JPS62271909A - Steam valve controller - Google Patents
Steam valve controllerInfo
- Publication number
- JPS62271909A JPS62271909A JP11555986A JP11555986A JPS62271909A JP S62271909 A JPS62271909 A JP S62271909A JP 11555986 A JP11555986 A JP 11555986A JP 11555986 A JP11555986 A JP 11555986A JP S62271909 A JPS62271909 A JP S62271909A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- valve
- steam valve
- steam
- deviation
- 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
- 238000001514 detection method Methods 0.000 claims description 26
- 230000005856 abnormality Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 206010029216 Nervousness Diseases 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Landscapes
- Control Of Turbines (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
〔発明の目的〕
（産業上の利用分野）
本発明は、火力や原子力発電プラント等の蒸気タービン
において用いられる蒸気弁のｌｌｉ制御装置に関する。Detailed Description of the Invention 3. Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to an LLI control device for a steam valve used in a steam turbine such as a thermal power plant or a nuclear power plant.
（従来の技術）
蒸気タービンには蒸気流迅を負荷に応じて制御するため
に悪気弁が設けられている。この蒸気弁は通常、複数弁
が並設され、３弁ないしは４弁がほぼ同じ開度で制御１
１１されることが多い。各弁４．Ｌ位４検出器によって
弁実聞度を検出され、これらの位置検出信号と、開度要
求信号どの信号差によって＄１ ｔｉｌｌされている。(Prior Art) A steam turbine is provided with a bad air valve to control steam flow rate according to load. This steam valve usually has multiple valves installed in parallel, and 3 or 4 valves are controlled at approximately the same opening.
11 is often given. Each valve4. The valve actual position is detected by four L position detectors, and $1 till is determined by the signal difference between these position detection signals and the opening request signal.
（発明が解決しようとする問題点）
位置検出器が、それ自体の異常や脱落等によって弁実聞
度を正常に反映しない場合には、聞１衰要求信号に対す
るフィードバック信号がバランスしないため、蒸気弁は
閉方向または閉方向に暴走し、正常な制御が不可能とな
る。このような場合には、タービン前圧の急変により、
プラン１〜が停止に至るという不都合が生じる。(Problem to be Solved by the Invention) If the position detector does not properly reflect the valve actuality due to its own abnormality or dropout, the feedback signal for the damping request signal will not be balanced, and the steam The valve runs out of control in the closing direction or in the closing direction, making normal control impossible. In such a case, due to a sudden change in the turbine front pressure,
An inconvenience arises in that plans 1 to 1 are stopped.
（問題点を解決するための手段）
本発明の蒸気弁制御ＩＤ装置は蒸気弁を駆動する変化率
演算器と、この変化率演算器を制御する１ナーボ弁と、
前記蒸気弁を駆動する変化率演算器に連結されて前記蒸
気弁の位置検出信号を出力する位置検出器と、この位置
検出器からの位置検出信号、開度要求信号、手動閉動作
信号Ｊ３よび手動間Ｏ】作信号を入力し、前記サーボ弁
に制御信号を出力する蒸気弁制御装置において、前記制
御装置には蒸気弁を低速で開閉させる偏差信号を発生Ｊ
る信号発生器と、微閉信号を発生する信号発生器と、微
開信号を発生する信号発生器と、開度要求信号、ｌ１３
よび位置検出信号を入力して偏差信号を出力する加ｔ３
器とが設けられていことを特徴とする。(Means for Solving the Problems) The steam valve control ID device of the present invention includes a rate-of-change calculator that drives a steam valve, a 1-nervo valve that controls the rate-of-change calculator,
a position detector connected to a rate-of-change calculator that drives the steam valve and outputs a position detection signal of the steam valve; a position detection signal from the position detector, an opening request signal, a manual closing operation signal J3, and a position detector that outputs a position detection signal of the steam valve; In a steam valve control device that inputs an operation signal and outputs a control signal to the servo valve, the control device generates a deviation signal that opens and closes the steam valve at a low speed.
a signal generator that generates a slight close signal, a signal generator that generates a slight open signal, an opening request signal, l13
t3 which inputs the position detection signal and outputs the deviation signal.
It is characterized by being equipped with a container.
（作用）
本発明においては、運転中の弁位置検出器のなんらかの
異常による弁開度制御不能うという事態を回避し、プラ
ントの停止という事態を可及的に回避することができる
。(Function) In the present invention, it is possible to avoid a situation where the valve opening cannot be controlled due to some abnormality of the valve position detector during operation, and to avoid a situation where the plant is stopped as much as possible.
（実施例） 以下、図面を参照して本発明の詳細な説明する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図は本発明による蒸気弁制御５Ａ清の一実施例を示
すもので、蒸気タービン（図示せず）への蒸気流量を制
御するために蒸気弁１が設けられている。この蒸気弁は
油圧シリンダ２によって開閉駆動される。油圧シリンダ
２は制ｍ＋装置３からの信号４によって制御されるサー
ボ弁５の開閉動作によって駆動される。また蒸気弁１の
開度は油圧シリンダ２に取付けられた位置検出器６−に
よって検出され、位置検出信号７ａとして制御装置３に
送られる
なお、上記蒸気弁１、油圧シリンダ２、号−ボ弁５、位
置検出器６は３台ずつ並ｉ没されており、制御装置３に
は位置検出信号７ａと共に、同時開開動作を行う他の蒸
気弁（図示せず）の開度を示す位置検出信号７ｂ、７ｃ
も同様に入力し、また手動閉動作信号９および手動開動
作信号１０も入力しサーボ弁５へ制御信号４を送る。FIG. 1 shows an embodiment of a steam valve control 5A according to the present invention, in which a steam valve 1 is provided to control the flow rate of steam to a steam turbine (not shown). This steam valve is driven to open and close by a hydraulic cylinder 2. The hydraulic cylinder 2 is driven by the opening/closing operation of a servo valve 5 controlled by a signal 4 from a control m+ device 3. Further, the opening degree of the steam valve 1 is detected by a position detector 6- attached to the hydraulic cylinder 2, and is sent to the control device 3 as a position detection signal 7a. 5. Three position detectors 6 are installed in parallel, and the control device 3 receives a position detection signal 7a as well as a position detection signal indicating the opening degree of other steam valves (not shown) that open and open simultaneously. Signals 7b, 7c
is similarly inputted, and a manual closing operation signal 9 and a manual opening operation signal 10 are also inputted, and a control signal 4 is sent to the servo valve 5.
第２図は制御装置３の詳細構造を示すものである。弁の
開度要求信号８と当該弁の位置検出信号７ａは加粋器１
１で比較演算され、偏差４’ａ号１２が出力される。こ
の偏差信号は接点１３．１４を通して増幅器１５に導か
れ、そこで増幅されて位置検出器５への制御信４４とな
る。FIG. 2 shows the detailed structure of the control device 3. The valve opening request signal 8 and the valve position detection signal 7a are sent to the pump 1.
1 is compared and the deviation 4'a No. 12 is output. This deviation signal is conducted through contacts 13, 14 to an amplifier 15, where it is amplified and becomes a control signal 44 to the position detector 5.
使方、中間ｌ１Ｉｉ選択器１６は位置検出信号７ａ。How to use: The intermediate l1Ii selector 16 receives the position detection signal 7a.
７ｂ、７ｃを入力して比較し、その中間信４３１７を出
力りる。すなわら、例えば７ｂ＜７ａ＜７ｃの条件が入
力された場合には、出力信号は７ａとなる。この中間信
号１７は加棹器１８で比較演粋され、ぞの偏差信号１９
が出力される。信号発生器２０は偏差信号１９を入力し
て信号２１を発する。この信号２１はタイマー２２を介
して接点１３．２３に伝達され、これらを制御する。7b and 7c are input and compared, and the intermediate signal 4317 is output. That is, for example, if the condition 7b<7a<7c is input, the output signal will be 7a. This intermediate signal 17 is compared and extracted by a processor 18, and a deviation signal 19 is obtained.
is output. A signal generator 20 receives the deviation signal 19 and generates a signal 21. This signal 21 is transmitted via a timer 22 to the contacts 13, 23 to control them.
一方、手動開動作信号１０は接点２３を介して１４を制
御する。また手動閉動作信号９は接点２４を制御する。On the other hand, the manual opening operation signal 10 controls 14 via the contact 23. The manual closing operation signal 9 also controls the contact 24 .
信号発生器２５は蒸気弁１を微小開閉動作させる信号２
６を発生する。この信号は接点２４゜１３、’１４およ
び増幅器１５を介してり°−ボ弁５への制御信号４とな
る。The signal generator 25 generates a signal 2 that causes the steam valve 1 to open and close minutely.
Generates 6. This signal becomes the control signal 4 to the valve 5 via the contacts 24° 13, '14 and the amplifier 15.
信号発生器２７は蒸気弁１を低速で閉める信号２８を発
生し、この信号は接点２４．１３．１４および増幅器１
５を介してサーボ弁５への制御信＠４となる。また、信
号発生器２つは蒸気弁１を低速で聞【Ｊる信号３０を発
生する。この信５１３０は接点１４、増幅器１５を介し
てり一−ボ弁５への制御信！？ｊ４となる。The signal generator 27 generates a signal 28 that closes the steam valve 1 at low speed, which signal is connected to the contacts 24.13.14 and the amplifier 1.
The control signal @4 is sent to the servo valve 5 via the servo valve 5. The two signal generators also generate a signal 30 that listens to the steam valve 1 at a low speed. This signal 5130 is a control signal to the valve 5 via the contact 14 and the amplifier 15! ? It becomes j4.
次ぎに、上ｊホのように構成した本発明装置のり１作を
説明する。Next, one example of the apparatus of the present invention constructed as shown above will be explained.
蒸気タービンの通常運転ｔｒ、’Ｈに【１３台の蒸気弁
１はほぼ同じ開度にあるため、位置検出信号７ａ。During normal operation of the steam turbine tr, 'H, [13 steam valves 1 are at approximately the same opening degree, so the position detection signal 7a is detected.
７ｂ、７ｃの中間信号１７と位置検出信号７ａとの偏差
信号１９は微小である。この時、信号発生器２０は接点
１３を信号１２側に保持し、かつ、接点２３を開にする
信号を発している。この場合（ま安定状態にあるため、
タイマー２２の影費は受けない。また、この時、蒸気弁
１は開度要求信号８によって制御されており、開度要求
信号８と、弁位置検出信号７ａとが加棹器１１で比較演
算されているが、両信号８と７ａはほぼバランスしてお
り、偏差信号１２は非常に小さな値となっている。The deviation signal 19 between the intermediate signal 17 of signals 7b and 7c and the position detection signal 7a is very small. At this time, the signal generator 20 holds the contact 13 on the signal 12 side and emits a signal that opens the contact 23. In this case (because it is in a stable state,
Timer 22's shadow expenses will not be accepted. Further, at this time, the steam valve 1 is controlled by the opening request signal 8, and the opening request signal 8 and the valve position detection signal 7a are compared and calculated by the processor 11. 7a is almost balanced, and the deviation signal 12 has a very small value.
この偏差信号１２は接点１３．１４を経て増幅器１５に
入ノＪし、そこで増幅された後、（ナーボ弁５へ制御信
号４として出力されるざるが、偏差信号１２が微小であ
るからサーボ弁５は蒸気弁１を一定開度に保つよう制御
する。This deviation signal 12 enters the amplifier 15 via the contacts 13 and 14, and after being amplified there, it is output as the control signal 4 to the servo valve 5, but since the deviation signal 12 is minute, the servo valve 5 controls the steam valve 1 to maintain a constant opening.
なお、蒸気タービンが過渡状態にある時、各蒸気弁の０
１きは機械差により多少バラツクごとがあり、その場合
には位置検出信号７ａ、７ｂ、７ｃにもバラツキを生ず
るが、この時には、中間信号１７と位置検出信号７ａの
偏差信号１９が大きくなり、規定値を一時的に越えるこ
とがある。この場合、信号発生器２０からの信号も変化
するが、タイマー２２によって偏差信号１９が所定の時
間以上、規定値を越える状態が続かない限り、接点１３
．２３は切換わらない。この様な過渡状態ｔユ正常な・
ｂのであるため、この動作は妥当である。In addition, when the steam turbine is in a transient state, the 0 of each steam valve
1, there are some variations due to mechanical differences, and in that case, variations occur in the position detection signals 7a, 7b, and 7c, but at this time, the deviation signal 19 between the intermediate signal 17 and the position detection signal 7a becomes large, The specified value may be temporarily exceeded. In this case, the signal from the signal generator 20 also changes, but unless the deviation signal 19 continues to exceed the specified value for a predetermined period of time by the timer 22, the contact 13
．． 23 is not switched. Such a transient state is normal.
b, this operation is reasonable.
次に位置検出器６が脱落や、故ＶＪ等によって誤った位
置検出信号７ａを発生させた場合には、開度要求信号８
に対して位置検出信号７ａはバランスせず偏差値＠１２
は＋または−の大きな偏差値となる。これによって、蒸
気弁１は弁開り向、または弁ｍ方向にノンコントロール
の状態で動き出すことになる。Next, if the position detector 6 has fallen off or generated an incorrect position detection signal 7a due to a dead VJ, etc., the opening request signal 8
On the other hand, the position detection signal 7a is not balanced and has a deviation value of @12.
is a large deviation value of + or -. As a result, the steam valve 1 begins to move in the valve opening direction or in the valve m direction in an uncontrolled manner.
この時、位置検出信号７ｂ、７ｃは正常４工ため、中間
信号１７は前の状態とほとんど変らず、一定であるが、
位置検出信号７ａが大きく火なる。このため、偏差信号
１つは大きな値を示し、規定値をこえると、信号発生器
２０は接点１３を信号２６側に切換え、かつ接点２３を
閉とづる信号２１を発生する。At this time, the position detection signals 7b and 7c are normal, so the intermediate signal 17 is almost unchanged from the previous state and is constant.
The position detection signal 7a becomes louder. Therefore, one deviation signal exhibits a large value, and when it exceeds a specified value, the signal generator 20 switches the contact 13 to the signal 26 side and generates a signal 21 that closes the contact 23.
このとき、位置検出器６の故障が軽微で瞬時に復帰すれ
ば、タイマー２２の動きで接点１３゜２３は切換わらな
いが、所定時間以上、復帰しない場合には接点１３．２
３は切換えられる。この接点１３．２３の切換えにより
信号発生器２５の信号２６が接点２４，１３．１４、増
幅器１５を介してサーボ弁５におくられる。信号発生器
２５の特性ｔよ第３図に承り”通りであり、サーボ弁５
に対して、微開信号と微閉信号を交互に短時間ずつ繰り
返し入力する。従って、蒸気弁１はほぼ一定の開度に抑
制される。At this time, if the failure of the position detector 6 is minor and it recovers instantly, the contact 13.
3 can be switched. By switching the contact 13.23, a signal 26 from the signal generator 25 is sent to the servo valve 5 via the contacts 24, 13.14 and the amplifier 15. The characteristic t of the signal generator 25 is as shown in FIG. 3, and the servo valve 5
, a slight open signal and a slight close signal are alternately and repeatedly input for short periods of time. Therefore, the opening degree of the steam valve 1 is suppressed to a substantially constant degree.
故障が軽微であって短時間に復帰するような場合は、位
置検出器６が正常に復帰すると、偏差信号１つも小とな
り、信号発生器２０の動きによって接点１３は、信号１
２側に切換えられ、全て正常状態に復帰する。If the failure is minor and will recover in a short time, when the position detector 6 returns to normal, the deviation signal 1 will also become small, and the contact 13 will change to the signal 1 due to the movement of the signal generator 20.
Switched to side 2 and everything returned to normal state.
故障が生じて位置検出器６の交換等が必要な場合には、
蒸気弁１を一時全開させる必要がある。If a failure occurs and the position detector 6 needs to be replaced,
It is necessary to temporarily fully open the steam valve 1.
この場合には、外部より手動閉動作信号９を入力づる。In this case, the manual closing operation signal 9 is inputted from the outside.
この信号９により接点２４は信号２６側から信号２８側
へ切換えられる。このため、信号発生器２７の信号２８
が接点２４，１３．１４を経て増幅器１５で増幅され、
信号４となってサーボ弁５に送られる。信号発生器２７
の１１性−五節４図に示１通りであり、サーボ弁５に対
して微閉信号を送る。This signal 9 switches the contact 24 from the signal 26 side to the signal 28 side. Therefore, the signal 28 of the signal generator 27
is amplified by the amplifier 15 through the contacts 24, 13.14,
The signal becomes signal 4 and is sent to servo valve 5. Signal generator 27
This is as shown in Figure 11, Section 5, and sends a slight closing signal to the servo valve 5.
従って、蒸気弁１は、片前圧力に大きな変動を与えない
ように極めて低速度で閉じる。このようにして蒸気弁が
全開したら、位置検出器６等の変換やその他の点検処置
を行い、正常に復帰したことを確認した後、手動開動作
信号１０を入力する。Therefore, the steam valve 1 closes at an extremely low speed so as not to cause large fluctuations in the front pressure. When the steam valve is fully opened in this way, the position detector 6 etc. are converted and other inspection measures are performed, and after confirming that it has returned to normal, the manual opening operation signal 10 is input.
この信号は接点２３を経由して接点１４に入力し、接点
１４を信Ｑ３０側に切換える。その結果、信号発生器２
９の信号３０が接点１４を経て増幅器１５に入り、ここ
で増幅され、信号４となってり°−ボ弁５に送られる。This signal is input to the contact 14 via the contact 23, and the contact 14 is switched to the signal Q30 side. As a result, signal generator 2
9 enters the amplifier 15 via the contact 14, where it is amplified and becomes the signal 4, which is sent to the °-bo valve 5.
信８発生器２９の特性は第５図に示す通りであり、會ナ
ーボ弁５に対して微開信号を送る。The characteristics of the signal generator 29 are as shown in FIG. 5, and sends a slight opening signal to the nervo valve 5.
そのため、蒸気弁１は片前圧力に大きな変動を与えない
にうに極めて低速度′Ｃ−開く。この間弁動作中に中間
信号１７と、その弁の位置検出信号７ａとの偏差信号１
９が規定値以下になると、信号発生器２０は接点１３を
正常信号１２側に切換え、かつ接点２３をＯＦＦにする
信号２１をタイマ−２２を介して送る。この信号２１に
よつＣ接点１３は切替わり、また接点２３がＯＦＦとな
るため接点１４も信号１２側に切換えられる。この動作
によって制御系は正常状態に復帰する。゛なお、第２図
に示した実施例では、信号発生器２０は同時に関する３
弁の位置検出信号７ａ。Therefore, the steam valve 1 opens at an extremely low speed so as not to cause large fluctuations in the front pressure. During this time, the deviation signal 1 between the intermediate signal 17 and the valve position detection signal 7a during the valve operation.
9 becomes less than the specified value, the signal generator 20 switches the contact 13 to the normal signal 12 side and sends a signal 21 via the timer 22 to turn off the contact 23. The C contact 13 is switched by this signal 21, and since the contact 23 is turned off, the contact 14 is also switched to the signal 12 side. This operation returns the control system to its normal state. Note that in the embodiment shown in FIG.
Valve position detection signal 7a.
７ｂ、７ｃの中間信号１７とその弁の位置検出信号７ａ
との偏差信号１９を信号発生器２０に入力する例につき
述べたが、本発明はこれに限定されるみのではなく、第
６図に示すように、単にその弁の開度要求信号８と位置
検出信号７ａとの偏差信号３１を信号発生器２０の入力
信号とするようにしてもよい。7b, 7c intermediate signal 17 and the valve position detection signal 7a
Although an example has been described in which the deviation signal 19 between the valve and the position is inputted to the signal generator 20, the present invention is not limited to this, and as shown in FIG. The deviation signal 31 from the detection signal 7a may be used as an input signal to the signal generator 20.
上述のように、本発明によれば、位置検出器に異常を生
じたとしてら、抑制不能な状態とはならず、まずその開
度を保持し、しかる後に必要に応じて全開、補修するこ
とによって運転を継続することができる。As described above, according to the present invention, even if an abnormality occurs in the position detector, it does not go into an uncontrollable state, but first maintains its opening, and then fully opens and repairs as necessary. You can continue driving.
第１図は本発明の蒸気弁制御Ｓ！ｉ置の実施例をネサ系
統図、第２図は本発明における制御装置の実施例を示す
接続図、第３図ないし第５図は本発明装置における信号
発生器２５，２７．２９の作動を示す特性図、第６図は
本発明における制御１？ｆの他の実施例を示す接続図で
ある。
１・・・蒸気弁、２・・・油圧シリンダ、３・・・制御
装置、４・・・制御信号、５・・・号−ボ弁、６・・・
位置検出器、７・・・手動開動作信号、８・・・開度要
求信号、９・・・手動閉動作信号、１０・・・手動開動
作信号、１１゜１８・・・加痺器、１２．１９．３１・
・・偏差信号、１５・・・増幅器、１６・・・中間値選
択器、１７・・・中間信号、２０．２５．２７．２９・
・・信号発生器、２２・・・タイマー。
出願人代理人 佐 藤 −組
節１図
第２目
層間
第３目
間開
第４図
閉間Figure 1 shows the steam valve control S! of the present invention! FIG. 2 is a connection diagram showing an embodiment of the control device in the present invention, and FIGS. 3 to 5 show the operation of the signal generators 25, 27, and 29 in the device of the present invention. The characteristic diagram shown in FIG. 6 is control 1 in the present invention? FIG. 3 is a connection diagram showing another example of f. DESCRIPTION OF SYMBOLS 1... Steam valve, 2... Hydraulic cylinder, 3... Control device, 4... Control signal, 5... No.-bo valve, 6...
Position detector, 7...Manual opening operation signal, 8...Opening request signal, 9...Manual closing operation signal, 10...Manual opening operation signal, 11°18...Nursing device, 12.19.31・
... Deviation signal, 15... Amplifier, 16... Intermediate value selector, 17... Intermediate signal, 20.25.27.29.
...Signal generator, 22...Timer. Applicant's Representative Sato - Section 1, Figure 2, Layer 3, Open Figure 4, Closing
Claims (1)
制御するサーボ弁と、前記蒸気弁を駆動する変化率演算
器に連結されて前記蒸気弁の位置検出信号を出力する位
置検出器と、この位置検出器からの位置検出信号、開度
要求信号、手動閉動作信号および手動開動作信号を入力
し、前記サーボ弁に制御信号を出力する蒸気弁制御装置
において、前記制御装置には蒸気弁を低速で開閉させる
偏差信号を発生する信号発生器と、微閉信号を発生する
信号発生器と、微開信号を発生する信号発生器と、開度
要求信号および位置検出信号を入力して偏差信号を出力
する加算器とが設けられていことを特徴とする蒸気弁制
御装置。A rate-of-change calculator that drives the steam valve, a servo valve that controls the rate-of-change calculator, and a position detector that is connected to the rate-of-change calculator that drives the steam valve and outputs a position detection signal for the steam valve. In the steam valve control device that inputs a position detection signal, an opening request signal, a manual close operation signal, and a manual open operation signal from the position detector and outputs a control signal to the servo valve, the control device includes: A signal generator that generates a deviation signal that opens and closes the steam valve at low speed, a signal generator that generates a slight close signal, a signal generator that generates a slight open signal, an opening request signal, and a position detection signal are input. 1. A steam valve control device comprising: an adder for outputting a deviation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11555986A JPH07103810B2 (en) | 1986-05-20 | 1986-05-20 | Steam valve controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11555986A JPH07103810B2 (en) | 1986-05-20 | 1986-05-20 | Steam valve controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62271909A true JPS62271909A (en) | 1987-11-26 |
| JPH07103810B2 JPH07103810B2 (en) | 1995-11-08 |
Family
ID=14665536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11555986A Expired - Lifetime JPH07103810B2 (en) | 1986-05-20 | 1986-05-20 | Steam valve controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07103810B2 (en) |
-
1986
- 1986-05-20 JP JP11555986A patent/JPH07103810B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07103810B2 (en) | 1995-11-08 |
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