CH412397A - Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans - Google Patents

Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans

Info

Publication number
CH412397A
CH412397A CH974164A CH974164A CH412397A CH 412397 A CH412397 A CH 412397A CH 974164 A CH974164 A CH 974164A CH 974164 A CH974164 A CH 974164A CH 412397 A CH412397 A CH 412397A
Authority
CH
Switzerland
Prior art keywords
chambers
chamber
bath
pressurized gas
containers
Prior art date
Application number
CH974164A
Other languages
German (de)
Inventor
Maeder Karl
Original Assignee
Maeder Karl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Maeder Karl filed Critical Maeder Karl
Priority to CH974164A priority Critical patent/CH412397A/en
Priority to FR25785A priority patent/FR1441963A/en
Priority to GB3162765A priority patent/GB1063006A/en
Publication of CH412397A publication Critical patent/CH412397A/en

Links

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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G01M3/229—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators removably mounted in a test cell
    • 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
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • 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
    • G01M3/002—Investigating fluid-tightness of structures by using thermal means
    • 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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • 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
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • 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
    • 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
    • F17C2260/038—Detecting leaked fluid
    • 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
    • F17C2270/00—Applications
    • F17C2270/07—Applications for household use
    • F17C2270/0718—Aerosols

Description

  

  
 



  Verfahren und Vorrichtung zum   Dichtigkeitsprüfen    von ein unter Druck stehendes Gas enthaltenden Behältern, insbesondere Aerosol-Dosen
Das Patent betrifft ein Verfahren zum Dichtigkeitsprüfen von ein unter Druck stehendes Gas enthaltenden Behältern, wie z. B. Aerosol-Dosen, und eine Vorrichtung zur Durchführung des Verfahrens.



   Das Verfahren ist erfindungsgemäss Idadurch gekennzeichnet, dass leder Behälter in eine Kammer eingebracht und die Kammer   abgeschlossen    wird, dass die Behälter   gewärrnt    werden, dass der Inhalt jeder Kammer nach einer vorbestimmten Zeit abge   saugt und gleichzeitig auf Spuren des s in den Behältern    unter Druck stehenden Gases geprüft wird.



   Die Vorrichtung zur Durchführung Ides Verfahrens besitzt erfindungsgemäss eine eine Heizzone durchquerende Fördervorrichtung für die Kammern und mindestens ein an der    lustrittsstelle    der Kammern, am Ende der Heizzone, an jede Kammer anschliessbares   Gasspürgerät.   



   Anhand der Zeichnung, die ein Ausführungsbeispiel der erfindungsgemässen Vorrichtung darstellt, wird nachfolgend eine beispielsweise Ausführungsform   Ides    Verfahrens nach der Erfindung   erw    läutert.



   Fig. 1 zeigt schematisch die Vorrichtung zur Durchführung des Verfahrens.



   Fig. 2 zeigt einen Schnitt durch eine der in Fig. 1 schematisch dargestellten, als Glocken ausgebildeten Kammern.



   In Fig. 1 ist ein Hebetisch 1 dargestellt, dem die Behälter, z. B. Aerosol-Dosen (nicht dargestellt) mittels eines Förderbandes 2 zugeführt werden.



   Eine in sich geschlossene Rollschiene 4, an welcher die als Glocken ausgebildeten Kammern 3 laufgehängt und bewegbar geführt sind, führt über den Hebetisch 1 hinweg, fällt gegen ein Bad 5 herab, verläuft über das Bad 5 hinweg und steigt anschlie ssend wieder an, um zuletzt zum Hebetisch 1 zurückzukehren. Durch den Hebetisch 1 werden die Aerosol-Dosen nacheinander je in eine als Glocke ausgebildete Kammer 3 automatisch eingebracht und befestigt.



   Die   zdie    Aerosol-Dosen enthaltenden Glocken 3 werden auf   Ider    oberhalb des gewärmten Bades 5 verlaufenden Rollschiene 4 fortbewegt, wobei, sie in das Bad 5 teilweise eintauchen und dadurch verschlossen werden. Ferner   werden    die Dosen   durch    das   glewärmte    Bad 5, welches eine Temperatur von   60-650C    aufweist, erhitzt, um den erforderlichen Prüfdruck in den Dosen zu erhalten. Am Austrittsende des Bades wird an einer Prüfstelle 6 jede Glocke 3 mittels einer nicht gezeigten Zentriervorrichtung und durch einen an der Glocke 3 vorgesehenen Absaugstutzen (siehe   Fig. 2)    evakuiert.



  Die abgesaugte Luft wird mittels eines Gasspürgerätes geprüft, um festzustellen, ob Gas aus der Dose entwichen ist. Gleichzeitig wird jede Dose gezählt.



      Ist die Messung negativ, so wird die Glocke e 3    mit der Dose an den - unter einem Winkel von 450 - ansteigenden Abschnitt der Rollschiene 4 aus dem Bad herausgehoben. An einer   Ausladestelle    7   wird d die Dose automatisch freigegeben.   



   Misst hingegen das Gasspürgerät   Spuren    des   ient-      wichenen    Gases, so wird die Dose, die leck ist, sofort in nachfolgend beschriebener   Weise    automatisch gelöst und fällt in das Bad 5, dort wo die Rollschiene 4 um 450 ansteigt.



   Eine Trennwand 8 dient dazu, die ausgeschiedenen Dosen vom übrigen Teil des Bades   fernnu-    halten.



   Die in Fig. 2 dargestellte Glocke weist einen eine Aerosol-Dose 1 enthaltenden Umhüllungszylinder 2. auf, dessen oberer Deckel 3 als Zangenträger für Zangenelemente 4 ausgebildet ist. Diese Elemente 4  dienen zum Festhalten der Behälter während des Prüfvorganges. Oberhalb des Deckels 3 befindet sich ein Gehäuse 5 für eine Spreizvorrichtung, die aus drei Teilen besteht, und zwar aus einem Spreizkonus 10, der mit einem Druckknopf 11 verbunden ist, einer Rückstossfeder 14 sowie einer Ausschaltvorrichtung, die aus einem Ausschaltknopf 12 und einem Arretierstift 13 besteht.



   An dem Gehäuse 5 ist ein mit zwei Rollen 6 und 7 versehener Aufhängearm 8 befestigt. Die beiden Rollen 6 und 7 umschliessen teilweise die Rollschiene derart, dass die Glocke sich längs   der    selben fortbewegen, aber diese nicht verlassen kann.



   Die im Deckel 3 vorgesehenen Zangenelemente 4 sind vom Spreizkonus 10 festgeklemmt. Eine nicht gezeigte Vorrichtung,   welche    pneumatisch, hydraulisch, mechanisch oder magnetisch betätigt werden kann, wird durch einen Impuls des Gasspürgerätes derart   gesteuert,    dass bei Anwesenheit von Gasspuren der Anschaltknopf 12 eingedrückt und der Arretierstift 13 zurückgezogen wird. Dabei wird der Spreizkonus 10 mit dem Druckknopf 11 durch die Rückstossfeder 14 nach oben gedrückt, so dass die Zangenelemente 4 mittels der Federn 15 gegeneinander gepresst werden. Die aus den Elementen 4 bestehende Zange ist so geöffnet, und die Dose löst sich. Die Glocke weist ferner einen Ansaugstutzen 16 und ein Entlüftungsrohr 17 auf, welches das Flüssigkeitsniveau in der Glocke immer auf der gleichen Höhe hält, wenn die Glocke im Bad eingetaucht ist.

   Die Verweilzeit der Dosen im Bad, welche erforderlich ist, um eine zum Messen ausreichende Menge des entwichenen Gases zu erhalten, wird durch   EinF    stellung der Vorschubsgeschwindigkeit der Glocke auf der Schiene bestimmt und beträgt üblicherweise etwa fünf Minuten.   



  
 



  Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans
The patent relates to a method for leak testing of a pressurized gas containing containers such. B. aerosol cans, and a device for performing the method.



   The method according to the invention is characterized in that the container is placed in a chamber and the chamber is closed, that the containers are warmed, that the contents of each chamber are sucked off after a predetermined time and at the same time for traces of the gas under pressure in the containers is checked.



   According to the invention, the device for carrying out the method has a conveying device for the chambers that traverses a heating zone and at least one gas detector which can be connected to each chamber at the outlet point of the chambers, at the end of the heating zone.



   With reference to the drawing, which shows an embodiment of the device according to the invention, an example embodiment of the method according to the invention will be explained below.



   Fig. 1 shows schematically the device for performing the method.



   FIG. 2 shows a section through one of the chambers, which are shown schematically in FIG. 1 and designed as bells.



   In Fig. 1, a lifting table 1 is shown to which the container, for. B. aerosol cans (not shown) are supplied by means of a conveyor belt 2.



   A self-contained roller rail 4, on which the chambers 3 designed as bells are suspended and movably guided, leads over the lifting table 1, falls down towards a bath 5, runs over the bath 5 and then rises again to last return to lift table 1. By means of the lifting table 1, the aerosol cans are automatically introduced one after the other into a chamber 3 designed as a bell and fastened.



   The bells 3 containing the aerosol cans are moved on the roller rail 4 running above the heated bath 5, they are partially immersed in the bath 5 and thereby closed. Furthermore, the cans are heated by the heated bath 5, which has a temperature of 60-650C, in order to obtain the required test pressure in the cans. At the outlet end of the bath, each bell 3 is evacuated at a test point 6 by means of a centering device (not shown) and through a suction nozzle (see FIG. 2) provided on bell 3.



  The extracted air is checked using a gas detector to determine whether gas has escaped from the can. At the same time, each can is counted.



      If the measurement is negative, the bell e 3 with the can is lifted out of the bath at the section of the roller rail 4 which rises at an angle of 450. At an unloading point 7, the can is automatically released.



   If, on the other hand, the gas detector measures traces of the escaped gas, the leaked can is automatically released immediately in the manner described below and falls into the bath 5, where the roller rail 4 rises by 450.



   A partition 8 is used to keep the discharged cans away from the rest of the bath.



   The bell shown in FIG. 2 has a covering cylinder 2 containing an aerosol can 1, the upper cover 3 of which is designed as a tong carrier for tong elements 4. These elements 4 are used to hold the container in place during the testing process. Above the cover 3 there is a housing 5 for an expansion device, which consists of three parts, namely an expansion cone 10 which is connected to a push button 11, a recoil spring 14 and a switch-off device, which consists of a switch-off button 12 and a locking pin 13 consists.



   A suspension arm 8 provided with two rollers 6 and 7 is attached to the housing 5. The two rollers 6 and 7 partially enclose the roller rail in such a way that the bell moves along the same, but cannot leave it.



   The pincer elements 4 provided in the cover 3 are clamped by the expansion cone 10. A device, not shown, which can be operated pneumatically, hydraulically, mechanically or magnetically, is controlled by an impulse from the gas detection device in such a way that when there are traces of gas, the switch button 12 is pressed in and the locking pin 13 is withdrawn. The expansion cone 10 with the push button 11 is pressed upwards by the recoil spring 14 so that the forceps elements 4 are pressed against one another by means of the springs 15. The pliers consisting of the elements 4 are thus opened and the can is released. The bell also has a suction nozzle 16 and a vent pipe 17 which always keeps the liquid level in the bell at the same height when the bell is immersed in the bath.

   The dwell time of the cans in the bath, which is necessary in order to obtain a sufficient quantity of the escaped gas to measure, is determined by adjusting the speed of advance of the bell on the rail and is usually about five minutes.

Claims (1)

PATENTANSPRUCH 1 Verfahren zum Dichtigkeitsprüfen von ein unter Druck stehendes Gas enthaltenden Behältern, dadurch gekennzeichnet, dass jeder Behälter in eine Kammer eingebracht und die Kammer abgeschlossen wird, dass die Behälter gewärmt werden, dass der Inhalt jeder Kammer nach einer vorbestimmten Zeit abgesaugt und gleichzeitig auf Spuren des in den Behältern unter Druck stehenden Gases geprüft wird. PATENT CLAIM 1 Method for leak testing containers containing a pressurized gas, characterized in that each container is placed in a chamber and the chamber is closed, that the container is heated, that the contents of each chamber are sucked off after a predetermined time and at the same time for traces of the in the containers of pressurized gas is checked. UNTERANSPRÜCHE 1. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass die B.ehälter je in eine an ihrer Unterseite offene Kammer eingebracht und dieselbe durch Eintauchen in ein Flüssigkeitsbad abgeschlossen wird. SUBClaims 1. The method according to claim I, characterized in that the B. containers are each placed in a chamber open on its underside and the same is closed by immersion in a liquid bath. 2. Verfahren nach Unteranspruch 1, dadurch gekennzeichnet, dass das Bad erwärmt wird. 2. The method according to dependent claim 1, characterized in that the bath is heated. PATENTANSPRUCH II Vorrichtung zur Durchführung des Verfahrens nach Patentanspruch I, gekennzeichnet durch eine eine Heizzone, durchquerende Fördervorrichtung für die Kammern und mindestens ein an der Austrittsstelle der Kammern, am Ende der Heizzone, an jede Kammer anschliessbares Gasspürgerät. PATENT CLAIM II Device for carrying out the method according to claim 1, characterized by a conveying device for the chambers crossing a heating zone and at least one gas detection device which can be connected to each chamber at the exit point of the chambers, at the end of the heating zone. UNTERANSPRÜCHE 3. Vorrichtung nach Patentanspruch II, dadurch gekennzeichnet, dass die Heizzone durch ein Flüssigkeitsbad gebildet ist, welches eine Temperatur von 60O-65 C aufweist. SUBCLAIMS 3. Device according to claim II, characterized in that the heating zone is formed by a liquid bath which has a temperature of 60O-65C. 4. Vorrichtung nach Unteranspruch 3, dadurch gakennzeichnet, dass die Fördervorrichtung eine oberhalb des Bades angeordnete Rollschiene, an der die Kammern aufgehängt sind, aufweist, wobei die Schiene derart ausgebildet ist, dass die an ihrer Unterseite offenen Kammern beim Durchqueren der Heizzone teilweise in das Flüssigkeitsbad eintauchen, um einerseits die Kammern abzuschliessen und anderseits die in die Kammer eingebrachten Behälter zu erwärmen. 4. Device according to dependent claim 3, characterized in that the conveying device has a roller rail arranged above the bath, on which the chambers are suspended, the rail being designed such that the chambers which are open on their underside when crossing the heating zone partially into the Immerse the liquid bath, on the one hand, to close the chambers and, on the other hand, to heat the containers placed in the chamber. 5. Vorrichtung nach Patentanspruch II und Unteranspruch 4, dadurch gekennzeichnet, dass die Kammern als Glocken ausgebildet sind d und Mittel zur Befestigung der Behälter aufweisen. 5. Device according to claim II and dependent claim 4, characterized in that the chambers are designed as bells and have means for fastening the container.
CH974164A 1964-07-24 1964-07-24 Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans CH412397A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH974164A CH412397A (en) 1964-07-24 1964-07-24 Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans
FR25785A FR1441963A (en) 1964-07-24 1965-07-23 Method and device for checking the tightness of containers containing a gas under pressure, in particular aerosol cans
GB3162765A GB1063006A (en) 1964-07-24 1965-07-23 Improvements in or relating to a method and apparatus for testing pressurized containers for leaks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH974164A CH412397A (en) 1964-07-24 1964-07-24 Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans

Publications (1)

Publication Number Publication Date
CH412397A true CH412397A (en) 1966-04-30

Family

ID=4355166

Family Applications (1)

Application Number Title Priority Date Filing Date
CH974164A CH412397A (en) 1964-07-24 1964-07-24 Method and device for leak testing of containers containing pressurized gas, in particular aerosol cans

Country Status (2)

Country Link
CH (1) CH412397A (en)
GB (1) GB1063006A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112460480A (en) * 2021-01-08 2021-03-09 南京康尤为贸易有限公司 Liquid oxygen storage tank valve monitoring safety device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1923012A1 (en) * 1969-05-06 1970-11-19 Schwarzkopf Gmbh Hans Device for testing the tightness of containers, especially aerosol cans
US3675469A (en) * 1970-11-25 1972-07-11 Merck & Co Inc Apparatus for detecting aerosol leakage
GB1350187A (en) * 1972-02-01 1974-04-18 Jenkins A Method and apparatus for leak testing sealed containers
GB2496665A (en) * 2011-11-18 2013-05-22 Framo Eng As Pressure Testing Subsea Modules, Piping or Components
CN113203042B (en) * 2021-04-01 2021-12-31 无锡恒大电子科技有限公司 Full-automatic special gas delivery cabinet leakage detection device
EP4286821A1 (en) * 2022-06-02 2023-12-06 SCHOTT Pharma Schweiz AG Method of determining a container tightness

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112460480A (en) * 2021-01-08 2021-03-09 南京康尤为贸易有限公司 Liquid oxygen storage tank valve monitoring safety device
CN112460480B (en) * 2021-01-08 2022-08-19 湖南昇宇科技开发有限公司 Liquid oxygen storage tank valve monitoring safety device

Also Published As

Publication number Publication date
GB1063006A (en) 1967-03-22

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