JPS63204305A - Device for reacting pressure of reducing valve - Google Patents
Device for reacting pressure of reducing valveInfo
- Publication number
- JPS63204305A JPS63204305A JP3722887A JP3722887A JPS63204305A JP S63204305 A JPS63204305 A JP S63204305A JP 3722887 A JP3722887 A JP 3722887A JP 3722887 A JP3722887 A JP 3722887A JP S63204305 A JPS63204305 A JP S63204305A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- bellows
- valve
- piston
- opened
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000004044 response Effects 0.000 claims description 5
- 244000145845 chattering Species 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 5
- 238000005192 partition Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Control Of Fluid Pressure (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、減圧弁に関し、二次側圧力の変化に基いて
その主弁を直接開閉するか又は主弁を開閉するためのパ
イロット弁を開閉する受圧応動装置の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure reducing valve, and the present invention relates to a pressure reducing valve that directly opens and closes the main valve or a pilot valve for opening and closing the main valve based on changes in the pressure on the downstream side. This invention relates to improvements in pressure-responsive devices that open and close.
従来の減圧弁は、その受圧応動装置にばねとダイヤフラ
ムを用いた構成が一般的であり、そのような減圧弁には
、例えば蒸気用の減圧弁として、第２図に示すようなも
のがある。この減圧弁は、−次側人口１から供給される
高圧の蒸気が、出口２の接続する二次側の圧力の低下に
よシ主弁３が下方へ移動せしめられて開くことにより、
二次側へ流出して二次側の圧力の低下を補うようになっ
ている。その主弁３は、図の上部のパイロット弁４やこ
のパイロット弁４に関連したダイヤフラム５、圧力設定
用のばね６等によって制御されるピストン７の下降によ
って開動作し、ピストン７の上昇によって閉動作する。Conventional pressure reducing valves generally have a configuration that uses a spring and a diaphragm in their pressure response device, and examples of such pressure reducing valves include the one shown in Figure 2, which is used for steam, for example. . This pressure reducing valve is opened when high-pressure steam supplied from the outlet 1 lowers the pressure on the outlet 2, causing the main valve 3 to move downward and open.
It flows out to the secondary side to compensate for the drop in pressure on the secondary side. The main valve 3 is opened by the lowering of the piston 7, which is controlled by the pilot valve 4 at the top of the figure, the diaphragm 5 associated with the pilot valve 4, the spring 6 for setting pressure, etc., and closed by the rising of the piston 7. Operate.
この開閉動作の概要は次の通りである。二次側の圧力が
低くなった状態において、ダイヤフラム５の下面に通路
８を介して作用する二次圧の低下によりパイロット弁４
がばね６による押圧力によって開く。入口１の高圧蒸気
の一部は通路９を通ってパイロット弁４の弁室に導かれ
ているので、この高圧蒸気がパイロット弁４の開弁によ
ってパイロット弁４、通路１７を通りピストン７の上部
空間７ａに導かれ、ピストン７がばね１０の作用力に抗
して下方へ移動せしめられ、主弁３を開弁させる。主弁
３の開弁によって入口１から出口２へ高圧蒸気が流れる
。二次側の圧力が上昇して設定圧に達すると、ダイヤフ
ラム５の下面に作用する二次側の圧力によってばね６を
押し上げるので、パイロット弁４がばね１１の作用で閉
弁する。そしてピストン７の上部空間の高圧蒸気はピス
トン７に設けられている細孔１２を通って二次側に徐々
に、放出され、ピストン７が主弁３と共にばねｌＯの作
用力で上昇し、主弁３が閉じる。なお、細孔１２はピス
トン７のシールの種類が高気密性のものでないときは設
けられていない。The outline of this opening/closing operation is as follows. In a state where the pressure on the secondary side is low, the decrease in the secondary pressure acting on the lower surface of the diaphragm 5 through the passage 8 causes the pilot valve 4
is opened by the pressing force of the spring 6. A part of the high-pressure steam at the inlet 1 is guided through the passage 9 to the valve chamber of the pilot valve 4, so when the pilot valve 4 is opened, this high-pressure steam passes through the pilot valve 4 and the passage 17 to the upper part of the piston 7. The piston 7 is guided into the space 7a and moved downward against the force of the spring 10, opening the main valve 3. When the main valve 3 is opened, high pressure steam flows from the inlet 1 to the outlet 2. When the pressure on the secondary side increases and reaches the set pressure, the spring 6 is pushed up by the pressure on the secondary side acting on the lower surface of the diaphragm 5, so that the pilot valve 4 is closed by the action of the spring 11. The high-pressure steam in the upper space of the piston 7 passes through the pore 12 provided in the piston 7 and is gradually released to the secondary side, and the piston 7 rises together with the main valve 3 under the action of the spring 1O. Valve 3 closes. Note that the pores 12 are not provided when the type of seal on the piston 7 is not highly airtight.
前述した構成の従来の減圧弁は、−次圧に対して設定圧
（二次圧）が小さいとき、つまり減圧比が大きいときに
著しいチャタリング現象を起こすその減圧比は例えば、
−次側圧力１０Ｋｇ／ｄを二次側圧力２Ｋｇ／ｄ＜らい
以下に減圧する場合であシ、主弁が作動の都度チャタリ
ング現象を起こす。このチャタリング現象は、二次側の
圧力が低下してパイロット非力ｆ開弁するとき、その圧
力低下程度以上に開弁してそして閉弁方向に戻ることを
繰返して、振動状態を呈し、略これに従ってピストン７
の上部空間７ａに急激な圧力変動を生じて主弁３も振動
状態を呈するものである。実験によると、第２図の減圧
弁において、ばね６側がダイヤフラム５に接していない
状態から接触するように徐々に下降させて、さらに下降
させると、パイロット弁４が開くが、このとき−次側の
圧力が１０Ｋｇ／ｃｔｌ。In the conventional pressure reducing valve having the above-mentioned configuration, when the set pressure (secondary pressure) is small with respect to the secondary pressure, that is, when the pressure reduction ratio is large, the pressure reduction ratio causes a remarkable chattering phenomenon, for example.
- When reducing the pressure on the downstream side from 10 kg/d to less than 2 kg/d on the secondary side, the main valve causes a chattering phenomenon every time it operates. This chattering phenomenon occurs when the pressure on the secondary side decreases and the valve is opened by no pilot force, but the valve repeatedly opens to a level greater than the pressure drop and then returns to the valve closing direction, creating a vibration state. According to piston 7
A sudden pressure fluctuation occurs in the upper space 7a of the main valve 3, and the main valve 3 also exhibits a vibrating state. According to experiments, in the pressure reducing valve shown in Fig. 2, when the spring 6 side is gradually lowered from not in contact with the diaphragm 5 to contacting it, and then further lowered, the pilot valve 4 opens. The pressure is 10Kg/ctl.
二次側の圧力が大気圧であるような場合、つまシ始動時
のような場合には、パイロット弁４を通って一次側蒸気
が急激にピストン７の上部空間７ａに流入して主弁３が
急激に開きそして閉じることを繰返し、その都度ピスト
ン７と主弁３とが瞬間的に離れて再接触することが確認
された。これは主弁３の急激な開弁によって二次側へ向
う蒸気の噴流がピストン７の下面に作用してピストン７
を急激に押上げるので、ピストン７の上昇に主弁３が追
従できないからであると考えられる。再接触は衝撃的で
あり、このような主弁３とピストン７との動作はピスト
ン７の軸部７ｂの曲りや破損、主弁３の弁座の損傷等を
生じる問題がある。When the pressure on the secondary side is atmospheric pressure, such as when starting the engine, the primary side steam suddenly flows into the upper space 7a of the piston 7 through the pilot valve 4, and the main valve 3 It was confirmed that the piston 7 and the main valve 3 repeatedly opened and closed rapidly, and each time the piston 7 and the main valve 3 momentarily separated and came into contact again. This is because a jet of steam toward the secondary side acts on the lower surface of the piston 7 due to the sudden opening of the main valve 3.
This is thought to be because the main valve 3 cannot follow the rise of the piston 7 because it is pushed up rapidly. Re-contact is shocking, and such movement between the main valve 3 and the piston 7 poses problems such as bending or breakage of the shaft portion 7b of the piston 7 and damage to the valve seat of the main valve 3.
また、最近蒸気による低温加熱（１００℃以下）装置が
実用化されようとしているが、従来の減圧弁は、二次側
が大気圧よシも高い圧力で使用されるようになっておシ
、大気圧よシも低い負圧系で使用されるようにはなって
いない。In addition, recently, low-temperature heating devices (below 100°C) using steam are being put into practical use, but conventional pressure reducing valves are being used at pressures higher than atmospheric pressure on the secondary side. It is not intended to be used in negative pressure systems with low atmospheric pressure.
この発明の手段は、二次圧を導入される二次圧室と、そ
の二次圧室内に一端を内壁面に固定され内部に液体を収
容された第１ベローズと、その第１ベローズの他端に一
方の端部を結合され他方の端部を外部からの操作によ）
付勢状態を変更されるように保持された圧力設定ばねと
、大気圧の作用する区画内に一端を固定して設けられ内
部が第１ベローズに連通し液体を収容され第１ベローズ
よシも小径の第２ベローズと、第２ベローズの他端に設
けたニードル弁の弁体と、その弁体によって開閉される
弁孔をパイロット弁孔又は主弁孔とするものである。The means of the present invention includes a secondary pressure chamber into which secondary pressure is introduced, a first bellows having one end fixed to an inner wall surface and containing a liquid inside the secondary pressure chamber, and other parts of the first bellows. One end is joined to the other end by external operation)
a pressure setting spring held so that its biasing state can be changed; and a pressure setting spring which is provided with one end fixed in a section where atmospheric pressure acts, and whose interior communicates with the first bellows and accommodates a liquid, and which is also connected to the first bellows. A small-diameter second bellows, a valve body of a needle valve provided at the other end of the second bellows, and a valve hole opened and closed by the valve body are used as a pilot valve hole or a main valve hole.
この発明において、圧力設定ばねは二次側圧力が正圧で
ある場合には引張り方向に付勢し、二次側圧力が負圧で
ある場合には圧縮方向に付勢する。In this invention, the pressure setting spring is biased in the tension direction when the secondary side pressure is positive pressure, and biased in the compression direction when the secondary side pressure is negative pressure.
二次側圧力が正圧である場合に、第１ベローズには大気
圧と圧力設定ばねとが伸張方向に作用し、二次圧が圧縮
方向に作用しているから、二次圧が設定圧以下に低下す
ると、第１ベローズの圧縮作用が軽減されて第１ベロー
ズが伸張し、これによって第２ベローズ内の液体が第１
ベローズ内へ移動して第２ベローズが収縮し、ニードル
弁体が弁孔から離れて開弁する。そして二次側圧力が上
昇して設定圧になると、第１ベローズが二次圧室の圧力
上昇によシ圧縮される状態になるから短縮し内部の液体
が第２ベローズ内へ移動してこれを伸張させ、ニードル
弁体が弁孔を閉じる。このようにニードル弁体が開閉動
作するとき、第１ベローズと第２ベローズ内を液体が移
動し、その移動には流動抵抗を伴うから、従来のリフト
の小さいフラット弁がダイヤフラムの変動によって開閉
するに要する時間よりもある程度長い時間を要する。When the secondary pressure is positive pressure, the atmospheric pressure and the pressure setting spring act on the first bellows in the direction of extension, and the secondary pressure acts in the direction of compression, so the secondary pressure is the set pressure. When the pressure decreases below the first bellows, the compressive action of the first bellows is relieved and the first bellows expands, thereby causing the liquid in the second bellows to flow into the first bellows.
The second bellows contracts as it moves into the bellows, and the needle valve element separates from the valve hole to open the valve. When the secondary pressure increases and reaches the set pressure, the first bellows becomes compressed due to the increased pressure in the secondary pressure chamber, so it shortens and the liquid inside moves into the second bellows. The needle valve body closes the valve hole. When the needle valve body opens and closes in this way, the liquid moves within the first and second bellows, and this movement is accompanied by flow resistance, so conventional flat valves with small lifts open and close by fluctuations in the diaphragm. It takes a certain amount of time longer than the time required for
また、ニードル弁はその弁の特性から、流量が弁体の移
動に応じて徐々に変化する。これらのことから、ニード
ル弁を通る流体の流量は弁の開閉時に比較的なめらかに
変化し、流出側に急激な圧力変動を生じない。従って、
ニードル弁体は振動状態を呈することがなく、チャタリ
ング現象を起こさない。Further, due to the characteristics of the needle valve, the flow rate gradually changes according to the movement of the valve body. For these reasons, the flow rate of the fluid passing through the needle valve changes relatively smoothly when the valve is opened and closed, and sudden pressure fluctuations do not occur on the outflow side. Therefore,
The needle valve body does not exhibit a vibration state and does not cause chattering phenomenon.
また、二次側圧力が負圧である場合、つまり大気圧より
も低い圧力である場合に、第１４０−ズには大気圧が伸
張方向に作用し、圧力設定ばねと二次圧とが圧縮方向に
作用しているガ）ら、二次圧が設定圧以下に低下すると
、第１ベローズの圧縮作用が軽減されて第１ベローズが
伸張し、これによって前記と同様に第２ベローズ内の液
体が第１ベローズ内へ移動して第２ベローズが収縮し、
ニードル弁体が弁孔から離れて開弁する。そして二次圧
が上昇して設定圧になると、第１ベローズが圧縮される
状態になるから短縮し、内部の液体が低下に応動し、そ
の際第１ベローズ内と第２ベローズ内との間を封入液体
が移動し、前記したと同様にニードル弁体が振動状態を
呈することはなく、チャタリング現象は起こらない。In addition, when the secondary pressure is negative pressure, that is, when the pressure is lower than atmospheric pressure, the atmospheric pressure acts on the 140th spring in the direction of extension, and the pressure setting spring and the secondary pressure are compressed. When the secondary pressure decreases below the set pressure, the compressive action of the first bellows is reduced and the first bellows expands, causing the liquid in the second bellows to expand in the same way as above. moves into the first bellows and the second bellows contracts,
The needle valve body separates from the valve hole and opens the valve. Then, when the secondary pressure rises to the set pressure, the first bellows becomes compressed and shortens, and the internal liquid responds to the decrease, and at this time there is a gap between the inside of the first bellows and the inside of the second bellows. The sealed liquid moves, and the needle valve body does not vibrate as described above, and no chattering phenomenon occurs.
また、第１．ｉ２ベローズの径の相違は、ニードル弁体
のリフトに相当する変位を十分にとシ得るようにしたも
ので、第１ベローズの伸縮量が第２ベローズへ増幅され
た形で伝達され、従ってニードル弁体が開閉に必要なリ
フトが確保される。Also, 1st. The difference in diameter of the i2 bellows is such that the displacement equivalent to the lift of the needle valve body can be sufficiently achieved, and the amount of expansion and contraction of the first bellows is transmitted to the second bellows in an amplified form, so that the needle The lift necessary for the valve body to open and close is ensured.
この発明の１実施例を第１図に示す。この実施例は第２
図に示した従来の蒸気用減圧弁を部分的に改造したもの
で、第２図のものとはパイロット弁４の部分から上側が
異なっている。第１図において、２０は二次圧室、２１
は第１ベローズ、２２は圧力設定ばね、２３は第２ベロ
ーズ、２４は弁体、２５は弁孔であシ、第２図と同等部
分は同一図面符号で示しである。One embodiment of this invention is shown in FIG. This example is the second
This is a partially modified version of the conventional steam pressure reducing valve shown in the figure, and differs from the one in FIG. 2 in the upper part starting from the pilot valve 4. In FIG. 1, 20 is a secondary pressure chamber, 21
2 is a first bellows, 22 is a pressure setting spring, 23 is a second bellows, 24 is a valve body, and 25 is a valve hole. Portions equivalent to those in FIG. 2 are indicated by the same drawing symbols.
二次圧室２０は、第１ベローズ２１及び圧力設定ばね２
２を設ける気密室であシ、下側壁面を仕切板３０で形成
され、二次側の圧力が導入されるように通路８に通路３
１を介して接続されている。The secondary pressure chamber 20 includes a first bellows 21 and a pressure setting spring 2.
2, the lower wall surface is formed by a partition plate 30, and the passage 3 is connected to the passage 8 so that pressure on the secondary side is introduced.
1.
第１ベローズ２１は、下端を仕切板３０の上面に結合さ
れ上端に圧力設定ばね２２の下端を結合され、内部に液
体を収容され、外面に二次圧が作用するようになってい
る。The first bellows 21 has a lower end connected to the upper surface of the partition plate 30 and an upper end connected to the lower end of the pressure setting spring 22, and has a liquid contained therein so that a secondary pressure acts on its outer surface.
圧力設定ばね２２は、下端を２ｇｌベローズ２１の上端
に設けたばね結合部材３２に結合され、上端をナツト（
図示せず。）に結合され、そのナツトを軸方向に進退移
動させる駆動部の雄ねじに螺合させである。図示してい
ないが、駆動部は二次王室２０の壁を気密に回転可能に
貫通した軸体を設けてその軸方向移動を係止し、外部を
操作部とし、内部に設けた前記雄ねじが前記ナツトに螺
合しておシ、そのナツトを軸方向には移動するが回転し
ないようにしたものである。操作部の回転によりナツト
が軸方向に移動して圧力設定ばね２２の圧縮状態又は引
張り状態が変更される。The pressure setting spring 22 has a lower end connected to a spring coupling member 32 provided at the upper end of the 2gl bellows 21, and an upper end connected to a nut (
Not shown. ), and the nut is screwed into the male screw of the drive unit that moves the nut forward and backward in the axial direction. Although not shown, the drive section is provided with a shaft that rotatably penetrates the wall of the secondary royal chamber 20 in an airtight manner to lock its axial movement. When screwed onto the nut, the nut can be moved in the axial direction but not rotated. Rotation of the operating portion causes the nut to move in the axial direction, thereby changing the compression or tension state of the pressure setting spring 22.
ている。この第２ベローズ２３は、内部に液体を収容さ
れ、仕切板３０に穿設した連通孔３４を介して内部が第
１ベローズ２１内に連通している。また、第２ベローズ
２３は第１ベローズ２１と較べて小径に形成されている
。第２ベローズ２３は仕切板３ｏの下側に形成された区
画３５内に位置するように設けられ、その区画３５内は
開口３６を介して大気に連通している。ing. The second bellows 23 contains a liquid therein, and communicates with the first bellows 21 through a communication hole 34 formed in the partition plate 30 . Further, the second bellows 23 is formed to have a smaller diameter than the first bellows 21. The second bellows 23 is provided so as to be located within a section 35 formed below the partition plate 3o, and the inside of the section 35 communicates with the atmosphere through an opening 36.
弁体２４は、ニードル弁としたパイロット弁３７の弁孔
２５に対して設けたものであり、区画３５内から弁室３
８を通って弁孔２５に達している。弁孔２５は、弁室３
８とピストン７の上部空間７ａとを連通ずるように設け
である。弁室３８は通路９を介して一次側に連通してい
る。The valve body 24 is provided for the valve hole 25 of the pilot valve 37 which is a needle valve, and is connected to the valve chamber 3 from within the compartment 35.
8 and reaches the valve hole 25. The valve hole 25 is located in the valve chamber 3.
8 and the upper space 7a of the piston 7 are provided to communicate with each other. The valve chamber 38 communicates with the primary side via the passage 9.
このように構成された減圧弁の受圧応動装置は減圧弁を
二次側が正圧である加圧系に使用した場合、次のように
作動する。圧力設定ばね２２は予め所望の二次圧を設定
されておシ、その設定状態は第１ベローズ２１を上方へ
引張る方向の付勢状態である。二次側が設定圧以下であ
るときは、圧力段“定ばね２２の引張シ作用が打勝って
第１ベローズ２１が伸張状態となシ、これによって第２
ベローズ２３内の液体が第１ベローズ２１内に移動して
！２ベローズ２３が収縮するから、パイロット弁３７は
開弁している。従って、ピストン７の上部空間７ａには
一次側の蒸気が通路９、パイロット弁３７を通って供給
されている状態であるから、主弁３が開弁しており、入
口ｌ側から゛出口２側へ蒸気が供給されている。二次側
の圧力が上昇して設定圧になると、第１ベローズ２１に
作用する圧力が圧力設定ばね２２の引張シカに打勝って
第１ベローズ２１が圧縮されるから、第２ベローズ２３
が伸張してパイロット弁３７が閉弁する。これによって
ピスト／７が徐々に上昇して主弁３が閉弁する。The pressure response device for the pressure reducing valve configured as described above operates as follows when the pressure reducing valve is used in a pressurized system in which the secondary side has positive pressure. The pressure setting spring 22 is set to a desired secondary pressure in advance, and the set state is a biased state in which the first bellows 21 is pulled upward. When the pressure on the secondary side is lower than the set pressure, the tensile action of the pressure stage constant spring 22 is overcome and the first bellows 21 is in an extended state.
The liquid inside the bellows 23 moves into the first bellows 21! Since the second bellows 23 contracts, the pilot valve 37 is open. Therefore, since the primary side steam is being supplied to the upper space 7a of the piston 7 through the passage 9 and the pilot valve 37, the main valve 3 is open, and from the inlet l side to the outlet 2 Steam is supplied to the side. When the pressure on the secondary side rises to the set pressure, the pressure acting on the first bellows 21 overcomes the tension of the pressure setting spring 22 and the first bellows 21 is compressed, so the second bellows 23
expands and the pilot valve 37 closes. As a result, the piston/7 gradually rises and the main valve 3 closes.
また、この減圧弁は、二次側が大気圧よシも低い負圧系
に使用した場合、圧力設定ばねが圧縮状態に付勢される
ことになり、二次側を所望の負圧に維持するように作動
する。In addition, when this pressure reducing valve is used in a negative pressure system where the secondary side is lower than atmospheric pressure, the pressure setting spring is biased into a compressed state, maintaining the desired negative pressure on the secondary side. It works like this.
上記実施例は、受圧応動装置をパイロット弁に適用した
が、場合によっては主弁に適用して、直動型の減圧弁と
することもできる。In the above embodiment, the pressure response device is applied to the pilot valve, but depending on the case, it may be applied to the main valve to form a direct-acting pressure reducing valve.
〔発明の効果〕
この発明によれば、従来のダイヤフラムに代えて第１及
び第２ベローズを用いたことにより、パイロット弁又は
主弁にリフトの大きいニードル弁を用いることができ、
そのニードル弁がリフトに応じて流量が変化する特性と
、第１、第２ベローズ間を移動する液体の流動抵抗とに
よって弁体が振動状態を呈しないようにできて、チャタ
リング現象を起こさない減圧弁が得られる。従って、従
来生じていたピストンの軸部の曲シや破損、主弁の弁座
の損傷が防止される。[Effects of the Invention] According to the present invention, by using the first and second bellows in place of the conventional diaphragm, a needle valve with a large lift can be used as the pilot valve or the main valve.
Due to the characteristic of the needle valve that the flow rate changes according to the lift and the flow resistance of the liquid moving between the first and second bellows, the valve body can be prevented from vibrating, and the pressure can be reduced without causing chattering phenomenon. A valve is obtained. Therefore, bending and breakage of the shaft portion of the piston and damage to the valve seat of the main valve, which conventionally occur, are prevented.
また、この受圧応動装置を用いた減圧弁は加圧系及び負
圧系のいずれにも使用できる。Further, a pressure reducing valve using this pressure response device can be used in both a pressurized system and a negative pressure system.
第１図はこの発明の１実施例の主要部縦断正面図、第２
図は従来の減圧弁の縦断正面図である。
１・・・入口（−次側）、２・・・出口（二次側）、３
・・・主弁、７・・・ピストン、８・・・通路、９・・
・通路、２０・・・二次圧室、２１・・・第１ベローズ
、２２・・・圧力設定ばね、２３・・・第２ベローズ、
２４・・・弁体、２５・・・弁孔、３５・・・区画、３
６・・・開口、３７・・・パイロット弁。FIG. 1 is a longitudinal sectional front view of the main part of one embodiment of the present invention, and FIG.
The figure is a longitudinal sectional front view of a conventional pressure reducing valve. 1... Inlet (-next side), 2... Outlet (secondary side), 3
...Main valve, 7...Piston, 8...Passage, 9...
- Passage, 20...Secondary pressure chamber, 21...First bellows, 22...Pressure setting spring, 23...Second bellows,
24... Valve body, 25... Valve hole, 35... Division, 3
6...Opening, 37...Pilot valve.
Claims (1)
に一端を内壁面に固定され内部に液体を収容された第１
ベローズと、その第１ベローズの他端に一方の端部を結
合され他方の端部を外部からの操作により付勢状態を変
更されるように保持された圧力設定ばねと、大気圧の作
用する区画内に一端を固定して設けられ内部が第１ベロ
ーズに連通し液体を収容され第１ベローズよりも小径の
第２ベローズと、第２ベローズの他端に設けたニードル
弁の弁体と、その弁体によって開閉される弁孔をパイロ
ット弁孔又は主弁孔とする減圧弁の受圧応動装置。(1) A secondary pressure chamber into which secondary pressure is introduced, and a first chamber with one end fixed to the inner wall surface and containing liquid inside the secondary pressure chamber.
a bellows, a pressure setting spring whose one end is connected to the other end of the first bellows and whose other end is held so that its biasing state can be changed by external operation; a second bellows having one end fixedly fixed in the compartment, the inside of which communicates with the first bellows to accommodate liquid, and having a smaller diameter than the first bellows; a valve body of a needle valve provided at the other end of the second bellows; A pressure response device for a pressure reducing valve in which the valve hole opened and closed by the valve body is used as a pilot valve hole or a main valve hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3722887A JPS63204305A (en) | 1987-02-19 | 1987-02-19 | Device for reacting pressure of reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3722887A JPS63204305A (en) | 1987-02-19 | 1987-02-19 | Device for reacting pressure of reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63204305A true JPS63204305A (en) | 1988-08-24 |
| JPH041365B2 JPH041365B2 (en) | 1992-01-10 |
Family
ID=12491742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3722887A Granted JPS63204305A (en) | 1987-02-19 | 1987-02-19 | Device for reacting pressure of reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63204305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04343109A (en) * | 1991-05-20 | 1992-11-30 | Tokico Ltd | Pressure control valve |
-
1987
- 1987-02-19 JP JP3722887A patent/JPS63204305A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04343109A (en) * | 1991-05-20 | 1992-11-30 | Tokico Ltd | Pressure control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH041365B2 (en) | 1992-01-10 |
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