EP0358176A2 - Method and device for interrupting a refrigerating circuit - Google Patents

Method and device for interrupting a refrigerating circuit Download PDF

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Publication number
EP0358176A2
EP0358176A2 EP89116415A EP89116415A EP0358176A2 EP 0358176 A2 EP0358176 A2 EP 0358176A2 EP 89116415 A EP89116415 A EP 89116415A EP 89116415 A EP89116415 A EP 89116415A EP 0358176 A2 EP0358176 A2 EP 0358176A2
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EP
European Patent Office
Prior art keywords
compressor
collecting container
refrigerant circuit
refrigerant
valve
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.)
Withdrawn
Application number
EP89116415A
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German (de)
French (fr)
Other versions
EP0358176A3 (en
Inventor
Wilhelm Niessen
Hartmut Guderley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of EP0358176A2 publication Critical patent/EP0358176A2/en
Publication of EP0358176A3 publication Critical patent/EP0358176A3/en
Withdrawn legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00Arrangements for charging or discharging refrigerant

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device for carrying it out.
  • a separate device with a compressor is known for the disposal of refrigerant circuits, which in particular contain environmentally harmful refrigerants based on chlorofluorocarbons (DD-PS 902 511), in which filters and a condenser are switched into a pipeline on the pressure side of the compressor opens into a container for the condensed refrigerant.
  • the procedure is such that the compressor is connected with its suction side to the refrigerant circuit to be disposed of.
  • the refrigerant is sucked out of this refrigeration cycle, which contains at least one condenser, a throttle element, an evaporator and a compressor.
  • the disposal facility provided for this requires a high level of equipment, which can only be transported with difficulty and therefore z. B. is only of limited use for customer service.
  • the invention is based on the object of specifying a method according to the preamble of claim 1 and a device for carrying it out, by means of which simplified disposal of a refrigerant circuit can be carried out.
  • a normally closed, but then openable valve can be provided during the manufacture of the device, which valve is provided with connecting means for the collecting container.
  • a piercing valve can also be attached to the removal point, which is connected to the collecting container.
  • a shut-off device in the form of a shut-off valve or a pinch point can also be provided during the manufacture of the device.
  • a motor-operated compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 leading back to the compressor 1 are connected in series in a closed refrigerant circuit.
  • a removal point 6 for the refrigerant is provided immediately after the compressor 1 in the area of the downstream pressure pipe 5.
  • a closed container 8 for refrigerant can be connected via a valve 7 that is closed in normal operation.
  • the valve 7 can already be used in the production of the refrigerant circuit, but it is also possible to use a piercing valve that can be retrofitted to the pressure pipe 5.
  • the piercing valve 7 is connected to the collecting container 8, which does not have to be part of the device to be disposed of, but is designed to be reusable for customer service and disposal processes.
  • a shut-off device 9 is switched on, which is open in normal operation and is only closed when it is disposed of.
  • This shut-off device is preferably a manually operated shut-off valve, which is already installed during the manufacture of the refrigerant circuit.
  • the shut-off element 9 can, however, also be a tube section of the refrigerant circuit which can be squeezed together in cross section and which is only compressed to the extent that the refrigerant circuit is interrupted when it is disposed of.
  • the compressor 1 assigned to the refrigerant circuit can be started after opening the valve 7.
  • the refrigerant still present in the refrigerant circuit is drawn off and pumped into the collecting container 8.
  • the valve 7 or a valve assigned to the collecting container 8 can be closed.
  • the valve 7 is separated from the refrigerant circuit after the disposal process and is used for closing the collecting container.
  • the refrigerant collected in the receptacle 8 can be introduced into the refrigerant circuit, if necessary via a filter to be switched on, via the tapping point 6 and the valve 7 or via a filler neck 10 provided on the housing of the compressor 1. Otherwise, the collecting container 8 is fed to a reprocessing point.

Abstract

A refrigerating circuit which is to be interrupted contains a compressor (1), a condenser (2), a choke member (3) and an evaporator (4). In order to be able to interrupt this refrigerating circuit simply, there is provided in the region of the pressure pipe (5) after the compressor (1) an extraction point (6) at which a collecting container (8) for coolant can be applied via a connection piece (7). When the valve (7) is open, by means of switching on the compressor (1) with the subsequent refrigerating circuit blocked off, the coolant contained therein can be pumped into the collecting container (8). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des 1. Anspruchs sowie eine Vorrichtung zu dessen Durchführung.The invention relates to a method according to the preamble of claim 1 and a device for carrying it out.

Zur Entsorgung von Kältemittelkreisläufen, die insbesondere umweltschädliches Kältemittel auf der Basis von Fluorchlorkohlenwasserstoffen enthalten, ist eine eigenständige Vorrichtung mit einem Kompressor bekannt (DD-­PS 902 511), bei welcher auf der Druckseite des Kompressors Filter und ein Kondensator in eine Rohrleitung eingeschaltet sind, die in einen Auffangbehälter für das kondensierte Kältemittel mündet. Bei der Entsorgung wird hierbei so verfahren, daß der Kompressor mit seiner Saugseite an den zu entsorgenden Kältemittelkreislauf angeschlossen wird. Hierdurch wird aus diesem Kältekreislauf, der zumindest einen Kondensator, ein Drosselorgan, einen Verdampfer und einen Verdichter enthält, das Kältemittel abgesaugt. Die hierfür vorgesehene Entsorgungseinrichtung erfordert jedoch einen hohen apparativen Aufwand, der noch dazu nur mit Schwierigkeiten transportiert werden kann und daher z. B. für den Kundendiensteinsatz nur beschränkt nutzbar ist.A separate device with a compressor is known for the disposal of refrigerant circuits, which in particular contain environmentally harmful refrigerants based on chlorofluorocarbons (DD-PS 902 511), in which filters and a condenser are switched into a pipeline on the pressure side of the compressor opens into a container for the condensed refrigerant. When disposing, the procedure is such that the compressor is connected with its suction side to the refrigerant circuit to be disposed of. As a result, the refrigerant is sucked out of this refrigeration cycle, which contains at least one condenser, a throttle element, an evaporator and a compressor. The disposal facility provided for this, however, requires a high level of equipment, which can only be transported with difficulty and therefore z. B. is only of limited use for customer service.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren gemäß dem Oberbegriff des 1. Anspruchs und eine Vorrichtung zu dessen Durchführung anzugeben, durch die eine vereinfachte Entsorgung eines Kältemittelkreislaufs durchführbar ist.The invention is based on the object of specifying a method according to the preamble of claim 1 and a device for carrying it out, by means of which simplified disposal of a refrigerant circuit can be carried out.

Die Lösung dieser Aufgabe erfolgt gemäß der Erfindung durch die kennzeichnenden Merkmale des 1. bzw. 3. Anspruchs.This object is achieved according to the invention by the characterizing features of the 1st or 3rd claim.

Bei einer Verfahrensweise gemäß der Erfindung wird die Tatsache ausgenutzt, daß bei der überwiegenden Zahl von zu entsorgenden Haushalts-Kühl- und/oder Gefriergeräten, Klimageräten oder Wärmepumpen der dem Kälktemittelkreislauf zugeordnete Verdichter noch funktionsfähig ist. Es braucht dann lediglich der Auffangbehälter auf der Druckseite des Verdichters an den Kältemittelkreislauf angeschlossen und anschließend dieser Verdichter eingeschaltet zu werden. Hierdurch wird der überwiegende Teil des Kältemittels vom geräteeigenen Verdichter in den Auffangbehälter gepumpt. Für eine weitgehende Entsorgung des Gerätekältemittelkreislaufs ist es dann vorteilhaft, wenn der Kältemittelkreislauf hinter der Anschlußstelle des Auffangbehälter verschlossen wird. Dann kann Kältemittel nicht mehr in den bestehenden Kältemittelkreislauf einströmen und der Verdichter saugt das darin noch enthaltene Kältemittel ab. Dabei kann es zweckmäßig sein, zur beschleunigten oder vollständigen Entfernung von Kältemittel aus dem einendig verschlossenen Kältemittelkreislauf nach einer gewissen Betriebszeit des Verdichters im Bereich der Verschlußstelle eine stark gedrosselte Luftzuführung, beispielsweise über einen Abschnitt eines Kapilarrohrs zeitlich begrenzt vorzunehmen, um Reste des Kältemittels auszuspülen.In a procedure according to the invention, the fact is exploited that the majority of household refrigerators and / or freezers, air conditioners or heat pumps to be disposed of still has the compressor assigned to the refrigerant circuit functioning. It is then only necessary to connect the collecting container on the pressure side of the compressor to the refrigerant circuit and then switch on this compressor. As a result, the major part of the refrigerant is pumped from the device's own compressor into the collecting container. For extensive disposal of the device refrigerant circuit, it is then advantageous if the refrigerant circuit is closed behind the connection point of the collecting container. Then refrigerant can no longer flow into the existing refrigerant circuit and the compressor sucks the refrigerant still contained in it. In order to accelerate or completely remove refrigerant from the single-ended refrigerant circuit after a certain operating time of the compressor, it may be expedient to provide a highly restricted air supply in the area of the closure point, for example over a section of a capillary tube, for a limited period of time in order to flush out residual refrigerant.

Für die Durchführung des Verfahren braucht im Übrigen nur im Bereich des Druckrohrstutzens des Verdichters eine Entnahmestelle vorgesehen zu werden, an welche der Auffangbehälter mit einem Anschlußstück ansetzbar ist. Hierzu kann bereits bei der Herstellung des Gerätes ein normalerweise geschlossenes, dann aber zu öffnendes Ventil vorgesehen werden, das mit Anschlußmitteln für den Auffangbehälter versehen ist. Es kann jedoch auch im Entsorgungsfall an die Entnahmestelle ein Anstechventil angesetzt werden, das mit dem Auffangbehälter verbunden ist. Für das Verschließen des Kältemittelkreislaufs nach der Entnahmestelle kann ebenfalls bei der Herstellung des Gerätes ein Absperrorgan in Form eines Absperrventils oder einer Quetschstelle vorgesehen werden.To carry out the method, one only needs one in the area of the pressure pipe socket of the compressor To be provided tapping point to which the collecting container can be attached with a connector. For this purpose, a normally closed, but then openable valve can be provided during the manufacture of the device, which valve is provided with connecting means for the collecting container. However, in the event of disposal, a piercing valve can also be attached to the removal point, which is connected to the collecting container. To close the refrigerant circuit after the tapping point, a shut-off device in the form of a shut-off valve or a pinch point can also be provided during the manufacture of the device.

Die Erfindung ist nachfolgend anhand der Prinzipdarstellung eines zu entsorgenden Kältemittelkreislaufs näher erläutert.The invention is explained in more detail below on the basis of the basic illustration of a refrigerant circuit to be disposed of.

In einem geschlossenen Kältemittelkreislauf sind in Hintereinanderschaltung ein motorbetriebener Verdichter 1, ein Verflüssiger 2, ein Empansionsventil 3 und ein zurück zum Verdichter 1 führender Verdampfer 4 geschaltet. Um das in diesem Kältemittelkreislauf enthaltene Kältemittel im Bedarfsfall entsorgen zu können, ist unmittelbar nach dem Verdichter 1 im Bereich des nachfolgenden Druckrohres 5 eine Entnahmestelle 6 für das Kältemittel vorgesehen. An dieser Entnahmestelle ist über ein im normalen Betriebsfall geschlossenens Ventil 7 ein geschlossener Aufbehälter 8 für Kältemittel anschließbar. Das Ventil 7 kann dabei bereits bei der Herstellung des Kältemittelkreislaufs mit angesetzt werden, es ist jedoch auch möglich, dafür ein nachträglich an das Druckrohr 5 ansetzbares Anstechventil zu verwenden. In diesem Falle ist das Anstechventil 7 mit dem Auffangbehälter 8 verbunden, der nicht Bestandteil des zu entsorgenden Gerätes sein muß, sondern wiederverwendbar für Kundendienst und Entsorgungsvorgänge ausgebildet ist. Zusätzlich ist in Strömungsrichtung nach der Entnahmestelle 6 in den Kältemittelkreislauf ein Absperrorgan 9 eingeschaltet, das im normalen Betriebsfall offen ist und nur im Entsorgungsfall geschlossen wird. Dieses Absperrorgan ist vorzugsweise ein manuell betätigbares Absperrventil, das bereits bei der Herstellung des Kältemittelkreislaufes mit eingebaut wird. Das Absperrorgan 9 kann jedoch auch ein im Querschnitt zusammenquetschbarer Rohrabschnitt des Kältemittelkreislaufs sein, der erst im Entsorgungsfalle soweit zusammengedrückt wird, daß der Kältemittelkreislauf unterbrochen ist.A motor-operated compressor 1, a condenser 2, an expansion valve 3 and an evaporator 4 leading back to the compressor 1 are connected in series in a closed refrigerant circuit. In order to be able to dispose of the refrigerant contained in this refrigerant circuit if necessary, a removal point 6 for the refrigerant is provided immediately after the compressor 1 in the area of the downstream pressure pipe 5. At this removal point, a closed container 8 for refrigerant can be connected via a valve 7 that is closed in normal operation. The valve 7 can already be used in the production of the refrigerant circuit, but it is also possible to use a piercing valve that can be retrofitted to the pressure pipe 5. In this case, the piercing valve 7 is connected to the collecting container 8, which does not have to be part of the device to be disposed of, but is designed to be reusable for customer service and disposal processes. In addition, it is in the flow direction after the tapping point 6 in the refrigerant circuit, a shut-off device 9 is switched on, which is open in normal operation and is only closed when it is disposed of. This shut-off device is preferably a manually operated shut-off valve, which is already installed during the manufacture of the refrigerant circuit. The shut-off element 9 can, however, also be a tube section of the refrigerant circuit which can be squeezed together in cross section and which is only compressed to the extent that the refrigerant circuit is interrupted when it is disposed of.

Bei verschlossenem Absperrorgan 9 und angeschlossenem Auffangbehälter 8 kan nach dem Öffnen des Ventils 7 der dem Kältemittelkreislauf zugeordnete Verdichter 1 in Gang gesetzt werden. Hierdurch wird das noch im Kältemittelkreislauf vorhandene Kältemittel abgesaugt und in den Auffangbehälter 8 gepumpt. Nach Abschluß des Abpumpvorganges kann das Ventil 7 oder ein dem Auffangbehälter 8 zugeordnetes Ventil geschlossen werden. Vorzugsweise wird jedoch das Ventil 7 nach dem Entsorgungsvorgang vom Kältemittelkreislauf abgetrennt und für den Verschluß des Auffangbehälters genutzt.When the shut-off device 9 is closed and the collecting container 8 is connected, the compressor 1 assigned to the refrigerant circuit can be started after opening the valve 7. As a result, the refrigerant still present in the refrigerant circuit is drawn off and pumped into the collecting container 8. After completion of the pumping process, the valve 7 or a valve assigned to the collecting container 8 can be closed. Preferably, however, the valve 7 is separated from the refrigerant circuit after the disposal process and is used for closing the collecting container.

Nach einer Reparatur des Kältemittelkreislaufs kann das im Auffangbehälter 8 gesammelte Kältemittel ggf. über ein einzuschaltendes Filter wieder über die Entnahmestelle 6 und das Ventil 7 oder über einen am Gehäuse des Verdichters 1 vorhandenen Füllstutzen 10 in den Kältemittelkreislauf eingeleitet werden. Anderfalls wird der Auffangbehälter 8 einer Wiederaufbereitungsstelle zugeführt.After the refrigerant circuit has been repaired, the refrigerant collected in the receptacle 8 can be introduced into the refrigerant circuit, if necessary via a filter to be switched on, via the tapping point 6 and the valve 7 or via a filler neck 10 provided on the housing of the compressor 1. Otherwise, the collecting container 8 is fed to a reprocessing point.

Claims (8)

1. Verfahren zur Entsorgung eines Kältemittelkreislaufs, in dem ein Verdichter vorgesehen ist, wobei Kältemittel aus dem Kreislauf in einen Auffangbehälter gepumpt wird, insbesondere für Haushalt-Kühl- und/oder Gefriergeräte bzw. Wärmepumpen, dadurch gekennzeichnet, daß der Auffangbehälter auf der Druckseite des Verdichters an den Kältemittelkreislauf angeschlossen und anschließend der Verdichter eingeschaltet wird.1. A method for disposing of a refrigerant circuit in which a compressor is provided, wherein refrigerant is pumped from the circuit into a collecting container, in particular for household refrigerators and / or freezers or heat pumps, characterized in that the collecting container on the pressure side of the Compressor connected to the refrigerant circuit and then the compressor is turned on. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Kältemittelkreislauf hinter der Anschlußstelle des Auffangbehälters verschlossen wird.2. The method according to claim 1, characterized in that the refrigerant circuit is closed behind the connection point of the collecting container. 3. Vorrichtung zur Durchführung des Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß im Bereich des Druckrohres (5) nach deren Verdichter (1) eine Entnahmestelle (6) vorgesehen ist, an welche der Auffangbehälter (8) mit einem Anschlußstück aussetzbar ist.3. A device for performing the method according to claim 1 or 2, characterized in that in the region of the pressure pipe (5) after the compressor (1) a removal point (6) is provided, to which the collecting container (8) can be deployed with a connector . 4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß an der Entnahmestelle ein öffenbares Ventil (7) vorgesehen ist, an das der Auffangbehälter (8) anzuschließen ist.4. The device according to claim 3, characterized in that an openable valve (7) is provided at the removal point to which the collecting container (8) is to be connected. 5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß in Strömungsrichtung des Kältemittels nach der Entnahmestelle (6) im Kältemittelkreislauf ein Absperrorgan (9) angeordnet ist.5. Apparatus according to claim 3 or 4, characterized in that a shut-off device (9) is arranged in the flow direction of the refrigerant after the removal point (6) in the refrigerant circuit. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Absperrorgan ein zu schließenes Ventil (9) ist.6. The device according to claim 5, characterized in that the shut-off element is a valve to be closed (9). 7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das Absperrorgan ein im Querschnitt zusammenquetschbarer Rohrabschnitt ist.7. Apparatus according to claim 5 or 6, characterized in that the shut-off element is a tube section which can be squeezed together in cross section. 8. Vorrichtung nach Anspruch 3 oder einem der folgenden, dadurch gekennzeichnet, daß an der Entnahmestelle ein Anstechventil angeordnet ist.8. The device according to claim 3 or one of the following, characterized in that a piercing valve is arranged at the removal point.
EP89116415A 1988-09-09 1989-09-06 Method and device for interrupting a refrigerating circuit Withdrawn EP0358176A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3830718 1988-09-09
DE19883830718 DE3830718A1 (en) 1988-09-09 1988-09-09 METHOD AND DEVICE FOR THE DISPOSAL OF A REFRIGERANT CIRCUIT

Publications (2)

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EP0358176A2 true EP0358176A2 (en) 1990-03-14
EP0358176A3 EP0358176A3 (en) 1990-07-18

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EP89116415A Withdrawn EP0358176A3 (en) 1988-09-09 1989-09-06 Method and device for interrupting a refrigerating circuit

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EP (1) EP0358176A3 (en)
DE (1) DE3830718A1 (en)
DK (1) DK397189A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991002932A1 (en) * 1989-08-16 1991-03-07 Ashland Oil, Inc. Flexible gas salvage containers and process for use
EP0931992A3 (en) * 1998-01-17 2005-03-30 Tsuneo Arii Method of recovering a coolant, apparatus therefor, tool therefor and three-way valve for recovering a pressurized fluid

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181854A (en) * 1937-07-28 1939-11-28 Westinghouse Electric & Mfg Co Refrigeration apparatus and method
US2214699A (en) * 1939-04-08 1940-09-10 Westinghouse Electric & Mfg Co Refrigeration method
US2226851A (en) * 1938-04-11 1940-12-31 Imp Brass Mfg Co Charging mechanism
US2464563A (en) * 1946-03-27 1949-03-15 Nash Kelvinator Corp Refrigeration charging and evacuation apparatus
US2614400A (en) * 1950-01-06 1952-10-21 Meco Pilot Mfg Company Charging valve in refrigeration apparatus
US3232070A (en) * 1963-05-17 1966-02-01 Spormac Sales Company Refrigerant saver
US3243969A (en) * 1964-01-27 1966-04-05 Lennox Ind Inc Arrangement and method for charging refrigerant into a capillary-controlled refrigeration system
US3548861A (en) * 1969-05-19 1970-12-22 John W Mullins Line tapping service valve
US4069686A (en) * 1976-09-07 1978-01-24 Hoelman Walter A Coupling for use in servicing air conditioning systems
US4285206A (en) * 1979-02-05 1981-08-25 Draf Tool Co., Inc. Automatic refrigerant recovery, purification and recharge apparatus
DE3136608A1 (en) * 1981-09-15 1983-03-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method of sealed closing of a filling pipe

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181854A (en) * 1937-07-28 1939-11-28 Westinghouse Electric & Mfg Co Refrigeration apparatus and method
US2226851A (en) * 1938-04-11 1940-12-31 Imp Brass Mfg Co Charging mechanism
US2214699A (en) * 1939-04-08 1940-09-10 Westinghouse Electric & Mfg Co Refrigeration method
US2464563A (en) * 1946-03-27 1949-03-15 Nash Kelvinator Corp Refrigeration charging and evacuation apparatus
US2614400A (en) * 1950-01-06 1952-10-21 Meco Pilot Mfg Company Charging valve in refrigeration apparatus
US3232070A (en) * 1963-05-17 1966-02-01 Spormac Sales Company Refrigerant saver
US3243969A (en) * 1964-01-27 1966-04-05 Lennox Ind Inc Arrangement and method for charging refrigerant into a capillary-controlled refrigeration system
US3548861A (en) * 1969-05-19 1970-12-22 John W Mullins Line tapping service valve
US4069686A (en) * 1976-09-07 1978-01-24 Hoelman Walter A Coupling for use in servicing air conditioning systems
US4285206A (en) * 1979-02-05 1981-08-25 Draf Tool Co., Inc. Automatic refrigerant recovery, purification and recharge apparatus
DE3136608A1 (en) * 1981-09-15 1983-03-31 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Method of sealed closing of a filling pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991002932A1 (en) * 1989-08-16 1991-03-07 Ashland Oil, Inc. Flexible gas salvage containers and process for use
EP0931992A3 (en) * 1998-01-17 2005-03-30 Tsuneo Arii Method of recovering a coolant, apparatus therefor, tool therefor and three-way valve for recovering a pressurized fluid

Also Published As

Publication number Publication date
DK397189D0 (en) 1989-08-11
DE3830718A1 (en) 1990-03-22
EP0358176A3 (en) 1990-07-18
DK397189A (en) 1990-03-10

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