EP0555837A1 - Backflow preventer - Google Patents

Backflow preventer Download PDF

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Publication number
EP0555837A1
EP0555837A1 EP93102087A EP93102087A EP0555837A1 EP 0555837 A1 EP0555837 A1 EP 0555837A1 EP 93102087 A EP93102087 A EP 93102087A EP 93102087 A EP93102087 A EP 93102087A EP 0555837 A1 EP0555837 A1 EP 0555837A1
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EP
European Patent Office
Prior art keywords
pressure
intermediate chamber
system separator
differential pressure
stabilizer
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
EP93102087A
Other languages
German (de)
French (fr)
Other versions
EP0555837B1 (en
Inventor
Rudolf Dipl.-Ing. Vollmer
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.)
Garrett Motion SARL
Honeywell GmbH
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Honeywell GmbH
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Publication date
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Publication of EP0555837A1 publication Critical patent/EP0555837A1/en
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Publication of EP0555837B1 publication Critical patent/EP0555837B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/108—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves having an aerating valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2544—Supply and exhaust type
    • Y10T137/2557—Waste responsive to flow stoppage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/3149—Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
    • Y10T137/3185—Air vent in liquid flow line
    • Y10T137/3294—Valved
    • Y10T137/3331—With co-acting valve in liquid flow path

Definitions

  • the present invention relates to a system separator according to the preamble of claim 1.
  • a system separator is a safety valve that is installed in the drinking water pipe and is intended to prevent backflow from the non-drinking water side.
  • the system separator consists in a known manner of two series-connected backflow preventer and a differential pressure-controlled drain valve, which vents an intermediate chamber between the two backflow preventer.
  • the task of the drain valve is to ventilate the intermediate chamber when the pressure drops below a certain differential pressure between the inlet side and the intermediate chamber, in order to prevent backflow from the outlet side to the inlet side.
  • a system separator 10 which in a known manner has two check valves 16 and 18 connected in series between an inlet 12 and an outlet 14.
  • the space 20 (intermediate chamber) between the two non-return valves 16 and 18 can be vented through a drain valve 22, the drain valve 22 being controlled by the differential pressure between the inlet 12 and the intermediate chamber 20, by a diaphragm 26 prestressed by a spring 24
  • Inlet 12 compares with the pressure in the intermediate chamber 20 to, when falling below a predetermined pressure of z. B. 0.5 bar to vent the intermediate chamber 20 by opening the drain valve 22.
  • the pressures of the medium, generally water, at the inlet 12, in the intermediate chamber 20 and at the outlet 14 can be connected to pressure gauges 28, 30 and 32 at pressure gauges 34, 36 and 38.
  • a differential pressure stabilizer 40 is arranged in the intermediate chamber 20.
  • differential pressure stabilizer 40 can also be integrated into the housing of the system separator 10.
  • the differential pressure stabilizer 40 consists of a cylindrical housing 42 which is provided on one side with an inlet 44 and on the other side with an outlet 46.
  • a membrane 52 is clamped between the two halves 48, 50 of the housing 42 as a pressurized displaceable member.
  • This pressurized displaceable member can also be predetermined by a bellows or a piston.
  • the membrane 52 is stretched between the two halves of a spring plate 54 and a spring 56 is supported between the spring plate 54 and the housing 42.
  • the spring plate 54 On the side facing away from the spring 56, the spring plate 54 has a circumferential sealing edge 58, which is provided for cooperation with an elastic sealing ring 60 inserted into the housing 42.
  • the inlet 44 of the differential pressure stabilizer 40 can be connected to the inlet 12 of the system separator 10 and the outlet 46 of the differential pressure stabilizer 40 is connected to the intermediate chamber 20 of the system separator 10.
  • the preloaded spring 56 determines the level of the differential pressure at which the diaphragm 52 moves.
  • the preload of the spring 56 is to be selected so that this differential pressure lies above the required response pressure of the drain valve 22 and below the opening pressure for the first check valve 16.
  • the drain valve 22 remains closed until the pressure difference between inlet 12 and intermediate chamber 20 becomes smaller than the response pressure of the drain valve 22. This case always occurs when pressure fluctuations in the supply network lead to pressure drops on the inlet side 12 of the system separator 10 lead. Since the intermediate chamber 20 is limited by two tightly closing non-return valves 16, 18, the pressure in the intermediate chamber 20 remains unaffected by pressure fluctuations on the inlet side 12 until the predetermined limit of z. B. 0.5 bar is reached and the drain valve 22 opens, so that there is again a differential pressure above the predetermined limit.
  • the pressure in the intermediate chamber 20 of the system separator 10 follows the pressure fluctuations on the Input side 12.
  • the differential pressure remains essentially constant.
  • the installation of the differential pressure stabilizer 40 makes the inlet pressure a reference variable for the intermediate chamber pressure.
  • the function of the differential pressure stabilizer 40 is effective with appropriate dimensioning of the membrane down to the negative pressure range on the inlet side.
  • FIG. 3 schematically shows a modified embodiment of the system separator 10 according to the invention, in which a pressure limiter 62 is arranged in addition to the differential pressure stabilizer 40.
  • This pressure limiter consists of a membrane 64 pressurized on one side, which is acted upon by the static pressure in the intermediate chamber 20 and is pressed against a prestressed spring 66 into a final position when a predetermined static pressure in the intermediate chamber 20 is exceeded, the chamber having the spring 66 over a vent, not shown, is connected to the atmosphere.
  • the diaphragm 64 moves through the pre-tensioned spring 66 and builds up the pressure in the intermediate chamber, which then leads to ventilation of the intermediate chamber.
  • the response range can be limited to a minimum pressure on the input side, which is in the overpressure range.
  • Fig. 4 shows a diagram which shows the pressure curve over time.
  • p1 the pressure on the input side 12 is designated and p2 denotes the pressure in the intermediate chamber 20. It can be seen that a constant differential pressure p between the input side 12 and the intermediate chamber 20 is predetermined by the arrangement of the differential pressure stabilizer 40. If the static pressure in the intermediate chamber 20 threatens to drop below a predetermined minimum pressure P min , the pressure limiter 62 takes effect and maintains this minimum pressure.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Safety Valves (AREA)
  • Control Of Fluid Pressure (AREA)
  • Debugging And Monitoring (AREA)
  • Seal Device For Vehicle (AREA)
  • Cyclones (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention relates to a system disconnector (10) which is composed of two backflow preventers (16,18), connected one behind the other in the throughflow direction of the medium, and of a discharge valve (22) which vents the intermediate chamber (20), between the two backflow preventers, into the atmosphere. Said system disconnector is provided with a differential-pressure stabiliser (40) which controls the differential pressure between inlet side (12) and intermediate chamber (20) at an approximately constant value. <IMAGE>

Description

Die vorliegende Erfindung betrifft einen Systemtrenner nach dem Gattungsbegriff des Patentanspruches 1.The present invention relates to a system separator according to the preamble of claim 1.

Ein Systemtrenner ist eine Sicherungsarmatur, die in die Trinkwasserleitung eingebaut wird und ein Rückfließen von der Nicht-Trinkwasserseite verhindern soll. Zu diesem Zweck besteht der Systemtrenner in bekannter Weise aus zwei hintereinandergeschalteten Rückflußverhinderern und einem differenzdruckgesteuerten Ablaßventil, welches eine Zwischenkammer zwischen den beiden Rückflußverhinderern entlüftet. Die Aufgabe des Ablaßventils ist es, bei Unterschreiten eines bestimmten Differenzdruckes zwischen Eingangsseite und Zwischenkammer, die Zwischenkammer zu belüften, um damit ein Rückfließen von der Ausgangsseite zur Eingangsseite zu verhindern.A system separator is a safety valve that is installed in the drinking water pipe and is intended to prevent backflow from the non-drinking water side. For this purpose, the system separator consists in a known manner of two series-connected backflow preventer and a differential pressure-controlled drain valve, which vents an intermediate chamber between the two backflow preventer. The task of the drain valve is to ventilate the intermediate chamber when the pressure drops below a certain differential pressure between the inlet side and the intermediate chamber, in order to prevent backflow from the outlet side to the inlet side.

Bei den bekannten und an sich bewährten Systemtrennern hat sich jedoch als Nachteil herausgestellt, daß bei Nulldurchfluß und den üblichen Druckschwankungen im Rohrnetz auf der Eingangsseite des Systemtrenners der zur Sicherheit erforderliche Differenzdruck kurzfristig unterschritten wird, wodurch das differenzdruckgesteuerte Ablaßventil anspricht und kurzzeitig Wasser aus der Zwischenkammer abläßt. Hierdurch entsteht einerseits ein unerwünschter Wasserverlust und andererseits wird dieses ständige Wasserablassen durch den nicht-fachkundigen Benutzer als Fehlverhalten des Systemtrenners interpretiert.In the known and proven system isolators, however, it has turned out to be a disadvantage that at zero flow and the usual pressure fluctuations in the pipe network on the input side of the system isolator, the differential pressure required for safety is briefly undershot, as a result of which the differential pressure-controlled drain valve responds and briefly drains water from the intermediate chamber . On the one hand, this creates a unwanted water loss and on the other hand this constant water drainage is interpreted by the non-expert user as a malfunction of the system separator.

Es ist daher die Aufgabe der vorliegenden Erfindung, den eingangs erwähnten Systemtrenner bekannter Bauart so weiterzubilden, daß ein ständiger Wasserverlust verhindert wird, ohne daß hierbei die Sicherungsfunktion des Systemtrenners beeinträchtigt wird. Diese Aufgabe wird gelöst durch die kennzeichnenden Merkmale des Patentanspruches 1. Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Systemtrenners sind den abhängigen Ansprüchen entnehmbar.It is therefore the object of the present invention to develop the system separator of the known type mentioned at the outset in such a way that constant water loss is prevented without the safety function of the system separator being impaired. This object is achieved by the characterizing features of claim 1. Further advantageous configurations of the system separator according to the invention can be found in the dependent claims.

Anhand eines in den Figuren der beiliegenden Zeichnung dargestellten Ausführungsbeispieles sei im folgenden der Aufbau und die Funktion des erfindungsgemäßen Systemtrenners näher beschrieben. Es zeigen:

Fig. 1
einen durch Einbau eines Differenzdruckstabilisators erfindungsgemäß modifizierten Systemtrenner;
Fig. 2
die Ausgestaltung eines Differenzdruckstabilisators;
Fig. 3
eine Modifikation des erfindungsgemäßen Systemtrenners; und
Fig. 4
ein Diagramm zur Erläuterung des erfindungsgemäßen Systemtrenners.
The structure and function of the system separator according to the invention will be described in more detail below with reference to an exemplary embodiment shown in the figures of the accompanying drawing. Show it:
Fig. 1
a system separator modified according to the invention by installing a differential pressure stabilizer;
Fig. 2
the design of a differential pressure stabilizer;
Fig. 3
a modification of the system separator according to the invention; and
Fig. 4
a diagram for explaining the system separator according to the invention.

Gemäß Fig. 1 ist ein Systemtrenner 10 dargestellt, der in bekannter Weise zwei zwischen einem Einlaß 12 und einem Auslaß 14 in Reihe geschaltete Rückflußverhinderer 16 und 18 aufweist. Der Raum 20 (Zwischenkammer) zwischen den beiden Rückflußverhinderern 16 und 18 ist durch ein Ablaßventil 22 entlüftbar, wobei das Ablaßventil 22 von dem Differenzdruck zwischen dem Einlaß 12 und der Zwischenkammer 20 gesteuert wird, indem eine durch eine Feder 24 vorgespannte Membran 26 den Druck am Einlaß 12 mit dem Druck in der Zwischenkammer 20 vergleicht, um bei Unterschreitung eines vorbestimmten Druckes von z. B. 0,5 bar die Zwischenkammer 20 durch öffnung des Ablaßventiles 22 zu entlüften.1, a system separator 10 is shown, which in a known manner has two check valves 16 and 18 connected in series between an inlet 12 and an outlet 14. The space 20 (intermediate chamber) between the two non-return valves 16 and 18 can be vented through a drain valve 22, the drain valve 22 being controlled by the differential pressure between the inlet 12 and the intermediate chamber 20, by a diaphragm 26 prestressed by a spring 24 Inlet 12 compares with the pressure in the intermediate chamber 20 to, when falling below a predetermined pressure of z. B. 0.5 bar to vent the intermediate chamber 20 by opening the drain valve 22.

Die Drücke des Mediums, im allgemeinen Wasser, am Einlaß 12, in der Zwischenkammer 20 und am Auslaß 14 sind über Druckentnahmestutzen 28, 30 und 32 an Manometer 34, 36 und 38 anschließbar.The pressures of the medium, generally water, at the inlet 12, in the intermediate chamber 20 and at the outlet 14 can be connected to pressure gauges 28, 30 and 32 at pressure gauges 34, 36 and 38.

Gemäß der vorliegenden Erfindung ist zwischen dem Druckentnahmestutzen 28, d.h. zwischen dem Einlaß 12 und dem Druckentnahmestutzen 30, d.h. der Zwischenkammer 20 ein Differenzdruckstabilisator 40 angeordnet.According to the present invention, between the pressure tap 28, i.e. between the inlet 12 and the pressure tap 30, i.e. a differential pressure stabilizer 40 is arranged in the intermediate chamber 20.

Dem Fachmann liegt es auf der Hand, daß dieser Differenzdruckstabilisator 40 auch in das Gehäuse des Systemtrenners 10 integriert sein kann.It is obvious to the person skilled in the art that this differential pressure stabilizer 40 can also be integrated into the housing of the system separator 10.

Gemäß Fig. 2 besteht der Differenzdruckstabilisator 40 aus einem zylindrischen Gehäuse 42, das auf einer Seite mit einem Einlaß 44 und auf der anderen Seite mit einem Auslaß 46 versehen ist. Zwischen den beiden Hälften 48, 50 des Gehäuses 42 ist als druckbeaufschlagtes verschiebliches Organ eine Membran 52 eingespannt. Dieses druckbeaufschlagte verschiebliche Organ kann ebenso durch einen Faltenbalg oder einen Kolben vorgegeben sein.2, the differential pressure stabilizer 40 consists of a cylindrical housing 42 which is provided on one side with an inlet 44 and on the other side with an outlet 46. A membrane 52 is clamped between the two halves 48, 50 of the housing 42 as a pressurized displaceable member. This pressurized displaceable member can also be predetermined by a bellows or a piston.

Die Membran 52 ist zwischen die beiden Hälften eines Federtellers 54 gespannt und eine Feder 56 stützt sich zwischen dem Federteller 54 und dem Gehäuse 42 ab. Auf der der Feder 56 abgewandten Seite weist der Federteller 54 eine umlaufende Abdichtkante 58 auf, die zum Zusammenwirken mit einem in das Gehäuse 42 eingelegten elastischen Abdichtring 60 vorgesehen ist. Der Einlaß 44 des Differenzdruckstabilisators 40 ist mit dem Einlaß 12 des Systemtrenners 10 verbindbar und der Auslaß 46 des Differenzdruckstabilisators 40 wird mit der Zwischenkammer 20 des Systemtrenners 10 verbunden.The membrane 52 is stretched between the two halves of a spring plate 54 and a spring 56 is supported between the spring plate 54 and the housing 42. On the side facing away from the spring 56, the spring plate 54 has a circumferential sealing edge 58, which is provided for cooperation with an elastic sealing ring 60 inserted into the housing 42. The inlet 44 of the differential pressure stabilizer 40 can be connected to the inlet 12 of the system separator 10 and the outlet 46 of the differential pressure stabilizer 40 is connected to the intermediate chamber 20 of the system separator 10.

Aus diesem Aufbau ergibt sich folgende Funktion:
Die vorgespannte Feder 56 bestimmt die Höhe des Differenzdrucks, bei dem sich die Membrane 52 bewegt. Die Vorspannung der Feder 56 ist so zu wählen, daß dieser Differenzdruck oberhalb des geforderten Ansprechdrucks des Ablaßventils 22 und unterhalb des öffnungsdrucks für den ersten Rückflußverhinderer 16 liegt.The following function results from this structure:
The preloaded spring 56 determines the level of the differential pressure at which the diaphragm 52 moves. The preload of the spring 56 is to be selected so that this differential pressure lies above the required response pressure of the drain valve 22 and below the opening pressure for the first check valve 16.

Unter den kritischen Betriebsbedingungen, d.h. Systemtrenner 10 unter Betriebsdruck jedoch Nulldurchfluß bleibt das Ablaßventil 22 solange geschlossen, bis die Druckdifferenz zwischen Einlaß 12 und Zwischenkammer 20 kleiner wird als der Ansprechdruck des Ablaßventiles 22. Dieser Fall tritt immer dann ein, wenn Druckschwankungen im Versorgungsnetz zu Druckabsenkungen auf der Eingangsseite 12 des Systemtrenners 10 führen. Da die Zwischenkammer 20 durch zwei dicht schließende Rückflußverhinderer 16, 18 begrenzt wird, bleibt der Druck in der Zwischenkammer 20 von Druckschwankungen auf der Eingangsseite 12 unbeeinflußt, bis der vorbestimmte Grenzwert von z. B. 0,5 bar erreicht wird und das Ablaßventil 22 öffnet, damit sich wieder ein über dem vorbestimmten Grenzwert liegender Differenzdruck ergibt.Under critical operating conditions, i.e. System separator 10 under operating pressure but zero flow, the drain valve 22 remains closed until the pressure difference between inlet 12 and intermediate chamber 20 becomes smaller than the response pressure of the drain valve 22. This case always occurs when pressure fluctuations in the supply network lead to pressure drops on the inlet side 12 of the system separator 10 lead. Since the intermediate chamber 20 is limited by two tightly closing non-return valves 16, 18, the pressure in the intermediate chamber 20 remains unaffected by pressure fluctuations on the inlet side 12 until the predetermined limit of z. B. 0.5 bar is reached and the drain valve 22 opens, so that there is again a differential pressure above the predetermined limit.

Durch Einbau des Differenzdruckstabilisators 40 zwischen den Druckentnahmestutzen 28 und 30 erfolgt bei einer eingangsseitigen Druckabsenkung eine Bewegung der Membran 52 unter Einwirkung der vorgespannten Feder 56. Da die Zwischenkammer 20 durch die beiden Rückflußverhinderer 16 und 18 verschlossen ist, führt die durch die eingangsseitige Druckabsenkung eingeleitete Bewegung der Membrane 52 ebenfalls zu einer Druckabsenkung in der Zwischenkammer 20 und verhindert damit, daß der zwischen Eingangsseite 12 und Zwischenkammer 20 anstehende Differenzdruck durch Druckschwankungen auf der Eingangsseite beeinflußt wird.By installing the differential pressure stabilizer 40 between the pressure tapping ports 28 and 30, a movement of the diaphragm 52 takes place under the action of the prestressed spring 56 in the event of a pressure drop on the input side. Since the intermediate chamber 20 is closed by the two non-return valves 16 and 18, the movement initiated by the pressure drop on the input side leads the membrane 52 also to a pressure drop in the intermediate chamber 20 and thus prevents the differential pressure between the input side 12 and the intermediate chamber 20 from being influenced by pressure fluctuations on the input side.

Mit anderen Worten ausgedrückt folgt der Druck in der Zwischenkammer 20 des Systemtrenners 10 den Druckschwankungen auf der Eingangsseite 12. Dadurch bleibt der Differenzdruck im wesentlichen konstant. Der Eingangsdruck wird durch den Einbau des Differenzdruckstabilisators 40 zur Führungsgröße für den Zwischenkammerdruck.In other words, the pressure in the intermediate chamber 20 of the system separator 10 follows the pressure fluctuations on the Input side 12. As a result, the differential pressure remains essentially constant. The installation of the differential pressure stabilizer 40 makes the inlet pressure a reference variable for the intermediate chamber pressure.

Hierdurch treten, solange die eingebauten Rückflußverhinderer einwandfrei funktionieren, keine Störungen durch eingangsseitige Druckschwankungen mehr auf, die zu einem ungewollten öffnen des Ablaßventiles führen. Die Funktion des Differenzdruckstabilisators 40 ist bei entsprechender Bemessung der Membrane bis in den Unterdruckbereich auf der Eingangsseite wirksam.As a result, as long as the built-in check valves function properly, there are no more disturbances due to pressure fluctuations on the inlet side, which lead to an unintentional opening of the drain valve. The function of the differential pressure stabilizer 40 is effective with appropriate dimensioning of the membrane down to the negative pressure range on the inlet side.

Fig. 3 zeigt schematisch eine modifizierte Ausführungsform des erfindungsgemäßen Systemtrenners 10, bei dem zusätzlich zu dem Differenzdruckstabilisator 40 noch ein Druckbegrenzer 62 angeordnet ist. Dieser Druckbegrenzer besteht aus einer einseitig druckbeaufschlagten Membrane 64, die vom statischen Druck in der Zwischenkammer 20 beaufschlagt wird und gegen eine vorgespannte Feder 66 beim überschreiten eines vorbestimmten statischen Druckes in der Zwischenkammer 20 in eine Endlage gedrückt wird, wobei die die Feder 66 aufweisende Kammer über eine nicht-dargestellte Entlüftungsöffnung an die Atmosphäre angeschlossen ist. Beim Absenken unter den vorbestimmten statischen Druck in der Zwischenkammer 20 bewegt sich die Membrane 64 durch die vogespannte Feder 66 und baut den Druck in der Zwischenkammer auf, was dann zur Belüftung der Zwischenkammer führt. Hierdurch kann der Ansprechbereich auf einen minimalen Druck auf der Eingangsseite begrenzt werden, der im überdruckbereich liegt.3 schematically shows a modified embodiment of the system separator 10 according to the invention, in which a pressure limiter 62 is arranged in addition to the differential pressure stabilizer 40. This pressure limiter consists of a membrane 64 pressurized on one side, which is acted upon by the static pressure in the intermediate chamber 20 and is pressed against a prestressed spring 66 into a final position when a predetermined static pressure in the intermediate chamber 20 is exceeded, the chamber having the spring 66 over a vent, not shown, is connected to the atmosphere. When lowering below the predetermined static pressure in the intermediate chamber 20, the diaphragm 64 moves through the pre-tensioned spring 66 and builds up the pressure in the intermediate chamber, which then leads to ventilation of the intermediate chamber. As a result, the response range can be limited to a minimum pressure on the input side, which is in the overpressure range.

Fig. 4 zeigt ein Diagramm, welches den Druckverlauf über der Zeit darstellt. Mit p₁ ist der Druck auf der Eingangsseite 12 bezeichnet und p₂ bezeichnet den Druck in der Zwischenkammer 20. Man erkennt, daß durch die Anordnung des Differenzdruckstabilisators 40 ein konstanter Differenzdruck p zwischen Eingangsseite 12 und Zwischenkammer 20 vorgegeben wird. Falls der statische Druck in der Zwischenkammer 20 unter einen vorbestimmten Minimaldruck Pmin abzusinken droht, wird der Druckbegrenzer 62 wirksam und hält diesen Minimaldruck bei.Fig. 4 shows a diagram which shows the pressure curve over time. With p₁ the pressure on the input side 12 is designated and p₂ denotes the pressure in the intermediate chamber 20. It can be seen that a constant differential pressure p between the input side 12 and the intermediate chamber 20 is predetermined by the arrangement of the differential pressure stabilizer 40. If the static pressure in the intermediate chamber 20 threatens to drop below a predetermined minimum pressure P min , the pressure limiter 62 takes effect and maintains this minimum pressure.

Claims (6)

Systemtrenner, bestehend aus zwei in Durchflußrichtung eines Mediums hintereinander geschalteten Rückflußverhinderern und einem die Zwischenkammer zwischen den beiden Rückflußverhinderern in die Atmosphäre entlüftenden Ablaßventil, welches von dem Druck zwischen der Eingangsseite und der Zwischenkammer gesteuert wird, gekennzeichnet durch die Anordnung eines Differenzdruckstabilisators (40) zwischen Eingangsseite (12) und Zwischenkammer (20).System separator, consisting of two non-return valves connected in series in the direction of flow of a medium and a drain valve venting the intermediate chamber between the two non-return valves into the atmosphere, which is controlled by the pressure between the inlet side and the intermediate chamber, characterized by the arrangement of a differential pressure stabilizer (40) between the inlet side (12) and intermediate chamber (20). Systemtrenner nach Anspruch 1, dadurch gekennzeichnet, daß der Differenzdruckstabilisator (40) aus einem dichtend in einem Gehäuse (42) verschieblichen Organ (52) besteht, das einerseits durch eine Feder (56) und den Zwischenkammerdruck vorgespannt ist und andererseits von dem Druck des Mediums auf der Eingangsseite (12) beaufschlagt wird.System separator according to claim 1, characterized in that the differential pressure stabilizer (40) consists of an element (52) which can be moved in a sealing manner in a housing (42) and which is pretensioned on the one hand by a spring (56) and the intermediate chamber pressure and on the other hand by the pressure of the medium is acted upon on the input side (12). Systemtrenner nach Anspruch 2, dadurch gekennzeichnet, daß der Differenzdruckstabilisator (40) zwischen zwei Druckentnahmestutzen (28,30) angeordnet ist.System separator according to claim 2, characterized in that the differential pressure stabilizer (40) is arranged between two pressure tapping sockets (28, 30). Systemtrenner nach Anspruch 2, dadurch gekennzeichnet, daß der Differenzdruckstabilisator (40) in das Gehäuse des Systemtrenners (10) integriert ist.System separator according to claim 2, characterized in that the differential pressure stabilizer (40) is integrated in the housing of the system separator (10). Systemtrenner nach einem der Ansprüche 1 bis 4, gekennzeichnet durch die zusätzliche Anordnung eines Druckbegrenzers (62), bestehend aus einem weiteren dichtend in einem Gehäuse verschiebbaren Organ (64), das einerseits von dem Mediumsdruck in der Zwischenkammer (20) und andererseits von einer Feder (66) beaufschlagt wird.System separator according to one of claims 1 to 4, characterized by the additional Arrangement of a pressure limiter (62), consisting of a further member (64) which can be moved sealingly in a housing and which is acted upon on the one hand by the medium pressure in the intermediate chamber (20) and on the other hand by a spring (66). Systemtrenner nach Anspruch 5, gekennzeichnet durch die Vereinigung von Differenzdruckstabilisator (40) und Druckbegrenzer (62) in einem Gehäuse.System separator according to claim 5, characterized by the combination of differential pressure stabilizer (40) and pressure limiter (62) in one housing.
EP93102087A 1992-02-14 1993-02-11 Backflow preventer Expired - Lifetime EP0555837B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4204386 1992-02-14
DE4204386A DE4204386C2 (en) 1992-02-14 1992-02-14 System separator

Publications (2)

Publication Number Publication Date
EP0555837A1 true EP0555837A1 (en) 1993-08-18
EP0555837B1 EP0555837B1 (en) 1996-10-23

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ID=6451687

Family Applications (1)

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EP93102087A Expired - Lifetime EP0555837B1 (en) 1992-02-14 1993-02-11 Backflow preventer

Country Status (5)

Country Link
US (1) US5363875A (en)
EP (1) EP0555837B1 (en)
AT (1) ATE144571T1 (en)
CA (1) CA2088748C (en)
DE (2) DE4204386C2 (en)

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EP0671514A2 (en) * 1993-11-02 1995-09-13 Kurt Michael Dipl.-Ing. Desch Combined bathtub supply and overflow fixture with shower diverter valve and integrated backflow preventer
DE202009013771U1 (en) 2009-10-02 2010-07-22 Hidde, Axel R., Dr. System or pipe separator in modular design as a cartridge

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DE19902574C1 (en) 1999-01-22 2000-10-05 Rudolf Vollmer System separator
FR2803009B1 (en) * 1999-12-24 2002-03-22 Watts Eurotherm DEVICE FOR CONTROLLING THE FLOW OF A FLUID USING A DIFFERENTIAL VALVE
ES2178915B1 (en) * 2000-03-07 2004-04-16 Plasticos Mondragon, S.A. PERFECTED MEMBRANE HYDRAULIC VALVE, FOR FLUID FLOW REGULATION.
EP1334761A1 (en) * 2002-02-07 2003-08-13 Bucher Guyer AG Cross-flow filtration device and backflow throttle valve for use in such an installation and method for operating a such installation
AU2003282978A1 (en) * 2002-10-18 2004-05-04 Watts Regulator Co. Spill-resistant relief valve
DE10325388A1 (en) * 2003-05-30 2004-12-30 Iat Ingolstadt Armaturen Technologie Gmbh System separator used as a safety fitting in a drinking water pipe comprises an inlet-side reflux preventor with a reflux-preventing section of a membrane, and a drain valve with a drain section of the same membrane
US7293576B2 (en) * 2005-03-28 2007-11-13 Potter Electric Signal Company Single-piece manifold with reduced pressure arrangement
DE102005031422C5 (en) 2005-07-04 2012-09-27 Hans Sasserath & Co. Kg Backflow
DE102010021805A1 (en) 2009-05-27 2011-06-16 Desch, Kurt Michael, Dipl.-Ing. (FH) Hydraulic-three-chamber-main system separator, has control piston, where surfaces of control piston and spring base-piston are same in size, and control piston closes one relief valve
DE102010052837A1 (en) 2010-03-03 2011-12-22 Kurt Michael Desch Hydraulic three-chamber system separating device, has control pistons pushed by force of over-lifting spring or movable back and forth based on reduced pressure differences during flow-through and idle position
DE102010024786A1 (en) 2010-06-23 2011-12-29 Honeywell Technologies S.A.R.L. Backflow
DE102011013718A1 (en) 2011-03-11 2012-09-13 Honeywell Technologies Sarl Backflow
EP2617904A1 (en) 2012-01-18 2013-07-24 Honeywell Technologies Sarl System disconnector
EP2828564B1 (en) * 2012-03-19 2020-04-29 Ab Durgo Manually operable tab valve device
DE102012019437A1 (en) 2012-10-04 2014-04-10 Honeywell Technologies Sarl System separator for drainage purpose, has pressure tapping valves that are inserted directly in feed connection from inlet chamber and outlet chamber or from inlet chamber and intermediate chamber
EP2801672B1 (en) 2013-05-07 2017-06-28 Honeywell Technologies Sarl System separator
DE202016104221U1 (en) 2016-08-01 2016-10-10 Honeywell Technologies Sarl Backflow
EP3415825A1 (en) 2017-06-14 2018-12-19 Honeywell Technologies Sarl Heat circuit refilling device
US11521757B2 (en) * 2018-05-25 2022-12-06 Curtiss-Wright Flow Control Corporation Inadvertent actuation block valve for a small modular nuclear reactor

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Publication number Priority date Publication date Assignee Title
EP0671514A2 (en) * 1993-11-02 1995-09-13 Kurt Michael Dipl.-Ing. Desch Combined bathtub supply and overflow fixture with shower diverter valve and integrated backflow preventer
EP0671514A3 (en) * 1993-11-02 1996-03-06 Desch Kurt Michael Combined bathtub supply and overflow fixture with shower diverter valve and integrated backflow preventer.
DE202009013771U1 (en) 2009-10-02 2010-07-22 Hidde, Axel R., Dr. System or pipe separator in modular design as a cartridge
DE102009048093A1 (en) 2009-10-02 2011-04-07 Hidde, Axel R., Dr. System/pipe separator for physical separation of drinking water system from heating system, has valve shaft including spring at its open end between housing guide and/or shaft guide and fixedly installed fastener with locking ring
DE102009048093B4 (en) 2009-10-02 2022-09-01 Axel R. Hidde System or pipe separator in modular design as a cartridge

Also Published As

Publication number Publication date
DE4204386C2 (en) 1994-01-20
CA2088748A1 (en) 1993-08-15
CA2088748C (en) 1997-03-18
DE59304227D1 (en) 1996-11-28
US5363875A (en) 1994-11-15
EP0555837B1 (en) 1996-10-23
DE4204386A1 (en) 1993-08-26
ATE144571T1 (en) 1996-11-15

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