EP0045351B1 - Non-return valve for rectangular gas ducts - Google Patents

Non-return valve for rectangular gas ducts Download PDF

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Publication number
EP0045351B1
EP0045351B1 EP81103301A EP81103301A EP0045351B1 EP 0045351 B1 EP0045351 B1 EP 0045351B1 EP 81103301 A EP81103301 A EP 81103301A EP 81103301 A EP81103301 A EP 81103301A EP 0045351 B1 EP0045351 B1 EP 0045351B1
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EP
European Patent Office
Prior art keywords
frame
flap
flaps
backpressure
backflow
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Expired
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EP81103301A
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German (de)
French (fr)
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EP0045351A2 (en
EP0045351A3 (en
Inventor
Hans-Joachim Naber
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Naber and Co KG
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Naber and Co KG
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Publication of EP0045351A3 publication Critical patent/EP0045351A3/en
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    • 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

Definitions

  • the invention relates to a backflow flap according to the preamble of claim 1.
  • Such backflow flaps were previously attached to the ventilation ducts as individual parts. They were often located on the outside of the ventilation ducts, i.e. generally attached to the outer wall of the building in the form of a plurality of flaps arranged one below the other. These flaps were exposed to weather and wind and caused wind noise. Depending on the wind, they were also opened a slot so that drafts penetrated and the intended effect of preventing a backflow against the ventilation flow was not achieved. Such backflow flaps were also not suitable for preventing insects from entering the building. On the other hand, it was not possible to install fine-meshed insect screens after the backflow flaps forming the outer end of the ventilation channels.
  • backflow flaps For many purposes, it has so far not been possible to attach backflow flaps. This applies in particular to various distribution ducts, for example Y distributors or trousers pieces, cross distributors etc. In terms of production, it has so far been practically impossible or only possible with great effort to provide backflow flaps in the individual supply air and exhaust air ducts. The result of this was that the air streams were mixed and often unwanted exhaust gases were directed to where they should not be directed. This fact has also led to strict building regulations regarding the introduction of exhaust gases from different sources into a common ventilation chimney.
  • flat duct systems which are mainly used as ventilation ducts in extractor hoods, clothes dryers and small ventilation systems as well as small ventilation systems.
  • Such flat channels are usually about 7 to 20 cm wide and only 3 to 15 cm high. The same applies to use in flat, rectangular, flexible hoses that are used for the same purposes.
  • a similar wall box is known from British patent specification 1 326 204, which likewise cannot be inserted into flat or square channels.
  • a backflow flap according to the preamble of claim 1 is known from German Offenlegungsschrift 2 901 877.
  • This backflow flap is specially designed as a closure device with reliable gas sealing for gas lines in nuclear reactors with radioactive gases.
  • a very narrow frame is provided, the surface of which has a slight inclination and the outer surfaces of which are sealed against the inner wall of the tube by means of special sealing materials.
  • a plate is arranged, which presses flat against sealing materials that are provided around the circumference of this plate.
  • this backflow flap does not appear to be very suitable for use in simple house systems and ventilation ducts, such as those found in household clothes dryers and extractor hoods.
  • such a flap should be relatively expensive because of the high sealing effort. This is especially true because the seal has to be specially adapted to the respective channels.
  • the invention is based on the object of designing a backflow flap according to the preamble of claim 1 in such a way that the disadvantages of the prior art are avoided and that it is simple to produce, insertable and easy to insert into different types of ventilation channels and at different depths as an insert .
  • Such a backflow flap can thus be inserted into any ventilation channel. If, for example, it is inserted into the outer opening of a ventilation duct attached to an outer wall of the building, the individual flaps are arranged in the interior of the frame so that they are protected from wind and weather. Rattling is avoided, as is weather impairment. It is easily possible to install an insect screen on the outer wall, even after the backflow flap.
  • the backflow flap according to the invention can be inserted into the ventilation channels as far as desired. If, for example, in the outermost position of the backflow flap, there is still a clattering of the flaps and thus the penetration of outside air into the interior of the building, this can easily be stopped by moving the backflow flap a little further towards the interior of the building.
  • the backflow flap according to the subject of the invention can be used particularly advantageously in various distribution channels, for example Y-shaped distribution channels.
  • distribution channels are usually made of sheet metal or plastic, without the possibility of attaching backflow flaps to the respective flow-side ends of the branch channels, so that undesired mixing of the individual air streams resulted.
  • the lower inside of the frame is inclined slightly downward downstream.
  • the purpose of this is to ensure that any liquids that come into contact with the backflow flap from the outside or condensate water that forms on them is drained outwards. It is thus possible to achieve further advantages with the subject matter of the invention, which could not be achieved by installing flaps arranged one above the other on the outer wall of the building.
  • the two flaps are arranged one above the other and conveniently articulated on the side walls of the frame.
  • the upper edge of the lower backflow flap serves as a stop for the free end of the upper backflow flap.
  • the arrangement of two backflow flaps one above the other has proven to be particularly expedient in the usual dimensions of backflow flaps, the width of such flaps being approximately 1 m to 1.5 m and the height approximately 50 cm to 1 m.
  • Metal sheet for example galvanized sheet metal, or plastic such as polypropylene is expediently used as the material for the backflow flap.
  • the backflow flap is generally designated 1. It has a rectangular frame 2. In this frame 2, two flaps 3 and 4 are arranged one above the other. These flaps are hinged to the side walls 6 and 7 of the frame 2. The upper edge of the lower flap 4 also serves as a stop 9 for the free end of the upper flap 3. For the free end of the lower flap 4, two stops 8 provided inside the frame 2 serve as a stop.
  • the direction of flow through the backflow flap is indicated in FIG. 2 by arrows.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Ventilation (AREA)

Description

Die Erfindung bezieht sich auf eine Rückstauklappe gemäss dem Oberbegriff des Anspruches 1.The invention relates to a backflow flap according to the preamble of claim 1.

Derartige Rückstauklappen wurden bisher an die Entlüftungskanäle als einzelne Teile angehängt. Häufig wurden sie an der Aussenseite der Entlüftungskanäle, d.h. im allgemeinen an der Aussenwand des Gebäudes, in Form von mehreren untereinander angeordneten Klappen angebracht. Diese Klappen waren Wetter und Wind ausgesetzt und verursachten Windgeräusche. Je nach Wind wurden sie auch einen Schlitz weit geöffnet, so dass Zugluft nach innen drang und die beabsichtigte Wirkung, einen Rückstau entgegen der Entlüftungsströmung zu verhindern, nicht erreicht wurde. Derartige Rückstauklappen waren auch nicht geeignet, Insekten am Eindringen ins Gebäudeinnere zu hindern. Andererseits war es nicht möglich, im Anschluss an die den Aussenabschluss der Entlüftungskanäle bildenden Rückstauklappen feinmaschige Insektengitter anzubringen.Such backflow flaps were previously attached to the ventilation ducts as individual parts. They were often located on the outside of the ventilation ducts, i.e. generally attached to the outer wall of the building in the form of a plurality of flaps arranged one below the other. These flaps were exposed to weather and wind and caused wind noise. Depending on the wind, they were also opened a slot so that drafts penetrated and the intended effect of preventing a backflow against the ventilation flow was not achieved. Such backflow flaps were also not suitable for preventing insects from entering the building. On the other hand, it was not possible to install fine-meshed insect screens after the backflow flaps forming the outer end of the ventilation channels.

Für viele Einsatzzwecke war es bisher überhaupt nicht möglich, Rückstauklappen anzubringen. Dies gilt insbesondere für diverse Verteilerkanäle, beispielsweise Y-Verteiler oder Hosenstücke, Kreuzverteiler etc. Herstellungsmässig war es bisher praktisch nicht möglich oder nur mit grösstem Aufwand möglich, in den einzelnen Zuluft- bzw. Abluftkanälen Rückstauklappen vorzusehen. Die Folge davon war, dass die Luftströme vermischt wurden und häufig unerwünschte Abgase dorthin gelenkt wurden, wo sie nicht hingeleitet werden sollten. Diese Tatsache hat auch zu strengen bauaufsichtlichen Vorschriften bezüglich der Einleitung von Abgasen aus verschiedenen Quellen in einen gemeinsamen Entlüftungskamin geführt.For many purposes, it has so far not been possible to attach backflow flaps. This applies in particular to various distribution ducts, for example Y distributors or trousers pieces, cross distributors etc. In terms of production, it has so far been practically impossible or only possible with great effort to provide backflow flaps in the individual supply air and exhaust air ducts. The result of this was that the air streams were mixed and often unwanted exhaust gases were directed to where they should not be directed. This fact has also led to strict building regulations regarding the introduction of exhaust gases from different sources into a common ventilation chimney.

Auch für sogenannte Flachkanalsysteme, die überwiegend als Entlüftungskanäle bei Dunstabzughauben, Wäschetrocknern und Kleinentlüftungsanlagen sowie Kleinbelüftungsanlagen eingesetzt werden, gibt es bis jetzt keine geeigneten Rückstauklappen. Derartige Flachkanäle sind in der Regel ca. 7 bis 20 cm breit und lediglich 3 bis 15 cm hoch. Ähnliches gilt für den Einsatz in flachen, rechteckigen, flexiblen Schläuchen, die für die gleichen Verwendungszwecke eingesetzt werden.There are also no suitable backflow flaps for so-called flat duct systems, which are mainly used as ventilation ducts in extractor hoods, clothes dryers and small ventilation systems as well as small ventilation systems. Such flat channels are usually about 7 to 20 cm wide and only 3 to 15 cm high. The same applies to use in flat, rectangular, flexible hoses that are used for the same purposes.

Aus der britischen Patentanmeldung 2 041 514 (veröffentlicht am 10.9.80) ist ein Mauerkasten bekannt, der innen liegende Jalousien aufweist und dessen Querschnittsform einem daran anzuschliessenden Flachkanal in allen Querschnittsebenen geometrisch ähnlich ist. Dieser Mauerkasten lässt sich jedoch nicht in Flachkanäle einschieben, sondern nur an Maueröffnungen anschliessen.From British patent application 2 041 514 (published on September 10, 1980) a wall box is known which has internal blinds and whose cross-sectional shape is geometrically similar to a flat channel to be connected to it in all cross-sectional planes. However, this wall box cannot be inserted into flat channels, but only connected to wall openings.

Aus der britischen Patentschrift 1 326 204 ist ein ähnlicher Mauerkasten bekannt, der ebenfalls nicht in flache beziehungsweise viereckige Kanäle einschiebbar ist.A similar wall box is known from British patent specification 1 326 204, which likewise cannot be inserted into flat or square channels.

Eine Rückstauklappe gemäss dem Oberbegriff des Anspruches 1 ist aus der Deutschen Offenlegungsschrift 2 901 877 bekannt. Diese Rückstauklappe ist speziell als Verschlussvorrichtung mit zuverlässiger Gasabdichtung bei Gasleitungen in Atomreaktoren mit radioaktiven Gasen ausgelegt. Zu diesem Zwecke ist ein sehr schmaler Rahmen vorgesehen, dessen Fläche eine leichte Neigung hat und dessen Aussenflächen durch spezielle Abdichtungsmaterialien dicht gegen die Innenwandung des Rohres abdichten. An dem strömungsabwertigen Ende dieses Rahmens ist eine Platte angeordnet, die flächig gegen Dichtungsmaterialien drückt, die um den Umfang dieser Platte vorgesehen sind.A backflow flap according to the preamble of claim 1 is known from German Offenlegungsschrift 2 901 877. This backflow flap is specially designed as a closure device with reliable gas sealing for gas lines in nuclear reactors with radioactive gases. For this purpose, a very narrow frame is provided, the surface of which has a slight inclination and the outer surfaces of which are sealed against the inner wall of the tube by means of special sealing materials. At the downstream end of this frame, a plate is arranged, which presses flat against sealing materials that are provided around the circumference of this plate.

Entsprechend dem speziellen Einsatzzweck ist nach der Installation dieser Rückstauklappe im allgemeinen keine leichte Verschiebbarkeit vorgesehen. Dem speziellen Einsatzzweck mit den hohen Anforderungen an eine sichere Abdichtung angepasst ist das wesentliche Augenmerk auf die Abdichtungsmaterialien gelegt..Dabei ist zu beachten, dass genügend Schwenkmöglichkeit für die Klappe besteht, da die Rückstauklappe selbst keinen derartigen Schwenkraum vorsieht. Da nur eine einzige Klappe vorgesehen ist, muss dieser Schwenkraum besonders gross sein. Die dadurch bedingte relativ grosse Platte benötigt verhältnismässig grosse Strömungskräfte, damit sie überhaupt geöffnet werden kann. Insgesamt erscheint diese Rückstauklappe für Einsatzzwecke bei einfachen Hausanlagen und Entlüftungskanälen, wie sie beispielsweise bei Haushalts-Wäschetrocknern und Abzugshauben vorkommen, wenig geeignet. Die dort auftretenden relativ geringen Strömungsgeschwindigkeiten dürften für die Öffnung dieser Klappe kaum ausreichen. Darüberhinaus dürfte eine derartige Klappe wegen des hohen Dichtungsaufwandes verhältnismässig teuer sein. Dies insbesondere, da die Dichtung speziell an die jeweiligen Kanäle angepasst werden muss.According to the special application, after the installation of this backflow flap, there is generally no easy movement. The special attention to the sealing materials has been adapted to the special application with the high requirements for a secure seal. It should be noted that there is enough pivoting possibility for the flap, since the backflow flap itself does not provide such a pivoting space. Since only a single flap is provided, this swivel space must be particularly large. The resulting relatively large plate requires relatively large flow forces so that it can be opened at all. Overall, this backflow flap does not appear to be very suitable for use in simple house systems and ventilation ducts, such as those found in household clothes dryers and extractor hoods. The relatively low flow velocities occurring there should hardly be sufficient to open this flap. In addition, such a flap should be relatively expensive because of the high sealing effort. This is especially true because the seal has to be specially adapted to the respective channels.

Der Erfindung liegt die Aufgabe zu Grunde, eine Rückstauklappe gemäss dem Oberbegriff des Anspruches 1 so auszubilden, dass die Nachteile des Standes der Technik vermieden werden, und dass sie als Einsetzteil einfach herstellbar, einfach montierbar und einfach in verschiedenartige Entlüftungskanäle und in unterschiedlichen Tiefen einschiebbar ist.The invention is based on the object of designing a backflow flap according to the preamble of claim 1 in such a way that the disadvantages of the prior art are avoided and that it is simple to produce, insertable and easy to insert into different types of ventilation channels and at different depths as an insert .

Die Aufgabe wird erfindungsgemäss durch die Merkmale des Kennzeichens des Anspruches 1 gelöst. Weitere Ausbildungen der Erfindung sind in den Unteransprüchen dargestellt.The object is achieved according to the invention by the features of the characterizing part of claim 1. Further developments of the invention are presented in the subclaims.

Gemäss dem Erfindungsgegenstand weist eine Rückstauklappe folgende Merkmale auf:

  • a) einen rechteckigen Rahmen, dessen Aussenflächen und Aussenbegrenzungen zum Einschieben in die Entlüftungskanäle im wesentlichen eben ausgebildet sind,
  • b) Zwei Klappen, die im Inneren des Rahmens in der Nähe des Eintritts der Entlüftungsströmung angelenkt sind, und deren Höhe etwas geringer als die Tiefe des Rahmens ist,
  • c) Anschläge für die unteren freien Enden der Klappen, die ein Durchschwingen entgegen der Entlüftungsströmung verhindern.
According to the subject matter of the invention, a backflow flap has the following features:
  • a) a rectangular frame, the outer surfaces and outer limits of which are essentially flat for insertion into the ventilation ducts,
  • b) two flaps articulated inside the frame near the inlet of the vent flow and the height of which is slightly less than the depth of the frame,
  • c) stops for the lower free ends of the flaps, which prevent swinging against the ventilation flow.

Eine derartige Rückstauklappe kann somit in jeden beliebigen Entlüftungskanal eingeschoben werden. Wird sie beispielsweise in die äussere Öffnung eines an einer Gebäudeaussenwand angebrachten Lüftungskanals eingeschoben, so sind die einzelnen Klappen wind- und wettergeschützt im Inneren des Rahmens angeordnet. Ein Klappern wird damit ebenso wie eine Witterungsbeeinträchtigung vermieden. Es ist ohne weiteres möglich, an der Aussenwand selbst im Anschluss an die Rückstauklappe ein Insektengitter anzubringen.Such a backflow flap can thus be inserted into any ventilation channel. If, for example, it is inserted into the outer opening of a ventilation duct attached to an outer wall of the building, the individual flaps are arranged in the interior of the frame so that they are protected from wind and weather. Rattling is avoided, as is weather impairment. It is easily possible to install an insect screen on the outer wall, even after the backflow flap.

Die Rückstauklappe gemäss der Erfindung lässt sich beliebig weit in die Entlüftungskanäle einschieben. Sollte beispielsweise in der äussersten Stellung der Rückstauklappe unter ungünstigen Windverhältnissen noch ein Klappern der Klappen und somit auch ein Eindringen von Aussenluft ins Gebäudeinnere erfolgen, so kann dies leicht dadurch abgestellt werden, dass man die Rückstauklappe noch ein bisschen weiter in Richtung auf das Gebäudeinnere verschiebt.The backflow flap according to the invention can be inserted into the ventilation channels as far as desired. If, for example, in the outermost position of the backflow flap, there is still a clattering of the flaps and thus the penetration of outside air into the interior of the building, this can easily be stopped by moving the backflow flap a little further towards the interior of the building.

Es ist auch möglich, die Rückstauklappe unmittelbar in eine Maueröffnung, die in diesem Fall als Entlüftungskanal dient, in die den Umständen entsprechende Stellung innerhalb des Mauerdurchbruches einzuschieben und zuzumauern. Die Vorteile bleiben auch in diesem Falle erhalten.It is also possible to push the backflow flap directly into a wall opening, which in this case serves as a ventilation duct, into the position within the wall opening corresponding to the circumstances and to wall it up. The advantages remain in this case.

Besonders vorteilhaft ist die Rückstauklappe nach dem Gegenstand der Erfindung bei diversen Verteilerkanälen, beispielsweise Y-förmigen Verteilerkanälen einsetzbar. Derartige Verteilerkanäle werden üblicherweise aus Blech oder aus Kunststoff hergestellt, ohne dass die Möglichkeit bestünde, an den jeweiligen strömungsseitigen Enden der Abzweigkanäle Rückstauklappen anzubringen, so dass sich unerwünschte Vermischungen der einzelnen Luftströme ergaben.The backflow flap according to the subject of the invention can be used particularly advantageously in various distribution channels, for example Y-shaped distribution channels. Such distribution channels are usually made of sheet metal or plastic, without the possibility of attaching backflow flaps to the respective flow-side ends of the branch channels, so that undesired mixing of the individual air streams resulted.

Dies kann durch den Gegenstand der Erfindung sehr leicht dadurch behoben werden, dass man einfach vom offenen Ende her je eine als Einsatzteil ausgebildete Rückstauklappe bis zum Ende dieser Abzweigung einschiebt, und zwar so, dass nur ein Durchlass in der gewünschten Richtung möglich ist.This can be very easily remedied by the subject matter of the invention by simply inserting a backflow flap, designed as an insert, from the open end to the end of this branch, in such a way that only passage in the desired direction is possible.

Nach einer Ausbildung der Erfindung ist die untere Innenseite des Rahmens strömungsabwärts leicht nach unten geneigt. Dies dient dazu, dass eventuell von aussen auf die Rückstauklappe auftreffende Flüssigkeiten oder daran entstehendes Kondenswasser nach aussen abgeleitet wird. Es ist somit möglich, mit dem Gegenstand der Erfindung weitere Vorteile zu erzielen, die durch den Anbau von übereinander angeordneten Klappen an der Gebäudeaussenwand nicht zu erzielen waren.According to an embodiment of the invention, the lower inside of the frame is inclined slightly downward downstream. The purpose of this is to ensure that any liquids that come into contact with the backflow flap from the outside or condensate water that forms on them is drained outwards. It is thus possible to achieve further advantages with the subject matter of the invention, which could not be achieved by installing flaps arranged one above the other on the outer wall of the building.

Die zwei Klappen sind übereinander angeordnet und zweckmässigerweise an den Seitenwänden des Rahmens angelenkt. Dabei dient die Oberkante der unteren Rückstauklappe als Anschlag für das freie Ende der oberen Rückstauklappe. Die Anordnung von zwei Rückstauklappen übereinander hat sich bei den üblichen Abmessungen von Rückstauklappen als besonders zweckmässig erwiesen, wobei die Breite derartiger Klappen etwa 1m bis 1,5 m, die Höhe etwa 50 cm bis 1 m beträgt. Dadurch, dass die einzelnen Klappen auch im voll ausgeschwenkten Zustand innerhalb des Rahmens bleiben sollen, ergibt sich aus der Länge der einzelnen Klappen die notwendige Tiefe des Rahmens.The two flaps are arranged one above the other and conveniently articulated on the side walls of the frame. The upper edge of the lower backflow flap serves as a stop for the free end of the upper backflow flap. The arrangement of two backflow flaps one above the other has proven to be particularly expedient in the usual dimensions of backflow flaps, the width of such flaps being approximately 1 m to 1.5 m and the height approximately 50 cm to 1 m. The fact that the individual flaps should remain within the frame even when fully pivoted out, the length of the individual flaps results in the necessary depth of the frame.

Für die Rückstauklappe wird zweckmässigerweise als Material Metallblech, beispielsweise verzinktes Blech, oder Kunststoff wie Polypropylen verwendet.Metal sheet, for example galvanized sheet metal, or plastic such as polypropylene is expediently used as the material for the backflow flap.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Es zeigt:

  • Fig. 1 eine Ansicht auf die Rückstauklappe von hinten,
  • Fig. 2 eine Rückstauklappe gemäss Fig. 1 im Schnitt,
  • Fig. 3 eine Rückstauklappe von oben im Schnitt.
An embodiment of the invention is shown in the drawing. It shows:
  • 1 is a view of the backflow flap from behind,
  • 2 shows a backflow flap according to FIG. 1 in section,
  • Fig. 3 shows a backflow valve from above in section.

Die Rückstauklappe ist allgemein mit 1 bezeichnet. Sie weist einen rechteckigen Rahmen 2 auf. In diesem Rahmen 2 sind zwei übereinander angeordnete Klappen 3 und 4 angeordnet. Diese Klappen sind an den Seitenwänden 6 und 7 des Rahmens 2 angelenkt. Die Oberkante der unteren Klappe 4 dient dabei gleichzeitig als Anschlag 9 für das freie Ende der oberen Klappe 3. Für das freie Ende der unteren Klappe 4 dienen zwei im Inneren des Rahmens 2 vorgesehene Anschläge 8 als Anschlag.The backflow flap is generally designated 1. It has a rectangular frame 2. In this frame 2, two flaps 3 and 4 are arranged one above the other. These flaps are hinged to the side walls 6 and 7 of the frame 2. The upper edge of the lower flap 4 also serves as a stop 9 for the free end of the upper flap 3. For the free end of the lower flap 4, two stops 8 provided inside the frame 2 serve as a stop.

Die Strömungsrichtung durch die Rückstauklappe ist in Fig. 2 durch Pfeile angedeutet.The direction of flow through the backflow flap is indicated in FIG. 2 by arrows.

Claims (4)

1. A backpressure stop valve for use in rectangular gas-conducting passages, comprising a frame (2) adapted to be inserted into a passage and having substantially flat outer surfaces, and comprising closure means secured to said frame (2) and pivotable in flap-fashion into sealing relationship against said frame (2), characterized in that
a) said closure means is formed of two superposed flaps (3, 4) having their pivot axes disposed in the vicinity of the inlet port for a stream of gas within said frame (2),
b) the height of each of said flaps (3, 4), which extends transversely to the pivot axis, is smaller than the depth of said frame (2), said frame (2) being of cuboid configuration and being disposed perpendicularly or, respectively, in parallel to the longitudinal extension of said passage, and
c) a lower abutment (8) is provided at the bottom (5) of said frame (2) for the lower edge of the lower flap (4) and an upper abutment (9) is provided for the lower edge of the upper flap (3), the upper edge or, respectively, pivotable arrangement of said lower flap (4) simultaneously forming said abutment (9) for said lower edge of said upper flap (3).
2. A backpressure stop valve according to claim 1, characterized in that said bottom (5) of said frame (2) has a slight downward inclination in downstream direction.
3. A backpressure stop valve according to claim 1 or 2, characterized in that said two flaps are hingedly mounted at the inner sides of the side walls (6, 7) of said frame (2).
4. A backpressure stop valve according to claim 1 or 2, characterized in that the material used is sheet metal or preferably a synthetic material such as polypropylene.
EP81103301A 1980-08-06 1981-05-02 Non-return valve for rectangular gas ducts Expired EP0045351B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8021092U 1980-08-06
DE19808021092U DE8021092U1 (en) 1980-08-06 1980-08-06 BACKFLOW VALVE FOR RECTANGULAR VENTILATION CHANNELS, IN PARTICULAR DISTRIBUTION CHANNELS OR FLAT CHANNELS

Publications (3)

Publication Number Publication Date
EP0045351A2 EP0045351A2 (en) 1982-02-10
EP0045351A3 EP0045351A3 (en) 1982-03-31
EP0045351B1 true EP0045351B1 (en) 1985-04-10

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EP81103301A Expired EP0045351B1 (en) 1980-08-06 1981-05-02 Non-return valve for rectangular gas ducts

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US5360372A (en) * 1989-05-02 1994-11-01 Gpac, Inc. Control system for doors of a negative air pressure enclosure

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DE2901877A1 (en) * 1979-01-18 1980-07-31 Meissner & Wurst Automatic stop valve for gas main - has elastic hinging non return flap against downstream side of inserted frame

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GB1326204A (en) * 1970-08-22 1973-08-08 Bloxvich Lock Stamping Reigisters for ducted warm air heating systems
DE2904320C2 (en) * 1979-02-05 1981-12-17 Kiparski, Heinz, 4390 Gladbeck Wall box for connection to the end of a flat ventilation duct of an extractor hood

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2901877A1 (en) * 1979-01-18 1980-07-31 Meissner & Wurst Automatic stop valve for gas main - has elastic hinging non return flap against downstream side of inserted frame

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EP0045351A2 (en) 1982-02-10
EP0045351A3 (en) 1982-03-31
DE8021092U1 (en) 1980-11-06
DE3169791D1 (en) 1985-05-15

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