NL2027613B1 - Low pressure degassing device - Google Patents

Low pressure degassing device Download PDF

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Publication number
NL2027613B1
NL2027613B1 NL2027613A NL2027613A NL2027613B1 NL 2027613 B1 NL2027613 B1 NL 2027613B1 NL 2027613 A NL2027613 A NL 2027613A NL 2027613 A NL2027613 A NL 2027613A NL 2027613 B1 NL2027613 B1 NL 2027613B1
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NL
Netherlands
Prior art keywords
degassing
main flow
piston
valve
pressure
Prior art date
Application number
NL2027613A
Other languages
Dutch (nl)
Inventor
Henk Cnossen Jan
Original Assignee
Flamco Bv
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Filing date
Publication date
Application filed by Flamco Bv filed Critical Flamco Bv
Priority to NL2027613A priority Critical patent/NL2027613B1/en
Priority to US18/277,406 priority patent/US20240123373A1/en
Priority to EP22707163.6A priority patent/EP4294543A1/en
Priority to PCT/EP2022/054447 priority patent/WO2022175560A1/en
Priority to CA3209201A priority patent/CA3209201A1/en
Application granted granted Critical
Publication of NL2027613B1 publication Critical patent/NL2027613B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0036—Flash degasification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0063—Regulation, control including valves and floats
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/08—Arrangements for drainage, venting or aerating
    • F24D19/082—Arrangements for drainage, venting or aerating for water heating systems
    • F24D19/083—Venting arrangements
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/03—Pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Degasification And Air Bubble Elimination (AREA)

Abstract

The invention relates to a degassing device for degassing a gas-containing liquid in a cooling or heating installation, the degassing device comprising: 5 - a main flow channel defined by a tube, wherein in operation a main flow of liquid flows through the main flow channel, - a branch flow passage extending between the main flow channel and a degasification zone, the branch flow passage being configured to branch off a branch flow being a portion of the main flow, 10 - a return flow passage extending between the degasification zone and the main flow channeL - a degasification housing defining an inner volume, wherein the inner volume substantially corresponds to the degasification zone, - at least one valve, wherein in a closed position the at least one valve obstructs the 15 branch flow passage, and/or wherein in the closed position the at least one valve obstructs the return flow passage and closes off the degasification zone from the main flow channel, - a pressure reduction device connected to the degasification housing, wherein during operation, the pressure reduction device is configured to lower the pressure in the 20 degasification zone relative to the pressure in the main flow channel, - a gas outlet in the degasification housing, wherein an outlet tube is closeable by an outlet closing body, wherein the gas outlet, the first valve and the second valve are configured to close the degasification housing and wherein the pressure reduction device is 25 configured to degas the gas-containing liquid.

Description

P34946NL0O0/WHA2 Title: Low pressure degassing device
FIELD OF THE INVENTION The invention relates to the field of degassing a gas-containing liquid in a cooling or heating installation and in particular to a device and a method for degassing the liquid.
BACKGROUND OF THE INVENTION In the field of degassing liquids, various devices and methods exist.
US2011214571A1 discloses a degassing device that makes use of a vacuum chamber to locally reduce pressure in order to separate gasses from a liquid. The device comprises a channel through which the liquid flows, wherein the liquid also passes through a vacuum chamber. In this vacuum chamber, the main flow channel is delimited by a permeable region through which gasses may pass but the liquid may not.
Outside of this permeable region, an enclosure is located to which a vacuum pump is connected. This vacuum pump has been configured to create a continuous vacuum level in the enclosure in order for the liquid to degas. Further, a vent is connected to the enclosure to permit a venting flow to enter the vacuum chamber to reduce condensation within the enclosure.
It has been recognized that such a device presents several drawbacks. The use of a permeable region allows a certain amount of liquid to migrate into the enclosure causing contamination of the enclosure, and therewith contamination of the vacuum pump, and over time may reduce the amount of liquid in the main flow channel. Further, over time, the permeable region will also degrade due to a build-up of contaminants. This build-up prevents gas passing through, ultimately leading to degassing no longer being possible.
Also, because a continuous vacuum is required to operate the device, the device will likely consume a lot of energy. Further, a vent that feeds gas from the outside to the enclosure will only lead to the vacuum pump needing to work harder to maintain the desired vacuum level and consuming even more energy.
Additionally, a vacuum pump makes a lot of noise and a continuously operating pump even more so. This makes is less suitable for domestic applications.
EP3764001A1 discloses a device wherein a portion of a main flow is branched off through a bypass, flows through a venturi device and enters a degassing chamber. On another side of the degassing chamber, the branched off portion is returned to the main flow.
Additionally, a degassing conduit leads from a suction area to the bypass and joins the bypass in the venturi device. In this degassing conduit the pressure is lower than in the rest of the circuit because of the venturi device. The lower pressure causes the dissolved gasses to separate and the gases can then be evacuated through a ventilator in the degassing chamber.
A drawback of the device is that the liquid in the circuit must always be moving at a certain velocity to make the venturi device work by creating a pressure difference between the return flow and the branch flow. If the velocity is not sufficient an extra pump is needed to create the pressure difference. This results in either a not optimally working device or in an expensive device due to the need of an extra pump. Such a pump would also increase the energy consumption of the device.
Additionally, because the system is dependent on the velocity of the liquid in the circuit it may be difficult to control the pressures in the system and therewith the degassing process.
OBJECT OF THE INVENTION It is an object of the invention to provide a device and a method for degassing a liquid and, in doing so, overcoming at least one of the abovementioned drawbacks.
SUMMARY OF THE INVENTION In order to achieve the object, the present invention provides a degassing device for degassing a gas-containing liquid in a cooling or heating installation, the degassing device comprising: - a main flow channel defined by a tube extending between a first side and a second side, wherein in operation a main flow of liquid flows through the main flow channel, - at least one flow passage extending between the main flow channel and the degasification zone, the flow passage being configured to allow communication between the degasification zone and the main flow channel, - a degasification housing defining an inner volume, wherein the inner volume substantially corresponds to the degasification zone,
- at least one valve which is moveable between a closed position and an open position, wherein in the closed position the valve obstructs the flow passage and closes off the degasification zone from the main flow channel and wherein in the open position the valve does not obstruct the flow passage, - a pressure reduction device connected to the degasification housing, wherein during operation, the pressure reduction device is configured to lower the pressure in the degasification zone relative to the pressure in the main flow channel.
- a gas outlet in the degasification housing, the gas outlet comprising an outlet tube and an outlet closing body, wherein the outlet tube is closeable by the outlet closing body, wherein the gas outlet and the at least one valve are configured to close the degasification housing and wherein the pressure reduction device is configured to degas the gas-containing liquid.
In an embodiment, the device comprises two flow passages, a first flow passage being a branch flow passage, the branch flow passage being configured to branch off a branch flow being a portion of the main flow, and a second flow passage being a return flow passage extending between the degasification zone and the main flow channel, the return flow channel being configured to return a return flow to the main flow.
By branching of a portion of a main flow of the cooling or heating installation and by obstructing the branch flow passage and/or the return flow passage, the pressure reduction device can reduce the pressure to which the branched off portion, i.e. the branch flow, is subjected. When the pressure is reduced to a level below the pressure inside the main flow channel, gasses that are dissolved in the liquid will become less soluble and will separate from the liquid. The gasses that have been separated from the liquid can then be removed from the degassing device before the liquid joins the main flow. In doing so, the amount of dissolved gasses in the liquid in the cooling or heating installation can be reduced.
In an embodiment, the degassing device may comprise a first valve which is moveable between a closed position and an open position, wherein in the closed position the first valve obstructs the branch flow passage and closes off the degasification zone from the main flow channel. A second valve which is moveable between a closed position and an open position may be used to obstruct the return flow passage to close off the degasification zone from the main flow channel.
By using two separate valves to be able to close off the branch flow passage and the return flow passage, the two valves may be placed at a distance from each other along the main flow. In doing so, the renewal of liquid in the degasification housing may be increased.
In an embodiment, the pressure reduction device is connected to the degasification housing and the pressure reduction device comprises a piston, a cylinder, and a piston actuator. The piston is moveable between an idle pressure position and a low pressure position and is in open communication with the inner volume. In the low pressure position of the piston the degasification zone extends into the cylinder and is larger than in the idle pressure position of the piston. Herein, the degasification zone is delimited by the degasification housing, and at least part of an outer surface of the piston and/or by at least a part of the inner surface of the cylinder. The piston actuator may be one of a mechanical actuator, electrical actuator, magnetic actuator, hydraulic actuator, and pneumatic actuator.
By moving the piston from the idle pressure position to the low pressure position, the degasification zone is pulled into the cylinder and becomes larger than in the idle pressure position of the housing. Because the volume of the degasification zone increases while the content of the degasification zone, i.e. the amount of liquid inside the degasification zone, remains substantially the same, the pressure to which the liquid in the degasification zone is subjected is reduced. The reduced pressure causes the liquid to degas.
In an embodiment, a retracted position of the piston corresponds to the low pressure position and an extended position of the piston corresponds to the idle pressure position. Alternatively, the extended position of the piston corresponds to the low pressure position and the retracted position of the piston corresponds to the idle pressure position.
In the first case, the piston actuator will pull on the piston to move the piston to the low pressure position and in the second case, the piston actuator will push on the piston to move the piston to the low pressure position.
In an embodiment, the piston actuator is fixed to the degasification housing via one or more resilient members and the piston actuator is resiliently moveable between a first actuator position and a second actuator position.
The piston actuator may be fixed to the degasification housing via the one or more resilient member in order to be able to absorb mechanical vibrations.
In an embodiment, the piston is at least partially moveable within the cylinder.
In an embodiment, the piston is moveable in a direction that is substantially parallel to the main flow channel. By positioning the pressure reduction device in an orientation that allows 5 the piston to move in a direction substantially parallel to the main flow channel, an efficient use of space can be achieved. Because the direction is substantially parallel to the main flow channel, the space occupied by the degassing device in a direction away from the main flow channel can be reduced.
In an embodiment, the piston is moveable in a direction that is substantially orthogonal to the main flow channel. By positioning the pressure reduction device in an orientation that allows the piston to move in a direction substantially orthogonal to the main flow channel, an another efficient use of space can be achieved. Because the direction is substantially orthogonal to the main flow channel, the space occupied by the degassing device in a direction along the main flow channel can be reduced.
In an embodiment, the piston is in direct contact with the liquid and preferably no membrane is present between the piston and the degasification zone. Because no membrane is present, the device becomes more robust and may require less maintenance. The absence of a membrane means that there is one less part that can malfunction and that there is no membrane that may clog, inhibiting the working of the device. Because the piston may directly act on the liquid without first having to deform an elastic member such as a membrane, a pressure reduction can be achieved faster.
In an embodiment, the piston comprises at least one seal, in particular two seals located at a distance from each other, in particular the seals being O-rings, more in particular the seals being double lip seals. Such seals may be used to increase the performance of the pressure reduction device by increasing sealing capabilities and therefore loss of pressure difference.
In an embodiment, the pressure reduction device is located in a lower part of the degasification housing and the pressure reduction device is configured to be operated below a liquid level in the degasification housing.
By being able to place the pressure reduction device in a lower part of the degasification housing and the pressure reduction device being configured to be operated below the liquid level, the pressure reduction device can be positioned close to the main flow channel. This may reduce the amount of space taken up by the degassing device.
In an embodiment, the branch flow passage extends through the cylinder between the main flow channel and the degasification zone and the piston movement is configured to move the first valve to the closed state. In doing so, in a single operation of the piston can be used to close off the branch flow passage and reduce the pressure inside the degasification zone. Thereby, no additional actuator is needed to move the first valve to the closed state. In an embodiment, a cavity is located in the cylinder and between the main flow channel and the piston, wherein a branch flow path extends through the cavity.
In an embodiment, the cylinder defines a branch flow hole, wherein the branch flow path extends through the branch flow passage, through the cavity and through the branch flow hole into the inner volume.
In an embodiment, the branch flow passage is defined by the cylinder, the branch flow hole and the piston.
In an embodiment, the first valve is integrated in the pressure reduction device, in particular in the piston, wherein the piston comprises a part which obstructs the branch flow path in the low pressure position. The movement of the piston to the low pressure position herein also closes of the branch flow passage. This does not only result in one less actuator to close of the branch flow passage, but also requires one moving part less, potentially reducing necessary maintenance.
In an embodiment, the second valve is a non-return valve. In such an embodiment, when the pressure is reduced by the pressure reduction device, the relatively higher pressure in the main flow channel forces the second non-return valve to the closed state. In doing so, no actuator may be necessary to close off the valve.
In an embodiment, the gas outlet further comprises a floater chamber and the outlet closing body comprises a floater moveable between a floating position and a lower position at a first predetermined liquid level. When at first a liquid is at a level where the floater is in a floating position and the liquid level starts to drop as a result of the operation of the pressure reduction device, the floater moves downwards to the lower position where it engages an end of the outlet tube and closes off the outlet tube. Not only does the floater replace the need for an actively operated gas outlet valve, by closing off the outlet tube as soon as the liquid has flown out of the outlet tube, the floater reduces the amount of free gas inside the degasification zone. This, in turn, facilitates the reduction of pressure and may increase the amount of gas that can be separated from the gas-containing liquid.
In an embodiment, the gas outlet comprises a gas outlet valve that allows gas and/or liquid to flow between the outside and the degasification zone in an open state, and closes off the degasification zone in a closed position, in particular the gas outlet valve being a ball valve. In doing so the entire degasification zone can be filled with liquid and the degassing of the liquid can be performed more efficiently than in a situation where more liquid and/or mare gas would initially be present, because the pressure reduction can be attained more easily and faster.
In an embodiment, the floater chamber comprises a float valve defining a gas outlet opening and when a liquid level is higher than a second predetermined level, the outlet closing body is moved to an upper position closing the float valve. In doing so, when an amount of liquid flowing into the degasification housing risks overflowing the degasification housing, the gas outlet opening is closed off by the floater inhibiting the liquid to spill out of the degassing device. Thereafter, the liquid will either stop flowing in through the branch flow passage or will enter through the branch flow passage and will flow out through the return flow passage.
In an embodiment, the floater comprises a protrusion located on a lower side of the floater and an outer dimension of the protrusion substantially matches an inner dimension of the outlet tube. Such a protrusion may increase the sealing capabilities of the floater.
In an embodiment, the float valve comprises a backflow preventer configured to allow gas to escape but not to enter the gas outlet, in particular the backflow preventer being a non- return valve. When the pressure reduction device is operated, the backflow preventer prevents more particles to be sucked into the degasification zone. In doing so, a volume increase more effectively and efficiently lowers the pressure because no particles can be added to the volume.
In an embodiment, the floater comprises an O-ring to close off the outlet tube in the lower position and/or an O-ring to close off the gas outlet in the upper position.
In an embodiment, the degassing device further comprises a vacuum pump connected to the gas outlet and a porous chamber located within the inner volume of the degasification housing, wherein the branch flow passage branches off part of the main flow into the porous chamber and the return flow passage extends between the porous chamber and the main flow channel. The porous chamber may comprise a porous element that is permeable to gases and impermeable to the liquid.
By using the combination of the vacuum pump and the porous chamber, the gas outlet does not need to be closed off by a floater, because the vacuum pump functions as a non- return valve for the separated gases. Also, because the porous element is impermeable to the liquid, there is little risk of the liquid reaching the vacuum pump, which would be detrimental to its operation. In an embodiment, the main flow channel is constricted between the first side and the second side. Such a constriction may increase the pressure near the branch flow passage, forcing a portion of the main flow into the degasification housing. The main flow channel may also comprise a branch flow separator protruding into the main flow channel configured to branch off a portion of the main flow into the degasification zone. The main flow channel may also comprise a main flow valve configured to branch off a portion of the main flow into the degasification zone In an embodiment, the degassing device further comprises a biased switch wherein in the first piston actuator position, the piston actuator engages the biased switch and in the second actuator position, the switch is disengaged.
When the piston actuator is operated to move the piston to the low pressure position, a maximum underpressure risks to be exceeded. When this is about to happen, the low pressure pulls the piston, and therewith the piston actuator, away from the switch towards the second actuator position, disengaging the switch. The disengagement of the switch may deactivate the operation of the piston actuator, inhibiting a further reduction of pressure.
In an embodiment, the degassing device further comprises at least one sensor and a control unit configured to read out the at least one sensor and/or to control the pressure reduction device. In doing so, the pressure inside the degasification housing can be monitored and controlled if necessary.
In an embodiment, a first pressure sensor is located in the main flow channel and a second pressure sensor is located in the degasification zone. The control unit may then be configured to operate the pressure reduction device as a function of an output of the first pressure sensor and/or the second pressure sensor. By measuring the pressure both in the main flow channel and in the degasification zone, the pressure difference between the two can be determined.
In an embodiment, the pressure reduction device comprises the sensor configured to measure a pressure in the degasification zone.
In an embodiment, at least one sensor is a strain gauge or a stress gauge. By connecting the strain gauge or stress gauge to the piston or piston actuator, the force acting on the piston or piston actuator can be determined and can be used to determine the pressure in the degasification housing.
In an embodiment, at least one sensor is a current measurement device configured to determine the current necessary to move the piston. By determining the current needed to move the piston, the pressure inside the degasification housing may also be determined as a function of the force necessary to move the piston.
In an embodiment, the degassing device further comprises a temperature sensor. The temperature sensor may be located in the main flow channel.
Another aspect of the invention relates to a method for degassing a gas-containing liquid in a cooling or heating installation by using a degassing device, the degassing device comprising: - a main flow channel wherein a main flow of liquid flows through the main flow channel, - at least one flow passage extending between the main flow channel and a degasification zone, - a degasification housing defining an inner volume, wherein the inner volume substantially corresponds to the degasification zone, - at least one valve which is moveable between a closed position and an open position, - a pressure reduction device connected to the degasification housing, a gas outlet in the degasification housing, the gas outlet comprising an outlet tube and an outlet closing body, wherein the outlet tube is closeable by the outlet closing body, wherein the method comprises the steps: a) branching off a portion of the main flow through the branch flow passage, b) moving the first valve and the second valve to their respective closed positions, respectively obstructing the branch flow passage and the return flow passage, closing off the degasification zone from the main flow channel, and closing the gas outlet,
c) operating the pressure reduction device to lower the pressure in the degasification zone relative to the pressure in the main flow channel, d) opening the at least one valve, and the gas outlet, wherein during step ¢) gas dissolved in the liquid is separated from the liquid and wherein during and/or after step d) liquid in the degasification housing is returned to the main flow channel through the return flow passage and the separated gas is expelled through the gas outlet. In an embodiment, the degassing device comprises two flow passages, a first flow passage being a branch flow passage, and a second flow passage being a return flow passage.
In an embodiment, the pressure reduction device is connected to the degasification housing and wherein the pressure reduction device comprises a piston, a cylinder, and a piston actuator. Herein, the cylinder may be in open communication with the inner volume, and during step c) the piston is moved between an extended position and a retracted position. wherein the degasification zone is delimited by the degasification housing and the piston.
In the retracted position of the piston the degasification zone extends into the cylinder and is larger than in the extended position of the piston. Herein, the degasification zone is delimited by the degasification housing, and at least part of an outer surface of the piston and/or by at least a part of the inner surface of the cylinder.
By moving the piston from the extended position to the retracted position, the degasification zone is pulled into the cylinder and becomes larger than in the idle pressure position of the housing. Because the volume of the degasification zone increases while the content of the degasification zone, i.e. the amount of liquid inside the degasification zone, remains substantially the same, the pressure to which the liquid in the degasification zone is subjected is reduced. The reduced pressure causes the liquid to degas.
In an embodiment, the degasification zone is enlarged into the cylinder when the piston is moved from the extended position to the retracted position and the degasification zone is larger in the retracted position than in the extended position. Alternatively, the degasification zone is enlarged into the cylinder when the piston is moved from the retracted position to the extended position and the degasification zone is larger in the extended position than in the retracted position.
In the first case, the piston actuator will pull on the piston to move the piston to the low pressure position and in the second case, the piston actuator will push of the piston to move the piston to the low pressure position.
In an embodiment, the branch flow passage extends through the cylinder between the main flow channel and the degasification zone and wherein step b) and step ¢) occur substantially simultaneous and wherein the moving of the piston moves at least one of the first valve, the second valve to the closed position, and/or closes the gas outlet.
In an embodiment, the outlet closing body comprises a floater and when a liquid level is lower than a first predetermined level, the floater is moved to a lower position, closing off the outlet tube.
In an embodiment, the gas outlet further defines a gas outlet opening and wherein when aliquid level is at a second predetermined level, the outlet closing body is moved to an upper position, closing off the gas outlet opening.
In an embodiment, the gas outlet further comprises a float valve and when a liquid level is at the second predetermined level, the float valve closes off the gas outlet opening.
In an embodiment, the floater comprises a protrusion, and an outer dimension of the protrusion substantially matches an inner dimension of the outlet tube and wherein during step b) the protrusion is forced into the outlet tube.
In an embodiment, the floater comprises a backflow preventer. The backflow preventer preventing gas to flow into the degasification zone when an outside pressure is larger than a pressure inside the degasification housing.
In an embodiment, the floater comprises a second protrusion, and an outer dimension of the second protrusion substantially matches an inner dimension of the gas outlet opening and wherein when the liquid level is at the second predetermined level, the protrusion is forced into the outlet tube.
In an embodiment, the main flow channel is constricted between the first side and the second side and the constriction increases pressure near the branch flow passage and forces at least a portion of the main flow into the degasification housing. The main flow channel may also comprise a branch flow separator that branches off at least a portion of the main flow into the degasification zone. The main flow channel may also comprise a main flow valve configured to branch off a portion of the main flow into the degasification zone. In doing so, the renewal of liquid in the degasification zone may be increased.
In an embodiment, prior to step d), the pressure in the degasification zone is increased to substantially the pressure present during step a). This reduces pressure differences between the main flow channel and the degasification housing, and/or pressure differences between the outside and the degasification housing. This facilitates the operation of the gas outlet and the valve configured to close off the branch flow passage and the valve configured to close off the return flow passage.
In an embodiment, the degassing device further comprises a biased switch and the piston actuator is fixed to the degasification housing via one or more resilient members and the piston actuator is resiliently moveable between a first actuator position and a second actuator position. When a force necessary to move the piston to the retracted position exceeds a predetermined value corresponding to a minimum pressure inside the degasification housing, the force moves the actuator from the first actuator position engaging the biased switch to the second actuator position disengaging the switch, wherein the disengagement of the switch interrupts the operation of the pressure difference device. In doing so, for example, a predetermined minimum pressure or maximum underpressure can be ensured to remain above the vapour line of the liquid, preventing the liquid from boiling.
In an embodiment, wherein the degassing device further comprises at least one sensor and a control unit, wherein the control unit reads out the at least one sensor and/or controls the pressure reduction device. In doing so, the pressure inside the degasification housing can be monitored and controlled if necessary.
In an embodiment, the sensor is a force sensor connected to the piston actuator and the degasification housing, wherein the sensor measure a force acting on the piston actuator in a direction substantially parallel to a central axis of the cylinder. By connecting the force sensor to the piston actuator, the force acting on the piston actuator can be determined and can be used to determine the pressure in the degasification housing.
In an embodiment, a first pressure sensor is located in the main flow channel and wherein a second pressure sensor is located in the degasification zone.
In an embodiment, the degassing device further comprises a temperature sensor. The temperature sensor may be located in the main flow channel.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 depicts an embodiment of the degassing device in an idle state. Figure 2 depicts an embodiment of the degassing device in a state wherein the pressure reduction device has just started operation. Figure 3 depicts an embodiment of the degassing device in a low pressure state. Figure 4 depicts an embodiment of the degassing device after dissolved gas has been separated from the liquid and is being evacuated to outside of the degassing device. Figure 5 depicts an embodiment comprising a floater chamber, sensors and a control unit in an idle state. Figure 6 depicts an embodiment comprising a floater chamber, sensors and a control unit in an low pressure state. Figure 7 depicts an embodiment comprising a floater chamber, sensors and a control unit in an overpressure state. Figure 8 depicts an embodiment of the degassing device, wherein valves are controlled by the control unit in an idle state. Figure 9 depicts an embodiment of the degassing device, wherein valves are controlled by the control unit in a low pressure state. Figure 10 depicts an embodiment of the degassing device, wherein valves are controlled by the control unit in an idle state. Figure 11 depicts an embodiment of the degassing device, wherein valves are controlled by the control unit in a low pressure state. Figure 12 depicts an embodiment wherein the piston movement is oriented orthogonally to the main flow channel is an idle state. Figure 13 depicts an embodiment wherein the piston movement is oriented orthogonally to the main flow channel is a low pressure state. Figures 14A and 14B depict an embodiment of the piston actuator Figure 15 depicts an embodiment of the degassing device comprising a porous chamber and a vacuum pump. Figure 16 depicts an embodiment with one flow passage, wherein the degassing device is in an idle pressure position. Figure 17 depicts an embodiment with one flow passage, wherein the degassing device is in a low pressure position.
DETAILED DESCRIPTION OF THE DRAWINGS Turning to figures 1-4, a cross section of an embodiment of a degassing device 10 is depicted. The degassing device 10 is connected to a liquid circuit of a cooling or heating installation (not depicted) wherein a liquid of the cooling or heating installation enters the degassing device 10 on a first side 22 and exits the degassing device on a second side 24. In operation, a main portion of the liquid flow passes through a main flow channel 20 and a branch flow is branched off by a branch flow passage 30. After being branched off, the flow passes through the branch flow passage into a degasification zone 42 where the liquid will be degassed. The degasification zone 42 substantially corresponds to an inner volume of a degasification housing 40. In an idle state of the degassing device, the liquid first passes through the branch flow passage 30 and the degasification zone 42, after which the liquid joins the main flow via a return flow passage 50 extending between the degasification zone and the main flow channel.
A pressure reduction device 70 is connected to the degasification housing 40 and is configured to lower the pressure in the degasification zone 42 relative to the pressure in the main flow channel. The pressure can be measured with a sensor 92, in particular with a manometer.
In order to be able to degas the liquid in the degasification zone, the degasification housing must be closed off from the outside, i.e. from the atmosphere outside the degassing device and from the main flow channel. To do so, a valve 60B is present that is moveable between a closed position 62B and an open position 64B. In the closed position the valve obstructs the return flow passage 50 and closes off the degasification zone from the main flow channel. Another valve 60A is present and is configured to be moved between a closed position 62B and an open position 64B and obstructs the branch flow passage in the closed position, closing off the degasification zone 42 from the main flow channel 20.
After the degassing of the liquid has taken place, the separate gas must be evacuated from the device. To this end, a gas outlet 80 is present in the degasification housing and comprises an outlet tube 82 and an outlet closing body 84.
In the depicted embodiment, the pressure reduction device 70 comprises a piston 72, a cylinder 74 and a piston actuator 76. The piston actuator 76 is configured to move the piston 72 between an extended, idle pressure position 722 and a retracted, low pressure position 724. Because the cylinder is in open communication with the degasification zone 42 and the degasification zone 42 extends into the cylinder and is larger in the retracted position 725 than in the extended position 723 of the piston, the movement of the piston from the extended positon 722 to the retracted position 724 reduces the pressure inside the degasification zone 42: the closed off degasification zone grows in size whilst the amount of matter inside it remains substantially the same. The degasification zone 42 is delimited by the degasification housing 40, a part of the outer surface of the piston 72, and a part of the inner surface of the cylinder
74. It will be understood that if the piston actuator would be located on an opposite side of the piston 72 along the direction of movement of the piston, the low pressure position would correspond to an extended position and the idle pressure position would correspond to a retracted position because the piston actuator would push instead of pull. The piston actuator 76 may be one of an electric actuator, a pneumatic actuator, and a hydraulic actuator. The depicted piston movement is a linear movement.
In order to increase the size of degasification zone, the piston 72 comprises two seals 726 in the form of O-rings that enable the piston to move within the cylinder and keep a substantially liquid-tight connection between the piston and the cylinder 74.
In figures 1-4, the pressure reduction device is located in a lower part of the degasification housing and is configured to be operate below a liquid level in the degasification housing. This, together with the substantially parallel direction 1 of the piston movement, enables the degassing device to be compact and to not take in a lot of space far away from the main flow channel.
It can further be seen that the branch flow passage 30 extends through the cylinder 74 between the main flow channel 20 and the degasification zone 42. In figure 1, a branch flow path 32 is depicted extending from the main flow channel through a cavity 742 in the cylinder and entering the inner volume of the degasification housing 40 through a branch flow hole 744 defined by the cylinder. Further, the valve 60A is integrated in the pressure reduction device; the piston 72 is a part that is moveable into the low pressure position and there obstructs the branch flow passage. In doing so, the piston movement is configured to move the valve 60A to the closed state when it moves from the idle pressure position to the low pressure position.
Looking at an upper region of the degassing device 10, the gas outlet 80 is depicted comprising a floater chamber 86 and the outlet closing body 84 comprises a floater that, in figures 1 floats on the liquid at an upper position 846 and in figure 2 floats on the liquid at a floating position 842. The floater is connected to a float valve wherein, when the amount of liquid increases to a certain level, the floater closes off the float valve because of which the increase in liquid level is inhibited (depicted in figure 1). Alternatively, when the liquid level is lower, the floater does not close off the float valve (as depicted in figure 2). When the pressure reduction device is operated, the liquid level drops due to the increase in volume of the degasification zone. The floater 84 then moves to a lower positon 844 (depicted in figure 3) where it engages the outlet tube 82, this occurs when the liquid level is lower than a first predetermined liquid level 88. In order to seal off the gas outlet, a backflow preventer 852 is present. The backflow preventer prevents gas from the outside to flow into the degasification housing when the outside pressure is greater than the pressure inside the degasification housing. In figure 4, when the pressure inside the housing is increased, the backflow preventer 852 is opened and the free gasses released from the liquid may be evacuated via the gas outlet.
In order to create a flow of liquid into the degasification zone 42, the main flow comprises a constriction 26 located between the first side 22 and the second side 24. By being constricted, the pressure in the main flow is increased near the branch flow passage, forcing a portion of the main flow into the degasification housing.
In operation, a method for degassing a gas-containing liquid in a cooling or heating installation by using a degassing device 10 comprises the steps: a) branching off a portion of the main flow through the branch flow passage 30, b) moving the valves GOA, 60B to their respective closed positions 682A, 62B, respectively obstructing the branch flow passage and the return flow passage, closing off the degasification zone from the main flow channel, and closing the gas outlet 80, c) operating the pressure reduction device to lower the pressure in the degasification zone relative to the pressure in the main flow channel, d) opening the first valve, the second valve, and the gas outlet, wherein during step ¢) gas dissolved in the liquid is separated from the liquid and wherein during and/or after step d) liquid in the degasification housing is returned to the main flow channel through the return flow passage and the separated gas is expelled through the gas outlet.
The abovementioned step b) can be performed by operating the pressure reduction device in the depicted embodiment. In figure 2, the movement 721 of the piston 72 towards the low pressure position leads the non-return valve 60B and the valve 60A for the branch flow passage 30 to close and the decreasing liquid level below a first predetermined level 88 leads the floater to close off the gas outlet tube 82. When the valves 60A, 60B and the gas outlet 80 are closed, the operation of the pressure reduction device lowers the pressure in the degasification zone 42. The end of the movement of the piston 72 in the cylinder 74 by the piston actuator 76 towards the retracted position 724 from the extended position 722 is depicted in figure 3. Here above the liquid in the degasification zone 42, free gas 3 has formed by separating from the liquid. As the valves and the gas outlet are opened, the free gas 3 may evacuate the degassing device through the gas outlet and the liquid in the degasification zone 42 may return to the main flow through the return flow passage.
In the depicted embodiment, prior to step d), the pressure in the degasification zone is increased to substantially the pressure present during step a). this facilitates the opening of the valves.
Turning to figures 5-7, the floater chamber 86 of the gas outlet 80 defines a gas outlet opening 862 through which free gas may be evacuated. The floater 84 itself comprises a protrusion 83 respectively located on a lower side 832 of the floater. The protrusion 83 located on the lower side 832 of the floater has an outer dimension that substantially matches an inner dimension of the outlet tube 82. In doing so the closing of the degasification zone from the outside can be improved because, in operation during step b), the protrusion 83 is forced in the outlet tube 82. By closing the outlet tube directly when the liquid levels drops sufficiently, the amount of free gasses in the degasification zone is reduced, enabling a faster pressure reduction. Because the protrusion seals the outlet tube , the backflow preventer does not need to be present. However, there is no reason why the protrusion and the backflow preventer shouldn’t be combined.
The floater is configured to actuate the float valve 85; when a liquid level is at a second predetermined level 89, the floater 84 is moved to an upper position 846 where it closes the float valve, closing off the gas outlet opening. This is especially useful when too much liquid starts to accumulate inside the degasification zone and the device risks to overflow; the floater 84 together with the floater chamber 86 prevents the overflowing from happening. Herein, the pressure inside the degasification housing is at an overpressure with respect to the outside. This pressure may be equal to a system pressure, i.e. the pressure in the main flow channel.
To improve the closing, the protrusion comprises an O-ring or a double lip seal to even better seal the gas outlet opening 862 and the gas outlet tube 82.
Further, the cylinder 74 comprises a flared end wherein the branch flow passage extends between the piston 72 and the cylinder 74 when the piston is in the idle pressure position 722.
The degassing device also comprises three sensors 92A, 92B, 92C and a control unit 90 that is configured to read out the sensors and to control the piston actuator 76. By measuring the pressure in the degasification zone with sensor 92A and the pressure in the main flow channel 20 with sensor 92B, a pressure difference can be determined by the control unit 90 and the piston actuator 76 can be operated as a function of these measurements. Also, the temperature of the liquid can be determined using a temperature sensor 92C. By determining the temperature of the liquid a pressure at which the liquid starts boiling can be determined and avoided.
Besides using separate sensors 92A, 92B, 92C to determine the state of the degassing device and more particularly the pressure in the degasification zone 42, the control unit 80 may also be configured to measure the current necessary to move the piston 72. Based on the current, the force acting on the piston can be determined which gives a measure for the pressure in the degasification zone 42.
In figure 7, an embodiment of the invention is depicted wherein the main flow channel doesn’t comprise a constriction, but comprises a branch flow separator 28 protruding into the main flow channel. The branch flow separator is configured to branch off a portion of the main flow into the degasification zone Moving to figure 8 and figure 9, an embodiment is shown where the pressure reduction device 70 is not integrated with the valve 60A that closes of the branch flow passage 30. Instead, the branch flow passage can be closed off by an actuated valve 60A that may be moved from the open position 64A to the closed position 82A by the control unit 90. Similarly, the control unit 90 may also control a main flow valve 27 that is configured to temporarily close off the main flow channel 20 to branch off liquid into the degasification housing.
The embodiment depicted in figures 10 and 11 is largely similar to the embodiment depicted in figures 8 and 9. The main difference lies in the presence of a gas outlet valve 87, in particular a ball valve, that may be controlled by the control unit 90. The gas outlet valve allows gas and/or liquid to flow between the outside and the degasification zone in an open position and closes off the degasification zone in a closed position. Soon after the start of the operation of the pressure reduction device 70, the gas outlet valve is closed. In doing so the entire degasification zone 42 is filled with liquid and the degassing of the liquid can be performed more efficiently than if more liquid and/or more gas would initially be present ni the inner volume.
Turning to figures 12 and 13, an embodiment is depicted wherein the piston is moveable in a direction 2 that is substantially orthogonal to the main flow channel. By orienting the pressure reduction device 70 in this manner, the degassing device takes up less lateral space and may be used in narrow spaces. Herein, the cylinder 74 comprises a flared end wherein the branch flow passage extends between the piston 72 and the cylinder 74 when the piston is in the idle pressure position 722.
Further, the piston actuator 76 is fixed to the housing via two resilient member 762.
Besides damping vibrations, the resilient members allow the piston actuator 76 to resiliently move between a first actuator position 764 and a second actuator position 788. In figure 10, the piston actuator is shown in the first actuator position 764 where it engages a biased switch 75 located above the piston actuator. When the pressure reduction device is operate and the pressure inside the degasification zone 42 is reduced, the piston will be pulled away from the switch together with the piston actuator 76. When a predetermined minimum pressure is achieved, e.g. a pressure just above the vapour line of the liquid, the piston actuator moves to the second actuator position 766, disengaging the biased switch 75. Therefore, when in operation, when a force necessary to move the piston to the retracted position 724 exceeds a predetermined value corresponding to a pressure inside the degasification housing, the force moves the piston actuator 76 away from the switch 75, wherein the disengagement of the switch interrupts the operation of the pressure difference device. Besides the mechanical approach using a switch, it will be understood that a stress gauge or a strain gauge in combination with the control unit 90 may achieve the same result.
Turning to figures 14A and 14B, an embodiment of a piston actuator 76 is depicted wherein the piston actuator comprises an electromagnet 71 that is configured to attract and/or repulse the piston 72. By attracting the piston 72 in the idle pressure position 722, the piston 72 is moved into the low pressure position 724. In the depicted embodiment, the piston actuator further comprises a spring 77 that is configured to move the piston back to the idle pressure position 722. This action may also be done by a repulsive force of the magnet 71.
Turning to figure 15, a schematic depiction of an embodiment is shown. Herein the pressure reduction device is a vacuum pump 78 that is connected to the gas outlet 80, wherein the gas outlet comprises a gas outlet valve 87 and a gas outlet tube 82. Further, the degassing device comprises a porous chamber 44 that is located within the volume of the degasification housing 40. When a first valve 60A is open, a portion of the main flow is branched off by the branch flow passage 30 and flows into the porous chamber 44. When the first valve 60A and a second valve 60B are closed, the vacuum pump is operated and the pressure inside the degasification housing is reduced. This leads to dissolved gas in the liquid to separate from the liquid and the gas may then be sucked through a porous element 442 of the porous chamber and may be evacuated by the vacuum pump. Because the porous chamber 42 is only permeable to gases and not to the liquid, the liquid remains in the circuit. After the separated gas has been evacuated, the valves GOA, 60B are opened and the liquid returns to the main flow channel via the return flow passage. Turning to figures 16 and 17, a similar embodiment to that of figures 8 and 9 is depicted. The main difference being the presence of one flow passage 15 that allows communication between the degasification zone and the main flow channel. In the depicted embodiment, the degasification zone 42 is filled with liquid from the main flow channel 20. Subsequently the valve 60 is moved from an open position 64 to a closed position 62 and the pressure reduction device is operated. Thereafter, when the liquid has been degassed, the valve is moved to the open position 64 and the liquid returns to the main flow channel 20 through the flow passage
15. The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and/or having, as used herein, are defined as comprising i.e., open language, not excluding other elements or steps. Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention. It will be recognized that a specific embodiment as claimed may not achieve all of the stated objects. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. White lines between text paragraphs in the text above indicate that the technical features presented in the paragraph may be considered independent from technical features discussed in a preceding paragraph or in a subsequent paragraph.

Claims (51)

-21- CONCLUSIES-21- CONCLUSIONS 1. Ontgassingsinrichting (10) voor het ontgassen van een gas-bevattende vloeistof in een koelings- of verwarmingsinstallatie, waarbij de ontgassingsinrichting omvat: - een hoofdstroomkanaal (20) dat gedefinieerd is door een buis die zich tussen een eerste zijde (22) en een tweede zijde (24) uitstrekt, waarbij in gebruik een hoofdstroom van vloeistof door het hoofdstroomkanaal vloeit, - ten minste één stroomdoorgang (15) die zich uitstrekt tussen het hoofdstroomkanaal en een ontgassingszone (42), waarbij de stroomdoorgang ingericht is om communicatie toe te staan tussen de ontgassingszone en het hoofdstroomkanaal, - een ontgassingsbehuizing (40) die een binnen-volume definieert, waarbij het binnen-volume wezenlijk overeenkomt met de ontgassingszone, - ten minste één klep (60) die beweegbaar is tussen een gesloten positie (62) en een open positie (64), waarbij in de gesloten positie de klep de stroomdoorgang verspert en de ontgassingszone afsluit van het hoofdstroomkanaal, en waarbij in de open positie de klep niet de stroomdoorgang verspert, - een drukverminderingsinrichting (70) die verbonden is met de ontgassingsbehuizing, waarbij in gebruik de drukverminderingsinrichting ingericht is om de druk in de ontgassingszone te verminderen ten opzichte van de druk in het hoofdstroomkanaal, - een gasuitlaat (80) in de ontgassingsbehuizing, waarbij de gasuitlaat een uitlaatbuis {82) en een uitlaat-afsluitlichaam (84) omvat, waarbij de uitlaatbuis afsluitbaar is door het uitlaat-afsluitlichaam, waarbij de gasuitlaat en de ten minste ene klep ingericht zijn om de ontgassingsbehuizing af te sluiten, en waarbij de drukverminderingsinrichting ingericht is om de gas-bevattende vloeistof te ontgassen.A degassing device (10) for degassing a gas-containing liquid in a cooling or heating installation, the degassing device comprising: - a main flow channel (20) defined by a tube located between a first side (22) and a second side (24), wherein in use a main flow of liquid flows through the main flow channel, - at least one flow passage (15) extending between the main flow channel and a degassing zone (42), the flow passage being arranged to allow communication between the degassing zone and the main flow channel, - a degassing housing (40) defining an inner volume, the inner volume substantially corresponding to the degassing zone, - at least one valve (60) movable between a closed position (62) and an open position (64), wherein in the closed position the valve obstructs the flow passage and closes the degassing zone from the main flow channel, and wherein in the open position does not obstruct the valve flow passage, - a pressure reducing device (70) connected to the degassing housing, wherein in use the pressure reducing device is arranged to reduce the pressure in the degassing zone with respect to the pressure in the main flow duct, - a gas outlet (80) in the degassing housing, wherein the gas outlet comprises an outlet tube {82) and an outlet closure body (84), the outlet tube is closable by the outlet closure body, the gas outlet and the at least one valve being arranged to open the degassing housing and wherein the pressure reducing device is adapted to degas the gas-containing liquid. 2. Ontgassingsinrichting volgens de vorige conclusie, waarbij de inrichting twee stroomdoorgangen omvat, waarbij een eerste stroomdoorgang een aftakdoorgang (30) is, waarbij de aftakdoorgang is ingericht om een aftakstroom die een deel is van de hoofdstroom af te takken, en waarbij een tweede stroomdoorgang een retourdoorgang (50) is die zich uitstrekt tussen de ontgassingszone en het hoofdstroomkanaal, waarbij de retourdoorgang ingericht is om een retourstroom naar het hoofdstroomkanaal te terug te leiden.A degassing device according to the preceding claim, wherein the device comprises two flow passages, wherein a first flow passage is a branch passage (30), wherein the branch passage is arranged to branch a branch flow which is part of the main flow, and wherein a second flow passage is a return passage (50) extending between the degassing zone and the main flow channel, the return passage being arranged to return a return flow to the main flow channel. 3. Ontgassingsinrichting volgens de vorige conclusie, waarbij de ontgassingsinrichting een eerste klep (60A) omvat die beweegbaar is tussen een gesloten positie en eenThe degassing device according to the preceding claim, wherein the degassing device comprises a first valve (60A) movable between a closed position and a -22- open positie, waarbij in de gesloten positie de eerste klep de aftakdoorgang verspert en de ontgassingszone afsluit van het hoofdstroomkanaal en waarbij in de open positie de eerste klep niet de aftakdoorgang verspert, en waarbij de ontgassingsinrichting een tweede klep (60B) omvat die beweegbaar is tussen een gesloten positie en een open positie, waarbij in de gesloten positie de tweede klep de retourdoorgang verspert en de ontgassingszone afsluit van het hoofdstroomkanaal en waarbij in de open positie de tweede klep niet de retourdoorgang verspert.-22- open position, wherein in the closed position the first valve obstructs the branch passage and closes the degassing zone from the main flow channel and wherein in the open position the first valve does not obstruct the branch passage, and wherein the degassing device comprises a second valve (60B) which movable between a closed position and an open position, wherein in the closed position the second valve obstructs the return passage and closes the degassing zone from the main flow channel and wherein in the open position the second valve does not obstruct the return passage. 4. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de drukverminderingsinrichting verbonden is met de ontgassingsbehuizing en waarbij de drukverminderingsinrichting een zuiger (72), een cilinder (74), en een zuigeractuator (78) omvat en waarbij de zuiger beweegbaar is tussen een inactieve druk-positie (722) en een lage druk-positie (724) en waarbij de cilinder in open verbinding staat met het binnen-volume, waarbij in de lage druk-positie van de zuiger de ontgassingszone zich binnenin de cilinder uitstrekt en groter is dan in de inactieve druk-positie van de zuiger, waarbij de ontgassingszone begrensd wordt door de ontgassingsbehuizing en door ten minste een deel van een buitenoppervlak van de zuiger en/of door ten minste een deel van het binnenoppervlak van de cilinder.A degassing device according to any one of the preceding claims, wherein the pressure reducing device is connected to the degassing housing and wherein the pressure reducing device comprises a piston (72), a cylinder (74), and a piston actuator (78) and wherein the piston is movable between an inactive pressure position (722) and a low pressure position (724) and wherein the cylinder is in open communication with the inner volume, wherein in the low pressure position of the piston the degassing zone extends inside the cylinder and is greater than in the inactive pressure position of the piston, wherein the degassing zone is defined by the degassing housing and by at least a portion of an outer surface of the piston and/or by at least a portion of the inner surface of the cylinder. 5. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij een teruggetrokken positie (723) van de zuiger overeenkomt met de lage druk-positie van de zuiger en een uitgestrekte positie (725) van de zuiger overeenkomt met de inactieve druk-positie, of waarbij een uitgestrekte positie van de zuiger overeenkomt met de lage druk- positie van de zuiger en een teruggetrokken positie van de zuiger overeenkomt met de inactieve druk-positie.A venting device according to any one of the preceding claims, wherein a retracted position (723) of the piston corresponds to the low pressure position of the piston and an extended position (725) of the piston corresponds to the inactive pressure position, or wherein an extended position of the piston corresponds to the low pressure position of the piston and a retracted position of the piston corresponds to the inactive pressure position. 6. Ontgassingsinrichting volgens elk van conclusies 4-5, waarbij de zuigeractuator bevestigd is aan de ontgassingsbehuizing via een of meer verende elementen (762) en waarbij de zuigeractuator verend beweegbaar is tussen een eerste actuatorpositie (784) en een tweede actuatorpositie (766).The venting device of any of claims 4-5, wherein the piston actuator is attached to the vent housing via one or more resilient members (762) and wherein the piston actuator is resiliently movable between a first actuator position (784) and a second actuator position (766). 7. Ontgassingsinrichting volgens de voorgaande conclusie, waarbij de zuiger ten minste deels beweegbaar is binnenin de cilinder,A degassing device according to the preceding claim, wherein the piston is at least partly movable inside the cylinder, -23.-23. 8. Ontgassingsinrichting volgens elk van conclusies 4-7, waarbij de zuiger beweegbaar is in een richting (1) die wezenlijk evenwijdig is aan het hoofdstroomkanaal, waarbij bij voorkeur het hoofdstroomkanaal wezenlijk horizontaal georiënteerd is en de richting wezenlijk horizontaal georiënteerd is, of waarbij bij voorkeur het hoofdstroomkanaal wezenlijk verticaal georiënteerd is en de richting wezenlijk verticaal georiënteerd is.A degassing device according to any one of claims 4-7, wherein the piston is movable in a direction (1) substantially parallel to the main flow channel, preferably the main flow channel is oriented substantially horizontally and the direction is oriented substantially horizontally, or wherein at preferably the main flow channel is oriented substantially vertically and the direction is oriented substantially vertically. 9. Ontgassingsinrichting volgens elk van conclusies 4-8, waarbij de zuiger beweegbaar is in een richting (2) die wezenlijk orthogonaal is aan het hoofdstroomkanaal, waarbij bij voorkeur het hoofdstroomkanaal wezenlijk horizontaal georiënteerd is en de richting wezenlijk verticaal georiënteerd is.A degassing device according to any one of claims 4-8, wherein the piston is movable in a direction (2) which is substantially orthogonal to the main flow channel, preferably the main flow channel is oriented substantially horizontally and the direction is oriented substantially vertically. 10. Ontgassingsinrichting volgens elk van conclusies 4-9, waarbij de zuiger is direct contact staat met e vloeistof en bij voorkeur geen membraan aanwezig is tussen de zuiger en de ontgassingszone.Degassing device according to any one of claims 4-9, wherein the piston is in direct contact with the liquid and preferably no membrane is present between the piston and the degassing zone. 11. Ontgassingsinrichting volgens elk van conclusies 4-10, waarbij de zuiger ten minste een afdichting (726) omvat, in het bijzonder twee afdichtingen die op een afstand van elkaar geplaatst zijn, waarbij de afdichtingen in het bijzonder O-ringen zijn, meer in het bijzonder dubbele lipafdichtingen zijn, waarbij de afdichtingen ingericht zijn om een hoeveelheid vloeistof te minimaliseren die kan stromen tussen de zuiger en de cilinder.Degassing device according to any one of claims 4-10, wherein the piston comprises at least one seal (726), in particular two seals spaced apart, the seals in particular being O-rings, more in particular in particular double lip seals, the seals being arranged to minimize an amount of liquid that can flow between the piston and the cylinder. 12. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de drukverminderingsinrichting gelegen is een lager deel van de ontgassingsbehuizing en waarbij de drukverminderingsinrichting ingericht is om gebruikt te kunnen worden onder een vloeistofniveau in de ontgassingsbehuizing.A degassing device according to any one of the preceding claims, wherein the pressure reducing device is located in a lower part of the degassing housing and wherein the pressure reducing device is adapted to be used below a liquid level in the degassing housing. 13. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de aftakdoorgang zich door de cilinder heen uitstrekt tussen het hoofdstroomkanaal en de ontgassingszone en waarbij een zuigerbeweging ingericht is om de eerste klep naar de gesloten positie te bewegen.A degassing device according to any one of the preceding claims, wherein the branch passage extends through the cylinder between the main flow channel and the degassing zone and wherein a piston movement is arranged to move the first valve to the closed position. 14. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij een holte (742) in de cilinder en tussen het hoofdstroomkanaal en de zuiger gelegen is, waarbij een aftakstroompad (32) zich door de holte uitstrekt, in het bijzonder achter de zuiger en om een zuigerstang.A degassing device according to any one of the preceding claims, wherein a cavity (742) is located in the cylinder and between the main flow channel and the piston, a branch flow path (32) extending through the cavity, in particular behind the piston and around a piston rod. 15. Ontgassingsinrichting volgens de voorgaande conclusie, waarbij de cilinder een aftakstroomgat (744) definieert, waarbij het aftakstroompad zich door deThe degassing device of the preceding claim, wherein the cylinder defines a branch flow hole (744), the branch flow path extending through the -24- aftakstroomdoorgang, door de holte en door het aftakstroomgat naar binnenin het binnen-volume uitstrekt.-24- branch flow passage, extending through the cavity and through the branch flow hole into the inner volume. 16. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de eerste klep geïntegreerd is in de drukverminderingsinrichting, in het bijzonder in de zuiger, waarbij de zuiger een deel omvat dat de aftakdoorgang verspert in de lage druk- positie.A degassing device according to any one of the preceding claims, wherein the first valve is integrated in the pressure reducing device, in particular in the piston, the piston comprising a part which blocks the branch passage in the low pressure position. 17. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de tweede klep een terugslagklep is.A degassing device according to any one of the preceding claims, wherein the second valve is a check valve. 18. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de gasuitlaat verder een dobberkamer (86) omvat en het afsluitlichaam een dobber omvat die beweegbaar is tussen een drijvende positie (842) en een lagere positie (844), waarbij wanneer een vloeistofniveau onder een vooraf bepaald niveau (88) zakt, de dobber aangrijpt op een uiteinde van de uitlaatbuis in de lagere positie, waarbij de uitlaatbuis gesloten wordt.A degassing device according to any one of the preceding claims, wherein the gas outlet further comprises a float chamber (86) and the closure body comprises a float movable between a floating position (842) and a lower position (844) wherein when a liquid level is below a predetermined level (88) falls, the float engages one end of the exhaust tube in the lower position, closing the exhaust tube. 19. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de dobber kamer een vlotterklep (85) omvat die een gasuitlaatopening definieert en waarbij wanneer een vloeistofniveau hoger is dan een tweede vooraf bepaald niveau (89), het afsluitichaam naar een hogere positie (846) bewogen wordt waar het de vlotterklep afsluit.A degassing device according to any one of the preceding claims, wherein the float chamber includes a float valve (85) defining a gas outlet opening and wherein when a liquid level is higher than a second predetermined level (89), the closing body moves to a higher position (846) is moved where it closes the float valve. 20. Ontgassingsinrichting volgens elk van conclusies 18-19, waarbij de dobber een uitsteeksel (83) omvat dat ingericht is om de uitlaatbuis af te sluiten en aan een onderzijde (832) van de dobber gelegen is, en waarbij een buitenste afmeting van het uitsteeksel overeenkomt met een binnenste afmeting van de uitlaatbuis.The venting device of any one of claims 18-19, wherein the bob comprises a projection (83) adapted to close off the outlet tube and located on an underside (832) of the bob, and wherein an outer dimension of the projection corresponds to an inner dimension of the exhaust pipe. 21. Ontgassingsinrichting volgens elk van conclusies 18-20, waarbij de vlotterklep een terugstroomverhindering (852) omvat die ingericht is om gas te laten ontsnappen en om niet gas de gasuitlaat binnen t laten, in het bijzonder is de terugstroomverhindering een terugslagklep.A degassing device according to any one of claims 18-20, wherein the float valve comprises a backflow preventer (852) adapted to allow gas to escape and not let gas into the gas outlet, in particular the backflow preventer is a check valve. 22. Ontgassingsinrichting volgens elk van conclusies 19-21, waarbij de vlotter een O-ring of een dubbele lipafdichting omvat of de uitlaatbuis af te sluiten in de lagere positie.A degassing device according to any one of claims 19-21, wherein the float comprises an O-ring or a double lip seal or to close the outlet tube in the lower position. 23. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de gasuitlaat een gasuitlaatklep (87) omvat, waarbij de gasuitlaatklep gas en/of vloeistof 40 toestaat te stromen tussen de buitenkant en de ontgassingszone in een open staat enA degassing device according to any one of the preceding claims, wherein the gas outlet comprises a gas outlet valve (87), the gas outlet valve permitting gas and/or liquid 40 to flow between the exterior and the degassing zone in an open state and - 05. de ontgassingszone afsluit in een gesloten positie, in het bijzonder is de gasuiltaatklep een kogelklep.05. closes the degassing zone in a closed position, in particular the gas exhaust valve is a ball valve. 24. Ontgassingsinrichting volgens elk van de voorgaande conclusies, verder omvattende een vacuümpomp (78) die verbonden is met de gasuitlaat, en een poreuze kamer (44) die in het binnen-volume van de ontgassingsbehuizing gelegen is, waarbij de aftakdoorgang een deel van de hoofdstroom naar binnen de poreuze kamer aftakt en de retourdoorgang zich uitstrekt tussen de poreuze kamer en het hoofdstroomkanaal, waarbij de poreuze kamer een poreus element (442) omvat dat permeabel is voor gassen en impermeabel is voor de vloeistof.A degassing device according to any one of the preceding claims, further comprising a vacuum pump (78) connected to the gas outlet, and a porous chamber (44) located in the interior volume of the degassing housing, the branch passageway being a portion of the degassing housing. branches off the main stream into the porous chamber and the return passage extends between the porous chamber and the main flow channel, the porous chamber comprising a porous element (442) which is permeable to gases and impermeable to the liquid. 25. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij het hoofdstroomkanaal ingesnoerd is tussen de eerste zijde en de tweede zijde, waarbij een insnoering {26) ingericht is om druk nabij de aftakdoorgang toe te laten nemen waardoor een deel van de hoofdstroom de ontgassingsbehuizing in wordt geforceerd, en/of waarbij het hoofdstroomkanaal een aftakstroomscheider (28) omvat die zich uitstrekt in het hoofdstroomkanaal en die ingericht is om een deel van de hoofdstroom naar de ontgassingszone af te takken, en/of waarbij het hoofdstroomkanaal een hoofdstroomklep (27) omvat die ingericht is om een deel van de hoofdstroom naar de ontgassingszone af te takken.A degassing device according to any one of the preceding claims, wherein the main flow channel is constricted between the first side and the second side, wherein a constriction {26) is arranged to increase pressure near the branch passage through which part of the main flow enters the degassing housing. is forced, and/or wherein the main flow channel comprises a branch flow separator (28) extending into the main flow channel and arranged to branch off a portion of the main flow to the degassing zone, and/or wherein the main flow channel comprises a main flow valve (27). which is arranged to branch off part of the main flow to the degassing zone. 26. Ontgassingsinrichting volgens elk van de voorgaande conclusies, verder omvattende een terugverende schakelaar (75) die ingericht is om het gebruik van de drukverminderingsinrichting te onderbreken, waarbij in de eerste actuatorpositie de zuigeractuator de terugverende schakelaar indrukt, en in de tweede actuatorpositie de schakelaar terugveert.A venting device according to any one of the preceding claims, further comprising a spring-back switch (75) adapted to interrupt use of the pressure-reducing device, wherein in the first actuator position, the piston actuator depresses the spring-back switch, and in the second actuator position, the switch springs back. . 27. Ontgassingsinrichting volgens elk van de voorgaande conclusies, verder omvattende ten minste één sensor (92) en een aansturingseenheid (90) ingericht om de ten minste ene sensor uit te lezen en/of om de drukverminderingsinrichting aan te sturen.A degassing device according to any one of the preceding claims, further comprising at least one sensor (92) and a control unit (90) adapted to read out the at least one sensor and/or to control the pressure reduction device. 28. Ontgassingsinrichting volgens de voorgaande conclusie, waarbij een eerste druksensor (92A) gelegen is in het hoofdstroomkanaal en waarbij een tweede druksensor (92B) gelegen is in de ontgassingszone, en waarbij de aansturingseenheid ingericht is om de drukverminderingsinrichting aan te sturen als functie van een output van de eerste druksensor en/of de tweede druksensor,A degassing device according to the preceding claim, wherein a first pressure sensor (92A) is located in the main flow channel and wherein a second pressure sensor (92B) is located in the degassing zone, and wherein the control unit is arranged to control the pressure reduction device as a function of a output of the first pressure sensor and/or the second pressure sensor, 29. Ontgassingsinrichting volgens elk van conclusies 27-28, waarbij ten minste een sensor een stroommetingsinrichting is ingericht om de stroom die nodig is om de 40 zuiger te bewegen vast te stellen.A degassing device according to any one of claims 27-28, wherein at least one sensor and flow measuring device is arranged to determine the flow required to move the piston. - 26 -- 26 - 30. Ontgassingsinrichting volgens elk van conclusies 27-29, waarbij de drukverminderingsinrichting de sensor omvat ingericht om een druk vast te stelle in de ontgassingszone.A degassing device according to any one of claims 27-29, wherein the pressure reducing device comprises the sensor arranged to detect a pressure in the degassing zone. 31. Ontgassingsinrichting volgens elk van conclusies 27-30, waarbij ten minste een sensor een spanningsmeter of een rekmeter is.A degassing device according to any one of claims 27-30, wherein at least one sensor is a strain gauge or a strain gauge. 32. Ontgassingsinrichting volgens elk van conclusies 27-31, verder omvattende een temperatuursensor (92C), waarbij de temperatuursensor in het bijzonder is het hoofdstroomkanaal gelegen is.A degassing device according to any one of claims 27-31, further comprising a temperature sensor (92C), the temperature sensor in particular being located in the main flow channel. 33.Ontgassingsinrichting volgens elk van conclusies 27-32, waarbij de aansturingseenheid verder ingericht is om ten minste een van de eerste klep, de tweede klep, en de hoofdstroomklep aan te sturen.A degassing device according to any one of claims 27-32, wherein the control unit is further configured to actuate at least one of the first valve, the second valve, and the main flow valve. 34. Ontgassingsinrichting volgens elk van de voorgaande conclusies, waarbij de drukverminderingsinrichting en minste deels aan een stroomopwaartse zijde van de ontgassingsbehuizing gepositioneerd is, waarbij in het bijzonder de zuigeractuator aan een stroomopwaartse zijde van de ontgassingsbehuizing gelegen is.A degassing device according to any one of the preceding claims, wherein the pressure reducing device is positioned at least partly on an upstream side of the degassing housing, in particular the piston actuator being located on an upstream side of the degassing housing. 35. Werkwijze voor het ontgassen van een gas-bevattende vloeistof in een koelings- of verwarmingsinstallatie doormiddel van een ontgassingsinrichting (10), waarbij de ontgassingsinrichting omvat: - een hoofdstroomkanaal (20) waarbij een hoofdstroom van vloeistof door het hoofdstroomkanaal vloeit, - ten minste één stroomdoorgang (15) die zich uitstrekt tussen het hoofdstroomkanaal en een ontgassingszone (42), - een ontgassingsbehuizing (40) die een binnen-volume definieert, waarbij het binnen-volume wezenlijk overeenkomt met de ontgassingszone, - ten minste één klep (60) die beweegbaar is tussen een gesloten positie (62) en een open positie (64), - een drukverminderingsinrichting (70) die verbonden is met de ontgassingsbehuizing, - een gasuitlaat (80) in de ontgassingsbehuizing, waarbij de gasuitlaat een uitlaatbuis (82) en een uitlaat-afsluitlichaam (84) omvat, waarbij de uitlaatbuis afsluitbaar is door het uitlaat-afsluitlichaam, waarbij de werkwijze de stappen omvat: a) het aftakken van een deel van de hoofdstroom door de aftakdoorgang,A method for degassing a gas-containing liquid in a cooling or heating installation by means of a degassing device (10), the degassing device comprising: - a main flow channel (20) wherein a main flow of liquid flows through the main flow channel, - at least one flow passage (15) extending between the main flow channel and a degassing zone (42), - a degassing housing (40) defining an interior volume, the interior volume substantially corresponding to the degassing zone, - at least one valve (60) movable between a closed position (62) and an open position (64), - a pressure reducing device (70) connected to the degassing housing, - a gas outlet (80) in the degassing housing, the gas outlet being an exhaust tube (82) and comprises an outlet closure body (84), the outlet tube being closable by the outlet closure body, the method comprising the steps of: a) branching of a portion of the main flow through the branch passage, - 27 - b) het naar de gesloten positie bewegen van de ten minste ene klep, waarmee respectievelijk de aftakdoorgang en de retourdoorgang versperd worden, waarbij de ontgassingszone afgesloten wordt van het hoofdstroomkanaal, en het sluiten van de gasuitlaat, c) het in werking stellen van de drukverminderingsinrichting om de druk in de ontgassingszone te verlagen ten opzichte van de druk in het hoofdstroomkanaal, d) het openen van de ten minste ene klep en de gasuitlaat, waarbij tijdens stap c) gas opgelost in de vloeistof gescheiden wordt van de vloeistof en waarbij tijdens en/of na stap d) vloeistof in de ontgassingsbehuizing teruggeleid wordt naar het hoofdstroomkanaal door de retourdoorgang en het afgescheiden gas uitgestoten wordt door de gasuitlaat.- 27 - b) moving the at least one valve to the closed position, blocking the branch passage and the return passage, respectively, closing the degassing zone from the main flow channel, and closing the gas outlet, c) actuating of the pressure reducing device to reduce the pressure in the degassing zone with respect to the pressure in the main flow channel, d) opening the at least one valve and the gas outlet, wherein during step c) gas dissolved in the liquid is separated from the liquid and wherein during and/or after step d) liquid in the degassing housing is returned to the main flow channel through the return passage and the separated gas is expelled through the gas outlet. 36. Werkwijze volgens de vorige werkwijzeconclusie, waarbij de ontgassingsinrichting twee stroomdoorgangen omvat, waarbij een eerste stroomdoorgang een aftakdoorgang (30) is en een tweede stroomdoorgang een retourdoorgang (50) is.A method according to the preceding method claim, wherein the degassing device comprises two flow passages, wherein a first flow passage is a branch passage (30) and a second flow passage is a return passage (50). 37. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de drukverminderingsinrichting verbonden is met de ontgassingsbehuizing en waarbij de drukverminderingsinrichting een zuiger (72), een cilinder (74), en een zuigeractuator (76) omvat, waarbij de zuiger in open verbinding staat met het binnen-volume, en waarbij tijdens stap c) de zuiger tussen een uitgestrekte positie (722) en een teruggetrokken positie (724) bewogen wordt, waarbij de ontgassingszone begrensd wordt door de ontgassingsbehuizing en de zuiger.A method according to any one of the preceding method claims, wherein the pressure reducing device is connected to the degassing housing and wherein the pressure reducing device comprises a piston (72), a cylinder (74), and a piston actuator (76), the piston in open communication with the inner volume, and wherein during step c) the piston is moved between an extended position (722) and a retracted position (724) wherein the degassing zone is defined by the degassing housing and the piston. 38. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de ontgassingszone vergroot wordt naar binnenin de cilinder wanneer de zuiger bewogen wordt van de uitgestrekte positie naar de teruggetrokken positie en de ontgassingszone groter is in de teruggetrokken positie dan in de uitgestrekte positie, of waarbij de ontgassingszone vergroot wordt naar binnenin de cilinder wanneer de zuiger bewogen wordt van de teruggetrokken positie naar de uitgestrekte positie en de ontgassingszone groter is in de uitgestrekte positie dan in de teruggetrokken positie.A method according to any one of the preceding method claims, wherein the degassing zone is enlarged inwardly of the cylinder when the piston is moved from the extended position to the retracted position and the degassing zone is larger in the retracted position than in the extended position, or wherein the degassing zone is larger in the retracted position than in the extended position. degassing zone is enlarged inwardly of the cylinder when the piston is moved from the retracted position to the extended position and the degassing zone is larger in the extended position than in the retracted position. 39. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de aftakdoorgang zich door de cilinder uitstrekt tussen het hoofdstroomkanaal en de ontgassingszone en waarbij stap b) en stap c) wezenlijk gelijktijdig plaatsvinden en waarbij hetA method according to any one of the preceding method claims, wherein the branch passage extends through the cylinder between the main flow channel and the degassing zone and wherein step b) and step c) take place substantially simultaneously and wherein the - 08 - bewegen van de zuiger de ten minste ene klep naar de gesloten positie beweegt en/of de gasuitlaat sluit.- 08 - moving the piston moves the at least one valve to the closed position and/or closes the gas outlet. 40. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij het uitlaat- afsluitlichaam een dobber omvat en waarbij wanneer een vloeistofniveau lager is dan een vooraf bepaald niveau (88), de vlotter een uitlaatbuis (82) sluit.A method according to any one of the preceding method claims, wherein the outlet closure body comprises a float and wherein when a liquid level is less than a predetermined level (88), the float closes an outlet tube (82). 41. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de gasuitlaat verder een vlotterklep (85) omvat en waarbij wanneer een vloeistofniveau een tweede vooraf bepaald niveau bereikt, de vlotterklep de gasuitlaatopening afsluit.A method according to any one of the preceding method claims, wherein the gas outlet further comprises a float valve (85) and wherein when a liquid level reaches a second predetermined level, the float valve closes the gas outlet opening. 42. Werkwijze volgens elk van conclusies 40-41, waarbij de vlotter een uitsteeksel (83) omvat en een buitenafmeting van het uitsteeksel wezenlijk overeenkomt met een binnenafmeting van de uitlaatbuis en waarbij tijdens stap b) het uitsteeksel in the uitlaatbuis geforceerd wordt.A method according to any one of claims 40-41, wherein the float comprises a projection (83) and an outer dimension of the projection substantially corresponds to an inner dimension of the exhaust tube and wherein during step b) the projection is forced into the exhaust tube. 43. Werkwijze volgens elk van conclusies 40-42, waarbij de vlotter een terugstroomverhindering (852) omvat, waarbij de terugstroomverhindering voorkomt dat gas de ontgassingszone in stroomt wanneer een buitendruk groter is dan een druk binnenin de ontgassingsbehuizing.The method of any one of claims 40-42, wherein the float comprises a backflow preventer (852), the backflow preventer preventing gas from flowing into the degassing zone when an outside pressure is greater than a pressure inside the degassing housing. 44 Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij het hoofdstroomkanaal ingesnoerd is tussen de eerste zijde en de tweede zijde, waarbij een insnoering (26) de druk nabij de aftakdoorgang toe laat nemen en een deel van de hoofdstroom de ontgassingsbehuizing in forceert, en/of waarbij het hoofdstroomkanaal een aftakstroomscheider (28) omvat die zich uitstrekt in het hoofdstroomkanaal en een deel van de hoofdstroom naar de ontgassingszone aftakt, en/of waarbij het hoofdstroomkanaal een hoofdstroomklep (27) omvat die ingericht is om een deel van de hoofdstroom naar de ontgassingszone af te takken.A method according to any one of the preceding method claims, wherein the main flow channel is constricted between the first side and the second side, wherein a constriction (26) increases the pressure near the branch passage and forces a portion of the main stream into the degassing housing, and/ or wherein the main flow channel comprises a branch flow separator (28) extending into the main flow channel and branches off a portion of the main flow to the degassing zone, and/or wherein the main flow channel comprises a main flow valve (27) arranged to divert a portion of the main flow to the degassing zone. 45. Werkwijze volgens de vorige werkwijzeconclusie, waarbij voor stap d), de druk in de ontgassingszone wordt verhoogd tot wezenlijk de druk aanwezig tijdens stap a).A method according to the previous method claim, wherein before step d), the pressure in the degassing zone is increased to substantially the pressure present during step a). 46. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de ontgassingsinrichting verder een terugverende schakelaar (75) omvat en de zuigeractuator bevestigd is aan de ontgassingsbehuizing via een of meer verende elementen (762) en waarbij de zuigeractuator verend beweegbaar is tussen een eerste actuatorpositie (764) en een tweede actuatorpositie (766), waarbij wanneer een kracht die nodig is om de zuiger naar de teruggetrokken 40 positie te bewegen een vooraf bepaalde waarde die overeenkomt met een minimaleA method according to any one of the preceding method claims, wherein the venting device further comprises a springback switch (75) and the piston actuator is attached to the venting housing via one or more resilient members (762) and wherein the piston actuator is resiliently movable between a first actuator position ( 764) and a second actuator position (766) where when a force required to move the piston to the retracted position 40 has a predetermined value corresponding to a minimum -29. druk binnenin de ontgassingsbehuizing overstijgt, de kracht de zuigeractuator beweegt van een eerste actuatorpositie, waar de schakelaar ingedrukt is, naar een tweede actuatorpositie, waar de schakelaar teruggeveerd is, waarbij het terugveren van de schakelaar de werking van de drukverminderingsinrichting onderbreekt.-29. exceeds the pressure within the vent housing, the force moves the piston actuator from a first actuator position, where the switch is depressed, to a second actuator position, where the switch is springbacked, the springback of the switch interrupting the operation of the pressure reducing device. 47. Werkwijze volgens elk van de vorige werkwijzeconclusies, waarbij de ontgassingsinrichting verder ten minste een sensor (92) en een aansturingseenheid (90) omvat, waarbij de aansturingseenheid de ten minste ene sensor uitleest en/of de drukverminderingsinrichting aanstuurt.A method according to any one of the preceding method claims, wherein the degassing device further comprises at least one sensor (92) and a control unit (90), the control unit reading the at least one sensor and/or controlling the pressure reducing device. 48. Werkwijze volgens de vorige conclusie, waarbij de sensor een krachtsensor is die verbonden is met de zuigeractuator en de ontgassingsbehuizing, waarbij de sensor een kracht meet die op de zuigeractuator werkt in een richting die wezenlijk evenwijdig is aan een centrale as van de cilinder.The method of the preceding claim, wherein the sensor is a force sensor connected to the piston actuator and the degassing housing, the sensor measuring a force acting on the piston actuator in a direction substantially parallel to a central axis of the cylinder. 49. Werkwijze volgens de vorige conclusie, waarbij een eerst druksensor (92A) gelegen is in het hoofdstroomkanaal en waarbij een tweede druksensor (92B) gelegen is in de ontgassingszone.The method of the preceding claim, wherein a first pressure sensor (92A) is located in the main flow channel and wherein a second pressure sensor (92B) is located in the degassing zone. 50. Werkwijze volgens elk van conclusies 47-49, waarbij de ontgassingsinrichting verder een temperatuursensor (92C) omvat, waarbij de temperatuursensor in het bijzonder gelegen is in het hoofdstroomkanaal.A method according to any one of claims 47-49, wherein the degassing device further comprises a temperature sensor (92C), the temperature sensor being particularly located in the main flow channel. 51. Werkwijze volgens elk van conclusies 47-50, waarbij de aansturingseenheid ten minste een van de eerste klep, de tweede klep, de hoofdstroomklep, en de gasuitlaatklep aanstuurt.The method of any of claims 47-50, wherein the control unit controls at least one of the first valve, the second valve, the main flow valve, and the gas outlet valve.
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US7850767B2 (en) * 2007-08-08 2010-12-14 Tokheim Holding Bv Anti-foaming degassing device for use in fuel dispensing equipment, particularly in biofuel dispensing equipment
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