０３ｂ、１１３ｂ）を使用することなく、弁頭部１１における隙間形成部を無くすことが可能となる。また、シール部１２が軸受６と軸部材５との摺接する部分を内部流体通路３から区画するので、軸受６とこれにより支持される軸部材５との摺接する部分を遮蔽することができる。更に、弁体１０は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部１２の基端側の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造にすることができる。
【００２９】
また、第１実施形態にあっては、配管に接続して流体が流れるようにした開弁状態、つまり使用状態において、内部流体通路３を流れる内部流体から途中部分１２Ａに作用する圧力を変形規制部２０で受けるようにすることができ、これにより途中部分１２Ａが受ける圧力を減少させ得、シール部１２の耐久性を向上させることが可能となる。更に、シール部１２の回り込み部分１２Ｃと弁頭部１１ａの背面側との間にリング状の弁頭部側ガイド１３が設けられ、その弁頭部側ガイド１３が、開弁状態においてシール部１２の回り込み部分１２Ｃを受けるので、回り込み部分１２Ｃに及ぶ圧力を低減させてシール部１２の耐久性を向上させ得る。更に、弁枠体２と軸部材５との境界部分と、それに対応する弁枠体側シール部分１２Ｂとの間にリング状の弁枠体側ガイド１４が設けられ、その弁枠体側ガイド１４が、開弁状態において弁枠体側シール部分１２Ｂを受けるので、これにより弁枠体側シール部分１４に及ぶ圧力を低減させてシール部１２の耐久性を向上させ得る。また、弁枠体側ガイド１４が、弁枠体２と移動部材１５とにより撓み変形可能に支持されているので、弁枠体側シール部分１２Ｂを変形部として利用することができる。
【００３０】
また、本実施形態においては、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れ、開弁状態のとき、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるので、換言すれば、回り込み部分１２Ｃの径が拡大しながら弁頭部１１から離れるとともに、弁枠体側シール部分１２Ｂの径が拡大しながら軸受６から離れて、弁体１０が開弁状態から閉弁状態に移動可能となっているとともに、軸部材５のスライドに伴う回り込み部分１２Ｃおよび弁枠体側シール部分１２Ｂの径の拡大程度が、途中部分１２Ａでの径の拡大程度よりも大きいので、シール部１２の途中部分１２Ａよりも端側の両端部が、軸部材５のスライドに伴って傾きが変化し、シール部１２の変形部として機能するため、これによりシール部１２の変形部を両端に分散させることができ、結果としてシール部１２の径を小径に抑えることができ、これによりシール部１２の小型化が図れる。また、シール部１２の変形部を両端に分散させることにより、軸部材５のスライド量も大きく設計することが可能となる。
【００３１】
なお、上述した実施形態では、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れるようにしているが、本発明はこれに限らず、閉弁状態のとき、シール部１２の弁枠体側シール部分１２Ｂが弁枠体側ガイド１４から離れるようしたり、或いは、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れるとともに弁枠体側シール部分１２Ｂが弁枠体側ガイド１４から離れるようにしてもよい。更に、閉弁時に回り込み部分１２Ｃが弁頭部側ガイド１３に支持可能に、弁枠体側ガイド１４と同様に弁頭部側ガイド１３を移動可能にしてもよい。
【００３２】
また、上述した実施形態では、開弁状態（流体の圧力が作用しないとき）とすることで、回り込み部分１２Ｃが弁頭部側ガイド１３に接触するようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、回り込み部分１２Ｃが弁頭部側ガイド１３に接触せずに、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、回り込み部分１２Ｃが弁頭部側ガイド１３に接触するように設計してもよい。
【００３３】
また、上述した実施形態では、開弁状態（流体の圧力が作用しないとき）とすることで、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４と接触せず、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるように設計してもよい。
【００３４】
また、上述した実施形態では、開弁・閉弁状態（流体の圧力が作用しないとき）に拘わらず、途中部分１２Ａが変形規制部２０に接触するようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、途中部分１２Ａが変形規制部２０に接触せず、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、途中部分１２Ａが変形規制部２０に接触するように設計してもよい。
【００３５】
また、上述した実施形態では、変形規制部２０で途中部分１２Ａを、弁枠体側ガイド１４で弁枠体側シール部分１２Ｂを、弁頭部側ガイド１３で回り込み部分１２Ｃをそれぞれ規制するようにしているが、本発明はこれに限らない。例えば、変形規制部２０に加えて、弁枠体側ガイド１４または弁枠体側シール部分１２Ｂの少なくとも一方を有する構成としてもよい。このような構成としても、シール部１２は、内部流体通路３を流れる流体による圧力を受けても破れることがないので、内側に補強用の膜を別途設ける必要性がなく、シール部１２単体でシールを行うことが可能である。その理由は、弁枠体側ガイド１４または弁頭部側ガイド１３の一方を省略してもシール部１２の大部分を他方のガイドと変形規制部２０とで受けることができ、省略したガイドが受ける筈のシール部１２の部分の面積が小さく、破断し難いからである。但し、前記面積が大きくなるような弁装置の場合には、変形規制部２０に加えて、弁枠体側ガイド１４および弁頭部側ガイド１３の両方を備えた構成とするのが、シール部１２の破断防止を図る上で好ましい。また、シール部１２が破断する虞がある場合には、破断の虞がある部分或いはシール部１２の全域の内側に補強用の膜を別途設けるようにしてもよい。
【００３６】
また、上述した実施形態では変形規制部２０を軸部材５とは一体構成としているが、本発明はこれに限らず、変形規制部を軸部材と別構成としてもよい。このようにしても、変形規制部と軸部材との境界は、シール部により内部流体通路３とは区画される。
【００３７】
また、本実施形態の場合には、シール部が筒状である故に、例えば特開平１０−２０５６２８号公報に開示された円錐状をしたダイアフラム弁（公報中の４０）を用いる場合、或いは、特開２００２−１２２２５３号公報に開示された円錐状のダイアフラム部（公報中の２）を有する弁（公報中の１）を用いる場合に比べ、以下のような有利な点がある。即ち、上記テフロンは、伸び率がゴムなどに比べて非常に低い。このような合成樹脂を用い、筒状シール部に代えて、弁頭部１１ａ側から軸受６側に向けて徐々に拡径した概略円錐状のダイアフラムをシール部として形成した場合は、軸部材５のスライド量がダイアフラムの傾き具合によるため、そのスライド量を例えば配管径の２５％に相当する寸法となるようにするには、配管径よりも遙かに大きい径のダイアフラムを要する。
【００３８】
そこで、本実施形態のように筒状シール部とすると、同径のダイアフラムに比べて伸縮長を長くすることができる。すなわち、筒状シール部を軸方向に伸ばすことで、伸縮する部分の距離が長くなり、テフロンのように伸び率が非常に低い樹脂等を用いても伸縮長が長くなる。よって、ダイアフラムよりも小径に形成することができる。また、図５に示すように途中部分１２Ａに、内側に湾曲した複数、図示例では２つの鼓状部１２Ｄを有する構成にすると、より伸縮長が長くなる。
【００３９】
なお、自然流下のパイプラインを組み替える工場設備の場合には、上述のような弁装置が数十個まとめて同一平面上に設置される。このような工場設備において、本発明のように筒状シール部にすることで、ダイアフラムにする場合よりも小径とすることができるため、工場設備の設置面積を小さくすることが可能となる。
【００４０】
更に、シール部を筒状に形成することにより、筒状シール部の径を配管径とほぼ同径寸法にすることが可能となる。なお、ダイアフラムを折り曲げて使用することにより、ダイアフラム径を小さくすることが考えられるが、ダイアフラムの折り曲げ部が凹状になって、その部分に内部流体が残存して好ましくない。
【００４１】
第１実施形態の弁装置は、筒状シール部を用いるので、折り曲げた状態にすることなく開弁・閉弁状態にすることができ、前述のようにシール部１２の弁頭部１１ａと繋がる部分より境界面２ａで固定された端部（下端部）までは、軸受６側が連続して軸受６側寄りに位置するとともに、図１および図２に示すように前記下端部が第２接続口の軸受側部分よりも第１接続口３ａ側に位置するため、前記凹状になる部分の発生を抑制して内部流体の残存を防止し、これにより洗浄性能、つまり内部流体を簡単に洗い流す性能および洗浄用流体の残留を減らす性能を向上させ得る。但し、本発明は、弁枠体側ガイドのみを備える構成の場合においては、上述のような利点を有する筒状シール部に限らず、ダイアフラム状のシール部に対しても、適用することができるのは勿論のことである。
【００４２】
また、上述した実施形態では筒状のシール部１２は、軸部材５の離隔スライドに伴って弁体が第１接続口３ａを開弁状態とする後退限位置にあるとき、内側になだらかに湾曲変形するよう設計されているが、本発明はこれに限らない。例えば、シール部１２の軸心方向の一部が内側または外側に断面「く」の字状に屈伸変形するように設計してもよい。但し、その場合にあっても、流体が溜まり難くなって残留することを防止でき、また洗浄性に優れるものとなるように、屈伸変形する部分より軸受６側が連続して軸受６側寄りに位置するように設計しておくことが好ましい。
【００４３】
また、シール部が断面「く」の字状に屈伸変形する場合、そのシール部は、弁体が第１接続口３ａを開弁状態とする後退限位置にあるとき、つまり折れ曲がり部分の内角が最小となるときに、各部寸法を定め、その寸法で金型の設計或いは切削時の寸法を決定し、作製するのが好ましい。このようにすると、シール部の折れ曲がり部分は、弁体が後退限位置にあるときに、内部応力が発生せず、繰り返し変形を受けても応力集中に伴って亀裂或いは破損が発生するのを防止できるからである。
【００４４】
或いは、弁体が後退限位置にある、つまり折れ曲がり部分の内角が最小となるときと、弁体が第１接続口３ａを閉弁状態とする前進限位置にある、つまり折れ曲がり部分の内角が最大となるときとの間の角度のときに、各部寸法を定め、その寸法で金型の設計或いは切削時の寸法を決定し、シール部を作製するのが好ましい。このようにすると、シール部の折れ曲がり部分は、弁体が後退限位置にあるときに圧縮力が軽減され、しかも弁体が前進限位置にあるときに引っ張り力が軽減されるので、繰り返し変形を受けても応力集中に伴って亀裂或いは破損が発生するのを、より効果的に防止できるからである。なお、この場合において、各部寸法を定める角度は、経験的に決めればよい。
【００４５】
更に、上述した実施形態では筒状シール部１２として途中部分１２Ａがなだらかに内側に湾曲するものを使用しているが、本発明はこれに限らない。例えば、図５〜図１０に示すように、開弁状態において、途中部分１２Ａや弁枠体側シール部分１２Ｂに、外側に湾曲した部分を有するシール部、或いは、図１１に示すように、開弁状態において、途中部分１２Ａの弁枠体側シール部分１２Ｂ側が内側に更に大きく湾曲した部分を有するシール部を使用することもできる。このような図示例の場合には、変形規制部２０のみを軸部材５に設けた構成としているので、シール部１２としてはテフロン膜２５（前記１２に相当）の内側に補強用の膜２６を別途設けた構成としている。なお、膜２６の内部の破線にて示す部分２６ａは、布等の補強部材である。
【００４６】
上述した図５に示すような複数、図示例では２つの鼓状部１２Ｄを有するシール部の場合には、前述したように個々の鼓状部１２Ｄが内側へ湾曲変形して伸縮長が長くなるので、軸部材５のスライド量を著しく大きく設計することが可能となる。また、図６〜図１１に示すようなシール部を用いる場合には、少なくともシール部の途中部分が変形規制部２０にて規制される故に、シール部の耐久性を向上させ得る。
【００４７】
また、上述した実施形態では、弁枠体側ガイドに対し、これを撓み変形させる移動部材および追従機構（段差部２２〜２４や段付部１５ａなど）を設けているが、本発明は弁枠体側ガイド側だけでなく、弁頭部側ガイドに対しても同様な移動部材や追従機構を設けるようにしてもよい。
【００４８】
また、上述した実施形態ではシール部と繋がった弁頭部の表層部１１ａをテフロンで、取付分１１ｂを別材料でそれぞれ形成しているが、本発明はこれに限らず、弁頭部およびシール部の全体をテフロン等の同一材料で形成してもよい。
【００４９】
また、上述した実施形態では弁体の合成樹脂としてテフロンを用いているが、本発明はこれに限らず、可撓性を有する一般の合成樹脂を用いることもできる。特に食品、薬品等の流体である場合には、耐薬品性に優れるテフロン、ＰＦＡ（四フッ化エチレン・パーフルオロアルコキシエチレン共重合樹脂）或いはＦＥＰ（四フッ化エチレン・六フッ化プロピレン共重合樹脂）などを用いるのが好ましい。
【００５０】
また、上述した実施形態ではサニタリー用継手に適用しているが、本発明はこれに限らず、その他の各種継手或いは開閉動作を行わせる弁に広く適用することができる。
【００５１】
【発明の効果】
以上詳述したように、本発明の請求項１に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、少なくとも開弁状態で内部流体を通流しているときに、該弁枠体側シール部分と接触するリング状の弁枠体側ガイドが設けられ、該弁枠体側ガイドが弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持されるので、以下の効果を有する。即ち、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁枠体と軸部材との境界部分と、それに対応する弁枠体側シール部分との間にリング状の弁枠体側ガイドが設けられ、その弁枠体側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいて弁枠体側シール部分と接触するので、これにより弁枠体側シール部分に及ぶ圧力を低減させてシール部の耐久性を向上させ得る。また、弁枠体側ガイドが、弁枠体と移動部材とにより撓み変形可能に支持されているので、弁枠体側シール部分を変形部として利用することができる。
【図面の簡単な説明】
【図１】本発明の弁装置を適用したサニタリー用の継手を示す縦断面図であり、閉弁状態を示す。
【図２】図１の継手が開弁状態となっているときを示す縦断面図である。
【図３】図１の継手の閉弁状態（図左側）と開弁状態（図右側）とを示す縦断面図である。
【図４】（ａ）は図１の継手に設けられた弁頭部側ガイドを示す縦断面図、（ｂ）は同弁枠体側ガイドを示す縦断面図である。
【図５】本発明の弁装置を適用したサニタリー用の他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図６】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図７】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図８】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図９】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１０】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１１】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１２】従来例のサニタリー用継手を示す縦断面図であり、（ａ）は両継手が離間された状態を示し、（ｂ）は両継手が接続された状態を示す。
【図１３】従来例のサニタリー用継手の問題点の説明図である。
【符号の説明】
１継手
２弁枠体
３内部流体通路
３ａ第１接続口
３ｂ第２接続口
４スライド機構
５軸部材
６軸受
１０弁体
１１弁頭部
１２シール部
１２Ａ途中部分
１２Ｂ弁枠体側シール部分
１２Ｃ回り込み部分
１３弁頭部側ガイド
１４弁枠体側ガイド
１５移動部材
１５ａ段付部（追従機構）
２０変形規制部
２２、２３、２４段差部（追従機構）[0001]
BACKGROUND OF THE INVENTION
 The present invention relates to a valve device that is suitably used for connecting passages for fluids such as foods and medicines that require cleanliness, for example.
[0002]
[Prior art]
 As the valve device described above, for example, a sanitary joint is known. As shown in FIGS. 12A and 12B, this joint uses a female joint 101 having an internal fluid passage 102 and a male joint 111 having an internal fluid passage 112, and the internal fluid passages 102 and 112 are Each is connected to a separate fluid passage. The female joint 101 has a butting surface 101a at its upper end, the male joint 111 has a butting surface 111a at its lower end, and these both butting surfaces 101a and 111a are butted on the same axis. After the abutment, the valve body 103 provided in the female joint 101 is slid away from the valve seat 104, and the valve body 113 provided in the male joint 111 is slid away from the valve seat 114, whereby each internal fluid The connection state in which the passages 102 and 112 communicate with each other (the state shown in FIG. 12B) is established. On the contrary, when the valve body 103 is brought into contact with the valve seat 104 and the valve body 113 is brought into contact with the valve seat 114, the inner fluid passages 102 and 112 are cut off by separating the both butted surfaces 101a and 111a from each other. It will be in the separated state (the state of FIG. 12A).
[0003]
 The valve bodies 103 and 113 are slidably supported by shaft portions 105 and 115 provided respectively, and bearings 106 and 116 that support the shaft portions 105 and 115, respectively. A space between the provided flange 107 and the bearing 106 is covered with a flexible film 108, and a space between the flange 117 provided in the middle of the shaft portion 115 and the bearing 116 is covered with a flexible film 118. . When the internal fluid passages 102 and 112 are connected to each other, the flexible membranes 108 and 118 contain fluid to be transferred in a gap that is a sliding portion between the shaft portions 105 and 115 and the bearings 106 and 116. It is provided to prevent it from remaining.
[0004]
[Problems to be solved by the invention]
 By the way, as shown in FIG. 12 and FIG. 13 (showing the male joint 111 side), the flexible film 118 described above is between the one split shaft portion 115a obtained by dividing the shaft portion 115 into two and the flange 117. The other flexible shaft 108 is sandwiched and provided while being pressed by the other split shaft portion 115b, and the other flexible film 108 is provided in the same manner. The reason for adopting this configuration is that it is difficult to directly fix the end portion of the flexible film 108 or the like to the shaft portion, so that the shaft portion is divided and the space between them is used as the fixing portion.
[0005]
 Therefore, in the case of the conventional joint, since the joint X between the split shaft portion 115a and the flange 117 and the like is exposed to the internal fluid passage 112 and the like, the fluid to be transferred enters the joint X. There was a possibility of remaining, and there was room for improvement.
[0006]
 In addition, the valve bodies 103 and 113 are provided with ring-shaped contact members 103b and 113b that contact the valve seats 104 and 114 around the valve heads 103a and 113a at the distal ends. There is a gap forming portion formed between the contact portions 103b and 113b in the portions 103a and 113a, and there is a possibility that the fluid to be transferred enters and remains in the gap forming portion, and there is room for improvement.
[0007]
 The present invention has been made to solve the above-described problems of the prior art, eliminates the gap forming portion in the valve head, and simplifies the gap between the bearing and the portion supported thereby. It aims at providing the valve apparatus which can be shielded with a structure.
[0008]
[Means for Solving the Problems]
 ContractClaim1The valve device according to the invention includes a valve frame body in which a first connection port is provided at one end of the internal fluid passage and a second connection port at the other end, and the first connection port is provided inside the valve frame body. A shaft member that is slidable in the direction of contact with and away from the valve, a valve body attached to the tip of the shaft member, a bearing that slidably supports the middle of the shaft member, and sliding the shaft member And a valve head for bringing the first connection port into a valve-closed state by contacting the peripheral edge of the first connection port by sliding toward the first connection port of the shaft member. A seal portion extending from the valve head to the bearing side and having an end fixed so as to partition a sliding contact portion between the bearing and the shaft member from the internal fluid passage and deformed as the shaft member slides The seal portion and at least the surface layer portion of the valve head are integrally formed of synthetic resin. The internal fluid is allowed to flow at least in a valve-opened state between the boundary between the valve frame body and the shaft member and the valve frame side seal portion from the end portion fixed to the valve frame body to the middle portion in the seal portion. A ring-shaped valve frame side guide that is in contact with the valve frame side seal portion, and the valve frame side guide is moved by the slide of the valve frame body and the shaft member in a sliding direction thereof. It is supported so that it can bend and deform.
[0009]
 In this valve device, since the seal portion extending from the surface layer portion of the valve head to the bearing side and fixed to the end portion is integrally formed, the gap forming portion in the valve head can be eliminated. It becomes possible. Further, since the seal portion divides the sliding contact portion between the bearing and the shaft member from the internal fluid passage, the sliding contact portion between the bearing and the portion supported thereby is shielded. Furthermore, since the valve body has an integral structure with no gap on the whole and is formed in a bag shape, it is only necessary to fix the opening end of the seal part, and the number of fixing points can be reduced. It becomes a simple and simple structure. Further, a ring-shaped valve frame side guide is provided between the boundary portion between the valve frame body and the shaft member and the corresponding valve frame side seal portion, and the valve frame side guide is at least in a valve open state. Therefore, when the internal fluid is flowing, the contact with the valve frame side seal portion can be reduced, thereby reducing the pressure on the valve frame side seal portion and improving the durability of the seal portion. Further, since the valve frame body side guide is supported by the valve frame body and the moving member so as to be able to bend and deform, the valve frame body side seal portion can be used as the deforming portion.
[0010]
 Claim2The valve device according to the invention of claim1In the valve device according to claim 1, the valve frame supports the moving member while the shaft member slides from the closed state to the open state, and the moving member moves while the shaft member slides from the open state to the closed state. The shaft member is supported, and a moving member follow-up mechanism is provided that makes the moving member in a non-moving state between the time when the shaft member is supported by the valve frame body and the time when the shaft member is supported.
[0011]
 In this valve device, the moving member that supports the valve frame side guide has a shorter moving amount than the sliding amount of the shaft member, thereby making it possible to reduce the amount of bending of the valve frame side guide, The durability of the valve frame side guide can also be improved.
[0012]
 ContractClaim3The valve device according to the invention of claim1Or2In the valve device described in the above, the inner curved portion formed at a position closest to the end portion fixed to the valve frame body in the seal portion to the end portion is continuously located closer to the bearing side, and the end The valve frame side guide regulates the seal portion so that the portion is positioned closer to the first connection port than the bearing side portion of the second connection port.
[0013]
 In this valve device, the first connection port continuously extends from the bearing side portion of the second connection port to the inner curved portion formed at the position closest to the end of the seal portion fixed to the valve frame body. Since it is located on the side, this eliminates the formation of a recess that entrains the internal fluid flowing through the internal fluid passage. In addition, since there is no formation of the depression, it is possible to prevent a reduction in cleaning efficiency associated with the depression when performing valve cleaning.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
 Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0015]
 FIG. 1 is a longitudinal sectional view showing a sanitary joint to which the valve device of the present invention is applied, and shows a valve closed state. FIG. 2 is a longitudinal sectional view showing when the joint is in a valve open state, and FIG. 3 is a longitudinal sectional view showing both the valve opened state (left side) and the valve opened state (right side) of the joint.
[0016]
 The joint 1 includes a valve frame body 2 having an internal fluid passage 3, a shaft member 5 that is slid by a slide mechanism 4, and a bearing that supports a part of the shaft member 5 and constitutes a part of the valve frame body 2. 6 and a valve body 10 attached to the tip of the shaft member 5.
[0017]
 The valve frame body 2 is provided with a first connection port 3a at one end (upper side) of the internal fluid passage 3 and a second connection port 3b at the other end (right side). The first connection port 3a is detachably connected to another joint (not shown) connected to, for example, a transfer destination (or transfer source), and the second connection port 3b is connected to, for example, the transfer source (or transfer destination). ) Is connected to a pipe (not shown) such as a hose connected to.
[0018]
 The shaft member 5 is provided inside the valve frame body 2 and is slidable in a direction in which the shaft member 5 comes into contact with and separates from the first connection port 3a by a slide mechanism 4 provided on the base end side. The middle of the shaft member 5 is slidably supported by the bearing 6. For the slide mechanism 4, known means such as an air actuator, an electromagnet, or a manual handle is used.
[0019]
 On the outer side of the shaft member 5, a position closer to the base end side (lower side in the figure) than the tip end (upper end in the figure) to a position closer to the front end side than the part supported by the bearing 6. A deformation restricting portion 20 is provided integrally with the shaft member 5 therebetween. The deformation restricting portion 20 is formed to have a longer radius than the other portions of the shaft member 5, and the curved portion 21 whose outer peripheral surface is curved along the axial direction from the distal end side, and functions as a part of the follow-up mechanism 3. There are two step portions 22, 23, 24, and the outer diameters of the step portions 22, 23, 24 are set to be constant along the slide direction with different values. Specifically, the outer diameter of the stepped portion 22 is the smallest, the outer diameter of the stepped portion 24 is the largest, and the outer diameter of the stepped portion 23 is set between them. The deformation restricting portion 20 has a shape in which the outer peripheral surface has substantially the same diameter instead of the curved portion 21, or a shape in which the distal end side of the outer peripheral surface is gradually reduced or expanded in diameter than the base end side, or other Any outer peripheral surface shape can be used.
[0020]
 The valve body 10 is attached to the tip of the shaft member 5 as described above, and has a valve head 11 having a surface layer portion 11a and an attachment portion 11b, and extends from the surface layer portion 11a of the valve head 11 to the bearing 6 side. And a cylindrical seal portion 12 that is taken out. The attachment portion 11b is made of a metal or other inflexible material, and the tip portion of the shaft member 5 is screwed to the attachment portion 11b, and the entire surface layer portion 11a and the seal portion 12 are made of synthetic resin, for example, It is formed by integral molding with Teflon (PTFE: tetrafluoroethylene resin). When the valve head 11 moves to the advance limit position where the shaft member 5 contacts the peripheral edge 3c of the first connection port 3a by the approach slide to the first connection port 3a, the first connection port 3a is closed. (Refer to FIG. 1), the first connection port 3a is opened from the peripheral portion 3c of the first connection port 3a by the separation slide from the first connection port 3a of the shaft member 5 (see FIG. 2). . Here, the valve open state refers to a state in which the shaft member 5 is retracted to the retreat limit position by the separation slide.
[0021]
 A seal portion 12 extends from the maximum diameter portion 11c of the valve head 11 to the bearing 6 side and is formed in a bag shape. The base end side of the seal portion 12 is an open end. The entire circumference of the open end is fixed by being sandwiched between a part of the valve frame body 2 divided into a plurality and the boundary surface 2 a of the bearing 6. As a result, the seal portion 12 partitions the portion where the bearing 6 and the shaft member 5 are in sliding contact with each other from the internal fluid passage 3. In addition, it is preferable that the opening area of the valve frame 2 that fixes the seal portion 12 is substantially equal to the opening area of the first connection port 3a.
[0022]
 The outer peripheral portion 14a of the valve frame side guide 14 shown in FIG. 4B is also sandwiched between the boundary surface 2a. The valve frame side guide 14 regulates deformation of a valve frame side seal portion 12B described later (see FIG. 3), and is a circular ring shape made of an elastic material such as rubber, and has a cross-sectional shape inside. The peripheral side is formed in a substantially triangular shape, and the outer peripheral side is formed with a substantially constant thickness. The inner peripheral portion 14b having a substantially triangular cross section is formed between the stepped portion 22 and the concave notch 6b provided inside the boundary surface 2a of the valve frame body 2, that is, the deformation restricting portion 20 and the valve frame. It is disposed in a recess at the boundary portion of the body 2. A moving member 15 having a circular ring shape is disposed on the bearing 6 side of the valve frame side guide 14.
[0023]
 The moving member 15 has a stepped portion 15a that functions as a part of the follow-up mechanism in which the inner peripheral side of the lower end is notched (see FIG. 3), and moves in the slide direction by the slide of the shaft member 5. . Specifically, when the shaft member 5 is in the advanced limit position, the stepped portion 15a of the moving member 15 is engaged with the portion between the stepped portions 23 and 24, and the lower end is lifted from the notched portion 6b. It becomes. When the shaft member 5 is retracted from the state, the moving member 15 is lowered downward. When the shaft member 5 is lowered to a certain position, the lower end of the moving member 15 is engaged (contacted) with the notch 6b. become. Thereafter, even if the shaft member 25 is further slid to the retract limit position, the moving member 15 is restricted by the notch 6b and becomes non-moving. Further, when the front slide side is approached from the retreat limit position and the portion between the step portions 23 and 24 becomes higher than the bottom surface of the notch portion 6b, the stepped portion 15a of the moving member 15 is moved between the step portions 23 and 24. Then, the lower end is in a state of being lifted from the notch 6b. The following movement of the moving member 15 is repeated in the same manner as the shaft member 5 slides.
[0024]
 The valve frame side guide 14 can be deformed by the follow-up movement of the moving member 15. Specifically, in the valve closed state, as shown on the left side of FIGS. 1 and 3, the lower end side of the valve frame side guide 14 is engaged between the step portions 22 and 23, and the valve frame side guide 14 is elastic. Thus, it can be compressed and deformed, but it does not undergo shape deformation (flexure deformation). On the other hand, in the valve open state, as shown on the right side of FIGS. 2 and 3, the movement of the moving member 15 moves down between the step portions 22 and 23, and there is a gap below the valve frame side guide 14. Therefore, when the valve frame side guide 14 is pressed downward at the lower end portion of the seal portion 12 which is deformed when the valve is opened, the shape of the valve frame side guide 14 can be deformed to be bent downward.
[0025]
 A valve head side guide 13 shown in FIG. 4A is attached to the back side of the valve head 11 by adhesion or the like. The valve head side guide 13 regulates deformation of the wraparound portion 12C described later (see FIG. 3), and is a circular ring shape made of an elastic material such as rubber, for example, and the cross-sectional shape is on the inner peripheral side. The tip portion of the shaft member 5 is inserted inside the valve head side guide 13. The valve head side guide 13 may be formed integrally with the non-flexible mounting portion 11b.
[0026]
 The seal portion 12 is deformed as the shaft member 5 slides. In the present embodiment, the deformation of the seal portion 12 is halfway when the shaft member 5 (or the valve body 10) is in the closed state where the shaft member 5 (or the valve body 10) is in the advanced limit position (position shown in FIG. 1), as shown in FIG. The portion 12A (the portion excluding the wraparound portion 12C of the seal portion 12 and the valve frame side seal portion 12B) is in contact with the outer peripheral surface of the deformation restricting portion 20, substantially the curved portion 21, and the outer peripheral surface of the deformation restricting portion 20 Even if the shaft member 5 is in a valve open state where the shaft member 5 is in the retreat limit position (position shown in FIG. 2), that is, the outer peripheral surface of the deformation restricting portion 20 regardless of the valve open / closed state. It remains in contact and remains in a shape corresponding to the shape of its outer peripheral surface (however, a slight change in shape is accompanied by a change in the contact position with the deformation restricting portion 20). Further, the wraparound portion 12C that wraps around the back side of the valve head 11 of the seal portion 12 contacts the valve head side guide 13 when the valve is open, and corresponds to the outer peripheral surface of the valve head side guide 13. With this shape change, the entire region from the wraparound portion 12C to the midway portion 12A comes into contact with the deformation restricting portion 20, and the shape is in accordance with the shape of the outer peripheral surface of the deformation restricting portion 20. Then, as the shaft member 5 moves from the valve-opened state to the valve-closed state, the wraparound portion 12C moves away from the valve head side guide 13 while increasing the diameter away from the shaft center of the shaft member. Therefore, on the valve head 11 side of the seal portion 12, the boundary portion 12 E between the wraparound portion 12 C that contacts the valve head side guide 13 and the midway portion 12 A that contacts the deformation restricting portion 20 is curved and deformed. Further, the valve frame body side seal portion 12B from the end portion fixed at the boundary surface 2a of the seal portion 12 to the middle portion 12A is a valve whose shape can be deformed by the moving member 15 being lowered by the retraction of the shaft member 5. The frame side guide 14 is pressed downward. That is, the inner peripheral surface side of the valve frame side guide 14 is bent and deformed so as to be pressed downward, and comes into contact with a part of the outer peripheral surface of the valve frame side guide 14. And boundary part 12 of valve frame side seal part 12B and middle part 12AFThen, a gap is formed on the lower side, and a portion with the gap is curved. On the other hand, as the shaft member 5 moves from the valve-opened state to the valve-closed state, the valve frame body side seal portion 12B moves away from the bearing 6 while expanding the diameter away from the shaft center of the shaft member. Along with this, the valve frame side guide 14 that has been bent and deformed returns to its original state. In addition, in this paragraph, the pressure from the fluid does not act, that is, each part of the seal part 12 in a state before being connected to the pipe is explained.
[0027]
 That is, in the seal portion 12 of the present embodiment, the intermediate portion 12A is in contact with the deformation restricting portion 20 regardless of whether the valve is open or closed, and has a shape corresponding to the peripheral surface thereof. do not do. In contrast, the boundary portion 12E between the wraparound portion 12C and the midway portion 12A is curved and deformed, and the inclination of the wraparound portion 12C changes. Similarly, the boundary portion 12F between the valve frame side seal portion 12B and the midway portion 12A is curved and deformed, and the inclination of the valve frame side seal portion 12B changes. That is, both end sides on the end side of the middle portion 12A of the seal portion 12, particularly the boundary portion 12E between the wraparound portion 12C and the middle portion 12A, and the boundary portion 12 between the valve frame body side seal portion 12B and the middle portion 12A.F isIt functions as a deformation part. When the valve body 10 is in the retreat limit position (that is, in the valve open state), the seal portion 12 is continuously located closer to the bearing 6 side than the portion connected to the valve head portion 11a, and the valve head portion 11a. When the valve frame side guide 14 is in a valve open state (when no fluid pressure acts), the moving member 15 is designed as described above. It is designed so as to be in the above-described shape state even if a shape deformation that deflects downward occurs due to the movement of. As a matter of course, even when a fluid is flowed through the internal fluid passage 3, the shape state is maintained.
[0028]
 Therefore, in the joint 1 of the first embodiment, the valve body 10 extends from the valve head 11 to the bearing 6 side and is integrally formed up to the cylindrical seal portion 12 fixed to the valve frame body 2. Therefore, it is possible to eliminate the gap forming portion in the valve head 11 without using the ring-shaped contact members (103b, 113b) as in the prior art. Further, since the seal portion 12 partitions the portion where the bearing 6 and the shaft member 5 are in sliding contact with each other from the internal fluid passage 3, the portion where the bearing 6 and the shaft member 5 supported thereby can be shielded. Furthermore, since the valve body 10 has an integrated structure with no gap on the entire outer side and is formed in a bag shape, it is only necessary to fix the opening end portion on the proximal end side of the seal portion 12. It is possible to make a simple structure capable of reducing
[0029]
 In the first embodiment, in a valve open state in which a fluid flows by connecting to a pipe, that is, in a use state, the pressure acting on the intermediate portion 12A from the internal fluid flowing through the internal fluid passage 3 is restricted from deformation. It can be received by the portion 20, whereby the pressure received by the intermediate portion 12 A can be reduced, and the durability of the seal portion 12 can be improved. Further, a ring-shaped valve head side guide 13 is provided between the wraparound portion 12C of the seal portion 12 and the back surface side of the valve head portion 11a. Since the wraparound portion 12C is received, the pressure applied to the wraparound portion 12C can be reduced and the durability of the seal portion 12 can be improved. Furthermore, a ring-shaped valve frame side guide 14 is provided between the boundary portion between the valve frame 2 and the shaft member 5 and the corresponding valve frame side seal portion 12B, and the valve frame side guide 14 is opened. Since the valve frame body side seal portion 12B is received in the valve state, the pressure applied to the valve frame body side seal portion 14 can thereby be reduced and the durability of the seal portion 12 can be improved. In addition, since the valve frame body side guide 14 is supported by the valve frame body 2 and the moving member 15 so as to be able to bend and deform, the valve frame body side seal portion 12B can be used as a deforming portion.
[0030]
 In the present embodiment, when the valve is closed, the wraparound portion 12C of the seal portion 12 is separated from the valve head side guide 13, and when the valve is open, the valve frame side seal portion 12B is connected to the valve frame side guide 14. In other words, since the diameter of the wraparound portion 12C is increased and the valve head 11 is separated from the valve head 11, the valve frame body side seal portion 12B is separated from the bearing 6 while the diameter is increased. Is movable from the valve-opened state to the valve-closed state, and the enlargement degree of the diameter of the wraparound portion 12C and the valve frame side seal portion 12B accompanying the sliding of the shaft member 5 is the enlargement degree of the diameter at the intermediate portion 12A. Therefore, both end portions on the end side of the middle portion 12A of the seal portion 12 change in inclination as the shaft member 5 slides and function as a deformed portion of the seal portion 12. By the deformation of the seal portion 12 can be dispersed to both ends, the result diameter of the seal portion 12 can be suppressed to a small diameter as, thereby downsizing of the seal portion 12 can be reduced. Further, by dispersing the deformed portion of the seal portion 12 at both ends, the sliding amount of the shaft member 5 can be designed to be large.
[0031]
 In the above-described embodiment, when the valve is closed, the wraparound portion 12C of the seal portion 12 is separated from the valve head side guide 13. However, the present invention is not limited to this, and when the valve is closed, When the valve frame side seal portion 12B of the seal portion 12 is separated from the valve frame side guide 14, or when the valve is closed, the wraparound portion 12C of the seal portion 12 is separated from the valve head side guide 13 and the valve frame side. The seal portion 12B may be separated from the valve frame side guide 14. Further, the valve head side guide 13 may be movable in the same manner as the valve frame side guide 14 so that the wraparound portion 12C can be supported by the valve head side guide 13 when the valve is closed.
[0032]
 In the above-described embodiment, the wraparound portion 12C is brought into contact with the valve head side guide 13 by opening the valve (when the fluid pressure does not act), but the present invention is not limited to this. Absent. For example, when the shaft member 5 is set to various slide positions and the pipe is not connected to the valve device and is opened, the wraparound portion 12C does not contact the valve head side guide 13, and the pipe May be designed so that the wraparound portion 12C contacts the valve head side guide 13 when the valve device is connected to the valve device to open the valve, that is, at least when the pressure of the internal fluid is applied.
[0033]
 Further, in the above-described embodiment, the valve frame side seal portion 12B presses the valve frame side guide 14 to be bent and deformed by opening the valve (when the fluid pressure does not act). The present invention is not limited to this. For example, when the shaft member 5 is in various sliding positions and the valve is opened without connecting the pipe to the valve device, the valve frame side seal portion 12B does not contact the valve frame side guide 14, Designed so that the valve frame side seal portion 12B presses and deforms the valve frame side guide 14 when the pipe is connected to the valve device to open the valve, that is, at least when the pressure of the internal fluid acts. May be.
[0034]
 In the above-described embodiment, the intermediate portion 12A is in contact with the deformation restricting portion 20 regardless of whether the valve is open or closed (when the fluid pressure does not act), but the present invention is not limited to this. Absent. For example, when the shaft member 5 is set to various slide positions and the pipe is not connected to the valve device and is opened, the intermediate portion 12A does not contact the deformation restricting portion 20, and the pipe is connected to the valve device. When the valve is opened and connected, that is, at least when the pressure of the internal fluid is applied, the intermediate portion 12A may be designed to contact the deformation restricting portion 20.
[0035]
 In the embodiment described above, the deformation restricting portion 20 restricts the intermediate portion 12A, the valve frame side guide 14 the valve frame side seal portion 12B, and the valve head side guide 13 the flow portion 12C. However, the present invention is not limited to this. For example, in addition to the deformation restricting portion 20, at least one of the valve frame side guide 14 or the valve frame side seal portion 12B may be used. Even in such a configuration, the seal portion 12 is not torn even if it receives pressure from the fluid flowing through the internal fluid passage 3, so there is no need to separately provide a reinforcing film on the inside, and the seal portion 12 alone Sealing can be performed. The reason is that even if one of the valve frame side guide 14 or the valve head side guide 13 is omitted, most of the seal portion 12 can be received by the other guide and the deformation restricting portion 20, and the omitted guide receives. This is because the area of the seal portion 12 of the bag is small and is not easily broken. However, in the case of a valve device having a large area, the seal portion 12 is configured to include both the valve frame side guide 14 and the valve head side guide 13 in addition to the deformation restriction portion 20. This is preferable for preventing breakage. Further, when there is a possibility that the seal portion 12 is broken, a reinforcing film may be separately provided on a portion where the seal portion 12 may be broken or inside the entire area of the seal portion 12.
[0036]
 In the above-described embodiment, the deformation restricting portion 20 and the shaft member 5 are integrally configured. However, the present invention is not limited thereto, and the deformation restricting portion may be configured separately from the shaft member. Even in this case, the boundary between the deformation restricting portion and the shaft member is separated from the internal fluid passage 3 by the seal portion.
[0037]
 In the case of the present embodiment, since the seal portion is cylindrical, for example, a conical diaphragm valve (40 in the publication) disclosed in JP-A-10-205628 is used, or a special Compared to the case of using a valve (1 in the publication) having a conical diaphragm portion (2 in the publication) disclosed in Japanese Unexamined Patent Publication No. 2002-122253, there are the following advantages. That is, the above-mentioned Teflon has a very low elongation rate compared to rubber or the like. When such a synthetic resin is used and instead of the cylindrical seal portion, a substantially conical diaphragm whose diameter gradually increases from the valve head 11a side toward the bearing 6 side is formed as the seal portion, the shaft member 5 Therefore, a diaphragm having a diameter much larger than the pipe diameter is required to set the slide amount to a dimension corresponding to, for example, 25% of the pipe diameter.
[0038]
 Therefore, when the cylindrical seal portion is used as in the present embodiment, the expansion / contraction length can be made longer than that of the diaphragm having the same diameter. That is, by extending the cylindrical seal portion in the axial direction, the distance between the stretchable portions becomes long, and the stretchable length becomes long even when using a resin having a very low elongation rate such as Teflon. Therefore, it can be formed with a smaller diameter than the diaphragm. As shown in FIG. 5, when the intermediate portion 12A has a plurality of inwardly curved portions, in the illustrated example, two drum-shaped portions 12D, the extension / contraction length becomes longer.
[0039]
 In the case of a factory facility that recombines a natural flow pipeline, dozens of the above-described valve devices are collectively installed on the same plane. In such a factory facility, by using the cylindrical seal portion as in the present invention, the diameter can be made smaller than that in the case of using a diaphragm, so that the installation area of the factory facility can be reduced.
[0040]
 Further, by forming the seal portion in a cylindrical shape, it is possible to make the diameter of the cylindrical seal portion substantially the same diameter as the pipe diameter. Although it is conceivable that the diaphragm diameter is reduced by bending the diaphragm, it is not preferable because the bent portion of the diaphragm becomes concave and the internal fluid remains in that portion.
[0041]
 Since the valve device of the first embodiment uses a cylindrical seal portion, the valve device can be opened and closed without being bent, and is connected to the valve head 11a of the seal portion 12 as described above. From the portion to the end portion (lower end portion) fixed at the boundary surface 2a, the bearing 6 side is continuously located closer to the bearing 6 side, and the lower end portion is the second connection port as shown in FIGS. Is located closer to the first connection port 3a than the bearing-side portion, thereby preventing the formation of the concave portion and preventing the remaining of the internal fluid, thereby cleaning performance, that is, the ability to easily wash out the internal fluid, and The performance of reducing the residue of the cleaning fluid can be improved. However, the present invention can be applied not only to the cylindrical seal portion having the above-described advantages but also to a diaphragm-like seal portion in the case of a configuration including only the valve frame side guide. Of course.
[0042]
 Further, in the above-described embodiment, the cylindrical seal portion 12 is gently curved inward when the valve body is in the retreat limit position where the first connection port 3a is opened as the shaft member 5 moves apart. Although designed to be deformed, the present invention is not limited to this. For example, a part of the seal portion 12 in the axial center direction may be designed to bend and stretch in the shape of a cross-section “<” inward or outward. However, even in such a case, the bearing 6 side is continuously located closer to the bearing 6 side than the portion where the fluid is bent and stretched so that the fluid can hardly be accumulated and can be prevented from remaining, and the cleaning property is excellent. It is preferable to design so that it does.
[0043]
 In addition, when the seal portion is bent and stretched in the shape of a cross-section “<”, the seal portion is in the retreat limit position where the valve body is in the open state, that is, the inner angle of the bent portion is It is preferable that the dimensions of each part are determined when the size is minimized, and the dimensions of the mold are determined or determined when the mold is designed or cut. In this way, the bent part of the seal part does not generate internal stress when the valve body is in the retracted limit position, and prevents cracking or breakage due to stress concentration even if it undergoes repeated deformation. Because it can.
[0044]
 Alternatively, when the valve body is in the retreat limit position, that is, when the inner angle of the bent portion is minimum, the valve body is in the forward limit position where the first connection port 3a is closed, that is, the inner angle of the bent portion is maximum. It is preferable that the dimensions of each part are determined at an angle between and when the mold is designed or the dimensions at the time of cutting are determined to produce the seal part. In this way, the bent portion of the seal portion is repetitively deformed because the compression force is reduced when the valve body is in the retreat limit position and the tensile force is reduced when the valve body is in the advance limit position. This is because it is possible to more effectively prevent cracks or breakage due to stress concentration. In this case, the angles that determine the dimensions of each part may be determined empirically.
[0045]
 Further, in the above-described embodiment, the cylindrical seal portion 12 is used in which the middle portion 12A is gently curved inward, but the present invention is not limited to this. For example, as shown in FIGS. 5 to 10, in the valve open state, a seal portion having an outwardly curved portion in the middle portion 12 A and the valve frame side seal portion 12 B, or as shown in FIG. In the state, it is also possible to use a seal portion having a portion in which the valve frame side seal portion 12B side of the midway portion 12A is further curved inward. In the illustrated example, since only the deformation restricting portion 20 is provided on the shaft member 5, a reinforcing membrane 26 is provided inside the Teflon membrane 25 (corresponding to 12) as the seal portion 12. The configuration is provided separately. A portion 26a indicated by a broken line inside the film 26 is a reinforcing member such as cloth.
[0046]
 In the case of a seal portion having a plurality of drum-shaped portions 12D in the illustrated example as shown in FIG. 5 described above, the individual drum-shaped portions 12D are curved and deformed inward as described above, and the length of expansion and contraction becomes long. Therefore, it becomes possible to design the sliding amount of the shaft member 5 to be extremely large. Further, in the case of using the seal portion as shown in FIGS. 6 to 11, since at least a middle portion of the seal portion is restricted by the deformation restricting portion 20, the durability of the seal portion can be improved.
[0047]
 In the above-described embodiment, the valve frame side guide is provided with a moving member and a follow-up mechanism (steps 22 to 24, a stepped portion 15a, etc.) that bends and deforms the guide. Similar moving members and follow-up mechanisms may be provided not only on the guide side but also on the valve head side guide.
[0048]
 In the embodiment described above, the surface layer portion 11a of the valve head connected to the seal portion is formed of Teflon and the attachment portion 11b is formed of a different material. However, the present invention is not limited to this, and the valve head and the seal portion are not limited thereto. The entire portion may be formed of the same material such as Teflon.
[0049]
 In the above-described embodiment, Teflon is used as the synthetic resin for the valve body. However, the present invention is not limited to this, and a general synthetic resin having flexibility can also be used. Especially in the case of fluids such as foods and chemicals, Teflon, PFA (tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin) or FEP (tetrafluoroethylene / hexafluoropropylene copolymer resin) are excellent in chemical resistance. Etc.) are preferably used.
[0050]
 Moreover, although applied to the sanitary joint in the above-described embodiment, the present invention is not limited to this, and can be widely applied to other various joints or valves that perform opening and closing operations.
[0051]
【The invention's effect】
 As detailed above,BookClaims of the invention1In the valve device according to the present invention, a valve frame body in which a first connection port is provided at one end of the internal fluid passage and a second connection port is provided at the other end, and the first connection is provided inside the valve frame body. A shaft member that is slidable in a direction toward and away from the mouth, a valve body that is attached to a tip portion of the shaft member, a bearing that slidably supports the middle of the shaft member, and the shaft member And a valve head that closes the first connection port by contacting the peripheral edge of the first connection port by sliding closer to the first connection port of the shaft member. And a seal that extends from the valve head to the bearing side, has an end fixed so as to partition a sliding contact portion between the bearing and the shaft member from the internal fluid passage, and deforms as the shaft member slides And at least the surface layer portion of the valve head is integrated with a synthetic resin. Between the boundary portion between the valve frame body and the shaft member and the valve frame body side seal portion from the end portion fixed to the valve frame body to the middle portion in the seal portion. A ring-shaped valve frame side guide that is in contact with the valve frame side seal portion when flowing is provided, and the valve frame side guide moves in the sliding direction by sliding the valve frame body and the shaft member. Therefore, the following effects can be obtained. In other words, since a portion extending from the surface layer portion of the valve head to the bearing side and the seal portion to which the end portion is fixed is integrally formed, it is possible to eliminate a gap forming portion in the valve head. Further, since the seal portion divides the sliding contact portion between the bearing and the shaft member from the internal fluid passage, the sliding contact portion between the bearing and the portion supported thereby is shielded. Furthermore, since the valve body has an integral structure with no gap on the whole and is formed in a bag shape, it is only necessary to fix the opening end of the seal part, and the number of fixing points can be reduced. It becomes a simple and simple structure. Further, a ring-shaped valve frame side guide is provided between the boundary portion between the valve frame body and the shaft member and the corresponding valve frame side seal portion, and the valve frame side guide is at least in a valve open state. Therefore, when the internal fluid is flowing, the contact with the valve frame side seal portion can be reduced, thereby reducing the pressure on the valve frame side seal portion and improving the durability of the seal portion. Further, since the valve frame body side guide is supported by the valve frame body and the moving member so as to be able to bend and deform, the valve frame body side seal portion can be used as the deforming portion..
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a sanitary joint to which a valve device of the present invention is applied, showing a valve closed state.
FIG. 2 is a longitudinal sectional view showing when the joint of FIG. 1 is in a valve open state.
3 is a longitudinal sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) of the joint of FIG. 1;
4A is a longitudinal sectional view showing a valve head side guide provided in the joint of FIG. 1, and FIG. 4B is a longitudinal sectional view showing the valve frame side guide.
FIG. 5 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in another sanitary joint to which the valve device of the present invention is applied.
FIG. 6 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in still another sanitary joint to which the valve device of the present invention is applied.
FIG. 7 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in still another sanitary joint to which the valve device of the present invention is applied.
FIG. 8 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in yet another sanitary joint to which the valve device of the present invention is applied.
FIG. 9 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in still another sanitary joint to which the valve device of the present invention is applied.
FIG. 10 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in still another sanitary joint to which the valve device of the present invention is applied.
FIG. 11 is a cross-sectional view showing a valve closing state (left side in the figure) and a valve opening state (right side in the figure) in still another sanitary joint to which the valve device of the present invention is applied.
12A and 12B are longitudinal sectional views showing a conventional sanitary joint, in which FIG. 12A shows a state in which both joints are separated from each other, and FIG. 12B shows a state in which both joints are connected.
FIG. 13 is an explanatory diagram of problems of a conventional sanitary joint.
[Explanation of symbols]
 1 Fitting
 2 Valve frame
 3 Internal fluid passage
 3a 1st connection port
 3b Second connection port
 4 Slide mechanism
 5 shaft members
 6 Bearing
 10 Disc
 11 Valve head
 12 Sealing part
 12A halfway part
 12B Valve frame side seal part
 12C wraparound part
 13 Valve head side guide
 14 Valve frame side guide
 15 Moving member
 15a Stepped part (follow-up mechanism)
 20 Deformation restriction part
 22, 23, 24 Step part (follow-up mechanism)

Claims

In a direction in which the first connection port is provided at one end of the internal fluid passage and the second connection port is provided at the other end, and the inside of the valve frame body is in contact with and away from the first connection port. A shaft member provided so as to be slidable, a valve body attached to a tip portion of the shaft member, a bearing that slidably supports the middle of the shaft member, and a slide mechanism that slides the shaft member;
The valve body includes a valve head that contacts the peripheral edge of the first connection port by sliding toward the first connection port of the shaft member to close the first connection port, and a bearing from the valve head. A seal portion extending to the side and having an end fixed so as to partition a sliding contact portion between the bearing and the shaft member from the internal fluid passage and deformed as the shaft member slides. And at least the surface layer portion of the valve head are integrally formed of a synthetic resin, the boundary portion between the valve frame body and the shaft member, and the valve from the end portion fixed to the valve frame body to the middle portion in the seal portion A ring-shaped valve frame side guide that comes into contact with the valve frame side seal portion when the internal fluid is flowing at least in a valve open state is provided between the frame side seal portion and the valve frame side guide. The valve frame and the moving member that moves in the sliding direction by sliding the shaft member Valve apparatus characterized by being deformably supported deflection.

The valve device according to claim 1 ,
The shaft frame supports the moving member from the middle while the shaft member slides from the closed state to the open state, and the shaft member supports the moving member from the middle while the shaft member slides from the open state to the closed state. A valve device comprising a moving member follow-up mechanism that moves the moving member in a non-moving state between the time when it is supported by the valve frame and the time when it is supported by the shaft member.

The valve device according to claim 1 or 2 ,
The inner curved portion formed at a position closest to the end portion fixed to the valve frame body in the seal portion to the end portion is continuously located closer to the bearing side, and the end portion is the second connection port. The valve device, wherein the valve frame side guide regulates the seal portion so as to be positioned closer to the first connection port than the bearing side portion.