JP2003021260A - Backflow preventing unit - Google Patents
Backflow preventing unitInfo
- Publication number
- JP2003021260A JP2003021260A JP2001204585A JP2001204585A JP2003021260A JP 2003021260 A JP2003021260 A JP 2003021260A JP 2001204585 A JP2001204585 A JP 2001204585A JP 2001204585 A JP2001204585 A JP 2001204585A JP 2003021260 A JP2003021260 A JP 2003021260A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- diaphragm
- closing wall
- backflow preventer
- housing
- 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
- Check Valves (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は給水本管に枝状に
接続し、給水ポンプを途中に備えた給水管の、上記給水
ポンプよりも下流に設けられ、給水本管から枝状の給水
管に流入し、給水ポンプで加圧されたり、貯水槽から給
水ポンプで加圧されて例えば家庭、工場などの水使用場
所に供給される水が給水管中を逆流するのを防止する逆
流防止器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply pipe which is connected to a water supply main in a branch shape, and which is provided downstream of the water supply pump of a water supply pipe provided with a water supply pump on the way, and which is branched from the water supply main. A backflow preventer that prevents the water that flows into the water and is pressurized by the water supply pump, or pressurized from the water tank by the water supply pump and supplied to the place of water use, such as a home or a factory, from flowing back through the water supply pipe. Regarding
【０００２】[0002]
【従来の技術】上記したような逆流防止器を、本特許出
願人は特開平９−１３７８６９号公報で提案した。この
先行提案の逆流防止器は、ハウジング中に枝状の給水管
の上流や、貯水槽からの給水管である一次側を接続する
流入口と、上記流入口と連通し、給水管の下流である１
つ又は複数の二次側を接続する流出口と、バネの付勢に
より上記流入口を内側から閉じて流入口と流出口との連
通を遮断する逆止弁とを備えている。従って、給水本管
や貯水槽から給水ポンプの運転で所定圧力に加圧された
一次側の水が流入口に到達すると、その水の圧力で逆止
弁の弁体は付勢に抗して開き、水はハウジング中を流
れ、１つ又は複数の流出口から給水管の二次側を経て工
場や家庭の蛇口から流出する。又、工場や家庭での水の
使用がなくなり、流出口側の二次側の水圧が流入口側の
一次側の水圧と同水圧以上になると、逆止弁はバネの付
勢力で移動して流入口を内側から閉じる。これによっ
て、二次側の水が給水管の一次側、ひいては給水本管に
逆流するのを確実に防止し、所期の効果を奏する。2. Description of the Prior Art The applicant of the present invention has proposed a backflow preventer as described above in Japanese Patent Application Laid-Open No. 9-137869. The backflow preventer of this prior proposal communicates with the upstream side of the branch-shaped water supply pipe in the housing and the inflow port connecting the primary side, which is the water supply pipe from the water tank, with the above-mentioned inflow port, and in the downstream of the water supply pipe. There is one
An outflow port connecting one or a plurality of secondary sides, and a check valve that closes the inflow port from the inside by biasing a spring to shut off the communication between the inflow port and the outflow port. Therefore, when the water on the primary side that has been pressurized to a predetermined pressure by the operation of the water supply pump from the water supply mains or the water tank reaches the inlet, the pressure of the water causes the valve body of the check valve to resist the bias. Opening, water flows through the housing and out one or more outlets, through the secondary side of the water pipe, and out of faucets in factories and homes. In addition, when the water pressure at the outlet side of the secondary side becomes equal to or higher than the water pressure at the inlet side of the primary side, the check valve moves due to the urging force of the spring. Close the inlet from the inside. This surely prevents the water on the secondary side from flowing back to the primary side of the water supply pipe, and thus back to the water supply main pipe, and has an intended effect.
【０００３】[0003]
【発明が解決しようとする課題】枝管や貯水槽に設けら
れた給水ポンプの発停の制御をするため、従来は、給水
管の二次側にフロースイッチを接続し、工場や家庭で水
栓を開いて水を使用したときに給水管の二次側の水圧が
低下するのをこのフロースイッチで検出し、水圧が所定
圧力に低下したときに給水ポンプを運転させる。又、工
場や家庭での水の使用が止み、給水ポンプが運転を継続
して給水管の二次側の水圧が所定圧力以上に高まると前
記フロースイッチはこれを検出してポンプを停める。従
って、従来は給水管の二次側に、水量を監視するフロー
スイッチを設置し、このフロースイッチと給水ポンプを
電線で接続する必要があり、特にフロースイッチを二次
側の管内の水量を監視可能に設置するのに非常に手数が
かゝる。更に、異常時に発生するウォーターハンマー
（水撃）によってフロースイッチ、圧力センサが故障す
るおそれがある。In order to control the start / stop of a water supply pump provided in a branch pipe or a water storage tank, conventionally, a flow switch is connected to the secondary side of the water supply pipe so that the water can be used at a factory or at home. The flow switch detects that the water pressure on the secondary side of the water supply pipe decreases when water is used with the plug open, and the water supply pump is operated when the water pressure decreases to a predetermined pressure. When the water supply at the factory or at home is stopped and the water supply pump continues to operate and the water pressure on the secondary side of the water supply pipe rises above a predetermined pressure, the flow switch detects this and stops the pump. Therefore, conventionally, it was necessary to install a flow switch to monitor the amount of water on the secondary side of the water supply pipe and connect this flow switch to the water supply pump with an electric wire.In particular, the flow switch monitors the amount of water in the pipe on the secondary side. It is very troublesome to install as much as possible. Furthermore, the flow switch and the pressure sensor may be damaged by a water hammer (water hammer) that occurs during an abnormality.
【０００４】[0004]
【課題を解決するための手段】そこで本発明は、給水ポ
ンプの発停を制御するスイッチを逆流防止器のハウジン
グの内部に組み込むことにより上述した問題点を解消し
たのであって、請求項１の逆流防止器は、ハウジングに
閉止壁で塞がれるスイッチ用開口部を設け、上記閉止壁
とスイッチ用開口部との間に気体を封入したダイアフラ
ムの周縁部を挟んで閉止壁をスイッチ用開口部に対し固
定してダイアフラムをハウジングの内部に収容し、上記
ダイアフラムの内部と閉止壁との間にダイアフラムの正
逆の撓み作動で電気的にＯＮ、ＯＦＦするスイッチを設
けたことを特徴とする。この場合、上記スイッチ用開口
部を塞ぐ閉止壁はカップ形であることが好ましい。そし
て、スイッチはダイアフラムの中心部に設けられた磁性
片と、上記磁性片と対向して閉止壁に設けられた近接ス
イッチからなるものでもよいし、一端部をダイアフラム
の中心部に固定され、閉止壁に向いた先端部に磁性片を
取付けた作動軸と、上記閉止壁に設けられ、内部に近接
スイッチを取付けたスイッチ収容部とからなるものでも
よく、この場合、磁性片を取付けた作動軸の先端部は、
スイッチ収容部内に摺動可能に保持することが好まし
い。又、一端部をダイアフラムの中心部に固定され、閉
止壁に向いた先端部に磁性片を取付けた作動軸は、一端
部をダイアフラム１２の中心部に固定され、他端部が閉
止壁に向いたネジ軸１６ａと、このネジ軸１６ａの他端
部にねじ込まれ、磁性片１５を取付けた先端部が閉止壁
のスイッチ収容部の筒部１７′内に進退可能に嵌合した
保持部材１６ｂと、上記保持部材をネジ軸に固定するロ
ックナット１６ｃとからなることが好ましい。更に、ス
イッチは閉止壁に設けられたスイッチ収容筒と、上記ス
イッチ収容筒のダイアフラムに向いた一端部を摺動可能
に貫通して支持された摺動軸と、上記スイッチ収容筒の
他端部に設けられた近接スイッチと、上記摺動軸の、近
接スイッチに向いた後端部に設けられた磁性片と、上記
摺動軸を付勢し、摺動軸の前端部をダイアフラムの内面
に当接させるバネとからなるものでよい。そして、総て
の場合、ダイアフラムの周縁部をハウジングのスイッチ
用開口部に固定した閉止壁には、ダイアフラムの空気圧
を加減するエアバルブを設けておくことが好ましい。SUMMARY OF THE INVENTION Therefore, the present invention has solved the above-mentioned problems by incorporating a switch for controlling the start and stop of the water supply pump inside the housing of the backflow preventer. The backflow preventer is provided with a switch opening that is closed by a closing wall in the housing, and the closing wall is sandwiched between the closing wall and the switch opening with a peripheral edge portion of a gas-sealed diaphragm. In contrast, the diaphragm is fixedly housed in the housing, and a switch for electrically turning on and off by the forward and reverse bending operation of the diaphragm is provided between the inside of the diaphragm and the closing wall. In this case, the closing wall that closes the switch opening is preferably cup-shaped. The switch may be composed of a magnetic piece provided in the center of the diaphragm and a proximity switch provided on the closing wall facing the magnetic piece, or one end of which is fixed to the center of the diaphragm to close the diaphragm. It may consist of an operating shaft having a magnetic piece attached to the end facing the wall, and a switch accommodating portion provided on the closing wall and having a proximity switch installed therein. In this case, the operating shaft having the magnetic piece attached. The tip of
It is preferably slidably held in the switch housing. In addition, one end is fixed to the center of the diaphragm, and the operating shaft with the magnetic piece attached to the tip facing the closing wall has one end fixed to the center of the diaphragm 12 and the other end facing the closing wall. And a holding member 16b that is screwed into the other end of the screw shaft 16a and has a tip end to which the magnetic piece 15 is attached and which is fitted in the tubular portion 17 'of the switch accommodating portion of the closing wall so as to be able to move back and forth. It is preferable that the lock member includes a lock nut 16c for fixing the holding member to the screw shaft. Further, the switch includes a switch housing provided on the closing wall, a slide shaft slidably supported by one end of the switch housing facing the diaphragm, and the other end of the switch housing. And a magnetic piece provided on the rear end of the sliding shaft facing the proximity switch of the sliding shaft and the sliding shaft, and the front end of the sliding shaft on the inner surface of the diaphragm. It may consist of a spring to be brought into contact. In all cases, it is preferable to provide an air valve for adjusting the air pressure of the diaphragm on the closing wall that fixes the peripheral edge of the diaphragm to the switch opening of the housing.
【０００５】[0005]
【発明の実施の形態】図示の各実施例において、Ｖは本
発明の逆流防止器、１はそのハウジングで、互いに連通
する直交した流入口２と、流出口３と、流入口２と対向
した弁取付け口４とを有し、弁取付け口は蓋４′で閉じ
られている。この蓋４′には先端を流入口２の中心に向
けた逆止弁の弁軸５の他端が固定してあり、弁軸の先端
部には流入口２を内側から塞ぐ茸形をした逆止弁の弁体
６が移動可能に取付けてあり、蓋４′と弁体の傘状鍔部
６′との間に設けたコイルバネ７が、その付勢力で弁体
の傘状鍔部６′を実線で示したように流入口の内側に押
付けて流入口を塞ぐ。ハウジング１は例えば、鋳鉄、ス
テンレスなどの鋳物やプラスチックで製造してある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the embodiments shown in the drawings, V is a backflow preventer of the present invention, and 1 is a housing thereof, which are orthogonal to each other, and have an inflow port 2, an outflow port 3 and an inflow port 2 which face each other. And a valve mounting port 4, which is closed by a lid 4 '. The other end of the valve shaft 5 of the check valve whose tip is directed to the center of the inflow port 2 is fixed to this lid 4 ', and the tip of the valve shaft has a mushroom shape that closes the inflow port 2 from the inside. The valve body 6 of the check valve is movably mounted, and the coil spring 7 provided between the lid 4'and the umbrella-shaped flange portion 6'of the valve body is urged by the coil spring 7 to urge the umbrella-shaped flange portion 6 of the valve body. As shown by the solid line, ′ is pressed against the inside of the inlet to close the inlet. The housing 1 is made of, for example, a casting such as cast iron or stainless steel or plastic.
【０００６】本発明の逆流防止器Ｖは、図４に概略を示
したように、水道水の給水本管（配水小管とも称され
る。）３０に枝状に接続した給水管３１の給水ポンプＰ
よりも下流や、給水ポンプＰを備えた貯水槽Ｔからの給
水管３１に設けられている。上記給水ポンプＰは逆流防
止器Ｖを通じ、更に下流の蛇口３２などの水使用個所に
水道水を給水するためのもので、給水ポンプＰの吐出口
は逆流防止器の流入口２に一次側給水管３１−１で接続
し、逆流防止器の流出口３は二次側給水管３１−２で蛇
口３２などの水使用個所に接続している。The backflow preventer V of the present invention has a water supply pump for a water supply pipe 31, which is connected to a main water supply pipe (also referred to as a water distribution small pipe) 30 in a branch shape, as schematically shown in FIG. P
It is provided further downstream or in the water supply pipe 31 from the water storage tank T equipped with the water supply pump P. The water supply pump P is for supplying tap water to a water use place such as the faucet 32 further downstream through the backflow preventer V, and the discharge port of the water supply pump P is the primary side water supply to the inflow port 2 of the backflow preventer. The outlet 3 of the backflow preventer is connected to a water use point such as the faucet 32 by a secondary side water supply pipe 31-2.
【０００７】給水ポンプＰが後述のように運転される
と、その吐出口から一次側の逆流防止器Ｖの流入口２に
所定の圧力で給水本管３０や貯水槽Ｔの水道水が供給さ
れ、その水圧で逆止弁の弁体６はコイルバネ７に抗して
ハウジング１の内部に押込まれ、破線で示しように弁体
６の傘状鍔部６′は流入口２を開く。これにより給水ポ
ンプＰから吐出される水道水はハウジング１の内部に流
入し、二次側の流出口３を経て蛇口３２などに供給され
る。尚、ハウジングの流出口３は１つに限定されず複数
設け、各流出口３に蛇口などに至る二次側給水管を接続
してもよい。When the water supply pump P is operated as described later, tap water in the water supply main 30 and the water tank T is supplied from the discharge port to the inlet 2 of the backflow preventer V on the primary side at a predetermined pressure. The water pressure causes the valve body 6 of the check valve to be pushed into the housing 1 against the coil spring 7, and the umbrella-shaped collar portion 6 ′ of the valve body 6 opens the inflow port 2 as shown by the broken line. As a result, the tap water discharged from the water supply pump P flows into the housing 1 and is supplied to the faucet 32 and the like through the outlet 3 on the secondary side. The number of outlets 3 of the housing is not limited to one, and a plurality of outlets 3 may be provided, and each outlet 3 may be connected to a secondary side water supply pipe leading to a faucet or the like.
【０００８】蛇口３２などでの水の使用が止んでも、給
水ポンプＰは所定圧力に達するまで運転を続けるため、
二次側の圧力は次第に高まる。これによってその高まっ
た水圧と、スプリング７の付勢力で逆止弁の弁体６は押
され、その傘状鍔部６′は実線で示したように流入口２
を内側から塞ぐと共に、後述のように給水ポンプは停ま
る。Even if the use of water at the faucet 32 is stopped, the water supply pump P continues to operate until it reaches a predetermined pressure.
The pressure on the secondary side gradually increases. As a result, the valve body 6 of the check valve is pushed by the increased water pressure and the urging force of the spring 7, and the umbrella-shaped collar portion 6 ′ of the check valve 6 is inflated as shown by the solid line.
And the water supply pump stops as described later.
【０００９】本発明は、前述したように、給水ポンプの
発停を制御するスイッチをハウジングの内部に組み込む
ために、ハウジング１に閉止壁１１で塞がれるスイッチ
用開口部１０を設け、上記閉止壁とスイッチ用開口部の
間にダイアフラム１２の周縁部を挟んで閉止壁をスイッ
チ用開口部に対し固定してダイアフラムをハウジング１
の内部に収容し、ダイアフラム内には気体、例えば空気
を一定量以上、封入し、上記ダイアフラム１２の内部と
閉止壁１１との間にダイアフラムの正逆の撓み作動で電
気的にＯＮ、ＯＦＦするスイッチ１３を設けるのであ
り、スイッチは閉止壁１１に設けられた近接スイッチ１
４と、近接スイッチを作動する磁性片１５、例えば永久
磁石片で構成し、近接スイッチのリード線１４′は閉止
壁の外に延びる。According to the present invention, as described above, in order to incorporate the switch for controlling the start and stop of the water supply pump into the housing, the housing 1 is provided with the switch opening 10 closed by the closing wall 11, and the closing is performed. The diaphragm 12 is fixed to the switch opening by sandwiching the peripheral edge of the diaphragm 12 between the wall and the switch opening to fix the diaphragm to the housing 1.
The inside of the diaphragm is filled with a certain amount of gas, for example, air, and is electrically turned on and off between the inside of the diaphragm 12 and the closing wall 11 by the forward and reverse bending operation of the diaphragm. The switch 13 is provided, and the switch is the proximity switch 1 provided on the closing wall 11.
4 and a magnetic piece 15 for operating the proximity switch, for example, a permanent magnet piece, and the lead wire 14 'of the proximity switch extends outside the closing wall.
【００１０】図１はこの発明の逆流防止器の第１実施
例、図２は同じく第２実施例、図３は同じく第３実施例
であるが、この発明の逆流防止器の実施例は上記第１、
第２、第３の実施例に限定されず、冒頭の特許請求の範
囲に記載された構成を備えていればよい。FIG. 1 is a first embodiment of a backflow preventer of the present invention, FIG. 2 is a second embodiment of the same, and FIG. 3 is a third embodiment of the present invention. First,
The invention is not limited to the second and third embodiments, and may have any of the configurations described in the claims at the beginning.
【００１１】図１の実施例ではダイアフラム１２の中心
に磁性片１５が埋め込んであり、スイッチ１３の他方の
要素である近接スイッチ１４は閉止壁１１の中心に上記
ダイアフラムと対向し貫通状に取付けてある（請求項
３）。In the embodiment shown in FIG. 1, the magnetic piece 15 is embedded in the center of the diaphragm 12, and the proximity switch 14, which is the other element of the switch 13, is attached to the center of the closing wall 11 so as to face the diaphragm and penetrate. There is (claim 3).
【００１２】給水ポンプＰの運転が停止し、図示のよう
に逆止弁の弁体６が流入口２を内側から閉じている状態
で、蛇口３２が開かれ、二次側の水道水が使用されて二
次側の水圧が所定の圧力まで下がると、ダイアフラムの
内部に封入されて圧縮状態にあった空気の復元力でダイ
アフラムは１２ａに示したように原形状に復元して二次
側に向かって膨らみ、その中心に埋め込んだ磁性片１５
は近接スイッチ１４から離れ、これにより近接スイッチ
はＯＦＦになって、そのＯＦＦの信号を給水管の上流の
給水ポンプＰや、貯水槽Ｔの給水ポンプＰのモータに入
力し、給水ポンプに運転を開始させる。これによって、
給水ポンプは一次側の水道水をハウジングを経て二次側
に供給し、蛇口３２などから流出させる。With the water supply pump P stopped operating and the check valve body 6 closing the inflow port 2 from the inside as shown in the figure, the faucet 32 is opened and tap water on the secondary side is used. When the water pressure on the secondary side drops to a predetermined pressure, the diaphragm is restored to its original shape as shown in 12a by the restoring force of the air that was enclosed in the diaphragm and was in a compressed state, and then moved to the secondary side. Magnetic piece 15 bulging toward the center and embedded in the center
Moves away from the proximity switch 14, and the proximity switch is turned off. The signal of the OFF is input to the water supply pump P upstream of the water supply pipe or the motor of the water supply pump P of the water tank T to operate the water supply pump. Let it start. by this,
The water supply pump supplies tap water from the primary side to the secondary side through the housing and causes it to flow out from the faucet 32 or the like.
【００１３】この状態で二次側での水の使用が止んでも
給水ポンプは運転を続けるので、二次側の圧力は次第に
高まる。そして、二次側の水圧が高くなると、その二次
側の水圧と、コイルバネ７の付勢力で逆止弁の弁体はハ
ウジングの流入口２を内側から閉じ、前述したように二
次側の水が一次側に逆流するのを防ぐ。そして、二次側
の水圧の高まりによってダイアフラムは内部に封入され
た空気が圧縮されて１２ｂに示したように近接スイッチ
に向かって押圧され、二次側の水圧が所定圧力よりも高
くなると磁性片は近接スイッチに近付いてスイッチをＯ
Ｎにする。そして、このＯＮの信号が給水管や貯水槽の
給水ポンプのモータに入力され、給水ポンプは運転を停
止する。In this state, the water supply pump continues to operate even if the use of water on the secondary side is stopped, so the pressure on the secondary side gradually increases. When the water pressure on the secondary side increases, the water pressure on the secondary side and the urging force of the coil spring 7 cause the check valve valve element to close the inflow port 2 of the housing from the inside. Prevent water from flowing back to the primary side. Then, due to the increase of the water pressure on the secondary side, the air enclosed in the diaphragm is compressed and pressed toward the proximity switch as shown in 12b, and when the water pressure on the secondary side becomes higher than the predetermined pressure, the magnetic piece Approaches the proximity switch and turns on the switch
Set to N. Then, this ON signal is input to the water supply pipe or the motor of the water supply pump of the water storage tank, and the water supply pump stops its operation.
【００１４】図２の実施例では、スイッチ１３は一端部
をダイアフラム１２の中心部に固定され、閉止壁１１に
向いた先端部に磁性片１５を取付けた作動軸１６と、上
記閉止壁に設けられ、内部に近接スイッチ１４を取付け
たスイッチ収容部１７とからなる（請求項４）。この実
施例ではスイッチ収容部１７は閉止壁１１と一体に設け
てあるが、別体に成して近接スイッチを取付け、閉止壁
１１の中心部に貫通状に取付けてもよい。In the embodiment shown in FIG. 2, one end of the switch 13 is fixed to the center of the diaphragm 12, and an operating shaft 16 having a magnetic piece 15 attached to the end facing the closing wall 11 and the closing wall are provided. And a switch accommodating portion 17 in which the proximity switch 14 is attached (claim 4). In this embodiment, the switch accommodating portion 17 is provided integrally with the closing wall 11, but it is also possible to attach the proximity switch as a separate body and attach it in a penetrating manner at the central portion of the closing wall 11.
【００１５】この実施例でも、給水ポンプＰの運転が停
止し、図示のように逆止弁の弁体６が流入口２を内側か
ら閉じている状態で、蛇口３２が開かれ、二次側の水道
水が使用されて二次側の水圧が所定の圧力まで下がる
と、水圧の低下によりダイアフラムは、内部に封入され
て圧縮された空気の復元力で１２ａに示したように原形
状に戻り、その中心の作動軸１６の先端部に取付けた磁
性片１５は近接スイッチ１４から離れ、これにより近接
スイッチはＯＦＦになって、そのＯＦＦの信号を給水管
や貯水槽の給水ポンプＰのモータに入力し、給水ポンプ
に運転を開始させる。従って、給水ポンプは一次側の水
道水をハウジングを経て二次側に供給し、蛇口３２など
から流出させる。Also in this embodiment, the faucet 32 is opened and the secondary side is opened in a state where the operation of the water supply pump P is stopped and the valve body 6 of the check valve is closing the inflow port 2 from the inside as shown in the figure. When tap water is used and the water pressure on the secondary side drops to a predetermined pressure, the diaphragm returns to its original shape as shown in 12a due to the restoring force of the air that is enclosed and compressed due to the drop in water pressure. The magnetic piece 15 attached to the tip of the central operating shaft 16 is separated from the proximity switch 14, whereby the proximity switch is turned off, and the OFF signal is sent to the motor of the water supply pipe or the water supply pump P of the water tank. Input and let the water supply pump start operation. Therefore, the water supply pump supplies the tap water on the primary side to the secondary side via the housing and causes it to flow out from the faucet 32 or the like.
【００１６】この状態で二次側での水の使用が止んでも
給水ポンプは運転を続けるので、二次側の圧力は次第に
高まる。そして、二次側の水圧が高くなると、その二次
側の水圧と、コイルバネ７の付勢力で逆止弁の弁体はハ
ウジングの流入口２を内側から閉じ、前述したように二
次側の水が一次側に逆流するのを防ぐ。そして、二次側
の水圧の高まりによってダイアフラムは内部に封入され
た空気が圧縮されて１２ｂに示したように近接スイッチ
に向かって押圧され、二次側の水圧が所定圧力よりも高
くなると磁性片は近接スイッチに近付いてスイッチをＯ
Ｎにする。そして、このＯＮの信号が給水管や貯水槽の
給水ポンプのモータに入力され、給水ポンプは運転を停
止する。In this state, the water supply pump continues to operate even when the use of water on the secondary side is stopped, so the pressure on the secondary side gradually increases. When the water pressure on the secondary side increases, the water pressure on the secondary side and the urging force of the coil spring 7 cause the check valve valve element to close the inflow port 2 of the housing from the inside. Prevent water from flowing back to the primary side. Then, due to the increase of the water pressure on the secondary side, the air enclosed in the diaphragm is compressed and pressed toward the proximity switch as shown in 12b, and when the water pressure on the secondary side becomes higher than the predetermined pressure, the magnetic piece Approaches the proximity switch and turns on the switch
Set to N. Then, this ON signal is input to the water supply pipe or the motor of the water supply pump of the water storage tank, and the water supply pump stops its operation.
【００１７】この図２の実施例ではスイッチ収容部１７
の作動軸１６に向いた端部に、作動軸の先端部を摺動可
能に保持する筒部１７′を図示のように設けておくと、
ダイアフラムの動きに応じて進退する磁性片１５を取付
けた作動軸の先端部をスムースにガイドし、スイッチ１
３にＯＮ、ＯＦＦ作動を確実に行わせることができる
（請求項５）。In the embodiment of FIG. 2, the switch accommodating portion 17
If a cylindrical portion 17 'for slidably holding the tip of the operating shaft is provided at the end facing the operating shaft 16 as shown in FIG.
The tip of the operating shaft, to which the magnetic piece 15 that moves forward and backward according to the movement of the diaphragm is attached, is smoothly guided, and the switch 1
It is possible to surely turn ON / OFF the No. 3 (Claim 5).
【００１８】図３の実施例のスイッチは閉止壁１１に設
けられたスイッチ収容筒１８と、上記スイッチ収容筒の
ダイアフラムに向いた一端部を摺動可能に貫通して支持
された摺動軸１９と、上記スイッチ収容筒の他端部に設
けられた近接スイッチ１４と、上記摺動軸の、近接スイ
ッチに向いた後端部に設けられた磁性片１５と、上記摺
動軸を付勢し、摺動軸の前端部をダイアフラムの内面に
当接させるバネ２０とからなる（請求項７）。スイッチ
収容筒１８を閉止壁１１の中心に貫通状に固定するた
め、閉止壁１１の中心部にはボス筒２１が設けてある。
これによって、バネ２０は摺動軸１９の前端の拡径頭部
１９′をダイアフラムの内面の中心部に押付ける。The switch of the embodiment shown in FIG. 3 has a switch housing cylinder 18 provided on the closing wall 11 and a slide shaft 19 slidably supported by one end of the switch housing cylinder facing the diaphragm. A proximity switch 14 provided at the other end of the switch housing, a magnetic piece 15 provided at a rear end of the sliding shaft facing the proximity switch, and a biasing force of the sliding shaft. , A spring 20 for bringing the front end of the sliding shaft into contact with the inner surface of the diaphragm (claim 7). A boss cylinder 21 is provided at the center of the closing wall 11 in order to fix the switch accommodating cylinder 18 in the center of the closing wall 11 in a penetrating manner.
As a result, the spring 20 presses the enlarged diameter head portion 19 'at the front end of the sliding shaft 19 against the center portion of the inner surface of the diaphragm.
【００１９】従って、この実施例でも、給水ポンプＰの
運転が停止し、図示のように逆止弁の弁体６が流入口２
を内側から閉じている状態で、蛇口３２が開かれ、二次
側の水道水が使用されて二次側の水圧が所定の圧力まで
下がると、ダイアフラムの内部に封入されて圧縮状態に
あった空気の復元力でダイアフラムは１２ａに示したよ
うに原形状に復元して二次側に向かって膨らむ。すると
ダイアフラムの内面の中心部にバネ２０で押付けられて
いた摺動軸１９もダイアフラムに伴って移動し、摺動軸
１９の後端部に取付けた磁性片１５は近接スイッチ１４
から離れ、近接スイッチはＯＦＦになって、そのＯＦＦ
の信号を給水管の上流や、貯水槽の給水ポンプＰのモー
タに入力し、給水ポンプに運転を開始させる。従って、
給水ポンプは一次側の水道水をハウジングを経て二次側
に供給し、蛇口３２などから流出させる。Therefore, in this embodiment as well, the operation of the water supply pump P is stopped, and the valve body 6 of the check valve is connected to the inlet 2 as shown in the figure.
With the tap closed from the inside, the faucet 32 was opened, tap water on the secondary side was used, and when the water pressure on the secondary side dropped to a predetermined pressure, it was sealed inside the diaphragm and was in a compressed state. Due to the restoring force of air, the diaphragm is restored to its original shape as shown in 12a and bulges toward the secondary side. Then, the sliding shaft 19 pressed by the spring 20 to the center of the inner surface of the diaphragm also moves along with the diaphragm, and the magnetic piece 15 attached to the rear end of the sliding shaft 19 causes the proximity switch 14 to move.
And the proximity switch is turned off,
Is input to the motor upstream of the water supply pipe or to the motor of the water supply pump P of the water tank to start the operation of the water supply pump. Therefore,
The water supply pump supplies tap water from the primary side to the secondary side through the housing and causes it to flow out from the faucet 32 or the like.
【００２０】この状態で二次側での水の使用が止んでも
給水ポンプは運転を続けるので、二次側の圧力は次第に
高まる。そして、二次側の水圧が高くなると、その二次
側の水圧と、コイルバネ７の付勢力で逆止弁の弁体はハ
ウジングの流入口２を内側から閉じ、前述したように二
次側の水が一次側に逆流するのを防ぐ。そして、二次側
の水圧の高まりによってダイアフラムは内部に封入され
た空気が圧縮されて１２ｂに示したように近接スイッチ
に向かって押圧され、二次側の水圧が所定圧力よりも高
くなると磁性片は近接スイッチに近付いてスイッチをＯ
Ｎにする。そして、このＯＮの信号が給水管や貯水槽の
給水ポンプのモータに入力され、給水ポンプは運転を停
止する。In this state, the water supply pump continues to operate even if the use of water on the secondary side is stopped, so the pressure on the secondary side gradually increases. When the water pressure on the secondary side increases, the water pressure on the secondary side and the urging force of the coil spring 7 cause the check valve valve element to close the inflow port 2 of the housing from the inside. Prevent water from flowing back to the primary side. Then, due to the increase of the water pressure on the secondary side, the air enclosed in the diaphragm is compressed and pressed toward the proximity switch as shown in 12b, and when the water pressure on the secondary side becomes higher than the predetermined pressure, the magnetic piece Approaches the proximity switch and turns on the switch
Set to N. Then, this ON signal is input to the water supply pipe or the motor of the water supply pump of the water storage tank, and the water supply pump stops its operation.
【００２１】閉止壁１１とダイアフラム１２で形成され
た気体を封入した空間２２の圧力を加減できるようにす
ると、スイッチ１３をＯＮ、ＯＦＦする圧力が調節可能
になる。このため、図示の各実施例では閉止壁１１に空
間２２内の圧力を加減するエアバルブ２３を設けてある
（請求項８）。閉止壁１１が、図示の各実施例のように
カップ形であると、近接スイッチに邪魔されることな
く、カップの側壁にエアバルブ２３を取付けることがで
きるので都合が良い。更に、ポンプユニットの配管内に
は常に圧力が充満しており、この圧力の高低によりダイ
アフラムの移動量が変化する。ダイヤフラムはゴム質な
ので、長期間使用した場合ゴムが劣化し、破断する可能
性があり、破断すると配管内の水圧は閉止壁に直接衝突
し、閉止壁には水圧による負荷が発生する。この時、閉
止壁の形状が平らであると、閉止壁は圧力荷重により変
形を来す。その変形を抑制するためには、閉止壁の板厚
を増すか、適宜、リブを設けるなどして剛性を増す必要
があるが、これに対し、閉止壁が図示のようにカップ形
（勿論、半球形でもよい。）であると、その水圧荷重を
分散させることができるので、上記圧力荷重による変形
を防止でき、閉止壁の肉厚を薄肉にすることができる。
尚、閉止壁に設けたセンサー挿入部の筒形突起や、エア
バルブ挿入部は、閉止壁の剛性を更に高める効果があ
る。When the pressure of the space 22 formed by the closing wall 11 and the diaphragm 12 in which the gas is enclosed can be adjusted, the pressure for turning the switch 13 on and off can be adjusted. For this reason, in each of the illustrated embodiments, the closing wall 11 is provided with an air valve 23 for adjusting the pressure in the space 22 (claim 8). If the closing wall 11 is cup-shaped as in the illustrated embodiments, it is convenient because the air valve 23 can be attached to the side wall of the cup without being disturbed by the proximity switch. Furthermore, the piping of the pump unit is constantly filled with pressure, and the amount of movement of the diaphragm changes depending on the level of this pressure. Since the diaphragm is made of rubber, the rubber may deteriorate and break when it is used for a long period of time, and when it breaks, the water pressure in the pipe directly collides with the closing wall, and a load due to water pressure is generated on the closing wall. At this time, if the shape of the closing wall is flat, the closing wall is deformed by the pressure load. In order to suppress the deformation, it is necessary to increase the plate thickness of the closing wall or to increase the rigidity by providing ribs as appropriate. On the other hand, the closing wall has a cup shape as shown (of course, If it is hemispherical, the hydraulic load can be dispersed, so that the deformation due to the pressure load can be prevented and the wall thickness of the closing wall can be made thin.
The cylindrical protrusion of the sensor insertion portion provided on the closing wall and the air valve insertion portion have the effect of further increasing the rigidity of the closing wall.
【００２２】又、図２の実施例の作動軸１６は一端部を
ダイアフラム１２の中心部に固定され、他端部が閉止壁
に向いたネジ軸１６ａと、このネジ軸１６ａの他端部に
ねじ込まれ、磁性片１５を取付けた先端部が閉止壁のス
イッチ収容部の筒部１７′内に進退可能に嵌合した保持
部材１６ｂと、上記保持部材をネジ軸に固定するロック
ナット１６ｃとからなる。このようにすると、閉止壁１
１をスイッチ用開口部１０から外し、ロックナットを弛
めて保持部材のネジ軸に対する固定位置を所望に調節す
ることによって磁性片１５と近接スイッチ１４との間の
距離を増減し、それからロックナットで再び保持部材を
ネジ軸に固定し、閉止壁１１をスイッチ開口部１０に対
して再び取付けることにより、磁性片と近接スイッチと
の間の距離の変化に基づき、スイッチ１３をＯＮ、ＯＦ
Ｆする圧力を調節できる（請求項６）。つまり、図２の
実施例はスイッチ１３をＯＮ、ＯＦＦする圧力の調節を
エアバルブ２３でも、上述した磁性片１５と近接スイッ
チ１４との間の距離の手動調整でも行うことができる。The working shaft 16 of the embodiment shown in FIG. 2 has one end fixed to the center of the diaphragm 12 and the other end facing the closing wall, and the screw shaft 16a and the other end of the screw shaft 16a. From a holding member 16b screwed into the tubular portion 17 'of the switch accommodating portion of the closing wall, the tip end portion of which is attached with the magnetic piece 15, and a lock nut 16c for fixing the holding member to the screw shaft. Become. In this way, the closing wall 1
1 is removed from the switch opening 10 and the lock nut is loosened to adjust the fixing position of the holding member with respect to the screw shaft to increase or decrease the distance between the magnetic piece 15 and the proximity switch 14, and then the lock nut. Then, the holding member is fixed to the screw shaft again, and the closing wall 11 is attached again to the switch opening 10, so that the switch 13 is turned ON and OF based on the change in the distance between the magnetic piece and the proximity switch.
The pressure for F can be adjusted (claim 6). That is, in the embodiment of FIG. 2, the pressure for turning the switch 13 on and off can be adjusted by the air valve 23 or by manually adjusting the distance between the magnetic piece 15 and the proximity switch 14 described above.
【００２３】[0023]
【発明の効果】以上で明らかなように、本発明の逆流防
止器は、ハウジングの内部に、ダイアフラムを収容固定
すると共に、ハウジングの流出口に連なった二次側圧力
によってＯＮ、ＯＦＦするスイッチを組込み、二次側圧
力によってダイアフラムを作動してハウジングの流入口
に連なった一次側の給水ポンプの運転の発停を制御する
ため、二次側に別途フロースイッチを設置する煩雑さを
解消できる。又、ダイアフラムの弾性を利用しているの
でウォータハンマ（水撃）の抑制、それに基づくスイッ
チの破損、故障も防止できる。更に、ハウジングのスイ
ッチ開口部を塞ぐ閉止壁を利用してハウジングの内部に
ダイアフラムを固定するので構造も単純で組立て易く、
生産性が良い。As is apparent from the above, the backflow preventer of the present invention accommodates and fixes the diaphragm inside the housing, and also includes a switch that is turned on / off by the secondary pressure connected to the outlet of the housing. Built-in, the diaphragm is operated by the pressure on the secondary side to control the start / stop of the operation of the water supply pump on the primary side connected to the inlet of the housing, so the complexity of installing a separate flow switch on the secondary side can be eliminated. Further, since the elasticity of the diaphragm is used, it is possible to suppress water hammer (water hammer) and prevent damage or failure of the switch based on it. Furthermore, since the diaphragm is fixed inside the housing by using the closing wall that closes the switch opening of the housing, the structure is simple and easy to assemble,
Good productivity.
【図１】本発明の逆流防止器の第１実施例の縦断面図。FIG. 1 is a vertical cross-sectional view of a first embodiment of a backflow preventer of the present invention.
【図２】本発明の逆流防止器の第２実施例の縦断面図。FIG. 2 is a vertical sectional view of a second embodiment of the backflow preventer of the present invention.
【図３】本発明の逆流防止器の更に他の一実施例の縦断
面図。FIG. 3 is a vertical sectional view of still another embodiment of the backflow preventer of the present invention.
【図４】逆流防止器の使用状態の説明図。FIG. 4 is an explanatory view of a usage state of the backflow preventer.
Ｖ 逆流防止器 Ｐ 給水ポンプ １ 逆流防止器のハウジング ２ ハウジングの流入口（一次側） ３ ハウジングの流出口（二次側） ６ 逆止弁の弁体 １０ ハウジングのスイッチ用開口部 １１ 閉止壁 １２ ダイアフラム １３ スイッチ １４ 近接スイッチ １４′ 近接スイッチのリード線 １５ 磁性片 １６ 作動軸 １７ スイッチ収容部 １８ スイッチ収容筒 １９ 摺動軸 ２０ バネ ２１ ボス筒 ２２ ダイアフラムと閉止壁との間の空間 ２３ エアノズル V backflow preventer P water supply pump 1 Backflow preventer housing 2 Housing inlet (primary side) 3 Outlet of housing (secondary side) 6 Check valve body 10 Housing opening for switch 11 closed wall 12 diaphragm 13 switch 14 Proximity switch 14 'Proximity switch lead wire 15 Magnetic pieces 16 working axes 17 Switch housing 18 switch housing 19 Sliding shaft 20 spring 21 boss tube 22 Space between diaphragm and closing wall 23 Air nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山中 守 東京都足立区綾瀬３−24−６ 株式会社佐 山製作所内 (72)発明者 佐山 公則 東京都足立区綾瀬３−24−６ 株式会社佐 山製作所内 Ｆターム(参考） 3H058 AA03 BB22 BB36 CC01 CD05 CD29 EE02 EE14 3H065 AA01 BB15 BB16 BB24 CA01 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Mamoru Yamanaka 3-24-6 Ayase, Adachi-ku, Tokyo Sa Co., Ltd. Inside the mountain factory (72) Inventor, Kiminori Sayama 3-24-6 Ayase, Adachi-ku, Tokyo Sa Co., Ltd. Inside the mountain factory F term (reference) 3H058 AA03 BB22 BB36 CC01 CD05 CD29 EE02 EE14 3H065 AA01 BB15 BB16 BB24 CA01
Claims (8)
と、バネの付勢により上記流入口を内側から閉じて流入
口と流出口との連通を遮断する逆止弁とをハウジングに
備えた逆流防止器において、 上記ハウジングに閉止壁で塞がれるスイッチ用開口部を
設け、上記閉止壁とスイッチ用開口部との間に気体を封
入したダイアフラムの周縁部を挟んで閉止壁をスイッチ
用開口部に対し固定してダイアフラムをハウジングの内
部に収容し、上記ダイアフラムの内部と閉止壁との間に
ダイアフラムの正逆の撓み作動で電気的にＯＮ、ＯＦＦ
するスイッチを設けたことを特徴とする逆流防止器。1. An inflow port, an outflow port communicating with the inflow port, and a check valve for closing the inflow port and the outflow port from each other by closing the inflow port from the inside by a biasing force of a spring. In the backflow preventer, the housing is provided with a switch opening that is closed by a closing wall, and the closing wall is switched with a peripheral edge of a gas-sealed diaphragm interposed between the closing wall and the switch opening. The diaphragm is fixed to the opening for housing and the diaphragm is housed inside the housing, and the diaphragm is electrically turned on and off between the inside of the diaphragm and the closing wall by the forward and reverse bending operation of the diaphragm.
A backflow preventer characterized by being provided with a switch.
上記スイッチ用開口部を塞ぐ閉止壁はカップ形であるこ
とを特徴とする逆流防止器。2. The backflow preventer according to claim 1,
The backflow preventer, wherein the closing wall that closes the switch opening is cup-shaped.
の逆流防止器において、スイッチはダイアフラムの中心
部に設けられた磁性片と、上記磁性片と対向して閉止壁
に設けられた近接スイッチからなることを特徴とする逆
流防止器。3. The backflow preventer according to claim 1, wherein the switch is provided on a magnetic piece provided at a central portion of the diaphragm, and on a closing wall facing the magnetic piece. A backflow preventer characterized by comprising a proximity switch.
の逆流防止器において、スイッチは一端部をダイアフラ
ムの中心部に固定され、閉止壁に向いた先端部に磁性片
を取付けた作動軸と、上記閉止壁に設けられ、内部に近
接スイッチを取付けたスイッチ収容部とからなることを
特徴とする逆流防止器。4. The backflow preventer according to claim 1, wherein the switch has one end fixed to the center of the diaphragm, and a magnetic piece attached to the tip facing the closing wall. A backflow preventer, comprising: a working shaft; and a switch accommodating portion provided in the closing wall and having a proximity switch mounted therein.
磁性片を取付けた作動軸の先端部は、スイッチ収容部内
に摺動可能に保持されていることを特徴とする逆流防止
器。5. The backflow preventer according to claim 4,
The backflow preventer, wherein the tip of the actuating shaft to which the magnetic piece is attached is slidably held in the switch housing.
の逆流防止器において、一端部をダイアフラムの中心部
に固定され、閉止壁に向いた先端部に磁性片を取付けた
作動軸は、一端部をダイアフラム１２の中心部に固定さ
れ、他端部が閉止壁に向いたネジ軸１６ａと、このネジ
軸１６ａの他端部にねじ込まれ、磁性片１５を取付けた
先端部が閉止壁のスイッチ収容部の筒部１７′内に進退
可能に嵌合した保持部材１６ｂと、上記保持部材をネジ
軸に固定するロックナット１６ｃとからなることを特徴
とする逆流防止器。6. The backflow preventer according to claim 4, wherein one end is fixed to a central portion of the diaphragm, and a magnetic piece is attached to a tip end facing the closing wall. The shaft has one end fixed to the center of the diaphragm 12 and the other end directed toward the closing wall, and a screw shaft 16a screwed into the other end of the screw shaft 16a to attach the magnetic piece 15 to the end. A backflow preventer comprising a holding member 16b fitted in a tubular portion 17 'of a switch accommodating portion of a closing wall so as to be able to move forward and backward, and a lock nut 16c for fixing the holding member to a screw shaft.
の逆流防止器において、スイッチは閉止壁に設けられた
スイッチ収容筒と、上記スイッチ収容筒のダイアフラム
に向いた一端部を摺動可能に貫通して支持された摺動軸
と、上記スイッチ収容筒の他端部に設けられた近接スイ
ッチと、上記摺動軸の、近接スイッチに向いた後端部に
設けられた磁性片と、上記摺動軸を付勢し、摺動軸の前
端部をダイアフラムの内面に当接させるバネとからなる
ことを特徴とする逆流防止器。7. The backflow preventer according to any one of claims 1 and 2, wherein the switch comprises a switch housing provided on a closing wall and one end of the switch housing facing the diaphragm. A sliding shaft pierced slidably and supported, a proximity switch provided at the other end of the switch housing, and a magnetic pole provided at the rear end of the sliding shaft facing the proximity switch. A backflow preventer comprising one piece and a spring for urging the sliding shaft to bring the front end of the sliding shaft into contact with the inner surface of the diaphragm.
載の逆流防止器において、ダイアフラムの周縁部をハウ
ジングのスイッチ用開口部に固定した閉止壁には、ダイ
アフラムの空気圧を加減するエアバルブが設けてあるこ
とを特徴とする逆流防止器。8. The backflow preventer according to any one of claims 1 to 7, wherein air pressure of the diaphragm is adjusted by a closing wall having a peripheral edge of the diaphragm fixed to a switch opening of the housing. A backflow preventer characterized by being provided with an air valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001204585A JP2003021260A (en) | 2001-07-05 | 2001-07-05 | Backflow preventing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001204585A JP2003021260A (en) | 2001-07-05 | 2001-07-05 | Backflow preventing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003021260A true JP2003021260A (en) | 2003-01-24 |
Family
ID=19041026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001204585A Pending JP2003021260A (en) | 2001-07-05 | 2001-07-05 | Backflow preventing unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003021260A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012102779A (en) * | 2010-11-09 | 2012-05-31 | Ebara Corp | Check valve with orifice |
| CN107448617A (en) * | 2017-09-11 | 2017-12-08 | 广东溢达纺织有限公司 | Automation valve mechanism for eluting water integration apparatus |
| CN109084058A (en) * | 2018-11-01 | 2018-12-25 | 安徽省屯溪高压阀门有限公司 | One kind is from pressure release type check-valves |
| CN112096932A (en) * | 2020-09-11 | 2020-12-18 | 无锡文森特阀业有限公司 | Air suction water stop valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0618027A (en) * | 1991-07-18 | 1994-01-25 | Yamada Keisuke | Gas safety device |
| JPH0932100A (en) * | 1995-07-25 | 1997-02-04 | Sekisui Chem Co Ltd | Abnormality detecting device for vacuum valve unit |
| JPH09137869A (en) * | 1995-09-11 | 1997-05-27 | Sayama Seisakusho:Kk | Non-return gate valve |
-
2001
- 2001-07-05 JP JP2001204585A patent/JP2003021260A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0618027A (en) * | 1991-07-18 | 1994-01-25 | Yamada Keisuke | Gas safety device |
| JPH0932100A (en) * | 1995-07-25 | 1997-02-04 | Sekisui Chem Co Ltd | Abnormality detecting device for vacuum valve unit |
| JPH09137869A (en) * | 1995-09-11 | 1997-05-27 | Sayama Seisakusho:Kk | Non-return gate valve |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012102779A (en) * | 2010-11-09 | 2012-05-31 | Ebara Corp | Check valve with orifice |
| CN107448617A (en) * | 2017-09-11 | 2017-12-08 | 广东溢达纺织有限公司 | Automation valve mechanism for eluting water integration apparatus |
| CN109084058A (en) * | 2018-11-01 | 2018-12-25 | 安徽省屯溪高压阀门有限公司 | One kind is from pressure release type check-valves |
| CN109084058B (en) * | 2018-11-01 | 2023-09-05 | 安徽省屯溪高压阀门股份有限公司 | Self-pressure-relief check valve |
| CN112096932A (en) * | 2020-09-11 | 2020-12-18 | 无锡文森特阀业有限公司 | Air suction water stop valve |
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