JPS62198727A - Detecting method for leak of hydraulic pressure - Google Patents
Detecting method for leak of hydraulic pressureInfo
- Publication number
- JPS62198727A JPS62198727A JP3931886A JP3931886A JPS62198727A JP S62198727 A JPS62198727 A JP S62198727A JP 3931886 A JP3931886 A JP 3931886A JP 3931886 A JP3931886 A JP 3931886A JP S62198727 A JPS62198727 A JP S62198727A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- valve
- leak
- tube
- hydraulic
- 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 5
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
(産業上の利用分野)
本発明は油圧漏洩検出方法に係り、特に液圧で駆動する
電力用の遮断器の操作機構に多く用いられるバルブや弁
類の漏洩検出の改良に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method for detecting hydraulic leakage, and in particular to valves and valves often used in the operation mechanism of power circuit breakers driven by hydraulic pressure. Related to improvements in leak detection of types.
(従来の技術) 電力用の遮断器は負荷電流の遮断のみならず。(Conventional technology) Power circuit breakers are used not only to interrupt load current.
電力系統の非常装置の役目もあり、動作指令に対し、不
動作又は異常動作は絶対許されない。It also serves as an emergency device for the power system, and non-operation or abnormal operation is absolutely not allowed in response to operation commands.
従って遮断器の操作機構には高速大出力という本来の機
能に加えてパイロット弁の同時励磁防止機能、ポンピン
グ防止機能など個々に詳細を述べないが、種々の機能を
そなえて、その動作を確実化している。Therefore, in addition to the original function of high speed and high output, the operating mechanism of the circuit breaker is equipped with various functions such as a function to prevent simultaneous excitation of the pilot valve and a function to prevent pumping, although I will not go into details individually, to ensure its operation. ing.
油圧操作形電力用の遮断器は系統中の地絡事故などを検
出すると、その指令をうけて、極めて高速で遮断操作を
行い事故の拡大防止を計るように企図されている。この
一連の動作のもとになるエネルギーはアキュムレータに
蓄えられた油圧力で。Hydraulically operated power circuit breakers are designed to detect a ground fault or similar accident in a power system, and upon receiving the command, shut the circuit off at extremely high speed in order to prevent the accident from escalating. The energy behind this series of operations is the hydraulic pressure stored in the accumulator.
種々のバルブを予め設定された順序に開閉して接点開閉
のピストンが駆動される。A piston for opening and closing contacts is driven by opening and closing various valves in a preset order.
そこでもし、弁類の封止機能いわゆるシールが悪いと、
圧力の保持ができないので、一連の動作が成立しなかっ
たり不十分となって、遮断器本来の機能が発揮できない
ことになる。従ってバルブのシール性は油圧操作機構の
最も基本的な機能の一つであることは論をまたない。So, if the sealing function of the valve is bad,
Since the pressure cannot be maintained, the series of operations may not be completed or may be insufficient, and the circuit breaker will not be able to perform its original function. Therefore, it goes without saying that valve sealing performance is one of the most basic functions of a hydraulic operating mechanism.
従来弁のシール性のヂエツクは実組立に先立ち、所定の
圧力よりも高い圧力を長時間かけるなど相当厳重に行れ
ている。Conventionally, the sealing performance of valves has been checked in a very strict manner by applying pressure higher than the specified pressure for a long period of time prior to actual assembly.
(発明が解決しようとする問題点)
しかし、油圧操作機構の動作圧力は数百気圧と高く、又
この状態での漏洩が徐々に発生するような場合には、長
時間の放置が必要であるなど、安全性の上からも検査能
率の上からも改善が望まれていた。(Problem to be solved by the invention) However, the operating pressure of the hydraulic operating mechanism is high, several hundred atmospheres, and if leakage gradually occurs under this condition, it is necessary to leave it for a long time. Improvements were desired from both safety and testing efficiency points of view.
本発明は上記の点を考慮してなされたもので、その目的
とするところは、安全にして、能率的に油圧操作機構の
弁類の漏洩を検出する油圧漏洩検出方法を提供すること
にある。The present invention has been made in consideration of the above points, and its purpose is to provide a hydraulic leakage detection method that safely and efficiently detects leakage of valves of a hydraulic operating mechanism. .
(問題点を解決するための手段)
弁の一方の開口部から低圧ガスを入れ、前記弁の弁体が
閉塞する部分を経由して他方の開口部から漏洩ガスをチ
ューブを介して捕集液中に導入し。(Means for solving the problem) Low-pressure gas is introduced from one opening of the valve, and the leaked gas is passed through the other opening through the part of the valve where the valve body is closed, and then sent to the collection liquid through a tube. Introduce it inside.
このチューブから放出される漏洩ガスの気泡のパルス童
を計測して、漏洩ガス量を検出することによって、能率
的に油圧操作機構の弁類の漏洩を検出することを特徴と
する。The present invention is characterized in that leakage of valves of the hydraulic operating mechanism is efficiently detected by measuring the pulse rate of bubbles of leaking gas released from the tube and detecting the amount of leaking gas.
(実施例)
以下本発明の油圧漏洩検出方法の一実施例を第1図ない
し第5図を参照して説明する。第1図において、弁1は
弁シート2内に収納される弁体1aによって、弁シート
2に形成される一方の開口部。(Embodiment) An embodiment of the hydraulic leakage detection method of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, a valve 1 is one opening formed in a valve seat 2 by a valve body 1a housed within the valve seat 2.
すなわち第1の開口部2aを閉塞し、弁体1aが収納さ
れる弁シート2内の空間と弁シート2外部とを連通ずる
他方の開口部、すなわち第2の開口部2bを形成する。That is, the first opening 2a is closed, and the other opening, that is, the second opening 2b, which communicates the space inside the valve seat 2 in which the valve body 1a is accommodated with the outside of the valve seat 2 is formed.
そして、弁体1aの一方端は第1の開口部2aを閉塞す
るように図示されない油圧操作機構の一部に相当する固
定部4に固着される圧縮ばね3の他方端によって押圧さ
れるように圧縮ばね3が設けられる。One end of the valve body 1a is pressed by the other end of a compression spring 3 fixed to a fixed part 4 corresponding to a part of a hydraulic operation mechanism (not shown) so as to close the first opening 2a. A compression spring 3 is provided.
本発明の一実施例の構成は、例えば乾燥空気ボンベ5か
らレギュレータ6を介して配管7で接続し、この配管6
には圧力計7aが設けられる。また配管7はス1−ツブ
バルブ8を介して弁1の第1の開口部2aに接続される
。また弁1の第2の開口部2bに接続したチューブ10
を容器12内に満した捕集液体11中に導く。 このチ
ューブ10の先端10aはガス捕集容器13内に導かれ
、捕集液体11中のガス捕集ができる。 ガス捕集容器
13の上部の蓋13aの外側には例えば振動加速度ピッ
クアップのような気泡音を検出する検出器15が取付け
られる。この検出器15は信号線1Gによって図示しな
い計測表示装置に導かれる。The configuration of one embodiment of the present invention is such that, for example, a dry air cylinder 5 is connected to a pipe 7 via a regulator 6.
is provided with a pressure gauge 7a. The pipe 7 is also connected to the first opening 2a of the valve 1 via a tube valve 8. Also, a tube 10 connected to the second opening 2b of the valve 1
into the collection liquid 11 filled in the container 12. The tip 10a of this tube 10 is guided into the gas collection container 13, and gas in the collection liquid 11 can be collected. A detector 15 for detecting bubble sound, such as a vibration acceleration pickup, is attached to the outside of the upper lid 13a of the gas collection container 13. This detector 15 is led to a measurement display device (not shown) by a signal line 1G.
また第2図に示すように、ガス捕集器13の上部の11
3aの外側に取付けられた検出器15は信号線16によ
って測定表示装置23に埠続される。この測定表示装置
23には増幅器17.フィルタ18.表示器19が収納
され、気泡14のパルス音を計測するようになっている
。In addition, as shown in FIG.
A detector 15 mounted on the outside of 3a is connected to a measurement display 23 by a signal line 16. This measurement display device 23 includes an amplifier 17. Filter 18. A display 19 is housed and is adapted to measure the pulse sound of the bubbles 14.
この測定表示装置23の表示器19の出力データ20は
第3図に示すように気泡のパルス音をパルス記@21の
ように表示する。As shown in FIG. 3, the output data 20 of the display 19 of the measurement display device 23 displays the pulse sound of bubbles as shown in pulse note @21.
次に本発明の一実施例の方法について説明する。Next, a method according to an embodiment of the present invention will be described.
油圧の代りに例えば乾燥空気ボンベ5から弁1の第1の
開口部2aに所定の低圧の圧力を加えると、弁体1aに
よって閉塞された第1の開口部2aから弁シート2内に
空気が漏洩し、この空気は第2の開口部2bから矢印9
のようにチューブ10を通り、ガス捕集容器13内のチ
ューブIOの先端部10aから気泡14のようにしてガ
ス捕集容器13の上部に溜る。このような気泡14のパ
ルス音を記録することにより、後述するようにガス漏洩
を油漏洩におきかえて、油漏洩の有無を検出することが
できる。When a predetermined low pressure is applied to the first opening 2a of the valve 1 from, for example, a dry air cylinder 5 instead of oil pressure, air flows into the valve seat 2 from the first opening 2a blocked by the valve body 1a. This air leaks from the second opening 2b as indicated by the arrow 9.
The gas passes through the tube 10 as shown in FIG. By recording such pulse sounds of the bubbles 14, it is possible to replace gas leakage with oil leakage and detect the presence or absence of oil leakage, as will be described later.
このようなガス漏洩の検出について再び説明する。捕集
液体11の中のチューブ10の先端10aから放出され
る気泡14は、浮力と表面張力のつり合った大きさでチ
ューブ10から放たれ上昇する。気泡1箇あたりの空気
容積は水面高さを一定とすれば相当正確に一定である。Detection of such gas leakage will be explained again. The bubbles 14 released from the tip 10a of the tube 10 in the collection liquid 11 are released from the tube 10 and rise with a size that balances buoyancy and surface tension. The air volume per bubble is fairly accurately constant if the water surface height is constant.
又、この気泡発生時の微小な音を調べると、チューブ1
0の先端10aから気泡が離れるときにパルス状の音を
発することがわかった。また、このパルスの周波数成分
はガス捕集容器13の固有振動数や水面までの気柱高さ
などが関係する成分が大きいので、これらをフィルタ1
8で分離し、積分表示すると前記第3図に示すパルス記
録21のようなパルス列が得られ、これをもとにすなわ
ち、パルス数によって漏洩ガス量を電気的に検出するこ
とができる。Also, when examining the minute sound when bubbles are generated, tube 1
It has been found that when the bubble leaves the tip 10a of the 0, a pulse-like sound is emitted. In addition, since the frequency components of this pulse have large components related to the natural frequency of the gas collection container 13 and the height of the air column to the water surface, these are filtered by the filter 1.
When separated by 8 and integrally displayed, a pulse train like the pulse record 21 shown in FIG.
さらに油圧漏洩検出をする代りにガス圧を利用した等優
性について述べる。第3図は縦軸にガス漏洩量(cc/
5ee)をとり、横軸にガス圧力をとり、ある2箇の弁
A、Bを本発明の方法でガス圧力を変えてガス漏洩量を
試験した例を示す。Furthermore, we will discuss equidominance that uses gas pressure instead of detecting hydraulic leakage. In Figure 3, the vertical axis shows the amount of gas leakage (cc/
5ee), the horizontal axis shows the gas pressure, and an example is shown in which the gas leakage amount of two certain valves A and B was tested by changing the gas pressure using the method of the present invention.
このときガス圧力は1〜4 kglal程度、検出した
ガス漏洩量は0.1〜数cc/secの程度である。又
この弁A、Bを夫々従来の油圧漏洩検出方法で試験した
ところ、規定の油圧力で弁Aは漏洩なし、弁Bは数cc
/seeの漏洩を生じていた。At this time, the gas pressure is about 1 to 4 kglal, and the detected gas leakage amount is about 0.1 to several cc/sec. Also, when these valves A and B were tested using the conventional hydraulic leakage detection method, valve A did not leak at the specified hydraulic pressure, while valve B did not leak several cc.
/see was leaking.
同様な実験を多数行い、理論的裏付けのもとに整理する
と規定油圧力で油が漏洩する弁と、閉塞が良好な弁に対
しほぼ第5図に示すような関係を示す。A number of similar experiments have been conducted, and when summarized based on theoretical support, the relationship between a valve that leaks oil at a specified hydraulic pressure and a valve that is well closed is approximately as shown in FIG. 5.
第5図は縦軸にガス漏洩量(cc/5ec)をとり、横
軸にガス圧力をとると、規定油圧力で油漏洩するものと
、しないものとはほぼ第5図に示す直線で示すような境
界線mによって区分されていることがわかった。 そこ
で、ガス圧力をガス圧力P11に固定し、 このときの
ガス漏洩量Qsをもって規定油圧における油漏洩の有無
を判定できることがわかった。In Figure 5, the vertical axis represents the amount of gas leakage (cc/5ec), and the horizontal axis represents the gas pressure.The straight line shown in Figure 5 shows whether oil leaks at the specified oil pressure or not. It was found that the area is divided by a boundary line m like this. Therefore, it has been found that it is possible to fix the gas pressure at the gas pressure P11 and determine the presence or absence of oil leakage at the specified oil pressure based on the gas leakage amount Qs at this time.
すなわち境界線mをはさんで縦軸側は規定油圧力で油漏
洩があり、また横軸側は規定油圧力で油漏洩がないと区
分できることがわかった。このようにガス漏洩が油漏洩
よりも感度が高いのは気体と液体の分子の大きさが極端
に異るためである。In other words, it was found that on the vertical axis side across the boundary line m, there was oil leakage at the specified hydraulic pressure, and on the horizontal axis side, there was no oil leakage at the specified hydraulic pressure. The reason why gas leaks are more sensitive than oil leaks is because the molecular sizes of gas and liquid are extremely different.
このように油圧の代りにガスすなわち気体圧を使ってガ
ス漏洩検査により、従来の油圧より短時間、かつ速かに
弁の閉塞程度を検出する油圧漏洩検出方法を提供するこ
とができる。In this way, it is possible to provide a hydraulic leakage detection method that detects the degree of valve occlusion in a shorter time and more quickly than conventional hydraulic pressure by using gas, that is, gas pressure, instead of hydraulic pressure.
次に本発明の他の実施例を第6図を参照して説明する。Next, another embodiment of the present invention will be described with reference to FIG.
第1図と同一部分は同符号を付しである。The same parts as in FIG. 1 are given the same reference numerals.
前述の第1図においては1系統の例について説明したが
、第6図に示すように多数、図示では4系統数列に設置
することにより、多数の弁1を同時に漏洩検出すること
ができる。In the above-mentioned FIG. 1, an example of one system was explained, but as shown in FIG. 6, leakage can be detected from a large number of valves 1 at the same time by installing the valves in a number of systems, four systems as shown in the figure.
さらに説明すると、弁1の図示しない第1の開口部側か
ら所定のガス圧力をセットした後、電磁弁25をタイマ
ー26により一定時間開放して第1の開口部側にガス圧
力を加える。このとき図示しない弁1の第2の開口部側
に接続されるチューブ10を通してガス捕集容器13に
捕集されたガス漏洩量27aを設定された目盛27によ
り判定することによって、すなわち、タイマー26によ
って設定された所定時間内に漏洩したガス漏洩量27a
が目盛27に達するか、あるいは超えるか、否かによっ
て、すなわち、弁1のガス漏洩量27aが目盛27に達
するかあるいは超えれば不良、目盛24に達しないもの
は良と判定することができる。To explain further, after setting a predetermined gas pressure from the first opening side (not shown) of the valve 1, the solenoid valve 25 is opened for a certain period of time by the timer 26 to apply gas pressure to the first opening side. At this time, the amount of gas leakage 27a collected in the gas collection container 13 through the tube 10 connected to the second opening side of the valve 1 (not shown) is determined by the set scale 27, that is, the timer 26 Gas leakage amount 27a that leaked within the predetermined time set by
Depending on whether the amount of gas leakage 27a of the valve 1 reaches or exceeds the scale 27, it can be determined to be defective, and if it does not reach the scale 24, it can be determined to be good.
以上説明したように本発明によれば、弁の油圧系の漏洩
を感度の良いガス漏洩で代用して低圧力の気体で実施し
、しかも電気的に単位時間当りの漏洩ガス量を検出する
ことにより、安全にして、かつ能率的に油圧操作機構の
弁の漏洩を検出ができる油圧漏洩検出方法を提供できる
。また検出に油を用いないため、検査した弁の検査後の
洗浄などの処理が不要となる利点が得られる。As explained above, according to the present invention, a leak in the hydraulic system of a valve is replaced with a sensitive gas leak, low-pressure gas is used, and the amount of leak gas per unit time is detected electrically. Accordingly, it is possible to provide a hydraulic leakage detection method that can safely and efficiently detect leakage from a valve of a hydraulic operating mechanism. Furthermore, since oil is not used for detection, there is an advantage that processing such as cleaning of the inspected valve after inspection is not necessary.
第1図は本発明の一実施例の断面図、第2図は本発明の
信号検出表示装置の回路図、第3図は第2図のパルス検
出データの線図、第4図は弁のガス圧力による漏洩測定
結果を示す線図、第5図はガス漏洩と油漏洩との関係の
実験結果を示す線図、第6図は本発明の他の実施例を示
す斜視図である。
10・・・チューブ 11・・・捕集液体12・
・・容器 13・・・ガス捕集容器14・・
・気泡 15・・・検出器16・・・信号線
23・・・測定表示装置25・・・電磁弁
2ト・・タイマー27・・・設定された目盛
27a・・・ガス漏洩量力゛スルカ
第4図FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a circuit diagram of a signal detection and display device of the present invention, FIG. 3 is a diagram of pulse detection data in FIG. 2, and FIG. 4 is a diagram of a valve. FIG. 5 is a diagram showing the results of leakage measurement based on gas pressure, FIG. 5 is a diagram showing the experimental results of the relationship between gas leakage and oil leakage, and FIG. 6 is a perspective view showing another embodiment of the present invention. 10...Tube 11...Collection liquid 12.
... Container 13... Gas collection container 14...
・Air bubbles 15...Detector 16...Signal line 23...Measurement display device 25...Solenoid valve
2t...Timer 27...Set scale
27a...Gas leakage force Figure 4
Claims (2)
、弁の一方の開口部から低圧ガスを入れ、前記弁の弁体
の閉塞部分を経由して他の開口部側よりの漏洩ガスをチ
ューブを介して捕集液中に導入し、このチューブの先端
をガス捕集容器中に入れ、前記チューブの先端から出る
漏洩ガスの気泡のパルス音を計測して漏洩ガス量を検出
するようにしたことを特徴とする油圧漏洩検出方法。(1) In a method for detecting hydraulic leakage from valves in a hydraulic operating mechanism, low-pressure gas is introduced from one opening of the valve, and leaked gas is detected from the other opening via the closed part of the valve body of the valve. The amount of leaked gas is detected by introducing the gas into the collection liquid through a tube, placing the tip of this tube into a gas collection container, and measuring the pulse sound of leaked gas bubbles coming out from the tip of the tube. A hydraulic leakage detection method characterized by:
パルス音数あるいは気泡を集めた漏洩ガス量が設定値に
達するかどうかにより、弁の良否を判定する特許請求の
範囲第1項記載の油圧漏洩検出方法。(2) The quality of the valve is determined based on whether the number of pulses of bubbles released from the tube into the gas collection container or the amount of leaked gas containing bubbles reaches a set value. Hydraulic leak detection method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3931886A JPS62198727A (en) | 1986-02-26 | 1986-02-26 | Detecting method for leak of hydraulic pressure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3931886A JPS62198727A (en) | 1986-02-26 | 1986-02-26 | Detecting method for leak of hydraulic pressure |
Publications (1)
Publication Number | Publication Date |
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JPS62198727A true JPS62198727A (en) | 1987-09-02 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP3931886A Pending JPS62198727A (en) | 1986-02-26 | 1986-02-26 | Detecting method for leak of hydraulic pressure |
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JP (1) | JPS62198727A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6731184B1 (en) | 1999-07-29 | 2004-05-04 | Murata Manufacturing Co., Ltd. | High frequency switching component |
JP2007218859A (en) * | 2006-02-20 | 2007-08-30 | Mitsubishi Rayon Co Ltd | Flaw inspection device of porous hollow yarn film |
JP2015509587A (en) * | 2012-02-22 | 2015-03-30 | イーオーピー マリーネ ア−・エスIop Marine A/S | Method for testing a gas shut-off valve and system for carrying out this method |
CN110411673A (en) * | 2019-08-16 | 2019-11-05 | 烟台中宇航空液压有限公司 | A kind of hydraulic part air seal test platform |
WO2023120621A1 (en) * | 2021-12-24 | 2023-06-29 | 株式会社キッツ | Valve seat inspection method and valve seat inspection device using image recognition camera |
-
1986
- 1986-02-26 JP JP3931886A patent/JPS62198727A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6731184B1 (en) | 1999-07-29 | 2004-05-04 | Murata Manufacturing Co., Ltd. | High frequency switching component |
US7183875B2 (en) | 1999-07-29 | 2007-02-27 | Murata Manufacturing Co., Ltd. | High frequency switching component with electrostatic surge elimination |
JP2007218859A (en) * | 2006-02-20 | 2007-08-30 | Mitsubishi Rayon Co Ltd | Flaw inspection device of porous hollow yarn film |
JP2015509587A (en) * | 2012-02-22 | 2015-03-30 | イーオーピー マリーネ ア−・エスIop Marine A/S | Method for testing a gas shut-off valve and system for carrying out this method |
US9599530B2 (en) | 2012-02-22 | 2017-03-21 | Iop Marine A/S | Method of testing a gas shut-down valve and a system for exercising the method |
CN110411673A (en) * | 2019-08-16 | 2019-11-05 | 烟台中宇航空液压有限公司 | A kind of hydraulic part air seal test platform |
WO2023120621A1 (en) * | 2021-12-24 | 2023-06-29 | 株式会社キッツ | Valve seat inspection method and valve seat inspection device using image recognition camera |
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