JPH08270806A - Automatic pressure regulating valve - Google Patents
Automatic pressure regulating valveInfo
- Publication number
- JPH08270806A JPH08270806A JP9300195A JP9300195A JPH08270806A JP H08270806 A JPH08270806 A JP H08270806A JP 9300195 A JP9300195 A JP 9300195A JP 9300195 A JP9300195 A JP 9300195A JP H08270806 A JPH08270806 A JP H08270806A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- small
- diameter
- chamber
- diameter 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.)
- Pending
Links
Landscapes
- Lift Valve (AREA)
- Fluid-Driven Valves (AREA)
- Details Of Valves (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は例えば上水道等に使用さ
れる自動圧力調整弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pressure control valve used in, for example, waterworks.
【0002】[0002]
【従来の技術】例えば上水道の給水に於ては、給水管の
漏水を最小限度に抑制するために、送水元から最終送水
先に至るまでの間に給水圧力を段階的に小さくし、しか
も良好な給水状態を得るために、送水先での水の使用に
応じて送水元からの水の供給量を調整する圧力調整弁が
公知である。2. Description of the Related Art For example, in water supply of water supply, in order to minimize leakage of water in a water supply pipe, the water supply pressure is gradually reduced from the water source to the final water destination, and it is good. A pressure control valve is known that adjusts the amount of water supplied from a water source according to the use of water at a water destination in order to obtain a proper water supply state.
【0003】このような圧力調整弁は各種各様のものが
供給されているが、おおむね、装置をはさんで送水元側
を高圧に、また、送水先側を低圧にし、その圧力差が一
定の範囲にある場合には圧力調整弁が閉鎖状態を維持し
続け、例えば各家庭などの水使用により送水先側の圧力
が定められた値より低下した場合に、弁が開放されて送
水先の需要に応じた送水元からの水の供給が行えるよう
にしたものである。Various types of such pressure regulating valves are supplied, but generally, the pressure difference is constant by sandwiching the device to make the water source side high pressure and the water destination side low pressure. In the range of, the pressure control valve continues to maintain the closed state, and when the pressure on the water receiving side falls below a specified value due to the use of water in each household, for example, the valve is opened and the water It is designed so that water can be supplied from the water source according to demand.
【0004】[0004]
【発明が解決しようとする課題】従来形式の送水先での
圧力の低下によって開放される圧力調整弁は、送水先で
の急激で大きい圧力低下に対しては適当に対応できるも
のの、送水先の小さな圧力の低下に対しては、その内部
の弁構造をわずかに開放することによって対応するた
め、大きな弁構造をわずかに開放して小さな圧力低下に
応じるという、弁構造に於ては最悪の作動状況を避ける
ことができない。Although the pressure regulating valve which is opened by the pressure drop at the water destination of the conventional type can appropriately cope with a sudden and large pressure drop at the water destination, the pressure adjusting valve A small pressure drop is handled by opening the internal valve structure slightly, so that the large valve structure is opened slightly to respond to the small pressure drop, which is the worst operation in the valve structure. The situation is unavoidable.
【0005】そのような作動は、極めて簡単にキャビテ
ーションを発生させ、それがハンチングを引き起こす最
大の原因となることが否定できず、継続的に繰り返しそ
のような状態が続く場合には圧力調整弁本体はもとよ
り、それに接続された各種の装置部品にも多大な悪影響
を及ぼすものである。It is undeniable that such an operation causes cavitation extremely easily, and it is the largest cause of hunting, and if such a state continues continuously and repeatedly, the pressure regulating valve main body will remain. Not to mention, it has a great adverse effect on various device parts connected thereto.
【0006】そのような支障の発生を減少させるために
圧力調整弁の設計を変更し、より精度の高い部品を組み
込んで弁構造の微妙な動作を達成しようとすると、弁本
体もしくはその周辺に別部品を設置せざるをえず、必然
的に完成品のコストを引き上げる結果となってしまう。[0006] In order to reduce the occurrence of such troubles, the design of the pressure regulating valve is changed, and if more precise parts are incorporated to achieve the delicate operation of the valve structure, it is necessary to separate the valve body or its periphery. There is no choice but to install parts, which inevitably results in higher costs for the finished product.
【0007】[0007]
【課題を解決するための手段】前述のごとく、小さな流
量に対して大径の弁を開度を小さく使用するとキャビテ
ーションが生じ易いという問題は、直径の小さな弁を小
さな流量に対して使用することで解決できるのである
が、単に弁の直径を小さくするだけでは、大きな流量が
要求された場合に対応できない。As described above, when a large-diameter valve is used with a small opening for a small flow rate, cavitation is likely to occur. The problem is that a small-diameter valve is used for a small flow rate. However, simply reducing the diameter of the valve cannot cope with the case where a large flow rate is required.
【0008】このようなジレンマを除去するには、直径
の小さな小径弁と直径の大きな大径弁を用意し、送水先
側の圧力低下が小さい場合には小径弁を、また大きい場
合には大径弁を併せて使用することにより、無用のキャ
ビテーションを引き起こさずハンチングが生じにくい弁
装置を得られると考えられる。In order to eliminate such a dilemma, a small diameter valve having a small diameter and a large diameter valve having a large diameter are prepared, and a small diameter valve is used when the pressure drop on the water destination side is small, and a large diameter valve is used when the pressure drop on the destination side is large. By using a diameter valve together, it is considered possible to obtain a valve device that does not cause unnecessary cavitation and is less likely to cause hunting.
【0009】これら小径弁と大径弁の関係は、作動の開
始に当たって、まず小径弁が開放され、小径弁の能力が
一杯に利用された後に小径弁と連動する形で大径弁が開
放されるのが望ましい。The relationship between these small-diameter valve and large-diameter valve is that at the start of operation, the small-diameter valve is first opened, and the small-diameter valve is fully utilized, and then the large-diameter valve is opened in a manner linked with the small-diameter valve. Is desirable.
【0010】したがって、弁本体の隔壁にに大径孔を穿
設しそれを大径弁で閉鎖し、大径弁に小径孔を穿設し、
小径孔を大径弁に対して一定範囲で独立して移動できそ
の範囲を超えると大径弁を一体的に移動させる小径弁で
閉鎖し、小径弁を適当な制御手段により駆動できるよう
にすれば、小さな圧力低下に対して小径弁、大きな圧力
低下に対して小径弁と大径弁が作動して対応する装置を
得ることができる。Therefore, a large-diameter hole is bored in the partition wall of the valve body, which is closed by the large-diameter valve, and a small-diameter hole is bored in the large-diameter valve.
The small-diameter hole can be moved independently of the large-diameter valve within a certain range. For example, a small diameter valve operates for a small pressure drop, and a small diameter valve and a large diameter valve operate for a large pressure drop to obtain a corresponding device.
【0011】更に、キャビテーションの防止に関して考
究すると、第6図のごとく円孔を送水元側から弁板によ
って閉鎖する場合、円孔の周囲に弁座9’となる周縁を
突設し、弁板10’に固定したシール材11’(ゴムデ
ィスク等)をその弁座9’に圧接して目的を達成する
が、その弁座9’である突設周縁の先端部の断面形状並
びに弁板10’にシール材を固定するための固定板1
2’は、それらの縁部が隅角部を備えた断面矩形的な構
造であり、隅角部とその間に形成された弁座の端面が通
過流体の滑らかな移動を妨げ、それによって二つの隅角
部の送水先側に面した方の隅角部に近接した位置にキャ
ビテーションを発生させる。Further, considering the prevention of cavitation, when the circular hole is closed from the water source side by the valve plate as shown in FIG. 6, a peripheral edge which becomes the valve seat 9'is projected around the circular hole to form the valve plate. A sealing material 11 '(rubber disk or the like) fixed to 10' is pressed against the valve seat 9'to achieve the object. The sectional shape of the tip of the protruding peripheral edge of the valve seat 9'and the valve plate 10 Fixing plate 1 for fixing the sealing material to '
2'is a rectangular structure in cross section with their edges having corners, and the corners and the end face of the valve seat formed between them impede the smooth movement of the passing fluid, whereby two Cavitation is generated at a position close to the corner of the corner facing the water destination side.
【0012】このようなキャビテーションは当然ハンチ
ングの原因となり、弁板の振動、騒音の発生、付近の金
属部分やシール材の損耗を引き起こし、弁装置全体の管
理維持に多大の影響を与える。そのような損耗は図6に
示すごとく、弁板10’や固定板12’等の隅角部、更
にはシール材11’のA,B,Cで示された 部分を甚
だしく損耗させる結果となる。Such cavitation naturally causes hunting, which causes vibration of the valve plate, generation of noise, and wear of nearby metal parts and sealing materials, which greatly affects the management and maintenance of the entire valve device. As shown in FIG. 6, such wear results in severe wear of the corners of the valve plate 10 ', the fixed plate 12', etc., as well as the portions A, B, C of the sealing material 11 '. .
【0013】勿論、狭い空隙に加圧された流体を通過さ
せようとする場合、発生するであろうキャビテーション
を完全に除去することは不可能であるが、流体の流れを
なるべく円滑に行わせ、また、空隙の形状を考慮するこ
とによってキャビテーションの発生する位置を変更し、
弁装置の金属部分並びにシール材が被る影響を抑制する
ことが可能である。Of course, it is impossible to completely remove the cavitation that may occur when the pressurized fluid is passed through the narrow space, but the fluid flow should be as smooth as possible. Also, by changing the position of cavitation by considering the shape of the void,
It is possible to suppress the influence of the metal portion of the valve device and the sealing material.
【0014】その手段としては、図5のごとく弁座9並
びにシール材11の固定板12の縁部の先端断面形状を
半円形もしくは曲面にすることが有効であり、それによ
って弁座9の送水元側の水流を円滑にするとともに、送
水先側のキャビテーション発生量を減少させ、更に、キ
ャビテーション発生位置を弁座9並びにシール材11か
らより離れた位置に移動させることができる。As a means for this, as shown in FIG. 5, it is effective to make the tip cross-sectional shape of the valve seat 9 and the edge of the fixing plate 12 of the sealing material 11 a semicircle or a curved surface, whereby the water supply of the valve seat 9 is performed. It is possible to smooth the water flow on the source side, reduce the amount of cavitation generated on the water destination side, and further move the cavitation generation position to a position further away from the valve seat 9 and the sealing material 11.
【0015】加えて、小径弁と大径弁を開放するには、
まず小径弁を開放し次いで小径弁に懸垂される形で大径
弁を開放するようにこれらの弁を相互に連結し、小径弁
を水圧により移動するピストンのピストンロッドに連結
して駆動する。これによってピストンの移動は小径弁に
伝達されてそれを開放し、小径弁が一定範囲以上に移動
すると大径弁が開放されて、要求される大圧力が供給さ
れる。In addition, to open the small diameter valve and the large diameter valve,
First, the small-diameter valve is opened, and then these valves are connected to each other so as to open the large-diameter valve in a manner suspended by the small-diameter valve, and the small-diameter valve is connected to the piston rod of the piston that is moved by hydraulic pressure and is driven. As a result, the movement of the piston is transmitted to the small diameter valve to open it, and when the small diameter valve moves over a certain range, the large diameter valve is opened and the required large pressure is supplied.
【0016】この小径弁と大径弁を駆動するピストン
は、弁装置本体内部の小径弁上方に設置したシリンダ内
に配置され、シリンダはピストンによって流通室と貯留
室に分割される。A piston for driving the small diameter valve and the large diameter valve is arranged in a cylinder installed above the small diameter valve in the main body of the valve device, and the cylinder divides the distribution chamber and the storage chamber by the piston.
【0017】貯留室は弁本体の流入室(送水元側)に連
通され、ピストンが上下方向に移動するようにシリンダ
が設置されている場合、流入室の水圧は貯留室に於て常
時ピストンの下面に加えられている。When the storage chamber is connected to the inflow chamber (the water source side) of the valve body and the cylinder is installed so that the piston moves in the vertical direction, the water pressure of the inflow chamber is always the piston pressure in the storage chamber. It is added to the bottom surface.
【0018】また、流通室はシリンダ内のピストン上面
に設けられ、弁本体の流入室並びに弁本体の流出室(送
水先側)に接続され、本体の流入室とシリンダの流通室
の間には流量調節装置並びにストレーナーなどが介置さ
れ、シリンダの流通室と本体の流出室の間にはパイロッ
ト弁などが設置され、パイロット弁が開放されるとシリ
ンダの流通室内の水の一部が本体の流出室に流れ込み、
それに伴って本体の流入室の水が、流量調節装置、スト
レーナー等を通過してシリンダの流通室に流れ込み、シ
リンダの流通室の失われた圧力を補充しようとする。The flow chamber is provided on the upper surface of the piston in the cylinder and is connected to the inflow chamber of the valve body and the outflow chamber of the valve body (destination side), and between the inflow chamber of the main body and the flow chamber of the cylinder. A flow rate controller and strainer are installed, and a pilot valve is installed between the flow chamber of the cylinder and the flow chamber of the main body.When the pilot valve is opened, part of the water in the flow chamber of the cylinder is It flows into the outflow chamber,
Along with that, the water in the inflow chamber of the main body passes through the flow rate control device, the strainer, etc., and flows into the circulation chamber of the cylinder to try to supplement the pressure lost in the circulation chamber of the cylinder.
【0019】弁本体隔壁の大径孔を閉鎖する大径弁の小
径孔を小径弁が閉鎖しており、小径弁を開放するための
ピストンがシリンダの最下端に位置せしめられ、更に前
述のパイロット弁が閉じている弁本体の閉鎖状態では、
ピストンの上下両面と小径弁及び大径弁の流入室に対し
た面が本体の流入室からの同一の水の圧力を受け、ピス
トンはその位置を維持せしめられるとともに、小径弁と
大径弁はそれらに対応する弁座に押圧せしめられてい
る。The small-diameter valve closes the small-diameter hole of the large-diameter valve which closes the large-diameter hole of the valve body partition, and the piston for opening the small-diameter valve is located at the lowermost end of the cylinder. With the valve body closed with the valve closed,
The upper and lower surfaces of the piston and the surfaces of the small-diameter valve and the large-diameter valve facing the inflow chamber receive the same water pressure from the inflow chamber of the main body, so that the piston can maintain its position and the small-diameter valve and the large-diameter valve It is pressed against the valve seat corresponding to them.
【0020】弁本体の流出室に連結された送水先で水が
使用され、流出室の圧力がパイロット弁の開放設定圧力
より低くなると、小径弁と大径弁は閉鎖されたままで、
シリンダの流通室の水はパイロット弁を経て弁本体の流
出室へ流れ込み、流通室の水圧を低下させる。この場
合、弁本体の流入室からシリンダの流通室へ水が供給さ
れるが、この流路に介置した流量調整装置を予め適当に
設定しておくことにより、流通室への水の供給が緩慢に
なるように制御する。When water is used at the water supply destination connected to the outflow chamber of the valve body and the pressure in the outflow chamber becomes lower than the open set pressure of the pilot valve, the small diameter valve and the large diameter valve remain closed,
Water in the circulation chamber of the cylinder flows into the outflow chamber of the valve body via the pilot valve, and the water pressure in the circulation chamber is reduced. In this case, water is supplied from the inflow chamber of the valve body to the circulation chamber of the cylinder, but by appropriately setting the flow rate adjusting device interposed in this flow path in advance, the water can be supplied to the circulation chamber. Control to be slow.
【0021】このような状態では、シリンダの流通室の
圧力が大きく低下し、流入室の水は貯留室に流入してピ
ストンを上方へ押し上げ、ピストンの移動はピストンロ
ッドにより連結されている小径弁を上昇させ、流入室の
水は小径弁による閉鎖が解除された小径孔から流出室へ
流入する。この流入によって送水先側の圧力がパイロッ
ト弁の設定圧力より上昇した場合には、パイロット弁が
閉鎖し、シリンダの流通室内の圧力は徐々に上昇し、ピ
ストンの上下両面にかかる圧力が等しくなるため、小径
弁に加えられている送水元側の圧力により、小径弁及び
ピストンが下降せしめられ、小径弁が小径孔を閉鎖して
停止する。In such a state, the pressure in the flow chamber of the cylinder greatly decreases, the water in the inflow chamber flows into the storage chamber and pushes up the piston, and the movement of the piston moves with the small diameter valve connected by the piston rod. And the water in the inflow chamber flows into the outflow chamber through the small diameter hole that has been closed by the small diameter valve. When the pressure on the water destination side rises above the set pressure of the pilot valve due to this inflow, the pilot valve closes, the pressure in the flow chamber of the cylinder gradually rises, and the pressure on the upper and lower surfaces of the piston becomes equal. The small-diameter valve and the piston are lowered by the pressure on the water supply side applied to the small-diameter valve, and the small-diameter valve closes the small-diameter hole and stops.
【0022】小径弁の開放だけで足りない場合には、ピ
ストンの上昇に伴い小径弁が一定範囲上昇して小径孔が
開放された後に、更に小径弁が上昇し、大径弁を引き上
げて大径孔を開放し、流入室の水が大径孔から流出室へ
流入する。これによって水圧がパイロット弁の設定圧力
に到達すると、パイロット弁が閉鎖され、流通室の圧力
が高まり、前述の小径弁を閉じた場合と同様の動作で、
大径孔及び小径孔が閉鎖される。When it is not enough to open the small diameter valve, the small diameter valve rises to a certain extent as the piston moves up to open the small diameter hole, and then the small diameter valve further rises and the large diameter valve is pulled up to a large size. The diameter hole is opened, and the water in the inflow chamber flows into the outflow chamber from the large diameter hole. By this, when the water pressure reaches the set pressure of the pilot valve, the pilot valve is closed, the pressure in the flow chamber rises, and the same operation as when the small diameter valve described above is closed,
The large hole and the small hole are closed.
【0023】[0023]
【実施例】図1乃至図4に従い本発明の具体的実施例を
説明すると、図中1は弁装置本体、2は大径孔3が穿設
された隔壁で、弁装置本体1を流入室4(送水元側)と
流出室5(送水先側)に分割している。6はその下方周
縁部にシールリング7が突設され且つ小径孔8が穿設さ
れている大径弁で、小径孔8の周縁には上方に向かって
設置された突縁が弁座9を形成するとともに、大径弁6
は流入室4内にあって隔壁2の大径孔3を閉鎖してい
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the drawings, 1 is a valve device main body, 2 is a partition wall having a large diameter hole 3 formed therein, and the valve device main body 1 is provided with an inflow chamber. It is divided into 4 (water sending side) and outflow chamber 5 (water sending side). Reference numeral 6 denotes a large-diameter valve having a seal ring 7 and a small-diameter hole 8 formed on the lower peripheral edge thereof, and a projecting edge installed upward on the peripheral edge of the small-diameter hole 8 has a valve seat 9. Formed and large-diameter valve 6
Is in the inflow chamber 4 and closes the large diameter hole 3 of the partition wall 2.
【0024】小径孔8を閉鎖する小径弁10は大径弁6
の上方に設置され、その下面には大径弁6の小径孔8の
弁座9に当接して小径孔8を閉鎖するためのシール材1
1が固体板12を介して固定されると共に、その上面に
はピストンロッド13が突設されている。小径弁10の
下面、固定板12の下面及び弁座9の上方縁部に存在す
る隅角部は、すべて曲面により構成し、水流が隅角部に
よって乱されて発生するキャビテーションを減衰させる
ように工夫されている。The small-diameter valve 10 for closing the small-diameter hole 8 is the large-diameter valve 6
A seal member 1 installed on the upper surface of the valve for abutting against the valve seat 9 of the small diameter hole 8 of the large diameter valve 6 to close the small diameter hole 8.
1 is fixed via a solid plate 12, and a piston rod 13 is projectingly provided on the upper surface thereof. The lower surface of the small-diameter valve 10, the lower surface of the fixed plate 12, and the corners existing on the upper edge of the valve seat 9 are all formed by curved surfaces so that cavitation generated by the water flow being disturbed by the corners is attenuated. It is devised.
【0025】14はピストンロッド13が貫通する連結
板で連結脚15、15により大径弁6に固定されてお
り、小径弁10は大径弁6と連結板14の間で一定範囲
だけ独立して移動できるように連結されており、図4の
ごとく大小二つの弁が閉鎖されているときにピストンロ
ッド13が上昇すると、図1のごとくまず小径弁10が
上昇を開始して小径孔8が開放され、小径弁10が連結
板14に当接してこれを図2のごとく上昇させると、そ
れに伴って大径弁6が上昇して大径孔3が開放されるこ
とになる。Reference numeral 14 is a connecting plate through which the piston rod 13 penetrates and is fixed to the large-diameter valve 6 by connecting legs 15 and 15. The small-diameter valve 10 is independent between the large-diameter valve 6 and the connecting plate 14 by a certain range. When the piston rod 13 rises when the two large and small valves are closed as shown in FIG. 4, the small diameter valve 10 first starts to rise and the small diameter hole 8 is formed as shown in FIG. When the small-diameter valve 10 is opened and abuts on the connecting plate 14 and raises it as shown in FIG. 2, the large-diameter valve 6 rises accordingly and the large-diameter hole 3 is opened.
【0026】16は、弁装置本体1の上方に配設された
シリンダ17内を図中上下方向に摺動するピストンで、
その下面には小径弁10のピストンロッド3が固定され
ており、上面には操作ロッド18が延長されている。ピ
ストン16によってシリンダ17は上下二室に分割され
ており、シリンダ17の上方開口部は蓋体19によって
閉鎖されピストン16と蓋体19によって流通室20が
形成され、シリンダ17の下方底面17’とピストン1
6によって貯留室21が形成されている。Reference numeral 16 denotes a piston which slides in the cylinder 17 arranged above the valve device main body 1 in the vertical direction in the figure,
The piston rod 3 of the small diameter valve 10 is fixed to the lower surface thereof, and the operation rod 18 is extended to the upper surface thereof. The cylinder 16 is divided into upper and lower chambers by the piston 16, and the upper opening of the cylinder 17 is closed by the lid body 19 to form the flow chamber 20 by the piston 16 and the lid body 19. Piston 1
A storage chamber 21 is formed by 6.
【0027】シリンダ17の下方底面17’には通孔2
2が穿設されており、流入室4と貯留室22が連通され
ると共に、シリンダ17上方の流通室20は流入導管2
3によって弁本体1の流入室4に連結され、流出導管2
4によって流出室5に連結されている。A through hole 2 is formed in the lower bottom surface 17 'of the cylinder 17.
2, the inflow chamber 4 and the storage chamber 22 are communicated with each other, and the flow chamber 20 above the cylinder 17 is connected to the inflow conduit 2
3 is connected to the inflow chamber 4 of the valve body 1 and the outflow conduit 2
It is connected to the outflow chamber 5 by 4.
【0028】流入導管23はその中間部に制御部25を
備えており、制御部25はオリフィス、チャッキ弁、ス
トレーナー等によって構成され、弁本体1の流入室4か
らシリンダ17の流通室20に流入する圧力水の流入度
合いの調整を行う。The inflow conduit 23 is provided with a control unit 25 in the middle thereof. The control unit 25 is composed of an orifice, a check valve, a strainer, etc., and flows from the inflow chamber 4 of the valve body 1 into the flow chamber 20 of the cylinder 17. Adjust the degree of pressure water inflow.
【0029】流出導管24はその中間部に予め圧力を設
定されたパイロット弁26を備えており、パイロット弁
26に作用する圧力が設定値よりも低下すると、パイロ
ット弁26が開いて、シリンダ17の流通室20の水が
流出導管24を経て弁本体1の流出室5へ流出する。The outflow conduit 24 is provided with a pilot valve 26 whose pressure is set in advance in the middle portion thereof, and when the pressure acting on the pilot valve 26 falls below a set value, the pilot valve 26 opens and the cylinder 17 of the cylinder 17 is opened. Water in the circulation chamber 20 flows out to the outflow chamber 5 of the valve body 1 through the outflow conduit 24.
【0030】27は蓋体19から気密的に突出している
操作ロッド18に対向して設置された螺入ハンドルで、
これを回動することにより螺軸27’を図3のごとく下
降させ、操作ロッド18を押圧下降せしめることによ
り、ピストン16、ピストンロッド13並びに小径弁1
0を下降せしめ、大径孔3及び小径孔8を閉鎖すること
ができる。Reference numeral 27 denotes a screw-in handle which is installed so as to face the operation rod 18 which is airtightly projected from the lid 19.
By rotating this, the screw shaft 27 'is lowered as shown in FIG. 3, and the operating rod 18 is pushed down to lower the piston 16, the piston rod 13, and the small diameter valve 1.
It is possible to lower 0 and close the large diameter hole 3 and the small diameter hole 8.
【0031】28は蓋体19に設置された排気弁で、装
置始動に際しての設定を行う時にシリンダ17の流通室
20内の空気を排気するために使用する。Reference numeral 28 denotes an exhaust valve installed on the lid body 19, which is used for exhausting the air in the flow chamber 20 of the cylinder 17 when the setting for starting the apparatus is performed.
【0032】次に弁本体1を送水の回路に挿入する場合
につき手順の概略を説明すると、弁本体1の流入室4に
接続される上流側管29及び流出室に接続される下流側
管30にはそれぞれ仕切弁(図示せず)が設置されてお
り、これら仕切弁を閉鎖して送水を遮断した上で作業を
行う。The outline of the procedure for inserting the valve body 1 into the water supply circuit will be described below. An upstream pipe 29 connected to the inflow chamber 4 of the valve body 1 and a downstream pipe 30 connected to the outflow chamber of the valve body 1. Each has a sluice valve (not shown) installed, and these sluice valves are closed to cut off the water supply before the work is performed.
【0033】弁本体1を設置するに当たり、螺入ハンド
ル27を回転して螺軸27’を下降させ、図3のごとく
大径孔3と小径孔8を完全に閉鎖すると共にパイロット
弁26を閉じておく。このようにした弁本体1を上流側
管29及び下流側管30の間に液密的に固定し、上流側
の仕切弁を開放すると、送水元側の水は流入室4からシ
リンダ17の下方底面17’に穿設された通孔22を経
てシリンダ17の貯留室21へ、また、流入導管23を
経てシリンダ17の流通室20へ流れ込む。When the valve body 1 is installed, the screwing handle 27 is rotated to lower the screw shaft 27 'to completely close the large diameter hole 3 and the small diameter hole 8 and close the pilot valve 26 as shown in FIG. Keep it. When the valve body 1 thus configured is liquid-tightly fixed between the upstream pipe 29 and the downstream pipe 30 and the upstream sluice valve is opened, the water on the water source side will flow from the inflow chamber 4 to the lower side of the cylinder 17. It flows into the storage chamber 21 of the cylinder 17 through the through hole 22 formed in the bottom surface 17 ′ and into the flow chamber 20 of the cylinder 17 through the inflow conduit 23.
【0034】この際に排気弁28を開放して流通室20
内の残存空気を排気し、流入室4と流通室20への水の
流入が安定したところで下流側の仕切弁を開放し、下流
側管30内の水を弁本体1の流出室5内に満たす。この
状態で別途用意した水圧計測手段によって上流側管29
及び下流側管30内のそれぞれの水圧を計測し、下流側
管30内の水圧が予定した値より低下するとパイロット
弁26が開くようにパイロット弁26を調整する。At this time, the exhaust valve 28 is opened to open the flow chamber 20.
The residual air in the inside is exhausted, the sluice valve on the downstream side is opened when the inflow of the water into the inflow chamber 4 and the distribution chamber 20 is stabilized, and the water in the downstream pipe 30 is introduced into the outflow chamber 5 of the valve body 1. Fulfill. In this state, the upstream pipe 29 is separately prepared by the water pressure measuring means.
Also, the water pressure in each of the downstream pipe 30 is measured, and the pilot valve 26 is adjusted so that the pilot valve 26 opens when the water pressure in the downstream pipe 30 falls below a predetermined value.
【0035】以上の手続が終了したならば、螺入ハンド
ル27を逆回転し螺軸27’を上昇させて操作ロッド1
8の固定を解き、大径弁6と小径弁10を図4の位置に
置き去りにして設置作業は完了する。When the above procedure is completed, the screw-in handle 27 is rotated in the reverse direction to raise the screw shaft 27 'and the operating rod 1
8 is released, and the large-diameter valve 6 and the small-diameter valve 10 are left at the positions shown in FIG. 4 to complete the installation work.
【0036】作動につき説明すると、下流側管30並び
に弁本体1の流出室5内の水圧が所定の圧力より低下す
ると、閉鎖されていたパイロット弁26が開放されて流
通室20の水が流出導管24を経て流出室5内に流入す
る。流通室20への水の供給は流入導管23によって行
われるが、介置されている制御部25によって流入量が
流出導管24による流出量よりも小さく調整されている
ので、ピストン16が流通室20の水によって受ける圧
力は、ピストン16が貯留室21の水によって受ける圧
力よりも低くなり、ピストン16は通孔22から貯留室
21に供給され続ける水の圧力によってシリンダ17内
を上昇せしめられることになる。The operation will be described. When the water pressure in the downstream pipe 30 and the outflow chamber 5 of the valve body 1 falls below a predetermined pressure, the closed pilot valve 26 is opened and the water in the flow chamber 20 flows out. It flows into the outflow chamber 5 via 24. The water is supplied to the distribution chamber 20 by the inflow conduit 23, but since the inflow amount is adjusted to be smaller than the outflow amount by the outflow conduit 24 by the interposing control unit 25, the piston 16 is moved to the distribution chamber 20. The pressure received by the water in the storage chamber 21 is lower than the pressure received by the water in the storage chamber 21, and the piston 16 is raised in the cylinder 17 by the pressure of the water continuously supplied from the through hole 22 to the storage chamber 21. Become.
【0037】ピストン16が上昇すると、ピストンロッ
ド13によりピストン16と連結されている小径弁10
も上昇し、閉鎖していた小径孔8を開放し、流入室4内
の水を徐々に流出室5内へ送り込む。この場合、小径孔
8が穿設された大径弁6は移動することなく隔壁2の大
径孔3を閉鎖し続ける。When the piston 16 moves up, the small diameter valve 10 connected to the piston 16 by the piston rod 13
Also rises to open the closed small diameter hole 8 and gradually send the water in the inflow chamber 4 into the outflow chamber 5. In this case, the large diameter valve 6 provided with the small diameter hole 8 does not move and continues to close the large diameter hole 3 of the partition wall 2.
【0038】前記のごとく小径孔8から水が送給されて
も流出室5内の圧力が所望の値まで高まらない場合(流
出室5の水圧が極めて低いため少量の水の送給では不足
する場合)には、パイロット弁26が開放され続けるた
め、流通室20の水が流出導管24を経て流れ続けるた
め、流出室20の圧力は更に低下し、圧力の低下は更な
るピストン16の上昇を生み出す。When the pressure in the outflow chamber 5 does not rise to a desired value even if water is fed from the small diameter hole 8 as described above (the water pressure in the outflow chamber 5 is extremely low, it is insufficient to feed a small amount of water). In this case), the pilot valve 26 continues to be opened, and the water in the flow chamber 20 continues to flow through the outflow conduit 24, so that the pressure in the outflow chamber 20 further decreases, and the decrease in pressure causes a further rise in the piston 16. produce.
【0039】更なるピストン16の上昇により小径弁1
0が上昇し続け、それが連結板14に当接すると、小径
弁10が連結板15と一体の大径弁6を引き上げるた
め、大径弁6は上昇して閉鎖していた隔壁2の大径孔3
を徐々に開放する。これによって流入室4から流出室5
への水の送給は大幅に増量されて流出室5の圧力を迅速
に高める結果となる。By further raising the piston 16, the small diameter valve 1
When 0 continues to rise and comes into contact with the connecting plate 14, the small-diameter valve 10 pulls up the large-diameter valve 6 integrated with the connecting plate 15, so that the large-diameter valve 6 rises and closes the large size of the partition wall 2. Bore 3
Gradually open. Thereby, the inflow chamber 4 to the outflow chamber 5
The delivery of water to is greatly increased, resulting in a rapid increase in the pressure in the outflow chamber 5.
【0040】流出室5の圧力が高まってパイロット弁2
6の設定値に等しくなると、まずパイロット弁26は閉
鎖され、流通室20からの水の流出が停止され、流入導
管23から流通室20へ流入室4の水が供給されるとと
もに、流通室20内の圧力が高まり、ピストン16の上
下両面に加えられる圧力が等しくなるので、ピストン1
6は大径弁6及び小径弁16に加えられている水の圧力
によって下降し、まず大径弁6が大径孔3を閉鎖した後
に、小径弁10が小径孔8を閉鎖して、流入室4から流
出室5への水の移動は停止される。The pressure in the outflow chamber 5 increases and the pilot valve 2
When it becomes equal to the set value of 6, the pilot valve 26 is first closed, the outflow of water from the distribution chamber 20 is stopped, the water in the inflow chamber 4 is supplied from the inflow conduit 23 to the distribution chamber 20, and the distribution chamber 20 is also supplied. Since the internal pressure increases and the pressure applied to both the upper and lower surfaces of the piston 16 becomes equal, the piston 1
6 descends due to the pressure of the water applied to the large-diameter valve 6 and the small-diameter valve 16, first the large-diameter valve 6 closes the large-diameter hole 3, and then the small-diameter valve 10 closes the small-diameter hole 8 to inflow. The movement of water from the chamber 4 to the outflow chamber 5 is stopped.
【0041】このように閉鎖された本発明弁装置は、要
求される水量が小さな場合には小径弁10のみが作動し
て小径孔8を開口し、大きな水量が要求される場合には
小径弁10に加えて大径弁6が作動して大径孔3を開口
し、各々必要な状況に対応する。In the valve device of the present invention thus closed, only the small diameter valve 10 operates to open the small diameter hole 8 when the required water amount is small, and the small diameter valve 10 when the large water amount is required. In addition to 10, the large-diameter valve 6 operates to open the large-diameter hole 3 so as to respond to each necessary situation.
【0042】本発明によると、パイロット弁26の開放
による流通室20内の水の流出に対して、流入導管23
による流通室20への水の流入が制御部25によってコ
ントロールできるので、小径弁10を開放するためのピ
ストン16の移動を自由に調節することができ、パイロ
ット弁26が開放された時に小径弁10が極めて緩やか
かつ滑らかに移動するように調節することができるた
め、キャビテーションの発生を最小限にとどめることが
できる。According to the present invention, inflow conduit 23 is provided for the outflow of water in distribution chamber 20 due to the opening of pilot valve 26.
Since the inflow of water into the flow chamber 20 by the control unit 25 can be controlled by the control unit 25, the movement of the piston 16 for opening the small diameter valve 10 can be freely adjusted, and the small diameter valve 10 can be opened when the pilot valve 26 is opened. Can be adjusted so as to move extremely slowly and smoothly, so that the occurrence of cavitation can be minimized.
【0043】また、弁座9の上面縁部、小径弁10の下
面縁部及び固定板12の縁部はすべて曲面になるように
鋭利な角を落としてあるので、水流は鋭利な隅角部によ
って即座にキャビテーションを引き起こされることな
く、例え後方真空が発生するとしてもそれはこのような
縁部から離れた場所に発生することになり、ハンチング
等の原因にならないとともに、キャビテーションが弁装
置に与えるによる損耗をほぼ完全に除去することができ
る。Further, since the upper edge of the valve seat 9, the lower edge of the small diameter valve 10 and the edge of the fixing plate 12 are all sharpened so as to form a curved surface, the water flow has a sharp corner. Even if a backward vacuum occurs, it will occur at a place away from such an edge without causing cavitation immediately by the cavitation, it does not cause hunting, etc. The wear can be removed almost completely.
【0044】[0044]
【発明の効果】このように、要求される流量が小である
場合には小径弁を解放してそれに対応する形式は、直径
の大きな弁の開度を小さくして小流量に対応する従来の
形式に比較して、弁の周囲での乱流が生じにくく、キャ
ビテーションの発生を極力抑制することができるので、
弁体の故障の原因となるハンチングをほぼ完全に防止す
ることができると共に、小径弁と大径弁の受圧面積及び
ピストンの受圧面積を適宜調整して設計を施すことによ
り、送水元側圧力と送水先側圧力の理想的なバランスを
取ることが可能となり、更にパイロット弁と流量調節装
置を調整し、シリンダの流通室の水の移動を適宜調整す
ることにより、より緩やかな小径弁の開放を得ることが
できるので、小径孔に設置された弁座の断面形状の変更
と合わせてキャビテーションの大幅な抑制、ハンチング
の除去を行うことが可能となる。効果がある。As described above, when the required flow rate is small, the small-diameter valve is opened to accommodate the small flow rate. Compared to the model, turbulence around the valve is less likely to occur and cavitation can be suppressed as much as possible.
Hunting, which causes failure of the valve element, can be almost completely prevented, and by adjusting the pressure receiving area of the small diameter valve and the large diameter valve and the pressure receiving area of the piston appropriately, it is possible to reduce the pressure on the water source side. It is possible to achieve the ideal balance of pressure on the water destination side, and further adjust the pilot valve and flow rate control device to appropriately adjust the movement of water in the circulation chamber of the cylinder to open the gradual opening of the small diameter valve. As a result, it is possible to significantly suppress cavitation and remove hunting in addition to changing the cross-sectional shape of the valve seat installed in the small diameter hole. effective.
【図1】本発明の断面で小径弁のみが開放された状態を
示す概念図である。FIG. 1 is a conceptual view showing a state in which only a small diameter valve is opened in a cross section of the present invention.
【図2】本発明の断面で小径弁及び大径弁が開放された
状態を示す概念図である。FIG. 2 is a conceptual diagram showing a state in which a small diameter valve and a large diameter valve are opened in a cross section of the present invention.
【図3】本発明の断面で小径弁と大径弁が螺軸によって
閉鎖位置に固定された状態を示す概念図である。FIG. 3 is a conceptual diagram showing a state in which a small diameter valve and a large diameter valve are fixed to a closed position by a screw shaft in a cross section of the present invention.
【図4】本発明の断面で小径弁と大径弁が固定されるこ
と無く小径孔と大径孔を閉鎖した状態を示す概念図であ
る。FIG. 4 is a conceptual diagram showing a state in which a small diameter hole and a large diameter valve are closed without fixing the small diameter valve and the large diameter valve in the cross section of the present invention.
【図5】本発明による弁座及び小径弁の部分的断面図で
ある。FIG. 5 is a partial sectional view of a valve seat and a small diameter valve according to the present invention.
【図6】従来の弁座及び小径弁の部分的断面図である。 1 弁本体 2 隔壁 3 大径孔 4 流入室 5 流出室 6 大径弁 7 シールリング 8 小径孔 9 弁座 10 小径弁 11 シール材 12 固定板 13 ピストンロッド 14 連結板 15 連結脚 16 ピストン 17 シリンダ 17’ 下方底面 18 操作ロッド 19 蓋体 20 流通室 21 貯留室 22 通孔 23 流入導管 24 流出導管 25 制御部 26 パイロット弁 27 螺入ハンドル 27’ 螺軸 28 排気弁 29 上流側管 30 下流側管FIG. 6 is a partial cross-sectional view of a conventional valve seat and a small diameter valve. 1 Valve body 2 Partition wall 3 Large diameter hole 4 Inflow chamber 5 Outflow chamber 6 Large diameter valve 7 Seal ring 8 Small diameter hole 9 Valve seat 10 Small diameter valve 11 Seal material 12 Fixing plate 13 Piston rod 14 Connecting plate 15 Connecting leg 16 Piston 17 Cylinder 17 'Lower bottom surface 18 Operation rod 19 Lid body 20 Flow chamber 21 Storage chamber 22 Through hole 23 Inflow conduit 24 Outflow conduit 25 Control part 26 Pilot valve 27 Screw-in handle 27' Screw shaft 28 Exhaust valve 29 Upstream pipe 30 Downstream pipe
Claims (3)
とに分割された弁本体と、 ピストンによって流通室と貯留室に分割されたシリンダ
と、 大径孔を閉鎖する大径弁と、 大径弁に穿設された小径孔を閉鎖する小径弁と、からな
り、 弁本体の流入室とシリンダの流通室並びに弁本体の流出
室とシリンダの流通室を適当な流量調整装置もしくはパ
イロット弁等を介して連結し、 弁本体の流入室とシリンダの貯留室を連通するととも
に、 シリンダ内のピストンと流入室内の小径弁をピストンロ
ッドにより連結し、 小径弁の一定範囲での独立した移動を許す状態で小径弁
と大径弁を可動的に連結し、 ピストンがシリンダの貯留室空間を最小にする位置にあ
るときに小径弁が大径弁の小径孔を閉鎖しまた大径弁が
隔壁の大径孔を閉鎖すべく調整し、 本体の流出室の圧力の低下がシリンダの流通室の圧力を
低下させ、本体の流入室の流体がシリンダの貯留室に流
入してピストンを移動させ、まず第一にピストンロッド
に連結された小径弁を移動させて大径弁の小径孔を開放
し、更に流出室の圧力が低下するとピストンの更なる移
動により移動可能範囲の限界に達した小径弁が大径弁を
移動させて、隔壁に穿設された大径孔を開放することを
特徴とする自動圧力調整弁。1. A valve body divided into an inflow chamber and an outflow chamber by a partition having a large diameter hole, a cylinder divided into a flow chamber and a storage chamber by a piston, and a large diameter valve closing the large diameter hole. And a small-diameter valve that closes a small-diameter hole formed in the large-diameter valve.The flow-in chamber of the valve body and the flow chamber of the cylinder, and the flow-out chamber of the valve body and the flow chamber of the cylinder are provided with appropriate flow control devices or By connecting via a pilot valve, etc., the inflow chamber of the valve body and the storage chamber of the cylinder are communicated, and the piston in the cylinder and the small diameter valve in the inflow chamber are connected by a piston rod, which is independent of the small diameter valve within a certain range. The small-diameter valve and the large-diameter valve are movably connected while allowing movement, and the small-diameter valve closes the small-diameter hole of the large-diameter valve when the piston is in a position that minimizes the cylinder storage chamber space. Adjusted to close large holes in bulkhead , The decrease of the pressure of the outflow chamber of the main body decreases the pressure of the flow chamber of the cylinder, the fluid of the inflow chamber of the main body flows into the storage chamber of the cylinder to move the piston, and first of all, it was connected to the piston rod. When the small-diameter valve is moved to open the small-diameter hole of the large-diameter valve, and when the pressure in the outflow chamber further decreases, the piston moves further and the small-diameter valve moves to the limit of the movable range and moves the large-diameter valve to move the partition wall. An automatic pressure control valve characterized by opening a large-diameter hole drilled in the.
かって突出した小径孔の縁部を小径弁のパッキンに当接
させて行われ、縁部の先端断面形状が半円形にされてい
ることを特徴とする請求項1記載の自動圧力調整弁。2. A small diameter valve is closed by a small diameter valve by bringing the edge of the small diameter hole projecting toward the small diameter valve into contact with the packing of the small diameter valve, and making the cross-sectional shape of the tip of the edge semicircular. The automatic pressure regulating valve according to claim 1, wherein
かって突出した小径孔の縁部を小径弁のパッキンに当接
させて行われ、縁部の先端断面形状が半円形にされると
共に小径弁のパッキン押え金具の隅角部を曲面により構
成したことを特徴とする請求項1記載の自動圧力調整
弁。3. A small-diameter valve is closed by a small-diameter valve by bringing the edge of the small-diameter hole projecting toward the small-diameter valve into contact with the packing of the small-diameter valve, so that the cross section of the edge has a semicircular shape. The automatic pressure regulating valve according to claim 1, wherein the corner portion of the packing holding metal fitting of the small diameter valve is formed by a curved surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9300195A JPH08270806A (en) | 1995-03-27 | 1995-03-27 | Automatic pressure regulating valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9300195A JPH08270806A (en) | 1995-03-27 | 1995-03-27 | Automatic pressure regulating valve |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08270806A true JPH08270806A (en) | 1996-10-15 |
Family
ID=14070141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9300195A Pending JPH08270806A (en) | 1995-03-27 | 1995-03-27 | Automatic pressure regulating valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08270806A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001349464A (en) * | 2000-06-05 | 2001-12-21 | Koguma Kikai Kk | Valve gear |
JP2007293779A (en) * | 2006-04-27 | 2007-11-08 | Nichiben Tokushu Kogyo:Kk | Pressure reducing valve |
JP2009185924A (en) * | 2008-02-07 | 2009-08-20 | Kurimoto Ltd | Constant flow valve |
KR100970322B1 (en) * | 2008-08-04 | 2010-07-16 | 서울특별시 | Sealing water supply valve of pump |
CN104061337A (en) * | 2014-06-30 | 2014-09-24 | 广东永泉阀门科技有限公司 | Improved piston-type control valve |
CN104074983A (en) * | 2013-03-25 | 2014-10-01 | 挺宇集团有限公司 | A self-operated bidirectional fast stop valve |
CN107448615A (en) * | 2017-07-05 | 2017-12-08 | 九江中船消防设备有限公司 | A kind of draining hydraulic control valve of double counter balance pocket bivalve valve structures |
KR20180040024A (en) * | 2016-10-11 | 2018-04-19 | 함광식 | a back flow preventing type check valve with quick-closing |
CN108644396A (en) * | 2018-04-17 | 2018-10-12 | 西北工业大学 | A kind of protection system of high-temperature high pressure valve |
JP6470862B1 (en) * | 2018-08-10 | 2019-02-13 | 兼工業株式会社 | Forced on / off valve mechanism for main valve |
CN110043330A (en) * | 2019-05-05 | 2019-07-23 | 江苏源生源动力科技有限公司 | A kind of steam turbine with safety is into the steam control valve institution of distributing gas |
-
1995
- 1995-03-27 JP JP9300195A patent/JPH08270806A/en active Pending
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001349464A (en) * | 2000-06-05 | 2001-12-21 | Koguma Kikai Kk | Valve gear |
JP4547648B2 (en) * | 2000-06-05 | 2010-09-22 | 小熊機械株式会社 | Valve device |
JP2007293779A (en) * | 2006-04-27 | 2007-11-08 | Nichiben Tokushu Kogyo:Kk | Pressure reducing valve |
JP4659669B2 (en) * | 2006-04-27 | 2011-03-30 | 株式会社日弁特殊工業 | Pressure reducing valve |
JP2009185924A (en) * | 2008-02-07 | 2009-08-20 | Kurimoto Ltd | Constant flow valve |
JP4690430B2 (en) * | 2008-02-07 | 2011-06-01 | 株式会社栗本鐵工所 | Constant flow valve |
KR100970322B1 (en) * | 2008-08-04 | 2010-07-16 | 서울특별시 | Sealing water supply valve of pump |
CN104074983A (en) * | 2013-03-25 | 2014-10-01 | 挺宇集团有限公司 | A self-operated bidirectional fast stop valve |
CN104074983B (en) * | 2013-03-25 | 2016-04-06 | 浙江挺宇流体设备股份有限公司 | The two-way repid cut-off valve of self-powering type |
CN104061337A (en) * | 2014-06-30 | 2014-09-24 | 广东永泉阀门科技有限公司 | Improved piston-type control valve |
KR20180040024A (en) * | 2016-10-11 | 2018-04-19 | 함광식 | a back flow preventing type check valve with quick-closing |
CN107448615A (en) * | 2017-07-05 | 2017-12-08 | 九江中船消防设备有限公司 | A kind of draining hydraulic control valve of double counter balance pocket bivalve valve structures |
CN108644396A (en) * | 2018-04-17 | 2018-10-12 | 西北工业大学 | A kind of protection system of high-temperature high pressure valve |
JP6470862B1 (en) * | 2018-08-10 | 2019-02-13 | 兼工業株式会社 | Forced on / off valve mechanism for main valve |
JP2020026844A (en) * | 2018-08-10 | 2020-02-20 | 兼工業株式会社 | Forcible on-off valve mechanism for main valve |
CN110043330A (en) * | 2019-05-05 | 2019-07-23 | 江苏源生源动力科技有限公司 | A kind of steam turbine with safety is into the steam control valve institution of distributing gas |
CN110043330B (en) * | 2019-05-05 | 2021-08-03 | 江苏源生源动力科技有限公司 | Steam turbine steam inlet regulating valve steam distribution mechanism with safety |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH08270806A (en) | Automatic pressure regulating valve | |
US5372157A (en) | Automatic bypass valve | |
KR101994110B1 (en) | A control valve with back pressure prevention function | |
US20200149653A1 (en) | Actuator and valve device | |
JP2002071048A (en) | Automatic pressure regulating valve | |
CN207393968U (en) | A kind of axial-flow type water control ball-cock assembly | |
JP2002286158A (en) | Electromagnetic stop cock | |
KR101453353B1 (en) | Constant flow valve | |
CN107676519A (en) | A kind of axial-flow type water control regulating valve | |
US11047503B2 (en) | Actuator, valve device, and fluid supply system | |
KR102008502B1 (en) | Pressure reducing valve assembly with lifting adjustable of pressure reduction | |
KR101717509B1 (en) | Variable type Hydraulic or Pneumatic Check Valve | |
WO2023002953A1 (en) | Timing adjustment valve and suckback valve provided with same | |
KR20010013329A (en) | Actuator valve for pressure switch for a hydraulic system | |
KR101978164B1 (en) | Pressure reducing valve having adjustable control device for inlet-flow | |
WO2023286739A1 (en) | Suck-back valve | |
KR930000193B1 (en) | Pressure reducing control valve for fluid | |
KR100421460B1 (en) | Auto flow and temperature control valve | |
JP2000055007A (en) | Supply stopping valve | |
JPH0716171Y2 (en) | Pressure reducing valve for water supply device | |
KR200295869Y1 (en) | Pressure reducing valve | |
JP2007229400A (en) | Step-by-step water drainage automatic valve system | |
JP2007267775A (en) | Foam mixing apparatus | |
JPH0320621Y2 (en) | ||
JPH0320620Y2 (en) |