JP4163889B2

JP4163889B2 - Pressure control valve with upper / lower pressure cutoff mechanism

Info

Publication number: JP4163889B2
Application number: JP2002100044A
Authority: JP
Inventors: 直人高橋
Original assignee: ITO KOKI CO., LTD.
Current assignee: ITO KOKI CO., LTD.
Priority date: 2002-04-02
Filing date: 2002-04-02
Publication date: 2008-10-08
Anticipated expiration: 2022-04-02
Also published as: JP2003295955A

Description

【０００１】
【発明の属する技術分野】
この発明は、圧力調整弁の二次側の圧力が異常に変動した場合に作動する上・下限圧遮断機構付き圧力調整弁に関する。
【０００２】
【従来の技術】
圧力調整弁の二次側圧力が規定値より高く、または低くなった場合に作動する遮断弁（ＯＰＳＯ＝Over Pressure Shut Off、ＵＰＳＯ＝Under Pressure Shut Off ）として、これまで使用されてきたものとして、図１０（ａ）に示すように圧力調整弁Ｘと遮断弁Ｚとが直列に配置され、遮断弁Ｚのダイヤフラム室４１に圧力調整弁Ｘの二次圧を導入し、二次圧が異常に高くなったときにダイヤフラム４２が変位して連動子４３が後退してスピンドル４５の切り込み４６が外れ、スプリング４７の付勢により弁体４４が弁座４８に当接して流路を遮断するものがある。なお、スピンドル４５の上端にはリセット用の摘まみ４９があり、この摘まみを引き上げることによりリセットされる。
【０００３】
また、図１０（ｂ）に示すＯＰＳＯとＵＰＳＯ兼用の従来例は、ダイヤフラム４２と一体の連動子４３の下端には内面に環状リブ４３a を形成した筒体４３b が一体に形成されている。
【０００４】
一方、下端に弁体４４を取付けたスピンドル４５には括れ４５a が形成されて、この括れ４５a と上記筒体４３b の環状リブ４３a との間に複数個のボールＢが介在し、上記環状リブ４３a の上下は懐が広くなってボールＢが遊ぶようになっている。
【０００５】
図の状態では環状リブ４３a とスピンドル４５の括れ４５a との間にボールＢが介在しているのでスピンドル４５は下降しない。
【０００６】
ここで、二次圧が規定圧より高く、または低くなるとダイヤフラム４２は上、または下に変位し、ボールＢは環状リブ４３a から外れ、筒体４３b の上、または下の懐に入りスピンドル４５の括れ４５a から外れ、スピンドル４５はスプリング４７の付勢により下降し弁体４４と弁座４８とが当接して流路が遮断される。なお、弁座４８の中心下方にはロッドＰが延び、その下端にノブＮが設けられてリセット機構を構成している。
【０００７】
また、本発明者は図９に示す「遮断弁付き圧力調整弁」を提案した。この提案はダイヤフラム室３１に導入された二次圧が異常上昇したときの、ダイヤフラム０３の初動変位で、弁体１３と弁座１４とからなるパイロット弁０８が開き、一次圧ガスをダイヤフラム室３１に導入してダイヤフラム０３を大きく変位させ、Ｏリング１１aなどの抵抗に関わりなくストッパーＳが引き上げて確実に遮断弁１６が作動するようにしたものである。
【０００８】
【発明が解決しようとする課題】
しかしながら、上記提案では、二次圧の異常上昇には対応できるが、異常低下には対応できないという問題が残っている。
【０００９】
本発明は上記従来技術の問題に鑑み、応答性が良く、構造が小型・簡単で確実に作動する上・下限圧遮断機構付き圧力調整弁（ＯＰＳＯ＆ＵＰＳＯ）を提供することを課題とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するために本発明は、圧力調整弁の二次圧を上・下限圧検出ダイヤフラム室に導入し、上記二次圧が正常なときは遮断弁の作動を阻止し、上・下限圧を超えたときは遮断弁を作動させるようにしてなる上・下限圧遮断機構付き圧力調整弁において、一次圧ガス流路に対して上限圧検出部と下限圧検出部を設け、上限圧検出ダイヤフラム室に向けて、一次圧ガス流路からパイロット弁を介在させた流路を開き、下限圧検出部には、そのダイヤフラムの変位を受けて上限圧検出ダイヤフラム室に一次圧ガスが流入するようにしてなり、上記下限圧検出部の弁棒は、一次圧ガス流路を経て上限圧検出ダイヤフラム室に向けて貫通し、同ダイヤフラム室内で一次圧ガス流通弁を構成するか、上記下限圧検出部のダイヤフラムの変位を、直接または間接にスライドバルブに伝えて、一次圧ガス流路から上限圧検出ダイヤフラム室に流路を開くようにしたものである。
【００１１】
また、上記パイロット弁は、ダイヤフラムと共動する連動子の下端面に設けた弁体と、ダイヤフラムケース下部中心の貫通孔に差し込まれた中空スピンドルの上部枠体内に形成された弁座とからなり、上記連動子と枠体とは遊びを以て連結されており、その連結は、枠体に開けられた長孔と連動子に植設されたピンにより、または、上端を縮径した筒体である枠体と連動子の下端に形成した鍔とにより遊びを以て連結される構成とし、上記遮断弁は、一次圧ガス流路中に、バネ座とこのバネ座に装填されたスプリングと、このスプリングにより弁座に向けて付勢される遮断弁体と、本体内に形成した弁座とからなる構成としたものである。
【００１２】
上記の如く構成するこの発明によれば、二次圧の異常上昇に対しては、上限圧検出ダイヤフラムの初動でパイロット弁が開き、その後は、パイロット弁を経て一次圧ガスがダイヤフラム室に導入され、Ｏリングなどの抵抗に関わりなくストッパーが引き上げられて確実に遮断弁が作動する。
【００１３】
また、二次圧の異常低下に対しては、下限圧検出ダイヤフラムの変位により上限圧検出ダイヤフラム室内に一次圧ガスが流入してＯリングなどの抵抗に関わりなくストッパーが引き上げられて確実に遮断弁が作動するようになる。
【００１４】
【発明の実施の形態】
次に、本発明の実施形態を図面を参照しながら説明する。図１は本発明の第一実施形態に係るもので、圧力調整弁Ｘと上・下限圧遮断機構とからなり、圧力調整弁Ｘは、ダイヤフラム室３１とダイヤフラム３２と連動子３３とレバー３４と弁体３５とノズル３６とからなる公知のものであり、上・下限圧遮断機構は、上限圧検出部Ｏと下限圧検出部Ｕと遮断弁１６とからなっている。
【００１５】
上限圧検出部Ｏは、図１，図２，図６（ａ）（ｂ）に示すようにケース４０とカバー０２とダイヤフラム０３と受圧板０５とスプリング２８ｏとからなるダイヤフラム機構０１と、ダイヤフラム０３と一体でピン１２を植設した連動子０４と上部に枠体１０を有し上記ピン１２と長孔０９とでダイヤフラム０３の変位方向の遊びをもって連結し先端を縮径０６した中空のスピンドル１５、弁体１３と弁座（ノズル）１４とからなるパイロット弁０８とで構成している。
【００１６】
なお、上記連動子０４と上部に枠体１０を有するスピンドル１５とを遊びを以て連結する構造を、図６（ｃ）のように枠体１０の上部を縮径１０b した筒体１０a とし、この筒体１０a に嵌まる連動子０４の外周に鍔１２a を形成して連結することもできる。
【００１７】
下限圧検出部Ｕは、図１、図２に示すようにケース５０とカバー５２とダイヤフラム５３と受圧板５５とスプリング２８uとからなるダイヤフラム機構５１と、ダイヤフラム５３と一体の連動子５４から一次圧ガス流路Ｌを経て上限圧検出ダイヤフラム室Ｒｏに貫通した弁棒５６の先端に設けられた一次圧ガス流通弁５７とで構成している。その弁棒５６が一次圧ガス流路Ｌを経て上限圧検出ダイヤフラム室Ｒｏに貫通していることにより、流通弁５７が開くことによってその貫通孔を介して一次圧ガス流路Ｌから上限圧検出ダイヤフラム室Ｒｏに一次圧ガスが流入する。なお、５８はＯリング５９を内包するグランド、
６０は一次圧ガス流通弁５７を弁座６１に向けて付勢するスプリングである。
【００１８】
一次圧ガス流路Ｌの遮断機構Ｙを成す上記遮断弁１６は、図１、図６（ａ）、（ｂ）に示すように本体１８の内部後端に環状のバネ座２０を設け、このバネ座２０にスプリング２２を装填し、このスプリング２２でロッド１７の両端に鍔２３を形成しＯリング２４を嵌めた遮断弁体２１を弁座Ｑに向けて付勢するように構成している。
【００１９】
次に上記実施形態の作用について説明する。圧力調整弁の二次圧Ｐ₂が正常のときは、上限圧検知ダイヤフラム０３は正常位置を保っており、異常上昇するとダイヤフラムと一体の連動子０４は長孔０９とピン１２とのギャップの範囲内で抵抗なく上昇する。
【００２０】
連動子０４が上昇すると、その下端に嵌められたゴム製の弁体１３も上昇し、弁体１３と弁座（ノズル）１４とで構成するパイロット弁０８が開き上限圧検出ダイヤフラム室Ｒ_Oに一次圧ガスが流入しダイヤフラム０３は大きく変位してピン１２は長孔０９の上端に当接してスピンドル１５、即ちストッパーＳがＯリングの抵抗に関わりなく引き上げられ縮径０６部の先端は遮断弁１６の移動阻止機能を失い一次圧ガス流路が遮断される。
【００２１】
二次圧Ｐ₂の異常上昇時の上限圧検出部Ｏの作用を図７を参照しながら、さらに詳しく説明する。
【００２２】
図７（ａ）は二次圧Ｐ₂が正常状態でダイヤフラム室Ｒ_O内は二次圧ガスで充満している。
【００２３】
二次圧Ｐ₂が異常上昇すると図７（ｂ）のごとくダイヤフラム０３が若干上昇する。このとき、長孔０９とピン１２にギャップがあるのでＯリングの摩擦抵抗に影響されずに連動子０４と共にゴム製弁体１３が上昇し、弁座１４（ノズル）とで構成しているパイロット弁が開きダイヤフラム室Ｒ_O内に一次圧ガスが流入しはじめる。
【００２４】
図７（ｃ）は一次圧ガスがダイヤフラム室Ｒ_O内に流入してダイヤフラム０３が大きく上昇し、図７（ｄ）では遂にスピンドル１５（ストッパー）が大きく上昇して遮断弁１６が作動し一次圧ガスの流路を遮断する。
【００２５】
図７（ｄ）の状態から一定時間経過するとダイヤフラム室Ｒ_O内のガスは微小孔ｈから流出して図７（ｅ）の状態（リリーフの吹き止まり圧）になる。
【００２６】
図２に戻って、圧力調整弁の二次圧Ｐ₂が異常低下するとダイヤフラム５３と一体の連動子５４は上方向に変位し、弁棒５６が上昇して一次圧ガス流通弁５７が開き、一次圧ガスがダイヤフラム室Ｒ_Oに流入してダイヤフラム０３が上昇してストッパーＳ（図６参照）が引き上げられて遮断弁１６が右に移動して一次圧ガス流路が遮断される。
【００２７】
図３は第二実施形態で、第一実施形態との違いは圧力調整弁Ｘと遮断機構Ｙと上・下限圧検出部Ｏ，Ｕの配置だけで他は同じであるから説明を省略する。
【００２８】
図４は、第三実施形態で第二実施形態と殆ど同じであるから、相違するところだけ説明する。下限圧検出部Ｕから延びる弁棒５６は一次圧ガス流路Ｌを貫通せず上限圧検知部のダイヤフラム室Ｒ_O内に至り一次圧ガス流通弁５７の弁軸６６を引き上げるようになり、ケースから突き出たブラケット６７と弁体６８との間にスプリング６９が介在し、一次圧ガス流路Ｌとダイヤフラム室Ｒ_Oとが連通している。
【００２９】
圧力調整弁の二次圧が異常低下するとダイヤフラム５３とともに弁棒５６が上昇し、一次圧ガス流通弁５７の弁軸６６を引き上げて、一次圧ガスがダイヤフラム室Ｒ_Oに流入し遮断弁１６が閉じる。
【００３０】
図５は第四実施形態で、下限圧検出部Ｕのダイヤフラム５３と一体の連動子５４には長孔６２でレバー６３がリンクし、レバー６３の作用点にはスライドバルブ６４がリンクしている。
【００３１】
スライドバルブ６４は一次圧ガス流路Ｌからダイヤフラム室Ｒ_Oに至る流路６５の一部に装填されてダイヤフラムの変位により流路６５が開閉されるようになっている。
【００３２】
圧力調整弁の二次圧が異常低下するとダイヤフラム５３とともにレバー６３が揺動し、作用点にリンクしたスライドバルブ６４が下がり流路６５が開いて、一次圧ガスがダイヤフラム室Ｒ_Oに流入し遮断弁１６を閉じる。
【００３３】
図８は、上記各実施形態が高い一次圧力下で使用される場合に、遮断弁の誤動作を防止する機構を付加したもので、スピンドル１５の下端にバネ座３７を形成し、このバネ座３７にスプリング３８を装填し、ケース４０の基部に袋ナット３９を螺合してスピンドル１５を下方に付勢する構造となっている。
【００３４】
この機構を付加することにより、高い一次圧力によってＯリング１１aが押し上げられて遮断弁１６が誤動作するのを防止できる。すなわち、スプリング３８でスピンドル１５を遮断弁１６を非作動とする方向に付勢することによって、二次圧正常状態におけるスピンドル１５の変位による遮断弁１６の誤作動を防止する。
【００３５】
【発明の効果】
以上説明した通りこの発明によれば、二次圧が異常上昇または異常低下したときに素早く応答し、確実に遮断弁が作動し、さらに一次圧が異常圧になったときにも遮断弁が確実に閉じる。
【図面の簡単な説明】
【図１】第一実施形態の縦断面図
【図２】図１の部分拡大図
【図３】第二実施形態の水平面図
【図４】（ａ）第三実施形態の縦断面図
（ｂ）図４（ａ）のＡ−Ａ断面図
【図５】第四実施形態の縦断面図
【図６】（ａ）ダイヤフラム室と遮断弁の部分図
（ｂ）連動子とストッパーとの連結部詳細図
（ｃ）他の連動子とストッパーとの連結部詳細図
【図７】上限圧検出部の作用説明図
【図８】一次圧異常上昇時遮断機構図
【図９】先行技術説明図
【図１０】（ａ）従来のＯＰＳＯ付き圧力調整弁の縦断面図
（ｂ）従来のＯＰＳＯ、ＵＰＳＯ付き圧力調整弁の遮断弁部分縦断面図
【符号の説明】
０１，５１ダイヤフラム機構
０２，５２カバー
０３，５３ダイヤフラム
０４，５４連動子
０５，５５受圧板
０６縮径
０７貫通孔
０８パイロット弁
０９長孔
１０枠体
１１，１１a ，１１b ，２４，５９Ｏリング
１２ピン
１３，６８弁体
１４弁座（ノズル）
１５，４５スピンドル
１６遮断弁
１７ロッド
１８本体
１９ストレーナ
２０，３７バネ座
２１遮断弁体
２２，２８o ，２８u ，４７，６０，６９スプリング
２３鍔
２５リセット機構
２６筒体（リセット機構の）
２７リセット棒
２９キャップ
３１ダイヤフラム室
３２，４２ダイヤフラム
３３，４３連動子
３４レバー
３５，４４弁体
３６ノズル
３８スプリング
３９袋ナット
４０ケース
４１ダイヤフラム室
４３a 環状リブ
４３b 筒体
４５a 括れ
４６切り込み
４８，６１弁座
４９摘まみ
５０ケース
５６弁棒
５７一次圧流通弁
５８グランド
６２長孔
６３レバー
６４スライドバルブ
６５流路
６６弁軸
６７ブラケット
６８
Ｂボール
Ｌ一次圧ガス流路
Ｎノブ
Ｏ上限圧検出部
Ｐロッド
Ｑ弁座
Ｒ_O ダイヤフラム室（上限圧検出用）
Ｒ_U ダイヤフラム室（下限圧検出用）
Ｓストッパー
Ｕ下限圧検出部
Ｘ圧力調整弁
Ｙ遮断機構
Ｚ遮断弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure regulating valve with an upper / lower limit pressure shut-off mechanism that operates when the pressure on the secondary side of the pressure regulating valve fluctuates abnormally.
[0002]
[Prior art]
As a shutoff valve (OPSO = Over Pressure Shut Off, UPSO = Under Pressure Shut Off) that operates when the secondary pressure of the pressure regulating valve is higher or lower than the specified value, As shown in FIG. 10A, the pressure regulating valve X and the shutoff valve Z are arranged in series, and the secondary pressure of the pressure regulating valve X is introduced into the diaphragm chamber 41 of the shutoff valve Z, and the secondary pressure becomes abnormal. When the height is increased, the diaphragm 42 is displaced, the interlock 43 is moved backward, the notch 46 of the spindle 45 is released, and the valve body 44 comes into contact with the valve seat 48 by the urging of the spring 47 to block the flow path. is there. A reset knob 49 is provided at the upper end of the spindle 45 and is reset by pulling up the knob.
[0003]
Further, in the conventional example for both OPSO and UPSO shown in FIG. 10B, a cylindrical body 43b having an annular rib 43a formed on the inner surface is integrally formed at the lower end of the interlock 43 integrated with the diaphragm.
[0004]
On the other hand, a constriction 45a is formed on the spindle 45 with the valve body 44 attached to the lower end, and a plurality of balls B are interposed between the constriction 45a and the annular rib 43a of the cylindrical body 43b, and the annular rib 43a. The upper and lower sides of the ball become wider and the ball B plays.
[0005]
In the state shown in the figure, since the ball B is interposed between the annular rib 43a and the constriction 45a of the spindle 45, the spindle 45 does not descend.
[0006]
Here, when the secondary pressure is higher or lower than the specified pressure, the diaphragm 42 is displaced upward or downward, and the ball B is disengaged from the annular rib 43a, enters the pocket above or below the cylindrical body 43b, and enters the spindle 45. The spindle 45 is removed from the constriction 45a, and the valve body 44 and the valve seat 48 are brought into contact with each other by the urging of the spring 47, thereby blocking the flow path. A rod P extends below the center of the valve seat 48, and a knob N is provided at the lower end thereof to constitute a reset mechanism.
[0007]
The inventor has also proposed a “pressure regulating valve with a shut-off valve” shown in FIG . This proposal is based on the initial displacement of the diaphragm 03 when the secondary pressure introduced into the diaphragm chamber 31 abnormally rises, and the pilot valve 08 comprising the valve body 13 and the valve seat 14 opens, and the primary pressure gas is supplied to the diaphragm chamber 31. The diaphragm 03 is largely displaced so that the stopper S is pulled up regardless of the resistance of the O-ring 11a and the shut-off valve 16 is reliably operated.
[0008]
[Problems to be solved by the invention]
However, the above proposal can cope with an abnormal increase in secondary pressure, but cannot cope with an abnormal decrease.
[0009]
An object of the present invention is to provide a pressure regulating valve (OPSO & UPSO) with upper / lower pressure shut-off mechanisms that has good responsiveness, is small in size, simple in structure, and operates reliably.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention introduces the secondary pressure of the pressure regulating valve into the upper / lower pressure detection diaphragm chamber, and when the secondary pressure is normal, the operation of the shut-off valve is prevented, In the pressure control valve with upper / lower pressure shut-off mechanism that activates the shut-off valve when the pressure exceeds the pressure, an upper limit pressure detection unit and a lower limit pressure detection unit are provided for the primary pressure gas flow path to detect the upper limit pressure. Open the flow path with the pilot valve interposed from the primary pressure gas flow path toward the diaphragm chamber, so that the primary pressure gas flows into the upper limit pressure detection diaphragm chamber in response to the displacement of the diaphragm in the lower pressure detection section. The valve rod of the lower limit pressure detection section passes through the primary pressure gas flow path toward the upper limit pressure detection diaphragm chamber, and constitutes a primary pressure gas flow valve in the diaphragm chamber, or the lower limit pressure detection The displacement of the diaphragm Tell contact or indirectly to the slide valve, in which to open a flow path diaphragm chamber exit upper pressure from the primary pressure gas passage.
[0011]
The pilot valve is composed of a valve body provided on the lower end surface of the interlocking member cooperating with the diaphragm, and a valve seat formed in the upper frame body of the hollow spindle inserted into the through hole at the lower center of the diaphragm case. The interlock and the frame are connected with play, and the connection is a long hole opened in the frame and a pin implanted in the interlock, or a cylinder whose upper end is reduced in diameter. The shut-off valve is connected to the frame body and a hook formed at the lower end of the interlock member, and the shut-off valve includes a spring seat, a spring loaded in the spring seat, and a spring in the primary pressure gas flow path. A shut-off valve body that is biased toward the valve seat and a valve seat formed in the main body are used.
[0012]
According to the present invention configured as described above, when the secondary pressure is abnormally increased, the pilot valve is opened by the initial operation of the upper limit pressure detection diaphragm, and thereafter, the primary pressure gas is introduced into the diaphragm chamber via the pilot valve. The stopper is pulled up regardless of the resistance of the O-ring, etc., and the shut-off valve operates reliably.
[0013]
In addition, when the secondary pressure drops abnormally, the displacement of the lower pressure detection diaphragm causes the primary pressure gas to flow into the upper pressure detection diaphragm chamber and the stopper is lifted regardless of the resistance of the O-ring, etc. Will be activated.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1, there is according to a first embodiment of the present invention consists of a pressure regulating valve X and the upper and lower limit pressure cutoff Organization, the pressure regulating valve X is diaphragm chamber 31 and the diaphragm 32 and Rendoko 33 and the lever 34 The upper / lower pressure cutoff mechanism is composed of an upper limit pressure detection unit O, a lower limit pressure detection unit U, and a cutoff valve 16.
[0015]
The upper limit pressure detection unit O includes a diaphragm mechanism 01 including a case 40, a cover 02, a diaphragm 03, a pressure receiving plate 05, and a spring 28o, and a diaphragm 03 as shown in FIGS. A hollow spindle 15 having an interlocking element 04 in which a pin 12 is implanted integrally and a frame body 10 at the upper part and connected with play in the displacement direction of the diaphragm 03 by the pin 12 and a long hole 09, and a tip having a reduced diameter 06. The pilot valve 08 includes a valve body 13 and a valve seat (nozzle) 14.
[0016]
In addition, the structure which connects the said interlocking member 04 and the spindle 15 which has the frame 10 in the upper part with play is made into the cylinder 10a which reduced the diameter 10b to the upper part of the frame 10, as shown in FIG.6 (c), and this cylinder. It is also possible to form a flange 12a on the outer periphery of the interlocking member 04 fitted into the body 10a.
[0017]
As shown in FIGS. 1 and 2, the lower limit pressure detection unit U includes a diaphragm mechanism 51 including a case 50, a cover 52, a diaphragm 53, a pressure receiving plate 55, and a spring 28 u, and a primary pressure from an interlocking member 54 integral with the diaphragm 53. A primary pressure gas flow valve 57 provided at the tip of a valve rod 56 that penetrates the upper limit pressure detection diaphragm chamber Ro through the gas flow path L is constituted. When the valve rod 56 passes through the primary pressure gas flow path L to the upper limit pressure detection diaphragm chamber Ro, the upper limit pressure is detected from the primary pressure gas flow path L through the through hole when the flow valve 57 is opened. The primary pressure gas flows into the diaphragm chamber Ro. In addition, 58 is a ground containing the O-ring 59,
A spring 60 biases the primary pressure gas flow valve 57 toward the valve seat 61.
[0018]
The shutoff valve 16 constituting the shutoff mechanism Y of the primary pressure gas flow path L is provided with an annular spring seat 20 at the inner rear end of the main body 18 as shown in FIGS. The spring 22 is loaded with the spring 22, and the spring 22 is configured to urge the shut-off valve body 21 with the flanges 23 formed at both ends of the rod 17 and the O-ring 24 fitted toward the valve seat Q. .
[0019]
Next, the operation of the above embodiment will be described. When secondary pressure P ₂ of the pressure regulating valve is normal, the upper limit pressure detecting diaphragm 03 is maintained normal position, when the abnormal rise Rendoko 04 of the diaphragm and the integral range of the gap between the elongated hole 09 and the pin 12 Rises without resistance.
[0020]
When the interlock 04 rises, the rubber valve body 13 fitted to the lower end thereof also rises, and the pilot valve 08 constituted by the valve body 13 and the valve seat (nozzle) 14 opens to enter the upper limit pressure detection diaphragm chamber R _O. The primary pressure gas flows in, the diaphragm 03 is greatly displaced, the pin 12 comes into contact with the upper end of the long hole 09, the spindle 15, that is, the stopper S is pulled up regardless of the resistance of the O-ring, and the tip of the reduced diameter 06 part is the shut-off valve. The primary pressure gas flow path is blocked by losing the 16 movement prevention function.
[0021]
The operation of the upper limit pressure detection unit O when the secondary pressure P ₂ is abnormally increased will be described in more detail with reference to FIG.
[0022]
FIG. 7A shows that the secondary pressure P ₂ is normal and the diaphragm chamber R _O is filled with the secondary pressure gas.
[0023]
When the secondary pressure P ₂ rises abnormally, the diaphragm 03 slightly rises as shown in FIG. At this time, since there is a gap between the long hole 09 and the pin 12, the rubber valve body 13 rises together with the interlock member 04 without being affected by the frictional resistance of the O-ring, and the pilot constituted by the valve seat 14 (nozzle). valve primary pressure gas to open the diaphragm chamber R _O starts to flow.
[0024]
FIG. 7 (c) significantly increased the diaphragm 03 and flows primary pressure gas within the diaphragm chamber R _O, FIG. 7 (d) in finally spindle 15 (stopper) is greatly increased shutoff valve 16 is operated scratch primary Shut off the pressure gas flow path.
[0025]
When a predetermined time has elapsed from the state of FIG. 7D, the gas in the diaphragm chamber R _O flows out of the minute hole h and becomes the state of FIG. 7E (relief blow-off pressure).
[0026]
Returning to FIG. 2, when the secondary pressure P ₂ of the pressure regulating valve is abnormally lowered, the interlock 54 integrated with the diaphragm 53 is displaced upward, the valve stem 56 is raised, and the primary pressure gas flow valve 57 is opened. primary pressure gas diaphragm 03 flows into the diaphragm chamber R _O is interrupted by the stopper S (see FIG. 6) primary pressure gas flow path to move to the right shutoff valve 16 is pulled up to rise.
[0027]
FIG. 3 shows a second embodiment. The difference from the first embodiment is the same as the first embodiment except for the arrangement of the pressure regulating valve X, the shut-off mechanism Y, and the upper / lower pressure detectors O and U.
[0028]
Since FIG. 4 is almost the same as the second embodiment in the third embodiment, only differences will be described. Valve stem extending from the lower limit pressure detector U 56 is now pulling the valve stem 66 of the primary pressure gas passage L of the upper pressure detecting portion does not penetrate the diaphragm chamber R _O in reaches the primary pressure gas flow valve 57, Case A spring 69 is interposed between the bracket 67 protruding from the valve body 68 and the valve body 68, and the primary pressure gas flow path L and the diaphragm chamber R _O communicate with each other.
[0029]
When the secondary pressure of the pressure regulating valve drops abnormally, the valve rod 56 rises together with the diaphragm 53, pulls up the valve shaft 66 of the primary pressure gas flow valve 57, and the primary pressure gas flows into the diaphragm chamber R _O and the shutoff valve 16 is turned on. close.
[0030]
FIG. 5 shows a fourth embodiment in which a lever 63 is linked by a long hole 62 to an interlocking member 54 integrated with a diaphragm 53 of a lower limit pressure detection unit U, and a slide valve 64 is linked to an operating point of the lever 63. .
[0031]
The slide valve 64 is mounted on a part of the flow path 65 extending from the primary pressure gas flow path L to the diaphragm chamber _RO, and the flow path 65 is opened and closed by the displacement of the diaphragm.
[0032]
When the secondary pressure of the pressure regulating valve drops abnormally, the lever 63 swings together with the diaphragm 53, the slide valve 64 linked to the operating point is lowered, the flow path 65 is opened, and the primary pressure gas flows into the diaphragm chamber R _O and shuts off. The valve 16 is closed.
[0033]
FIG. 8 shows a structure in which a spring seat 37 is formed at the lower end of the spindle 15 by adding a mechanism for preventing the shut-off valve from malfunctioning when each of the above embodiments is used under a high primary pressure. A spring 38 is loaded, and a cap nut 39 is screwed into the base of the case 40 to urge the spindle 15 downward.
[0034]
By adding this mechanism, it is possible to prevent the shutoff valve 16 from malfunctioning due to the O-ring 11a being pushed up by a high primary pressure. That is, by urging the spindle 15 in the direction in which the shutoff valve 16 is inactivated by the spring 38, the malfunction of the shutoff valve 16 due to the displacement of the spindle 15 in the secondary pressure normal state is prevented.
[0035]
【The invention's effect】
As described above, according to the present invention, when the secondary pressure is abnormally increased or abnormally decreased, a quick response is made, the shut-off valve is surely operated, and even when the primary pressure becomes abnormal pressure, the shut-off valve is surely Close to.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a first embodiment. FIG. 2 is a partially enlarged view of FIG. 1. FIG. 3 is a horizontal plan view of a second embodiment. 4) AA sectional view of FIG. 4 (a) [FIG. 5] Longitudinal sectional view of the fourth embodiment [FIG. 6] (a) Partial view of diaphragm chamber and shut-off valve (b) Connecting portion of interlocking member and stopper Detailed view (c) Detailed view of the connecting part between the other interlocking member and the stopper [FIG. 7] Explanatory view of the operation of the upper limit pressure detection part [FIG. 8] FIG. FIG. 10A is a longitudinal sectional view of a conventional pressure regulating valve with OPSO. FIG. 10B is a longitudinal sectional view of a cutoff valve of a conventional pressure regulating valve with OPSO and UPSO.
01, 51 Diaphragm mechanism 02, 52 Cover 03, 53 Diaphragm 04, 54 Interlocking element 05, 55 Pressure receiving plate 06 Reduced diameter 07 Through hole 08 Pilot valve 09 Long hole 10 Frame 11, 11a, 11b, 24, 59 O-ring 12 Pins 13 and 68 Valve body 14 Valve seat (nozzle)
15, 45 Spindle 16 Shut off valve 17 Rod 18 Main body 19 Strainer 20, 37 Spring seat 21 Shut off valve body 22, 28o, 28u, 47, 60, 69 Spring 23 鍔 25 Reset mechanism 26 Cylindrical body (of reset mechanism)
27 Reset rod 29 Cap 31 Diaphragm chamber 32, 42 Diaphragm 33, 43 Linkage 34 Lever 35, 44 Valve body 36 Nozzle 38 Spring 39 Cap nut 40 Case 41 Diaphragm chamber 43a Annular rib 43b Cylindrical body 45a Constriction 46 Notch 48, 61 Valve Seat 49 Knob 50 Case 56 Valve rod 57 Primary pressure flow valve 58 Gland 62 Long hole 63 Lever 64 Slide valve 65 Channel 66 Valve shaft 67 Bracket 68
B Ball L Primary pressure gas flow path N Knob O Upper limit pressure detector P Rod Q Valve seat R _O Diaphragm chamber (for detecting upper limit pressure)
R _U diaphragm chamber (for out lower pressure)
S Stopper U Lower limit pressure detector X Pressure adjustment valve Y Shut-off mechanism Z Shut-off valve

Claims

The shut-off valve (16), the upper / lower pressure detector (O, U) and the pressure regulating valve (X) are arranged in series in the gas flow path with the shut-off valve (16) as the primary side, and the pressure regulating valve (X the upper and lower pressure detector secondary pressure) (O, diaphragm chamber of the U) (Ro, respectively introduced into Ru), that both diaphragm chamber (Ro, the displacement of the diaphragm (03,53) of Ru) The shut-off valve (16) operates in conjunction with it, and when the secondary pressure is normal, the shut-off valve (16) is prevented from operating. When the secondary pressure exceeds the upper and lower limit pressures, the upper and lower limits In the pressure regulating valve with upper / lower pressure shut-off mechanism, wherein the pressure detector (O, U) detects it and operates the shut-off valve (16) to shut off the gas flow path ,
Toward the upper pressure detector diaphragm chamber (O) (Ro), the primary pressure gas flow path of the gas flow path (L) from the valve (08,57,64) flow path which is interposed (65) The valve (08) is opened due to the displacement of the diaphragm (03) in the diaphragm chamber of the upper limit pressure detection unit (O) due to the secondary pressure exceeding the upper limit pressure, or the valve (57, 64). Is opened by the displacement of the diaphragm (53) of the diaphragm chamber of the lower limit pressure detection unit (U) due to the secondary pressure exceeding the lower limit pressure, and the upper limit by opening the valve (08, 57, 64). A pressure regulating valve with upper / lower pressure shut-off mechanism, wherein primary pressure gas flows into a diaphragm chamber (Ro) of a pressure detecting unit (O).

The valve includes a pilot valve (08) opened by the displacement of the diaphragm (03) of the diaphragm chamber of the upper limit pressure detection unit (O) due to the secondary pressure exceeding the upper limit pressure, and the secondary pressure is lower limit. A primary pressure gas flow valve (57) that is opened by the displacement of the diaphragm (53) of the diaphragm chamber of the lower limit pressure detection unit (U) due to exceeding the pressure,
The primary pressure gas flow valve (57) As a valve stem (56) is, together with the linked to the diaphragm (53) of the diaphragm chamber of the lower pressure detector (U), the primary pressure gas flow path (L) Diaphragm case (40) of the lower limit pressure detection unit (U) penetrating to the diaphragm chamber (Ro) of the upper limit pressure detection unit (O) and facing the valve body of the valve rod (56) and the valve body. And a passage extending through the primary pressure gas flow path (L) of the valve stem (56) to the diaphragm chamber (Ro) of the upper limit pressure detection unit (O). The pressure regulating valve with upper / lower pressure shut-off mechanism according to claim 1, wherein a flow path through which the primary pressure gas flows into the diaphragm chamber (Ro) is formed .

The valve includes a pilot valve (08) opened by the displacement of the diaphragm (03) of the diaphragm chamber of the upper limit pressure detection unit (O) due to the secondary pressure exceeding the upper limit pressure, and the secondary pressure is lower limit. The lower limit pressure detection unit (U) has a thrust valve (64) that is opened by the displacement of the diaphragm (53) of the diaphragm chamber (Ru), and the thrust valve (64) is the lower limit pressure detection unit. 2. The pressure regulating valve with upper / lower pressure cutoff mechanism according to claim 1, wherein the pressure regulating valve is actuated by an interlocking member (54) interlocked with a diaphragm (53) of a diaphragm chamber of (U) .

The valve includes a pilot valve (08) opened by the displacement of the diaphragm (03) of the diaphragm chamber of the upper limit pressure detection unit (O) due to the secondary pressure exceeding the upper limit pressure, and the secondary pressure is lower limit. A valve (57, 64) that is opened by the displacement of the diaphragm (53) of the diaphragm chamber of the lower limit pressure detection unit (U) due to exceeding the pressure,
The pilot valve (08) includes a valve body (13) provided on the lower end surface of the interlock (04) that cooperates with the diaphragm (03) of the diaphragm chamber of the upper limit pressure detection unit (O), and a diaphragm case (01 ) And a valve seat (14) formed in the upper frame (10) of the hollow spindle (15) inserted into the through hole (07) in the center of the lower part, and the hollow part of the hollow spindle (15) is A flow path extending from the primary pressure gas flow path (L) toward the diaphragm chamber (Ro) of the upper limit pressure detection unit (O) is configured, and the interlock (04) and the frame (10) include the diaphragm ( 03) are coupled with play in the displacement direction, and the interlock (04) moves together in the frame (10) with the play as the diaphragm (03) is initially moved by the abnormal pressure of the secondary pressure. The valve body (13) is moved to the valve seat (1 ) The pilot valve away from (08) the upper and lower pressure shut-off mechanism with a pressure regulating valve according to any one of claims 1 to 3, characterized in that opening the.

When the pressure regulating valve with the upper / lower pressure shut-off mechanism is used under a high primary pressure, the operation of the shut-off valve (16) is made to the diaphragm (03) via a spindle (15) linked to the displacement. The spindle (15) is loaded with a spring (38), and the spring (38) urges the spindle (15) in a direction in which the shut-off valve (16) is inactivated. The upper / lower limit pressure cutoff valve according to any one of claims 1 to 4 , wherein malfunction of the cutoff valve (16) due to displacement of the spindle (15) in a normal pressure state is prevented. Pressure regulating valve.