JP2019105303A - Automatic shut-off device and automatic shut-off method capable of preventing water hammer - Google Patents

Automatic shut-off device and automatic shut-off method capable of preventing water hammer Download PDF

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JP2019105303A
JP2019105303A JP2017237812A JP2017237812A JP2019105303A JP 2019105303 A JP2019105303 A JP 2019105303A JP 2017237812 A JP2017237812 A JP 2017237812A JP 2017237812 A JP2017237812 A JP 2017237812A JP 2019105303 A JP2019105303 A JP 2019105303A
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valve
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shutoff
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JP6962169B2 (en
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直広 高取
Naohiro Takatori
直広 高取
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Sumitomo Metal Mining Co Ltd
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Abstract

To provide a less-expensive convenient automatic shut-off device capable of restricting occurrence of water hammer.SOLUTION: This invention relates to an automatic shut-off device 10 comprising a first shut-off valve 11 having preferably a nominal diameter of 2 inches or more and 18 inches or less arranged at a liquid piping system 3 and driven by a pneumatic actuator; and a second shut-off valve 12 arranged at a bypassing pipe 4 having a nominal diameter of 1 inch or more and bypassing it and preferably driven by an electric actuator, a diameter of the aforesaid second shut-off valve 12 is smaller than that of said first shut-off valve 11 and the second shut-off valve 12 is shut off preferably 0.1 second or more and 60 seconds or less after shutting-off of said first shut-off valve 11.SELECTED DRAWING: Figure 1

Description

本発明は、水撃の発生を防止することが可能な、液体配管系に設置される自動遮断装置及び自動遮断方法に関する。   The present invention relates to an automatic shutoff device and an automatic shutoff method installed in a liquid piping system capable of preventing the occurrence of a water hammer.

液体配管系にはプロセス上等の理由により遮断弁等の遮断装置が設置されているが、その遮断時に水撃（ウォーターハンマー）が発生することがあった。この水撃は、配管系を流れている水などの非圧縮性流体が、弁などが閉止することで急停止させられる結果、その運動エネルギーが圧力エネルギーに変化して配管系内を伝搬する現象である。このような水撃の発生を防止する方法としては、例えば先ず液体配管系の送水元に設けられているポンプ等の昇圧手段を停止し、液体配管系内に圧力がかからない状態にしてから遮断弁等の遮断装置を遮断することが行われている。あるいは上記の送水元の昇圧手段を停止できない場合は、コントロール弁等の流量制限手段で徐々に流量を絞ることで急激な圧力変動を抑制する方法も一般的に知られている。   In the liquid piping system, a shutoff device such as a shutoff valve is installed for reasons of process, etc., but a water hammer may occur at the time of shutoff. This water hammer is a phenomenon in which kinetic energy changes to pressure energy and propagates in the piping system as a result of incompressible fluid such as water flowing in the piping system being suddenly stopped by closing a valve etc. It is. As a method of preventing the occurrence of such a water hammer, for example, the pressure increasing means such as a pump provided at the water supply source of the liquid piping system is first stopped, and the pressure is not applied to the liquid piping system. Etc. It is performed to shut off the shutoff device. Alternatively, when it is not possible to stop the above-mentioned water supply source pressure raising means, it is generally known to suppress sudden pressure fluctuation by gradually throttling the flow rate by means of a flow control means such as a control valve.

更に、水撃を吸収するベローズ、クッション材、外付けの水室等の圧力逃がし装置を液体配管系に設置することで水撃作用を防止する技術が提案されている。例えば特許文献１には、水栓本体を開閉操作するハンドル内に、ダイヤフラムと弾性体とからなる水撃防止装置を内蔵し、この水撃防止装置へ水撃を導く導水路を水栓本体へ連通させる技術が開示されている。また、特許文献２には、水道管の途中に接続管を介して本体ケースを取付け、この本体ケース内に緩衝材と伸縮性保護膜とを内蔵させたウォーターハンマー防止器が開示されている。   Furthermore, there is proposed a technology for preventing the water hammer action by installing a pressure relief device such as a bellows for absorbing a water hammer, a cushion material, an external water chamber and the like in a liquid piping system. For example, Patent Document 1 incorporates a water hammer prevention device consisting of a diaphragm and an elastic body in a handle for opening and closing a water faucet body, and guides a water channel to the water hammer prevention device to a water faucet body A technique for communicating is disclosed. Further, Patent Document 2 discloses a water hammer preventing device in which a main body case is attached to the middle of a water pipe via a connection pipe, and a shock absorbing material and a stretchable protective film are built in the main body case.

特開平８−１７７０９２号公報Unexamined-Japanese-Patent No. 8-177092 特開平８−１４５２７１号公報JP-A-8-145271

上述した種々の水撃防止技術によりある程度水撃の発生を防止することができるものの、液体配管系内を流れる液体の圧力が高い場合や配管径が大きい場合は、遮断弁を遮断する際の急激な圧力変動を抑制することが困難であり、水撃が発生することがあった。また、既存の液体配管系に圧力逃がし装置を設置する場合は、改造工事等を含めてコストがかかりすぎることが多く、更にスペースやアクセス上の制約から設置できないことがあった。本発明は上記した事情に鑑みてなされたものであり、水撃の発生を抑制することが可能な安価で簡易な自動遮断装置及び自動遮断方法を提供することを目的としている。   Although it is possible to prevent the occurrence of water hammer to some extent by the various water hammer prevention techniques described above, when the pressure of the liquid flowing in the liquid piping system is high or when the pipe diameter is large, the rapidity in shutting off the shutoff valve It is difficult to suppress various pressure fluctuations and water hammer may occur. Moreover, when installing a pressure relief device in the existing liquid piping system, it often costs too much including remodeling work etc. Furthermore, it could not be installed from restrictions on space and access. The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide an inexpensive and simple automatic shutoff device and an automatic shutoff method capable of suppressing the occurrence of water hammer.

上述した目的を達成するため、本発明に係る自動遮断装置は、液体配管系に設けられた第１遮断弁と、これをバイパスする配管径が１インチより大きいバイパス配管に設けられた第２遮断弁とからなる自動遮断装置であって、前記第２遮断弁の口径が前記第１遮断弁の口径よりも小さく且つ該第１遮断弁の遮断後に該第２遮断弁が遮断すること特徴としている。   In order to achieve the above-mentioned object, an automatic shutoff device according to the present invention comprises a first shutoff valve provided in a liquid piping system and a second shutoff valve provided in a bypass piping having a piping diameter larger than 1 inch for bypassing the first shutoff valve. An automatic shut-off device comprising a valve, wherein the bore diameter of the second shut-off valve is smaller than the bore diameter of the first shut-off valve and the second shut-off valve shuts off after the first shut-off valve is shut off. .

また、本発明に係る自動遮断方法は、液体配管系に設けられた第１遮断弁をバイパスする配管径が１インチより大きいバイパス配管を設けると共に該バイパス配管に該第１遮断弁よりも小さい口径を有する第２遮断弁を設け、該第１遮断弁の遮断後に該第２遮断弁が遮断するように作動させることを特徴としている。   Further, in the automatic shutoff method according to the present invention, a bypass pipe whose pipe diameter for bypassing the first shutoff valve provided in the liquid pipe system is larger than 1 inch is provided and the diameter of the bypass pipe is smaller than that of the first shutoff valve. And a second shutoff valve having a second shutoff valve, the second shutoff valve being operated to shut off after the first shutoff valve is shut off.

本発明によれば、水撃を発生させることなく安価且つ簡易に液体配管系の給液を遮断することができる。   According to the present invention, it is possible to shut off the liquid supply of the liquid piping system inexpensively and easily without causing a water hammer.

本発明の実施形態に係る自動遮断装置の模式図である。1 is a schematic view of an automatic shutoff device according to an embodiment of the present invention.

以下、本発明の自動遮断装置の実施形態について図１を参照しつつ詳細に説明する。この図１に示す本発明の実施形態の自動遮断装置１０は、昇圧手段としての給水ポンプ１の吐出側であって、タンク２に接続される送水用の好適には配管径が２インチ以上１８インチ以下の給水配管系３に設置されている。この自動遮断装置１０は、該給水配管系３に設けられた第１遮断弁１１と、該第１遮断弁１１をバイパスするバイパス配管４に設けられた第２遮断弁１２とからなる。上記の給水配管系３の配管径は、一般的には上記の給水ポンプ１等の昇圧手段の能力に応じて定められ、例えば給水ポンプ１の吐出圧力が５００ｋＰａ、流量が５００ｍ３／ｈの場合は１４インチが好ましい。 Hereinafter, an embodiment of the automatic shutoff device of the present invention will be described in detail with reference to FIG. The automatic shutoff device 10 according to the embodiment of the present invention shown in FIG. 1 is on the discharge side of the water supply pump 1 as pressure raising means and preferably has a pipe diameter of 2 inches or more for water supply connected to the tank 2. It is installed in the water supply piping system 3 of an inch or less. The automatic shutoff device 10 includes a first shutoff valve 11 provided in the water supply piping system 3 and a second shutoff valve 12 provided in a bypass pipe 4 bypassing the first shutoff valve 11. The piping diameter of the above water supply piping system 3 is generally determined according to the capacity of the pressure raising means such as the above water supply pump 1 etc. For example, when the discharge pressure of water supply pump 1 is 500 kPa and the flow rate is 500 m 3 / h Is preferably 14 inches.

一方、バイパス配管４及び第２遮断弁１２のサイズは、第１遮断弁１１の遮断時に給水配管系３内での液体の圧力変動を抑制できるのであれば、できるだけ内径が小さいものが望ましいが、これら内径があまり小さすぎると流体が流れにくくなり、また、異物による詰り等の問題も生じうるため、バイパス配管４は配管径が１インチより大きいものを使用し、第２遮断弁１２の口径の下限は第１遮断弁１１の口径の１０％以上であるのが好ましい。逆に、第２遮断弁１２の口径が大きすぎると、自動遮断装置１０に求められる液体の供給停止の目的が達成されなくなるおそれがあるので、第２遮断弁１２の口径の上限は第１遮断弁１１の口径の６５％以下であるのが好ましい。   On the other hand, the size of the bypass piping 4 and the second shutoff valve 12 is preferably as small as possible in the inner diameter, as long as the pressure fluctuation of the liquid in the water supply piping system 3 can be suppressed when the first shutoff valve 11 is shut off. If the inner diameter is too small, the fluid will not flow easily, and problems such as clogging with foreign matter may occur. Therefore, use a bypass pipe 4 with a pipe diameter larger than 1 inch. The lower limit is preferably 10% or more of the diameter of the first shutoff valve 11. Conversely, if the diameter of the second shutoff valve 12 is too large, the purpose of stopping the liquid supply required for the automatic shutoff device 10 may not be achieved, so the upper limit of the diameter of the second shutoff valve 12 is the first shutoff Preferably, it is 65% or less of the diameter of the valve 11.

例えば第１遮断弁１１が１４インチの場合は、第２遮断弁１２の口径の上限は９.１インチ、下限は１.４インチが好適となるが、市販のバルブは呼び径で規格化されており、Ｂ呼称では６Ｂ（６インチ）までは１／８、１／４、３／８、１／２、１、１・１／４、１・１／２、２、２・１／２、３、４、５、及び６となり、６インチ以上３６インチ以下は２インチごとに増加し、３６インチ以上は４インチごとに増加するので、８インチが好適な上限となり、１・１／４インチ又は１・１／２インチが好適な下限となる。なお、遮断弁の口径のサイズは、一般的には該遮断弁が設けられている配管の配管径と同サイズにするのが好ましい。   For example, when the first shut-off valve 11 is 14 inches, the upper limit of the diameter of the second shut-off valve 12 is preferably 9.1 inches and the lower limit is 1.4 inches, but commercial valves are standardized by the nominal diameter. In the B name, it is 1/8, 1/4, 3/8, 1/2, 1, 1 1/4, 1 1/2, 2, 1/2 1/2 to 6 B (6 inches) , 3, 4, 5, and 6, 6 inches or more and 36 inches or less increase by 2 inches, and 36 inches or more increase every 4 inches, so 8 inches is a preferable upper limit, 11/4 The preferred lower limit is inch or 11⁄2 inch. In addition, it is preferable that the size of the bore of the shutoff valve is generally the same size as the diameter of the pipe on which the shutoff valve is provided.

第１遮断弁の種類は、液体の遮断用バルブとしての開閉時間、操作性等の要件を満たすものであれば特に限定はなく、仕切弁、ボール弁、バタフライ弁等の種々のバルブを使用することができる。一方、第２遮断弁１２は、中間開度での使用に適しているものが好ましく、例えばグローブ弁やバタフライ弁が適している。上記の第１遮断弁１１及び第２遮断弁１２は、いずれもアクチュエータで自動的に開閉されるようになっており、オペレータの操作又は所定のアルゴリズムによって該自動遮断装置１０が作動した際、第１遮断弁１１の遮断後に第２遮断弁１２が遮断するように設定されている。このように第１遮断弁１１よりも小さい口径を有する第２遮断弁１２の遮断のタイミングを、第１遮断弁１１の遮断のタイミングよりも遅らせることで、水撃現象を生じさせることなくタンク２への液体の供給を停止することが可能になる。   The type of the first shut-off valve is not particularly limited as long as it satisfies requirements such as opening and closing time as a liquid shut-off valve and operability, and various valves such as a gate valve, a ball valve, and a butterfly valve are used. be able to. On the other hand, it is preferable that the second shutoff valve 12 be suitable for use at an intermediate opening, for example, a globe valve or a butterfly valve. Both the first shut-off valve 11 and the second shut-off valve 12 are automatically opened and closed by an actuator, and when the automatic shut-off device 10 is operated by the operation of an operator or a predetermined algorithm, After the first shutoff valve 11 is shut off, the second shutoff valve 12 is set to shut off. Thus, by delaying the timing of the shutoff of the second shutoff valve 12 having a smaller diameter than the first shutoff valve 11 than the timing of the shutoff of the first shutoff valve 11, the tank 2 is not generated. It is possible to stop the supply of liquid to the

このように第２遮断弁１２の遮断のタイミングを第１遮断弁１１の遮断のタイミングよりも遅くする方法としては、これら第１及び第２遮断弁１１、１２をそれぞれ駆動する第１及び第２アクチュエータ１３、１４への信号の出力タイミングに時間差をつけること、具体的には、第１アクチュエータ１３に信号を出力してから０.１秒以上６０秒以下経過後に第２アクチュエータ１４に信号を出力するのが好ましい。この時間差が０.１秒未満では短すぎて水撃現象を防止できないおそれがある。逆にこの時間差が６０秒を超えると、自動遮断装置１０に求められる液体の供給停止の目的が達成されなくなるおそれがある。   Thus, as a method of delaying the timing of the shutoff of the second shutoff valve 12 later than the timing of the shutoff of the first shutoff valve 11, the first and second driving the first and second shutoff valves 11, 12 are described. Time difference is given to the output timing of the signal to the actuators 13 and 14. Specifically, the signal is output to the second actuator 14 after 0.1 seconds to 60 seconds have elapsed since the signal is output to the first actuator 13. It is preferable to do. If this time difference is less than 0.1 seconds, it may be too short to prevent the water hammer phenomenon. Conversely, if this time difference exceeds 60 seconds, the purpose of the liquid supply stop required for the automatic shutoff device 10 may not be achieved.

上記の０.１秒以上６０秒以下の時間差は、これら第１及び第２アクチュエータ１３、１４に互いに異なる作動方式のものを用いることによって実施してもよい。例えば、開閉動作を電動モータで行う電動式アクチュエータは、空気圧を用いて開閉動作を行う一般的な空気式アクチュエータよりも動作が遅いので、第２アクチュエータ１４を電動式にすると共に第１アクチュエータ１３を空気式にすることで上記の時間差をつけてもよい。なお、上記のように開閉時間に時間差をつけることができるのであれば、空気式に代えて、油圧式、ソレノイド式などの方式を採用してもよい。また、開閉時間に時間差をつけることができるのであれば、第１及び第２アクチュエータ１３、１４に同じ作動方式のものを用いてもよい。   The above-mentioned time difference of 0.1 seconds or more and 60 seconds or less may be implemented by using different actuation systems for the first and second actuators 13 and 14. For example, since an electric actuator that performs opening and closing operations with an electric motor is slower than a general pneumatic actuator that performs opening and closing operations using air pressure, the second actuator 14 is electrically operated and the first actuator 13 is The above time difference may be provided by making it pneumatic. In addition, as long as the opening and closing time can be delayed as described above, a hydraulic system, a solenoid system, or the like may be employed instead of the pneumatic system. In addition, as long as the opening and closing time can be differentiated, the same operation system may be used for the first and second actuators 13 and 14.

上記の第１及び第２アクチュエータ１３、１４による第１及び第２遮断弁１１、１２の開閉は、分散制御システム（ＤＣＳ）又はプログラマブルロジックコントローラ（ＰＬＣ）で制御されることが好ましい。図１にはＤＣＳ１５の信号を第１及び第２アクチュエータ１３、１４に入力することで、それぞれ第１及び第２遮断弁１１、１２を開閉させる例が示されている。   The opening and closing of the first and second shutoff valves 11 and 12 by the first and second actuators 13 and 14 is preferably controlled by a distributed control system (DCS) or a programmable logic controller (PLC). FIG. 1 shows an example in which the first and second shutoff valves 11 and 12 are opened and closed by inputting the signal of the DCS 15 to the first and second actuators 13 and 14, respectively.

第１遮断弁１１は、そのすぐ上流側及び下流側にそれぞれ上流側手動弁１６Ａ及び下流側手動弁１６Ｂが設けられているのが好ましい。同様に、第２遮断弁１２の上流側及び下流側にもそれぞれ上流側手動弁１７Ａ及び下流側手動弁１７Ｂが設けられているのが好ましい。このように各遮断弁の前後に手動弁を設置することで、当該遮断弁のメンテナンスがより容易になる上、これら手動弁の開度を適宜調整することで遮断弁を流れる流体の流量を調整することができ、より確実に水撃現象の発生を防止することが可能になる。次に、本発明の自動遮断装置の実施例について説明するが、本発明は下記の実施例に限定されるものではない。   The first shut-off valve 11 is preferably provided with an upstream manual valve 16A and a downstream manual valve 16B immediately upstream and downstream thereof. Similarly, it is preferable that an upstream manual valve 17A and a downstream manual valve 17B be provided upstream and downstream of the second shutoff valve 12, respectively. By installing manual valves before and after each shutoff valve in this way, maintenance of the shutoff valve becomes easier, and the flow rate of fluid flowing through the shutoff valve is adjusted by appropriately adjusting the opening degree of these manual valves. It becomes possible to prevent the occurrence of the water hammer phenomenon more surely. Next, an embodiment of the automatic shutoff device of the present invention will be described, but the present invention is not limited to the following embodiment.

＜実施例１＞
吐出圧力５００ｋＰａ、流量５００ｍ３／ｈの給水ポンプの吐出側の配管径１４インチの給水配管系に設置されている既設の呼び径１４インチの仕切弁からなる第１遮断弁をバイパスする配管径８インチのバイパス配管を敷設し、そのバイパス配管に呼び径８インチのグローブ弁からなる第２遮断弁を設けた。これら第１及び第２遮断弁の駆動方式はいずれも空気式アクチュエータとし、それらの作動をＤＣＳで制御した。そして、上記給水ポンプでタンクに向けて給水している最中にＤＣＳにより第１遮断弁のアクチュエータに全閉の信号を出力し、その３秒後に第２遮断弁のアクチュエータに全閉の信号を出力したところ、水撃を発生させることなく給水を遮断することができた。 Example 1
Discharge pressure 500 kPa, bypassing the first shut-off valve comprising a gate valve of nominal diameter 14 inches of existing installed in flow 500 meters 3 / h feed water piping system pipe diameter 14 inches on the discharge side of the feed pump pipe diameter 8 An inch bypass piping was laid, and the bypass piping was provided with a second shut-off valve consisting of a globe valve with a nominal diameter of 8 inches. The drive systems of these first and second shutoff valves were all pneumatic actuators, and their operation was controlled by DCS. Then, while supplying water toward the tank with the water supply pump, the DCS outputs a fully closed signal to the actuator of the first shut-off valve, and three seconds later, a fully closed signal is sent to the actuator of the second shut-off valve. As a result, it was possible to shut off the water supply without causing a water hammer.

＜比較例１＞
上記バイパス配管の第２遮断弁を最初から全閉にしておいた以外は上記実施例１と同様にして、給水ポンプでタンクに向けて給水している最中に第１遮断弁を閉じたところ、水撃現象による大きな音と衝撃が発生した。 Comparative Example 1
In the same manner as in Example 1 except that the second shutoff valve of the bypass pipe is completely closed from the beginning, the first shutoff valve is closed while water is supplied to the tank by the water supply pump The water hammer phenomenon caused a loud noise and shock.

＜比較例２＞
バイパス配管の配管径を１インチ配管にして呼び径１インチの第２遮断弁を設けた以外は、上記実施例１と同様にして第１遮断弁と第２遮断弁を３秒の時間差をつけて遮断した。その結果、バイパス配管が細すぎるため良好に液体が流れないことに起因すると思われる大きな音と衝撃を伴う水撃現象が発生した。 Comparative Example 2
The first shut-off valve and the second shut-off valve have a time difference of 3 seconds in the same manner as in Example 1 except that the diameter of the bypass piping is 1 inch and the second shut-off valve of nominal diameter 1 inch is provided. Shut off. As a result, a water hammer phenomenon accompanied by a loud noise and an impact that is considered to be caused by the fact that the liquid does not flow well because the bypass piping is too thin has occurred.

１ 給水ポンプ
２ タンク
３ 給水配管系
４ バイパス配管
１０ 自動遮断装置
１１ 第１遮断弁
１２ 第２遮断弁
１３ 第１アクチュエータ
１４ 第２アクチュエータ
１５ ＤＣＳ
１６Ａ 上流側手動弁
１６Ｂ 下流側手動弁
１７Ａ 上流側手動弁
１７Ｂ 下流側手動弁 Reference Signs List 1 water supply pump 2 tank 3 water supply piping system 4 bypass piping 10 automatic shutoff device 11 first shutoff valve 12 second shutoff valve 13 first actuator 14 second actuator 15 DCS
16A upstream manual valve 16B downstream manual valve 17A upstream manual valve 17B downstream manual valve

Claims (6)

液体配管系に設けられた第１遮断弁と、これをバイパスする配管径が１インチより大きいバイパス配管に設けられた第２遮断弁とからなる自動遮断装置であって、前記第２遮断弁の口径が前記第１遮断弁の口径よりも小さく且つ該第１遮断弁の遮断後に該第２遮断弁が遮断すること特徴とする自動遮断装置。   An automatic shut-off device comprising a first shut-off valve provided in a liquid piping system and a second shut-off valve provided in a bypass pipe having a pipe diameter larger than 1 inch for bypassing the first shut-off valve. An automatic shutoff device characterized in that the bore diameter is smaller than the bore diameter of the first shutoff valve and the second shutoff valve shuts off after the first shutoff valve is shut off. 前記第１遮断弁の口径が呼び径で２インチ以上１８インチ以下であり、前記第２遮断弁の口径が前記第１遮断弁の口径の１０％以上６５％以下であることを特徴とする、請求項１に記載の自動遮断装置。   The bore diameter of the first shut-off valve is 2 inches to 18 inches in nominal diameter, and the bore diameter of the second shut-off valve is 10% to 65% or less of the bore diameter of the first shut-off valve. The automatic shutoff device according to claim 1. 前記第１遮断弁は空気式アクチュエータで駆動され、前記第２遮断弁は電動式アクチュエータで駆動されることを特徴とする、請求項１又は２に記載の自動遮断装置。   The automatic shutoff device according to claim 1 or 2, wherein the first shutoff valve is driven by a pneumatic actuator, and the second shutoff valve is driven by a motorized actuator. 前記第１遮断弁が遮断した後、０.１秒以上６０秒以下以内に前記第２遮断弁が遮断することを特徴とする、請求項１〜３のいずれか１項に記載の自動遮断装置。   The automatic shut-off device according to any one of claims 1 to 3, wherein the second shut-off valve shuts off within 0.1 seconds to 60 seconds after the first shut-off valve is shut off. . 前記第１遮断弁及び第２遮断弁の開閉がＤＣＳ又はＰＬＣにより制御されることを特徴とする、請求項１〜４のいずれか１項に記載の自動遮断装置。   The automatic shutoff device according to any one of claims 1 to 4, wherein opening and closing of the first shutoff valve and the second shutoff valve are controlled by DCS or PLC. 液体配管系に設けられた第１遮断弁をバイパスする呼び径が１インチより大きいバイパス配管を設けると共に該バイパス配管に該第１遮断弁よりも小さい口径を有する第２遮断弁を設け、該第１遮断弁の遮断後に該第２遮断弁が遮断するように作動させることを特徴とする自動遮断方法。   A bypass pipe having a nominal diameter larger than 1 inch for bypassing the first shut-off valve provided in the liquid piping system and a second shut-off valve having a smaller diameter than the first shut-off valve are provided in the bypass pipe. (1) An automatic shutoff method characterized in that the second shutoff valve is operated to shut off after the shutoff valve is shut off.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102079879B1 (en) * 2018-12-17 2020-02-20 에스지서보(주) Moving-vane separation type hydraulic rotary actuator
CN113307450A (en) * 2021-05-27 2021-08-27 公安县佳源水务有限公司 Diversion system in sewage treatment system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05149629A (en) * 1991-11-26 1993-06-15 Harman Co Ltd Hot water supplying apparatus
JPH06273077A (en) * 1993-03-16 1994-09-30 Hitachi Ltd Apparatus and method for preventing water hammer of coolant pipe of condenser of steam turbine plant
JPH10281316A (en) * 1997-04-10 1998-10-23 Risui Kagaku Kk Emergency shutoff valve device
JP2014034005A (en) * 2012-08-09 2014-02-24 Toray Ind Inc Salt water desalination apparatus and fresh water production method
JP2016223316A (en) * 2015-05-28 2016-12-28 株式会社東芝 Cooling device for steam turbine and method of controlling the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05149629A (en) * 1991-11-26 1993-06-15 Harman Co Ltd Hot water supplying apparatus
JPH06273077A (en) * 1993-03-16 1994-09-30 Hitachi Ltd Apparatus and method for preventing water hammer of coolant pipe of condenser of steam turbine plant
JPH10281316A (en) * 1997-04-10 1998-10-23 Risui Kagaku Kk Emergency shutoff valve device
JP2014034005A (en) * 2012-08-09 2014-02-24 Toray Ind Inc Salt water desalination apparatus and fresh water production method
JP2016223316A (en) * 2015-05-28 2016-12-28 株式会社東芝 Cooling device for steam turbine and method of controlling the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102079879B1 (en) * 2018-12-17 2020-02-20 에스지서보(주) Moving-vane separation type hydraulic rotary actuator
CN113307450A (en) * 2021-05-27 2021-08-27 公安县佳源水务有限公司 Diversion system in sewage treatment system

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