JPH024923B2 - - Google Patents
Info
- Publication number
- JPH024923B2 JPH024923B2 JP2103883A JP2103883A JPH024923B2 JP H024923 B2 JPH024923 B2 JP H024923B2 JP 2103883 A JP2103883 A JP 2103883A JP 2103883 A JP2103883 A JP 2103883A JP H024923 B2 JPH024923 B2 JP H024923B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pressure
- pipe line
- cylinder
- port
- 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
- 230000007423 decrease Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 40
- 238000012856 packing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/02—Modifications to reduce the effects of instability, e.g. due to vibrations, friction, abnormal temperature, overloading or imbalance
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
Description
【発明の詳細な説明】
この発明は漏水防止用の減圧弁に関するもので
あり、特にピストン型の主弁の開閉作動を複数個
のパイロツト弁によつて制御する減圧弁に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure reducing valve for preventing water leakage, and more particularly to a pressure reducing valve in which the opening and closing operations of a piston-type main valve are controlled by a plurality of pilot valves.
従来のこの種の減圧弁としては、特開昭55−
20939号公報に記載のものが存在する。しかしこ
の減圧弁は、水の使用量が多い場合にも２次側の
圧力が主弁の作動室にかかつているために、主弁
を全開位置に保持することができないので送出量
を一定量以上に増加させることが出来なかつた。
また管路の圧力が直接作動室に作用するようにな
つていたために、水の使用量の変化や脈流による
管路の圧力変動に対する反応が敏感で、主弁の開
閉動作が急激になつて、振動や騒音が発生しやす
く、通水中管路の修理等によつて下流の弁が閉鎖
されたような場合には、主弁が弁口を急速に閉鎖
するので、ウオーターハンマが発生するおそれが
あつた。 As a conventional pressure reducing valve of this type, there is a
There is one described in Publication No. 20939. However, with this pressure reducing valve, even when the amount of water used is large, the pressure on the secondary side is applied to the working chamber of the main valve, so the main valve cannot be held in the fully open position, so the amount of water delivered is limited to a fixed amount. It was not possible to increase it further.
In addition, because the pressure in the pipeline was now acting directly on the working chamber, the reaction to changes in the amount of water used and pressure fluctuations in the pipeline due to pulsating flow was sensitive, and the opening and closing operations of the main valve became rapid. , vibration and noise are likely to occur, and if the downstream valve is closed due to repairs to the water flow pipe, the main valve will quickly close the valve port, which may cause water hammer. It was hot.
この発明は上記従来の減圧弁のもつ欠点を解消
し、振動や騒音の発生が少なくまたウオータハン
マの発生の虞れのない減圧弁を提供することを目
的とするものである。 The object of the present invention is to eliminate the drawbacks of the conventional pressure reducing valves mentioned above, and to provide a pressure reducing valve that generates less vibration and noise and is free from the risk of water hammer.
以下図面に示す実施例に基づいて説明を行う。 The following description will be made based on the embodiments shown in the drawings.
第１図は例えば夜間のように水の使用量が少な
い場合の減圧状態を、第２図は昼間のように水の
使用量が多い場合の全開放の状態を示すものであ
る。 FIG. 1 shows a reduced pressure state when the amount of water used is small, such as at night, and FIG. 2 shows a fully open state when the amount of water used is large, such as during the day.
第１および２図において、弁箱１には弁入口側
管路２および弁出口側管路３が接続され、水は開
口４から流入し、弁箱内開口部５を経て開口６か
ら流出するようになつている。弁体７の下端には
閉鎖時、弁箱弁座８と密接する弁体弁座９とガイ
ド１０が設けられ、このガイド１０が開口部５に
遊嵌されて、弁体７が弁箱弁座８に対し上下動自
在となつている。そして弁箱弁座８と弁体弁座９
との間に弁口１１が形成される。 In FIGS. 1 and 2, a valve inlet pipe line 2 and a valve outlet pipe line 3 are connected to a valve box 1, and water flows in through an opening 4, passes through an opening 5 in the valve box, and flows out through an opening 6. It's becoming like that. A valve seat 9 and a guide 10 are provided at the lower end of the valve body 7, which come into close contact with the valve seat 8 of the valve box when closed. It is movable up and down relative to the seat 8. And the valve box valve seat 8 and the valve body valve seat 9
A valve port 11 is formed between the two.
弁箱１の上端には蓋１２が固着され、さらに弁
箱１と蓋１２との間には、弁体７の外径よりも内
径の大きいシリンダ１３の上端の外フランジ部１
４が挾持されていて、弁体７がシリンダ１３内に
遊嵌された状態となつている。また弁箱１の内壁
に取り付けられたパツキン１５が弁体７の外周面
に摺接され、また弁体７の上端に取り付けられた
パツキン１６がシリンダ１３の内周面に摺接され
ており、これによつてシリンダ１３内の圧力P0
が弁体７の内側に、弁入口側圧力（１次側圧力）
P1が弁体７の弁口側に作用するようになつてい
る。 A lid 12 is fixed to the upper end of the valve body 1, and an outer flange 1 at the upper end of the cylinder 13, which has an inner diameter larger than the outer diameter of the valve body 7, is located between the valve body 1 and the lid 12.
4 is clamped, and the valve body 7 is loosely fitted into the cylinder 13. Further, a packing 15 attached to the inner wall of the valve body 1 is in sliding contact with the outer circumferential surface of the valve body 7, and a packing 16 attached to the upper end of the valve body 7 is in sliding contact with the inner circumferential surface of the cylinder 13. As a result, the pressure inside the cylinder 13 P 0
is inside the valve body 7, the valve inlet side pressure (primary side pressure)
P1 acts on the valve port side of the valve body 7.
弁体７の底部上面には連通孔１７を有する連通
管１８が立設されており、この連通管１８は弁体
７が上昇して弁口１１が全開放された際、その上
端縁が蓋１２の中央部に穿設された貫通孔１９の
下端開口部周縁に取り付けられたパツキン２０に
密着されて連通孔１７と貫通孔２０とが連通さ
れ、従つて貫通孔１９と弁体７の弁口側とが連通
されるようになつており、弁体７が下降して弁口
１１が全開放時に比べて開口面積が減少している
状態では、連通管１８の上端がパツキン２０から
離れ、従つてシリンダ１３内と弁体７の弁口側と
が連通されるようになつている。 A communication pipe 18 having a communication hole 17 is erected on the upper surface of the bottom of the valve body 7, and when the valve body 7 is raised and the valve port 11 is fully opened, the upper edge of the communication pipe 18 is connected to the lid. The communication hole 17 and the through hole 20 are in close contact with the gasket 20 attached to the lower end opening periphery of the through hole 19 bored in the center of the valve 12, and the through hole 19 and the valve of the valve body 7 are in close contact with each other. When the valve body 7 is lowered and the opening area of the valve port 11 is reduced compared to when the valve port 11 is fully open, the upper end of the communication pipe 18 is separated from the gasket 20. Therefore, the inside of the cylinder 13 and the valve port side of the valve body 7 are communicated with each other.
弁箱１の底部上面には、先端がテーパ状になつ
たニードル２１が立設され、このニードル２１の
先端部が連通孔１７の下端開口部（以下小径弁口
２２という）から連通孔１７内に挿入され、弁体
７の上下動に伴つて小径弁口２２の開口面積が変
化（弁体５が上昇するに従つて開口面積が大、弁
体５が下降するに従つて開口面積が小）するよう
になつている。また蓋１２の上面には集合管２３
が、その内部を貫通孔１９と連連通された状態で
立設されている。 A needle 21 with a tapered tip is erected on the bottom upper surface of the valve box 1, and the tip of the needle 21 is inserted into the communication hole 17 from the lower end opening of the communication hole 17 (hereinafter referred to as the small diameter valve port 22). The opening area of the small diameter valve port 22 changes as the valve body 7 moves up and down (the opening area increases as the valve body 5 rises, and the opening area decreases as the valve body 5 descends). ). In addition, a collecting pipe 23 is provided on the top surface of the lid 12.
is erected with its interior communicating with the through hole 19.
パイロツト弁Ａは管３１によつて集合管２３
と、管３２によつて弁出口側（２次側）、すなわ
ち開口６側とそれぞれ接続されており、弁体３３
がベロフラム３４に一体的に取り付けられてベロ
フラム３４の作動に伴つて上下して、弁口３５を
開閉するようになつている。そして弁出口側圧力
（２次側圧力）P2がベロフラム３４の下面に作用
して弁体３３が弁口３５を閉鎖する方向に付勢す
るようになつており、またパイロツト弁Ａの弁箱
３６とベロフラム３４の間に介装されたばね３７
がベロフラム３４の上面を下方向に押圧して、弁
体３３が弁口３５を開放する方向に付勢してい
る。またばね３７の押圧力は弁箱３６の上端面に
螺設された調整ボルト３８によつて調整可能とな
つている。また管３１と管３２とは弁口３５を介
して連通されている。 Pilot valve A is connected to collector pipe 23 by pipe 31.
and the valve outlet side (secondary side), that is, the opening 6 side, by a pipe 32, and the valve body 33
is integrally attached to the bellofram 34 and moves up and down as the bellofram 34 operates to open and close the valve port 35. Then, the valve outlet side pressure (secondary side pressure) P2 acts on the lower surface of the bellofram 34, urging the valve body 33 in a direction to close the valve port 35, and the valve body of the pilot valve A. Spring 37 interposed between 36 and bellofram 34
presses the upper surface of the bellofram 34 downward, thereby urging the valve body 33 in a direction to open the valve port 35. Further, the pressing force of the spring 37 can be adjusted by an adjustment bolt 38 threaded onto the upper end surface of the valve box 36. Further, the pipe 31 and the pipe 32 are communicated through a valve port 35.
パイロツト弁Ｂは、管４１によつて集合管２３
と、管４２によつて弁入口側（１次側）、すなわ
ち開口４側と、管４３によつてシリンダ１３内と
それぞれ接続されており、弁体４４がベロフラム
４５に１体的に取り付けられてベロフラム４５の
作動に伴つて上下動して、弁口４６を開閉するよ
うになつている。そして１次側圧力P1がベロフ
ラム４５の下面にのみ作用して弁体４４が弁口４
６を開放する方向に付勢するようになつており、
またパイロツト弁Ｂの弁箱４７とベロフラム４５
の間に介装されたばね４８がベロフラム４５の上
面を下方向に押圧して弁体４４が弁口４６を閉鎖
する方向に付勢している。またばね４８の押圧力
は弁箱４７の上端面に螺設された調整ボルト４９
によつて調整可能となつている。管４１と管４３
とは弁口４６を介して連通されている。 The pilot valve B is connected to the collecting pipe 23 by a pipe 41.
The valve inlet side (primary side), that is, the opening 4 side, is connected to the inside of the cylinder 13 by a pipe 43, and the valve body 44 is integrally attached to the bellofram 45. The valve opening 46 is moved up and down in accordance with the operation of the bellow ram 45 to open and close the valve port 46. Then, the primary side pressure P1 acts only on the lower surface of the bellofram 45, and the valve body 44
6 in the direction of opening,
Also, the valve box 47 and bellofram 45 of pilot valve B
A spring 48 interposed therebetween presses the top surface of the bellow ram 45 downward, urging the valve element 44 in a direction to close the valve port 46. The pressing force of the spring 48 is determined by an adjustment bolt 49 screwed onto the upper end surface of the valve box 47.
It can be adjusted by pipe 41 and pipe 43
is communicated with through a valve port 46.
パイロツト弁Ｃは管５１によつて管４３と、管
５２によつて管４２と放出管５３によつて大気と
それぞれ接続されており、弁体５４がベロフラム
５５に一体的に取り付けられてベロフラム５５の
作動に伴つて上下動して、弁口５６を開閉するよ
うになつている。そして１次側圧力P1がベロフ
ラム５５の下面にのみ作用して弁体５４が弁口５
６を閉鎖する方向に付勢するようになつており、
またパイロツト弁Ｂの弁箱５７とベロフラム５５
の間に介装されたばね５８がベロフラム５５の上
面を下方向に押圧して弁体５４が弁口５６を開放
する方向に付勢している。またばね５８の押圧力
は弁箱５７の上端面に螺設された調整ボルト５９
によつて調整可能となつている。さらに管５１と
放出管５３とは弁口５６を介して連通されてい
る。 The pilot valve C is connected to the atmosphere by a pipe 51 and a pipe 43, a pipe 52 and a discharge pipe 53, respectively, and a valve body 54 is integrally attached to a bellofram 55. The valve opening 56 is moved up and down in response to the operation of the valve 56 to open and close the valve port 56. Then, the primary side pressure P1 acts only on the lower surface of the bellofram 55, and the valve body 54 moves to the valve port 5.
6 in the direction of closing,
Also, the valve box 57 and bellofram 55 of pilot valve B
A spring 58 interposed therebetween presses the upper surface of the bellofram 55 downward, thereby urging the valve element 54 in a direction to open the valve port 56. The pressing force of the spring 58 is determined by an adjustment bolt 59 screwed onto the upper end surface of the valve box 57.
It can be adjusted by Further, the pipe 51 and the discharge pipe 53 are communicated via a valve port 56.
上記パイロツト弁Ａ、Ｂ、Ｃの設定圧は以下の
ように設定されている。 The set pressures of the pilot valves A, B, and C are set as follows.
パイロツト弁Ａの設定圧PAは水の使用量の少
ない夜間におけるような減圧状態の２次側圧力
P2とほぼ等しくされ、第１図の減圧状態におい
て弁体３３が中間開度の状態でバランスするよう
に設定されている。この設定圧PAは、管路外へ
の漏水を少なくするように、夜間の水の使用量や
消防用の水圧、管路抵抗などを考慮して設定され
る。 The set pressure P A of the pilot valve A is the secondary pressure in a reduced pressure state such as at night when the amount of water used is low.
P2 , and is set so that the valve body 33 is balanced at an intermediate opening degree in the reduced pressure state shown in FIG. This set pressure P A is set in consideration of the amount of water used at night, water pressure for firefighting, pipe resistance, etc., so as to reduce water leakage to the outside of the pipe.
パイロツト弁Ｂおよびパイロツト弁Ｃの設定圧
PB，PCは等しく、水の使用量の多い例えば昼間
におけるような主弁の全開放時の１次側圧力P1
が降下して送水量が不足し始める圧力よりも少し
高めに設定されている。 Set pressure of pilot valve B and pilot valve C
P B and P C are equal, and the primary side pressure P 1 when the main valve is fully open, such as during the daytime when the amount of water used is large.
The pressure is set slightly higher than the pressure at which the water flow rate begins to drop and the amount of water supplied becomes insufficient.
上記減圧弁の作動は以下の通りである。 The operation of the pressure reducing valve described above is as follows.
第１図の水の使用量が少なく１次側圧力P1が
パイロツト弁Ｂ、Ｃの設定圧PB、PCよりも高い
（P1＞PB，PC）場合において、１次側圧力P1によ
りパイロツト弁Ｂは開放、パイロツト弁Ｃは閉鎖
されている。そして弁体７は中間位置に位置して
弁口１１が中間開度の状態となつており、この状
態で管路２から開口４に流入した水は弁口１１を
経て開口６から管路３に流出するとともに、一部
は小径弁口２２からシリンダ１３−集合管２３―
管３１を経てパイロツト弁Ａ内に流入し、このと
きパイロツト弁Ａはその設定圧P21と２次側圧力
P2とがバランスして中間開度の状態となつてお
り、パイロツト弁Ａ内に流入した水は弁口３３―
管３２を経て開口６から管路３に流出する。 When the amount of water used in Figure 1 is small and the primary pressure P 1 is higher than the set pressures P B and P C of pilot valves B and C (P 1 > P B , P C ), the primary pressure P1 opens pilot valve B and closes pilot valve C. The valve body 7 is located at an intermediate position, and the valve port 11 is in an intermediate opening state. In this state, water flowing into the opening 4 from the pipe line 2 passes through the valve port 11 and flows from the opening 6 to the pipe line 3. At the same time, some of it flows out from the small diameter valve port 22 into the cylinder 13 - collecting pipe 23 -
It flows into the pilot valve A through the pipe 31, and at this time, the pilot valve A has its set pressure P 21 and the secondary pressure.
P2 is balanced and the opening is at an intermediate position, and the water flowing into the pilot valve A flows through the valve port 33-
It flows out of the opening 6 into the line 3 via the pipe 32.
上記状態からさらに水の使用量が減少して２次
側圧力P2がパイロツト弁Ａの設定圧力PAよりも
上昇（P2＞PA）すると、２次側圧力P2がベロフ
ラム３４に作用して弁体３３が上方向に移動さ
れ、弁口３５の開口面積が減少される。この弁口
３５の開口面積の減少によりシリンダ１３内の圧
力水の弁口３５を経て流出する流出量が絞られ、
このことによりシリンダ１３内の圧力P0が上昇
し、この圧力P0が弁体７の内側（下向き）に作
用するので、径違いのピストンの役割をする弁体
７が弁口１１を閉鎖する方向に移動させる。この
ことにより弁口１１の開口面積が絞られ弁口１１
からの流出量が低下するので、２次側圧力P2が
パイロツト弁Ａの設定圧PAまで減少されて維持
される。 When the amount of water used further decreases from the above state and the secondary pressure P 2 rises higher than the set pressure P A of the pilot valve A (P 2 > P A ), the secondary pressure P 2 acts on the bellofram 34. The valve body 33 is moved upward, and the opening area of the valve port 35 is reduced. Due to this reduction in the opening area of the valve port 35, the amount of pressure water flowing out through the valve port 35 in the cylinder 13 is restricted.
As a result, the pressure P 0 inside the cylinder 13 increases, and this pressure P 0 acts on the inside (downward) of the valve body 7, so the valve body 7, which functions as a piston with a different diameter, closes the valve port 11. move in the direction. As a result, the opening area of the valve port 11 is narrowed down, and the valve port 11
Since the outflow amount from the pilot valve A decreases, the secondary side pressure P 2 is reduced to the set pressure P A of the pilot valve A and maintained.
次に上記状態から２次側圧力P2が減少してパ
イロツト弁Ａの設定圧PAよりも下降すると、ば
ね３７がベロフラム３４を押圧して弁体３３を押
し下げ、弁口３５の開口面積を拡大させる。従つ
て弁口３５からのシリンダ１３内の圧力水の流出
量が増加しシリンダ１３内の圧力P0が減少する
ので、弁体が弁口１１を開放する方向（上方向）
に移動される。このことにより弁口１１の開口面
積が拡大され水の流出量が増加するので、２次側
圧力P2がパイロツト弁Ａの設定圧PAまで上昇さ
れて維持される。 Next, when the secondary pressure P 2 decreases from the above state and falls below the set pressure P A of the pilot valve A, the spring 37 presses the bellow ram 34 and pushes down the valve body 33, reducing the opening area of the valve port 35. Expand. Therefore, the amount of pressure water flowing out of the cylinder 13 from the valve port 35 increases and the pressure P 0 in the cylinder 13 decreases, so that the direction in which the valve body opens the valve port 11 (upward)
will be moved to This expands the opening area of the valve port 11 and increases the amount of water flowing out, so that the secondary pressure P2 is raised to the set pressure PA of the pilot valve A and maintained.
次に第１図の減圧状態から、水の使用量が増大
して１次側圧力P1が減少し、パイロツト弁Ｂ，
Ｃの設定圧PB、PCよりも下降すると、ばね４８，
５８がベロフラム４５，５５をそれぞれ押圧して
パイロツト弁Ｂは閉鎖、パイロツト弁Ｃは開放さ
れる。従つてシリンダ１３内は管４３―管５１―
弁口５６―放出管５３を経て大気と連通されてシ
リンダ１３内の圧力P0がほぼ大気圧まで下降さ
れるので、弁体７はその弁口側に作用する一次側
圧力P1によつて付勢されて上方に移動され、連
通管１８の上端がパツキン２０に密着され、弁口
１１が全開放されて第２図の状態に移行される。
このときパイロツト弁Ｂは閉鎖され、また連通孔
１７とシリンダ１３の内部とは遮断されているの
で、連通管１８内の圧力水が放出管５３から流出
することはほとんどなく、放出管３５からは弁体
７の上方向への移動に伴つて、シリンダ１３内に
あつた水がわずかに流出されるのみであつて、弁
口１１が全開放された後は送水によつて放出管５
３から水が流出することはない。 Next, from the reduced pressure state shown in Figure 1, the amount of water used increases and the primary pressure P1 decreases, causing the pilot valve B,
When the set pressure P B and P C of C are lowered, the spring 48,
58 presses the bellophrams 45 and 55, respectively, so that the pilot valve B is closed and the pilot valve C is opened. Therefore, the inside of the cylinder 13 is a pipe 43 - a pipe 51 -
The valve body 7 is communicated with the atmosphere via the valve port 56 and the discharge pipe 53, and the pressure P 0 inside the cylinder 13 is lowered to almost atmospheric pressure, so that the valve body 7 is caused to react by the primary side pressure P 1 acting on the valve port side. It is energized and moved upward, the upper end of the communication pipe 18 is brought into close contact with the gasket 20, and the valve port 11 is fully opened to shift to the state shown in FIG. 2.
At this time, the pilot valve B is closed and the communication hole 17 is cut off from the inside of the cylinder 13, so the pressure water in the communication pipe 18 hardly flows out from the discharge pipe 53, and from the discharge pipe 35. As the valve body 7 moves upward, the water in the cylinder 13 is only slightly discharged, and after the valve port 11 is fully opened, water is supplied to the discharge pipe 5.
No water will flow out from 3.
第２図の弁口１１が全開放されている状態にお
いて、水の使用量が減少して１次側圧力P1が上
昇しパイロツト弁Ｂ、Ｃの設定圧PB、PC以上に
なると、この１次側圧力P1がベロフラム４５お
よび５５を押し上げて、パイロツト弁Ｂを開放
し、パイロツト弁Ｃを閉鎖する。そして圧力水が
小径弁口２２―連通管１８―集合管２３―管４１
―弁口４６―管４３を経てシリンダ１３内に流入
することにより、シリンダ１３内の圧力P0が上
昇して弁体７を押圧して下方向に移動させ、連通
管１８の上端がパツキン２０から離間して連通孔
１７とシリンダ１３内とが連通して、第１図の減
圧状態に移行される。従つて弁口１１の開口面積
が絞られることにより弁口１１からの水の流出量
が減少され、２次側圧力P2が減少されるもので
ある。 In the state where the valve port 11 in Fig. 2 is fully opened, when the amount of water used decreases and the primary side pressure P 1 rises and exceeds the set pressures P B and P C of the pilot valves B and C , This primary side pressure P1 pushes up the bellophrams 45 and 55, opens the pilot valve B, and closes the pilot valve C. Then, the pressure water flows from the small diameter valve port 22 to the communication pipe 18 to the collecting pipe 23 to the pipe 41.
- Valve port 46 - By flowing into the cylinder 13 through the pipe 43, the pressure P 0 in the cylinder 13 rises and presses the valve body 7 to move it downward, so that the upper end of the communication pipe 18 touches the gasket 20. The communication hole 17 and the inside of the cylinder 13 communicate with each other at a distance from the cylinder 13, and the pressure is reduced to the reduced pressure state shown in FIG. Therefore, by narrowing the opening area of the valve port 11, the amount of water flowing out from the valve port 11 is reduced, and the secondary side pressure P2 is reduced.
また通水中において管路の修理などで下流の弁
を閉鎖した場合に、１次側圧力P1が上昇し、圧
力水が小径弁口２２―連通管１８―集合管２３―
管４１―弁口４６―管４３を経てシリンダ１３内
に流入され、または連通管１８の上端がパツキン
２０から離間した後は連通管１８から直接シリン
ダ１３内に流入されてシリンダ１３内の圧力P0
が上昇され、弁体７が押圧されて下方向に移動さ
れることにより、弁口１１が閉鎖される。このと
き、小径弁口２２はニードル弁２１によつて、弁
体７が下方向に移動されるに従つてその開口面積
を除々に減少されるので、弁体７の移動速度は弁
体７が下降するに従つて緩やかになり、このこと
により弁体弁座９は弁箱弁座８に緩やかに密接す
る。従つて下流の弁の急閉鎖等によつてウオータ
ハンマが発生する虞れはない。 In addition, when the downstream valve is closed due to pipe repair etc. while water is flowing, the primary pressure P 1 increases and the pressure water flows from the small diameter valve port 22 to the communication pipe 18 to the collecting pipe 23
It flows into the cylinder 13 through the pipe 41, the valve port 46, and the pipe 43, or after the upper end of the communication pipe 18 is separated from the packing 20, it flows directly into the cylinder 13 from the communication pipe 18, and the pressure inside the cylinder 13 is reduced. 0
is raised, and the valve body 7 is pressed and moved downward, thereby closing the valve port 11. At this time, the opening area of the small diameter valve port 22 is gradually reduced by the needle valve 21 as the valve body 7 is moved downward. As it descends, it becomes gentler, and as a result, the valve body valve seat 9 gradually comes into close contact with the valve body valve seat 8. Therefore, there is no risk of water hammer occurring due to sudden closing of downstream valves, etc.
この考案は前記のように構成したことにより、
水の使用量が増大した場合に減圧弁のシリンダ内
が大気に連通されてシリンダ内が大気圧まで減圧
されるので、主弁を全開放して送水量を最大まで
増加させることができ、また主弁に設けられたニ
ードル弁によつて、管路の圧力変動に伴う主弁の
開閉動作によつて振動や騒音が発生する虞れがな
く、また下流の弁の閉鎖等によつてウオータハン
マが発生する虞れがないという優れた効果を有す
るものである。 By configuring this idea as described above,
When the amount of water used increases, the inside of the cylinder of the pressure reducing valve is communicated with the atmosphere and the pressure inside the cylinder is reduced to atmospheric pressure, so the main valve can be fully opened and the amount of water sent can be increased to the maximum. With the needle valve installed in the main valve, there is no risk of vibration or noise occurring due to the opening and closing operations of the main valve due to pressure fluctuations in the pipeline, and there is no risk of water hammer occurring due to the closing of downstream valves. This has an excellent effect in that there is no risk of occurrence.
第１図はこの考案の一実施例を送水量の少ない
減圧状態で示す説明図、第２図は同実施例を送水
量の多い主弁の全開状態で示す説明図である。
１…弁箱、４…開口、５…開口、７…弁体、１
１…弁口、１３…シリンダ、１８…連通管、２１
…ニードル、２２…小径弁口、３１，３２，４
１，４２，４３，５１，５２，５３…管、Ａ，
Ｂ，Ｃ…パイロツト弁。
FIG. 1 is an explanatory diagram showing an embodiment of this invention in a reduced pressure state with a small amount of water being fed, and FIG. 2 is an explanatory diagram showing the same embodiment in a fully open state with the main valve having a large amount of water being conveyed. 1... Valve box, 4... Opening, 5... Opening, 7... Valve body, 1
1...Valve port, 13...Cylinder, 18...Communication pipe, 21
...Needle, 22...Small diameter valve port, 31, 32, 4
1, 42, 43, 51, 52, 53...pipe, A,
B, C...Pilot valve.
Claims (1)
るようになつている弁体に、シリンダ内と弁箱の
弁口とを連通する小径弁口が設けられ、この小径
弁口に弁箱に取り付けられたニードルの先端が弁
体の弁口側から挿入されて、弁体の往復動に伴つ
て小径弁口の開口面積が変化するようになつてお
り、前記シリンダに連通された第１管路と、前記
弁箱の弁出口側に連通された第２管路との接続部
に第１パイロツト弁が設置され、この第１パイロ
ツト弁は弁箱の弁出口側の圧力によつて作動し、
該弁出口側の圧力が所定の圧力に減圧された際、
中間開度の状態で第１管路と第２管路とを連通す
るようになつているとともに、弁入口側の圧力が
前記所定の圧力よりも増加すると閉鎖方向に、減
少すると開放方向に作動するようになつており、
共に前記シリンダに連通された第３管路と第４管
路との接続部に第２パイロツト弁が設置され、こ
の第２パイロツト弁は弁箱の弁入口側の圧力によ
つて作動し、該弁入口側の圧力が所定の圧力より
も高くなつた際開放されて、第３管路と第４管路
とを連通するようになつており、前記シリンダに
連通された第５管路と大気に連通された第６管路
との接続部に第３パイロツト弁が設置され、この
第３パイロツト弁は弁箱の弁入口側の圧力によつ
て作動し、該弁入口側の圧力が前記第２パイロツ
ト弁と同じ所定の圧力よりも低くなつた際開放さ
れて、第５管路と第６管路とを連通させるように
なつており、前記弁体の内側の前記小径弁口の周
囲に立壁が立設され、この立壁が、弁箱の弁口が
全開放された際、小径弁口とシリンダ内部とを遮
断するとともに、立壁の先端が第５管路の前記シ
リンダ内開口部周縁に密接されるようになつてい
ることを特徴とする減圧弁。1. A small-diameter valve port that communicates between the inside of the cylinder and the valve port of the valve box is provided on a valve body that reciprocates inside the cylinder to open and close the valve port of the valve box. The tip of a needle attached to the box is inserted from the valve port side of the valve body, and the opening area of the small diameter valve port changes as the valve body reciprocates. A first pilot valve is installed at the connection between the first pipe line and a second pipe line communicating with the valve outlet side of the valve box, and the first pilot valve is operated by pressure on the valve outlet side of the valve box. operates,
When the pressure on the valve outlet side is reduced to a predetermined pressure,
The first pipe line and the second pipe line communicate with each other in an intermediate opening state, and when the pressure on the valve inlet side increases than the predetermined pressure, it operates in the closing direction, and when it decreases, it operates in the opening direction. It has come to be that
A second pilot valve is installed at the connection between the third pipe line and the fourth pipe line, both of which communicate with the cylinder, and this second pilot valve is operated by pressure on the valve inlet side of the valve box. When the pressure on the inlet side of the valve becomes higher than a predetermined pressure, the valve is opened and the third pipe line and the fourth pipe line are communicated with each other, and the fifth pipe line communicated with the cylinder is connected to the atmosphere. A third pilot valve is installed at the connection point with the sixth pipe line communicating with the valve body, and this third pilot valve is operated by the pressure on the valve inlet side of the valve box, and the pressure on the valve inlet side is equal to the pressure on the valve inlet side. When the pressure becomes lower than the same predetermined pressure as the second pilot valve, it is opened to connect the fifth pipe line and the sixth pipe line, and the valve body is provided with a valve around the small diameter valve port inside the valve body. A vertical wall is provided, and when the valve port of the valve box is fully opened, the vertical wall blocks the small-diameter valve port from the inside of the cylinder, and the tip of the vertical wall is connected to the periphery of the opening in the cylinder of the fifth conduit. A pressure reducing valve characterized in that the valve is adapted to be tightly closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2103883A JPS59146314A (en) | 1983-02-10 | 1983-02-10 | Pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2103883A JPS59146314A (en) | 1983-02-10 | 1983-02-10 | Pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59146314A JPS59146314A (en) | 1984-08-22 |
| JPH024923B2 true JPH024923B2 (en) | 1990-01-31 |
Family
ID=12043777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2103883A Granted JPS59146314A (en) | 1983-02-10 | 1983-02-10 | Pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59146314A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2782010B2 (en) * | 1989-12-08 | 1998-07-30 | 前澤工業株式会社 | Pressure reducing valve |
-
1983
- 1983-02-10 JP JP2103883A patent/JPS59146314A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59146314A (en) | 1984-08-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3211174A (en) | Pressure relief or blowdown valve | |
| US2359111A (en) | Automatic vent for fluid pressure regulators | |
| US2026704A (en) | Valve | |
| US5372157A (en) | Automatic bypass valve | |
| US4573491A (en) | Tube separator | |
| US1627628A (en) | Automatic control valve | |
| JPH024923B2 (en) | ||
| US2907347A (en) | Control units for pressure-actuated devices | |
| US5295512A (en) | Fluid control spool valve | |
| JPS647370Y2 (en) | ||
| CN2465009Y (en) | Guiding type safety valve with discharging valve device | |
| US4231386A (en) | Differential pressure relief valve | |
| US948445A (en) | Non-return-valve mechanism. | |
| JPH0428953B2 (en) | ||
| JP3977194B2 (en) | Pressure reducing valve | |
| JP2562394Y2 (en) | Pilot type steam trap | |
| JPH0716168Y2 (en) | Pressure reducing drain valve | |
| KR100414161B1 (en) | automatic valve controled by different pressure | |
| JPS5845346Y2 (en) | Pressure reducing valve for cold regions | |
| JPS62249211A (en) | Automatic pressure control valve | |
| CA1171891A (en) | Constant pressure nozzle with modulation effect | |
| US2879024A (en) | Valve construction for refrigerating systems | |
| JP3509284B2 (en) | Pressure reducing valve | |
| US1173835A (en) | Pressure-regulator. | |
| JPH04132508U (en) | Water pressure reducing valve |