JP2557391Y2 - Valve open / close monitoring device - Google Patents
Valve open / close monitoring deviceInfo
- Publication number
- JP2557391Y2 JP2557391Y2 JP1993056008U JP5600893U JP2557391Y2 JP 2557391 Y2 JP2557391 Y2 JP 2557391Y2 JP 1993056008 U JP1993056008 U JP 1993056008U JP 5600893 U JP5600893 U JP 5600893U JP 2557391 Y2 JP2557391 Y2 JP 2557391Y2
- Authority
- JP
- Japan
- Prior art keywords
- opening
- torque
- closing
- valve
- time
- 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.)
- Expired - Fee Related
Links
Landscapes
- Indication Of The Valve Opening Or Closing Status (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、上下水道・河川の水管
・水路の弁・ゲート又はガス管の弁を遠隔で開閉し、併
せて開閉状態を監視する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for remotely opening and closing a water pipe, a water pipe of a river, a valve of a water channel, a gate or a valve of a gas pipe, and also monitors the open / closed state.
【０００２】[0002]
【従来の技術】従来、作業員が定期的又は不定期的に水
管・水路・ガス管のバルブ・ゲートのある現地に行き、
開閉操作して開閉時の最大トルクを第４図の如くバネ計
り等でもって測定し、その最大トルク値を記帳しその最
大トルク値とその経歴によってバルブの異常をチェック
していた。又、弁開閉装置にメカニカルなトルク検出機
構を設ける技術が特開昭５９−２１７０８２号公報に開
示されている。更に、電動弁が全閉，全開になったこと
を表示する機能を有する開閉表示装置が特開昭５６−１
５６５７４号公報に開示されている。2. Description of the Related Art Conventionally, a worker regularly or irregularly goes to a site where a water pipe, a waterway, a gas pipe, a valve and a gate are provided.
As shown in FIG. 4, the maximum torque at the time of opening and closing was measured by a spring meter and the like, and the maximum torque value was recorded, and the abnormality of the valve was checked based on the maximum torque value and its history. Further, a technique of providing a mechanical torque detecting mechanism in a valve opening / closing device is disclosed in Japanese Patent Application Laid-Open No. Sho 59-217082. Further, an open / close display device having a function of displaying that the motor-operated valve has been fully closed and fully opened has been disclosed in Japanese Patent Application Laid-Open No. Sho 56-1.
No. 56574.
【０００３】[0003]
【考案が解決しようとする課題】従来のバルブ開閉の監
視方法では、作業員が現地まで行ってバルブ操作し、そ
の上記帳せねばならないため、手間・時間のかかるもの
となっていた。又、特開昭５９−２１７０８２号公報の
弁開閉装置は、単にメカニカルにトルクを検出し、異常
トルクのときモータを停止するだけのものであり、その
ときのトルク値・開閉度との時系列変化の記録・保存が
行えるものでない。従って、異常トルクの原因、異常ト
ルクの発生状況、弁の摩耗・損耗状態、弁開閉機構の損
傷等に関する情報が少なく、弁開閉装置の故障・異常・
交換時期・耐久性の検出・予知・推定が行えるものでな
かった。特開昭５６−１５６５７４号公報に開示の電動
弁は、全閉・全開となったことを表示する表示部を有す
るのみで、開閉操作時のトルク値の時系列変化及び最大
トルク値を記録することができず、前記公報同様に、弁
開閉装置の故障・異常・交換時期・耐久性等のための情
報がなく、これらの状態・予知・推定が充分に行えるも
のでなかった。更に、特開昭５９−２１７０８２号公報
には、トルク検出機構が開示され、実開昭６４−２０５
８１号公報には電磁弁の非励磁・励磁の記録する技術が
開示されているが、トルク値が設定値を超えると警報す
るシステム及び開閉時のトルク値と操作時とを関連づけ
てトルク記録するものでないため、バルブの状態の検査
・予測が正確に行えず、又バルブ異常の感知が遅れると
いう問題点がある。本考案の課題は、従来のかかる問題
点を解消し、バルブがある現地に行くことなく遠隔地で
バルブの開閉の状態の検査と監視が行えるとともに、弁
の作動状態・損耗、開閉装置の作動状態・損傷・耐久性
・交換時期・異常の検出・分析・予知・推定が行え、弁
開閉情報を与えることができるという優れたバルブ開閉
監視装置を提供することにある。In the conventional method of monitoring the opening and closing of a valve, the operator has to go to the site to operate the valve and write down the above information, which is troublesome and time-consuming. Further, the valve opening / closing device disclosed in JP-A-59-217082 merely detects the torque mechanically and stops the motor when the torque is abnormal, and the time series of the torque value and the opening / closing degree at that time is used. Changes cannot be recorded and stored. Therefore, there is little information on the cause of the abnormal torque, the state of occurrence of the abnormal torque, the worn or worn state of the valve, and the damage of the valve opening / closing mechanism.
It was not possible to detect, predict, or estimate the timing of replacement and durability. The motor-operated valve disclosed in Japanese Patent Application Laid-Open No. 56-156574 has only a display unit for indicating that the valve has been fully closed and fully opened, and records the time-series change of the torque value and the maximum torque value during the opening / closing operation. As in the above publication, there is no information on the failure, abnormality, replacement time, durability, etc. of the valve opening / closing device, and the state, prediction, and estimation thereof cannot be sufficiently performed. Furthermore, JP-A-59-217082
Discloses a torque detection mechanism.
No. 81 discloses a technique for recording non-excitation / excitation of a solenoid valve.
Although it is disclosed, an alarm is issued when the torque value exceeds the set value.
System and the torque value at the time of opening and closing
Inspection of valve condition because torque is not recorded
・ Prediction cannot be performed accurately, and the detection of valve abnormality is delayed.
There is a problem. The object of the present invention is to solve the conventional problems and to inspect and monitor the opening / closing state of the valve at a remote place without going to the site where the valve is located, to operate and wear the valve, and to operate the opening / closing device. An object of the present invention is to provide an excellent valve opening / closing monitoring device capable of detecting, analyzing, predicting, and estimating state, damage, durability, replacement time, and abnormality, and providing valve opening / closing information.
【０００４】[0004]
【課題を解決するための手段】かかる課題を解決した本
考案の要旨は、 １） バルブ開閉駆動装置にバルブの開度を計るバルブ
開度計と開閉トルク検出器とを設けるとともに、遠隔地
にバルブ開閉駆動装置の開閉操作部と，開閉トルク検出
器のトルク表示器と，バルブ開度計の開度表示器と，開
閉時のトルク値と操作時とを関連して記録するトルク記
録装置とを設けるとともに、開閉トルク検出器のトルク
値が設定値を超えると遠隔地において音又は光で警報す
る警報回路を備え、前記トルク記録装置が記録するトル
ク値が開閉時の最大トルク値であるバルブ開閉監視装置 ２） バルブ開閉駆動装置にバルブの開度を計るバルブ
開度計と開閉トルク検出器とを設けるとともに、遠隔地
にバルブ開閉駆動装置の開閉操作部と，開閉トルク検出
器のトルク表示器と，バルブ開度計の開度表示器と，開
閉時のトルク値と操作時とを関連して記録するトルク記
録装置とを設けるとともに、開閉トルク検出器のトルク
値が設定値を超えると遠隔地において音又は光で警報す
る警報回路を備え、前記トルク記録装置は開閉時の開度
とトルク値との時系列変化を記録するバルブ開閉監視装
置 ３） バルブ開閉駆動装置にバルブの開度を計るバルブ
開度計と開閉トルク検出器とを設けるとともに、遠隔地
にバルブ開閉駆動装置の開閉操作部と，開閉トルク検出
器のトルク表示器と，バルブ開度計の開度表示器と，開
閉時のトルク値と操作時とを関連して記録するトルク記
録装置とを設けるとともに、開閉トルク検出器のトルク
値が設定値を超えると遠隔地において音又は光で警報す
る警報回路を備え、前記トルク記録装置は開閉時の最大
トルク値と操作時の開度に応じたトルク値の時系列変化
を記録したバルブ開閉監視装置にある。The gist of the present invention to solve the above problems is as follows. 1) A valve opening / closing drive device is provided with a valve opening meter for measuring the opening of a valve and an opening / closing torque detector, and is provided at a remote place. An opening / closing operation section of a valve opening / closing drive device, a torque indicator of an opening / closing torque detector, an opening indicator of a valve position gauge, and a torque recording device for recording a torque value at the time of opening and closing and an operation time. And the torque of the open / close torque detector.
If the value exceeds the set value, a sound or light alarm will be issued at a remote location.
A valve opening / closing monitoring device , wherein the torque value recorded by the torque recording device is a maximum torque value at the time of opening / closing; 2) a valve opening meter and an opening / closing torque detector for measuring a valve opening degree in a valve opening / closing drive device; In addition to the above, the opening / closing operation section of the valve opening / closing drive device, the torque indicator of the opening / closing torque detector, the opening indicator of the valve position gauge, and the torque value at opening / closing and the operation at the remote location are related. And a torque recording device that records the torque of the open / close torque detector.
If the value exceeds the set value, a sound or light alarm will be issued at a remote location.
That includes an alarm circuit, the torque recording apparatus off the valve opening meter for measuring the opening of the valve to the valve opening and closing the monitoring device 3) valve opening and closing drive device for recording the time series change of the opening and the torque value at the time of opening and closing In addition to providing a torque detector, an opening / closing operation unit of a valve opening / closing drive device, a torque indicator of an opening / closing torque detector, an opening indicator of a valve position meter, a torque value at opening / closing, and a And a torque recording device that records the torque of the opening / closing torque detector.
If the value exceeds the set value, a sound or light alarm will be issued at a remote location.
The torque recording device is a valve opening / closing monitoring device that records a maximum torque value at the time of opening and closing and a time series change of a torque value according to the opening at the time of operation.
【０００５】[0005]
【作用】本考案でバルブ検査を行うには、バルブから離
れた位置にある開閉操作部を操作してバルブ開閉駆動装
置を作動させる。バルブ開閉時のバルブの開度はバルブ
開度計で計測され、又その時のトルクは開閉トルク検出
器によって測定され、その信号は遠隔地に設けたトルク
表示器、開度表示器及びトルク記録装置に送られる。ト
ルク表示器及び開度表示器によって各開度におけるトル
ク値が目視できるように表示する。又この開度とトルク
値はトルク記録装置によって記録される。特に開閉時の
最大トルク値はバルブの機能を示す値として重要であ
り、記録されるとともに、注意・異常状態を示す設定ト
ルク値と比較され、異常又注意値を超えればその旨音又
は光で警報させることもできる。又トルク記録装置にお
いて最大トルク値とその開閉操作時（検査時の年月日）
の経時変化を記憶させたり、又開閉時の開度とトルク値
の時系列変化も記録すればバルブの状態の分析に役立つ
ものとなる。In order to perform the valve inspection according to the present invention, the valve opening / closing drive device is operated by operating the opening / closing operation unit at a position away from the valve. The opening of the valve at the time of opening and closing the valve is measured by a valve opening meter, and the torque at that time is measured by an opening and closing torque detector, and the signal is transmitted from a torque indicator, opening indicator and torque recording device provided at a remote place. Sent to The torque value at each opening is displayed so as to be visually observed by the torque indicator and the opening indicator. The opening and the torque value are recorded by a torque recording device. In particular, the maximum torque value at the time of opening and closing is important as a value indicating the function of the valve, and is recorded and compared with the set torque value indicating caution / abnormal condition. You can also make an alarm. In addition, the maximum torque value and its opening / closing operation in the torque recording device (date of inspection)
If the time-dependent changes of the valve are stored, and the time-series changes of the opening degree and the torque value at the time of opening and closing are recorded, it becomes useful for analyzing the state of the valve.
【０００６】[0006]
【実施例】以下、実施例を図面に基づいて説明する。図
面に示す実施例のトルク記録装置は、最大トルク値の計
測とその経歴変化記録開度とトルクとの経時変化、トル
ク値と異常設定トルク値、注意設定トルク値との比較検
出と検出時の警報を行えるものとしている。図中１はバ
ルブ、２はバルブ開閉駆動装置、３はバルブ開度計、４
は開閉トルク検出器である。バルブ開閉駆動装置２はモ
ータ５、ギヤ６、ウォーム７、同ウォームに噛合するウ
ォームギヤ８、バルブ駆動軸９、皿バネ１０、手動ハン
ドル１１、リミットスイッチ１２からなっている。又２
０は遠隔操作室、２１は開閉操作部、２２はトルク表示
計、２３はバルブ開度計、２４はトルク記録装置、２５
は異常警報ランプ、２６は注意警報ランプである。トル
ク記録装置２４は、開度トルク時系列記録回路３０、比
較回路３１、異常トルク設定回路３２、注意トルク設定
回路３３、警報回路３４、最大トルク値計測回路３５、
最大トルク記録回路３６、年月日時刻発生回路３７、Ｃ
ＲＴディスプレイ制御回路３８、ＣＲＴ３９からなって
いる。Embodiments will be described below with reference to the drawings. The torque recording device of the embodiment shown in the drawing measures the maximum torque value and its history change, the chronological change of the recording opening and the torque, the comparison of the torque value with the abnormal set torque value, the caution set torque value, and the detection and detection. An alarm can be issued. In the figure, 1 is a valve, 2 is a valve opening / closing drive, 3 is a valve opening meter, 4
Is an opening / closing torque detector. The valve opening / closing drive device 2 includes a motor 5, a gear 6, a worm 7, a worm gear 8 meshing with the worm, a valve drive shaft 9, a disc spring 10, a manual handle 11, and a limit switch 12. 2
0 is a remote control room, 21 is an opening and closing operation unit, 22 is a torque indicator, 23 is a valve opening meter, 24 is a torque recording device, 25
Is an abnormality alarm lamp, and 26 is a caution alarm lamp. The torque recording device 24 includes an opening torque time series recording circuit 30, a comparison circuit 31, an abnormal torque setting circuit 32, a caution torque setting circuit 33, an alarm circuit 34, a maximum torque value measurement circuit 35,
Maximum torque recording circuit 36, date and time generation circuit 37, C
An RT display control circuit 38 and a CRT 39 are provided.
【０００７】この実施例では、遠隔操作室２０の開閉操
作部２１の操作スイッチを開すればモータ５が作動し、
ギヤ６、ウォーム７、ウォームギヤ８を経てバルブ駆動
軸９が回転してバルブ１が開閉される。バルブ１のトル
クは開閉トルク検出器４で測定され、又開度はギヤ６か
ら回転を読み込んで開度を計測するバルブ開度計３によ
って測定され、その情報はいずれも有線で遠隔操作室２
０まで送られる。開度及びトルク値は直ちにトルク表示
計２２，バルブ開度計２３によって表示される。又それ
らの値はトルク記録装置２４に入力される。まずバルブ
開度とトルク値とは秒単位で開度トルク時系列記録回路
３０に入力され、時間とともに記録され、又ＣＲＴ３９
に前回の結果と併せて表示できるようにしている。その
ＣＲＴ画面を第３図に示す。又トルク値は比較回路３１
に入力され、異常トルク設定回路３２の異常トルク設定
値及び注意トルク設定回路３３の注意トルク設定値と比
較され、これらの設定値を超えると警報回路３４を作動
させ、異常警報ランプ２５・注意警報ランプ２６を点滅
させて知らせるものである。又トルク値の最大値を最大
トルク値計測回路３５によって算出し、その開閉におけ
る最大トルク値をその操作年月日と併せて最大トルク記
録回路３６に記録保存し、必要に応じて又は開閉時にＣ
ＲＴ３９に第２図のように画面表示し、バルブの状態の
検討又は予測についての情報を与える。In this embodiment, when the operation switch of the opening / closing operation section 21 of the remote control room 20 is opened, the motor 5 operates,
The valve drive shaft 9 rotates through the gear 6, the worm 7, and the worm gear 8, and the valve 1 is opened and closed. The torque of the valve 1 is measured by an opening / closing torque detector 4, and the opening is measured by a valve opening meter 3 which reads the rotation from a gear 6 and measures the opening.
Sent to 0. The opening and the torque value are immediately displayed by the torque indicator 22 and the valve opening meter 23. These values are input to the torque recording device 24. First, the valve opening and the torque value are input to the opening torque time series recording circuit 30 in seconds, and are recorded with time.
To be displayed together with the previous result. The CRT screen is shown in FIG. Also, the torque value is calculated by the comparison circuit 31.
Is compared with the abnormal torque set value of the abnormal torque setting circuit 32 and the caution torque set value of the caution torque setting circuit 33. When the set values are exceeded, the alarm circuit 34 is activated, and the abnormal alarm lamp 25 and the caution alarm The notification is made by blinking the lamp 26. Further, the maximum value of the torque value is calculated by the maximum torque value measurement circuit 35, and the maximum torque value at the time of opening and closing is recorded and stored in the maximum torque recording circuit 36 together with the operation date and time.
The screen is displayed on the RT 39 as shown in FIG. 2 to give information on the examination or prediction of the state of the valve.
【０００８】[0008]
【考案の効果】以上の様に本考案によれば、バルブのあ
る現地に行って開閉トルクを測る必要がなく、遠隔地に
て開閉トルクを測定でき、開度とともに記録できるの
で、バルブ監視・検査作業が大巾に軽減される。又最大
トルク値・開度トルクの時系列変化も記録保存できるの
で、バルブの状態の検査・予測を正確に行えるという効
果がある。[Effects of the Invention] As described above, according to the present invention, there is no need to go to the site where the valve is located and measure the opening / closing torque, and the opening / closing torque can be measured at a remote location and recorded together with the opening degree. Inspection work is greatly reduced. Further, since the time-series changes of the maximum torque value and the opening torque can be recorded and stored, there is an effect that the inspection and prediction of the state of the valve can be accurately performed.
【図１】実施例を示す説明図である。FIG. 1 is an explanatory diagram showing an embodiment.
【図２】最大トルク値の時系列変化を示す説明図であ
る。FIG. 2 is an explanatory diagram showing a time-series change of a maximum torque value.
【図３】トルク値と開度の変化を示す説明図である。FIG. 3 is an explanatory diagram showing changes in a torque value and an opening.
【図４】従来のバルブのトルク測定方法を示す説明図で
ある。FIG. 4 is an explanatory diagram showing a conventional method for measuring torque of a valve.
１ バルブ ２ バルブ開閉駆動装置 ３ バルブ開度計 ４ 開閉トルク検出器 ５ モータ ６ ギヤ ７ ウォーム ８ ウォームギヤ ９ バルブ駆動軸 ２０ 遠隔操作室 ２１ 開閉操作部 ２２ トルク表示計 ２３ バルブ開度計 ２４ トルク記録装置 ２５ 異常警報ランプ ２６ 注意警報ランプ ３０ 開度トルク時系列記録回路 ３１ 比較回路 ３２ 異常トルク設定回路 ３３ 注意トルク設定回路 ３４ 警報回路 ３５ 最大トルク値計測回路 ３６ 最大トルク記録回路 ３９ ＣＲＴ REFERENCE SIGNS LIST 1 valve 2 valve opening / closing driving device 3 valve opening meter 4 opening / closing torque detector 5 motor 6 gear 7 worm 8 worm gear 9 valve driving shaft 20 remote control room 21 opening / closing operation section 22 torque display meter 23 valve opening meter 24 torque recording device 25 Abnormal alarm lamp 26 Caution alarm lamp 30 Opening torque time series recording circuit 31 Comparison circuit 32 Abnormal torque setting circuit 33 Caution torque setting circuit 34 Alarm circuit 35 Maximum torque value measurement circuit 36 Maximum torque recording circuit 39 CRT
Claims (3)
るバルブ開度計と開閉トルク検出器とを設けるととも
に、遠隔地にバルブ開閉駆動装置の開閉操作部と，開閉
トルク検出器のトルク表示器と，バルブ開度計の開度表
示器と，開閉時のトルク値と操作時とを関連して記録す
るトルク記録装置とを設けるとともに、開閉トルク検出
器のトルク値が設定値を超えると遠隔地において音又は
光で警報する警報回路を備え、前記トルク記録装置が記
録するトルク値が開閉時の最大トルク値であるバルブ開
閉監視装置。1. A valve opening / closing drive device comprising a valve opening meter for measuring the opening of a valve and an opening / closing torque detector, and an opening / closing operation section of the valve opening / closing drive device and a torque display of the opening / closing torque detector at a remote place. And an opening indicator of a valve opening meter, and a torque recording device for recording the torque value at the time of opening and closing and the operation time, and detecting the opening and closing torque.
If the torque value of the vessel exceeds the set value,
A valve opening / closing monitoring device comprising an alarm circuit for giving an alarm by light, wherein a torque value recorded by the torque recording device is a maximum torque value at opening / closing.
るバルブ開度計と開閉トルク検出器とを設けるととも
に、遠隔地にバルブ開閉駆動装置の開閉操作部と，開閉
トルク検出器のトルク表示器と，バルブ開度計の開度表
示器と，開閉時のトルク値と操作時とを関連して記録す
るトルク記録装置とを設けるとともに、開閉トルク検出
器のトルク値が設定値を超えると遠隔地において音又は
光で警報する警報回路を備え、前記トルク記録装置は開
閉時の開度とトルク値との時系列変化を記録するバルブ
開閉監視装置。2. A valve opening / closing drive device comprising a valve opening meter for measuring the opening of a valve and an opening / closing torque detector, and an opening / closing operation section of the valve opening / closing drive device and a torque display of the opening / closing torque detector at a remote place. And an opening indicator of a valve opening meter, and a torque recording device for recording the torque value at the time of opening and closing and the operation time, and detecting the opening and closing torque.
If the torque value of the vessel exceeds the set value,
A valve opening / closing monitoring device including an alarm circuit for giving an alarm by light, wherein the torque recording device records a time-series change in an opening degree and a torque value at the time of opening / closing.
るバルブ開度計と開閉トルク検出器とを設けるととも
に、遠隔地にバルブ開閉駆動装置の開閉操作部と，開閉
トルク検出器のトルク表示器と，バルブ開度計の開度表
示器と，開閉時のトルク値と操作時とを関連して記録す
るトルク記録装置とを設けるとともに、開閉トルク検出
器のトルク値が設定値を超えると遠隔地において音又は
光で警報する警報回路を備え、前記トルク記録装置は開
閉時の最大トルク値と操作時の開度に応じたトルク値の
時系列変化を記録したバルブ開閉監視装置。3. A valve opening / closing drive device comprising a valve opening meter for measuring the opening of a valve and an opening / closing torque detector, and an opening / closing operation section of the valve opening / closing drive device and a torque display of the opening / closing torque detector at a remote place. And an opening indicator of a valve opening meter, and a torque recording device for recording the torque value at the time of opening and closing and the operation time, and detecting the opening and closing torque.
If the torque value of the vessel exceeds the set value,
A valve opening / closing monitoring device comprising an alarm circuit for giving an alarm by light, wherein the torque recording device records a time series change of a torque value according to a maximum torque value at the time of opening and closing and an opening at the time of operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993056008U JP2557391Y2 (en) | 1993-09-22 | 1993-09-22 | Valve open / close monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993056008U JP2557391Y2 (en) | 1993-09-22 | 1993-09-22 | Valve open / close monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0625686U JPH0625686U (en) | 1994-04-08 |
| JP2557391Y2 true JP2557391Y2 (en) | 1997-12-10 |
Family
ID=13015030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993056008U Expired - Fee Related JP2557391Y2 (en) | 1993-09-22 | 1993-09-22 | Valve open / close monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2557391Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5230981B2 (en) * | 2007-09-06 | 2013-07-10 | 日本原子力発電株式会社 | Operational performance prediction method of electric gate valve in plant |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217082A (en) * | 1983-05-19 | 1984-12-07 | Nippon Gear Kogyo Kk | Torque detection mechanism for valve open/close device |
| JPS61189379A (en) * | 1985-02-18 | 1986-08-23 | Mitsubishi Heavy Ind Ltd | Performance test of hydraulic control device |
| JPS6420581U (en) * | 1987-07-27 | 1989-02-01 |
-
1993
- 1993-09-22 JP JP1993056008U patent/JP2557391Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0625686U (en) | 1994-04-08 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |