JP3392935B2 - Pressure regulating valve - Google Patents

Description

【発明の詳細な説明】 【０００１】 【産業上の利用分野】この発明は、例えば家庭内におけ
る台所、洗面室あるいは浴室などの給湯設備の湯水混合
栓への給水及び給湯配管系などの流体配管系に設置され
る調圧弁に関するものである。 【０００２】 【従来の技術】例えば一般家庭における台所あるいは浴
室等に設置された給湯設備の湯水混合栓への給水・給湯
には、水道等の給水配管系から給水される水の水圧と、
給湯機等の給湯配管系から給湯される湯の湯圧との間の
圧力差によって湯水混合栓から出湯される出湯温の変動
を防止するために、調圧弁が設置されている。 【０００３】従来、この種の調圧弁においては、例えば
図２及び図３に示すように、シリンダハウジング１に水
道等からの水Ｃ・Ｗを供給する給水配管系などの第１の
配管系が接続される第１の流入口２と、給湯機にて加熱
昇温された湯Ｈ・Ｗを供給する給湯配管系などが接続さ
れる第２の流入口３を一次側に開口させて設け、シリン
ダハウジング１内にシリンダ４と、このシリンダ４内に
摺動自在に設けたピストン５とを組み込むとともに、こ
のピストン５にてシリンダ４内を第１の流体室（調圧
室）６と第２の流体室（調圧室）７とに区画し、これら
第１及び第２の流体室６，７に連通する第１及び第２の
流出口８，９を二次側にそれぞれ開口させてなる構成を
有するものがある。 【０００４】すなわち、このような従来構造の調圧弁
は、第１の流体口２から供給された水Ｃ・Ｗをハウジン
グ１内に形成した第１の環状流路１１と、シリンダ４に
設けた第１のシリンダ孔４１及び円周溝４２と、ピスト
ン５の円周方向に複数設けた第１のピストン孔５１を通
して第１の流体室６内に流入させ、これら第１の流路を
通して第１の配管系からの水Ｃ・Ｗを第１の流出口８か
ら吐出させている。 【０００５】一方、第２の流体口３から供給された湯Ｈ
・Ｗをハウジング１内に形成した第２の環状流路１２
と、シリンダ４に設けた第２のシリンダ孔４３及び円周
溝４４と、ピストン５の円周方向に複数設けた第２のピ
ストン孔５２を通して第２の流体室７内に流入させ、こ
れら第２の流路を通して第２の配管系からの湯Ｈ・Ｗを
第２の流出口９から吐出させるようになっているもの
で、図３の実線矢印は、湯Ｈ・Ｗの供給・吐出流路を示
すものである。 【０００６】そして、第１の流体室６内と第２の流体室
７内とに圧力差が生じると、図４に実線矢印で示すよう
に、ピストン５が高圧側から低圧側へ移動し、このピス
トン５の移動により、各々のピストン孔５１，５２の実
質的開口面積を変化させ、これによって、第１及び第２
の流体室６，７内に流入する流体量の比及び流入する流
体の圧力損失の比を変化させることにより、第１の流体
室６内と第２の流体室７内との圧力差を解消し得るよう
になっているものである。 【０００７】図２は、例えば第１の流体室６内の圧力が
第２の流体室７内の圧力よりも高くなって、ピストン５
が第２の流体室７側に移動した後の状態を示すもので、
この状態では、第１の流体室６側のピストン孔５１の実
質的開口面積が小さくなっているために、圧力損失が大
きくなり、第１の流体室６内と第２の流体室７内との圧
力が等しくなっている。 【０００８】また、図２に示す状態から第２の流体室７
内の圧力が高くなると、ピストン５が第１の流体室６側
に移動して、第１の流体室６内と第２の流体室７内との
圧力差を解消し、これによって水圧と湯圧の調圧制御が
行なわれている。 【０００９】 【発明が解決しようとする課題】しかしながら、上記し
た従来構造の調圧弁では、シリンダ４とピストン５とク
リアランスが小さいと、流体中の微細な浮遊物等が詰ま
ったり、シリンダ４とピストン５との間で隙間腐食が発
生したりなどして、ピストン５がシリンダ４に固着し、
作動不良が生じて調圧制御が不可能になり、信頼性が低
い。 【００１０】また、シリンダ４とピストン５のクリアラ
ンスが大きいと、圧力の高い側の流体室内の流体が他方
の流体室内側へ漏れ易くなるために、両流体室間の機密
性が低いという問題があった。 【００１１】 【発明の目的】この発明の目的は、信頼性が高く、両流
体室間の機密性が高い調圧弁を提供することにある。 【００１２】 【課題を解決するための手段】上記した目的を達成する
ために、この発明は、一次側に第１の配管系に接続され
る第１の流入口を開口させ、この第１の流入口から供給
される第１の流体を第１の弁孔を介して二次側に開口さ
せた第１の流出口から吐出させてなる第１の流路に、前
記第１の弁孔を開閉する第１の弁体を設ける一方、一次
側に第２の配管系に接続される第２の流入口を開口さ
せ、この第２の流入口から供給される第２の流体を第２
の弁孔を介して二次側に開口させた第２の流出口から吐
出させてなる第２の流路に、前記第２の弁孔を開閉する
第２の弁体を設けた調圧弁であって、前記第１の流路の
二次側に前記第１の弁体を介して通じる第１の流体室
と、前記第２の流路の二次側に前記第２の弁体を介して
通じる第２の流体室とからなる調圧室を設け、この調圧
室の第１の流体室と第２の流体室とを前記第１及び第２
の弁体に連動させたダイヤフラムにて水密的に区画する
とともに、このダイヤフラムは、前記第１の流体室側の
流体圧と第２の流体室側の流体圧との圧力差による作動
にて、前記第１及び第２の流路を交互に開閉する方向に
前記第１及び第２の弁体をそれぞれ連動させ、前記第１
の流体室側の流体圧が第２の流体室側の流体圧よりも大
きくなると、前記第１の弁体を前記第１の流路を閉じる
方向に、前記第２の弁体を前記第２の流路を開く方向に
それぞれ動作可能にし、前記第１の流路における第１の
弁体の下流側の流路と第２の流路における第２の弁体の
下流側の流路とを連通する第１及び第２の連通路をそれ
ぞれ設け、これら第１及び第２の連通路に、前記第１ま
たは第２の流路側に発生する過大な圧力を他方の流路に
逃す過圧逃し弁を設けた構成としたものである。 【００１３】 【作用】この発明は、上記の構成を採用することによっ
て、調圧室内における第１の流体室内と第２の流体室内
とに圧力差が生じると、ダイヤフラムが高圧側から低圧
側へ突出するように変形し、このダイヤフラムの変形に
連動して第１及び第２の弁体が第１及び第２の流路をそ
れぞれ交互に開閉する方向に動作して、第１または第２
の流路の流路面積を増減させるために、第１または第２
の流路の流路面積が増減すると、第１及び第２の流体室
内に流入する流体量の比及び流入する流体の圧力損失の
比が変化し、これによって、第１の流体室内と第２の流
体室内との圧力差が解消される。 【００１４】すなわち、第１の流体室側の流体圧が第２
の流体室側の流体圧よりも大きくなると、第１の弁体
は、第１の流路を閉じる方向に動き、第１の流体室内に
流入する流体量が減少するとともに、第１の流体室内に
流入する流体の圧力損失が大きくなり、第１の流体室側
の流体圧が低下する一方、第２の弁体は、第２の流路を
開く方向に動き、第２の流体室内に流入する流体量が増
加するとともに、第２の流体室内に流入する流体の圧力
損失が小さくなって、第２の流体室側の流体圧が高くな
り、これによって、第１の流体室内と第２の流体室内と
の圧力差を解消するものである。 【００１５】また、第１の流体室側の流体圧が第２の流
体室側の流体圧よりも異常に高くなった場合には、第１
の流路を第１の弁体にて完全に閉じることにより、流体
の流入が止められるために、調圧弁自体や調圧弁以降の
機器の破損が防止される。 【００１６】さらに、調圧室内における第１の流体室と
第２の流体室とがダイヤフラムにて水密的に区画されて
いるために、両流体室間の機密性が高く、圧力の高い側
の流体室内の流体が他方の流体室へ漏れることがない。 【００１７】さらにまた、二次側の流体圧力が異常に高
くなった場合に、両流体室を区画するダイヤフラムが作
動限界を越えて破損する可能性があるが、第１の流路の
下流側の流路と第２の流路の下流側の流路とを連通する
第１及び第２の連通路をそれぞれ設け、これら第１及び
第２の連通路に第１または第２の流路側に発生する過大
な圧力を他方の流路に逃第１及び第２の過圧逃し弁を設
けていることにより、第１または第２の流路（第１また
は第２の流体室）の圧力を下げることが可能になるため
に、ダイヤフラムの作動限界を越えた破損が防止され
る。 【００１８】 【実施例】以下、この発明の各実施例を図１に示す図面
を参照しながら詳細に説明すると、図１はこの発明に係
る第１実施例を示すもので、図中１００は湯水混合栓等
の配管系に用いられる差動型の調圧弁である。 【００１９】この調圧弁１００には、水道等の給水配管
系Ｃ・Ｗに接続される第１の流入口１１０と、給湯機等
の給湯配管系Ｈ・Ｗに接続される第２の流入口１２０が
一次側に開口し、これら第１及び第２の流入口１１０，
１２０から第１及び第２の流路１１１，１２１を通して
水及び湯を二次側に開口させた第１及び第２の流出口１
１２，１２２からそれぞれ吐出させるようになってい
る。 【００２０】そして、前記第１の流出口１１２からの流
路１１１の途上には、第１の弁孔１１３が設けられ、こ
の第１の弁孔１１３は、前記第１の流路１１１の二次側
に配置された第１の弁体１１４にて開閉自在になってい
るとともに、この第１の弁体１１４は、前記弁孔１１３
を通して後述する調圧室１３０の第１の流体室１３１Ａ
側に臨ませた共通な弁棒１１５に連結され、この弁棒１
１５の上下動作にて前記弁体１１４を開閉する方向に動
作させることにより、前記弁孔１１３を開弁または閉弁
し得るようになっているものである。 【００２１】一方、前記第２の流出口１２０からの流路
１２１の途上には、第２の弁孔１２３が設けられ、この
第２の弁孔１２３は、前記第２の流路１２１の二次側に
配置された第２の弁体１２４にて開閉自在になっている
とともに、この第２の弁体１２４は、後述する調圧室１
３０の第２の流体室１３１Ｂ側から前記弁孔１２３を通
して臨ませた共通な弁棒１１５に連結され、この弁棒１
１５の上下動作にて前記弁体１２４を開閉する方向に動
作させることにより、前記弁孔１２３を開弁または閉弁
し得るようになっているものである。 【００２２】すなわち、前記調圧室１３０は、前記第１
の流路１１１の二次側に第１の弁体１１４を介して連通
する水室としての第１の流体室１３１Ａと、前記第２の
流路１２１に第２の弁体１２４を介して連通する湯室と
しての第２の流体室１３１Ｂとにダイヤフラム１３２に
て水密的に区画されているとともに、このダイヤフラム
１３２には、前記第１の弁体１１４及び第２の弁体１２
４を交互に開閉動作させる弁棒１１５が連動可能に連結
されている。 【００２３】しかして、上記の構成によれば、前記調圧
弁１００内に設けた調圧室１３０の湯室（第２の流体
室）１３１Ｂ側の湯圧Ｐ２が他所出湯などにより低くな
ると、水室（第１の流体室）１３１Ａ側の水圧Ｐ１との
間の圧力差により、ダイヤフラム１３１が高圧側の水室
１３１Ａ側から低圧側の湯室１３１Ｂ側へ突出するよう
に上方に変形作動して、弁棒１１５を上動させ、これに
よって、第１の弁体１１４は第１の弁孔１１３を閉じる
方向、すなわち、第１の流路１１１を閉じる方向に動作
し、第２の弁体１２４は第２の弁孔１２３を開く方向、
すなわち、第２の流路１２１を開く方向に動作する。 【００２４】このように、第１の弁体１１４が第１の流
路１１１を閉じる方向に動作すると、水室１３１Ａ内に
流入する水Ｃ・Ｗの流量が減少するとともに、流入する
流体の圧力損失が大きくなり、水室１３１Ａ側の水圧Ｐ
１が低下する一方、第２の弁体１１２が第２の流路１２
１を開く方向に動作すると、湯室１３１Ｂ内に流入する
湯Ｈ・Ｗの流量が増加するとともに、流入する流体の圧
力損失が小さくなって、湯室１３１Ｂ側の湯圧Ｐ２が高
くなり、水室１３１Ａ側の水圧Ｐ１と湯室１３１Ｂ側の
湯圧Ｐ２とがバランスするために、水室１３１Ａと湯室
１３１Ｂとの圧力差が解消され、これによって、それら
の下流側に接続される湯水混合栓（図示せず）からの出
湯温の変動を防止し得るように制御可能にしているもの
である。 【００２５】また、この発明に係る差動型の調圧弁で
は、前記第１の流路１１１における第１の弁体１１４の
下流側の流路と、第２の流路１２１における第２の弁体
１２４の下流側の流路との間に第１及び第２の連通路１
４１，１４２をそれぞれ設け、これら第１及び第２の連
通路１４１，１４２に逃し弁１５１，１５２を設置して
なる構成を有するもので、これら第１及び第２の逃し弁
１５１，１５２は、前記第１または第２の流路１１２，
１２１側に発生する過大な差圧を他方の流路１１１また
は１２１の二次側の流出口１２２または１１２側に逃す
ようになっている。 【００２６】そして、このような逃し弁１５１，１５２
の作動により、ダイヤフラム１３２に過大な差圧が加わ
ることがないようにし、これによって、ダイヤフラム１
３２の作動限界を越えた破損が防止されるようになって
いる。 【００２７】 【発明の効果】以上の説明から明らかなように、この発
明は、一次側に第１の配管系に接続される第１の流入口
を開口させ、この第１の流入口から供給される第１の流
体を第１の弁孔を介して二次側に開口させた第１の流出
口から吐出させてなる第１の流路に、前記第１の弁孔を
開閉する第１の弁体を設ける一方、一次側に第２の配管
系に接続される第２の流入口を開口させ、この第２の流
入口から供給される第２の流体を第２の弁孔を介して二
次側に開口させた第２の流出口から吐出させてなる第２
の流路に、前記第２の弁孔を開閉する第２の弁体を設け
た調圧弁であって、前記第１の流路の二次側に前記第１
の弁体を介して通じる第１の流体室と、前記第２の流路
の二次側に前記第２の弁体を介して通じる第２の流体室
とからなる調圧室を設け、この調圧室の第１の流体室と
第２の流体室とを前記第１及び第２の弁体に連動させた
ダイヤフラムにて水密的に区画するとともに、このダイ
ヤフラムは、前記第１の流体室側の流体圧と第２の流体
室側の流体圧との圧力差による作動にて、前記第１及び
第２の流路を交互に開閉する方向に前記第１及び第２の
弁体をそれぞれ連動させ、前記第１の流体室側の流体圧
が第２の流体室側の流体圧よりも大きくなると、前記第
１の弁体を前記第１の流路を閉じる方向に、前記第２の
弁体を前記第２の流路を開く方向にそれぞれ動作可能に
し、前記第１の流路における第１の弁体の下流側の流路
と第２の流路における第２の弁体の下流側の流路とを連
通する第１及び第２の連通路をそれぞれ設け、これら第
１及び第２の連通路に、前記第１または第２の流路側に
発生する過大な圧力を他方の流路に逃す過圧逃し弁を設
けたことを特徴とするものである。 これにより、調圧室
内における第１の流体室内と第２の流体室内とに圧力差
が生じると、ダイヤフラムが高圧側から低圧側へ突出す
るように変形し、このダイヤフラムの変形に連動して第
１及び第２の弁体が第１の流路を開閉する方向に動作し
て、第１及び第２の流路の流路面積を増減させるため
に、第１及び第２の流体室内に流入する流体量の比及び
流入する流体の圧力損失の比を変化させることができ
る。 【００２８】これによって、第１の流体室内と第２の流
体室内との圧力差を解消することができ、しかも、第１
の流体室側の流体圧が第２の流体室側の流体圧よりも異
常に高くなった場合には、第１の流路を第１の弁体にて
完全に閉じることにより、流体の流入を止めることがで
きるために、調圧弁自体や調圧弁以降の機器の破損を防
止することができ、信頼性を高めることができる。 【００２９】また、第１の流体室と第２の流体室とがダ
イヤフラムにて水密的に区画されているために、両流体
室間の機密性を高めることができ、圧力の高い側の流体
室内の流体が他方の流体室へ漏れることがない。 【００３０】さらに、上述したように第１の流路におけ
る第１の弁体の下流側の流路と第２の流路における第１
の弁体の下流側の流路とを連通する第１及び第２の連通
路を設け、これら第１及び第２の連通路に、第１または
第２の流路側に発生する過大な圧力を第２または第１の
流路に逃す第１及び第２の過圧逃し弁をそれぞれ設けて
いるので、第１または第２の流路（第１または第２の流
体室）の圧力が異常に高くなった場合に、第１または第
２の流路（第１または第２の流体室）の圧力を下げるこ
とができるために、ダイヤフラムの作動限界を越えた破
損を防止することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pipe for supplying hot water to a hot / water mixer tap of a hot water supply equipment such as a kitchen, a washroom or a bathroom in a home. It relates to a pressure regulating valve installed in a system. [0002] For example, when supplying water to a hot / water mixer tap of a hot water supply system installed in a kitchen or a bathroom in a general household, the pressure of water supplied from a water supply piping system such as a water supply,
2. Description of the Related Art A pressure regulating valve is provided to prevent a change in the temperature of hot water discharged from a hot-water mixer tap due to a pressure difference between the hot water supplied from a hot water supply pipe system of a water heater and the like. Conventionally, in this type of pressure regulating valve, as shown in FIGS. 2 and 3 , for example, a first piping system such as a water supply piping system for supplying water C / W from water or the like to a cylinder housing 1 is provided. A first inflow port 2 to be connected and a second inflow port 3 to which a hot water supply pipe system for supplying hot water H / W heated and heated by a water heater are connected to be opened to the primary side; A cylinder 4 and a piston 5 slidably provided in the cylinder 4 are incorporated in the cylinder housing 1, and the first fluid chamber (pressure regulation chamber) 6 and the second And first and second outlets 8 and 9 communicating with the first and second fluid chambers 6 and 7 are opened to the secondary side, respectively. Some have a configuration. That is, in the pressure regulating valve having such a conventional structure, the water C · W supplied from the first fluid port 2 is provided in the first annular flow path 11 formed in the housing 1 and the cylinder 4. The fluid flows into the first fluid chamber 6 through the first cylinder hole 41 and the circumferential groove 42 and through a plurality of first piston holes 51 provided in the circumferential direction of the piston 5. Is discharged from the first outflow port 8. On the other hand, the hot water H supplied from the second fluid port 3
A second annular channel 12 in which W is formed in the housing 1
And a second cylinder hole 43 and a circumferential groove 44 provided in the cylinder 4, and a plurality of second piston holes 52 provided in the circumferential direction of the piston 5 to flow into the second fluid chamber 7. The hot water H · W from the second piping system is discharged from the second outlet 9 through the second flow path. The solid arrows in FIG. 3 indicate the supply / discharge flow of the hot water H · W. It shows a road. When a pressure difference is generated between the first fluid chamber 6 and the second fluid chamber 7, the piston 5 moves from the high pressure side to the low pressure side as shown by a solid arrow in FIG. The movement of the piston 5 changes the substantial opening area of each of the piston holes 51 and 52, whereby the first and second piston holes 51 and 52 are changed.
The pressure difference between the first fluid chamber 6 and the second fluid chamber 7 is eliminated by changing the ratio of the amount of fluid flowing into the fluid chambers 6 and 7 and the ratio of the pressure loss of the flowing fluid. It is something that can be done. FIG. 2 shows that, for example, the pressure in the first fluid chamber 6 becomes higher than the pressure in the second fluid chamber 7 and the piston 5
Shows a state after moving to the second fluid chamber 7 side,
In this state, since the substantial opening area of the piston hole 51 on the first fluid chamber 6 side is reduced, the pressure loss increases, and the inside of the first fluid chamber 6 and the interior of the second fluid chamber 7 are reduced. Pressures are equal. Further, the second fluid chamber from the state shown in FIG. 2 7
When the internal pressure increases, the piston 5 moves to the first fluid chamber 6 side to eliminate the pressure difference between the first fluid chamber 6 and the second fluid chamber 7, whereby the water pressure and the hot water Pressure regulation control is performed. However, in the pressure regulating valve having the above-described conventional structure, if the clearance between the cylinder 4 and the piston 5 is small, fine floating substances in the fluid may be clogged, or the cylinder 4 and the piston The piston 5 sticks to the cylinder 4 due to crevice corrosion or the like,
Operation failure occurs and pressure regulation control becomes impossible, resulting in low reliability. If the clearance between the cylinder 4 and the piston 5 is large, the fluid in the fluid chamber on the high pressure side tends to leak into the other fluid chamber, so that the confidentiality between the two fluid chambers is low. there were. SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure regulating valve which is highly reliable and has high confidentiality between both fluid chambers. [0012] To achieve the Means for Solving the Problems] above object, the present invention, a first inlet connected to the first piping system is open mouth on the primary side, the first the first flow path formed by ejected from the first outlet of the first fluid was opened to the secondary side through the first valve hole supplied from the inlet, before
While Ru is provided a first valve body for opening and closing the serial first valve hole, primary
A second inlet connected to the second piping system on the side to open the mouth, the second fluid supplied from the second inlet the second
Opening and closing the second valve hole in a second flow path discharged from the second outlet port opened to the secondary side through the valve hole of
A pressure regulating valve provided with a second valve element , wherein a first fluid chamber communicating with the secondary side of the first flow path through the first valve element; A pressure regulating chamber including a second fluid chamber communicating with the second valve body via the second valve body is provided on the next side, and the first fluid chamber and the second fluid chamber of the pressure regulating chamber are connected to the first and second fluid chambers. 2
And a diaphragm interlocked with the valve body of the first fluid chamber, and the diaphragm is operated by a pressure difference between the fluid pressure on the first fluid chamber side and the fluid pressure on the second fluid chamber side. The first and second valve bodies are interlocked with each other in a direction to open and close the first and second flow paths alternately,
When the fluid pressure on the fluid chamber side becomes larger than the fluid pressure on the second fluid chamber side, the second valve body is moved in the direction in which the first valve body closes the first flow path. Operable in a direction to open the first flow path, and the first flow path in the first flow path
Of the second valve body in the flow path on the downstream side of the valve body and the second flow path
The first and second communication paths communicating with the downstream flow path
The first and second communication passages are respectively provided in the first and second communication paths.
Or excessive pressure generated on the side of the second flow path
The overpressure relief valve for relief is provided . According to the present invention, by adopting the above structure, when a pressure difference occurs between the first fluid chamber and the second fluid chamber in the pressure regulating chamber, the diaphragm moves from the high pressure side to the low pressure side. The first and second valve bodies operate in such a manner as to alternately open and close the first and second flow paths, respectively, in conjunction with the deformation of the diaphragm.
In order to increase or decrease the flow path area of the flow path of the first or second flow path,
When the flow path area of the flow path increases or decreases, the ratio of the amount of fluid flowing into the first and second fluid chambers and the ratio of the pressure loss of the flowing fluid changes, whereby the first fluid chamber and the second Of the pressure in the fluid chamber is eliminated. That is, the fluid pressure on the first fluid chamber side is the second fluid pressure.
When the fluid pressure becomes higher than the fluid pressure on the fluid chamber side of the first fluid chamber, the first valve body moves in a direction to close the first flow path, the amount of fluid flowing into the first fluid chamber decreases, and The pressure loss of the fluid flowing into the first fluid chamber increases, and the fluid pressure on the first fluid chamber side decreases. On the other hand, the second valve body moves in a direction to open the second flow path, and flows into the second fluid chamber. As the amount of fluid flowing increases, the pressure loss of the fluid flowing into the second fluid chamber decreases, and the fluid pressure on the side of the second fluid chamber increases. This is to eliminate the pressure difference between the fluid chamber. If the fluid pressure on the first fluid chamber side becomes abnormally higher than the fluid pressure on the second fluid chamber side, the first
By completely closing the flow path with the first valve body, the inflow of the fluid is stopped, so that damage to the pressure regulating valve itself and devices subsequent to the pressure regulating valve are prevented. Further, since the first fluid chamber and the second fluid chamber in the pressure regulation chamber are water-tightly partitioned by the diaphragm, the confidentiality between the two fluid chambers is high, and the pressure side is higher. The fluid in the fluid chamber does not leak to the other fluid chamber. Further, when the fluid pressure on the secondary side becomes abnormally high, the diaphragm that partitions the two fluid chambers may exceed the operating limit and break, but the downstream side of the first flow path may be damaged. The first and second communication passages are provided respectively for communicating the first and second communication passages with the downstream flow passage of the second flow passage, and the first and second communication passages are provided on the first or second flow passage side. The first and second overpressure relief valves are provided in the other flow path to release the generated excessive pressure, so that the pressure in the first or second flow path (first or second fluid chamber) is reduced. Because it can be lowered, breakage of the diaphragm beyond its operational limits is prevented. Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIG. 1. FIG. 1 shows a first embodiment according to the present invention. This is a differential pressure regulating valve used for a piping system such as a hot water mixing tap. The pressure regulating valve 100 has a first inlet 110 connected to a water supply piping system C / W such as water supply, and a second inlet connected to a hot water supply piping system H / W such as a water heater. 120 is open to the primary side and these first and second inlets 110,
First and second outlets 1 from which water and hot water are opened to the secondary side from 120 through first and second flow paths 111 and 121.
The ink is ejected from 12, 12 respectively. A first valve hole 113 is provided on the way of the flow path 111 from the first outlet 112, and the first valve hole 113 The first valve element 114 disposed on the next side can be opened and closed freely, and the first valve element 114
Through the first fluid chamber 131A of the pressure regulating chamber 130 to be described later.
This valve stem 1 is connected to a common valve stem 115 facing the side.
By operating the valve element 114 in the opening and closing direction by the up and down movement of the valve 15, the valve hole 113 can be opened or closed. On the other hand, a second valve hole 123 is provided in the middle of the flow path 121 from the second outlet port 120, and the second valve hole 123 is connected to the second flow path 121. The second valve element 124 disposed on the next side is openable and closable, and the second valve element 124 is connected to a pressure regulating chamber 1 described later.
30 from the second fluid chamber 131B side to a common valve stem 115 facing through the valve hole 123, and this valve stem 1
The valve hole 123 can be opened or closed by operating the valve body 124 in the opening and closing direction by the up and down movement of the valve 15. That is, the pressure regulation chamber 130 is provided with the first
A first fluid chamber 131A as a water chamber communicating with the secondary side of the flow path 111 via a first valve element 114, and communicating with the second flow path 121 via a second valve element 124. A second fluid chamber 131B serving as a hot water chamber is partitioned in a watertight manner by a diaphragm 132, and the first valve body 114 and the second valve body 12 are provided in the diaphragm 132.
A valve stem 115 for alternately opening and closing 4 is connected to be interlockable. However, according to the above configuration, when the hot water pressure P2 on the hot water chamber (second fluid chamber) 131B side of the pressure adjusting chamber 130 provided in the pressure adjusting valve 100 becomes lower due to hot water discharged from another place, water is generated. Due to the pressure difference between the water pressure P1 on the chamber (first fluid chamber) 131A side, the diaphragm 131 is deformed upward so as to project from the water chamber 131A on the high pressure side to the hot water chamber 131B on the low pressure side. Then, the valve stem 115 is moved upward, whereby the first valve element 114 operates in the direction to close the first valve hole 113, that is, the direction to close the first flow path 111, and the second valve element 124 Is a direction in which the second valve hole 123 is opened,
That is, it operates in a direction to open the second flow path 121. As described above, when the first valve element 114 operates in the direction to close the first flow path 111, the flow rate of the water C · W flowing into the water chamber 131A decreases, and the pressure of the flowing fluid increases. The loss increases and the water pressure P on the water chamber 131A side increases.
1 decreases, while the second valve body 112
1, the flow rate of the hot water H · W flowing into the hot water chamber 131B increases, the pressure loss of the flowing fluid decreases, the hot water pressure P2 on the hot water chamber 131B side increases, and Since the water pressure P1 on the chamber 131A side and the water pressure P2 on the hot water chamber 131B are balanced, the pressure difference between the water chamber 131A and the hot water chamber 131B is eliminated, thereby mixing the hot and cold water connected downstream thereof. The control can be performed so as to prevent a change in the temperature of tap water from a tap (not shown). [0025] In addition, in the pressure regulating valve of the differential type according to this invention
Includes a downstream side of the flow path of the first valve body 114 in the first flow path 111, the first and between the downstream side of the flow path of the second valve element 124 in the second flow path 121 Second communication path 1
41, 142 are provided, and relief valves 151, 152 are provided in the first and second communication passages 141, 142. The first and second relief valves 151, 152 are The first or second flow path 112,
An excessive differential pressure generated on the side 121 is released to the outlet 122 or 112 on the secondary side of the other flow path 111 or 121. Then, such relief valves 151, 152
Prevents an excessive differential pressure from being applied to the diaphragm 132, whereby the diaphragm 1
Damage beyond the operating limit of 32 is prevented. As is apparent from the above description, the present invention has a first inlet connected to the first piping system on the primary side .
Was open mouth, first the first channel formed by discharged from the outlet of which is opened to the secondary side through the first valve hole the first fluid supplied from the first inlet The first valve hole
While Ru is provided a first valve body for opening and closing, the second inlet being connected to the second piping system is open mouth on the primary side, the second fluid supplied from the second inlet the A second outlet discharged from a second outlet opened to the secondary side through the second valve hole .
A second valve element for opening and closing the second valve hole in the flow path
It is other pressure regulating valve, the first to the secondary side of the first flow path
A pressure regulating chamber comprising a first fluid chamber communicating through the valve body of the second fluid chamber and a second fluid chamber communicating through the second valve body on the secondary side of the second flow path; The first fluid chamber and the second fluid chamber of the pressure regulating chamber are water-tightly partitioned by a diaphragm interlocked with the first and second valve bodies, and the diaphragm is provided in the first fluid chamber. The first and second valve bodies are moved in a direction in which the first and second flow paths are alternately opened and closed by an operation based on a pressure difference between the fluid pressure on the fluid side and the fluid pressure on the second fluid chamber. When the fluid pressure on the first fluid chamber side becomes higher than the fluid pressure on the second fluid chamber side, the first valve body is moved in the direction to close the first flow path, and A valve element is operable in a direction to open the second flow path, and a flow path on the downstream side of the first valve element in the first flow path.
And the second flow path downstream of the second valve body in the second flow path.
First and second communication paths are provided, respectively,
In the first and second communication paths, on the first or second flow path side
Install an overpressure relief valve to release the excessive pressure generated to the other flow path.
It is characterized in that Accordingly, when a pressure difference occurs between the first fluid chamber and the second fluid chamber in the pressure regulation chamber, the diaphragm is deformed so as to project from the high pressure side to the low pressure side, and the diaphragm is deformed in conjunction with the deformation of the diaphragm. The first and second valve bodies operate in the direction to open and close the first flow path, and flow into the first and second fluid chambers to increase or decrease the flow area of the first and second flow paths. It is possible to change the ratio of the amount of fluid flowing and the ratio of the pressure loss of the flowing fluid. Thus, the pressure difference between the first fluid chamber and the second fluid chamber can be eliminated.
When the fluid pressure on the fluid chamber side becomes abnormally higher than the fluid pressure on the second fluid chamber side, the first flow path is completely closed by the first valve body, thereby inflow of fluid. Can be stopped, so that damage to the pressure regulating valve itself and devices subsequent to the pressure regulating valve can be prevented, and reliability can be improved. Further, since the first fluid chamber and the second fluid chamber are water-tightly partitioned by the diaphragm, the confidentiality between the two fluid chambers can be enhanced, and the fluid on the high pressure side can be increased. The fluid in the chamber does not leak to the other fluid chamber. Further , as described above, the flow path on the downstream side of the first valve body in the first flow path and the first flow path in the second flow path
First and second communication paths communicating with the flow path on the downstream side of the valve body are provided, and excessive pressure generated on the first or second flow path side is applied to the first and second communication paths. First and second overpressure relief valves are provided to release to the second or first flow path, respectively.
Because there, the first or second flow path when the pressure in (first or second fluid chamber) becomes abnormally high, first or second flow paths (first or second fluid chamber) Since the pressure of the diaphragm can be reduced, it is possible to prevent the diaphragm from being broken beyond the operation limit.

【図面の簡単な説明】 【図１】この発明に係る調圧弁の実施例を示す概略的断
面図。 【図２】従来の調圧弁の一例を示す概略的断面図。 【図３】図２のＡ−Ａ線における断面図。 【符号の説明】 １００…調圧弁、１１０…第１の流入口、１１１…第１
の流路、１１２…第１の流出口、１１３…第１の弁孔、
１１４…第１の弁体、１１５…弁棒、１２０…第２の流
入口、１２１…第２の流路、１２２…第２の流出口、１
２３…第２の弁孔、１２４…第２の弁体、１３０…調圧
室、１３１Ａ…第１の流体室、１３１Ｂ…第２の流体
室、１３２…ダイヤフラム、１４１…第１の連通路、１
４２…第２の連通路、１５１…第１の逃し弁、１５２…
第２の逃し弁、Ｃ・Ｗ…第１の配管系（給水配管系）、
Ｈ・Ｗ…第２の配管系（給湯配管系）。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing the actual施例of the pressure regulating valve according to the present invention. FIG. 2 is a schematic sectional view showing an example of a conventional pressure regulating valve . FIG. 3 is a sectional view taken along line AA of FIG . 2 ; [Description of Signs] 100: pressure regulating valve, 110: first inlet, 111: first
Channel 112, a first outlet 113, a first valve hole,
114: first valve body, 115: valve stem, 120: second inlet, 121: second flow path, 122: second outlet, 1
23 ... second valve hole, 124 ... second valve element, 130 ... pressure regulating chamber, 131A ... first fluid chamber, 131B ... second fluid chamber, 132 ... diaphragm, 141 ... first communication path, 1
42 ... second communication passage, 151 ... first relief valve, 152 ...
Second relief valve, C / W: first piping system (water supply piping system),
HW: Second piping system (hot water supply piping system).

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.⁷，ＤＢ名) F16K 17/22 F16K 11/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 17/22 F16K 11/00

Claims (1)

(57)【特許請求の範囲】 【請求項１】 一次側に第１の配管系に接続される第１
の流入口を開口させ、この第１の流入口から供給される
第１の流体を第１の弁孔を介して二次側に開口させた第
１の流出口から吐出させてなる第１の流路に、前記第１
の弁孔を開閉する第１の弁体を設ける一方、一次側に 第２の配管系に接続される第２の流入口を開口
させ、この第２の流入口から供給される第２の流体を第
２の弁孔を介して二次側に開口させた第２の流出口から
吐出させてなる第２の流路に、前記第２の弁孔を開閉す
る第２の弁体を設けた調圧弁であって、 前記第１の流路の二次側に前記第１の弁体を介して通じ
る第１の流体室と、前記第２の流路の二次側に前記第２
の弁体を介して通じる第２の流体室とからなる調圧室を
設け、 この調圧室の第１の流体室と第２の流体室とを前記第１
及び第２の弁体に連動させたダイヤフラムにて水密的に
区画するとともに、 このダイヤフラムは、前記第１の流体室側の流体圧と第
２の流体室側の流体圧との圧力差による作動にて、前記
第１及び第２の流路を交互に開閉する方向に前記第１及
び第２の弁体をそれぞれ連動させ、 前記第１の流体室側の流体圧が第２の流体室側の流体圧
よりも大きくなると、前記第１の弁体を前記第１の流路
を閉じる方向に、前記第２の弁体を前記第２の流路を開
く方向にそれぞれ動作可能にし、 前記第１の流路における第１の弁体の下流側の流路と第
２の流路における第２の弁体の下流側の流路とを連通す
る第１及び第２の連通路をそれぞれ設け、 これら第１及び第２の連通路に、前記第１または第２の
流路側に発生する過大な圧力を他方の流路に逃す過圧逃
し弁を設けた ことを特徴とする調圧弁。(57) [Claim 1] A first pipe connected to a first piping system on a primary side .
Of the inlet is open mouth, first made by discharging from a first outlet which is opened to the secondary side through the first valve hole the first fluid supplied from the first inlet The first channel
While Ru is provided a first valve body for opening and closing the valve hole, a second inlet connected to the second piping system is open mouth to the primary side, a second supplied from the second inlet the fluid first
The second valve hole is opened and closed in a second flow path discharged from the second outlet port opened to the secondary side through the second valve hole.
A pressure regulating valve provided with a second valve body , wherein: a first fluid chamber communicating with a secondary side of the first flow path via the first valve body; The second on the secondary side
And a second fluid chamber communicating with the first fluid chamber via the valve body. The first fluid chamber and the second fluid chamber of the pressure chamber are connected to each other by the first fluid chamber.
And a diaphragm interlocked with a second valve element to partition in a water-tight manner, and the diaphragm operates by a pressure difference between a fluid pressure on the first fluid chamber side and a fluid pressure on the second fluid chamber side. In the above, the first and second valve bodies are interlocked in a direction in which the first and second flow paths are alternately opened and closed, and the fluid pressure on the first fluid chamber side is on the second fluid chamber side. becomes greater than the fluid pressure, the the first valve body in a direction closing the first flow path, and the second valve body operable respectively in the opening direction of the second flow path, said first The flow path on the downstream side of the first valve body in the first flow path and the second flow path
The second flow path communicates with the flow path downstream of the second valve element.
First and second communication paths are provided, respectively, and the first or second communication paths are provided in these first and second communication paths.
Overpressure relief that releases excessive pressure generated on the flow path side to the other flow path
It is that the pressure regulating valve, characterized in that the the valve is provided.