JPH04289B2 - - Google Patents
Info
- Publication number
- JPH04289B2 JPH04289B2 JP386387A JP386387A JPH04289B2 JP H04289 B2 JPH04289 B2 JP H04289B2 JP 386387 A JP386387 A JP 386387A JP 386387 A JP386387 A JP 386387A JP H04289 B2 JPH04289 B2 JP H04289B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- valve
- bellows
- main valve
- pilot valve
- 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.)
- Expired
Links
- 230000009471 action Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 244000145845 chattering Species 0.000 description 10
- 238000005192 partition Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Control Of Fluid Pressure (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
この発明は主に蒸気用の減圧弁に関し、特にそ
の主弁を開閉する受圧応動機構の改良に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention mainly relates to a pressure reducing valve for steam, and more particularly to an improvement in a pressure-responsive mechanism for opening and closing the main valve.
＜従来の技術＞
従来の減圧弁は、第２図に示すように、一次側
入口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り主弁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す
るようになつている。その主弁３は、図の上部の
パイロツト弁４や、このパイロツト弁４にダイヤ
フラム５を介して作用する圧力設定用のばね６等
によつて制御されるピストン７の下降によつて開
動作し、ピストン７の上昇によつて閉動作する。
この開閉動作は二次側の圧力を一定に保つように
行われ、その概要は次の通りである。二次側の圧
力が低くなつた状態において、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
りパイロツト弁４がばね６による押圧力によつて
開く。入口１の高圧蒸気の一部は通路９を通つて
パイロツト弁４の弁室に導かれているので、この
高圧蒸気がパイロツト弁４の開弁によつてパイロ
ツト弁４、通路３７を通りピストン７の上部空間
に導かれ、ピストン７がばね１０の作用力に抗し
て主弁３を下方へ移動させて開く。主弁３の開弁
によつて入口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つ
てばね６を押し上げるので、パイロツト弁４がば
ね１１の作用で閉弁する。そしてピストン７の上
部空間の高圧蒸気ピストン７に設けられている細
孔１２を通つ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１０の作用力で上昇し、
主弁３が閉じる。<Prior art> As shown in FIG. 2, in a conventional pressure reducing valve, high pressure steam supplied from the primary side inlet 1 causes the main valve 3 to move downward due to a decrease in pressure on the secondary side connected to the outlet 2. It is made to move and open, allowing it to flow out to the secondary side. The main valve 3 is opened by the lowering of the piston 7, which is controlled by a pilot valve 4 at the top of the figure, a pressure setting spring 6 acting on the pilot valve 4 via a diaphragm 5, etc. , the closing operation is performed by the rising of the piston 7.
This opening/closing operation is performed to keep the pressure on the secondary side constant, and the outline thereof is as follows. In a state where the pressure on the secondary side is low, the pilot valve 4 is opened by the pressing force of the spring 6 due to the decrease in the secondary pressure acting on the lower surface of the diaphragm 5 through the passage 8. A part of the high pressure steam at the inlet 1 is led 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 37 to the piston 7. The piston 7 moves the main valve 3 downward against the force of the spring 10 to open it. 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 pressure on the secondary side acting on the lower surface of the diaphragm 5 pushes up the spring 6, so that the pilot valve 4 is closed by the action of the spring 11. The high-pressure steam is then gradually released to the secondary side through a pore 12 provided in the piston 7 in the upper space of the piston 7, and the piston 7 rises together with the main valve 3 under the action of the spring 10.
Main valve 3 closes.
＜発明が解決しようとする問題点＞
前述した構成の従来の減圧弁は、一次圧に対し
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ヤタリング現象を起こ
す。その減圧比は例えば、一次側圧力10Kg／cm2の
二次側圧力２Kg／cm2くらいに減圧する場合であ
り、主弁が作動の都度チヤタリング現象を起こ
す。このチヤタリング現象は、二次側の圧力が低
下してパイロツト弁が開弁するとき、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状態
を繰返して振動状態を呈し、略これに従つてピス
トン７の上部空間に急激な圧力変動を生じて主弁
孔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
ツト弁４が開らくが、このとき一次側の圧力が10
Kg／cm2、二次側の圧力が大気圧であるような場合
つまり始動時のような場合には、パイロツト弁４
を通つて一次側蒸気圧が急激にピストン７の上部
空間に流入して主弁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との
接触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の急激な開弁によつて二次側へ
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を急激に押し上げるので、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の動作はピストン７の軸部の曲りや
破損、主弁座の損傷等を生じる問題がある。ま
た、ばね６の設定圧を１Kg／cm2、２Kg／cm2、３
Kg／cm2、……と上げていくと、つまり減圧比を小
さくしていくと、３Kg／cm2くらいからチヤタリン
グ現象を殆ど起こさなくなることも確認された。
なお、ばね６によつて二次圧を２Kg／cm2に設定し
たときは、前記した主弁３とピストン７との接触
が離れるようなことはあまりなくなるが、主弁３
のチヤタリング現象は起こつている。<Problems to be Solved by the Invention> The conventional pressure reducing valve having the above-described configuration causes a significant chattering phenomenon when the set pressure (secondary pressure) is smaller than the primary pressure, that is, when the pressure reducing ratio is large. The pressure reduction ratio is, for example, when the pressure on the primary side is 10 kg/cm 2 and the pressure on the secondary side is reduced to about 2 kg/cm 2 , and the main valve causes a chattering phenomenon each time it operates. This chattering phenomenon occurs when the pilot valve opens due to a drop in the pressure on the secondary side, and the valve repeatedly opens to a level greater than the pressure drop and then returns to the valve closing direction, creating a vibration state. Therefore, a sudden pressure fluctuation occurs in the upper space of the piston 7, and the main valve hole 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 lowered further, the pilot valve 4 is difficult to open. pressure of 10
Kg/cm 2 , when the pressure on the secondary side is atmospheric pressure, such as during startup, the pilot valve 4
The primary side steam pressure suddenly flows into the upper space of the piston 7 through the main valve 3, and the main valve 3 repeatedly opens and closes rapidly. Contact was confirmed. This is because when the main valve 3 suddenly opens, a jet of steam toward the secondary side acts on the lower surface of the piston 7 and rapidly pushes the piston 7 up, so the main valve 3 cannot follow the rise of the piston 7. It is thought that. Re-contact is shocking, and such main valve 3
The operation of the piston 7 causes problems such as bending or breakage of the shaft portion of the piston 7 and damage to the main valve seat. Also, set pressure of spring 6 to 1Kg/cm 2 , 2Kg/cm 2 , 3
It was also confirmed that as the pressure was increased to Kg/cm 2 , that is, as the pressure reduction ratio was decreased, the chattering phenomenon almost no longer occurred from around 3 Kg/cm 2 .
Note that when the secondary pressure is set to 2 Kg/cm 2 by the spring 6, the contact between the main valve 3 and the piston 7 described above is unlikely to come apart, but the main valve 3
The chattering phenomenon is occurring.
この発明は、減圧比が大きい使用状態において
もチヤタリング現象を起こさない受圧応動機構を
具えた減圧弁を提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure reducing valve equipped with a pressure response mechanism that does not cause chattering even when the pressure reducing ratio is high.
＜問題点を解決するための手段＞
この発明の手段は、一次側に接続される入口と
二次側に接続される出口との間に設けた主弁孔を
開閉するように設けられ閉弁作用ばねを有する主
弁と、一次側圧力と二次側圧力との差圧に基いて
開弁するように設けられたパイロツト弁と、パイ
ロツト弁の開弁により一次側圧力流体を導入され
るように設けられかつ細孔を介して上記出口側に
連通した圧力室と、その圧力室内に設けられた液
体を収容した第１ベローズと、内部に液体を収容
し第１ベローズ内と小孔を介して連通され伸張動
作により上記主弁をその閉弁作用ばねに抗して開
弁させるように二次圧作用域に設けられた第２ベ
ローズとを具備するものである。<Means for solving the problem> The means of the present invention is provided to open and close the main valve hole provided between the inlet connected to the primary side and the outlet connected to the secondary side. A main valve having an action spring, a pilot valve provided to open based on the pressure difference between the primary side pressure and the secondary side pressure, and the primary side pressure fluid being introduced by opening the pilot valve. a pressure chamber provided in the pressure chamber and communicating with the outlet side via a pore; a first bellows containing a liquid provided in the pressure chamber; and a second bellows provided in a secondary pressure acting area so as to be in communication with each other and open the main valve against the valve-closing spring when the main valve is extended.
＜作用＞
前記手段によれば、パイロツト弁の開弁により
圧力室に一次側圧力流体が導入されたとき、圧力
室の圧力上昇により第１ベローズが圧縮されるか
ら、第１ベローズ内の液体が小孔を通つて第２ベ
ローズ内へ送られて二次作用域にある第２ベロー
ズが伸張動作する。この伸張動作によつて主弁を
開弁させる。一次側圧力と二次側圧力との差圧が
大きい場合パイロツト弁を介して圧力室に導入さ
れる一次側圧力流体は急激に流入することになる
が、第１ベローズと第２ベローズとの間を小孔を
介して連通してあるため、圧縮される第１ベロー
ズから第２ベローズへ送られる液体が抵抗を受け
ることにより生じるダンパー作用により第２ベロ
ーズが少し時間をかけて伸張動作するので、主弁
も徐々に開弁し、また閉弁時も略同様に徐々に閉
弁する。従つてチヤタリング現象が起こらない。
なお、主弁が開弁した後にパイロツト弁が閉じる
と一次側圧力流体が圧力室に封入される状態とな
るが、細孔の存在により、圧力室内は徐々に二次
側圧力に達するから第２ベローズが短縮して主弁
が閉弁する。従つて主弁が開弁したままの状態に
ロツクされることはない。<Operation> According to the above means, when the primary pressure fluid is introduced into the pressure chamber by opening the pilot valve, the first bellows is compressed by the pressure increase in the pressure chamber, so that the liquid in the first bellows is compressed. The second bellows is fed through the small hole into the second bellows, and the second bellows in the secondary action area is expanded. This extension action causes the main valve to open. When the differential pressure between the primary side pressure and the secondary side pressure is large, the primary side pressure fluid introduced into the pressure chamber via the pilot valve will rapidly flow in, but between the first bellows and the second bellows. Because the two bellows are connected through small holes, the liquid sent from the compressed first bellows to the second bellows receives resistance, and the damper action causes the second bellows to expand over a short period of time. The main valve also gradually opens, and when the main valve closes, it also gradually closes in substantially the same way. Therefore, no chattering phenomenon occurs.
Note that when the pilot valve closes after the main valve opens, the primary side pressure fluid is sealed in the pressure chamber, but due to the presence of pores, the pressure inside the pressure chamber gradually reaches the secondary side pressure. The bellows shortens and the main valve closes. Therefore, the main valve is not locked in the open state.
＜実施例＞
第１図に１実施例を示す。図において、第２図
に示した部分を同等部分は同一図面符号で示し、
説明を省略する。第２図の減圧弁と異なる主な点
は、ピストン７に代えて第１ベローズ３１、第２
ベローズ３２を設けた点にある。<Example> FIG. 1 shows an example. In the figures, parts that are equivalent to those shown in Figure 2 are indicated by the same drawing symbols,
The explanation will be omitted. The main difference from the pressure reducing valve in FIG. 2 is that the piston 7 is replaced by a first bellows 31 and a second
This is because a bellows 32 is provided.
この第１、第２ベローズ３１，３２を設けるた
めに主弁３１の上部空間を上下に区画する隔壁３
３を設けてある。第１、第２ベローズ３１，３２
は、略同じ大きさのもので、一端が開口してお
り、図示のようにその開口端を隔壁３３の面に
夫々結合されている。第１ベローズ３１は隔壁３
３の上面に結合したもので、隔壁３３の上側に形
成され圧力室３４内に余裕をもつて配置されてい
る。第２ベローズ３２は隔壁３３の下面に結合し
たもので、隔壁３３の下側に形成された出口２に
連通した空間（二次圧作用域）に配置されてお
り、下端面が主弁３の中心から上方突出した軸部
３ａに当接している。第１ベローズ３１と第２ベ
ローズ３２とは隔壁３３に穿設された小孔３５を
介して内部に連通しており、その内部にはオイル
３６が封入されている。 A partition wall 3 that divides the upper space of the main valve 31 into upper and lower sections in order to provide the first and second bellows 31 and 32
3 is provided. First and second bellows 31, 32
are of approximately the same size and have one end open, and the open ends are respectively connected to the surface of the partition wall 33 as shown in the figure. The first bellows 31 is the partition wall 3
3, is formed above the partition wall 33, and is arranged within the pressure chamber 34 with ample space. The second bellows 32 is connected to the lower surface of the partition wall 33 and is disposed in a space (secondary pressure action area) formed on the lower side of the partition wall 33 that communicates with the outlet 2, and its lower end surface is connected to the main valve 3. It abuts on a shaft portion 3a that protrudes upward from the center. The first bellows 31 and the second bellows 32 communicate with each other through a small hole 35 formed in the partition wall 33, and oil 36 is sealed inside.
上記圧力室３４内は、通路３７、パイロツト弁
４、通路９を介して入口１側に接続している。ま
た、圧力室３４は細孔３８を介して通路８に連通
している。図中、３９は主弁孔、４０はスクリー
ンである。 The inside of the pressure chamber 34 is connected to the inlet 1 side via a passage 37, a pilot valve 4, and a passage 9. Further, the pressure chamber 34 communicates with the passage 8 via a pore 38. In the figure, 39 is a main valve hole, and 40 is a screen.
なお、図の主弁３よりも下方の部分はスチーム
トラツプ部であり、この発明に直接関係がないの
で説明を省略する。 Note that the portion below the main valve 3 in the figure is a steam trap portion, and is not directly related to the present invention, so a description thereof will be omitted.
この減圧弁は、入口１に接続する一次側の蒸気
圧に対して出口２に圧力する二次側の蒸気圧の減
圧比が大きい設定圧で使用された時にも、チヤタ
リング現象を起こさない。前述したように二次側
圧力が低下した時にパイロツト弁４が開弁して一
次側の蒸気が通路９からパイロツト弁４、通路３
７を通つて圧力室３４に導入される。この時の流
入状態が急激であつても第１ベローズ３１を圧縮
変形されて内部のオイルを第２ベローズ３２へ流
入させるときに小孔３５を通るから、ダンパ作用
があり、パイロツト弁４が振動状態を呈したとし
ても第２ベローズ３２を介して主弁３に伝達され
る開弁力が振動状態を呈することはなく、また主
弁３が開弁して主弁孔３９から噴出する噴流力が
第２ベローズ３２に作用して第２ベローズ３２が
圧縮されるときもダンパ作用があり、第２ベロー
ズ３２の下端と主弁３の軸部３ａとの接触が離れ
るようなことはない。 This pressure reducing valve does not cause a chattering phenomenon even when used at a set pressure where the pressure reduction ratio of the steam pressure on the secondary side that is pressured at the outlet 2 to the steam pressure on the primary side connected to the inlet 1 is large. As mentioned above, when the secondary side pressure decreases, the pilot valve 4 opens and the steam on the primary side flows from the passage 9 to the pilot valve 4 and the passage 3.
7 into the pressure chamber 34. Even if the inflow state at this time is rapid, the first bellows 31 is compressed and deformed and the oil inside passes through the small hole 35 when flowing into the second bellows 32, so there is a damper effect and the pilot valve 4 vibrates. Even if the valve-opening force is transmitted to the main valve 3 via the second bellows 32, the valve-opening force that is transmitted to the main valve 3 through the second bellows 32 will not exhibit a vibration state, and the jet force that is ejected from the main valve hole 39 when the main valve 3 opens. acts on the second bellows 32 and compresses the second bellows 32, there is also a damping effect, and the lower end of the second bellows 32 never comes out of contact with the shaft portion 3a of the main valve 3.
従つて、主弁３は常に円滑に開閉し、チヤタリ
ング現象は起こらず、主弁３、その弁座、軸部３
ａ、第２ベローズ３２の軸部３ａの当接面等の損
傷も生じない。また、二次側の圧力の安定性もよ
い。 Therefore, the main valve 3 always opens and closes smoothly, no chattering phenomenon occurs, and the main valve 3, its valve seat, and shaft 3
a. Damage to the contact surface of the shaft portion 3a of the second bellows 32 does not occur. In addition, the stability of the pressure on the secondary side is also good.
＜発明の効果＞
この発明によれば、減圧比が大きくてもチヤタ
リングが起こらず、常に円滑に作動し、二次側圧
力の安定性の良い減圧弁とすることができる。<Effects of the Invention> According to the present invention, it is possible to provide a pressure reducing valve that does not cause chattering even when the pressure reduction ratio is large, always operates smoothly, and has good stability of the secondary side pressure.
第１図はこの発明の１実施例の縦断正面図、第
２図は従来の減圧弁の縦断正面図である。
１……入口、２……出口、３……主弁、４……
パイロツト弁、５……ダイヤフラム、６……ばね
（圧力設定ばね）、１０……閉弁作用ばね、３１…
…第１ダイヤフラム、３２……第２ダイヤフラ
ム、３４……圧力室、３５……小孔、３６……オ
イル（液体）、３８……細孔。
FIG. 1 is a longitudinal sectional front view of one embodiment of the present invention, and FIG. 2 is a longitudinal sectional front view of a conventional pressure reducing valve. 1...Inlet, 2...Outlet, 3...Main valve, 4...
Pilot valve, 5...Diaphragm, 6...Spring (pressure setting spring), 10...Valve closing spring, 31...
...first diaphragm, 32...second diaphragm, 34...pressure chamber, 35...small hole, 36...oil (liquid), 38...pore.
Claims (1)
る出口との間に設けた主弁孔を開閉するように設
けられ閉弁作用ばねを有する主弁と、二次側圧力
の低下に基いて開弁するように設けられたパイロ
ツト弁と、パイロツト弁の開弁により一次側圧力
流体を導入されるように設けられかつ細孔を介し
て上記出口側に連通した圧力室と、その圧力室内
に設けられた液体を収容した第１ベローズと、内
部に液体を収容し第１ベローズ内と小孔を介して
連通され伸張動作により上記主弁孔をその閉弁作
用ばねに抗して開弁させるように二次圧作用域に
設けられた第２ベローズとを具備する減圧弁。1. A main valve provided to open and close a main valve hole provided between an inlet connected to the primary side and an outlet connected to the secondary side, and having a valve-closing spring; a pilot valve provided to open when the pilot valve opens, a pressure chamber provided so that the primary side pressure fluid is introduced when the pilot valve opens, and communicating with the outlet side via a pore; A first bellows containing a liquid is provided inside the chamber, and the first bellows containing the liquid is communicated with the inside of the first bellows through a small hole, and the main valve hole is opened against the valve closing spring by an extension action. A pressure reducing valve comprising a second bellows provided in a secondary pressure acting area so as to cause the valve to close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP386387A JPS63172315A (en) | 1987-01-09 | 1987-01-09 | Pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP386387A JPS63172315A (en) | 1987-01-09 | 1987-01-09 | Pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63172315A JPS63172315A (en) | 1988-07-16 |
| JPH04289B2 true JPH04289B2 (en) | 1992-01-07 |
Family
ID=11569036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP386387A Granted JPS63172315A (en) | 1987-01-09 | 1987-01-09 | Pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63172315A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0760346B2 (en) * | 1989-07-14 | 1995-06-28 | 株式会社テイエルブイ | Temperature control valve |
-
1987
- 1987-01-09 JP JP386387A patent/JPS63172315A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63172315A (en) | 1988-07-16 |
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