EP0429450B1 - Chauffe-eau instantane chauffe au gaz - Google Patents

Chauffe-eau instantane chauffe au gaz Download PDF

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Publication number
EP0429450B1
EP0429450B1 EP89903459A EP89903459A EP0429450B1 EP 0429450 B1 EP0429450 B1 EP 0429450B1 EP 89903459 A EP89903459 A EP 89903459A EP 89903459 A EP89903459 A EP 89903459A EP 0429450 B1 EP0429450 B1 EP 0429450B1
Authority
EP
European Patent Office
Prior art keywords
valve
water
flow switch
control valve
venturi
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.)
Expired - Lifetime
Application number
EP89903459A
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German (de)
English (en)
Other versions
EP0429450A1 (fr
Inventor
Josef Schmid
Christian Welte
Hans Hoeness
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0429450A1 publication Critical patent/EP0429450A1/fr
Application granted granted Critical
Publication of EP0429450B1 publication Critical patent/EP0429450B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/18—Groups of two or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/20—Controlling one or more bypass conduits

Definitions

  • the invention is based on a gas-fired once-through water heater according to the two independent claims.
  • the actuator of the flow switch acts on a control valve in a bypass channel to the venturi, which is arranged in addition to the bypass channel containing the manual control valve.
  • the control valve ensures that the maximum temperature increase matched to a specified nominal output and a specified nominal water quantity of the device is not exceeded even if the nozzle valve is only opened to such an extent that the water throughput remains below the nominal water quantity.
  • the control valve only fulfills this function of keeping the temperature constant when the manual control valve in the second bypass line is closed and the device delivers hot water with the greatest possible temperature increase.
  • the manual control valve is opened more or less to preselect a lower outlet temperature of the water, the control valve is then no longer able to maintain the preselected lower outlet temperature if the water flow through the device is also throttled by only partially opening the nozzle.
  • water heaters of the generic type are known (DE-B-1 171 138), in which the bypass channel leading to the venturi via the manual control valve is additionally monitored by a control valve influenced by the flow switch, which only releases the bypass channel when the actuator of the flow switch is one of the full energy supply has covered the corresponding stroke.
  • This arrangement is intended to ensure that the setting of the manual control valve has no influence on the minimum water flow necessary for the flow switch to respond.
  • the arrangement according to the invention with the features of the independent claims has the advantage that the water outlet temperature not only maintains the temperature value preselected or set via the manual control valve at least approximately when tapping hot water, but also when tapping water of lower temperature if the water throughput exceeds Nozzle is limited to a value that lies between the minimum amount of water that triggers the flow switch and the maximum amount of water corresponding to the respective temperature selection.
  • the control element provided for constant hot water temperature can be a control pin protruding into the narrowest cross section of the Venturi.
  • the venturi is bridged by two bypass channels, one of which via the manual control valve and the other control valve for hot water temperature constancy influenced by the flow switch, whereas the other bypass channel contains a control valve for hot water temperature constancy influenced by the flow switch and the movable valve members of the control valves are firmly connected to the piston member.
  • the invention provides that the movable valve member of the control valve for constant hot water temperature has a throttle pin projecting axially into the valve opening of the control valve, which tapers towards its free end and carries an enlarged throttle collar there .
  • control valve is matched to the gas valve in such a way that, after a linear part of the stroke characteristic of the flow switch, the gas supply no longer increases or does not increase above a predetermined maximum value.
  • valve opening of at least one control valve is formed on a socket inserted into the bypass duct, the position of which relative to the movable valve member can be set within predetermined limits.
  • FIG. 1 shows a schematic overall representation of a gas-heated device for preparing hot or hot process water with a so-called water fitting in section
  • FIG. 2 shows a partial section through the water fitting according to FIG. 1 on an enlarged scale compared to FIG. 1
  • FIG. 3 shows a variant of a functional part of the water fitting
  • FIG 4 shows a functional diagram of the device according to FIGS. 1-3.
  • the device has a water flow line 10, which leads from a water inlet 12 via a water fitting provided as a whole with the reference number 14 and a heat exchanger 16 to a water outlet 18 or a nozzle 20.
  • a rust-shaped gas burner 22 Arranged beneath the heat exchanger 16 in a combustion shaft (not shown) is a rust-shaped gas burner 22 which is fed from a gas line 24 which is provided with a gas valve 26.
  • This has a closing member 28, which is pressed by a closing spring 30 against a valve seat at the valve opening and is provided with a conically tapering control shoulder 32 projecting into it.
  • the control approach 32 is designed so that there is a linear dependence of the gas throughput on the stroke of the closing member 28.
  • the water fitting 14 contains a flow switch 34 serving as a low water protection, which has a high pressure chamber 36 and a low pressure chamber 38, which are separated from each other by a piston member 40.
  • a flow switch 34 serving as a low water protection, which has a high pressure chamber 36 and a low pressure chamber 38, which are separated from each other by a piston member 40.
  • This consists of a membrane 42 ( Figure 2) and a rigid support plate 44 to which the membrane 42 is held by means of molded pins 46.
  • the piston member 40 is also fixedly connected to a valve lifter 48, which seals is led out of the low pressure chamber 38 and together with the piston member 40 forms a hydraulic actuator for the gas valve 26.
  • the water inlet 12 is connected to a chamber 52 in the water fitting 34 which receives a water quantity regulator or limiter 50 and from which a control passage 54 leads into the high pressure chamber 36.
  • the water quantity controller 50 which is shown in the control position in FIG. 2, has a control piston 56, which is pressed upwards by a control spring 58 against the piston member 40.
  • the control piston 56 has a control cone 60, which cooperates with a control edge 62 at the control passage 54 to control the flow of water into the high-pressure chamber 36.
  • a sleeve-shaped extension 63 which is slidably mounted in a closure part 64 screwed into the valve housing and in its central bore 66 accommodates the control spring 58, which is supported at the bottom on the closure part 64.
  • the bore 66 is connected via channels 67, 68 in the control piston 56 to the part of the chamber 52 above the control cone 60.
  • a channel 70 leads from the high-pressure chamber 36 to an outlet 72 of the water fitting, in which a venturi 74 is installed.
  • the narrowest point of the Venturi 74 is connected to the low-pressure chamber 38 via a narrow bore 76.
  • From the high-pressure chamber 36 two bypass channels 78 and 80 branching off the venturi 74 also branch off, both of which open into the channel 70 downstream of the venturi 74.
  • Both bypass channels 78, 80 are each provided with a control valve 82 and 84, the structure and function of which is described in more detail below.
  • a manual control valve 86 is also installed, which has the function of a temperature selector for the tap water in a known manner.
  • the control valve 82 has a throttle pin 90 projecting coaxially into the mouth region 88 of the bypass channel 78, which is firmly connected to the carrier plate 44 of the piston member 40.
  • the throttle pin 90 has a conically tapering central section 92, the diameter-larger starting area of which, when the piston member 40 is at rest, projects into a valve opening 94 of the control valve 82.
  • the throttle pin 90 is provided with a throttle collar 96 which is enlarged in diameter and which is located in the valve end 94 in the stroke end position of the piston member 40 in the valve opening 94 shown in the right in FIG.
  • the valve opening 94 is formed on a bushing 98 which is slidably mounted in the mouth region 88 of the bypass channel 78 and whose axial position can be set within predetermined limits by an adjusting device 100.
  • the adjusting device 100 has an actuating pin 104 which is rotatably mounted in the valve housing and is provided with a screw head 102 and which carries an eccentric bolt 106 at the inner end which engages in a recess on the circumference of the bushing 98.
  • the screw head 102 is provided with a transverse slot 108 for the insertion of a tool for turning the setting pin 104, the bearing points of which are sealed by O-rings 110 and 112 and which is fixed in the set position by a clamping screw 113 pressing against the screw head 102.
  • the control valve 84 of the bypass channel 80 leading via the manual control valve 86 also has a conically tapering throttle pin 114 fastened to the piston member 40, which is arranged coaxially with a mouth region 116 of the bypass channel 80 and one Passage cross section controls according to the stroke position of the piston member 40.
  • the valve opening of the control valve 84 can be arranged analogously to the control valve 82 on an axially adjustable bushing in the mouth region 116 of the bypass channel 80.
  • the throttle pin according to FIG. 3 can also be formed by a shape 114a in the carrier plate 44a.
  • the water quantity regulator 50 can be removed by loosening the closure part 64 to the outside.
  • a thin-walled flanged collar 120 is provided on it, which is initially parallel to the control axis and, after the sleeve-shaped extension 63 of the control piston 56 has been inserted, is folded inwards.
  • a pressure relief valve 122 is also installed in the closure part 64, the closing force of which can be adjusted from the outside by turning a screw plug 124 supporting the closing spring.
  • the actuating stroke h of the flow switch 34 and the temperature increase Delta t are plotted against the passage quantity Q of the water related to the time unit.
  • the manual control valve 86 is closed (hot water preparation)
  • the flow switch 34 responds at a water flow of approximately 1.8 l / min, lifting the closing member 28 of the gas valve 26 from its seat.
  • the linear stroke h increases linearly according to the line a until the flow rate Q has approximately reached the desired value of about 7.5 l / min set by the water volume controller 50.
  • the opening stroke of the gas valve closing element 28 also increases linearly with the flow rate Q.
  • the control approach 32 on the closing member 28 ensures that the amount of gas supplied to the burner 22 increases linearly with the flow rate Q of the water and vice versa.
  • the temperature of the drawn-off water from the minimum quantity required to open the gas valve 26 of approximately 1.8 l / min to the regulating quantity of approximately 7.5 l / min is approximately the prescribed value of the temperature increase of experiences about 50 ° K, for example.
  • the temperature profile of the drawn-off hot water is represented by line b, according to which an outlet temperature of approx. 60 ° C results when the water inlet temperature is assumed to be 10 ° C.
  • the actual characteristic curve of the actuating stroke h will lie in a spreading range at a preset device, which is indicated in the functional diagram by the two limit characteristic curves a 1 and a 2. Accordingly, the actual course of the temperature increase becomes delta t lie above the flow rate Q in a range which is indicated by the two limit characteristics b1 and b2.
  • the characteristic curves can be brought into the center of the scattering ranges by corresponding axial adjustment of the bushing 98 of the control valve 82, as shown in the functional diagram, where the temperature curve b most approximated to a straight line results.
  • the throttle collar 96 on the throttle pin 90 enters the valve opening 94, after which the disproportionate effect of the Venturi 74 comes into its own and the piston member 40 of the flow switch 34 already has a minimal further effect Increasing the water throughput reaches the stroke position corresponding to the control position of the water quantity regulator 50.
  • the arrangement is such that the gas valve 26 is already fully open when the throttle collar 96 takes effect, so that the full output of the burner 22 is achieved with certainty.
  • the user wants to tap water with a lower outlet temperature than 60 ° C or a lower temperature increase than 50 ° K, he opens the bypass channel 80 accordingly by means of the manual control valve 86.
  • the conditions are shown in the functional diagram when the manual control valve 86 is fully open. It is initially assumed that the bypass channel 80, as in the prior art, is only monitored by the manual control valve 86 and the control valve 84 provided according to the invention is missing in the bypass channel 80. Then the flow switch 34 would only at a flow rate of about 6 l / min. respond and open the gas valve 26. Thereafter, the actuating stroke h would increase with a further increase in the flow rate Q according to the characteristic curve d and a course of the temperature increase Delta t would result according to the characteristic curve e.
  • the characteristic curve e makes it clear that when dispensing hot water, the outlet temperature of which depends to a considerable extent on the flow rate based on the time unit, if the manual control valve 86 is not assigned any adjustment stroke-dependent correction means.
  • the two control valves 82 and 84 are so matched to one another and to the gas valve 26 or its closing member 28 that practically from the minimum flow rate of approx. 3.7 l / min up to the maximum flow rate of approx. 11 limited by the water quantity controller 50 l / min the gas supply to the water throughput increases approximately proportionally and vice versa, so that, according to characteristic curve i, the temperature increase delta t is approximately constant.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

Le chauffe-eau décrit est conçu de telle manière que même lorsque l'eau tirée n'est pas chauffée à la température maximale (eau chaude), la température de sortie présélectionnée est indépendante du débit par unité de temps. A cet effet, une soupape de commande (84) soumise à l'action de l'actuateur (40, 48) du commutateur d'écoulement (34) est agencée dans le canal de dérivation (80) en série avec la soupape de commande manuelle (86) prévue pour sélectionner la température. Lorsque la soupape de distribution (20) est ouverte, la soupape de commande (84) obture d'abord et ensuite libère progressivement le canal de dérivation (80). Le domaine préféré d'application se situe dans les chauffe-eau instantanés chauffés au gaz pour la fourniture d'eau chaude et tiède à usage sanitaire.

Claims (7)

  1. Chauffe-eau instantané au gaz comportant un Venturi (74) dans le chemin (10) de l'eau, dont le col est relié à la chambre basse pression (38) d'un commutateur de débit (34) dont la chambre haute pression (36) reçoit la pression amont du Venturi (74) et dont la chambre basse pression (38) est séparée par un piston (40) qui constitue avec une tige (48), un organe de réglage hydraulique de la soupape de gaz (26) et agit à la fois sur un régulateur ou limiteur de débit d'eau (50) dans l'alimentation (12) de la chambre haute pression (36) et sur un organe de commande (56) qui influence le débit dans le Venturi (74) en fonction de la soupape de gaz (26) pour qu'après mise en oeuvre du commutateur de débit (34), l'alimentation en gaz augmente au moins sensiblement de manière linéaire avec le débit d'eau et inversement ,
       et en outre deux canaux de dérivation (78, 80) qui contournent le Venturi (74) , l'un des canaux (80) passant par un robinet de réglage manuel (86) que l'utilisateur peut régler dans des limites pour choisir la température de l'eau chaude et l'autre canal (78) comporte une première soupape de commande (82) influencée par le commutateur de débit (34) pour la constance de la température de l'eau chaude,
       caractérisé en ce que :
    - le canal de dérivation (80) qui passe par le robinet de réglage manuel (86) est surveillé par une seconde soupape de commande (84) en série avec le robinet de réglage manuel (86),
    - les deux soupapes de commande (82, 84) comportant des organes d'obturation (90, 114) qui influencent les sections de passage des canaux de dérivation respectifs (78, 80) et sont reliés solidairement au piston (40),
    - l'organe d'obturation (114) de la seconde soupape de commande (84) influence par l'organe de réglage (40, 48) du commutateur de débit (34), le débit dans le canal de dérivation (80) pour que même lorsque le robinet de réglage manuel (86) est totalement ou partiellement ouvert et qu'en fonction d'une température de puisage, réduite, l'alimentation en gaz augmente au moins de manière pratiquement linéaire avec le débit d'eau après la mise en oeuvre du commutateur de débit (34) et inversement, pour aboutir à une température d'eau chaude constante.
  2. Chauffe-eau instantané au gaz comprenant un Venturi (74) dans le chemin (10) de l'eau, dont le col est relié à la chambre basse pression (38) d'un commutateur de débit (34), dont la chambre haute pression (36) reçoit la pression amont du Venturi (74) et qui est séparée de la chambre basse pression (38) par un piston (40) constituant avec une tige (48), un organe de réglage hydraulique d'une soupape de gaz (26) et agit à la fois sur un régulateur de débit ou limiteur de débit (50) dans l'arrivée (12) de la chambre haute pression (36) tout en agissant également sur un organe de commande (56) qui influence le débit dans le Venturi (74) en fonction de la soupape de gaz (26) pour qu'après mise en oeuvre du commutateur d'écoulement (34), l'alimentation en gaz augmente au moins de manière pratiquement linéaire avec le débit d'eau et inversement,
    - en outre avec deux canaux de dérivation (78, 80) contournant le Venturi (74), l'un des canaux (80) passant par un robinet de réglage manuel (86) par lequel l'utilisateur peut régler dans des limites choisies, la température de l'eau chaude et l'autre canal (78) comporte une première soupape de commande (82) influencée par le commutateur de débit (34) pour maintenir constante la température de l'eau chaude,
       caractérisé en ce que :
    - le canal de dérivation (80) passant par le robinet de réglage manuel (86) est surveillé par une seconde soupape de commande (84) montée en série avec la soupape de réglage manuelle (86) et dont l'organe d'obturation (114), réglable est influencé par l'organe de réglage (40, 48) du commutateur de débit (34) pour commander la section de passage du canal de dérivation (80) et,
    - l'organe d'obturation (90) mobile de la première soupape de commande (82) pour maintenir constante la température de l'eau chaude est un bouchon d'étranglement (90) pénétrant axialement dans l'ouverture de soupape (94) de la soupape de commande (82), ce bouchon allant en diminuant vers son extrémité libre pour y porter une collerette d'étranglement (96) à diamètre augmenté,
    - si bien que même lorsque le robinet de réglage manuel (86) est totalement ou partiellement ouvert et qu'en fonction d'une température de puisage, réduite, l'alimentation en gaz après la mise en oeuvre du commutateur de débit (34) augmente au moins sensiblement de manière linéaire avec le débit d'eau et inversement, pour avoir une eau chaude de température constante.
  3. Chauffe-eau selon des revendications 1 ou 2, caractérisé en ce que la première soupape de commande (82) est accordée sur la soupape de gaz (26) pour qu'après une partie linéaire de la courbe caractéristique de la course de réglage (a ou f) du commutateur de débit (34), il s'établit une course excédentaire (c ou g) telle que l'alimentation en gaz n'augmente plus ou ne dépasse pas une valeur maximale prédéterminée.
  4. Chauffe-eau selon l'une des revendications précédentes, caractérisé en ce que l'ouverture de soupape (94) d'au moins une soupape de commande (82) est formée sur un manchon (98) logé dans le canal de dérivation (78) et dont la position se règle dans des limites prédéterminées par rapport à l'organe d'obturation (90) mobile.
  5. Chauffe-eau selon l'une des revendications précédentes, caractérisé en ce que les deux canaux de dérivation (78, 80) débouchent de la chambre haute pression (36) du commutateur de débit (34), de manière coaxiale à son organe de réglage (40, 48) et les organes d'obturation (90, 114), mobiles des deux soupapes de commande (82, 84) sont des bouchons d'étranglement pénétrant axialement dans les zones d'embouchure (88, 116) des canaux de dérivation.
  6. Chauffe-eau selon l'une des revendications précédentes, caractérisé en ce que le piston (40) du commutateur de débit (34) est formé d'une membrane (42) solidaire d'une plaque de support (44) à laquelle sont fixés les deux organes d'obturation (90, 114), mobiles des soupapes de commande (82, 84).
  7. Chauffe-eau selon la revendication 6, caractérisé en ce qu'au moins un organe d'obturation est réalisé sur la plaque de support (44a) par une déformation (114a).
EP89903459A 1988-03-30 1989-03-22 Chauffe-eau instantane chauffe au gaz Expired - Lifetime EP0429450B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3810836A DE3810836A1 (de) 1988-03-30 1988-03-30 Gasbeheizter durchlauf-wassererhitzer
DE3810836 1988-03-30
PCT/DE1989/000180 WO1989009367A1 (fr) 1988-03-30 1989-03-22 Chauffe-eau instantane chauffe au gaz

Publications (2)

Publication Number Publication Date
EP0429450A1 EP0429450A1 (fr) 1991-06-05
EP0429450B1 true EP0429450B1 (fr) 1995-06-21

Family

ID=6351091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89903459A Expired - Lifetime EP0429450B1 (fr) 1988-03-30 1989-03-22 Chauffe-eau instantane chauffe au gaz

Country Status (7)

Country Link
EP (1) EP0429450B1 (fr)
KR (1) KR900700826A (fr)
AU (1) AU3282589A (fr)
DE (2) DE3810836A1 (fr)
ES (1) ES2013131A6 (fr)
PT (1) PT90155B (fr)
WO (1) WO1989009367A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61228355A (ja) * 1985-04-03 1986-10-11 Green Cross Corp:The 凝集反応の自動検出方法及び装置
ES2065804B1 (es) * 1992-02-27 1997-04-16 Fagor S Coop Mejoras introducidas en calentadores instantaneos de agua a gas.
EP1852654A3 (fr) * 2006-05-03 2015-11-04 Vaillant GmbH Contrôleur de débit d'eau pour chauffe-eau à gaz

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1194753A (fr) * 1957-05-31 1959-11-12 Vaillant Joh Kg Chauffe-eau instantané avec régulateur de débit à membrane
FR76864E (fr) * 1959-09-29 1961-12-15 Vaillant Joh Kg Chauffe-eau instantané avec régulateur de débit à membrane
DE1171138B (de) * 1960-07-16 1964-05-27 Godesia Werk Badeapp Und Metal Wassermangelsicherung fuer Durchlauferhitzer
FR92079E (fr) * 1967-03-17 1968-09-20 Chaffoteaux Et Maury Perfectionnements aux chauffe-eau
DE1679694A1 (de) * 1967-10-20 1971-04-08 Junkers & Co Gasbeheizter Durchlauf-Wassererhitzer mit einer Wassermangelsicherung
BE794663A (fr) * 1972-06-26 1973-07-30 Leblanc Sa Perfectionnement a l'allumage des bruleurs d'appareils a gaz, tels que chauffe-eau, chauffe-bains, chaudieres de chauffage central, radiateurs a gaz et analogues
DE2330486A1 (de) * 1973-06-15 1975-01-16 Junkers & Co Gasbeheizter wassererhitzer, insbesondere durchlauf-wassererhitzer
FR2373004A1 (fr) * 1976-12-03 1978-06-30 Saunier Duval Dispositif de reglage du petit debit d'une electrovalve pour appareils du genre chaudiere a gaz
FR2541434B1 (fr) * 1983-02-23 1987-01-30 Vaillant Sarl Chauffe-eau instantane a gaz

Also Published As

Publication number Publication date
ES2013131A6 (es) 1990-04-16
DE58909312D1 (de) 1995-07-27
WO1989009367A1 (fr) 1989-10-05
DE3810836A1 (de) 1989-10-12
KR900700826A (ko) 1990-08-17
PT90155B (pt) 1994-05-31
AU3282589A (en) 1989-10-16
EP0429450A1 (fr) 1991-06-05
PT90155A (pt) 1989-11-10

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