WO2004023047A1 - Control damper - Google Patents

Control damper Download PDF

Info

Publication number
WO2004023047A1
WO2004023047A1 PCT/SE2002/001595 SE0201595W WO2004023047A1 WO 2004023047 A1 WO2004023047 A1 WO 2004023047A1 SE 0201595 W SE0201595 W SE 0201595W WO 2004023047 A1 WO2004023047 A1 WO 2004023047A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
valve
duct
flow
pipe
Prior art date
Application number
PCT/SE2002/001595
Other languages
French (fr)
Inventor
Jerry Borander
Original Assignee
Jerry Borander
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to SE0100797A priority Critical patent/SE518776C2/en
Application filed by Jerry Borander filed Critical Jerry Borander
Priority to AU2002335573A priority patent/AU2002335573A1/en
Priority to EP02807773A priority patent/EP1546613A1/en
Priority to PCT/SE2002/001595 priority patent/WO2004023047A1/en
Publication of WO2004023047A1 publication Critical patent/WO2004023047A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/02Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
    • F16K7/08Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by twisting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24Means for preventing or suppressing noise
    • F24F2013/242Sound-absorbing material

Definitions

  • the present invention relates to a valve for controlling air flow or other flowing medium.
  • the valve comprises a sleeve of flexible material, one end of which is fixed in relation to the duct in which the flow occurs and the other end of which can be turned with displacement in an axial direction that is controlled in proportion to the rotation.
  • Control valves of the type to which the invention relates are used primarily for controlling the air flow in air conditioning installations and ventilation systems by causing a fall in pressure and for controlling the air flow to individual rooms and proportionately to other rooms within the area of the same ventilation system. In order to achieve this, control valves are fitted at a number of different points within the system. In addition to controlling the flow rates, valves are also used for measuring the pressure drop over the valve, which forms the basis for calculation of the flow rates in the system.
  • valves Two different types of known valve are most commonly used for these purposes.
  • the simplest type consists of a disk which is rotatably mounted in the flow duct so that the disk is perpendicular to the direction of flow when the valve is closed. From this position the disk can be rotated about an axis in the plane of the disk and passing though its centre.
  • the ventilation ducts are most commonly sheet metal conduits of circular cross-section and the valve then suitably takes the form of a circular sheet metal plate, the size of which corresponds to the inside diameter of the duct.
  • This type of valve has significant disadvantages due to turbulence in the air flow downstream of the valve, which gives rise to undesirable noise and may distort the measuring conditions for the differential pressure measurement.
  • Iris valves may be used in order to obtain better air flow conditions. These provide a centred restriction of the air flow, which results in a smoother air flow. Iris valves also have a short overall length. However, iris valves also cause turbulence in that the air in this case, too, must pass over a sharp edge, and they are considerably more expensive to manufacture than the simple turning valve.
  • An air-conditioning system should be made of such a material and designed so that it can function for the design life of the installation.
  • the control valve must therefore be made of material which will withstand gases and other substances in the air flow and the surroundings, and it must also be capable of withstanding certain mechanical stresses. It must be possible to carry out adjustments at any time without the valve jamming or being deformed. For hygienic and functional reasons it should be possible to clean the valve which must be designed in such a way that accumulations of dirt, dust and grease cannot permanently restrict the intended function.
  • the valve may permit a certain air flow even in its most closed position, and in other embodiments it may also be used as a tight-sealing shut-off valve.
  • the present invention also relates to a valve by means of which the aforementioned disadvantages of other types of valve can be eliminated or substantially reduced.
  • valves according to the invention cause substantially less turbulence than previously known valves and also comprise separate means of silencing achieves a reduction in unwanted noise together with a space saving.
  • Valves according to the invention have the characteristic features disclosed in the patent claims.
  • Fig. 1 schematically shows the working of a valve according to the invention.
  • Fig. 2 shows details of a practical embodiment.
  • Fig. 3 shows a part of a sleeve in the valve.
  • Fig. 8 shows the sound propagation directions in a partially restricted valve.
  • Fig. 1 shows the basic working of the valve according to the invention.
  • the air 7 flows through a duct 1 in which a sleeve 2 of elastic, somewhat air-permeable and stretchable material is arranged.
  • the sleeve which in the starting position has the shape of a straight, circular cylinder, is designed at one end to be controllably turned as indicated by the arrow 3. This causes a displacement of one sleeve attachment inwards in the direction indicated by the arrow 6 and a reduction in the diameter of the sleeve inwards towards the centre according to the arrows 4 and 5. This results in a reduced flow through the duct so that the flow inside the sleeve thereby diminishes.
  • the sleeve may be made of many different materials, various textile materials being preferred, examples of suitable materials being polyamide, polyester and other materials having a limited elasticity and stretchability. In certain applications rubber or rubber-like materials may be feasible.
  • a sleeve in the form of a hose of textile material can be manufactured by weaving or braiding. This is preferably designed with a thread alignment parallel with the direction of the duct and a thread alignment at right angles thereto. When one attachment is turned as shown in Fig. 1, the sleeve takes on the appearance shown in Fig. 3, which shows the sleeve cut off a short distance from the flow pipe 8 before the middle of the sleeve.
  • Figs. 4A-6A show the sleeve in various torsional positions viewed in an axial direction
  • Figs. 4B-6B show the sleeve in the same positions viewed in a radial direction.
  • Fig. 6B also shows a schematic view of the thread direction for a sleeve of textile material.
  • Figs. 7 and 8 show cross-sections through a valve according to the invention with sleeve 2 in a tubular duct 22 which is surrounded by insulating, sound-absorbing material 23, which is enclosed by an outer covering 24.
  • the valve is connected to an air duct by the piping connections 25 and 26.
  • the sleeve is fitted to the duct 22 by means of a first fixing ring 18, which is displaceable in the longitudinal direction of the duct, and a second fixing ring 16, which is rotatable in the duct but not displaceable in the longitudinal direction of the duct.
  • the fixing ring 16 is turned by means of an operating device 21 , which may be manual or actuated by a servomotor, for example.
  • the operating device is of a design known in the art and is not shown in detail in the figures.
  • the tubular duct 22 is perforated so that its surface is partially open to the insulation 23.
  • Pressure pipes 17 and 19 may be fitted to the valve and inserted through the casing pipe.
  • the pressure pipes are connected to the air flowing in the duct by slits up against the sleeve fixing rings. This advantageous fitting with a small distance between the measuring points and inco ⁇ orated into the valve unit is possible due to the characteristics obtained with a valve according to the invention.
  • the folds that are formed in the sleeve material act as guide channels for the air and impart a rotary motion thereto through the sleeve. The more the valve is constricted the more pronounced the guide channels become, as therefore does their effect on the air flow.
  • the directions of the sound waves have been indicated by dashed arrows 27. It will be seen from the figures that there is always an air flow into the surrounding insulation material 23.
  • the fact that the sleeve 2 and the duct 22 are both designed so that they are air-permeable means that a silencing function is obtained even with the valve fully opened as in Fig. 7, the unit then functioning as an abso ⁇ tion silencer of conventional type.
  • the device functions both as a combined valve and silencer and as a result has a significantly shorter overall length than a conventional combination of silencer and valve arranged side by side.
  • the sound insulation material also means that the unit meets the fire insulation requirements.
  • valve becomes less dependent on how it is fitted in the ducting system and can therefore be fitted immediately adjacent to a ducting bend, for example, without this affecting the pressure and flow measurement, which has great practical significance since there is almost always insufficient space in a ventilation system.
  • the valve according to the invention may naturally be manufactured in various diameters and lengths.
  • suitable dimensions for many applications is a sleeve 160 mm in diameter and 180 mm in length. Turning through 120 degrees, which may be a suitable maximum angle of rotation, results in a reduction in length of approximately 60 mm, the free area at the centre being reduced by 75-80% compared to the initial state.
  • the controlled formation of folds means that flow around sha ⁇ edges is entirely avoided, which in turn results in a substantially reduced turbulence compared, for example, to an iris valve with the same reduction in area.
  • the folding means that a form of guide channels are created, which guide the air flow and provide a gentle passage between the valve inlet and outlet. With the valve fully open, the inside is plane and the air flow passes without being disturbed by the valve. In all these situations, therefore, the unwanted noise that is generated is less than in other types of valve.
  • the tubular duct and the sleeve must be of air-permeable material which allows the sound waves to pass out to the surrounding sound insulation material. That is to say the air-permeable material must allow air molecules to carry sound waves through the material, but on the other hand it is not necessary for any significant air flow to occur.
  • the tubular duct may be made of perforated sheet metal, for example.
  • the sleeve may be made of various materials, although textile materials are to be preferred for a number of reasons. Textile materials commonly have a certain limited stretchability or elasticity which can give the sleeve a smoother and more even surface in different torsional positions.
  • a woven or braided material may have a certain permeability for the flowing air and a small proportion of the air flow can then occur between the outside of the sleeve and the surrounding casing pipe. This permeability can have an advantageous effect on the flow conditions, can further reduce the noise generated and can eliminate any disturbance of the pressure measurement.
  • the silencing is largely achieved in that the valve is surrounded by an outer casing of sound insulation material in which there may be through openings for the operating device and the pressure measuring pipes.
  • control device may be designed in many different ways as can the sleeve fitting in the surrounding casing pipe.
  • the material in the sleeve may be varied and the characteristics thereof influenced by impregnation, material mixing and other similar measures.

Abstract

The control damper relates to a control valve which is primarily intended for controlling air flow, although the valve may also be used to control other flowing media. The valve comprises a sleeve (2) of flexible material, the cross-section of which largely corresponds to the duct (1, 22) in which the flow occurs, one end of the sleeve being fixed in relation to the duct and the other end thereof being rotatable with displacement in an axial direction that is controlled in proportion to the rotation. When turned, the sleeve (2) assumes a cross-section in the form of a multi-pointed star (13). The valve is surrounded by sound insulation material (23) and the pipe (22) that surrounds the sleeve is air-permeable.

Description

Control damper
The present invention relates to a valve for controlling air flow or other flowing medium. The valve comprises a sleeve of flexible material, one end of which is fixed in relation to the duct in which the flow occurs and the other end of which can be turned with displacement in an axial direction that is controlled in proportion to the rotation. Control valves of the type to which the invention relates are used primarily for controlling the air flow in air conditioning installations and ventilation systems by causing a fall in pressure and for controlling the air flow to individual rooms and proportionately to other rooms within the area of the same ventilation system. In order to achieve this, control valves are fitted at a number of different points within the system. In addition to controlling the flow rates, valves are also used for measuring the pressure drop over the valve, which forms the basis for calculation of the flow rates in the system.
Two different types of known valve are most commonly used for these purposes. The simplest type consists of a disk which is rotatably mounted in the flow duct so that the disk is perpendicular to the direction of flow when the valve is closed. From this position the disk can be rotated about an axis in the plane of the disk and passing though its centre. The ventilation ducts are most commonly sheet metal conduits of circular cross-section and the valve then suitably takes the form of a circular sheet metal plate, the size of which corresponds to the inside diameter of the duct. This type of valve has significant disadvantages due to turbulence in the air flow downstream of the valve, which gives rise to undesirable noise and may distort the measuring conditions for the differential pressure measurement.
Iris valves may be used in order to obtain better air flow conditions. These provide a centred restriction of the air flow, which results in a smoother air flow. Iris valves also have a short overall length. However, iris valves also cause turbulence in that the air in this case, too, must pass over a sharp edge, and they are considerably more expensive to manufacture than the simple turning valve.
It has also been proposed to design a valve function in which the air is made to flow through a sleeve of elastic material which is designed to be constricted at the middle so that the diameter thereof is reduced. In order to achieve a damping of the unwanted noise, which can occur in a ventilation system due to valves or various other causes, separate silencers have been installed in the systems to supplement other components. These silencers take up a relatively large amount of space, firstly since they must cover a certain length of the duct in which they are installed and secondly since they have a larger outside diameter than the rest of the ducting system.
An air-conditioning system should be made of such a material and designed so that it can function for the design life of the installation. The control valve must therefore be made of material which will withstand gases and other substances in the air flow and the surroundings, and it must also be capable of withstanding certain mechanical stresses. It must be possible to carry out adjustments at any time without the valve jamming or being deformed. For hygienic and functional reasons it should be possible to clean the valve which must be designed in such a way that accumulations of dirt, dust and grease cannot permanently restrict the intended function. Unlike shut-off valves, the valve may permit a certain air flow even in its most closed position, and in other embodiments it may also be used as a tight-sealing shut-off valve.
The present invention also relates to a valve by means of which the aforementioned disadvantages of other types of valve can be eliminated or substantially reduced. The fact that valves according to the invention cause substantially less turbulence than previously known valves and also comprise separate means of silencing achieves a reduction in unwanted noise together with a space saving. Valves according to the invention have the characteristic features disclosed in the patent claims.
The invention will be described in more detail below with reference to the examples of embodiment shown in the drawings attached, in which:
Fig. 1 schematically shows the working of a valve according to the invention.
Fig. 2 shows details of a practical embodiment.
Fig. 3 shows a part of a sleeve in the valve.
Figs. 4-6 show the sleeve in various positions of the valve. Fig. 7 shows the sound propagation directions in a fully opened valve.
Fig. 8 shows the sound propagation directions in a partially restricted valve.
Fig. 1 shows the basic working of the valve according to the invention. The air 7 flows through a duct 1 in which a sleeve 2 of elastic, somewhat air-permeable and stretchable material is arranged. The sleeve, which in the starting position has the shape of a straight, circular cylinder, is designed at one end to be controllably turned as indicated by the arrow 3. This causes a displacement of one sleeve attachment inwards in the direction indicated by the arrow 6 and a reduction in the diameter of the sleeve inwards towards the centre according to the arrows 4 and 5. This results in a reduced flow through the duct so that the flow inside the sleeve thereby diminishes.
Fig. 2 shows some major parts of a practical embodiment of the invention. In a circular duct 1 a sleeve of the aforementioned type is fixed on a piping connection 9 and at its other end to a somewhat longer piping connection that constitutes a flow pipe 8. For sealing against the duct 1 and its extension in both directions, the piping connection 9 and the flow pipe 8 have sealing rings 10-13. The piping connection 9 is fixed in relation to the duct 1, whilst the flow pipe 8 is arranged in the duct 1 so that it is longitudinally displaceable. When the flow pipe is turned in the manner described in more detail below, the sleeve 2 is constricted as folding occurs and the sleeve in various positions takes on the appearance shown in Figs. 3 and 4-6. In other embodiments the piping connection 9 may be turned but not displaced in the longitudinal direction of the duct, without any displacement of the flow pipe 8 occurring.
The sleeve may be made of many different materials, various textile materials being preferred, examples of suitable materials being polyamide, polyester and other materials having a limited elasticity and stretchability. In certain applications rubber or rubber-like materials may be feasible. A sleeve in the form of a hose of textile material can be manufactured by weaving or braiding. This is preferably designed with a thread alignment parallel with the direction of the duct and a thread alignment at right angles thereto. When one attachment is turned as shown in Fig. 1, the sleeve takes on the appearance shown in Fig. 3, which shows the sleeve cut off a short distance from the flow pipe 8 before the middle of the sleeve. When turned, the sleeve 2 is folded 2 so that a number of ridges 14 and valleys 15 are formed, which in cross-section form a multi-pointed star 20. This can also be seen from Figs. 4A-6A, which show the sleeve in various torsional positions viewed in an axial direction, and Figs. 4B-6B, which show the sleeve in the same positions viewed in a radial direction. Fig. 6B also shows a schematic view of the thread direction for a sleeve of textile material.
Figs. 7 and 8 show cross-sections through a valve according to the invention with sleeve 2 in a tubular duct 22 which is surrounded by insulating, sound-absorbing material 23, which is enclosed by an outer covering 24. The valve is connected to an air duct by the piping connections 25 and 26. The sleeve is fitted to the duct 22 by means of a first fixing ring 18, which is displaceable in the longitudinal direction of the duct, and a second fixing ring 16, which is rotatable in the duct but not displaceable in the longitudinal direction of the duct. The fixing ring 16 is turned by means of an operating device 21 , which may be manual or actuated by a servomotor, for example. The operating device is of a design known in the art and is not shown in detail in the figures. The tubular duct 22 is perforated so that its surface is partially open to the insulation 23.
Pressure pipes 17 and 19 may be fitted to the valve and inserted through the casing pipe. The pressure pipes are connected to the air flowing in the duct by slits up against the sleeve fixing rings. This advantageous fitting with a small distance between the measuring points and incoφorated into the valve unit is possible due to the characteristics obtained with a valve according to the invention. The folds that are formed in the sleeve material act as guide channels for the air and impart a rotary motion thereto through the sleeve. The more the valve is constricted the more pronounced the guide channels become, as therefore does their effect on the air flow. The rotation is important since it forces the air to follow the circumferential surface of the sleeve, which results in less turbulence, a smaller pressure drop and less generated noise. Less turbulence also makes it possible to measure the pressure and flow more reliably, which is important in modern ventilation systems in which great emphasis is placed on low energy consumption.
In the figures, the directions of the sound waves have been indicated by dashed arrows 27. It will be seen from the figures that there is always an air flow into the surrounding insulation material 23. The fact that the sleeve 2 and the duct 22 are both designed so that they are air-permeable means that a silencing function is obtained even with the valve fully opened as in Fig. 7, the unit then functioning as an absoφtion silencer of conventional type. The more the valve is constricted, the more the fixing ring 18 is displaced inwards towards the middle of the valve, consequently exposing more of the sound-absorbing material to direct contact with the air flow without this first having to pass through the sleeve 2. The device functions both as a combined valve and silencer and as a result has a significantly shorter overall length than a conventional combination of silencer and valve arranged side by side. The sound insulation material also means that the unit meets the fire insulation requirements.
A further important characteristic accruing from the reduced turbulence is that the valve becomes less dependent on how it is fitted in the ducting system and can therefore be fitted immediately adjacent to a ducting bend, for example, without this affecting the pressure and flow measurement, which has great practical significance since there is almost always insufficient space in a ventilation system.
The valve according to the invention may naturally be manufactured in various diameters and lengths. One example of suitable dimensions for many applications is a sleeve 160 mm in diameter and 180 mm in length. Turning through 120 degrees, which may be a suitable maximum angle of rotation, results in a reduction in length of approximately 60 mm, the free area at the centre being reduced by 75-80% compared to the initial state.
The controlled formation of folds means that flow around shaφ edges is entirely avoided, which in turn results in a substantially reduced turbulence compared, for example, to an iris valve with the same reduction in area. As stated above, the folding means that a form of guide channels are created, which guide the air flow and provide a gentle passage between the valve inlet and outlet. With the valve fully open, the inside is plane and the air flow passes without being disturbed by the valve. In all these situations, therefore, the unwanted noise that is generated is less than in other types of valve.
The tubular duct and the sleeve must be of air-permeable material which allows the sound waves to pass out to the surrounding sound insulation material. That is to say the air-permeable material must allow air molecules to carry sound waves through the material, but on the other hand it is not necessary for any significant air flow to occur. For this puφose the tubular duct may be made of perforated sheet metal, for example.
As stated, the sleeve may be made of various materials, although textile materials are to be preferred for a number of reasons. Textile materials commonly have a certain limited stretchability or elasticity which can give the sleeve a smoother and more even surface in different torsional positions. A woven or braided material may have a certain permeability for the flowing air and a small proportion of the air flow can then occur between the outside of the sleeve and the surrounding casing pipe. This permeability can have an advantageous effect on the flow conditions, can further reduce the noise generated and can eliminate any disturbance of the pressure measurement. The silencing is largely achieved in that the valve is surrounded by an outer casing of sound insulation material in which there may be through openings for the operating device and the pressure measuring pipes.
Other embodiments apart from those described are possible without departing from the idea of the invention. The control device may be designed in many different ways as can the sleeve fitting in the surrounding casing pipe. The material in the sleeve may be varied and the characteristics thereof influenced by impregnation, material mixing and other similar measures.

Claims

W 20CLAIMS
1. Valve for controlling air flow or other flowing medium, comprising a sleeve (2) of flexible material, the cross-section of which largely corresponds to the duct (1, 22) in which the flow occurs, one end of the sleeve being fixed in relation to the duct and the other end thereof being rotatable with displacement in an axial direction that is controlled in proportion to the rotation, so that the sleeve (2) in the fully opened position has the shape of a straight circular cylinder and when turned assumes a cross-section in the form of a multi -pointed star (13), characterised in that the material in the sleeve (2) is permeable to the sound waves that are carried by the flowing medium, so that a proportion of the flow occurs between the outside of the sleeve and a surrounding air-permeable pipe (1, 22), which is in turn surrounded by sound insulation material
2. Valve according to Claim 1 , characterised in that the sleeve has a fixed end and a movable end, the moveable end being displaced inside the surrounding pipe (1, 22) when the valve setting is adjusted, so that the more the valve is constricted, the more the surface of the pipe (1, 22) is exposed for direct permeation of sound waves to the insulating material (23).
PCT/SE2002/001595 2001-03-08 2002-09-05 Control damper WO2004023047A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE0100797A SE518776C2 (en) 2001-03-08 2001-03-08 Throttle valve for regulating flow of e.g. air, comprises flexible sleeve with fixed end and rotatable end
AU2002335573A AU2002335573A1 (en) 2002-09-05 2002-09-05 Control damper
EP02807773A EP1546613A1 (en) 2002-09-05 2002-09-05 Control damper
PCT/SE2002/001595 WO2004023047A1 (en) 2001-03-08 2002-09-05 Control damper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0100797A SE518776C2 (en) 2001-03-08 2001-03-08 Throttle valve for regulating flow of e.g. air, comprises flexible sleeve with fixed end and rotatable end
PCT/SE2002/001595 WO2004023047A1 (en) 2001-03-08 2002-09-05 Control damper

Publications (1)

Publication Number Publication Date
WO2004023047A1 true WO2004023047A1 (en) 2004-03-18

Family

ID=32684361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2002/001595 WO2004023047A1 (en) 2001-03-08 2002-09-05 Control damper

Country Status (2)

Country Link
SE (1) SE518776C2 (en)
WO (1) WO2004023047A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010039100A1 (en) * 2008-09-30 2010-04-08 Jerry Borander Air flow adjustment
US9419692B2 (en) 2005-10-24 2016-08-16 Parkervision, Inc. Antenna control
US9614484B2 (en) 2005-10-24 2017-04-04 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including control functions to transition an output of a MISO device
US9833591B1 (en) * 2012-01-04 2017-12-05 Resmed Limited Flow interrupter for respiratory treatment apparatus
EP4109008A1 (en) 2021-06-24 2022-12-28 Jeven Oy Attenuator for air-conditioning duct and method of manufacturing the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1379772A (en) * 1972-04-21 1975-01-08 Mucon Eng Co Ltd Flow control vavles
US4523737A (en) * 1983-03-21 1985-06-18 Honeywell Inc. Sleeve valve actuator means
SU1185006A1 (en) * 1983-11-03 1985-10-15 Предприятие П/Я Г-4152 Flow rate control
EP0334519A2 (en) * 1988-03-18 1989-09-27 Leslie David Norman A flow control member for a flow control valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1379772A (en) * 1972-04-21 1975-01-08 Mucon Eng Co Ltd Flow control vavles
US4523737A (en) * 1983-03-21 1985-06-18 Honeywell Inc. Sleeve valve actuator means
SU1185006A1 (en) * 1983-11-03 1985-10-15 Предприятие П/Я Г-4152 Flow rate control
EP0334519A2 (en) * 1988-03-18 1989-09-27 Leslie David Norman A flow control member for a flow control valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198620, Derwent World Patents Index; Class Q66, AN 1986-129848, XP002986655 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9419692B2 (en) 2005-10-24 2016-08-16 Parkervision, Inc. Antenna control
US9614484B2 (en) 2005-10-24 2017-04-04 Parkervision, Inc. Systems and methods of RF power transmission, modulation, and amplification, including control functions to transition an output of a MISO device
WO2010039100A1 (en) * 2008-09-30 2010-04-08 Jerry Borander Air flow adjustment
US8757201B2 (en) 2008-09-30 2014-06-24 Jerry Borander Air flow adjustment
EP3040589A1 (en) * 2008-09-30 2016-07-06 Acticon AB Air flow adjustment
US9429336B2 (en) 2008-09-30 2016-08-30 Acticon Ab Air flow adjustment
US9833591B1 (en) * 2012-01-04 2017-12-05 Resmed Limited Flow interrupter for respiratory treatment apparatus
EP4109008A1 (en) 2021-06-24 2022-12-28 Jeven Oy Attenuator for air-conditioning duct and method of manufacturing the same

Also Published As

Publication number Publication date
SE0100797D0 (en) 2001-03-08
SE518776C2 (en) 2002-11-19
SE0100797L (en) 2002-09-09

Similar Documents

Publication Publication Date Title
US6439540B1 (en) Butterfly valve noise suppressor
US11333396B2 (en) Supply air device for controlling supply air flow
KR101883458B1 (en) Control butterfly valve
WO1999031415A1 (en) Noise attenuating device for butterfly valves
AU2013217122A1 (en) Pressure reducer
KR101118554B1 (en) A Regulation Valve
EP0861404B1 (en) Fluid control device with reduced sound generation
WO2004023047A1 (en) Control damper
KR101545811B1 (en) Control valve for whirlpool prevention
EP1630486A2 (en) Flap valve arrangement
EP2281131A1 (en) Flow control valve
US6253873B1 (en) Gas guide element with sound-absorbent walls for blocking and damping noise spreading from it into main conduits
US3507354A (en) Sound attenuating air discharge terminal device
JP2872985B2 (en) Low noise ball valve assembly with downstream airfoil insert
KR20150001328U (en) Damper silencer with low noise structure
WO2019058350A1 (en) Silencer for a heating, ventilation, and air conditioning system
EP1546613A1 (en) Control damper
US7185678B1 (en) Orifice plate diffuser
CN210220039U (en) Amortization formula connecting pipe and air conditioner
HRP20231560T1 (en) Gas flow and sound control valve and exhaust gas system
US2713350A (en) Damper
US11698136B1 (en) Valve for vehicle
US20230079980A1 (en) Noise abatement in a venturi valve
CN207815799U (en) A kind of mute cut-off throttle valve
JPH07248151A (en) Air volume regulator

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VC VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2002807773

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 2002807773

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP