JPH0379883A - Flow control valve - Google Patents
Flow control valveInfo
- Publication number
- JPH0379883A JPH0379883A JP21568789A JP21568789A JPH0379883A JP H0379883 A JPH0379883 A JP H0379883A JP 21568789 A JP21568789 A JP 21568789A JP 21568789 A JP21568789 A JP 21568789A JP H0379883 A JPH0379883 A JP H0379883A
- Authority
- JP
- Japan
- Prior art keywords
- valve body
- valve
- fluid
- pilot
- guide plate
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 230000002093 peripheral effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Details Of Valves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、流量制御弁に関し、特に弁体の２次側に発生
するキャビテーションの抑制効果を増強した流量制御弁
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow control valve, and more particularly to a flow control valve that has an enhanced effect of suppressing cavitation occurring on the secondary side of a valve body.
従来、流量制御弁（バタフライ弁）の絞り運転（小開度
）時には、弁体の２次側（下流側）（こキャビテーショ
ンが発生し、弁体を損傷する慮があるので、特開昭５７
−１５７８６６号公報に示されるように、弁体の周縁部
に櫛歯状突起を配設して、流体の流れを分割案内し、突
起間のスリットから流体を細かいジェット流に変え、弁
体の下流側で発生するキャビテーションを分散するとと
もに、キャビテーションの成長、及び該キャビテーショ
ンによる騒音や振動を極力抑制している。Conventionally, during throttling operation (small opening) of a flow control valve (butterfly valve), cavitation may occur on the secondary side (downstream side) of the valve body, which could damage the valve body.
As shown in Japanese Patent No. 157866, comb-like protrusions are provided on the periphery of the valve body to divide and guide the flow of fluid, converting the fluid into a fine jet stream from the slits between the protrusions, and Cavitation generated on the downstream side is dispersed, and the growth of cavitation and the noise and vibration caused by the cavitation are suppressed as much as possible.
しかしながら、上述の構造のバタフライ弁であっても、
キャビテーションを抑制する効果が必ずしも充分ではな
く、さらに耐キヤビテーシヨン特性に優れた流量制御弁
の開発が望まれていた。However, even with the butterfly valve having the above structure,
The effect of suppressing cavitation is not necessarily sufficient, and there has been a desire to develop a flow control valve that has excellent cavitation resistance.
そこで本発明は、キャビテーションの抑制効果を増強し
、絞り運転を良好に行なえるとともに、低騒音、低振動
化を図った流量制御弁を提供することを目的としている
。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flow control valve that can enhance the cavitation suppressing effect, perform throttling operation well, and achieve low noise and vibration.
上記した目的を達成するために、本発明の流量制御弁は
、弁箱内に弁軸を介して弁体を回動可能に設けた流量制
御弁において、弁体１次側の流体を、パイロット弁を介
して前記弁軸内に形成した軸方向の流路に導入し、該流
路から弁体２次側に導出するパイロット経路を設けると
ともに、該パイロット経路から弁体２次側に導出した流
体を弁体２次側の外周部に案内する案内板を弁体に設け
たことを特徴としている。In order to achieve the above object, the flow control valve of the present invention is a flow control valve in which a valve body is rotatably provided in a valve body via a valve shaft, and the fluid on the primary side of the valve body is controlled by a pilot. A pilot path was provided through which the water was introduced into an axial flow path formed in the valve shaft through the valve, and led out from the flow path to the secondary side of the valve body, and was led out from the pilot path to the secondary side of the valve body. It is characterized in that the valve body is provided with a guide plate that guides the fluid to the outer periphery of the secondary side of the valve body.
上記のごとく構成することにより、絞り運転の小開度時
に弁体１次側の流体をパイロット経路から弁体２次側に
供給し、案内板により弁体２次側の外周部に案内するこ
とができ、弁体外周部の流体の負圧状態を緩和し、キャ
ビテーションの発生を抑制することができる。By configuring as above, the fluid on the primary side of the valve body is supplied from the pilot path to the secondary side of the valve body when the opening degree is small during throttling operation, and the fluid is guided to the outer circumference of the secondary side of the valve body by the guide plate. This makes it possible to alleviate the negative pressure state of the fluid around the outer periphery of the valve body and suppress the occurrence of cavitation.
以下、本発明を図面に示す一実施例に基づいて、さらに
詳細に説明する。Hereinafter, the present invention will be explained in more detail based on an embodiment shown in the drawings.
流量制御弁１は、第１図において左側、第３図及び第４
図において下側を１次側（上流側）にして、管路（図示
せず）に介設される円筒状の弁箱２内に円盤状の弁体３
を、弁箱２下部の中空弁軸４及び上部の回動用弁軸５に
て支持して回動可能に配設している。The flow control valve 1 is located on the left side in FIG. 1, and on the left side in FIGS.
In the figure, the lower side is the primary side (upstream side), and a disc-shaped valve body 3 is placed inside a cylindrical valve box 2 that is interposed in a pipe (not shown).
is rotatably supported by a hollow valve shaft 4 at the bottom of the valve box 2 and a rotating valve shaft 5 at the top.
弁体３には、開弁作動方向の反対側の面、即ち第３図及
び第４図において、弁軸を中心として左側では上流側と
なる下方の面、弁軸の右側では下流側となる上方の面の
周縁部に、それぞれ櫛歯状突起６．７を突設している。The valve body 3 has a surface on the opposite side of the valve opening operation direction, that is, in FIGS. 3 and 4, the lower surface is the upstream side on the left side of the valve stem, and the downstream side is on the right side of the valve stem. Pectine-like protrusions 6 and 7 are respectively provided on the peripheral edge of the upper surface.
この櫛歯状突起６゜７は、キャビテーションの低減を図
るもので、前記従来例で説明したと同様に形成すること
ができる。The comb-like protrusions 6.7 are intended to reduce cavitation, and can be formed in the same manner as described in the conventional example.
そして、本実施例の流量制御弁１においては、弁体１次
側の流体を、パイロット弁８を介して前記中空弁軸４内
に形成した軸方向の流路４ａに導入し、該流路４ａから
弁体２次側に導出するパイロット経路９と、該パイロッ
ト経路９から弁体２次側に導出した流体を弁体２次側の
外周部３ａに案内する案内板１０とを設けている。In the flow control valve 1 of this embodiment, the fluid on the primary side of the valve body is introduced into the axial flow path 4a formed in the hollow valve shaft 4 through the pilot valve 8, and A pilot path 9 leading from the pilot path 9 to the secondary side of the valve body, and a guide plate 10 guiding the fluid led out to the secondary side of the valve body from the pilot path 9 to the outer peripheral part 3a of the secondary side of the valve body are provided. .
上記パイロット経路９は、弁箱２の弁体１次側側壁に開
設した導出口１１から、１次側閉止弁１２、ストレーナ
１３．前記パイロット弁８．圧力計１４及び２次側閉止
弁１５を有する管路１６と、前記中空弁軸４内の流路４
ｍ、該流路４ａの上端と連通する弁体３中央部の流路３
ｂ、該流路３ｂと弁体２次側とを連通するスリット状の
連通路１７とにより構成されている。前記パイロット弁
８は、弁体３が開の状態で、該弁体３と弁箱２との間の
流路、即ち弁体３が小開度の時の負圧発生部の圧力に応
じて１次側の流体を供給するように制御するもので、１
次側の流体を所定圧力に減圧して供給するように構成さ
れている。The pilot path 9 runs from an outlet 11 formed on the primary side wall of the valve body 2 to the primary shutoff valve 12, the strainer 13, and so on. Said pilot valve8. A conduit 16 having a pressure gauge 14 and a secondary shutoff valve 15, and a flow path 4 in the hollow valve shaft 4.
m, flow path 3 in the center of the valve body 3 communicating with the upper end of the flow path 4a;
b, a slit-shaped communication path 17 that communicates the flow path 3b with the secondary side of the valve body. The pilot valve 8 operates in accordance with the pressure of the negative pressure generating part when the valve body 3 is open and the flow path between the valve body 3 and the valve box 2, that is, when the valve body 3 is at a small opening. It controls the supply of fluid on the primary side.
It is configured to reduce the pressure of the next fluid to a predetermined pressure and supply it.
また、上記案内板１０は、板体の両側を折曲した形状に
形成され、弁体３の２次側表面に、該案内板１０と弁体
２次側表面との間に所定断面積の流体流路１８を形成す
るように固定している。Further, the guide plate 10 is formed in a shape in which both sides of the plate body are bent, and a predetermined cross-sectional area is formed between the guide plate 10 and the secondary side surface of the valve body 3 on the secondary side surface of the valve body 3. It is fixed so as to form a fluid flow path 18.
このように流量制御弁１を形成することにより、第４図
に示すように、弁体３の小開度時に、前記パイロット経
路９及び案内板１０を介して１次側の流体を弁体２次側
の外周部３ａに案内することができる。これにより、弁
体外周部３ａと弁箱２との間から２次側に流出する流体
に、該案内板１０からの流体が加えられるので、該部分
で流体が急激に負圧状態になることを防止することがで
き、キャビテーションの発生を抑制することができる。By forming the flow rate control valve 1 in this way, as shown in FIG. It can be guided to the next outer peripheral portion 3a. As a result, the fluid from the guide plate 10 is added to the fluid flowing out to the secondary side from between the outer peripheral part 3a of the valve body 3a and the valve box 2, so that the fluid does not suddenly become in a negative pressure state at this part. can be prevented, and the occurrence of cavitation can be suppressed.
また、１次側の流体の弁体外周部３ａへの供給は、パイ
ロット弁８を介して弁体３両側の流体の圧力差に応じて
行われるので、弁体３の開度に応じてキャビテーション
を抑制するのに必要な量の流体を弁体外周部３ａに導入
することができる。In addition, since the primary side fluid is supplied to the outer circumferential portion 3a of the valve body via the pilot valve 8 in accordance with the pressure difference between the fluids on both sides of the valve body 3, cavitation may occur depending on the opening degree of the valve body 3. It is possible to introduce the amount of fluid required to suppress the above into the outer peripheral portion 3a of the valve body.
尚、上記パイロット経路９及び案内板１ｏの構成、形状
は、弁の大きさ、キャビテーション抑制に必要な流量等
により適宜に設定することができ、中空弁ＩＴｏ ４を
弁箱２に固定して弁体３を回動可能に支持しても、弁体
３に固定して弁箱２に回動可能に軸着してもよい。また
、弁体中央部の流路３ｂを設けずに、中空弁軸４内の流
路４ａに連通する貫通路を中空弁軸４の及び弁体３の２
次側に連通するように形成して流体を導出してもよい。The configuration and shape of the pilot path 9 and the guide plate 1o can be set as appropriate depending on the size of the valve, the flow rate required to suppress cavitation, etc. The hollow valve ITo 4 is fixed to the valve box 2 and the valve The body 3 may be rotatably supported, or may be fixed to the valve body 3 and rotatably pivoted to the valve body 2. In addition, without providing the passage 3b in the center of the valve body, a through passage communicating with the passage 4a in the hollow valve shaft 4 is provided between the two parts of the hollow valve shaft 4 and the valve body 3.
It may be formed so as to communicate with the next side to lead out the fluid.
さらに、弁体外周部３ａ全てに流体を案内導入してもよ
いが、キャビテーションの発生の激しい部分にのみ１次
側流体を導入しても、従来に比べてキャビテーションを
大幅に低減することができる。Furthermore, although fluid may be guided and introduced into the entire outer circumferential portion 3a of the valve body, cavitation can be significantly reduced compared to the conventional method even if the primary fluid is introduced only into the portion where cavitation is most likely to occur. .
加えて、本実施例に示すように、弁体３に櫛歯状突起６
，７を設けることにより、両者の相乗効果でキャビテー
ションの発生をさらに低減させることができる。また、
本実施例では、弁軸を上下方向に設けたが、横方向に設
けても同様の作用効果を得ることができる。In addition, as shown in this embodiment, the valve body 3 is provided with comb-like protrusions 6.
, 7, the occurrence of cavitation can be further reduced due to the synergistic effect of both. Also,
In this embodiment, the valve stem is provided in the vertical direction, but the same effect can be obtained even if it is provided in the horizontal direction.
以上説明したように、本発明の流量制御弁は、弁体１次
側の流体を弁体２次側に案内するパイロット経路と、該
パイロット経路から導出した流体を弁体２次側の外周部
に案内する案内板とを設けたから、弁体の小開度時にキ
ャビテーションの発生する慮のある弁体外周部に１次側
の流体を導入することができ、弁体外周部において流体
が急激に負圧状態になることを防止し、キャビテーショ
ンの発生、及びこれに基因する騒音や振動を大幅に低減
することができる。As explained above, the flow control valve of the present invention has a pilot path that guides the fluid on the primary side of the valve body to the secondary side of the valve body, and a pilot path that guides the fluid on the secondary side of the valve body, and Since a guide plate is provided to guide the valve body, it is possible to introduce the primary fluid to the outer periphery of the valve body where cavitation may occur when the valve body is opened at a small opening, and prevent fluid from suddenly flowing around the outer periphery of the valve body. A negative pressure state can be prevented, and the occurrence of cavitation and the noise and vibration caused by this can be significantly reduced.
図はいずれも本発明の流量制御弁の一実施例を示すもの
で、第１図は断面正面図、第２図は１次側から見た断面
側面図、第３図は弁体を閉じた状態を示す断面平面図、
第４図は弁体を僅かに開いた状態を示す断面平面図であ
る。
１・・・流量制御弁 ２・・・弁箱 ３・・弁体３
ａ・・・弁体外周部 ３ｂ・・・流路 ４・・・中
空弁軸 ４ａ・・・流路 ５・・・回動用弁軸
６，７・・・櫛歯状突起 ８・・・パイロット弁
９・・・パイロット経路 １０・・・案内板 １１
・・・導出口１６・・・管路 １７・・・連通路
浄ｌ圀
１三、茫量＄″ｊ榔弁
第２因。The figures all show one embodiment of the flow control valve of the present invention. Figure 1 is a cross-sectional front view, Figure 2 is a cross-sectional side view seen from the primary side, and Figure 3 is a closed valve body. A cross-sectional plan view showing the condition,
FIG. 4 is a cross-sectional plan view showing a state in which the valve body is slightly opened. 1...Flow control valve 2...Valve box 3...Valve body 3
a... Valve body outer periphery 3b... Flow path 4... Hollow valve shaft 4a... Flow path 5... Rotating valve stem
6, 7...Pectine-shaped projection 8...Pilot valve
9...Pilot route 10...Guidance board 11
...Outlet port 16...Pipeline 17...Communication path 13, volume $''j Sake valve 2nd factor.
Claims (1)
制御弁において、弁体１次側の流体を、パイロット弁を
介して前記弁軸内に形成した軸方向の流路に導入し、該
流路から弁体２次側に導出するパイロット経路を設ける
とともに、該パイロット経路から弁体２次側に導出した
流体を弁体２次側の外周部に案内する案内板を弁体に設
けたことを特徴とする流量制御弁。1. In a flow control valve in which a valve body is rotatably provided in a valve body via a valve stem, the fluid on the primary side of the valve body is controlled by an axial flow formed in the valve stem via a pilot valve. A guide plate that provides a pilot path that is introduced into the flow path and led out from the flow path to the secondary side of the valve body, and guides the fluid led out to the secondary side of the valve body from the pilot path to the outer periphery of the secondary side of the valve body. A flow control valve characterized in that a valve body is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21568789A JPH0379883A (en) | 1989-08-22 | 1989-08-22 | Flow control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21568789A JPH0379883A (en) | 1989-08-22 | 1989-08-22 | Flow control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0379883A true JPH0379883A (en) | 1991-04-04 |
Family
ID=16676494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21568789A Pending JPH0379883A (en) | 1989-08-22 | 1989-08-22 | Flow control valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0379883A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132885A1 (en) | 2011-03-29 | 2012-10-04 | ユニ・チャーム株式会社 | Method for producing pre-moistened wipe package |
-
1989
- 1989-08-22 JP JP21568789A patent/JPH0379883A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132885A1 (en) | 2011-03-29 | 2012-10-04 | ユニ・チャーム株式会社 | Method for producing pre-moistened wipe package |
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