WO1986005107A1 - Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu - Google Patents

Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu Download PDF

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Publication number
WO1986005107A1
WO1986005107A1 PCT/FI1985/000018 FI8500018W WO8605107A1 WO 1986005107 A1 WO1986005107 A1 WO 1986005107A1 FI 8500018 W FI8500018 W FI 8500018W WO 8605107 A1 WO8605107 A1 WO 8605107A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
fire damper
shaft
arrester
closing plate
Prior art date
Application number
PCT/FI1985/000018
Other languages
English (en)
Inventor
Eero Taimisto
Original Assignee
Eero Taimisto
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eero Taimisto filed Critical Eero Taimisto
Priority to EP85901446A priority Critical patent/EP0214960B1/fr
Priority to PCT/FI1985/000018 priority patent/WO1986005107A1/fr
Publication of WO1986005107A1 publication Critical patent/WO1986005107A1/fr
Priority to NO86864329A priority patent/NO164076C/no

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/24—Operating or controlling mechanisms
    • A62C2/241—Operating or controlling mechanisms having mechanical actuators and heat sensitive parts
    • A62C2/245—Operating or controlling mechanisms having mechanical actuators and heat sensitive parts with thermostatic elements, e.g. bimetallic, resettable actuators
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • F24F11/35—Responding to malfunctions or emergencies to fire, excessive heat or smoke by closing air passages

Definitions

  • the present invention relates to an apparatus for adjusting and releasing a fire damper, which fire damper can be installed in a ventilation duct or equivalent and comprises a housing and a closing plate or an equivalent member fitted therein whereby the duct can be closed.
  • the said apparatus is particularly suited for opening and closing a plate-type fire damper or the like which is placed within a ventilation duct.
  • the invention also relates to an apparatus for operating a fire damper, the said fire damper comprising a housing, a duct leading through the housing and a plate, grate or equivalent closing member, which is installed within the duct and adjusted in its open-position, in which case the duct is left open, and which closing member is released to- trigger off into its closed position by means of the operating apparatus, in which position the duct is tightly closed.
  • the said operating apparatus is particularly well suited to be employed as a remote manipulator for a fire damper .
  • Fire dampers are used in ventilation ducts in order to shut separate parts of a building off for instance in the case of fire emergency. By aid of the fire dampers, the fire is prevented from spreading from the ignition point into other parts of the building via ventilation ducts.
  • the object of the present invention is to achieve a fire damper operating device which is simple, versatile and secure in operation. Moreover, the operating device is easily connectable to any type of fire damper where the closing member can be released by means of pressing or pulling a press key or the like located outside the fire damper housing.
  • the object of the present invention is to achieve an apparatus for adjusting and releasing a fire damper, which apparatus is, among other things, easily reset from outside the damper housing.
  • the essential novel features of the apparatus for adjusting and releasing a fire damper according to the invention are enlisted in the appended patent claims 1-4.
  • the advantages pertaining to the fire damper adjusting and releasing apparatus of the invention include a structure which is simple and secure in operation. The operation can be easily tested from outside the ventilation duct and the fire damper by means of the adjusting lever of the closing plate and the press key of the arrester.
  • the fact that the employed thermal release device is a spring which changes its form according to a change in the temperature ensures that the apparatus can be used continuously without maintenance.
  • the fire damper can be connected to a remote manipulating system, control unit or equivalent.
  • the apparatus of the invention can be operated either manually or by means of an electric and/or pressure impulse.
  • the same operating apparatus can be employed both in fire-risk facilities and in ordinary facilities irrespective of the type of control unit in question.
  • the operating apparatus can be connected to a multitude of fire dampers with utterly different constructions. The only precondition is that the release operation can be effected by means of a slight mechanical movement.
  • Figure 2 shows the fire damper of figure 1 in cross-section along the line A-A
  • Figure 3 shows the fire damper adjusting and releasing apparatus of figure 1 in partial cross-section and without the operating apparatus;
  • Figure 4 shows the apparatus of figure 3 in cross-section along the line B-B;
  • Figure 5 illustrates the fire damper operating apparatus of the invention in partial cross-section;
  • Figure 6 illustrates another operating apparatus of the invention in partial cross-section;
  • Figure 7 illustrates a joining member whereby the operating apparatus of the invention is attached to the fire damper .
  • the fire damper 1 installed in a ventilation duct comprises the housing 3, the duct 2 leading through the housing 3, which duct is associated with the ventilation duct, and the closing plate 4, whereby the ventilation duct can be closed.
  • the closing plate 4 is geared to the housing 3 by aid of the axis 5.
  • the locking springs 6 At both ends of the axis 5, in between the axis and the housing, there are attached the locking springs 6.
  • One end of the axis 5 penetrates the housing 3 and is formed to serve as the lever 7, which is employed for turning the closing plate
  • the closing plate 4 of the fire damper is, according t ⁇ the drawing,, provided with a catch 8-, which in this case is a catch wheel. Most advantageously it forms a half-cir-cle or equivalent circle segment, at the edge or the like whereof there is at least one notch 9 or recess, or several notches at desired intervals, as is apparent from figure 4.
  • the housing 3 of the fire damper 1 is provided with the adjusting and releasing member 10 of the closing plate 4.
  • the said member comprises the movable arrester 11 proper, the stationary shell 14 thereof, the flange 15 or equivalent member which is connected to the arrester 11, and the bottom plate 16 which rests movably around the arrester against the shell 14, the spring 17 being located therebetween, as well as the press key 18 or equivalent attached to the external end of the housing 3 of the fire damper, and further the counterspring 20 fitted between the shoulder 19 of the shell 14 and a separate catch or press key 18 connected to the arrester 11.
  • the arrester 11 has the form of a straight, cylinder-like object provided with a slot or annular groove 13. It is fitted to move within the sleeve-like shell 14 attached to the housing 3 of the fire damper 1, in transversal position with respect to the catch wheel 8, at the distance of the radius r from the turning axis 5 of the closing plate 4.
  • the fire damper 1 functions as follows.
  • the closing plate 4 of the fire damper is adjusted or released by turning the axis 5 by aid of the lever 7 exterior to the fire damper and by simultaneously pressing the press key 18 located at the end of the adjusting and releasing member 10. Now the groove 13 of the arrester 11 is shifted to meet the catch wheel 8.
  • the press key 18 34 in figure 1
  • the arrester 11 is returned into its normal " rest position by aid of the counterspring 20.
  • the locking member 12 of the arrester 11 is placed in the notch 9 located in the catgh wheel , and the closing plate 4, is locked into the respective open position.
  • the closing plate 4 of the fire damper 1 is closed by means of the locking springs 6 located on the axis 5 immediately when the position of the arrester 11 inside the arrester shell 14 holding the catch wheel 8 is axially changed, for instance by pressing the press key 18, so that the slot 13 of the arrester 11 is shifted to meet the catch wheel 8.
  • the catch wheel 8 is released, the fire damper is triggered off and the locking springs 6 lock the closing plate 4 of the fire damper.
  • the axial power Fi (figure 3) directed to the arrester 11, and the closing of the closing plate 4 of the fire damper 1, can be effected, apart from manual operation as in the above description, i.e. by pressing the press key 18 and/or the arrester 11, also in many other ways.
  • a spring 17 at one end of the arrester 11.
  • the said spring 17 is manufactured of a memory metal or a memory metal alloy, such as a copper-zinc-aluminium alloy.
  • the said change in this case meaning that the spring 17 is lengthened between 20...40 % in the axial direction of the arrester 11 - there is needed a 10°...20 ⁇ C change in the temperature, which change may fall anywhere between +150 ⁇ C and -100°C. Consequently, the fire damper can be closed automatically on the basis of the temperature of the air flowing in the ventilation duct.
  • FIG. 5 illustrates, in simplified form, a preferred embodiment of the fire damper operating apparatus of the invention.
  • the operating apparatus 21 comprises the tubular shell 22 and the first and second end plates 26 and 27.
  • a movable shaft 23 or equivalent elongate member On the axis of the shell 22 there is fitted a movable shaft 23 or equivalent elongate member, the first end whereof is connected to the releasing device of the closing member of the fire damper, such as the adjusting and releasing member 10 of the closing plate 4.
  • the intermediary shell 24 Inside the shell 22, there is fitted the intermediary shell 24.
  • the plate 25 or equivalent member which is arranged inside the space 28 defined by the intermediary shell 24 and the first end plate 26.
  • the said space 28 forms the cylinder chamber, and the said plate 25 serves as the piston to be moved within the cylinder chamber.
  • the pressure control connection 29 is coupled to the cylinder chamber 28. At least the part 23a of the shaft 23 is made of a ferromagnetic material such as iron. Inside the intermediary shell 24 there can be fitted the coil 30 which can be coupled to the elctric control connection 31. It is pointed out that the coil can be added to the operating apparatus whenever necessary. First the apparatus can be pressure-operated, but later it is easily provided with the intermediary shell 24 furnished with the coil 30 and coupled to the control unit by means of the electric control connection 31.
  • the above described operating apparatus of the invention is advantageously complemented so that in between the plate 25 serving as the piston and the intermediary shell 24 there is arranged a return spring 32 for the shaft 23.
  • the spring can naturally be placed in any suitable location between the shell or a member immediately attached thereto, such as the intermediary shell or the end plate, and the movable shaft 23.
  • the bracket 33 which limits the returning motion of the spring 32 and by aid of -which the dimension of the motion of the shaft 23 can be • appropriately chosen.
  • the said bracket 33 also defines the static volume of the cylinder chamber 28.
  • the shaft 23 can be axially continued, parallel to the shell 22, through the end plate 26.
  • the continuation of the shaft 23 can easily be furnished with a manual press key 34, as is illustrated by the dotted lines in figure 5.
  • the cylinder chamber 28 located between the intermediary shell 24 and the end plate 26 can also be formed by means of a separate auxiliary sleeve. This helps to make the chamber more compact and to improve the operation of the pressure cylinder.
  • the intermediary shell 24 and the auxiliary sleeve can also be connected to form a uniform member, as will be described in more detail below.
  • Figure 6 is a detailed illustration of another fire damper operating apparatus which enables the fire damper to be operated from a remote control point either by aid of pressure or electric impulses, or even by aid of both.
  • the operating apparatus 21 advantageously comprises the tubular shell 22, the various control connections 29, 31 and 34, the end plates 26 and 27 as well as the joining sleeve 35.
  • the control connection 29 is designed for a pressurized medium such as pressure air
  • the connection 34 is a manual press key
  • the connection 29 is designed for electric control.
  • the joining sleeve 35 is attached, with respect to the manual press key, to the opposite end of the frame 22 so that it extends to the interior of the frame 22 and forms a sliding surface for. the shaft 23 * .
  • the shaft 23 is formed of three parts: the shaft 36 is attached in a stationary fashion, for instance by means of thereadings, to the core 37, at the other end whereof there is attached the shaft
  • the plate 25 is attached in between the shaft 38 and the core 37, and it serves as the piston.
  • the intermediary shell 39 In between the end plates 26 and 27 there is located the intermediary shell 39.
  • the length of the intermediary shell corresponds to the interior of the shell 22 of the operating apparatus, and the first part thereof is formed as a coil housing, around which the coil 45 is wound, and the second part thereof is formed as an intermediary sleeve, which defines the cylinder chamber.
  • the extension 40 i.e. the cylinder chamber, whereinto the plate 25 is fitted.
  • the outer circumference of the plate 25, which is advantageously polished in order to improve the tightening effect required of the piston, functions in cooperation with the inner surface of the extension 40 of the intermediary shell 39.
  • the pressure connection 29 opens into the extension 40 i.e. the space defined by the end plate 26, the plate 25, the intermediary• shell 39 and the sleeve 41.
  • the excess pressure pushes the plate 25, the core 37 and the shaft 36 to the left, against the force of the spring 32.
  • the length of the working impact is limited by the control member 42 of the joining sleeve 35.
  • the axial extension 40 of the intermediary shell 39 is arranged in the first end of the intermediary shell, whereas the groove 44 located around the intermediary shell is arranged at the other, opposite end of the said intermediary shell.
  • the coil 45 In the groove 44 there is fitted the coil 45.
  • the ends of the coil 45 are connected, via the electric connection 31, to suitable power source, the voltage being advantageously 24 V.
  • the intermediary shell 39 is made of an insulatable material such as plastic.
  • the shell 22, the core 37, the joining sleeve 35 and at least one of the end plates 27 are made of a ferromagnetic material such as iron. It is advantageous if also the other end plate 26 and the shaft 38 are made of the same material.
  • the electromagnetic effect of the current flowing in the coil 45 to the core 37 and thereby to the shaft 23 is intensified in the following manner.
  • the diameter of the core 37, located axially in the middle of the shaft 23, is larger than the diameter of the shaft 36.
  • the joining sleeve 35 and the core 37 are matched so that the other end of the joining sleeve 35, which end is located nearer to the core 37, is extended in order to form a control member 42 which is larger than the diameter of the shaft 23.
  • the shoulder 43 there is located the shoulder 43, the lenght whereof is at least equal to the allowed length of the motion of the shaft 23.
  • the corresponding end of the core 37 is furnished with a narrower part 37a, which fits tightly into the control member 42.
  • the narrower part 37a is equally long or slightly longer than the shoulder 43. This construction ensures that the size of the air inlet between the core 37 and the joining sleeve 35 is maintained constant no matter in which working position the shaft 36 is, and even if the magnetic circuit losses are minimized.
  • the operating apparatus of the fire damper of the invention When run by electricity, the operating apparatus of the fire damper of the invention functions as follows. When a sufficiently powerful electricity source is for a while connected, via the poles of the electric control connection 31, to the coil 45, the iron elements located within the shell 22 are shifted to the left, against the force of the spring 32, and simultaneously press the release device of the closing plate 4 of the fire damper by intermediation of the shaft 36, and thus release the closing plate 4 into closed postion. With pressure control, the apparatus functions in a corresponding fashion.
  • FIG. 7 illustrates the joining piece 46, whereby the operating apparatus 21 is attached to the fire damper 1.
  • the joining piece 46 replaces the sleeve-like shell piece 14.
  • the threaded part 47 of the joining piece 46 fits into the joining sleeve 35 of the operating apparatus 21, wherefore the respective pieces can be interconnected by. means of screwing.
  • As for the joining piece 46 its other end is pushed, as far as the collar 48, into the housing 3 of the fire damper 1.
  • the slot 49 of the joining piece 46 corresponds to the slot or annular groove seen in the shell piece 14, in which groove the catch wheel 8 is free to rotate .
  • Typical of the construction of the nvention is its versatility and its security in operation. It can be . operated for example by Halon gas of by pressurized air. It may be arranged to function by means of a specific, heat-sensi ive spring 17, or the spring can be replaced by a wax fuse and a conventional spring. Furthermore, electric impulses can be given in order to trigger off the closing member of the fire damper. At the same time it has been possible to maintain the simplest manner of operation, i.e. manual operation.
  • a particularly advantageous feature of the fire damper operating apparatus of the invention is its adaptability for electric drive. While the control unit surveys the conditions of various fire dampers, it is possible also to control the operational conditions of the whole system. By feeding a slight idle current to the coil of each operating apparatus, any defects in the system can be detected. If the current fed into a certain coil stops it is very likely that the supply line is cut off. On the other hand, an unexpected rise in the current is a signal of either a short circuit of the closing of the fire damper, in which case it is anyway necessary to find out what the problem is. The closing of several fire dampers is carried out by sending the electric impulses successively for instance at the intervals of 1 ms.
  • the adjusting and release apparatus of the invention has been described mainly with reference to one preferred embodiment thereof, but -it .is obvious that many modifications are possible within the scope of the present inventional idea.
  • the apparatus can be adapted for a fire damper which has a cross-sectional form other than a circle, and apart from closing plates, other types of closing devices can also be employed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Inorganic Insulating Materials (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Recrystallisation Techniques (AREA)

Abstract

L'appareil de réglage et de déclenchement est particulièrement approprié pour l'ouverture et la fermeture d'un clapet coupe-feu du type plastique monté dans un conduit de ventilation, et l'appareil de commande (21) est approprié pour être utilisé comme manipulateur à distance du clapet coupe-feu. Le clapet coupe-feu comporte un logement (3) avec une plaque de fermeture (4) située à l'intérieure et permettant la fermeture du conduit de ventilation. La plaque de fermeture (4) est en prise avec le logement (3) via un axe (5) comportant à chacune de ses extrémités des ressorts de verrouillage (6). L'appareil de réglage et de déclenchement comprend un dispositif d'arrêt (8) fixé sur la plaque de fermeture (4), lequel dispositif d'arrêt est une plaque en arc de cercle pourvue de crans (9) à sa périphérie, et l'organe de réglage et de déclenchement (10) de la plaque de fermeture (4) du clapet coupe-feu, lequel organe est muni d'un arrêt se déplaçant à l'intérieur d'une structure analogue à un manchon. A l'aide d'un cran (9) ménagé dans le dispositif d'arrêt (8), l'arrêt verrouille la plaque de fermeture (4) du clapet coupe-feu dans la position désirée. En liaison avec l'arrêt est prévu un ressort (17) en métal dont la forme se modifie dans une certaine plage de température. Au moyen du ressort (17), le clapet coupe-feu se ferme automatiquement à une température donnée du flux d'air. L'appareil de commande (21) comprend un corps tubulaire (22) avec un arbre mobile monté à l'intérieur. La première extrémité de l'arbre est reliée à l'appareil de réglage et de déclenchement, l'autre extrémité étant dotée d'une touche manuelle (34). A l'intérieur du corps (22) est situé un piston relié à l'arbre, et une chambre de vérin à une connexion (29) de commande de pression. A l'intérieur du corps (22) peut également être monté un bobinage couplé à une connexion (31) de commande électrique.
PCT/FI1985/000018 1985-03-01 1985-03-01 Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu WO1986005107A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP85901446A EP0214960B1 (fr) 1985-03-01 1985-03-01 Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu
PCT/FI1985/000018 WO1986005107A1 (fr) 1985-03-01 1985-03-01 Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu
NO86864329A NO164076C (no) 1985-03-01 1986-10-30 Anordning for innstilling og frigjoering av et brannspjeld.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1985/000018 WO1986005107A1 (fr) 1985-03-01 1985-03-01 Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu

Publications (1)

Publication Number Publication Date
WO1986005107A1 true WO1986005107A1 (fr) 1986-09-12

Family

ID=8556375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1985/000018 WO1986005107A1 (fr) 1985-03-01 1985-03-01 Appareil pour regler et declencher un clapet coupe-feu et appareil de commande d'un clapet coupe-feu

Country Status (3)

Country Link
EP (1) EP0214960B1 (fr)
NO (1) NO164076C (fr)
WO (1) WO1986005107A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6991536B2 (en) 2000-12-01 2006-01-31 Kent Tooling And Components Limited Air flow controller and fire damper in an air flow duct
GB2421686A (en) * 2002-08-19 2006-07-05 Kent Tooling & Components Ltd Fire Damper
CN103174856A (zh) * 2013-03-21 2013-06-26 迁安市科技发展促进中心 烟气流量控制阀
WO2013121168A1 (fr) * 2012-02-17 2013-08-22 Flakt Woods Limited Appareil modulaire de déplacement d'air

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20196102A1 (fi) * 2019-12-19 2021-06-20 Flaektgroup Sweden Ab Ilmastointikanavayksikkö

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1125416A (en) * 1914-06-10 1915-01-19 David S Watson Heat-controlled damper for heater-pipes.
US1352255A (en) * 1920-05-06 1920-09-07 Emerson Victor Lee Safety-damper for oil-stills and the like
US2242738A (en) * 1941-05-20 Damper device
DE2609449A1 (de) * 1976-03-06 1977-09-08 Ltg Lufttechnische Gmbh Feuerschutzvorrichtung
US4060096A (en) * 1975-07-02 1977-11-29 Max Gunter Schade Ventilator valve
NO148700B (no) * 1980-07-10 1983-08-22 Per Bj Simble Anordning ved brannspjeld for montering i ventilasjonskanal
WO1984001906A1 (fr) * 1982-11-12 1984-05-24 Halton Oy Coupe-circuit pour limiteurs de feu ou autres dispositifs de securite dans des installations de ventilation
WO1984001907A1 (fr) * 1982-11-12 1984-05-24 Halton Oy Dispositif de commande/etouffement de feu pour gaines dans des installations de ventilation

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242738A (en) * 1941-05-20 Damper device
US1125416A (en) * 1914-06-10 1915-01-19 David S Watson Heat-controlled damper for heater-pipes.
US1352255A (en) * 1920-05-06 1920-09-07 Emerson Victor Lee Safety-damper for oil-stills and the like
US4060096A (en) * 1975-07-02 1977-11-29 Max Gunter Schade Ventilator valve
DE2609449A1 (de) * 1976-03-06 1977-09-08 Ltg Lufttechnische Gmbh Feuerschutzvorrichtung
NO148700B (no) * 1980-07-10 1983-08-22 Per Bj Simble Anordning ved brannspjeld for montering i ventilasjonskanal
WO1984001906A1 (fr) * 1982-11-12 1984-05-24 Halton Oy Coupe-circuit pour limiteurs de feu ou autres dispositifs de securite dans des installations de ventilation
WO1984001907A1 (fr) * 1982-11-12 1984-05-24 Halton Oy Dispositif de commande/etouffement de feu pour gaines dans des installations de ventilation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6991536B2 (en) 2000-12-01 2006-01-31 Kent Tooling And Components Limited Air flow controller and fire damper in an air flow duct
GB2421686A (en) * 2002-08-19 2006-07-05 Kent Tooling & Components Ltd Fire Damper
GB2421686B (en) * 2002-08-19 2007-02-21 Kent Tooling & Components Ltd Thermally-actuated cartridge and fire damper
US7530891B2 (en) 2002-08-19 2009-05-12 Kent Tooling & Components Limited Thermally-actuated cartridge and fire damper
WO2013121168A1 (fr) * 2012-02-17 2013-08-22 Flakt Woods Limited Appareil modulaire de déplacement d'air
CN103174856A (zh) * 2013-03-21 2013-06-26 迁安市科技发展促进中心 烟气流量控制阀

Also Published As

Publication number Publication date
NO164076B (no) 1990-05-21
EP0214960B1 (fr) 1989-09-06
NO164076C (no) 1990-08-29
NO864329L (no) 1986-10-30
EP0214960A1 (fr) 1987-03-25

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