EP3271791A1 - A digital valve for mixing fluids - Google Patents

A digital valve for mixing fluids

Info

Publication number
EP3271791A1
EP3271791A1 EP16711227.5A EP16711227A EP3271791A1 EP 3271791 A1 EP3271791 A1 EP 3271791A1 EP 16711227 A EP16711227 A EP 16711227A EP 3271791 A1 EP3271791 A1 EP 3271791A1
Authority
EP
European Patent Office
Prior art keywords
flow
fluid
digital
actuator
digital 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Withdrawn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
EP16711227.5A
Other languages
German (de)
French (fr)
Inventor
Derrick Ernest Hilton
Colin HADEN
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Publication of EP3271791A1 publication Critical patent/EP3271791A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2086—Control of fluid pressure characterised by the use of electric means without direct action of electric energy on the controlling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/30—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers
    • F16K1/301—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers only shut-off valves, i.e. valves without additional means
    • F16K1/302—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces specially adapted for pressure containers only shut-off valves, i.e. valves without additional means with valve member and actuator on the same side of the seat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/135—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture
    • G05D11/138—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by sensing at least one property of the mixture by sensing the concentration of the mixture, e.g. measuring pH value

Definitions

  • the invention relates to the field of digital valves.
  • the invention is concerned with reducing the energy usage of such a device.
  • digital valves on gas cylinders.
  • the term digital valve encompasses at least manual valves with electronic sensors,
  • valves with or without sensors, and valves comprising locating and communication devices.
  • Such cylinders are used to supply gas for a range of
  • the various types of digital valve have in common the need for the devices (sensors, actuators, locating devices, and/or communication devices) to be powered electrically.
  • the present invention is concerned with digital valves powered by a store of charge on the device, such as a battery or capacitor.
  • Digital valves on cylinders require small batteries in order to keep the weight of the assembly (valve and cylinder) to a minimum, and the cylinders may be retained for a long time, in some cases in cold environments. There is therefore a technical pressure to conserve the charge of a battery.
  • Figure 1 depicts a schematic representation of a fluid mixing system in accordance with the invention
  • Figure 2 depicts a schematic representation of a gas
  • Figure 3 depicts a preferred digital valve for use in the system of Figure 1.
  • Figures 1 and 2 depict a first embodiment of apparatus for mixing fluids in accordance with the invention.
  • the apparatus comprises: a plurality of digital valves 110a, 110b, 110c, each mounted on respective cylinders 100a, 100b, 100c; a fluid analysis unit 200; a controller 300; and a mixer 400.
  • the cylinders 100a, 100b, 100c may store, for example, pressurised gases.
  • Each digital valve 110 may be installed on its respective cylinder 100 to thereby control the flow of fluid into and out of the cylinder 100.
  • the term digital valve assembly includes the digital valve 110 and may optionally also be considered to include the cylinder 100 when the digital valve 110 is mounted thereon.
  • the mixer 400 has a plurality of inputs 401, 402, each for receiving a flow of fluid from a plurality of digital valves 100.
  • the mixer 400 is arranged to mix the flow of fluid from each digital valve 100b, 100c connected thereto in order to produce a mixed output flow, provided via output 403.
  • the mixer 400 may comprise a chamber such as a plenum.
  • the fluid analysis unit 200 is arranged to monitor the composition of a flow of fluid therethrough.
  • the fluid analysis unit 200 may monitor the concentrations of one or more components of the flow.
  • the fluid analysis unit 200 is arranged downstream of the mixer 400 and
  • the fluid analysis unit 200 may receive a flow from a digital valve 110a directly, not via a mixer 400.
  • the fluid analysis unit 200 may receive a plurality of separate flows from different sources and monitor these separately.
  • the fluid analysis unit 200 may be provided with a target concentration and be configured to calculate an error between the actual concentrations and the target
  • the fluid analysis unit 200 may wirelessly receive the target concentration.
  • the fluid analysis unit 200 may wirelessly transmit a correction signal to one or more of the digital valves 110 when an error is identified between the actual concentration and the target concentration.
  • the correction signal may represent a target value of a parameter of the digital valve 110, or may represent a change of a parameter of the digital valve 110 (either option could be considered a correction signal) .
  • the fluid analysis unit 200 may be provided with a target flow rate and use this to determine whether to increase the provision of one component of a mixture or decrease the provision of another component or both in order to achieve a target flow rate and target concentration.
  • a controller 300 may be provided to transmit to the fluid analysis unit 200, preferably wirelessly, target data representing the target mixture concentration for the output flow.
  • the controller 300 may be a tablet computer or smart phone.
  • the target data may be entered into the controller 300 by a user via a user interface, or may be selected from one or more options stored on the controller 300, or
  • controller 300 accesses data from an external data source using the controller 300.
  • the controller 300 may be configured to transmit to the digital valves 110, preferably wirelessly, target data representing the target flow rate and/or target pressure for the corresponding cylinder 100 (or correction data representing adjustment of the flow rate and/or
  • the controller 300 only transmits to the fluid analysis unit 200, and it is the fluid analysis unit 200 that instructs the digital valves 110.
  • Each digital valve 110 is arranged to receive a correction signal, preferably wirelessly, from the fluid analysis unit 200.
  • Each digital valve 110 comprises an actuator 120 for
  • the actuator 120 may be an electromagnetic actuator such as a solenoid or motor.
  • the actuators 120 of the digital valves 110 preferably comprise an adjustable regulator for adjusting the pressure of the fluid leaving the cylinder 100.
  • the actuators 120 of the digital valves 110 preferably comprise a flow controller for adjusting the flow rate.
  • the flow controller may allow the mass flow of the fluid through the digital valve 110.
  • the flow controller may for example comprise a mass flow sensor.
  • Figure 3 shows an example of a suitable digital valve 110, which preferably comprises: a flow channel 116 from an inlet 112 to an outlet 113; a processor 111; a store of charge 115 (for example, a battery or capacitor) ; means for attachment to an external power supply; and an actuator 120.
  • the actuator 120 is used to adjust the pressure regulation function of a regulator 117.
  • the actuator 120 comprises a motor that can drive a linear gear that increases or
  • the actuator 120 may also comprise a flow controller (for example, a mass flow controller) for controlling the rate of flow of fluid along flow path 116.
  • a flow controller for example, a mass flow controller
  • the digital valve 110 is mounted on a cylinder 100 such that the inlet 112 is in communication with the cylinder 100.
  • the outlet 113 may be attached to external piping or tubing.
  • Each digital valve 110 is arranged to adjust the flow therethrough using the actuator 120 based on the received correction signal.
  • the actuator 120 comprises a regulator
  • the digital valve 110 is arranged to adjust the pressure of the flow therethrough using the actuator 120 based on the received correction signal
  • the actuator comprises a flow controller
  • the digital valve 110 is arranged to adjust the rate of the flow
  • the digital valve 110 periodically determines whether it is required to provide a command to control the actuator 120 to adjust the flow (irrespective of whether the actuator 120 is configured to adjust the rate and/or pressure of the flow) .
  • the adjustment of the actuator 120 comes at a cost in terms of the depletion of stored charge. It is therefore preferable, when the digital valve is powered by its store of charge, for the digital valve 110 to limit the use of the actuator 120 to provide a flow adjustment not more frequently than a maximum adjustment frequency (this corresponds to imposing a minimum period between subsequent uses of the actuator 120) .
  • the correction signal from the fluid analysis unit 200 could demand flow changes at a greater frequency than the maximum adjustment frequency of the digital valve 110. In which case, the digital valve will use the actuator 120 to adjust the flow at the maximum adjustment frequency.
  • the correction signal from the fluid analysis unit 200 could demand flow changes at a lesser frequency than the maximum adjustment frequency of the digital valve 110. In which case, the digital valve will use the actuator 120 to adjust the flow at the lesser frequency.
  • the digital valve 110 may be connectable to an external power supply 122. In which case, there is no longer a benefit in enforcing a maximum
  • Such a digital valve 110 may therefore be programmed to operate in a self-powered mode or an externally-powered mode.
  • Such a digital valve 110 will operate in the self-powered mode when powered by its store of charge, and will operate in the externally-powered mode when powered by an external power supply 122.
  • the digital valve 110 will limit the use of the actuator 120 to provide a flow adjustment not more frequently than a maximum adjustment frequency.
  • the digital valve 110 In externally-powered mode, the digital valve 110 will not limit the frequency of use of the actuator 120. The maximum frequency of use of the actuator 120 will therefore be set as the maximum achievable by the electronics (e.g., the clock speed of the digital valve 110) .
  • the digital valve 110 is arranged to sense whether it is attached to an external power supply 122 and to thereby automatically select the self-powered mode or the externally-powered mode.

Abstract

A valve apparatus for mixing fluids comprising a plurality of digital valves. Each valve has an actuator for adjusting the pressure and/or rate of flow of fluid from a cylinder storing fluid, a mixer for mixing the flow of fluid from each valve to produce an output flow, a fluid analysis unit arranged to monitor the composition of the output flow, and a controller arranged to provide a target mixture concentration for the output flow. The controller transmits target data to the fluid analysis unit, the fluid analysis unit receives the target data, to determine any error in the monitored composition, and sends a correction signal to one or more of the valves for adjusting the flow. Each of the valves is able to receive a correction signal and to adjust the flow using the actuator.

Description

A digital valve for mixing fluids
The invention relates to the field of digital valves.
Specifically, the invention is concerned with reducing the energy usage of such a device.
The provision of digital valves on gas cylinders is a recent development in the field. The term digital valve encompasses at least manual valves with electronic sensors,
electrically-actuated valves with or without sensors, and valves comprising locating and communication devices.
Although reference is made to a "cylinder", it will be understood that the invention is applicable broadly to all portable pressurised gas containers whether they are
strictly in the form of a cylinder or not.
Such cylinders are used to supply gas for a range of
applications including welding and cutting hoses and
torches, gas packaging machines and laboratory equipment.
The various types of digital valve have in common the need for the devices (sensors, actuators, locating devices, and/or communication devices) to be powered electrically. The present invention is concerned with digital valves powered by a store of charge on the device, such as a battery or capacitor.
Digital valves on cylinders require small batteries in order to keep the weight of the assembly (valve and cylinder) to a minimum, and the cylinders may be retained for a long time, in some cases in cold environments. There is therefore a technical pressure to conserve the charge of a battery.
Accordingly, there is provided apparatus and a digital valve assembly defined by the appended claims.
For a better understanding of the invention and to show how the same may be put into effect, reference is now made, by way of example only, to the accompanying drawings in which: Figure 1 depicts a schematic representation of a fluid mixing system in accordance with the invention;
Figure 2 depicts a schematic representation of a gas
cylinder for use in the system of Figure 1; and
Figure 3 depicts a preferred digital valve for use in the system of Figure 1.
Figures 1 and 2 depict a first embodiment of apparatus for mixing fluids in accordance with the invention. The apparatus comprises: a plurality of digital valves 110a, 110b, 110c, each mounted on respective cylinders 100a, 100b, 100c; a fluid analysis unit 200; a controller 300; and a mixer 400. The cylinders 100a, 100b, 100c may store, for example, pressurised gases. Each digital valve 110 may be installed on its respective cylinder 100 to thereby control the flow of fluid into and out of the cylinder 100. The term digital valve assembly includes the digital valve 110 and may optionally also be considered to include the cylinder 100 when the digital valve 110 is mounted thereon. The mixer 400 has a plurality of inputs 401, 402, each for receiving a flow of fluid from a plurality of digital valves 100. The mixer 400 is arranged to mix the flow of fluid from each digital valve 100b, 100c connected thereto in order to produce a mixed output flow, provided via output 403. The mixer 400 may comprise a chamber such as a plenum.
The fluid analysis unit 200 is arranged to monitor the composition of a flow of fluid therethrough. For example, the fluid analysis unit 200 may monitor the concentrations of one or more components of the flow. The fluid analysis unit 200 is arranged downstream of the mixer 400 and
receives therefrom a mixed flow of fluid. Optionally, the fluid analysis unit 200 may receive a flow from a digital valve 110a directly, not via a mixer 400.
Optionally, the fluid analysis unit 200 may receive a plurality of separate flows from different sources and monitor these separately.
The fluid analysis unit 200 may be provided with a target concentration and be configured to calculate an error between the actual concentrations and the target
concentrations. Preferably, the fluid analysis unit 200 may wirelessly receive the target concentration. Preferably, the fluid analysis unit 200 may wirelessly transmit a correction signal to one or more of the digital valves 110 when an error is identified between the actual concentration and the target concentration. The correction signal may represent a target value of a parameter of the digital valve 110, or may represent a change of a parameter of the digital valve 110 (either option could be considered a correction signal) . For example, the fluid analysis unit 200 may be provided with a target flow rate and use this to determine whether to increase the provision of one component of a mixture or decrease the provision of another component or both in order to achieve a target flow rate and target concentration.
A controller 300 may be provided to transmit to the fluid analysis unit 200, preferably wirelessly, target data representing the target mixture concentration for the output flow. The controller 300 may be a tablet computer or smart phone. The target data may be entered into the controller 300 by a user via a user interface, or may be selected from one or more options stored on the controller 300, or
accessed from an external data source using the controller 300.
In some embodiments, the controller 300 may be configured to transmit to the digital valves 110, preferably wirelessly, target data representing the target flow rate and/or target pressure for the corresponding cylinder 100 (or correction data representing adjustment of the flow rate and/or
pressure) . However, in more preferred embodiments, the controller 300 only transmits to the fluid analysis unit 200, and it is the fluid analysis unit 200 that instructs the digital valves 110.
Each digital valve 110 is arranged to receive a correction signal, preferably wirelessly, from the fluid analysis unit 200. Each digital valve 110 comprises an actuator 120 for
adjusting the pressure and/or rate of flow of fluid from a cylinder 100 storing fluid. The actuator 120 may be an electromagnetic actuator such as a solenoid or motor.
The actuators 120 of the digital valves 110 preferably comprise an adjustable regulator for adjusting the pressure of the fluid leaving the cylinder 100. Alternatively, or additionally, the actuators 120 of the digital valves 110 preferably comprise a flow controller for adjusting the flow rate.
For example, the flow controller may allow the mass flow of the fluid through the digital valve 110. The flow controller may for example comprise a mass flow sensor.
Figure 3 shows an example of a suitable digital valve 110, which preferably comprises: a flow channel 116 from an inlet 112 to an outlet 113; a processor 111; a store of charge 115 (for example, a battery or capacitor) ; means for attachment to an external power supply; and an actuator 120.
In the example of Figure 3, the actuator 120 is used to adjust the pressure regulation function of a regulator 117. Specifically, in this example, the actuator 120 comprises a motor that can drive a linear gear that increases or
decreases the compression of a spring against a membrane to vary the pressure of a fluid flowing along the flow channel 116. Alternatively, or additionally, the actuator 120 may also comprise a flow controller (for example, a mass flow controller) for controlling the rate of flow of fluid along flow path 116.
In a digital valve assembly, the digital valve 110 is mounted on a cylinder 100 such that the inlet 112 is in communication with the cylinder 100.
The outlet 113 may be attached to external piping or tubing. Each digital valve 110 is arranged to adjust the flow therethrough using the actuator 120 based on the received correction signal. For example, when the actuator 120 comprises a regulator, the digital valve 110 is arranged to adjust the pressure of the flow therethrough using the actuator 120 based on the received correction signal and when the actuator comprises a flow controller, the digital valve 110 is arranged to adjust the rate of the flow
therethrough using the actuator 120 based on the received correction signal.
In preferred embodiments, the digital valve 110 periodically determines whether it is required to provide a command to control the actuator 120 to adjust the flow (irrespective of whether the actuator 120 is configured to adjust the rate and/or pressure of the flow) . Of course, the adjustment of the actuator 120 comes at a cost in terms of the depletion of stored charge. It is therefore preferable, when the digital valve is powered by its store of charge, for the digital valve 110 to limit the use of the actuator 120 to provide a flow adjustment not more frequently than a maximum adjustment frequency (this corresponds to imposing a minimum period between subsequent uses of the actuator 120) . For example, the correction signal from the fluid analysis unit 200 could demand flow changes at a greater frequency than the maximum adjustment frequency of the digital valve 110. In which case, the digital valve will use the actuator 120 to adjust the flow at the maximum adjustment frequency.
In another example, the correction signal from the fluid analysis unit 200 could demand flow changes at a lesser frequency than the maximum adjustment frequency of the digital valve 110. In which case, the digital valve will use the actuator 120 to adjust the flow at the lesser frequency.
In preferred embodiments, the digital valve 110 may be connectable to an external power supply 122. In which case, there is no longer a benefit in enforcing a maximum
adjustment frequency. Such a digital valve 110 may therefore be programmed to operate in a self-powered mode or an externally-powered mode.
Such a digital valve 110 will operate in the self-powered mode when powered by its store of charge, and will operate in the externally-powered mode when powered by an external power supply 122.
In the manner set out above, in the self-powered mode, the digital valve 110 will limit the use of the actuator 120 to provide a flow adjustment not more frequently than a maximum adjustment frequency.
In externally-powered mode, the digital valve 110 will not limit the frequency of use of the actuator 120. The maximum frequency of use of the actuator 120 will therefore be set as the maximum achievable by the electronics (e.g., the clock speed of the digital valve 110) . Preferably, the digital valve 110 is arranged to sense whether it is attached to an external power supply 122 and to thereby automatically select the self-powered mode or the externally-powered mode.

Claims

CLAIMS :
1. Apparatus for mixing fluids, comprising:
a plurality of digital valves, each comprising an actuator for adjusting the pressure and/or rate of flow of fluid from a cylinder storing fluid;
a mixer for mixing the flow of fluid from each digital valve to produce an output flow;
a fluid analysis unit arranged to monitor the
composition of the output flow; and
a controller arranged to provide a target mixture concentration for the output flow,
wherein :
the controller is arranged to transmit target data to the fluid analysis unit, the target data indicating the target mixture concentration;
the fluid analysis unit is arranged receive the target data, to determine any error in the monitored composition, and to send a correction signal to at least one of the digital valves for adjusting the flow; and
each of the plurality of digital valves is arranged to receive a correction signal, and to adjust the flow
therethrough using the actuator based on the received correction signal.
2. Apparatus according to claim 1, wherein:
each digital valve comprises a store of charge and means for attachment to an external power supply;
each digital valve is arranged to make adjustments to the flow in dependence upon the correction signal at no more than a maximum adjustment frequency; the digital valve is programmed to operate in a self- powered mode or an externally-powered mode; and
the maximum adjustment frequency is lower in the self- powered mode than in the externally-powered mode.
3. Apparatus according to claim 2, wherein each digital valve is arranged to sense whether it is attached to an external power supply and to thereby automatically select the self-powered mode or the externally-powered mode.
4. Apparatus according to any preceding claim, further comprising a buffer arranged to receive a flow of fluid from each of the flow controllers, to mix the flows of fluid, and to provide an output flow of mixed fluid.
5. Apparatus according to any preceding claim, wherein: the a controller is arranged to wirelessly transmit a target mixture concentration for the output flow; and
the fluid analysis unit is arranged to wirelessly transmit a correction signal to at least one of the digital valves for correcting the flow.
6. Apparatus according to any preceding claim, wherein the actuator of at least one of the digital valves comprises a flow controller for adjusting the flow rate.
7. Apparatus according to any preceding claim, wherein the actuator of at least one of the digital valves comprises an adjustable regulator for adjusting the flow pressure.
8. A digital valve assembly for a cylinder containing compressed fluid, the valve assembly comprising: a flow channel from an inlet for communication with the cylinder to an outlet for attachment to external piping or tubing;
an actuator for adjusting the pressure and/or rate of flow of fluid along the flow channel;
a processor arranged to send instructions to the actuator at no more than a maximum adjustment frequency; a store of charge; and
means for attachment to an external power supply, wherein:
the digital valve is programmed to operate in a self- powered mode or an externally-powered mode; and
the maximum adjustment frequency is lower in the self- powered mode than in the externally-powered mode.
9. The digital valve of claim 8, wherein the actuator of at least one of the digital valves comprises a flow controller for adjusting the flow rate.
10. The digital valve of claim 8 or claim 9, wherein the actuator of at least one of the digital valves comprises an adjustable regulator for adjusting the flow pressure.
EP16711227.5A 2015-03-17 2016-03-17 A digital valve for mixing fluids Withdrawn EP3271791A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB201504443A GB201504443D0 (en) 2015-03-17 2015-03-17 A digital valve for mixing fluids
PCT/EP2016/055800 WO2016146742A1 (en) 2015-03-17 2016-03-17 A digital valve for mixing fluids

Publications (1)

Publication Number Publication Date
EP3271791A1 true EP3271791A1 (en) 2018-01-24

Family

ID=53016223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16711227.5A Withdrawn EP3271791A1 (en) 2015-03-17 2016-03-17 A digital valve for mixing fluids

Country Status (3)

Country Link
EP (1) EP3271791A1 (en)
GB (1) GB201504443D0 (en)
WO (1) WO2016146742A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11906067B2 (en) 2022-01-21 2024-02-20 Hamilton Sundstrand Corporation Active valve shimming

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA912658B (en) * 1990-04-11 1993-01-27 Transfresh Corp Monitor-control systems and methods for monitoring and controlling atmospheres and containers for respiring perishables
EP2667276B1 (en) * 2012-05-24 2017-11-08 Air Products And Chemicals, Inc. Method of, and apparatus for, providing a gas mixture

Also Published As

Publication number Publication date
WO2016146742A1 (en) 2016-09-22
GB201504443D0 (en) 2015-04-29

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