EP0592648B1 - A damper device - Google Patents
A damper device Download PDFInfo
- Publication number
- EP0592648B1 EP0592648B1 EP93910520A EP93910520A EP0592648B1 EP 0592648 B1 EP0592648 B1 EP 0592648B1 EP 93910520 A EP93910520 A EP 93910520A EP 93910520 A EP93910520 A EP 93910520A EP 0592648 B1 EP0592648 B1 EP 0592648B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clean
- out door
- damper element
- damper
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Revoked
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/0209—Ducting arrangements characterised by their connecting means, e.g. flanges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/18—Details or features not otherwise provided for combined with domestic apparatus
- F24F2221/186—Details or features not otherwise provided for combined with domestic apparatus combined with a fireplace
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/22—Cleaning ducts or apparatus
Definitions
- This invention relates to a damper device comprising a flow conducting casing and a damper element turnably arranged in the casing, which element is mounted on a detachable clean-out door.
- the damper device is preferably intended for air flow regulation in ventilation arrangements.
- the known embodiment is associated with the primary drawback that the mechanics for the transmission of forces to the damper element for the regulation of the latter gets somewhat complicated.
- a secondary drawback with the known embodiment is that it becomes difficult to arrange measuring terminals for air flow regulation in the clean-out door depending on that the damper element in the form of a blade has to move in relation to the clean-out door.
- a known damper device is the so called throttle damper. These are often marketed with three different types of damper elements in the form of blades, namely sealing, non-sealing and perforated damper blades. From a stocking point of view, this damper device becomes very space demanding, especially for manufacturing companies, which forms a tertiary drawback.
- the present invention intends to indicate a damper device with such a constructive design that the primary drawback discussed above is eliminated or at least reduced.
- this object is obtained through the clean-out door being turnably arranged in relation to the casing and the damper element being connected to the clean-out door to accompany the turning of the latter.
- the secondary drawback above is reduced thanks to measuring terminals being arranged in the clean-out door for static measurement of fall of pressure.
- the quaternary drawback above is reduced thanks to at least one means for increase of fall of pressure being mounted in the area between orifices of the measuring terminals on the bottom side of the clean-out door. Thereby the fall of pressure over the damper device is secured even when the damper element is completely open or almost completely open.
- the damper device comprises a flow conducting casing 1.
- this casing has a curved mantle wall, for instance a cross-section-wise circular one, though this is not necessary.
- the casing 1 is intended to be part of a flow conducting channel, for example a ventilation arrangement, and is intended to be connected to further casing or channel elements at its ends 12, 13, sealing elements 14 arranged at these ends being intended to function sealingly.
- a damper element 2 is turnably arranged in the casing 1 .
- This is mounted on a detachable clean-out door 3. More precisely, the clean-out door 3 is turnably arranged in relation to the casing 1 and the damper element 2 is connected to the clean-out door to accompany the turning of the latter.
- the damper element 2 has a blade like shape and at the bottom it shows a curved portion 15 designed in correspondence with the inner, curved mantle wall of the casing 1.
- the clean-out door 3 seals an opening 16, through which admission into the casing 1 can be obtained at deplaced clean-out door.
- the orifice 16 is defined by a tube portion 17, which adjoins to the casing 1 and preferably extends at an angle, especially almost right angle, to the longitudinal centre axis of the casing 1.
- the casing 1 merges into the tube portion 17 via curved transition portions 18 appearing from Fig 1.
- the damper element 2 will extend a bit up into the tube portion 17 and presents opposite edges 19, which are essentially mutually parallel.
- the clean-out door 3 presents a body portion 20 which is introducible into the tube portion 17 and which, for example, might consist of a plate casing filled with a fire resistant, and suitably also thermally insulating, material, such as mineral wool.
- the clean-out door 3 comprises a mantle 21 designed to externally engage around the tube portion 17 so that the outer end of the latter becomes located between the mantle portion 21 and the body portion 20.
- a sealing means 22 can be mounted to seal between the mantle portion 21 and the tube portion 17.
- the damper element 2 is detachably connected to the clean-out door 3. More exactly, the latter presents members 4 for displaceable engagement with the damper element 2.
- the engagement members 4 consist of slots, into which the damper element runs. Accordingly, different types of damper elements can be mounted on one and the same clean-out door 3 by being displaced into engagement with the slots 4 of the clean-out door.
- the described damper device can also be used during channel cleaning thanks to the damper element being taken away from the clean-out door before the clean-out door is reassembled during the course of cleaning. Extra sealing doors for cleaning are therefore not required.
- Fig 5 an example of a simple, non-sealing, blade like damper element is shown. This has been reinforced thanks to a centrally located folding 16.
- the damper element presents portions 23 for engagement in the engagement members 4 of the clean-out door 3.
- the portions 23 have the character of flaps protruding towards the sides and being insertable in the member 4 designed as slots.
- Fig 6 an example of a sealing damper element is shown, where two single damper blades 17 have an interjacent, sealing packing 18.
- the portions 23 for engagement with the members or slots 4 of the clean-out door consist of parts of the damper blades 17 bent towards opposite sides.
- the damper element 2 will move in the interior of the casing 1 so that a varying degree of flow throttling arises.
- Existing friction for instance with assistance of the sealing means 22, results in the clean-out door remaining in adjusted position.
- the holders 12, 13 are fastened on the out-side of the tube portion 17 and grip with their outer ends around the upper portion of the clean-out door 3.
- the damper device comprises members for restoration of an adjusted flow value after channel cleaning.
- This member suitably comprises a rider 15, which is connected to the clean-out door.
- This rider can be fixed at the tube portion 17, for example by means of a locking screw protruding through the rider and the tube portion 17.
- the measuring terminals 6 and 7 emerge into the bottom side of the clean-out door 3 at 8 and 9 respectively, on either side of the damper element 2, as most clearly appears from Fig 2.
- Each of the measuring terminals 6 and 7 comprises an upper tube portion 24 and a tube 25, which is connected to the tube portion 24 and which extends through the clean-out door 3 and ends with an end portion 26 a bit beneath the bottom side of the clean-out door.
- a transverse means 27 is fastened, which is intended to facilitate the turning of the clean-out door by being gripped by the hands of a present operator.
- this transverse means 27 has the shape of a hollow, cross-section-wise rectangular profile, which upwards shows a recess 28. In this recess 28 a part 29 that includes the tube portions 24 of the measuring terminals 6, 7 is insertable.
- a cover 30 serves for sealing of the upper ends of the tube portions 24 when no measuring of fall of pressure is accomplished.
- This cover 30 might for example be pivotably connected to the part 29 and present suitable locking members to be fixed in relation to the part 29 when being in its closed position sealing the tube portions 24.
- the closed position is shown in Fig 1 and 2.
- the measuring terminals 6, 7 could also be designed as rigid tube sections extending through the clean-out door 3 beside possible manoeuvring means arranged on the latter.
- At least one means 10, 11 for increase of fall of pressure is mounted in the area between the orifices 8, 9 of the measuring terminals 6, 7 on the bottom side of the clean-out door 3.
- This means 10, 11 for increase of fall of pressure is designed as a plate.
- the purpose of the one or more means 10, 11 for increase of fall of pressure is to, at completely or almost completely open damper element 2, work promotively for fall of pressure between the orifices 8, 9 of the measuring terminals 6, 7 on the bottom side of the clean-out door so that a fall of pressure can be measured and the flow amount thereby be settled.
- the described damper device is not just limited to the above described embodiment.
- the essence of the idea of the invention is that the clean-out door 3 shall be turnable in relation to the casing 1, and the damper element 2 so connected to the clean-out door that the turning of the latter gives rise to readjustment of the damper element in the casing 1 and thereby change of the throttling of the damper element of the flow through the casing.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
- This invention relates to a damper device comprising a flow conducting casing and a damper element turnably arranged in the casing, which element is mounted on a detachable clean-out door. The damper device is preferably intended for air flow regulation in ventilation arrangements.
- From the Swedish patent 434 569 a device of the kind mentioned by way of introduction is known since earlier. In this patent, the damper element is turnably hung up in a clean-out door which is detachable. Furthermore, the damper element is fastened to the clean-out door via a manoeuvre shaft.
- The known embodiment is associated with the primary drawback that the mechanics for the transmission of forces to the damper element for the regulation of the latter gets somewhat complicated.
- A secondary drawback with the known embodiment is that it becomes difficult to arrange measuring terminals for air flow regulation in the clean-out door depending on that the damper element in the form of a blade has to move in relation to the clean-out door.
- A known damper device is the so called throttle damper. These are often marketed with three different types of damper elements in the form of blades, namely sealing, non-sealing and perforated damper blades. From a stocking point of view, this damper device becomes very space demanding, especially for manufacturing companies, which forms a tertiary drawback.
- It is previously well known to do measurements of fall of pressure over damper devices for the determination of the flow amount. With dampers of throttle type there is however a quaternary drawback. At completely open damper, the fall of pressure is namely almost zero and accordingly measurement can not be done.
- In the first place, the present invention intends to indicate a damper device with such a constructive design that the primary drawback discussed above is eliminated or at least reduced.
- According to the invention, this object is obtained through the clean-out door being turnably arranged in relation to the casing and the damper element being connected to the clean-out door to accompany the turning of the latter.
- According to the invention, the secondary drawback above is reduced thanks to measuring terminals being arranged in the clean-out door for static measurement of fall of pressure.
- The tertiary drawback above is reduced thanks to the damper element being detachably connected to the clean-out door. Thereby, a certain damper element might be detached from the clean-out door and replaced by another one.
- The quaternary drawback above is reduced thanks to at least one means for increase of fall of pressure being mounted in the area between orifices of the measuring terminals on the bottom side of the clean-out door. Thereby the fall of pressure over the damper device is secured even when the damper element is completely open or almost completely open.
- Further preferred characteristics of the damper device according to the invention become clear from the following patent claims and the description.
- With reference to enclosed drawings, a shorter description of an embodiment of the invention, stated as an example, follows below.
- In the drawings:
- Fig 1 is a schematic side view of the damper device in open position,
- Fig 2 is a view of the damper device, regarded according to the line A in Fig 1,
- Fig 3 is a view of the damper device, regarded from the line B in Fig 1,
- Fig 4 is a side view of the clean-out door of the damper device, regarded from the line C in Fig 2,
- Fig 5 is a perspective view of a non-sealing, blade like damper element, and
- Fig 6 is a perspective view of a sealing, blade like damper element.
- The damper device according to the invention comprises a
flow conducting casing 1. In the example, this casing has a curved mantle wall, for instance a cross-section-wise circular one, though this is not necessary. Thecasing 1 is intended to be part of a flow conducting channel, for example a ventilation arrangement, and is intended to be connected to further casing or channel elements at itsends elements 14 arranged at these ends being intended to function sealingly. In the casing 1 adamper element 2 is turnably arranged. This is mounted on a detachable clean-outdoor 3. More precisely, the clean-outdoor 3 is turnably arranged in relation to thecasing 1 and thedamper element 2 is connected to the clean-out door to accompany the turning of the latter. - The
damper element 2 has a blade like shape and at the bottom it shows acurved portion 15 designed in correspondence with the inner, curved mantle wall of thecasing 1. - The clean-out
door 3 seals anopening 16, through which admission into thecasing 1 can be obtained at deplaced clean-out door. In the example, theorifice 16 is defined by atube portion 17, which adjoins to thecasing 1 and preferably extends at an angle, especially almost right angle, to the longitudinal centre axis of thecasing 1. Thecasing 1 merges into thetube portion 17 viacurved transition portions 18 appearing from Fig 1. - In the example, the
damper element 2 will extend a bit up into thetube portion 17 and presentsopposite edges 19, which are essentially mutually parallel. - In the example the clean-out
door 3 presents abody portion 20 which is introducible into thetube portion 17 and which, for example, might consist of a plate casing filled with a fire resistant, and suitably also thermally insulating, material, such as mineral wool. In the example, the clean-outdoor 3 comprises amantle 21 designed to externally engage around thetube portion 17 so that the outer end of the latter becomes located between themantle portion 21 and thebody portion 20. On themantle portion 21 or, as in the illustrated example, on thetube portion 17, a sealing means 22 can be mounted to seal between themantle portion 21 and thetube portion 17. - The
damper element 2 is detachably connected to the clean-outdoor 3. More exactly, the latter presentsmembers 4 for displaceable engagement with thedamper element 2. Theengagement members 4 consist of slots, into which the damper element runs. Accordingly, different types of damper elements can be mounted on one and the same clean-outdoor 3 by being displaced into engagement with theslots 4 of the clean-out door. - The described damper device can also be used during channel cleaning thanks to the damper element being taken away from the clean-out door before the clean-out door is reassembled during the course of cleaning. Extra sealing doors for cleaning are therefore not required.
- In Fig 5, an example of a simple, non-sealing, blade like damper element is shown. This has been reinforced thanks to a centrally located folding 16. The damper element presents
portions 23 for engagement in theengagement members 4 of the clean-outdoor 3. In the example, theportions 23 have the character of flaps protruding towards the sides and being insertable in themember 4 designed as slots. In Fig 6 an example of a sealing damper element is shown, where twosingle damper blades 17 have an interjacent, sealingpacking 18. Here, theportions 23 for engagement with the members orslots 4 of the clean-out door consist of parts of thedamper blades 17 bent towards opposite sides. - During turning of the clean-out
door 3 in relation to thetube portion 17, thedamper element 2 will move in the interior of thecasing 1 so that a varying degree of flow throttling arises. Existing friction, for instance with assistance of the sealing means 22, results in the clean-out door remaining in adjusted position. To lock the clean-outdoor 3 at thecasing 1, there are two clamp-shaped and suitablyelastic holders damper element 2 with assistance of thescale 14 on themantle portion 21 of the clean-outdoor 3. Theholders tube portion 17 and grip with their outer ends around the upper portion of the clean-outdoor 3. - The damper device comprises members for restoration of an adjusted flow value after channel cleaning. This member suitably comprises a
rider 15, which is connected to the clean-out door. This rider can be fixed at thetube portion 17, for example by means of a locking screw protruding through the rider and thetube portion 17. - In the clean-out
door 3 there are two measuringterminals damper element 2 and adjusted flow amount. The flow amount is proportional to the throttle degree on thescale 14 and current fall of pressure. - The
measuring terminals door 3 at 8 and 9 respectively, on either side of thedamper element 2, as most clearly appears from Fig 2. - Each of the
measuring terminals upper tube portion 24 and a tube 25, which is connected to thetube portion 24 and which extends through the clean-outdoor 3 and ends with an end portion 26 a bit beneath the bottom side of the clean-out door. Above the upper side of the clean-out door 3 a transverse means 27 is fastened, which is intended to facilitate the turning of the clean-out door by being gripped by the hands of a present operator. In the example this transverse means 27 has the shape of a hollow, cross-section-wise rectangular profile, which upwards shows arecess 28. In this recess 28 apart 29 that includes thetube portions 24 of themeasuring terminals cover 30 serves for sealing of the upper ends of thetube portions 24 when no measuring of fall of pressure is accomplished. Thiscover 30 might for example be pivotably connected to thepart 29 and present suitable locking members to be fixed in relation to thepart 29 when being in its closed position sealing thetube portions 24. The closed position is shown in Fig 1 and 2. - The
measuring terminals door 3 beside possible manoeuvring means arranged on the latter. - At least one means 10, 11 for increase of fall of pressure is mounted in the area between the
orifices 8, 9 of themeasuring terminals door 3. This means 10, 11 for increase of fall of pressure is designed as a plate. - For each of the
orifices 8, 9 of the measuring terminals there is anown means plates damper element 2 to the outer edge of the clean-outdoor 3. - The purpose of the one or more means 10, 11 for increase of fall of pressure is to, at completely or almost completely
open damper element 2, work promotively for fall of pressure between theorifices 8, 9 of themeasuring terminals - The described damper device is not just limited to the above described embodiment. For example, it would be possible to design the
damper element 2 as firmly associated with the clean-outdoor 3 instead of making the damper element detachable. The essence of the idea of the invention is that the clean-outdoor 3 shall be turnable in relation to thecasing 1, and thedamper element 2 so connected to the clean-out door that the turning of the latter gives rise to readjustment of the damper element in thecasing 1 and thereby change of the throttling of the damper element of the flow through the casing.
Claims (9)
- A damper device especially for flow regulation of ventilation arrangements, comprising a flow conducting casing (1) and a damper element (2) turnably arranged in the casing, which element is mounted on a detachable clean-out door (3),
characterized in that the clean-out door (3) is turnably arranged in relation to the casing (1) and that the damper element (2) is connected to the clean-out door to accompany the turning of the latter. - A device according to claim 1,
characterized in that measuring terminals (6, 7) are arranged in the clean-out door (3) for static measuring of fall of pressure. - A device according to any of claims 1 and 2,
characterized in that the damper element (2) is detachably connected to the clean-out door (3). - A device according to claim 3,
characterized in that the clean-out door (3) presents members (4) for displaceable engagement with the damper element (2). - A device according to claim 4,
charactenzed in that the engaging members (4) consist of slots, in which the damper element runs. - A device according to claim 2,
characterized by at least one means (10, 11) for increase of fall of pressure mounted in the area between orifices (8, 9) of the measuring terminals (6, 7) on the bottom side of the clean-out door (3). - A device according to claim 6,
characterized in that the means (10, 11) for increase of fall of pressure is designed as plate. - A device according to claim 6 or 7,
characterized in that for each measuring terminal (6, 7) respectively, there is an own means (10, 11) for increase of fall of pressure. - A device according to claim 7 or 8,
characterized in that the plate (10, 11) for increase of fall of pressure extends from the damper element (2) to the outer edge of the clean-out door (3).
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9201479A SE505047C2 (en) | 1992-05-11 | 1992-05-11 | Damper for air flow regulation of ventilator |
SE9201479 | 1992-05-11 | ||
SE9301245A SE505046C2 (en) | 1993-04-16 | 1993-04-16 | Damper for air flow regulation of ventilator |
SE9301245 | 1993-04-16 | ||
PCT/SE1993/000413 WO1993023711A1 (en) | 1992-05-11 | 1993-05-11 | A damper device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0592648A1 EP0592648A1 (en) | 1994-04-20 |
EP0592648B1 true EP0592648B1 (en) | 1996-02-21 |
Family
ID=26661415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93910520A Revoked EP0592648B1 (en) | 1992-05-11 | 1993-05-11 | A damper device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0592648B1 (en) |
DE (1) | DE69301595T2 (en) |
NO (1) | NO179564C (en) |
WO (1) | WO1993023711A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114811788B (en) * | 2022-06-22 | 2022-09-02 | 山东海筑暖通工程有限公司 | Household air conditioner purifying and ventilating device with self-cleaning function |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2589176A (en) * | 1946-04-11 | 1952-03-11 | Wheatley Thomas | Valve assembly |
US2902254A (en) * | 1956-12-28 | 1959-09-01 | Rust Furnace Company | Butterfly type valve |
US3938553A (en) * | 1973-11-08 | 1976-02-17 | Robert Ortega | Valve construction |
SE442903B (en) * | 1980-11-10 | 1986-02-03 | Lindab Ventilation Ab | DISTRIBUTION OR DISTRIBUTION PIPE IN VENTILATION CHANNEL |
SE444853B (en) * | 1983-10-24 | 1986-05-12 | Lindab Ventilation Ab | A fire damper |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2755177C3 (en) * | 1977-12-10 | 1983-04-28 | Bernhard 8071 Lenting Kessel | Cleaning pipe |
SE423269B (en) * | 1978-05-08 | 1982-04-26 | Wallberg Kurt Ake | SET TO PROVIDE AN ADJUSTABLE FLOOD LIMIT VALVE ORGANIZATION BY A PIPE, EQUIPMENT FOR EXTENDING THE SET |
SE434569B (en) * | 1980-08-12 | 1984-07-30 | Lindab Ventilation Ab | DEVICE FOR VENTILATION SYSTEMS |
-
1993
- 1993-05-11 WO PCT/SE1993/000413 patent/WO1993023711A1/en not_active Application Discontinuation
- 1993-05-11 EP EP93910520A patent/EP0592648B1/en not_active Revoked
- 1993-05-11 DE DE69301595T patent/DE69301595T2/en not_active Revoked
-
1994
- 1994-01-04 NO NO940022A patent/NO179564C/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2589176A (en) * | 1946-04-11 | 1952-03-11 | Wheatley Thomas | Valve assembly |
US2902254A (en) * | 1956-12-28 | 1959-09-01 | Rust Furnace Company | Butterfly type valve |
US3938553A (en) * | 1973-11-08 | 1976-02-17 | Robert Ortega | Valve construction |
SE442903B (en) * | 1980-11-10 | 1986-02-03 | Lindab Ventilation Ab | DISTRIBUTION OR DISTRIBUTION PIPE IN VENTILATION CHANNEL |
SE444853B (en) * | 1983-10-24 | 1986-05-12 | Lindab Ventilation Ab | A fire damper |
Non-Patent Citations (2)
Title |
---|
SPIRODAMPER, Spiro International Group, p. 11 * |
VENTILATION - 88, Lindab, p. 22-23, 36-37, 1988 * |
Also Published As
Publication number | Publication date |
---|---|
NO940022L (en) | 1994-03-11 |
NO940022D0 (en) | 1994-01-04 |
DE69301595T2 (en) | 1996-07-11 |
EP0592648A1 (en) | 1994-04-20 |
DE69301595D1 (en) | 1996-03-28 |
NO179564C (en) | 1999-08-30 |
NO179564B (en) | 1996-07-22 |
WO1993023711A1 (en) | 1993-11-25 |
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