EP3495745A1 - Régulateur de pression différentielle auto-régulant pour un système d eau potable et système d'eau potable doté d'un tel régulateur de pression différentiel auto-régulant - Google Patents

Régulateur de pression différentielle auto-régulant pour un système d eau potable et système d'eau potable doté d'un tel régulateur de pression différentiel auto-régulant Download PDF

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Publication number
EP3495745A1
EP3495745A1 EP18209184.3A EP18209184A EP3495745A1 EP 3495745 A1 EP3495745 A1 EP 3495745A1 EP 18209184 A EP18209184 A EP 18209184A EP 3495745 A1 EP3495745 A1 EP 3495745A1
Authority
EP
European Patent Office
Prior art keywords
differential pressure
self
pressure regulator
regulating
drinking water
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.)
Granted
Application number
EP18209184.3A
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German (de)
English (en)
Other versions
EP3495745B1 (fr
EP3495745B8 (fr
Inventor
Robin Diekman
Thomas Spöler
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.)
Gebr Kemper GmbH and Co KG
Original Assignee
Gebr Kemper GmbH and Co KG
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Publication date
Application filed by Gebr Kemper GmbH and Co KG filed Critical Gebr Kemper GmbH and Co KG
Publication of EP3495745A1 publication Critical patent/EP3495745A1/fr
Publication of EP3495745B1 publication Critical patent/EP3495745B1/fr
Application granted granted Critical
Publication of EP3495745B8 publication Critical patent/EP3495745B8/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0264—Hydraulic balancing valves

Definitions

  • the present invention relates to a self-regulating differential pressure regulator for a drinking water system and a drinking water system with such a self-regulating differential pressure regulator.
  • Drinking water systems are known in the art and can be used in single-family homes or even large buildings with several apartments, in administrative buildings, industrial buildings, hospitals, etc. be installed. It has been shown that a stagnation of the water in the system is detrimental to drinking water quality. Therefore, the known drinking water systems often have a circulation pump and at least one circulation line in which the drinking water circulates. The hydraulic balancing of such drinking water systems is often difficult. Large circulation networks require high volume flows and a high differential pressure of the pump to overcome the pipe resistances. The most common problem in these networks is that control valves in near-pump lines can not break down the differential pressure without a significant increase in volume flow. The valve can be only up to a minimum value V K closed.
  • An object of the present invention is therefore to improve the hydraulic balancing in a drinking water system.
  • the drinking water system usually has a connection to a water supply, in particular to the public water supply network, and at least one water pipe to supply at least one consumer.
  • the drinking water system also has a water heater and / or a heat exchanger that heats cold water from the water supply, at least one hot water pipe, which leads the heated water to at least one consumer and at least one cold water pipe, the cold water from the water supply leads to at least one consumer.
  • Most of the hot water pipe is assigned a circulation line that returns unused hot water to the heater or the heat exchanger.
  • the cold water line may be associated with a circulation line.
  • Cold and hot water pipes are usually laid in parallel and supply consumers such as sinks, showers or bathtubs with hot and cold drinking water.
  • Differential pressure regulators are so far only in connection with heating systems, for example from the DE 10 2011 107 273 A1 or the DE 38 29 783 A1 known.
  • each part of the fluid flow is diverted in front of and behind the valve seat of the differential pressure regulator to a movable element.
  • the diverted fluid streams act on the movable element from different sides, so that the deflection of the movable element indicates or corresponds to the differential pressure.
  • Such differential pressure regulator are unsuitable for use in a drinking water system, since the redirecting routes mean dead spaces, which favor a nucleation and are not tolerable in drinking water systems for hygienic reasons.
  • the present invention provides a self-regulating differential pressure regulator for a drinking water system according to claim 7.
  • the self-regulating differential pressure regulator is self-regulating, i. reacts independently to changing pressures in the drinking water system, which are caused for example by a different load load, and regulates so that the differential pressure and thus the flow rate remains substantially constant.
  • the self-regulating differential pressure regulator is provided in a circulation line. Since usually only small volume flows are conveyed in circulation lines, a large control range of the self-regulating differential pressure regulator can be achieved.
  • differential pressure the difference of the pressure before and after or after the self-regulating differential pressure regulator is usually referred to.
  • the drinking water system comprises at least two supply units, wherein at least one of the supply units is associated with the self-regulating differential pressure regulator.
  • a supply unit according to the present invention comprises at least one consumer and starts from a common main line.
  • the main line is usually with the water supply and / or a water heater or a heat exchanger connected.
  • the nominal diameter of the main line is usually between DN10 - DN200, preferably between DN15 - DN100, and more preferably between DN20 - DN100.
  • the supply unit may extend over several floors of a building, so it is not limited to a single apartment or a single room with at least one wet room with at least one consumer.
  • Each supply unit may be associated with a differential pressure regulator.
  • the supply units each have a supply line and a supply line associated with the circulation line.
  • the nominal diameter of the circulation pipe is usually between DN10 - DN50, preferably between DN10 - DN32.
  • the supply line can conduct warm, cold or mixed tempered water.
  • the self-regulating differential pressure regulator is preferably arranged at the end of the circulation line and regulates the return from the circulation line in a circulation manifold.
  • the nominal size of the circulation manifold is usually between DN 10-DN200, preferably between DN12 - DN65.
  • the supply line is usually connected to the main line and communicates directly and / or via a supply line or supply lines with at least one consumer.
  • the nominal diameter of such supply lines is usually between DN10 - DN50, preferably between DN 10 - DN 32.
  • the circulation line communicates with the supply line on the one hand and on the other hand is connected to a circulation manifold.
  • the circulation conduit from the consumer (s) directs unused water (cold or hot) into the circulation manifold in which the water collects from the circulation conduits.
  • the circulation manifold usually communicates with a circulation pump to which the collected water is returned and which pumps the returned water back into the main line.
  • the recirculated water can pass through a water heater or a heat exchanger before entering or after leaving the pump.
  • the self-regulating differential pressure regulator By arranging the self-regulating differential pressure regulator at the end of the circulation line, the latter can best detect the pressure changes or pressure fluctuations within a supply unit, and thus respond optimally to them.
  • the adjustment of the differential pressure between supply units and the hydraulic balancing of the drinking water system as a whole can be improved.
  • the need for pre-throttling by one of the main line or supply line assigned deleted and the self-regulating differential pressure regulator fluidly upstream additional valve.
  • a circulation line has a diameter reduced by at least one nominal diameter compared with the supply line.
  • the supply units are arranged side by side in the horizontal direction. At least one of the supply units penetrates several floors, each with at least one consumer in a building.
  • the self-regulating differential pressure regulator is provided at one end of a multi-storey circulation line. Usually, the self-regulating differential pressure regulator is provided at the lower end of the circulation line in the gravitational direction. In particular, the self-regulating differential pressure regulator is arranged in the circulation line. Also conceivable is an arrangement according to which the water heater is provided in a different than the lowest floor. In this case, the differential pressure regulator can also be arranged at the upper end of the circulation line in the direction of gravity and / or at the level of the water cooler.
  • the drinking water system according to this preferred embodiment is particularly suitable for larger objects with preferably substantially symmetrical floors.
  • the supply line runs in accordance with this preferred development in the vertical direction.
  • the supply line preferably supplies a plurality of residential units arranged one above the other.
  • the circulation line according to this preferred embodiment preferably has a diameter which is in a range between DN 12 to DN 32.
  • the circulation line here has substantially the same vertical extent as the supply line.
  • the supply units are arranged one above the other in a building in the vertical direction.
  • the self-regulating differential pressure regulator is provided at one end of a circulation line extending in a single floor of the building.
  • the main line can extend over several floors both in the horizontal direction and in the vertical direction. The same usually applies to the circulation manifold.
  • the supply line usually extends only over a single floor of the building.
  • each of a plurality of supply units is assigned a self-regulating differential pressure regulator. This ensures improved hydraulic balancing of the drinking water system.
  • a drinking water system according to the present invention may also comprise supply units which are arranged horizontally next to one another and supply units which are arranged vertically one above the other.
  • the present invention provides a self-regulating differential pressure regulator for a drinking water system.
  • the self-regulating differential pressure controller is free of dead space.
  • dead space in sanitary engineering is usually referred to an area in which water stagnates, i. is not sufficiently flowed through by the flow of water. In a dead space, therefore, the water exchange is insufficient and the water stops. This promotes nucleation.
  • the self-regulating differential pressure regulator according to the present invention provides a remedy for this and is therefore particularly suitable for use in a drinking water system.
  • the present differential pressure regulator on a movable element by water pressure which is arranged in the fluid flow and is coupled to an adjusting device for adjusting a valve body.
  • the movable element is a membrane.
  • a movable element can also be a translationally and / or rotationally movable, in particular displaceable, rigid body, for example a piston element.
  • the movable element is made of a material suitable for use in drinking water, in particular an elastomer, which meets in particular the KTW guideline and / or DVGW W270.
  • Suitable material for a membrane are, for example, NBR, EPDM, FKM, SBR, NR or CR.
  • the material thickness of such a membrane is usually between 0.1 and 6 mm, preferably between 0.5 and 3 mm.
  • the movable element is arranged in the fluid flow, that is usually in a range which is exposed to a constant water exchange in the regular operation of the drinking water system. As a rule, both sides of the membrane are flowed by water of the fluid flow, which is exposed to a constant exchange of water in the regular operation of the drinking water system.
  • the adjusting device may include a spindle and / or a plunger, which is connected to the valve body and triggers an axial feed of the valve body in the direction of a valve seat upon deflection of the membrane in one direction.
  • a plate-like component or a shell may be provided, which is connected to the adjusting device.
  • a plate-like component or a shell is provided on both sides of the membrane, of which at least one is connected to the adjusting device.
  • the self-regulating differential pressure regulator has two sections separated from one another by the movable element in the fluid flow of the drinking water.
  • the movable element represents a water-impermeable separation.
  • the sections just described are not completely physically separated from each other, but are fluidically, in particular dead space, with each other.
  • the movable element can be acted upon by both sections with water pressure.
  • the movable element is provided in a fluid flow limiting wall of the self-regulating differential pressure regulator.
  • the movable element is integrated into the fluid flow-limiting wall such that the movable element forms a part of this wall.
  • one side of the movable element faces one of the two separate sections. In this case, one side of the movable element upstream in the direction of the fluid flow of the other side.
  • a diaphragm or a regulating valve body is arranged in the fluid flow between the two sides of the movable element.
  • the orifice defines a fixed resistance in the fluid flow of the drinking water, so that in front of and behind the orifice a different water pressure is created.
  • the deflection of the movable element is therefore a measure of the pressure drop across the diaphragm.
  • a regulating valve body is provided instead of the diaphragm.
  • the regulating valve body allows in conjunction with a regulating valve seat a, for example, manually or mechanically controlled, adjusting the resistance. The adjustment is made via the relative position of the regulating valve body with respect to the regulating valve seat.
  • the self-regulating differential pressure regulator has a device for presetting a desired value of the differential pressure.
  • the coupling strength of the membrane can be adjusted with the adjustment or adjusted to a specific value.
  • the device includes a spring, so that a deflection of the movable element takes place against the spring force of the spring element. For example, by variation of the spring strength so the target value of the differential pressure can be varied.
  • the self-regulating differential pressure regulator has a thermostatic element controlled by the water temperature.
  • the thermostatic element is associated with the regulating valve body such that a temperature change of the drinking water results in displacement of the regulating valve body.
  • a thermostatic element contains a so-called expansion element whose spatial extent varies depending on the temperature within a certain temperature range.
  • the volume flow can be regulated depending on the temperature by the self-regulating differential pressure regulator.
  • the thermostatic element can also be assigned to the device for presetting a desired value of the differential pressure.
  • the thermostatic element usually interacts with the spring, so that the spring force, against which the deflection of the membrane takes place, varies depending on the temperature.
  • the spring itself may form the thermostatic element or be formed from an expansion element.
  • the desired value of the differential pressure can be regulated or adjusted depending on the temperature.
  • the self-regulating differential pressure regulator has two thermostatic elements, wherein the one thermostatic element of the adjusting device for adjusting the valve body and the other thermostatic element of the device for presetting the desired value of the differential pressure is assigned.
  • the two thermostatic elements have a different temperature dependence.
  • the control range of the self-regulating differential pressure regulator can be increased overall.
  • the movable member is disposed in the differential pressure regulator such that the flow influences on both sides of the diaphragm are substantially equal to equalize. As a rule, this is ensured by straight paths before and after the movable element.
  • the length of these straight paths is 10 times their inner diameter, and more preferably 25 times their inner diameter.
  • the control range of the differential pressure regulator between 5 l / h to 300 l / h at a differential pressure between 10 hPa to 1500 hPa.
  • the differential pressure regulator on a bypass for bridging the valve seat cooperating with the valve body.
  • the bypass is formed as an opening in the wall upstream of the valve seat.
  • the thermostatic element associated with the diaphragm is associated with a further valve body, wherein the further valve body closes the opening in the normal operating state. If a high temperature is applied to the thermostatic element, the further valve body is pushed through the opening.
  • the differential pressure controller is usually sufficiently flushed ( ⁇ 70 ° C). Through a minimally open valve body of the diaphragm, a small amount of the fluid flows through the region of the differential pressure regulator. So disinfecting temperatures are reached here too.
  • FIG. 1 shows a drinking water system with a port 2 to the public water supply network, a main line 4 for hot water, a main line 6 for cold water and one of these main lines 4, 6 outgoing supply unit 8, which passes through four floors A, B, C, D.
  • the main line 4 for hot water is connected to a water heater 12, which is supplied with cold drinking water from the main line 6 for cold water.
  • the supply unit 8 has a supply line 14 for hot water and a supply line 16 for cold water.
  • the supply lines 14, 16 each depart from the respective main line and extend over the four floors.
  • the main lines 4, 6 are, however, in the horizontal direction (right in the FIG. 1 ) continued to supply more by four four superimposed wet cells 17 supply units 8 with cold or hot water.
  • the hot water supply line 14 is connected in each case to a hot water supply line 18A, 18B, 18C, 18D, which conducts the warm water to the individual consumers 20.
  • the cold water supply line 16 is connected in each case to a floor with a cold water supply line 22A, 22B, 22C, 22D, which leads cold water to the individual consumers 20.
  • the consumers 20 in the present case, using the example of the upper floor, a sink 20A1, a toilet 20A2, a shower 20A3, and a sink 20A4. In this case, the toilet 20A2 is connected only to the supply line 22A for cold water.
  • the hot water supply line 14 is associated with a circulation line 24.
  • the circulation line 24 is connected at its one end in the top floor A with the hot water supply line 14 and connected at its other, lower in the direction of gravity end with a circulation manifold 26.
  • Warm water is returned from the hot water supply pipe 14 via the circulation pipe 24 and the circulation manifold 26 connected to the water heater 12.
  • the circulation is maintained by a circulation pump 28 in the circulation manifold 26.
  • the circulation pump 28 is fluidly the Water heater 12 upstream.
  • a self-regulating differential pressure regulator 30 is arranged at the end of the circulation line 24, which opens into the circulation manifold 26 . This regulates the return of the hot water from the supply unit 8 in the circulation manifold 26.
  • Shut-off valves 32 are in the supply lines 18, 22 and shut-off valves 34 are arranged in the supply lines 14, 16. With these can be shut off, for example, during maintenance, the strand in question.
  • FIG. 2 are components that are already in FIG. 1 have been described with the same reference numerals.
  • the main pipes 4, 6 and the circulation manifold 26 in the potable water system extend after FIG. 2 also in the vertical direction over the four floors, whereas the individual each formed by a wet cell supply units 8A, 8B, 8C, 8D extend only over a single floor.
  • the supply lines 14A, 14B, 14C, 14D for hot water and 16A, 16B, 16C, 16D for cold water go off.
  • the supply lines 14, 16 each extend over a single floor and supply the consumers 20 of a floor directly with hot or cold water.
  • the hot water supply lines 14A, 14B, 14C, 14D are each associated with a circulation line 24A, 24B, 24C, 24D.
  • the hot water supply lines 14A, 14B, 14C, 14D each have sections of different nominal sizes.
  • the portion up to the first flow-supplied consumer 20A1 has a larger nominal diameter than the portion between the first-served consumer 20A1 and the consumer 20A3.
  • the nominal diameter of the section between the consumer 20A3 and the consumer 20A4 again has a smaller nominal diameter than the section between the consumer 20A1 and the consumer 20A3.
  • the circulation line 24A however, has an even smaller nominal size.
  • the FIG. 3 shows a self-regulating differential pressure regulator 30 in a schematic representation.
  • the arrow P in this illustration represents the flow direction of the water Diaphragm 40 is arranged in a wall 42 of the self-regulating differential pressure regulator 30. It is supplied with water from both sides and can be deflected in the direction of both sides. With its walls 42, 44 and the membrane 40, the self-regulating differential pressure regulator 30 defines a substantially S-shaped path for the water flow.
  • the arrangement of the membrane 40 in the S-shaped flow path shown enables the membrane 40 to be exposed to water and its pressure on both sides. It is in the cross section of FIG. 3 upwardly facing top of the membrane 40 upstream of the downward facing bottom in the flow direction.
  • a regulating valve body 46 In the fluid flow between the top and the bottom of the membrane 40, a regulating valve body 46 is arranged, which cooperates with a regulating valve seat 48. Water that passes through the underside of the membrane 40 must first pass through the upper side of the membrane 40 and then flow through the regulating valve seat 48.
  • the membrane 40 is impermeable to water and made of a suitable material for drinking water systems.
  • the membrane 40 is in each case subjected to a different water pressure on its top and bottom sides. Since the membrane 40 is movable by water pressure, the deflection of the diaphragm 40 is a measure of the pressure drop across the regulating valve body 46 and the regulating valve seat 48.
  • the membrane 40 as a water-impermeable element divides the differential pressure regulator 30 into two sections 33 and 35, wherein the in FIG. 3 above the diaphragm 40, the portion marked 33 is shown in FIG FIG. 3 below the membrane 40 shown in the section marked 35.
  • the diaphragm 40 is coupled to an adjustment device 52, which is connected to a valve body 54, which cooperates with a valve seat 56.
  • the adjusting device 52 is in this case a plunger which is connected to the membrane 40.
  • the valve body 54 and the valve seat 56 are arranged in the S-shaped flow path below the diaphragm 40, in particular without lateral offset, wherein a part of the wall 44 between the diaphragm 40 and the valve body 54 and the valve seat 56 is arranged.
  • the wall 44 is penetrated by the plunger 52.
  • An O-ring 58 seals the plunger 52 against the wall 44 from.
  • a spring 60 is a device for presetting a desired value provided the differential pressure and supported against the wall 44.
  • the diaphragm 40 Since the water pressure in the region 33 is greater than in the region 35, the diaphragm 40 is deflected against the spring force of the spring 60.
  • the valve body 54 and the valve seat 56 are downstream of the diaphragm 40 in the present case.
  • the individual components within the self-regulating differential pressure regulator can be arranged so that the valve seat 56 and the valve body 54 of the diaphragm 40 are upstream in terms of flow.
  • FIG. 4 shows a self-regulating differential pressure controller according to a further preferred embodiment. Same components compared to FIG. 3 are marked with the same reference numerals.
  • the design after FIG. 4 is different from the after FIG. 3 in that the valve body 46, which interacts with the expansion element 50, is extended by a further valve body 64.
  • the further valve body 64 closes in the in FIG. 4 shown situation, a bypass 62, which is formed as an opening in the valve seat 56 fluidly upstream wall.
  • FIG. 5 shows the self-regulating differential pressure controller FIG. 4
  • the expansion element 50 expands in such a way that the further valve body 64 - as in FIG. 5 shown - is pushed through the opening and releases the bypass.
  • the further valve body 64 In the normal operating state ( ⁇ 70 ° C), the further valve body 64 completely closes the bypass 62, as in FIG FIG. 4 shown.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Domestic Plumbing Installations (AREA)
  • Devices For Dispensing Beverages (AREA)
EP18209184.3A 2017-12-07 2018-11-29 Régulateur de pression différentielle auto-régulant pour un système d' eau potable et système d'eau potable doté d'un tel régulateur de pression différentiel auto-régulant Active EP3495745B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202017006304.2U DE202017006304U1 (de) 2017-12-07 2017-12-07 Selbstregulierender Differenzdruckregler für ein Trinkwassersystem und Trinkwassersystem mit einem solchen selbstregulierenden Differenzdruckregler

Publications (3)

Publication Number Publication Date
EP3495745A1 true EP3495745A1 (fr) 2019-06-12
EP3495745B1 EP3495745B1 (fr) 2024-03-06
EP3495745B8 EP3495745B8 (fr) 2024-05-01

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EP18209184.3A Active EP3495745B8 (fr) 2017-12-07 2018-11-29 Régulateur de pression différentielle auto-régulant pour un système d' eau potable et système d'eau potable doté d'un tel régulateur de pression différentiel auto-régulant

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EP (1) EP3495745B8 (fr)
DE (1) DE202017006304U1 (fr)
DK (1) DK3495745T3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3829783A1 (de) * 1987-12-18 1989-06-29 Oventrop Sohn Kg F W Strangregulierventil fuer heizungsanlagen
DE10084851B3 (de) * 1999-07-30 2005-09-29 Dalin Liu Regulierventil für konstanten Durchfluß
EP1845207A1 (fr) * 2006-04-13 2007-10-17 Gebr. Kemper GmbH + Co. KG Metallwerke Système d'eau potable et usée tout comme son procédé de fonctionnement
DE102011010840A1 (de) * 2011-02-10 2012-08-16 Oventrop Gmbh & Co. Kg Trink- oder Brauchwassersystem

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6935363B2 (en) * 2002-11-20 2005-08-30 Hydrogenics Corporation Pressure control system for low pressure operation
DE102011107273A1 (de) 2011-07-15 2013-01-17 Robert Bosch Gmbh Regelventileinrichtung mit Differenzdruckregler
DE202015006366U1 (de) * 2015-09-07 2016-12-08 Gebr. Kemper Gmbh + Co. Kg Metallwerke Trink- und Brauchwasserversorgungseinrichtung eines Gebäudes und Regulierventil hierfür

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3829783A1 (de) * 1987-12-18 1989-06-29 Oventrop Sohn Kg F W Strangregulierventil fuer heizungsanlagen
DE10084851B3 (de) * 1999-07-30 2005-09-29 Dalin Liu Regulierventil für konstanten Durchfluß
EP1845207A1 (fr) * 2006-04-13 2007-10-17 Gebr. Kemper GmbH + Co. KG Metallwerke Système d'eau potable et usée tout comme son procédé de fonctionnement
DE102011010840A1 (de) * 2011-02-10 2012-08-16 Oventrop Gmbh & Co. Kg Trink- oder Brauchwassersystem

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EP3495745B1 (fr) 2024-03-06
EP3495745B8 (fr) 2024-05-01
DK3495745T3 (da) 2024-04-22
DE202017006304U1 (de) 2019-03-08

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