JPH02179434A - Checking method of leak in double cutoff gas valve - Google Patents
Checking method of leak in double cutoff gas valveInfo
- Publication number
- JPH02179434A JPH02179434A JP33243988A JP33243988A JPH02179434A JP H02179434 A JPH02179434 A JP H02179434A JP 33243988 A JP33243988 A JP 33243988A JP 33243988 A JP33243988 A JP 33243988A JP H02179434 A JPH02179434 A JP H02179434A
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- JP
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- Prior art keywords
- pressure
- leak
- valve
- chamber
- predetermined
- 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
- 238000000034 method Methods 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000005856 abnormality Effects 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
Description
この発明はガスバルブのガス漏れを検知する二重遮断ガ
スバルブのリークチェック方法に関するものである。The present invention relates to a leak check method for a double shutoff gas valve that detects gas leakage from a gas valve.
第４図は従来の二重遮断ガスバルブのリークチェック装
置を示すブロック回路図であり、図において、■はガス
漏れの検知対象としての上流側の第１の遮断弁（図中、
ｖｌと示す）、２は同じく下流側の第２の遮断弁（図中
、ｖ２と示す）、３はこれら遮断弁１．２が接続される
ガス管路、４は前記第１．第２の遮断弁１． ２間のガ
ス管路３における検知対象チャンバとへ連通するチエツ
クチャンバ５を、密閉されたハウジング６により形成す
るバルブリークチエッカ、しかしてこのバルブリークチ
エッカ４内には、チエツクチャンバ５の加圧時に開放さ
れる第３の遮断弁７、この第３の遮断弁７に直列に接続
された加圧手段としてのポンプ８、前記チエツクチャン
バ５内の圧力を検知する圧力検知スイッチ９、及び前記
第３の遮断弁７の開閉制御やポンプ８の運転制御を行う
と共に、チエツクチャンバ５内の圧力が設定圧力である
所定設定値以下に低下したとき、警報器（図示せず）に
警報信号を出力する、即ち、所定のプログラムシーケン
スに沿って前記第１．第２の遮断弁１，２のガス漏れの
検知作業の制御を行うコントローラ１０が設置されてい
る。なお、前記第１及び第２の遮断弁１，２はそれぞれ
、対応して１個づつ設けられているアクチュエータとし
ての電磁比例コイル（共に図示路）により駆動されて開
閉動作する。
次に動作について説明する。第１．第２の遮断弁１．２
を共に閉じ、次にバルブリークチエッカ４内の第３の遮
断弁７を開いてポンプ８を稼動させる。そしてチエツク
チャンバ５内の圧力を、第１の遮断弁１の１次側（入口
側）よりのガス供給により、該１次側の圧力より３００
〜４００ｍＡｑ程度高く加圧して第３の遮断弁７を閉じ
る。そしてチエツクチャンバ５内の圧力を圧力検知スイ
ッチ９により検知し、該圧力が前記第３の遮断弁７の閉
止後、所定時間のうちに前記所定設定値より低下するか
否かのチエツクをコントローラ１０の制御下に実行し、
しかしてもしも低下したならば、弁リーク異常と判断し
て、コントローラｌＯは警報信号を出力する。FIG. 4 is a block circuit diagram showing a conventional double shutoff gas valve leak check device. In the figure, ■ indicates the first upstream shutoff valve (in the figure,
2 is a second cut-off valve (shown as v2 in the figure) which is also on the downstream side, 3 is a gas pipe line to which these cut-off valves 1.2 are connected, and 4 is the first cut-off valve 1.2. Second shutoff valve1. A valve leak checker in which a check chamber 5 communicating with a chamber to be detected in a gas pipe line 3 between two valves is formed by a sealed housing 6; a third shutoff valve 7 that opens when pressure is applied; a pump 8 as pressurizing means connected in series to the third shutoff valve 7; a pressure detection switch 9 that detects the pressure inside the check chamber 5; It controls the opening and closing of the third shutoff valve 7 and the operation of the pump 8, and also sends an alarm signal to an alarm (not shown) when the pressure in the check chamber 5 drops below a predetermined set pressure. That is, the first . A controller 10 is installed to control gas leakage detection work of the second shutoff valves 1 and 2. The first and second cutoff valves 1 and 2 are opened and closed by being driven by electromagnetic proportional coils (both illustrated in the figure) as actuators provided one by one. Next, the operation will be explained. 1st. Second isolation valve 1.2
are closed together, and then the third shutoff valve 7 in the valve leak checker 4 is opened to operate the pump 8. Then, the pressure inside the check chamber 5 is increased by 300° from the pressure on the primary side by supplying gas from the primary side (inlet side) of the first shutoff valve 1.
The third shutoff valve 7 is closed by applying a high pressure of about 400 mAq. Then, the pressure inside the check chamber 5 is detected by the pressure detection switch 9, and the controller 10 checks whether the pressure falls below the predetermined set value within a predetermined time after the third shutoff valve 7 is closed. run under the control of
However, if it decreases, it is determined that there is a valve leak abnormality, and the controller IO outputs an alarm signal.
従来の二重遮断ガスバルブのリークチェック方法は以上
のように構成されているので、前記弁リーク異常の有無
を判断するには、加圧手段である前記ポンプ８により所
定加圧値まで検知対象チャンバであるチエツクチャンバ
５内の圧力を加圧設定後、前記所定時間の経過を待たな
ければならず、弁リーク異常のチエツクに多大の時間を
必要とする問題点があった。
この発明は上記問題点を解消するためになされたもので
、前記所定時間の経過を待つ必要もなく、極めて短時間
のうちに弁リーク異常のチエツクが行えるようにした二
重遮断ガスバルブのリークチェック方法を提供すること
を目的とする。Since the conventional double-blocking gas valve leak check method is configured as described above, in order to determine the presence or absence of the valve leakage abnormality, the pump 8, which is the pressurizing means, is used to pressurize the detection target chamber to a predetermined pressurization value. After setting the pressure in the check chamber 5, it is necessary to wait for the predetermined time period to elapse, resulting in a problem in that it takes a long time to check for abnormal valve leakage. This invention was made to solve the above problems, and it is possible to check for valve leak abnormalities in a very short time without having to wait for the elapse of the predetermined time. The purpose is to provide a method.
この発明に係る二重遮断ガスバルブのリークチェック方
法は、検知対象チャンバ内の圧力を所定加圧値に設定後
、該圧力を短時間のうちに２回検出し、この２回の検出
圧力と該２回の検出時刻との関係から、コントローラの
所定プログラムシーケンス内の所定の関係式に基づいて
、第１及び第２の遮断弁の弁リーク異常の有無を判断す
るようにしたものである。In the leak check method for a double shutoff gas valve according to the present invention, after setting the pressure inside the chamber to be detected to a predetermined pressure value, the pressure is detected twice within a short time, and the detected pressure and the Based on the relationship between the two detection times and a predetermined relational expression in a predetermined program sequence of the controller, it is determined whether there is a valve leak abnormality in the first and second shutoff valves.
この発明におけるコントローラは、検知対象チャンバ内
の圧力を所定加圧値に設定後において２回、該チャンバ
内の圧力を２回検出し、その２回の検出圧力とそのとき
の２回の検出時刻とから、所定の関係式に基づいて弁リ
ーク異常の有無を判断する。したがって弁リーク異常の
有無の判断が極めて短時間のうちに実行可能となる。The controller in this invention detects the pressure inside the chamber twice after setting the pressure inside the detection target chamber to a predetermined pressure value, and detects the two detected pressures and the two detection times at that time. Based on this, the presence or absence of a valve leak abnormality is determined based on a predetermined relational expression. Therefore, it becomes possible to determine the presence or absence of a valve leak abnormality in an extremely short time.
以下、この発明の実施例を図について説明する。
なお、第４図につき説明した従来装置と同一構成部につ
いては、重複説明は行わない。先ず、第１図により本発
明装置の概略構成を説明すると、図中、１１は本発明に
よるガスリークチェックチャンバユニットであり、その
詳細構造は第２図により後述する。また１２は温度セン
サであり、この温度センサ１２は、第１．第２の遮断弁
１．２間のガス管路３における検知対象チャンバ内の温
度を検知して、その温度変化による内圧変化に対し、温
度補償をコントローラ１０に行わせるために設けられて
いる。
次に第２図において、前記ガスリークチェックチャンバ
ユニット１１の詳細構成を説明する。図中、２１はこの
ユニット１１のハウジングであり、このハウジング２１
の内部は、第１のダイアフラム２２と第２のダイアフラ
ム２３とにより仕切られている。そしてこれら第１のダ
イアフラム２２と第２のダイアフラム２３とにより形成
される空間は加減圧チャンバ２４を構成し、しかしてこ
の加減圧チャンバ２４は、連結孔２５を介し、前記第１
の遮断弁１と第２の遮断弁２との間のガス管路３におけ
るガス漏れの前記検知対象チャンバに連通している。
２６は第１のダイアフラム２２に直接、そのプランジャ
２７を固着させた電磁比例コイルであり、該プランジャ
２７はコントローラ１０により電磁比例コイル２６が通
電されるとき、その駆動電流の大きさに応じて変位する
。即ち、このプランジャ２７を備えた電磁比例コイル２
６は、加減圧チャンバ２４内の圧力を変動させ、第１の
ダイアフラム２２の位置を変位させる加圧手段を構成す
る。
２８は第２のダイアフラム２３に常時当接しているレバ
ーアームで、その先端にはマグネット２９が取付けられ
ている。３０はこのマグネット２９に対向してハウジン
グ２１の外壁に取付けられた磁電変換素子より成る圧力
センサで、前記加減圧チャンバ２４内の圧力変動に応じ
て動作する第２のダイアフラム２３と共に移動するマグ
ネット２９の該移動に伴う磁束密度の変化を電気信号に
変換し、コントローラ１０に供給する。即ち、圧力セン
サ３０は圧力検出手段及び信号変換手段を構成するもの
である。３１はレバーアーム２８の回動力を調節するア
ジャストスクリュー、３２はブリード孔である。
次に動作について説明する。例えばガスバーナの燃焼運
転が停止したとき、あるいは燃焼停止状態にあるとき、
コントローラｌＯは所定のプログラムシーケンスに沿っ
て作動を開始する。しかして、ガス管路３を介してガス
を供給するには、第１及び第２の遮断弁１． ２に対し
個別に設けられているアクチュエータとしての電磁比例
コイル（図示時）を励磁し、該弁１，２を開くようにす
る。そののち、第１の遮断弁１を閉じ、次いで第２の遮
断弁２を閉じる。そして加圧手段である電磁比例コイル
２６をコントローラ１０はその制御指令により励磁して
所定加圧値、例えば第３図に示すコントローラ１０のプ
ログラムシーケンスの概念図のａ点の５００ｍＡｑまで
、検知対象チャンバ、即ち、加減圧チャンバ２４内を加
圧する。次いでそのａ点の５００ｍＡｑの所定加圧値へ
の加圧設定後、第３図に示す所定時間内における時刻ｔ
１．ｔ２で２回、前記加減°圧チャンバ２４内の圧力を
検出する。なお、この圧力検出は、圧力センサ３０から
の信号によりコントローラ１ｏは確認する。また前記所
定時間とは、第４図の従来装置につき説明した、前記所
定加圧値に加圧設定後に前記チャンバ内の圧力が所定設
定値（第３図の例では３５０ ｍｍＡｑ）以下に低下す
るが否がの判断を従来のコントローラ１０が検出判断し
ていた弁リーク異常有無のチエツク時間を指しており、
例えば従来では１０秒間であった。
一方、コントローラ１０のプログラムシーケンスには、
前記時刻ｔｌ、ｔ２における２回の検出圧力値ＰＩ、Ｐ
２とに対し、Δｔ＝ｔ２−ｔｌ。
ΔＰ＝Ｐ１−Ｐ２として、
リーク量＝
なる関係式（１１がプログラムされており、したがって
コントローラ１０はこの関係式（１）に、今回求めたｔ
ｌ、ｔ２．ＰＩ、Ｐ２がらリーク量を算出し、そのリー
ク量が弁リーク異常に相当するか否かの判断を行う、そ
して弁リーク異常であれば警報信号を出力する一方、弁
リーク異常なしでは、次のシーケンス実行に移る。
いま、関係式（１）に基づくリーク量算出の具体例を１
つ説明すると、
第１．第２の遮断弁１．２間の容積＝ ３０ ｃｃ、加
圧後の絶対圧＝ １０９００龍＾ｑ１検知リーク量＝３
０ｃｃ／ｈ
として通常規格の遮断バルブの場合を仮定すると、従来
の方法では、
となり、圧力降下を５０ｍａＡｑに設定して弁リーク異
常を判断しようとすると約１７秒のチエ７り（検出）時
間が必要であった。
一方、上述した状況をこの発明の方法で実行すると、前
記所定加圧値に加圧設定後の圧力検出時刻ｔ１．ｔ２を
それぞれ１秒後、２秒後とすると、（１）式から、
となり、
ＰＩ−Ｐ２≧３．０３・・・弁リーク異常ありＰｉ−Ｐ
２＜３．０３・・・弁リーク異常なしの判断を、前記所
定加圧値への加圧設定後、２秒間にて実行でき、チエツ
ク時間が大幅に短縮できる。Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the conventional device explained with reference to FIG. 4 will not be explained repeatedly. First, the schematic structure of the apparatus of the present invention will be explained with reference to FIG. 1. In the figure, reference numeral 11 is a gas leak check chamber unit according to the present invention, the detailed structure of which will be described later with reference to FIG. Further, 12 is a temperature sensor, and this temperature sensor 12 is connected to the first. It is provided to detect the temperature inside the detection target chamber in the gas pipe line 3 between the second shutoff valves 1.2 and to cause the controller 10 to perform temperature compensation for internal pressure changes due to the temperature changes. Next, referring to FIG. 2, the detailed configuration of the gas leak check chamber unit 11 will be explained. In the figure, 21 is a housing of this unit 11, and this housing 21
The inside of is partitioned by a first diaphragm 22 and a second diaphragm 23. The space formed by the first diaphragm 22 and the second diaphragm 23 constitutes a pressurization chamber 24, and this pressurization chamber 24 is connected to the first diaphragm 24 through the connecting hole 25.
The gas leak in the gas pipe line 3 between the shutoff valve 1 and the second shutoff valve 2 is communicated with the chamber to be detected. 26 is an electromagnetic proportional coil having a plunger 27 fixed directly to the first diaphragm 22, and when the electromagnetic proportional coil 26 is energized by the controller 10, the plunger 27 is displaced according to the magnitude of the drive current. do. That is, the electromagnetic proportional coil 2 equipped with this plunger 27
Reference numeral 6 constitutes a pressurizing means that changes the pressure within the pressurization chamber 24 and displaces the position of the first diaphragm 22. A lever arm 28 is in constant contact with the second diaphragm 23, and a magnet 29 is attached to its tip. Reference numeral 30 denotes a pressure sensor consisting of a magnetoelectric transducer mounted on the outer wall of the housing 21 facing the magnet 29, and the magnet 29 moves together with the second diaphragm 23 which operates in response to pressure fluctuations in the pressure reduction chamber 24. The change in magnetic flux density accompanying this movement is converted into an electrical signal and supplied to the controller 10. That is, the pressure sensor 30 constitutes pressure detection means and signal conversion means. 31 is an adjustment screw for adjusting the rotational force of the lever arm 28, and 32 is a bleed hole. Next, the operation will be explained. For example, when the combustion operation of a gas burner stops or when the combustion is stopped,
The controller IO begins operating according to a predetermined program sequence. Thus, in order to supply gas via the gas line 3, the first and second shutoff valves 1. An electromagnetic proportional coil (as shown) as an actuator provided individually for each valve 2 is excited to open the valves 1 and 2. Thereafter, the first shutoff valve 1 is closed, and then the second shutoff valve 2 is closed. Then, the controller 10 excites the electromagnetic proportional coil 26, which is the pressurizing means, in accordance with the control command, and applies pressure to the detection target chamber up to a predetermined pressurization value, for example, 500 mA at point a in the conceptual diagram of the program sequence of the controller 10 shown in FIG. That is, the inside of the pressurization/depressurization chamber 24 is pressurized. Next, after setting the pressure at point a to a predetermined pressure value of 500 mAq, at time t within the predetermined time shown in FIG.
1. The pressure inside the pressure regulating chamber 24 is detected twice at t2. Note that this pressure detection is confirmed by the controller 1o based on a signal from the pressure sensor 30. Further, the predetermined time period refers to the time when the pressure within the chamber decreases to a predetermined set value (350 mmAq in the example of FIG. 3) after the pressure is set to the predetermined pressure value, as explained in connection with the conventional device shown in FIG. The conventional controller 10 detects and determines whether or not there is a valve leakage abnormality.
For example, in the past, it was 10 seconds. On the other hand, the program sequence of the controller 10 includes:
The two detected pressure values PI and P at the times tl and t2
2, Δt=t2−tl. Assuming ΔP=P1-P2, leakage amount=The relational expression (11) is programmed, so the controller 10 uses this relational expression (1) to calculate the currently calculated t.
l, t2. The leak amount is calculated from PI and P2, and it is determined whether the leak amount corresponds to a valve leak abnormality. If the valve leak is abnormal, an alarm signal is output, but if there is no valve leak abnormality, the following Move on to sequence execution. Now, a specific example of leak amount calculation based on relational expression (1) is shown below.
To explain: 1. Volume between second shutoff valve 1.2 = 30 cc, absolute pressure after pressurization = 10900 yen Detected leak amount = 3
Assuming a normal standard shutoff valve with 0 cc/h, the conventional method would be as follows.If you set the pressure drop to 50 maAq and try to determine a valve leak abnormality, the detection time would be approximately 17 seconds. It was necessary. On the other hand, when the above-mentioned situation is carried out by the method of the present invention, the pressure detection time t1 after the pressurization is set to the predetermined pressurization value. If t2 is set to 1 second and 2 seconds, respectively, then from equation (1), PI-P2≧3.03... Valve leak abnormality exists Pi-P
2<3.03... It is possible to determine whether there is any valve leakage abnormality within 2 seconds after setting the pressure to the predetermined pressure value, and the check time can be significantly shortened.
以上のように、この発明によれば、二重遮断ガスバルブ
のリークチェック方法を、検知対象チャンバ内の圧力を
所定加圧値に設定後、該圧力を短時間のうちに２回検出
し、この２回の検出圧力と該２回の検出時刻との関係か
ら、コントローラの所定プログラムシーケンス内の所定
の関係式に基づいて、第１及び第２の遮断弁の弁リーク
異常の有無を判断するように構成したので、チエツク時
間が大幅に短縮され、極めて短時間のうちに弁リーク異
常の有無判断が実行できる効果がある。As described above, according to the present invention, a leak check method for a double shutoff gas valve is implemented by detecting the pressure twice within a short period of time after setting the pressure inside the detection target chamber to a predetermined pressure value. From the relationship between the two detected pressures and the two detection times, it is determined whether there is a valve leak abnormality in the first and second shutoff valves based on a predetermined relational expression in a predetermined program sequence of the controller. Because of this configuration, the check time is significantly shortened, and the presence or absence of valve leakage abnormality can be determined in an extremely short period of time.
第１図はこの発明に係る二重遮断ガスバルブのリークチ
ェック装置の概略構成図、第２図は特にガスリークチェ
ックチャンバユニット１１の詳細構造を示す断面図を含
む構成図、第３図はコントローラ１０に組込まれたプロ
グラムシーケンスの内容を示すグラフを表わす図、第４
図は従来装置の概略構成図である。
ｌは第１の遮断弁、２は第２の遮断弁、１０はコントロ
ーラ、２４は加減圧チャンバ（検知対象チャンバ）、２
６は電磁比例コイル（加圧手段）。
なお、図中、同一符号は同一または相当部分を示す。
特許出願人 山武ハネウェル株式会社
（外２名）
第３図
ヒー所走時間−Ｈ
手続補正書（自発）
平成 １．４．２５
昭和 年 月 日
持許庁長官殿
ｌＧ１″トの表示
特願昭
６３−３３２４３９号
発明の名称
二重遮断ガスパルプのリークチェック方法３、補正をす
る者
＋６６６３山武ハネウェル株式会社
６ 。
補正の内容
明細書筒
０頁第１２行に
とあるのを
以
上FIG. 1 is a schematic configuration diagram of a leak check device for a double shutoff gas valve according to the present invention, FIG. 2 is a configuration diagram including a sectional view showing the detailed structure of the gas leak check chamber unit 11, and FIG. Figure 4 representing a graph showing the contents of the incorporated program sequence;
The figure is a schematic configuration diagram of a conventional device. 1 is a first shutoff valve, 2 is a second shutoff valve, 10 is a controller, 24 is a pressurization chamber (chamber to be detected), 2
6 is an electromagnetic proportional coil (pressurizing means). In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Patent Applicant: Yamatake Honeywell Co., Ltd. (2 others) Figure 3 Heat Travel Time-H Procedural Amendment (Spontaneous) April 25, 1999 Showa (Monday/Monday) Director General of the Japan Patent Office No. 63-332439 Name of the invention Leak check method for double-barreled gas pulp 3 Person making the amendment + 6663 Yamatake Honeywell Co., Ltd. 6. Contents of the amendment The above statement is on page 0, line 12 of the specification.
Claims (1)
象チャンバ内を加圧手段により所定加圧値に加圧した状
態でその圧力が所定時間内に所定設定値より低下したと
きに、前記第１及び第２の遮断弁に弁リーク異常が発生
したと判断することを、コントローラの所定プログラム
シーケンスに沿って実行する二重遮断ガスバルブのリー
クチェック方法において、 前記検知対象チャンバ内の圧力を前記加圧手段により所
定加圧値に加圧設定したのちにおいて前記検知対象チャ
ンバ内の圧力を２回検出し、該２回の検出圧力値と該２
回の検出時刻とから所定の関係式に基づいて、前記コン
トローラが前記第１及び第２の遮断弁の弁リーク異常の
有無を判断するようにしたことを特徴とする二重遮断ガ
スバルブのリークチェック方法。[Scope of Claims] When the inside of the chamber to be detected for gas leakage between the first shutoff valve and the second shutoff valve is pressurized to a predetermined pressure value by the pressurizing means, the pressure is increased within a predetermined time. In a leak check method for a double cutoff gas valve, the method includes determining that a valve leak abnormality has occurred in the first and second cutoff valves when the value falls below a predetermined set value, in accordance with a predetermined program sequence of a controller. , after setting the pressure in the detection target chamber to a predetermined pressure value by the pressurizing means, detecting the pressure in the detection target chamber twice, and comparing the detected pressure values of the two times and the second pressure value.
Leak check of a double cutoff gas valve, characterized in that the controller determines whether or not there is a valve leak abnormality in the first and second cutoff valves based on a predetermined relational expression based on the detection time of the first and second cutoff valves. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33243988A JPH02179434A (en) | 1988-12-29 | 1988-12-29 | Checking method of leak in double cutoff gas valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33243988A JPH02179434A (en) | 1988-12-29 | 1988-12-29 | Checking method of leak in double cutoff gas valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02179434A true JPH02179434A (en) | 1990-07-12 |
Family
ID=18254989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33243988A Pending JPH02179434A (en) | 1988-12-29 | 1988-12-29 | Checking method of leak in double cutoff gas valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02179434A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518809A (en) * | 1991-07-12 | 1993-01-26 | Kubota Corp | Electronic rate balance apparatus |
| JPH0577900A (en) * | 1991-02-28 | 1993-03-30 | Niigata Eng Co Ltd | Testing method for leakage in emergency severance device for loading and unloading of fluid |
| JPH06302605A (en) * | 1993-04-14 | 1994-10-28 | Nec Corp | Semiconductor device |
| JP2006079981A (en) * | 2004-09-10 | 2006-03-23 | Toyota Motor Corp | Fuel cell system performing malfunction detection processing |
| JP2013245961A (en) * | 2012-05-23 | 2013-12-09 | Gastar Corp | Leakage inspection method and leakage inspection apparatus therefor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54140585A (en) * | 1978-04-24 | 1979-10-31 | Diesel Kiki Co | Fluid circuit leakage detector |
| JPS6365902A (en) * | 1986-09-05 | 1988-03-24 | Toshiba Corp | Device for controlling flow rate of fed liquid to centrifugal film dryer |
-
1988
- 1988-12-29 JP JP33243988A patent/JPH02179434A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54140585A (en) * | 1978-04-24 | 1979-10-31 | Diesel Kiki Co | Fluid circuit leakage detector |
| JPS6365902A (en) * | 1986-09-05 | 1988-03-24 | Toshiba Corp | Device for controlling flow rate of fed liquid to centrifugal film dryer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0577900A (en) * | 1991-02-28 | 1993-03-30 | Niigata Eng Co Ltd | Testing method for leakage in emergency severance device for loading and unloading of fluid |
| JPH0518809A (en) * | 1991-07-12 | 1993-01-26 | Kubota Corp | Electronic rate balance apparatus |
| JPH06302605A (en) * | 1993-04-14 | 1994-10-28 | Nec Corp | Semiconductor device |
| JP2006079981A (en) * | 2004-09-10 | 2006-03-23 | Toyota Motor Corp | Fuel cell system performing malfunction detection processing |
| JP4715138B2 (en) * | 2004-09-10 | 2011-07-06 | トヨタ自動車株式会社 | Fuel cell system for abnormality detection processing |
| JP2013245961A (en) * | 2012-05-23 | 2013-12-09 | Gastar Corp | Leakage inspection method and leakage inspection apparatus therefor |
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