JPS59187178A - Gas safety device - Google Patents
Gas safety deviceInfo
- Publication number
- JPS59187178A JPS59187178A JP6068783A JP6068783A JPS59187178A JP S59187178 A JPS59187178 A JP S59187178A JP 6068783 A JP6068783 A JP 6068783A JP 6068783 A JP6068783 A JP 6068783A JP S59187178 A JPS59187178 A JP S59187178A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pressure
- valve
- closed
- circuit
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
- F17C13/123—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for gas bottles, cylinders or reservoirs for tank vehicles or for railway tank wagons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Magnetically Actuated Valves (AREA)
- Pipeline Systems (AREA)
Abstract
Description
【発明の詳細な説明】 本発明はガス安全装置に関するものである。[Detailed description of the invention] The present invention relates to a gas safety device.
従来のガス事故防止装置は、押ボタン等のスイッチ操作
によシ、ガス配管の元栓側に近い個所に介在させた遮断
弁を開閉させることによってガス漏出事故を防止する方
式であった。そのため、ガス器具の使用及び不使用に関
係なく、このガス事故防止装置のスイッチをＯＮにして
おけば遮断弁は常時開のままとなり、スイッチの切シ忘
れがあるとガス事故防止としては全く無力であった。Conventional gas accident prevention devices prevent gas leak accidents by operating a switch such as a push button to open and close a shutoff valve located near the main valve of the gas pipe. Therefore, regardless of whether the gas appliance is in use or not, if the switch of this gas accident prevention device is turned on, the shutoff valve will remain open at all times, and if you forget to turn it off, it will be completely useless in preventing gas accidents. Met.
本発明はかかる従来の欠点に鑑みてなされたもので、ガ
ス器具を使用しているか否かの判断を管内ガス圧の変化
によシ行い、ガス器具が不使用の場合には遮断弁を閉状
態に保つもので、その植成はガス供給側に設置したガス
メータと器具を結ぶ管路に、常時閉じている遮断弁と該
遮断弁の下流側に圧力スイッチを接続し、遮断弁を開弁
するスイッチを設けると共に、一定時間ごとに該遮断弁
を開となし、該一定時間内に管内圧が設定圧以下になれ
ば遮断弁を閉となしつづける制御回路を遮断弁と圧力ス
イッチとに連動させたことを特徴とするものである。The present invention has been made in view of these conventional drawbacks, and it is possible to determine whether or not a gas appliance is being used by changing the gas pressure in the pipe, and to close the shutoff valve when the gas appliance is not in use. The system is installed by connecting a shutoff valve that is always closed and a pressure switch downstream of the shutoff valve to the pipeline connecting the gas meter installed on the gas supply side and the appliance, and then opening the shutoff valve. At the same time, a control circuit is linked to the shutoff valve and the pressure switch, which opens the shutoff valve at regular intervals and keeps the shutoff valve closed if the pipe internal pressure falls below the set pressure within the fixed time. It is characterized by the fact that
本発明の実施例を図面により説明すると、ＬＰガス用の
ガスボンベ（１）とガスメータ（２）を連結し、このガ
スメータ（２）とガスコンロ、湯沸器、ストーブ等のガ
ス器具（６）とを連結する管路（３）に電磁弁等からな
る婆断弁（４）を接続し、この遮断弁の下流側に管内圧
力によシ作動する圧力スイッチ（５）を接続しである。An embodiment of the present invention will be described with reference to the drawings. A gas cylinder (1) for LP gas and a gas meter (2) are connected, and this gas meter (2) is connected to a gas appliance (6) such as a gas stove, water heater, or stove. A cut-off valve (4) made of a solenoid valve or the like is connected to the connecting pipe line (3), and a pressure switch (5) operated by the pressure inside the pipe is connected downstream of this cut-off valve.
更に、この遮断弁（４）を操作するｆｌ］制御回路（７
）を設け、この制御回路には遮断弁（４）を開弁するス
イッチ（８）と圧力スイッチ（５）とで安全袋ｆζ００
）を形成しである。Furthermore, a control circuit (7) for operating this shutoff valve (4) is provided.
), and this control circuit includes a switch (8) for opening the shutoff valve (4) and a pressure switch (5), and a safety bag fζ00.
) is formed.
次に、ガス安全装置の制御回路（７）の−例を第２図に
基いて説明すると、遮断弁シ目弁用のスイッチ（８）と
オ１分岐部ｆｉｌ）とフリップフロップ回路は）のセッ
ト入力鬼子（２０ｔＬ） とを接続し、フリップフロ
ップ回路の一方の出力免１子（２０Ｃ）と迩・ｌ Ａ
Ｎ Ｄ回路しηの一方の入力端子（２１’ａ ）を接続
し、このＡＮＤ回路θυの出力端子（２１ｃ）と第２．
８分岐部αりαｊを介して第１インバーター回路（イ）
の入力端子（２２α）に接続し、前記オ１分岐部α９と
第２分岐部（６）とをダイオードを介して接続し、更に
該第２分岐部（１２はオニコンデンサ６℃を介してアー
スしである。第３分岐部口には第１可変抵抗０２を接続
しである。第１インバーター回路翰の出力端子（２２ｂ
）とオニコンバーター回路（ハ）の入力端子（２８α）
との間には第４分岐部α→を設ける。オニコンバーター
回路（至）の出力端子（２８ｂ）と第２インバーター回
路（ハ）の入力端子（２４α）との間には第５分岐部（
至）を設け、この第５分岐部（ハ）にはシ・２可変抵抗
０φ及び一端をアースさせた第２コンデンサ０３を接続
する。第２インｌ；−ター回路（ハ）の出力端子（２４
ｂ）はオ６分岐部αＱを介してオ１ＮＡＮＤ回路（ハ）
の一方の入力端子（２５α）に接続し、このオＩ Ｎｈ
ＮＤ回路の出力端子（２５Ｃ）とコンデンサを介してｉ
−２コンノく一ター回路（ハ）の入力端子（２６α）を
接続し、更に第２コンバーター回路（ハ）の出力端子（
２６ｂ）を前記オ１ＡＮＤ回路（ハ）の他方の入力端子
（２１Ｊ）に接続しである。Next, an example of the control circuit (7) of the gas safety device will be explained based on Fig. 2. Connect the set input pin (20tL) and connect one output isolation pin (20C) of the flip-flop circuit.
One input terminal (21'a) of the ND circuit is connected, and the output terminal (21c) of this AND circuit θυ and the second.
The first inverter circuit (A) is connected to the 8th branch α through αj.
The O1 branch α9 and the second branch (6) are connected to the input terminal (22α) of The first variable resistor 02 is connected to the third branch port.The output terminal (22b) of the first inverter circuit
) and the input terminal (28α) of the Oni converter circuit (c)
A fourth branch part α→ is provided between. A fifth branch (
(to)), and to this fifth branch (c), a C.2 variable resistor 0φ and a second capacitor 03 whose one end is grounded are connected. The output terminal (24) of the second input circuit (c)
b) is connected to the O1 NAND circuit (c) via the O6 branch αQ.
Connect to one input terminal (25α) of this OI Nh
i via the output terminal (25C) of the ND circuit and the capacitor.
- Connect the input terminal (26α) of the second converter circuit (c), and then connect the output terminal (26α) of the second converter circuit (c).
26b) is connected to the other input terminal (21J) of the O1AND circuit (c).
フリップフロップ回路（イ）の他方の出力端子（２，（
Ｍ）と第２ＡＮＤ回路（イ）の一方の入力端子（２７ｂ
）とを接読し、他方の入力端子（２７α）は前記第４分
岐部α→に接続する。この第２ＡＮＤ回路（イ）の出力
端子（２７ｃ） はトランジスタ（ハ）のベースに接
続し、エミッタはアースされ、コレクタは遮断弁（４）
に接続している。The other output terminal (2, (
M) and one input terminal (27b) of the second AND circuit (A)
), and the other input terminal (27α) is connected to the fourth branch α→. The output terminal (27c) of this second AND circuit (a) is connected to the base of the transistor (c), the emitter is grounded, and the collector is connected to the shutoff valve (4).
is connected to.
前記オ６分岐部００とオ８インバーター回路（イ）の入
力端子（２８α）とを接続し、このオ８インバーター回
路（財）の出力端子（２８ｂ）を第２ Ｎ ＡＮ Ｄ回
路（２）の一方の入力端子（２９α）に接続する。The O6 branch section 00 and the input terminal (28α) of the O8 inverter circuit (A) are connected, and the output terminal (28b) of the O8 inverter circuit (A) is connected to the 2nd NAND circuit (2). Connect to one input terminal (29α).
又、常時閉成している圧力スイッチ（５）とオフ分岐部
αのを介して第４インバーター回路Ｇｏの入力端子（８
０ｂ）を接続し、この第４インバーター回路（至）の出
力端子（８０α）を第２ Ｎ Ａ Ｎ Ｄ回路翰の他方
の入力端子（２９ｂ）に接続する。この第２ＮＡＮＤ回
路の出力端子（２９ｃ）をフリップフロップ回路（イ）
のりセラ）入力端子（２０ｂ）に接続する。In addition, the input terminal (8) of the fourth inverter circuit Go is connected via the normally closed pressure switch (5) and the off branch α.
0b) is connected, and the output terminal (80α) of this fourth inverter circuit (to) is connected to the other input terminal (29b) of the second NAND circuit. The output terminal (29c) of this second NAND circuit is connected to the flip-flop circuit (a).
(Nori Sera) input terminal (20b).
尚、本回路の電源は直流１２Ｖで、図中矢印記号部分が
それを示している。又、本実施例はＬＰガスについて説
明したか、都市ガスの場合にも使用出来ることはもちろ
んである。The power supply for this circuit is 12 V DC, which is indicated by the arrow symbol in the figure. Further, although this embodiment has been described for LP gas, it goes without saying that it can also be used for city gas.
次に、本実施例の作用について説明すると、遮断弁開弁
用のスイッチ（８）を閉にすると、フリップフロップ回
路（イ）の一方の出力端子（２０ｄ）の出力は１１他方
の出力端子（２０ｃ ）はりとなる。Next, to explain the operation of this embodiment, when the switch (8) for opening the shutoff valve is closed, the output from one output terminal (20d) of the flip-flop circuit (A) is 11, and the output from the other output terminal (20d) is 11. 20c) Becomes a beam.
従ってｆｌＡＮＤ回路Ｑ］）の出力は瞬時に９となシ、
第１コンデンサＧ力の電荷は放電される。又、第２ＡＮ
Ｄ回路（ハ）の入力端子（２７α）の入力電圧は１１他
の入力端子（２７ｂ）の入力電圧も工なのでトランジス
タ（ハ）は導通し、電磁弁等からなる遮断弁（４）は開
となる。オニコンデンサ０〃には第１可変抵抗０うを通
じて直流１２Ｖの電流が充電されるので、一定時間経過
後（本実施例では１５分）に１となる。従って第２ＡＮ
Ｄ回路（ハ）の一方の入力端子（２７α）は９となシ、
トランジスタ（ハ）は導通しなくなって遮断弁（４）が
閉となる。Therefore, the output of the flAND circuit Q]) becomes 9 instantly,
The charge on the first capacitor G is discharged. Also, 2nd AN
The input voltage of the input terminal (27α) of the D circuit (c) is 11. The input voltage of the other input terminal (27b) is also 11, so the transistor (c) is conductive and the cutoff valve (4), which is a solenoid valve, etc., is open. Become. Since the oni capacitor 0 is charged with a DC 12V current through the first variable resistor 0, the voltage becomes 1 after a certain period of time (15 minutes in this embodiment). Therefore, the second AN
One input terminal (27α) of D circuit (c) is 9,
The transistor (c) is no longer conductive and the cutoff valve (4) is closed.
この時、第２コンデンサ＆３ ｒｔ−ｚオニインバータ
ー回路Ｑ２及び第１コンバーター回路（ハ）からなるワ
ンショットマルチによシ放電されて、オｌ ＮＡＮＤ回
路（ハ）の入力端子（２５α）の入力が１となる。At this time, the one-shot multi-channel circuit consisting of the second capacitor & 3 rt-z oni inverter circuit Q2 and the first converter circuit (c) is discharged, and the input terminal (25α) of the oni NAND circuit (c) is It becomes 1.
この場合、遮断弁（４）が閉となってガス器具（６）を
使用してＧ″１゛れば管内ガス圧は低下してスイッチ（
５）は開となシ、従ってオ１ＮＡＮＤ回路（ハ）の出力
は９となる。この；１ｌＮＡＮＤ回路（ハ）の出力が０
となり、オ１ＡＮＤ回路（ｋｌ）の入力端子（ＺＩＪ）
側の入力は、第２コンバーター（ハ）のワンショットマ
ルチの働きにより瞬片にＱとなって牙１コンデンサ（３
１）の電荷が放電される。従って第２ＡＮ Ｄ回路Ｃ４
の入力端子（２７α）側の入力ば１となシ、再度トラン
ジスタ（ハ）が導通して遮断弁（４）は開となる。この
場合、ガス器具（６）を使用していなければ、一定時間
経過後（使用しているガス器具及び配管容量により異な
るから本実施例では０秒〜１５分）に、第２可変抵抗く
う■を通じて第２コンデンサ０′３が充電されて第２イ
ンバーター回路（財）の出力は９となり、第２ＮＡＮＤ
回路（２９）の入力端子（２９α）が瞬時に１となる。In this case, if the shutoff valve (4) is closed and the gas appliance (6) is used to generate G″1, the gas pressure in the pipe will decrease and the switch (
5) is left open, so the output of the 1 NAND circuit (c) is 9. This ;1l NAND circuit (c) output is 0
Then, the input terminal (ZIJ) of the O1AND circuit (kl)
The side input becomes Q in the momentary piece due to the one-shot multi function of the second converter (c) and is connected to the fang 1 capacitor (3
1) The charge is discharged. Therefore, the second AND circuit C4
When the input terminal (27α) side of the input terminal (27α) becomes 1, the transistor (c) becomes conductive again and the cutoff valve (4) becomes open. In this case, if the gas appliance (6) is not in use, the second variable resistor The second capacitor 0'3 is charged through the second NAND circuit, and the output of the second inverter circuit becomes 9.
The input terminal (29α) of the circuit (29) becomes 1 instantly.
この第２ＮＡＮＤ回路（ハ）の他の入力端子（２９ｂ
）の入力はｌのままなので、１−２ＮＡＮＤ回路ｔ２つ
の出力は瞬時に９となり、フリップフロップ回路（２ｃ
ｂにリセットパルスを送る。すると、出力部子（２（Ｍ
）の出力は９となシ、トランジスタ（ハ）は導通しなく
なって遮断弁（４）は閉のままになる。もしガス器具（
６）を使用していれば、管内のガス圧は低下して圧力ス
イッチが作動する。この場合、圧力スイッチの設定圧を
比較的高目（本実施例で１８０制Ｈ２０、ＬＰＧの場合
）にしておけば、ガスの炎が消えることはない。更に、
圧力スイッチ０〃が作動したと同時に遮断弁（４）を開
とすれば、直ちにガス圧は復帰して燃焼を続ける。この
方法を一定時間ごとに繰返し行なうものである。The other input terminal (29b) of this second NAND circuit (c)
) remains l, the output of the two 1-2 NAND circuits instantly becomes 9, and the flip-flop circuit (2c
Send a reset pulse to b. Then, the output section (2(M
The output of ) becomes 9, the transistor (c) ceases to conduct, and the shutoff valve (4) remains closed. If gas appliances (
6), the gas pressure inside the pipe will drop and the pressure switch will operate. In this case, if the set pressure of the pressure switch is set to a relatively high value (in the case of 180 H20, LPG in this embodiment), the gas flame will not go out. Furthermore,
If the shutoff valve (4) is opened at the same time as the pressure switch 0 is activated, the gas pressure will immediately return and combustion will continue. This method is repeated at regular intervals.
もしガス器具を使用していなければ遮断弁が閉となって
も、管内のガス圧が低下しないのでそのまま閉を維持し
続けるものである。If the gas appliance is not in use, even if the shutoff valve is closed, the gas pressure inside the pipe will not drop, so it will remain closed.
再度１、遮断弁（４）を開にする場合には、スイッチ（
８）を閉とすればよい。1. To open the shutoff valve (4) again, press the switch (
8) should be closed.
以上の如く、本発明はこの安全装置を作動させて遮断弁
を開くと、この遮断弁は一定時間ごとに一瞬閉じ、且つ
この遮断弁と対をなす圧力スイッチは管内圧力が設定圧
力以下に低下した場合、即ちガスを使用中、この圧力ス
イッチが開となると同時に遮断弁を開とすれば、ガス圧
は復帰して燃焼し続けることが出来るものであシ、又、
管内のガス圧が低下しない時、即ち、ガスを使用してい
ない場合には圧力スイッチは閉のままで、遮断弁は閉じ
たまま維持することによシガス漏れを防止出来るもので
あって、このように管内圧力を感知することによってガ
ス器具を使用しているか否かを判別でき極めて安全であ
る。As described above, when the safety device is activated to open the shutoff valve, the shutoff valve momentarily closes at regular intervals, and the pressure switch paired with the shutoff valve causes the pressure in the pipe to drop below the set pressure. In this case, if the pressure switch is opened while the gas is in use and the shutoff valve is opened at the same time, the gas pressure will be restored and combustion can continue.
When the gas pressure in the pipe does not drop, that is, when gas is not being used, the pressure switch remains closed and the shutoff valve remains closed to prevent gas leakage. By sensing the pressure inside the pipe, it can be determined whether or not a gas appliance is being used, making it extremely safe.
図面は本発明の実施例を示すもので、オ１図は配管図、
刈・２図は制御回路の一例を示す配線図である。
（２）はガスメータ、（３）は管路、（４）は遮断弁、
（５）は圧力スイッチ、（６）はガス器具、（７）は制
御回路。
特許出願人 中央産商株式会社The drawings show examples of the present invention, and Figure 1 is a piping diagram;
Figure 2 is a wiring diagram showing an example of a control circuit. (2) is a gas meter, (3) is a pipeline, (4) is a shutoff valve,
(5) is a pressure switch, (6) is a gas appliance, and (7) is a control circuit. Patent applicant Chuo Sansho Co., Ltd.
Claims (1)
常時閉じている遮断弁と該遮断弁の下流側に圧力スイッ
チを接続し、遮断弁を開弁するスイッチを設けると共に
、一定時間ごとに該遮断弁を閉となし、該一定時間内に
管内圧が設定圧以下になると遮断弁を開弁し、一定時間
経過後も管内圧が設定圧以上なら遮断弁を閉となし続け
る制御回路を遮断弁と圧力スイッチとに連動させたこと
を特徴とするガス安全装置。In the pipe line connecting the gas meter installed on the gas supply side and the appliance,
A pressure switch is connected to a normally closed shut-off valve and a pressure switch downstream of the shut-off valve, and a switch is provided to open the shut-off valve.The shut-off valve is closed at regular intervals, and the pipe internal pressure is The system is characterized in that a control circuit is linked to the shut-off valve and the pressure switch, which opens the shut-off valve when the pipe pressure falls below the set pressure, and continues to close the shut-off valve if the pipe internal pressure exceeds the set pressure even after a certain period of time has elapsed. Gas safety device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6068783A JPS59187178A (en) | 1983-04-08 | 1983-04-08 | Gas safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6068783A JPS59187178A (en) | 1983-04-08 | 1983-04-08 | Gas safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59187178A true JPS59187178A (en) | 1984-10-24 |
| JPH0143872B2 JPH0143872B2 (en) | 1989-09-22 |
Family
ID=13149459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6068783A Granted JPS59187178A (en) | 1983-04-08 | 1983-04-08 | Gas safety device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59187178A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2020560A1 (en) * | 2007-08-01 | 2009-02-04 | Toptron GmbH | Electronic flow sensor |
| CN103615657A (en) * | 2013-11-05 | 2014-03-05 | 江苏现代造船技术有限公司 | Natural gas transmission system of LNG power driving vessel |
| CN104033728A (en) * | 2014-06-17 | 2014-09-10 | 上海洁申实业有限公司 | Waste steel cylinder processing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255085A (en) * | 1988-08-18 | 1990-02-23 | Shigeo Tsuboi | Needle thread state control device for sewing machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569373A (en) * | 1978-11-20 | 1980-05-24 | Seihoku Sangyo Kk | Gas safety device |
-
1983
- 1983-04-08 JP JP6068783A patent/JPS59187178A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5569373A (en) * | 1978-11-20 | 1980-05-24 | Seihoku Sangyo Kk | Gas safety device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2020560A1 (en) * | 2007-08-01 | 2009-02-04 | Toptron GmbH | Electronic flow sensor |
| WO2009015895A1 (en) * | 2007-08-01 | 2009-02-05 | Toptron Gmbh | Electronic flow sensor |
| US8720469B2 (en) | 2007-08-01 | 2014-05-13 | Toptron Gmbh | Electronic flow sensor |
| EP3006812A1 (en) * | 2007-08-01 | 2016-04-13 | Toptron GmbH | Electronic flow sensor |
| US9587754B2 (en) | 2007-08-01 | 2017-03-07 | Toptron Gmbh | Electronic flow sensor |
| CN103615657A (en) * | 2013-11-05 | 2014-03-05 | 江苏现代造船技术有限公司 | Natural gas transmission system of LNG power driving vessel |
| CN104033728A (en) * | 2014-06-17 | 2014-09-10 | 上海洁申实业有限公司 | Waste steel cylinder processing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0143872B2 (en) | 1989-09-22 |
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