JPS6142154B2 - - Google Patents
Info
- Publication number
- JPS6142154B2 JPS6142154B2 JP14887577A JP14887577A JPS6142154B2 JP S6142154 B2 JPS6142154 B2 JP S6142154B2 JP 14887577 A JP14887577 A JP 14887577A JP 14887577 A JP14887577 A JP 14887577A JP S6142154 B2 JPS6142154 B2 JP S6142154B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve seat
- pressure
- cylinder
- throttle
- 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
- 239000012530 fluid Substances 0.000 description 12
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Lift Valve (AREA)
- Details Of Valves (AREA)
Description
【発明の詳細な説明】
本発明は流量調整弁もしくは圧力調整弁に係
り、特に大流量及び弁が閉じる方向に向つて流れ
る状態（逆流）で使用する玉形弁に於て発生する
キヤビテーシヨン及びその騒音の低減を計つた絞
り弁に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate regulating valve or a pressure regulating valve, and particularly to cavitation that occurs in a globe valve used in a state where the flow is large and the valve is closed (reverse flow). This invention relates to a throttle valve designed to reduce noise.
一般に玉形弁を逆流で使用する場合、弁座絞り
部で流路が狭くなり、流速が増す。よつて過度に
圧力が降下し、弁下流側一定距離に達して始めて
下流側定常圧力まで回復するのが常である。この
ため、弁座絞り部の形状によつて、その圧力が流
体の蒸気圧力以下まで降下する。よつて流体が蒸
発し、気泡が発生する。流体圧力が弁下流側で蒸
気圧力以上に回復した時点で、気泡が凝縮して騒
音及び振動を発生する。いわゆるキヤビテーシヨ
ン現象である。この現象（キヤビテーシヨン）
は、弁及び配管系にエロージヨンを発生し、さら
に異常振動や騒音を生じることにより、好ましく
ない。 Generally, when a globe valve is used for reverse flow, the flow path becomes narrower at the valve seat constriction part, increasing the flow velocity. As a result, the pressure normally drops excessively, and only after reaching a certain distance on the downstream side of the valve does it recover to a steady pressure on the downstream side. Therefore, depending on the shape of the valve seat restrictor, the pressure drops to below the vapor pressure of the fluid. As a result, the fluid evaporates and bubbles are generated. Once the fluid pressure is restored to above the steam pressure downstream of the valve, the bubbles condense and generate noise and vibration. This is a so-called cavitation phenomenon. This phenomenon (cavitation)
This is undesirable because it causes erosion in valves and piping systems, as well as abnormal vibrations and noise.
これを防止するためには、弁座下流側に多孔筒
又は多孔板を設け、抵抗を持たせて、弁座下流側
の圧力を下げて、上述した現象がおきない様な構
造が通常採用されている。しかし弁閉方向の流れ
（逆流）の場合には、弁座部を絞つた状態におい
て、弁座部における圧力降下が過度になるのであ
まり有効でない。 In order to prevent this, a structure is usually adopted in which a perforated cylinder or a perforated plate is provided downstream of the valve seat to provide resistance and reduce the pressure downstream of the valve seat so that the above phenomenon does not occur. ing. However, in the case of flow in the valve closing direction (reverse flow), the pressure drop at the valve seat becomes excessive when the valve seat is constricted, so it is not very effective.
特に流量が大で、しかも弁入口、出口における
圧力差が大きい場合には、多孔筒だけで圧力降下
をさせようとすると穴数（通過総面積）との関係
から所定の流量が得られなくなることが多いた
め、弁座付近での圧力降下を大きくせざるを得な
くなる場合が多い。 Particularly when the flow rate is large and the pressure difference between the valve inlet and outlet is large, if you try to reduce the pressure using only the multi-hole cylinder, you may not be able to obtain the desired flow rate due to the relationship with the number of holes (total passage area). Because of this, it is often necessary to increase the pressure drop near the valve seat.
本発明の目的は、極めて簡単な構造で、弁座部
での過度の圧力降下によるキヤビテーシヨンの発
生を抑制しその安全性を向上せしめた絞り弁を提
供することにある。 An object of the present invention is to provide a throttle valve that has an extremely simple structure, suppresses cavitation due to excessive pressure drop at the valve seat, and improves safety.
以下添付図を参照して本発明の一実施例の説明
をする。 An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明による弁の一実施例を示す断面
図である。 FIG. 1 is a sectional view showing an embodiment of a valve according to the present invention.
両端に配管との接続部を有する弁箱体１内は流
体流路が形成されている。この流体流路には弁座
２が設けられ、該弁座２と締切り時押圧される弁
デイスク３が、電動機１０もしくは手動装置１１
による動力により駆動される弁開閉機構１２によ
つて上下に移動する弁棒４端に設けられている。
前記弁箱体１内の上部流路は中央を前記弁棒４が
貫通する上部カバー５を、又弁箱体１の下部流路
は下部カバー６をボルト１３により止められ構成
されている。前記弁座２部流路内に、その上端が
弁座２部流路内壁で段差を有するよう嵌合され、
下部が前記下部カバー６に着脱可能なようにボル
ト止めされた多孔筒７が取りつけられている。
（孔７ａは断面部分のみ図示する。）
この多孔筒７の側面には多数の孔７ａが設けら
れている。孔７ａの形状は円形が、その加工性、
円滑な流動特性を考慮すると最も良いが、特にこ
れに限定されるものではなく、多角形状、曲線形
状等でも良い。又多孔筒７の形状も円筒、角筒等
特に限定はしない。 A fluid flow path is formed within the valve box body 1 which has connection portions with piping at both ends. A valve seat 2 is provided in this fluid flow path, and the valve seat 2 and a valve disk 3 that is pressed at the time of shutoff are connected to an electric motor 10 or a manual device 11.
It is provided at the 4 ends of the valve stem that moves up and down by the valve opening/closing mechanism 12 driven by the power of the valve.
The upper passage in the valve body 1 is constituted by an upper cover 5 through which the valve rod 4 passes through the center, and the lower passage of the valve body 1 is constituted by the lower cover 6 which is secured by bolts 13. Fitted into the valve seat 2 part flow path so that its upper end has a step on the inner wall of the valve seat 2 part flow path,
A porous cylinder 7 whose lower part is removably bolted to the lower cover 6 is attached.
(Only a cross-sectional portion of the hole 7a is shown.) A large number of holes 7a are provided on the side surface of the porous tube 7. The shape of the hole 7a is circular, but its workability,
It is best if smooth flow characteristics are taken into consideration, but the shape is not particularly limited to this, and polygonal shapes, curved shapes, etc. may also be used. Further, the shape of the porous cylinder 7 is not particularly limited, such as a cylinder or a rectangular cylinder.
次にその作用を説明する。 Next, its effect will be explained.
圧力あるいは流量調整弁は、電動もしくは手動
で駆動される弁棒４端に設けられた弁デイスク３
と、弁座２との間隙をある開度に絞ることによつ
て圧力あるいは流量を調整する。 A pressure or flow regulating valve is a valve disc 3 provided at the end of a valve stem 4 which is electrically or manually driven.
The pressure or flow rate is adjusted by narrowing the gap between the valve seat 2 and the valve seat 2 to a certain degree of opening.
第２図に示す様に弁座２より流れ込んだ流体
は、前記弁座絞り部２ａを通過することにより、
流路を絞られ流速を増すと同時に圧力降下を生じ
る。しかし、弁座２付近で絞られ圧力降下した流
体はその直後、多孔筒７の上端で、嵌合される弁
座２の内壁との段差部７ｂに当ることによつて流
れが不円滑かつ乱れ、流速が減少すると同時に過
度の圧力降下を防ぐことになる。更に多孔筒７内
部の流体圧力は、多孔筒７内部の空間部から孔７
ａを通り、その外部へ流出しにくい（抵抗が大き
い）ため、圧力の回復が出来ることになる。つま
り本発明による絞り弁においては、弁座２内に嵌
合される多孔筒７上端の段差部７ｂによつて、流
れを強制的に乱して流速を減少させることによつ
て多孔筒７内部での過度の圧力降下を防ぐと共
に、該多孔筒７内部から多数の孔７ａを通して下
流側へ流出するのが特徴である。 As shown in FIG. 2, the fluid that has flowed in from the valve seat 2 passes through the valve seat constriction portion 2a, and thereby
The flow path is constricted and the flow velocity increases, at the same time a pressure drop occurs. However, the fluid whose pressure has been reduced by being throttled near the valve seat 2 immediately hits the stepped portion 7b between the inner wall of the valve seat 2 and the fitted valve seat 2 at the upper end of the porous cylinder 7, causing an uneven and turbulent flow. , which will reduce the flow rate and at the same time prevent excessive pressure drop. Furthermore, the fluid pressure inside the porous tube 7 is increased from the space inside the porous tube 7 to the hole 7.
Since it is difficult for the gas to flow out through a (the resistance is large), the pressure can be recovered. In other words, in the throttle valve according to the present invention, the step portion 7b at the upper end of the porous tube 7 fitted into the valve seat 2 forcibly disturbs the flow and reduces the flow velocity. It is characterized in that it prevents an excessive pressure drop in the tube and flows out from the inside of the porous cylinder 7 to the downstream side through a large number of holes 7a.
従来の絞り弁と本発明による絞り弁の弁座絞り
部での圧力挙動を第３図に示す。弁座絞り部上流
側の圧力H1は、ほぼ一定で絞り部やや上流側よ
り絞り部に流入するにつれて急激に圧力は降下す
る。従来の絞り弁においては、その圧力は流体の
蒸気圧力Hv以下にまで降下し、その最低圧力は
絞り部よりやや下流側で発生し、絞り部より下流
に行くに従つて徐々に圧力は回復していた。（第
３図破線ａ）
これに対し本発明による絞り弁では、弁座絞り
部の少し上流側から下降し始めた圧力は、弁座絞
り部のやや下流側で最低となるが、その時の圧力
は流体の蒸気圧力より小さくなることはなく、又
その圧力回復も従来の絞り弁に比べ極めて速い。
（第３図曲線ｂ）
更に両者の騒音を比較する目的で行なつた模擬
実験の結果によれば、弁出口圧力H2と飽和蒸気
圧力Hvの差（H2−Hv）と、弁入口全圧力H1と
H2の差（H1−H2）の比（H2−Hv）／（H1−H2）
で表わされるキヤビテーシヨン係数を同一とし、
かつ流体は常温の水とし、流量約3500T/H、弁
入口、出口の圧力降下約10Kg/cm2ｇとすると、本
発明による段差つき絞り弁の方が騒音レベルで約
数デシベル低くなる結果が得られた。（105デジベ
ルから101デジベルに低下した。）
以上説明したように、弁座部の下流側に前記弁
座より小口径の多孔筒を、その上端部に段差を形
成するよう嵌合させることによつて、弁座絞り部
の過度の圧力降下を防ぐと共に、その圧力回復を
速やかに図るため、弁および配管系を保護し、異
常振動や騒音を低減することが可能である。しか
も、極めて簡単な構造で、しかも、弁デイスクの
ように可動部に設けるのではないため、圧力もし
くは流量の調整も容易で、強度上も好ましい。更
に、下部カバーをはずすことによつて容易に着脱
が可能で、極めて広汎に使用できる。 FIG. 3 shows the pressure behavior at the valve seat throttle portion of a conventional throttle valve and a throttle valve according to the present invention. The pressure H 1 on the upstream side of the valve seat constriction portion is approximately constant, and the pressure drops rapidly as the fluid flows into the constriction portion from a slightly upstream side of the constriction portion. In conventional throttle valves, the pressure drops to below the vapor pressure of the fluid Hv, the lowest pressure occurs slightly downstream of the throttle, and the pressure gradually recovers as you move downstream from the throttle. was. (Dotted line a in Figure 3) On the other hand, in the throttle valve according to the present invention, the pressure that begins to fall slightly upstream of the valve seat throttle reaches its lowest point slightly downstream of the valve seat throttle; does not become lower than the vapor pressure of the fluid, and its pressure recovery is also much faster than with conventional throttle valves.
(Curve b in Figure 3) Furthermore, according to the results of a simulation experiment conducted for the purpose of comparing the noise between the two, the difference between the valve outlet pressure H2 and the saturated steam pressure Hv ( H2 - Hv) and the valve inlet total Pressure H 1 and
Ratio of H 2 difference (H 1 − H 2 ) (H 2 − Hv)/(H 1 − H 2 )
Assuming that the cavitation coefficients expressed by are the same,
In addition, assuming that the fluid is water at room temperature, the flow rate is approximately 3500 T/H, and the pressure drop at the valve inlet and outlet is approximately 10 Kg/cm 2 g, the noise level of the stepped throttle valve according to the present invention is approximately several decibels lower. Obtained. (It decreased from 105 decibels to 101 decibels.) As explained above, by fitting a porous cylinder with a smaller diameter than the valve seat on the downstream side of the valve seat so as to form a step at its upper end. Therefore, it is possible to prevent an excessive pressure drop in the valve seat constriction portion and to quickly recover the pressure, thereby protecting the valve and piping system and reducing abnormal vibrations and noise. Moreover, it has an extremely simple structure, and since it is not provided in a movable part like a valve disk, it is easy to adjust the pressure or flow rate, and it is also preferable in terms of strength. Furthermore, it can be easily attached and detached by removing the lower cover, making it extremely versatile.
第１図は本発明による絞り弁の一実施例を示す
断面図、第２図は本発明にかかる弁座部を拡大し
て示す断面図、第３図は本発明による絞り弁の流
動特性を示す特性図である。
１……弁箱体、２……弁座、３……弁デイス
ク、４……弁棒、５……上部カバー、６……下部
カバー、７……多孔筒、７ａ……孔、７ｂ……段
差部。
FIG. 1 is a cross-sectional view showing an embodiment of the throttle valve according to the present invention, FIG. 2 is a cross-sectional view showing an enlarged view of the valve seat portion according to the present invention, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve seat, 3... Valve disk, 4... Valve stem, 5... Upper cover, 6... Lower cover, 7... Porous cylinder, 7a... Hole, 7b... ...Step part.
Claims (1)
この弁座に当接する弁デイスクと、この弁デイス
クの弁閉動作時の移動方向側に設けられ側部に多
数の孔を有する多孔筒と、この多孔筒と上記弁座
との間の環状流路に乱流を発生させる段差部とを
具備してなる絞り弁。 ２ 上記多孔筒は弁箱に取り付けられた下部カバ
ーにより支持されてなることを特徴とする特許請
求の範囲第１項記載の絞り弁。 ３ 上記多孔筒は円筒であることを特徴とする特
許請求の範囲第１項または第２項記載の絞り弁。 ４ 上記多孔筒の直径は上記弁座の直径より小で
あることを特徴とする特許請求の範囲第３項記載
の絞り弁。[Claims] 1. A valve box, a valve seat provided inside the valve box,
A valve disk that comes into contact with the valve seat, a multi-hole cylinder provided on the side in the movement direction of the valve disk during the valve closing operation and having a large number of holes on the side, and an annular flow between the multi-hole cylinder and the valve seat. A throttle valve comprising a stepped portion that generates turbulent flow in a passage. 2. The throttle valve according to claim 1, wherein the porous cylinder is supported by a lower cover attached to the valve box. 3. The throttle valve according to claim 1 or 2, wherein the porous cylinder is a cylinder. 4. The throttle valve according to claim 3, wherein the diameter of the perforated cylinder is smaller than the diameter of the valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14887577A JPS5482720A (en) | 1977-12-13 | 1977-12-13 | Throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14887577A JPS5482720A (en) | 1977-12-13 | 1977-12-13 | Throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5482720A JPS5482720A (en) | 1979-07-02 |
| JPS6142154B2 true JPS6142154B2 (en) | 1986-09-19 |
Family
ID=15462667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14887577A Granted JPS5482720A (en) | 1977-12-13 | 1977-12-13 | Throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5482720A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62288787A (en) * | 1986-06-03 | 1987-12-15 | Mitsubishi Heavy Ind Ltd | Low noise valve |
| JPH0745920B2 (en) * | 1987-06-23 | 1995-05-17 | 三井石油化学工業株式会社 | Condensate discharge device |
| JP5378540B2 (en) * | 2008-12-22 | 2013-12-25 | アルテミス インテリジェント パワー リミティド | Valve assembly |
-
1977
- 1977-12-13 JP JP14887577A patent/JPS5482720A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5482720A (en) | 1979-07-02 |
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