JPH01183710A - Water level controller - Google Patents

Water level controller

Info

Publication number
JPH01183710A
JPH01183710A JP647588A JP647588A JPH01183710A JP H01183710 A JPH01183710 A JP H01183710A JP 647588 A JP647588 A JP 647588A JP 647588 A JP647588 A JP 647588A JP H01183710 A JPH01183710 A JP H01183710A
Authority
JP
Japan
Prior art keywords
water level
water
valve
control circuit
float
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
Application number
JP647588A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Hanada
花田 義幸
Koichi Matsuyama
松山 浩一
Yukio Kobata
木幡 幸雄
Toshiharu Oe
俊春 大江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Toto Ltd
Original Assignee
Toto Ltd
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toto Ltd, Kawasaki Steel Corp filed Critical Toto Ltd
Priority to JP647588A priority Critical patent/JPH01183710A/en
Publication of JPH01183710A publication Critical patent/JPH01183710A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain a compact water level controller having high accuracy and high reliability by connecting serially between an electrical open/close valve that works via a water level sensor and a switch that works via a float put in a water tank. CONSTITUTION:The drop of the water level is detected by a level sensor 5 and an open/close valve 3 is energized at a fixed water level via a control circuit 4. Then the water is supplied to a water tank 1 via a supply pipe 2. The energization of the valve 3 is discontinued and the valve 3 is closed at a prescribed water level. Thus the supply of water is cut. If the circuit 4 does not close the valve 3 even at a prescribed water level owing to a trouble of the sensor 5, a switch means 8 is driven by a float 6. Thus the energization of the valve 3 is cut and the valve 3 is closed. In such a constitution, the structure of a water level controller is simplified with no use of a ball tap mechanism. Thus the accuracy and the reliability of an electrical system are improved for the water level controller.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、貯水槽内の水位を一定に維持するように給
水弁の開閉を実行する水位制御装置に係り、#に水位制
御装置の電気系統の改善に関する。
Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a water level control device that opens and closes a water supply valve to maintain a constant water level in a water storage tank. Concerning system improvement.

(従来の技術) 第4図乃至第7図は従来の水位制御装置を示す、第4図
は所謂ボールタップを用いた水洗器の水位制御を示すも
のである。同図によれば、貯水槽1内に中空プラスチッ
ク性のフロート6を浮かせである。このフロート6はア
ーム7を介して給水管2側に固定したリンク機構11に
連結しである。リンク機構12の他端には給水管2の内
部に配置した開閉弁12が連結してあり、フロート6に
従ってアームの運動に伴って駆動される。リンク11は
、貯水槽l内の水位が上昇しボールタップのポール6が
アーム7の支点を中心にして回転し始めると、リンクア
ームが開閉弁12を引き下げ、また水位が低下するとア
ーム7は前述とは逆に回転しリンクアームが開閉弁12
を押し上げるように構成されている。
(Prior Art) Fig. 4 to Fig. 7 show conventional water level control devices, and Fig. 4 shows water level control of a water washer using a so-called ball tap. According to the figure, a hollow plastic float 6 is suspended in a water storage tank 1. This float 6 is connected via an arm 7 to a link mechanism 11 fixed to the water supply pipe 2 side. An on-off valve 12 disposed inside the water supply pipe 2 is connected to the other end of the link mechanism 12, and is driven by the movement of the arm according to the float 6. When the water level in the water tank l rises and the ball tap pole 6 begins to rotate around the fulcrum of the arm 7, the link arm pulls down the on-off valve 12, and when the water level falls, the arm 7 moves as described above. rotates in the opposite direction, and the link arm opens and closes the valve 12.
It is designed to push up.

以上からも理解されるが、貯水槽1内の水が排出されて
水位が一定以下に下がると、ボールタップのポール6の
浮力に対して給水管2の水圧が相射的に大きくなるため
、開閉弁lは水圧と共に押し下げられて給水管2から貯
水槽lへの給水が実行される。この結果、貯水槽l内の
水位が上昇するに従ってポール6も上昇し、逐にはポー
ル6の浮力が給水管2の水圧に打ち勝って開閉弁12に
より給水管2を閉塞し、給水を遮断する。
As can be understood from the above, when the water in the water tank 1 is discharged and the water level drops below a certain level, the water pressure in the water supply pipe 2 increases reciprocally with respect to the buoyancy of the ball tap pole 6, which causes the water to open and close. The valve l is pushed down together with the water pressure, and water is supplied from the water supply pipe 2 to the water tank l. As a result, as the water level in the water tank 1 rises, the pole 6 also rises, and the buoyancy of the pole 6 eventually overcomes the water pressure in the water supply pipe 2, causing the on-off valve 12 to close the water supply pipe 2 and cut off the water supply. .

このようなボールタップ型の水位制御装置ではフロート
6の上下により開閉弁を駆動するものであり制御精度に
欠けるため、第5図に示すように電気的手段を組合わせ
たものも提案されている。
In such a ball tap type water level control device, the opening/closing valve is driven by the vertical movement of the float 6 and lacks control accuracy, so a device combining electric means as shown in FIG. 5 has also been proposed.

すなわち、第4図の従来装置と同様のボールタップを給
水管2に配備すると共に、貯水槽l内に水位センサ5を
配備しこのセンサ5の出力信号に基づき制御回路4を作
動させ電磁弁などの電気的開閉弁3を駆動していた。こ
こで、水位センサ5は各種のものが知られており、例え
ばスイッチ式のもの、抵抗値可変型のものなどがある。
That is, a ball tap similar to the conventional device shown in FIG. 4 is installed in the water supply pipe 2, and a water level sensor 5 is installed in the water tank l, and the control circuit 4 is actuated based on the output signal of this sensor 5 to control solenoid valves, etc. The electric on-off valve 3 was driven. Various types of water level sensors 5 are known, such as a switch type and a variable resistance type.

スイッチ式のものは、センサ5の円柱部分5aに遊動自
在に環装させたフロー)5bに磁石などを備え1円柱部
分5a内の所定水位に配置したリードスイッチなどを作
動させるものである。また、抵抗値可変型のものは、円
柱部分に直列に印刷した抵抗をフロートにより短絡させ
て抵抗値変化を読み取るようにしたものである。
In the switch type, a magnet or the like is attached to a flow pipe 5b which is movably attached to a cylinder part 5a of the sensor 5, and a reed switch or the like placed at a predetermined water level in one cylinder part 5a is actuated. The variable resistance type has resistors printed in series on a cylindrical portion and short-circuited by a float to read the change in resistance value.

このような装置によれば、水の使用により貯水槽lの水
位が下がったことを水位センサ5が感知して制御回路4
を作動させることにより開閉弁3を開き給水管2から水
を供給する。これにより貯水槽1の水位が上がり一定水
位以上になったことを再度水位センサ5が検知し、電磁
弁3を閉じる。このため、貯水槽l内の水が一度使用さ
れても、常に一定水位に貯水されることとなる。ここで
、水位センサ5などの電気系統が故障して閉じるべき電
磁弁3が閉じなくとも、ボールタップの開閉弁12(第
5図では図示せず)により給水が停止される。
According to such a device, the water level sensor 5 senses that the water level in the water tank l has decreased due to the use of water, and the control circuit 4
By operating the on-off valve 3, water is supplied from the water supply pipe 2. As a result, the water level sensor 5 again detects that the water level in the water tank 1 has risen to a certain level or higher, and the solenoid valve 3 is closed. Therefore, even if the water in the water tank l is used once, it will always be stored at a constant water level. Here, even if the electromagnetic valve 3 that should be closed does not close due to a failure in the electrical system such as the water level sensor 5, the water supply is stopped by the ball tap on-off valve 12 (not shown in FIG. 5).

以上からするに、第4図によればボールタップに°よる
検出水位の精度が悪いという欠点があったものを、第5
図の従来装置では水位センサ5の使用により解決し、し
かも電気部品の信頼性の低さをボールタップとの併用と
いう方向により解消していた。
From the above, it can be concluded that the ball tap, which had the disadvantage of poor accuracy in water level detection according to Figure 4, has been replaced with the fifth
In the conventional device shown in the figure, the problem was solved by using the water level sensor 5, and the low reliability of the electric parts was solved by using it in combination with a ball tap.

(発明が解決しようとする問題点) しかし、いずれの従来技術によってもボールタップを使
用していることに起因し、供給水圧に打ち勝って開閉弁
を閉じるに必要な浮力を発生させる必要があるため、ポ
ールやアーム等の部品が大きくなり小型化が困難であっ
た。
(Problems to be Solved by the Invention) However, due to the use of ball taps in any of the conventional techniques, it is necessary to generate the buoyancy necessary to overcome the supply water pressure and close the on-off valve. Parts such as poles and arms became large, making it difficult to downsize.

この点を解決するため、第6図及び第7図に示すような
ダイヤプラム16を用いた水位制御装置も知られている
。すなわち、この種の従来装置によれば、給水管2の一
端13を閉じてチャンバ14を形成し、このチャンバ1
4内からL字状に外部に伸長する吐水管15を組合せて
いる。このチャンバ13と吐水管15の開口部分を一連
に塞ぐようにダイヤフラム16を敷設する。ダイヤフラ
ム16は小孔17を有する。また、チャンバ14自身も
ダイヤフラム16により塞がれたとは逆の面に小貫通孔
18を有し、支点19で支持されたアーム7の一端20
により閉塞される。水位が上昇しており、アーム7の端
部20がチャンバ14の孔18を塞いでいる場合には、
小孔17から流入する供給水の水圧によりダイヤフラム
16は吐水孔15を閉塞する(第6図)、また、水の使
用により水位が低下すると、アーム7の一端20がチャ
ンバ14の貫通孔18を開放するため、供給水はダイヤ
フラム16の小孔17及び貫通孔18から流出し、加圧
されることがない。
To solve this problem, a water level control device using a diaphragm 16 as shown in FIGS. 6 and 7 is also known. That is, according to this type of conventional device, one end 13 of the water supply pipe 2 is closed to form a chamber 14, and the chamber 14 is closed.
A water discharge pipe 15 extending from inside 4 to the outside in an L-shape is combined. A diaphragm 16 is installed so as to block the chamber 13 and the opening of the water discharge pipe 15 in series. The diaphragm 16 has a small hole 17. Further, the chamber 14 itself also has a small through hole 18 on the opposite side from the side covered by the diaphragm 16, and one end 20 of the arm 7 supported at the fulcrum 19.
is occluded by If the water level is rising and the end 20 of the arm 7 blocks the hole 18 in the chamber 14, then
The diaphragm 16 closes the water outlet 15 due to the water pressure of the supply water flowing in from the small hole 17 (FIG. 6). Also, when the water level decreases due to the use of water, one end 20 of the arm 7 closes the through hole 18 of the chamber 14. Since it is open, the supply water flows out through the small holes 17 and through holes 18 of the diaphragm 16 and is not pressurized.

従って、ダイヤフラム16も押圧されることなく吐水管
15の開口端から開放され、供給水は給水管2から直ち
に遂行15へと流れ込む(第7図)。
Therefore, the diaphragm 16 is also released from the open end of the water discharge pipe 15 without being pressed, and the supply water immediately flows from the water supply pipe 2 into the discharge pipe 15 (FIG. 7).

このようなダイヤフラム式の装置によれば小型化はある
程度可能であるが、ダイヤフラムを吐水孔側に押圧する
ために逆に十分な水圧を必要とした。また、水温が上昇
する場合を考えてダイヤフラムの材料を選定し、又は耐
久性を考慮するなど設計の自由度における制限が大きく
なっていた。
Although such a diaphragm type device can be downsized to some extent, it requires sufficient water pressure to press the diaphragm toward the water spout. In addition, the degree of freedom in design has been greatly restricted, such as selecting the material of the diaphragm in consideration of the possibility that the water temperature will rise, or considering durability.

従って、この発明は、小型で動作精度が高く設計の自由
度に無用の制限のない簡易な水位制御装置を提供するこ
とを目的とする。
Therefore, an object of the present invention is to provide a simple water level control device that is small, has high operational accuracy, and does not have unnecessary restrictions on the degree of freedom in design.

(問題点を解決するための手段並びに作用)この目的を
達成するため、この発明によれば。
(Means and effects for solving the problem) To achieve this object, according to the present invention.

貯水槽lへの給水管2の途中に設けた電動式開閉弁3と
、この開閉弁3をオンオフ駆動する駆動信号を形成する
制御回路4と、前記貯水槽l内に設首し所定の水位で前
記制御回路4の水位信号を供給する水位センサ5と、前
記貯水槽内に浮遊自在に支持したフロート6の位置に応
答して作動するスイッチ手段8とを備え、 前記電動式開閉弁3と前記スイッチ手段8とは電気的に
直列に接続され前記制御回路4に接続するようにする。
An electric on-off valve 3 installed in the middle of the water supply pipe 2 to the water tank l, a control circuit 4 for forming a drive signal to turn on and off the on-off valve 3, and a control circuit 4 installed in the water storage tank l to maintain a predetermined water level. a water level sensor 5 that supplies a water level signal to the control circuit 4; and a switch means 8 that operates in response to the position of a float 6 supported in the water storage tank in a freely floating manner; The switch means 8 is electrically connected in series with the control circuit 4 .

このような構成によれば、ボールタップ機構を用いない
ため構造を簡略化でき、また水位センサ5により精度良
く水位制御が達成できると共に、フロート6でスイッチ
手段を駆動することにより電気系統の信頼性を高めるこ
とができる。
According to such a configuration, the structure can be simplified because no ball tap mechanism is used, and water level control can be achieved with high accuracy using the water level sensor 5, and reliability of the electrical system can be improved by driving the switch means with the float 6. can be increased.

(実施例) 以下、添付図面に従ってこの発明の詳細な説明する。な
お、各図面において同一の符号は同様の対象を示すもの
とする。
(Example) The present invention will be described in detail below with reference to the accompanying drawings. Note that the same reference numerals in each drawing indicate similar objects.

第1図はこの発明の実施例に係る水位制御装置を示す系
統図である。同図において、1は貯水槽、2は給水管、
3は電磁弁等の電動式開閉弁、4は制御回路、5は水位
センサ、6はフロート、7はフロートアーム、8はスイ
ッチ手段である。
FIG. 1 is a system diagram showing a water level control device according to an embodiment of the present invention. In the figure, 1 is a water tank, 2 is a water supply pipe,
3 is an electric on-off valve such as a solenoid valve, 4 is a control circuit, 5 is a water level sensor, 6 is a float, 7 is a float arm, and 8 is a switch means.

これらの構成要素のうち主要なものを説明する。The main components will be explained below.

貯水槽1は排出口から必要な水洗器(図示せず)などに
水を排出し、給水管2からの給水により貯水が可能であ
る。給水管2からの吐水並びに吐水停止を開閉弁3が実
行する。開閉弁3は、例えば通電時のみに開いており非
通電時には閉じている種類のものとする。フロート6は
スイッチ手段8内にアーム7を枢動自在に固定したもの
があるが、スイッチ手段8の開閉機構を付勢することが
できればよいため極めて小型のもので良い、このような
スイッチ手段8の開閉機構は例えば、第2図に示すよう
であり、アーム7によりリミットスイッチ8aの可動ア
ーム8bを付勢するようにし、又はアーム7に固定した
磁石8cによりリードスイッチ8dを付勢するようにす
ることができる。
The water storage tank 1 can store water by discharging water from an outlet into a necessary water washer (not shown) or the like, and by supplying water from a water supply pipe 2. The on-off valve 3 executes the spouting of water from the water supply pipe 2 and the stopping of water spouting. The on-off valve 3 is, for example, of a type that opens only when energized and closes when not energized. There is a type of float 6 in which an arm 7 is pivotally fixed in a switch means 8, but since it is only necessary to energize the opening/closing mechanism of the switch means 8, the float 6 may be extremely small. For example, the opening/closing mechanism is as shown in FIG. 2, and the arm 7 biases the movable arm 8b of the limit switch 8a, or the magnet 8c fixed to the arm 7 biases the reed switch 8d. can do.

電動式開閉弁3、制御回路4、及び水位センサ5などの
電気系統は第3図に示すようである。水位センサ5は抵
抗値可変型のものであり、円柱部分5aに設けた抵抗フ
ロー)5bにより一部短絡させて抵抗値変化を読み取る
。このセンサ5の出力信号は制御回路4の電圧比較器2
0に電圧信号Vとして入力され、基準信号を形成する設
定抵抗21゛による電圧はvOと比較される0例えば水
位が高いうちは、センサ5の抵抗値が低く比較器20は
何ら出力を発生しないが、水位が低下するにつれてセン
サ5の抵抗値は上昇しこれに伴い抵抗両端の電圧降下と
して現れる出力電圧Vも上昇する。この結果、検出出力
電圧Vが基準電圧V。
The electric system including the electric on-off valve 3, the control circuit 4, and the water level sensor 5 is as shown in FIG. The water level sensor 5 is of a variable resistance type, and a resistance flow 5b provided on a cylindrical portion 5a is partially short-circuited to read a change in resistance value. The output signal of this sensor 5 is applied to the voltage comparator 2 of the control circuit 4.
0 is input as a voltage signal V, and the voltage across the setting resistor 21' forming a reference signal is compared with vO. For example, when the water level is high, the resistance value of the sensor 5 is low and the comparator 20 does not generate any output. However, as the water level decreases, the resistance value of the sensor 5 increases, and accordingly, the output voltage V, which appears as a voltage drop across the resistor, also increases. As a result, the detected output voltage V is the reference voltage V.

を越えると、比較器20は出力を発生して駆動回路22
を作動させる。駆動回路22は開閉弁3を作動させるに
必要な電力を供給する電力増幅器などを含む、また、第
1図及び第3図から明らかなように、開閉弁3及びスイ
ッチ手段8は電気的に直列に接続されており、駆動回路
22即ち制御回路の直列負荷となっている。
, the comparator 20 generates an output and drives the drive circuit 22.
Activate. The drive circuit 22 includes a power amplifier that supplies the power necessary to operate the on-off valve 3, and as is clear from FIGS. 1 and 3, the on-off valve 3 and the switch means 8 are electrically connected in series. , and serves as a series load of the drive circuit 22, that is, the control circuit.

次に、この実施例の動作を説明する。水位の低下は、前
述のように水位センサ5が検出し制御回路の比較器20
で基準電圧Voと比較され、給水を開始すべき一定の水
位で比較器20は出力を発生する。このため、それまで
閉じていた開閉弁3が開き給水管2を介して貯水槽lに
水が供給される。この給水に伴い、水位センサ5のフロ
ート5bが上昇すると所定の水位で比較器20は再度出
力をゼロにする。ここで、開閉弁3への通電は停止され
開閉弁3は閉じ給水は遮断される。この時、水位センサ
5の故障により規定水位を越えても制御回路4が駆動回
路22の出力を遮断しない場合には、フロート6により
スイッチ手段8が駆動開成されて、駆動回路22の出力
は停止し開閉J「3は閉じる。
Next, the operation of this embodiment will be explained. As mentioned above, the water level sensor 5 detects the drop in the water level, and the comparator 20 of the control circuit detects the drop in the water level.
is compared with the reference voltage Vo, and the comparator 20 generates an output at a certain water level at which water supply should start. Therefore, the on-off valve 3, which had been closed until then, opens and water is supplied to the water tank l via the water supply pipe 2. When the float 5b of the water level sensor 5 rises with this water supply, the comparator 20 again sets its output to zero at a predetermined water level. Here, the power supply to the on-off valve 3 is stopped, the on-off valve 3 is closed, and the water supply is cut off. At this time, if the control circuit 4 does not cut off the output of the drive circuit 22 even if the water level exceeds the specified level due to a malfunction of the water level sensor 5, the switch means 8 is activated by the float 6 and the output of the drive circuit 22 is stopped. Open/close J “3 is closed.

(発明の効果) この発明によれば、以上のように電気的開閉弁及びスイ
ッチ手段の双方を電気的に直列に接続し、電気的開閉弁
を水位センサで作動させまた貯水槽内のフロートでスイ
ッチ手段を作動させるようにしたことにより、次のよう
な効果を奏する水位制御装置を得ることができる。
(Effect of the invention) According to the present invention, as described above, both the electric on-off valve and the switch means are electrically connected in series, and the electric on-off valve is operated by the water level sensor, and the float in the water tank is operated by the water level sensor. By activating the switch means, it is possible to obtain a water level control device that has the following effects.

(1)従来のようなボールタップを使用しないため、構
造の小型化が可能となる。
(1) Since a conventional ball tap is not used, the structure can be made smaller.

(2)電気的水位センナの使用により、精度の良い水位
制御装置が可能となる。
(2) The use of an electric water level sensor enables a highly accurate water level control device.

(3)電気的水位センサの誤動作をフロートに連動させ
たスイッチで保護でき、安全確実で信頼性の高い水位制
御が可能となる。
(3) Malfunctions of the electrical water level sensor can be protected by a switch linked to the float, making safe, reliable and highly reliable water level control possible.

(4)電気的水位センサの誤動作を保護するスイッチを
駆動するフロートは、軽荷重のスイッチを作動させるだ
けの浮力を発生させればよく小型筒易なものとすること
ができる。
(4) The float that drives the switch that protects the electrical water level sensor from malfunction can be made small and easy to cylindrical, as long as it generates enough buoyancy to operate the lightly loaded switch.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の実施例にかかる水位制御装置の系統
図、第2図は第1図の水位制御装置の要部構成図、第3
図はこの発明の実施例に係る水位制御装置の電気系統図
、第4図乃至第7図は従来装置の説明図である。 図面において、1は貯水槽、2は給水管、3は電動式開
閉弁、4は制御回路、5は電気的水位センサ、6はフロ
ート、7はアーム、8はスイッチ手段である。
FIG. 1 is a system diagram of a water level control device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of main parts of the water level control device shown in FIG. 1, and FIG.
The figure is an electrical system diagram of a water level control device according to an embodiment of the present invention, and FIGS. 4 to 7 are explanatory diagrams of conventional devices. In the drawings, 1 is a water tank, 2 is a water supply pipe, 3 is an electric on-off valve, 4 is a control circuit, 5 is an electric water level sensor, 6 is a float, 7 is an arm, and 8 is a switch means.

Claims (1)

【特許請求の範囲】  貯水槽への給水管の途中に設けた電動式開閉弁と、こ
の開閉弁をオンオフ駆動するための駆動信号を形成する
制御回路と、前記貯水槽内に設置し所定の水位で前記制
御回路の水位信号を供給する水位センサと、前記貯水槽
内に浮遊自在に支持したフロートの位置に応答して作動
するスイッチ手段とを備え、 前記制御回路により制動される電動式開閉弁は、前記ス
イッチ手段と電気的に直列に接続され前記制御回路に接
続されていることを特徴とする水位制御装置。
[Scope of Claims] An electric on-off valve provided in the middle of a water supply pipe to a water storage tank, a control circuit for forming a drive signal for turning on and off the on-off valve, and A water level sensor that supplies a water level signal to the control circuit based on the water level, and a switch means that operates in response to the position of a float supported in the water storage tank so as to be freely floating, the electrically operated opening/closing being braked by the control circuit. A water level control device characterized in that a valve is electrically connected in series with the switch means and connected to the control circuit.
JP647588A 1988-01-14 1988-01-14 Water level controller Pending JPH01183710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP647588A JPH01183710A (en) 1988-01-14 1988-01-14 Water level controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP647588A JPH01183710A (en) 1988-01-14 1988-01-14 Water level controller

Publications (1)

Publication Number Publication Date
JPH01183710A true JPH01183710A (en) 1989-07-21

Family

ID=11639491

Family Applications (1)

Application Number Title Priority Date Filing Date
JP647588A Pending JPH01183710A (en) 1988-01-14 1988-01-14 Water level controller

Country Status (1)

Country Link
JP (1) JPH01183710A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104298261A (en) * 2014-08-22 2015-01-21 深圳朴方环保发展有限公司 Stepped water system and city and town belt close system
CN104805890A (en) * 2015-04-03 2015-07-29 四川玉树科技(集团)有限公司 Water supply tank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104298261A (en) * 2014-08-22 2015-01-21 深圳朴方环保发展有限公司 Stepped water system and city and town belt close system
CN104805890A (en) * 2015-04-03 2015-07-29 四川玉树科技(集团)有限公司 Water supply tank

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