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WO2015066159A1 - Appareil et procédé d'anti-refoulement - Google Patents

Appareil et procédé d'anti-refoulement Download PDF

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Publication number
WO2015066159A1
WO2015066159A1 PCT/US2014/062870 US2014062870W WO2015066159A1 WO 2015066159 A1 WO2015066159 A1 WO 2015066159A1 US 2014062870 W US2014062870 W US 2014062870W WO 2015066159 A1 WO2015066159 A1 WO 2015066159A1
Authority
WO
WIPO (PCT)
Prior art keywords
vacuum pump
electrical power
solenoid valve
electrical
solenoid
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.)
Ceased
Application number
PCT/US2014/062870
Other languages
English (en)
Inventor
Vincent J. BROWNING
Mike HEINHORST
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.)
R&R MECHANICAL Inc
Original Assignee
R&R MECHANICAL Inc
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 R&R MECHANICAL Inc filed Critical R&R MECHANICAL Inc
Publication of WO2015066159A1 publication Critical patent/WO2015066159A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/002—Collecting refrigerant from a cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/85986—Pumped fluid control
    • Y10T137/86002—Fluid pressure responsive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/85986—Pumped fluid control
    • Y10T137/86027—Electric

Definitions

  • the present disclosure generally relates to backflow prevention. More specifically, the present disclosure relates to an inline valve configured to prevent backflow in a closed refrigeration system upon loss of vacuum.
  • Some closed systems such as refrigeration systems, require initial evacuation of non-condensable gasses and other contaminants. In some situations, such systems will also require periodic evacuation to ensure continued efficient operation and longevity of the system.
  • a vacuum pump is used to create and maintain a vacuum pressure on the system; this vacuum pressure is often maintained for extended durations - lasting several hours or even several days - to ensure complete system evacuation.
  • the modern trend of creating larger and more complex refrigeration systems is only increasing the duration of system evacuations.
  • the present disclosure is directed to an apparatus and method of backflow prevention which generally obviates the deficiencies cited above.
  • the present disclosure relates to an inline solenoid back flow preventer valve connected between a refrigeration system desired to be evacuated and a vacuum pump.
  • the inline solenoid valve shares a common electrical power source with the vacuum pump, such that a loss of power to the vacuum pump also causes a loss of power to the solenoid, which closes the back flow preventer valve during a loss of power condition.
  • the present disclosure further provides a method of installing and operating the inline solenoid valve, which comprises connecting a solenoid valve between a refrigeration system and a vacuum pump, energizing the solenoid valve's electrical end and the vacuum pump from a common electrical power source, and consistently providing electrical power to the solenoid valve's electrical end and the vacuum pump from a common electrical power source, causing the solenoid valve to remain open and the vacuum pump to remain operating and drawing a vacuum on the refrigeration system.
  • the back flow preventer valve may be energized from a separate power source from the vacuum pump and includes a sensor to monitor the operation status of the vacuum pump.
  • a relay may cause the backflow preventer valve to shut if the sensor determines a failure or de-energizing of the vacuum pump.
  • FIG. 1 is a block diagram of a backflow preventer apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 2 is a block diagram of a backflow preventer apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 3 is a block diagram of a backflow preventer apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 4 is a block diagram of a backflow preventer apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 5 is a block diagram of a backflow preventer apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 6 is a flow diagram of a method of testing the operation of a backflow prevention apparatus in accordance with some embodiments of the present disclosure.
  • refrigeration systems require a moisture- and contaminant- free environment to efficiently operate. Removal of air and other non-condensable gasses is known as degassing and removal of moisture is known as dehydration. The process of removing non-condensable gasses, moisture, and other contaminants is typically referred to as evacuation. The evacuation process is periodically or occasionally necessary to ensure the continued efficient operation of a refrigeration system.
  • the evacuation process also serves the purpose of removing water vapor from the system.
  • Very small amounts of water present in a refrigeration system combine with heat and refrigerant to form acids. Acids mix with oil and metal parts within the system to form sludge which can clog and damage the refrigeration unit.
  • the water vapor may freeze during operation of the refrigeration system, creating another potential obstruction in the system and further reducing system efficiency.
  • Evacuation is achieved by installing a suction line, for example in the form of a refrigeration hose, to the system and attaching a vacuum pump, which is also referred to as an evacuation pump.
  • a vacuum atmosphere is required since moisture can only be removed from a system in vapor form. Consequently, a completely sealed evacuation environment is necessary to establish a deep vacuum and perform the evacuation.
  • the present disclosure provides a solution to the problem of re- contamination of a partially-evacuated refrigeration systems due to loss of power at the vacuum pump.
  • the present disclosure may reasonably be applied to other fields and endeavors with equal success.
  • FIG. 1 is a block diagram of a backflow preventer apparatus 100 in accordance with some embodiments of the present disclosure.
  • a refrigeration system 10 which is desired to be evacuated may be connected to a vacuum pump 16 via a first hose 15.
  • vacuum pump 16 has a built-in solenoid valve 12, comprising a solenoid valve end 14 and a solenoid electrical end 13, attached to the suction connection 17 or suction manifold of the vacuum pump 16. Solenoid valve 12 and vacuum pump 16 receive electrical power from power source 18.
  • vacuum pump 16 and solenoid valve 12 may be separate with the solenoid valve 12 located in the first hose 15 on the suction path side of the vacuum pump 16.
  • First hose 15 may be connected to refrigeration system 10 via a service port 20 on refrigeration system 10.
  • first hose 15 is a 1 ⁇ 4 inch charging hose rated for 800 psi working pressure and 4,000 psi burst pressure.
  • 1 ⁇ 4 inch brass refrigeration fittings are used to connect first hose 15 to refrigeration system 10 and solenoid valve end 14.
  • solenoid valve 12 is configured to fail shut; that is, the solenoid valve end 14 will remain shut unless solenoid electrical end 13 is energized. When solenoid electrical end 13 is de-energized, solenoid valve end 14 is shut.
  • the solenoid electrical end 13 is a MKC- 1 coil by the Sporlan Division of Parker Hannifin Corporation.
  • the solenoid valve end 14 is a W3 valve also by the Sporlan Division of Parker Hannifin Corporation.
  • solenoid valve end 14 comprises a gate, ball, globe, or similar mechanical or pneumatic valve which is operated (i.e. opened and shut) by solenoid electrical end 13.
  • solenoid valve 12 and vacuum pump 16 share a common electrical power source 18.
  • this is implemented by connecting a standard 3 -prong, 1 10V power cord for powering the solenoid electrical end 13 in parallel with a standard 3 -prong, 1 10V power cord for powering the vacuum pump 16. Connection in parallel can be achieved by connecting the power cord for the solenoid electrical end 13 and the power cord for the vacuum pump 16 to the same electrical outlet, or by employing an electrical power 'splitter' which takes a single power input and divides it into parallel power outputs.
  • power source 18 is a portable generator or similar mobile electrical power generating device.
  • electrical power is supplied to solenoid electrical end 13 via vacuum pump 16 rather than independent of vacuum pump 16. Put another way, electrical power runs from power source 18 to vacuum pump 16 and then to solenoid electrical end 13. In this embodiment, the effect remains that a loss of power to the vacuum pump 16 results in a loss of power to the solenoid electrical end 13, causing solenoid valve end 14 to shut.
  • electrical power is supplied to solenoid valve 12 and vacuum pump 16 from two independent power sources.
  • additional instrumentation such as a pressure gage is provided on either side of the solenoid valve, or on the service connection of refrigeration system 10 or on the vacuum pump 16, to enable a user to verify solenoid valve 12 is open based on an equivalent pressure on either side of solenoid valve 12 and to verify that a desired vacuum pressure has been achieved.
  • a differential pressure gage is provided to measure the pressure difference across the solenoid valve 12. Differential pressure gage can be connected from first hose 15 to second hose 22, from refrigeration system 10 to suction connection 17, or in any other suitable configuration to measure the pressure difference across the solenoid valve 12.
  • an alarm (not shown) is operably connected between the electrical power source 18 and vacuum pump 16, between the electrical power source 18 and solenoid electrical end 13, or both.
  • the alarm is configured to alarm - aurally or visually - during a loss of power or interruption of power at the electrical power source 18.
  • Vacuum pump 16 may discharge the exhaust from refrigeration system 10 evacuation to the surrounding atmosphere 19. However, in some embodiments, additional connections can be made to discharge the evacuation exhaust to a holding tank, sequestered area, or other volume. For example, in some embodiments the vacuum pump 16 exhaust may be directed via additional hoses to an on-site storage tank.
  • solenoid electrical end 13 and vacuum pump 16 are energized from power source 18, causing solenoid valve end 14 to open and vacuum pump 16 to begin drawing a vacuum. So long as electrical power is consistently available solenoid electrical end 13 will remain energized, solenoid valve end 14 will remain open, and vacuum pump 16 will remain operating and drawing a vacuum on refrigeration system 10. However, in the event of a loss of electrical power the solenoid electrical end 13 and vacuum pump 16 de-energize. When solenoid electrical end 13 de- energizes, solenoid valve end 14 shuts, locking in vacuum pressure on the refrigeration system 10 and preventing the refrigeration system from returning to ambient pressure.
  • solenoid electrical end 13 and vacuum pump 16 are re-energized when electrical power is restored. Solenoid valve end 12 is re-opened and the evacuation continues.
  • a switch 51 is used to prevent re-energizing solenoid valve 12 and vacuum pump 16 once power is restored following an unexpected loss of power.
  • Switch 51 is configured to be shut manually (i.e. by human action) and to open upon a loss of electrical power. Thus once power is restored, solenoid valve 12 will not open and vacuum pump 16 will not resume pumping until manual intervention. Switch 51 therefore ensures proper oversight of the restart operation and prevents potential damage to vacuum pump 16.
  • FIG. 2 is a block diagram of a backflow preventer apparatus 200 in accordance with some embodiments of the present disclosure.
  • a refrigeration system 10 which is desired to be evacuated may be connected to a solenoid valve 12 via a first hose
  • a second hose 22 may connect the suction connection 17 of vacuum pump 16 to solenoid valve 12, which is disposed between refrigeration system 10 and vacuum pump
  • Solenoid valve 12 comprises a solenoid valve end 14 and a solenoid electrical end 13. Solenoid valve 12 and vacuum pump 16 may receive electrical power from power source 18.
  • FIG. 3 is a schematic diagram of a backflow preventer apparatus 300 in accordance with some embodiments of the present disclosure.
  • a refrigeration system 10 which is desired to be evacuated may be connected to a solenoid valve 12 via a first hose
  • a second hose 22 may connect the suction connection 17 of vacuum pump 16 to solenoid valve 12, which is disposed between refrigeration system 10 and vacuum pump
  • Solenoid valve 12 comprises a solenoid valve end 14 and a solenoid electrical end 13. Solenoid valve 12 and vacuum pump 16 receive electrical power from power source 18.
  • FIG. 3 illustrates those embodiments of the present disclosure which employ an electrical power 'splitter' to simultaneously and in parallel supply electrical power to solenoid electrical end 13 and vacuum pump 16.
  • solenoid valve 12 and vacuum pump 16 are independently powered. Solenoid electrical end 13 receives electrical power from first power source 42 and vacuum pump 16 receives electrical power from a second power source 44.
  • a sensor may be used to monitor the condition of the vacuum pump 16. In one embodiment, the sensor may measure the vacuum pressure on the suction side of the vacuum pump 16. In another embodiment, the sensor may measure the differential pressure across the vacuum pump 16. In yet another embodiment, the sensor may measure the electrical current applied to the vacuum pump 16, for example by using a current sensing relay in the electrical connection between the power source 44 and vacuum pump 16. The sensor may operationally connect to an relay 46 that supplies or interrupts electrical power to the solenoid electrical end 13. The various potential inputs to relay 46, described above, are illustrated in FIG.
  • the sensor If the sensor senses a condition that the vacuum pump 16 is not operating properly, the sensor triggers the relay 46 to remove power to the solenoid electrical end 13 thereby shutting solenoid valve end 12 and preventing backflow. In some
  • relay 46 is biased to remove power to solenoid electrical end 13 thereby shutting solenoid valve end 12 before the vacuum pump 16 has fully ceased pumping.
  • relay 46 can be set to remove power to solenoid electrical end 13 at a measured vacuum pump 16 suction pressure which indicates a possible problem with vacuum pump 16 but not necessarily a failure of vacuum pump 16.
  • a relay 46 may be configured to interrupt power to the vacuum pump 16.
  • relay 46 would receive input from the solenoid electrical end 13 to determine when solenoid valve 12 had lost power and was therefore shut.
  • the relay 46 is used to remove power from the vacuum pump 16 upon closure of the solenoid valve 12, to prevent any, or further, damage to the vacuum pump 16.
  • solenoid valve 12 is connected between refrigeration system 10 and vacuum pump 16.
  • solenoid electrical end is connected between refrigeration system 10 and vacuum pump 16.
  • solenoid valve 14 to open and vacuum pump 16 to begin drawing a vacuum.
  • additional instrumentation such as a pressure gage is provided on either side of the solenoid valve, or on the service connection of refrigeration system 10 or on the vacuum pump 16, to enable a user to verify solenoid valve 12 is open based on an equivalent pressure on either side of solenoid valve 12.
  • electrical power is consistently provided to solenoid electrical end 13 and vacuum pump 16, causing solenoid valve end 14 to remain open and vacuum pump 16 to remain operating and drawing a vacuum on refrigeration system 10.
  • a method 600 of testing the operation of a backflow prevention apparatus is also provided in the present disclosure.
  • Method 600 starts at block 601.
  • solenoid valve 12 is connected between refrigeration system 10 and vacuum pump 16.
  • solenoid electrical end 13 and vacuum pump 16 are energized from power source 18, causing solenoid valve end 14 to open and vacuum pump 16 to begin drawing a vacuum (block 604).
  • electrical power is secured to solenoid electrical end 13 and vacuum pump 16, causing solenoid electrical end 13 to de-energize, solenoid valve end 14 to shut, vacuum pressure on the refrigeration system 10 to become locked in, and preventing the refrigeration system from returning to ambient pressure.
  • instrumentation such as a pressure gage is connected to the vacuum side of solenoid valve 12 (i.e. - the side including refrigeration system 10 and first hose 15) to enable a user to verify vacuum pressure is maintained in refrigeration system after the loss of power.
  • system monitoring comprises block 606. In some embodiments, periodic
  • Method 600 ends at block 607.
  • the present disclosure provides numerous advantages over the prior art. Most notably, the present disclosure provides a means of positive closure to lock in vacuum pressure following a loss of the vacuum pump. This ability was lacking in prior art, particularly the use of check valves, to prevent backflow.
  • the present disclosure also links performance of the solenoid valve with the performance of the vacuum pump - either by a common electrical power source or by sensing means - to ensure these components work in tandem. Additionally, the present disclosure provides significant savings in time and money during a loss of vacuum pump while evacuating because the vacuum pressure is locked in, backflow into the refrigeration system is prevented, and the need to reset the vacuum pump may be obviated.
  • refrigeration system the apparatus and method disclosed herein can be applied to various additional closed systems which require the application of vacuum pressure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

L'invention concerne un appareil d'anti-refoulement qui comprend une électrovanne en ligne conçue pour être fermée lorsqu'elle est désactivée, disposée entre un système fermé destiné à être évacué et une pompe à vide, l'électrovanne en ligne et la pompe à vide partageant une source commune d'énergie électrique.
PCT/US2014/062870 2013-11-01 2014-10-29 Appareil et procédé d'anti-refoulement Ceased WO2015066159A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361898657P 2013-11-01 2013-11-01
US61/898,657 2013-11-01

Publications (1)

Publication Number Publication Date
WO2015066159A1 true WO2015066159A1 (fr) 2015-05-07

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PCT/US2014/062870 Ceased WO2015066159A1 (fr) 2013-11-01 2014-10-29 Appareil et procédé d'anti-refoulement

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US (1) US20150121936A1 (fr)
WO (1) WO2015066159A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3040475A1 (fr) * 2015-08-31 2017-03-03 Enertime Procede et dipositif de mise sous vide de circuit comportant un fluide de travail
WO2020240159A1 (fr) * 2019-05-30 2020-12-03 Aspen Pumps Limited Appareil de connexion à un système cvc-r pendant la maintenance ou la mise en service et procédés de maintenance ou de mise en service pour un système cvc-r
WO2020240158A1 (fr) * 2019-05-30 2020-12-03 Aspen Pumps Limited Pompe à vide destinée à être utilisée pendant la maintenance ou la mise en service d'un système cvc-r, adaptateur pour pompe à vide, et procédé de réalisation d'un test sous vide sur un système cvc-r

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018013109A (ja) * 2016-07-22 2018-01-25 株式会社島津製作所 排気システムおよび制御装置
EP4168678A4 (fr) * 2020-06-18 2024-06-19 Milwaukee Electric Tool Corporation Pompe à vide dotée d'une électrovanne
CN111927748A (zh) * 2020-06-19 2020-11-13 中国科学院微电子研究所 闸阀控制电路、抽真空设备以及真空室

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US4653286A (en) * 1985-12-16 1987-03-31 Carrier Corporation Discharge valve and baffle assembly for a refrigeration system
US5524449A (en) * 1992-05-29 1996-06-11 Daikin Industries, Ltd. System for controlling operation of refrigeration device
US20030101735A1 (en) * 2001-10-19 2003-06-05 Teague Merritt T. Beverage dispenser with integral ice maker
US20040103677A1 (en) * 2002-12-02 2004-06-03 Tgk Co., Ltd. Refrigeration system and method of operation therefor
US20050217313A1 (en) * 2004-04-06 2005-10-06 Tgk Co., Ltd. Refrigeration system
US20080229845A1 (en) * 2005-12-12 2008-09-25 Carrier Corporation Flowmeter Assembly

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US4653286A (en) * 1985-12-16 1987-03-31 Carrier Corporation Discharge valve and baffle assembly for a refrigeration system
US5524449A (en) * 1992-05-29 1996-06-11 Daikin Industries, Ltd. System for controlling operation of refrigeration device
US20030101735A1 (en) * 2001-10-19 2003-06-05 Teague Merritt T. Beverage dispenser with integral ice maker
US20040103677A1 (en) * 2002-12-02 2004-06-03 Tgk Co., Ltd. Refrigeration system and method of operation therefor
US20050217313A1 (en) * 2004-04-06 2005-10-06 Tgk Co., Ltd. Refrigeration system
US20080229845A1 (en) * 2005-12-12 2008-09-25 Carrier Corporation Flowmeter Assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3040475A1 (fr) * 2015-08-31 2017-03-03 Enertime Procede et dipositif de mise sous vide de circuit comportant un fluide de travail
WO2020240159A1 (fr) * 2019-05-30 2020-12-03 Aspen Pumps Limited Appareil de connexion à un système cvc-r pendant la maintenance ou la mise en service et procédés de maintenance ou de mise en service pour un système cvc-r
WO2020240158A1 (fr) * 2019-05-30 2020-12-03 Aspen Pumps Limited Pompe à vide destinée à être utilisée pendant la maintenance ou la mise en service d'un système cvc-r, adaptateur pour pompe à vide, et procédé de réalisation d'un test sous vide sur un système cvc-r

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