EP1004715A1 - Backflow preventer - Google Patents

Backflow preventer Download PDF

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Publication number
EP1004715A1
EP1004715A1 EP99123459A EP99123459A EP1004715A1 EP 1004715 A1 EP1004715 A1 EP 1004715A1 EP 99123459 A EP99123459 A EP 99123459A EP 99123459 A EP99123459 A EP 99123459A EP 1004715 A1 EP1004715 A1 EP 1004715A1
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EP
European Patent Office
Prior art keywords
assembly
system separator
tie rods
drain valve
separator according
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.)
Withdrawn
Application number
EP99123459A
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German (de)
French (fr)
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.)
Vollmer Ingenieurbuero
Original Assignee
Vollmer Ingenieurbuero
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 Vollmer Ingenieurbuero filed Critical Vollmer Ingenieurbuero
Publication of EP1004715A1 publication Critical patent/EP1004715A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a system separator according to the generic term of Claim 1.
  • a system separator is a safety valve that is installed in a drinking water pipe to prevent non-drinking water from flowing back into the drinking water pipe.
  • 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 check valves.
  • the axis of the drain valve usually forms an angle of 90 ° with the flow axis, wherein to operate the drain valve one between a housing and a Clamped diaphragm is used.
  • the installation opening of the drain valve serves at the same time for removing and installing the non-return valve without removing the housing itself the need to expand the pipeline, a requirement that is reflected in both national standards and is also anchored in the European draft standard EN 12729.
  • System separators are known in many ways and can e.g. DE-OS'en 21 49 406, 58 54003 and 29 30 819 and U.S. Patents 2,389,412, 2,491,604, 2,503,424, 3,906,987 and 4,044,787.
  • the system separators with the internal parts removed can be shown without having to remove the system separator from the pipeline a cast cross-shaped housing.
  • System separators are also known, in which the backflow preventer and the drain valve are arranged on a common axis. These system separators in axial design, such as e.g. shown in DE-PS 2 424 978, are cheaper to manufacture, but in The relevant standards require replacement of the internal parts without removing the device itself The need to remove the pipeline is not possible with these system separators. she do not meet the requirements of national and international standards and cannot be certified as a result.
  • the system separator consists of a pipe made from a commercially available pipe non-pressurized housing 1, which has a first backflow preventer 2 Drain valve 4 and a second backflow preventer 3 with its housing 14.
  • a drain pipe socket 5 is welded to the housing 1.
  • the housing 1 with the Functional elements 2, 3, 4 are connected via tie rods 6, 6 'between an input connection 7 and an output connection 8, the housing 1 being held by seals 9, 10 is flat on the end face and sealed without an undercut.
  • the tie rods are at the same time Centering and anti-rotation device for the housing 1. When removing the housing 1 At least two tie rods remain in the installed state, fix the pipeline and center the housing 1 when reinstalling.
  • the drain valve 4 consists of a Bellows base 11 and a metal bellows 12 and acts with a valve seat 13 Valve plug 15 together, which on the housing 14 of the outlet-side check valve 3 is molded.
  • the welded to the housing 1 pipe socket 5 is used to connect a Drain funnel, via which a connection to a sewage pipe can be established and secures the housing 1 against rotation.
  • Pressure tapping points 16, 17, 18 are for the Connection of measuring and testing devices provided to the inlet pressure, the To be able to measure the intermediate chamber pressure and the outlet pressure.
  • the function of the system separator is described with reference to FIG. 1.
  • the water arrives through an input chamber 19 into the system separator.
  • pressure builds up in the Inlet chamber 19 remains the inlet-side backflow preventer 2 up to one predetermined pressure closed.
  • the metal bellows 12 expands and moves it Drain valve 4 until the valve seat 13 comes to bear sealingly on the valve cone 15.
  • the Metallbalg 12 has spring properties and was designed so that the usual Setpoint spring for determining the response pressure can be omitted.
  • When exceeding the preset pressure in the input chamber 19 opens the backflow preventer 2 and fills an intermediate chamber 20. After a slight increase in pressure in the intermediate chamber 20 opens the outlet-side backflow preventer 3 and the water flows through one Exit chamber 21 to a consumer.
  • the housing 1 is not under pressure acted upon; it only serves as a receptacle for the drain valve 4 with the backflow preventer 2 and the housing 14 with the outlet-side backflow preventer 3 and Distance between the drain valve 4 and the valve plug 15.
  • the housing when opening the drain valve 4 e.g. when pressure drops on the Effective splash protection on the input side and enables 5 on the pipe socket Connection of a sewage pipe.

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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)
  • Check Valves (AREA)
  • Details Of Valves (AREA)

Abstract

An isolation valve assembly has a modular construction comprising two non return valves (2,3) between which is fitted a venting valve (4,5) to drain off any fluid trapped between the non return valves when the valves are closed. The valves are fitted into a single housing which is clamped between two end flanges (7,8) of the pipeline and which is held in place by tensile bolts through the flanges. To remove the valve assembly the tensile bolts are loosened and one or two removed to free the assembly. The ends of the assembly are fitted with O-ring seals.

Description

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

Ein Systemtrenner ist eine Sicherungsarmatur, die in eine Trinkwasserleitung eingebaut wird, um ein Rückfließen von Nichttrinkwasser in die Trinkwasserleitung zu verhindern. 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 Achse des Ablaßventils bildet üblicherweise mit der Durchflußachse einen Winkel von 90°, wobei zur Betätigung des Ablaßventiles eine zwischen einem Gehäuse und einem Abschlußdeckel eingespannte Membrane dient. Die Einbauöffnung des Ablaßventiles dient gleichzeitig zum Aus- und Einbau der Rückflußverhinderer, ohne das Gehäuse selbst aus der Rohrleitung ausbauen zu müssen, eine Forderung, die sowohl in nationalen Normen als auch im europäischen Normentwurf EN 12729 verankert ist. Beispiele für solche Systemtrenner sind in vielfältiger Weise bekannt und können z.B. den DE-OS'en 21 49 406, 58 54003 und 29 30 819 sowie den US-PS'en 2 389 412, 2 491 604, 2 503 424, 3 906 987 und 4 044 787 entnommen werden. Die Systemtrenner, bei denen die Innenteile ausgebaut werden können, ohne den Systemtrenner aus der Rohrleitung ausbauen zu müssen, weisen ein gegossenes kreuzförmiges Gehäuse auf.A system separator is a safety valve that is installed in a drinking water pipe to prevent non-drinking water from flowing back into the drinking water pipe. To 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 check valves. The The axis of the drain valve usually forms an angle of 90 ° with the flow axis, wherein to operate the drain valve one between a housing and a Clamped diaphragm is used. The installation opening of the drain valve serves at the same time for removing and installing the non-return valve without removing the housing itself the need to expand the pipeline, a requirement that is reflected in both national standards and is also anchored in the European draft standard EN 12729. Examples of such System separators are known in many ways and can e.g. DE-OS'en 21 49 406, 58 54003 and 29 30 819 and U.S. Patents 2,389,412, 2,491,604, 2,503,424, 3,906,987 and 4,044,787. The system separators with the internal parts removed can be shown without having to remove the system separator from the pipeline a cast cross-shaped housing.

Bei diesen Systemtrennern hat sich als Nachteil herausgestellt, daß sie durch die notwendige Montageöffnung unnötig groß bauen und viele Einzelteile benötigen, welche die Wartung erschweren und die Herstellkosten erhöhen.A disadvantage of these system isolators has been that they have the necessary Build the assembly opening unnecessarily large and need many individual parts, which require maintenance complicate and increase the manufacturing costs.

Es sind auch Systemtrenner bekannt, bei denen die Rückflußverhinderer und das Ablaßventil auf einer gemeinsamen Achse angeordnet sind. Diese Systemtrenner in axialer Bauform, wie z.B in der DE-PS 2 424 978 dargestellt, sind zwar billiger in der Herstellung, aber der in den einschlägigen Normen geforderte Austausch der Innenteile, ohne das Gerät selbst aus der Rohrleitung ausbauen zu müssen, ist bei diesen Systemtrennern nicht möglich. Sie erfüllen damit nicht die Anforderungen der nationalen und internationalen Normen und können dadurch nicht zertifiziert werden.System separators are also known, in which the backflow preventer and the drain valve are arranged on a common axis. These system separators in axial design, such as e.g. shown in DE-PS 2 424 978, are cheaper to manufacture, but in The relevant standards require replacement of the internal parts without removing the device itself The need to remove the pipeline is not possible with these system separators. she do not meet the requirements of national and international standards and cannot be certified as a result.

Es ist daher die Aufgabe der vorliegenden Erfindung, einen Systemtrenner der eingangs genannten Art so auszubilden, daß der Ausbau der Rückflußverhinderer und des Ablaßventiles, ohne die Rohrverbindungen zu lösen, möglich ist und die Zahl der Einzelteile wesentlich verringert wird, wodurch die Betriebssicherheit erhöht, die Wartung vereinfacht und die Herstellkosten spürbar gesenkt werden.It is therefore the object of the present invention to provide a system separator mentioned type so that the expansion of the backflow preventer and Drain valve is possible without loosening the pipe connections and the number of individual parts is significantly reduced, which increases operational safety and simplifies maintenance and the manufacturing costs are significantly reduced.

Die Lösung dieser Aufgabe gelingt gemäß den kennzeichnenden Markmalen des Patentanspruches 1.This problem is solved in accordance with the characteristic features of the Claim 1.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Systemtrenners sind den Unteransprüchen entnehmbar.Further advantageous embodiments of the system separator according to the invention are the Removable subclaims.

Anhand eines in den Figuren 1, 2, 3 und 4 der beiliegenden Zeichnungen dargestellten Ausführungsbeispieles sei die Erfindung im folgenden näher erläutert.Using one shown in Figures 1, 2, 3 and 4 of the accompanying drawings Exemplary embodiment, the invention is explained in more detail below.

Es zeigen:

Fig. 1
einen Axialschnitt durch den erfindungsgemäßen Systemtrenner; und
Fig. 2
einen Systemtrenner, bei dem zwei Zuganker ausgebaut sind und die Baugruppe ausgebaut werden kann;
Fig. 3
einen Systemtrenner im Schnitt mit dem Rohrstutzen und den Zugankern als Verdrehsicherung;
Fig. 4
die ausgebaute Baugruppe mit Zuganker und mit Innensechskantschrauben.
Show it:
Fig. 1
an axial section through the system separator according to the invention; and
Fig. 2
a system separator in which two tie rods are removed and the assembly can be removed;
Fig. 3
a system separator in section with the pipe socket and the tie rods to prevent rotation;
Fig. 4
the removed assembly with tie rod and hexagon socket screws.

Gemäß Fig. 1 besteht der Systemtrenner aus einem aus handelsüblichem Rohr gefertigten nicht druckbeaufschlagten Gehäuse 1, welches einen ersten Rückflußverhinderer 2, ein Ablaßventil 4 und einen zweiten Rückflußverhinderer 3 mit seinem Gehäuse 14 aufnimmt. Am Gehäuse 1 ist ein Ablaufrohrstutzen 5 angeschweißt. Das Gehäuse 1 mit den Funktionselementen 2, 3, 4 wird über Zuganker 6, 6' zwischen einem Eingangsanschluß 7 und einem Ausgangsanschluß 8 gehalten, wobei das Gehäuse 1 durch Dichtungen 9, 10 stirnseitig flach und ohne Hinterschneidung abgedichtet ist. Die Zuganker sind gleichzeitig Zentrierung und Verdrehsicherung für das Gehäuse 1. Beim Ausbau des Gehäuses 1 verbleiben mindestens zwei Zuganker in eingebautem Zustand, fixieren die Rohrleitung und zentrieren das Gehäuse 1 beim Wiedereinbau. Das Ablaßventil 4 besteht aus einem Balgboden 11 und einem Metallbalg 12 und wirkt mit einem Ventilsitz 13 mit einem Ventilkegel 15 zusammen, der am Gehäuse 14 des ausgangsseitigen Rückflußverhinderers 3 angeformt ist. Der am Gehäuse 1 angeschweißte Rohrstutzen 5 dient dem Anschluß eines Ablauftrichters, über den eine Verbindung zu einer Abwasserleitung hergestellt werden kann und sichert das Gehäuse 1 gegen Verdrehung. Druckentnahmestellen 16, 17, 18 sind für den Anschluß von Mess- und Prüfgeräten vorgesehen, um den Eingangsdruck, den Zwischenkammerdruck und den Ausgangsdruck messen zu können.According to FIG. 1, the system separator consists of a pipe made from a commercially available pipe non-pressurized housing 1, which has a first backflow preventer 2 Drain valve 4 and a second backflow preventer 3 with its housing 14. A drain pipe socket 5 is welded to the housing 1. The housing 1 with the Functional elements 2, 3, 4 are connected via tie rods 6, 6 'between an input connection 7 and an output connection 8, the housing 1 being held by seals 9, 10 is flat on the end face and sealed without an undercut. The tie rods are at the same time Centering and anti-rotation device for the housing 1. When removing the housing 1 At least two tie rods remain in the installed state, fix the pipeline and center the housing 1 when reinstalling. The drain valve 4 consists of a Bellows base 11 and a metal bellows 12 and acts with a valve seat 13 Valve plug 15 together, which on the housing 14 of the outlet-side check valve 3 is molded. The welded to the housing 1 pipe socket 5 is used to connect a Drain funnel, via which a connection to a sewage pipe can be established and secures the housing 1 against rotation. Pressure tapping points 16, 17, 18 are for the Connection of measuring and testing devices provided to the inlet pressure, the To be able to measure the intermediate chamber pressure and the outlet pressure.

Anhand der Fig. 1 wird die Funktion des Systemtrenners beschrieben. Das Wasser gelangt durch eine Eingangskammer 19 in den Systemtrenner. Beim Druckaufbau in der Eingangskammer 19 bleibt der eingangsseitige Rückflußverhinderer 2 bis zu einem vorbestimmten Druck geschlossen. Dabei dehnt sich der Metallbalg 12 aus und bewegt das Ablaßventil 4, bis der Ventilsitz 13 am Ventilkegel 15 dichtend zur Anlage kommt. Der Metallbalg 12 besitzt Federeigenschaften und wurde so ausgelegt, daß die sonst übliche Sollwertfeder zur Bestimmung des Ansprechdruckes entfallen kann. Beim Überschreiten des voreingestellten Druckes in der Eingangskammer 19 öffnet der Rückflußverhinderer 2 und füllt eine Zwischenkammer 20. Nach geringfügigem Druckanstieg in der Zwischenkammer 20 öffnet der ausgangsseitige Rückflußverhinderer 3 und das Wasser fließt durch eine Ausgangskammer 21 zu einem Verbraucher. Das Gehäuse 1 wird dabei nicht mit Druck beaufschlagt; es dient lediglich als Aufnahme für das Ablaßventil 4 mit dem Rückflußverhinderer 2 und dem Gehäuse 14 mit dem ausgangsseitigen Rückflußverhinderer 3und zur Abstandshaltung zwischen dem Ablaßventil 4 und dem Ventilkegel 15. Darüber hinaus bietet das Gehäuse beim Öffnen des Ablaßventils 4 z.B. bei Druckabfall auf der Eingangsseite einen wirksamen Spritzschutz und ermöglicht am Rohrstutzen 5 den Anschluß einer Abwasserleitung. The function of the system separator is described with reference to FIG. 1. The water arrives through an input chamber 19 into the system separator. When pressure builds up in the Inlet chamber 19 remains the inlet-side backflow preventer 2 up to one predetermined pressure closed. The metal bellows 12 expands and moves it Drain valve 4 until the valve seat 13 comes to bear sealingly on the valve cone 15. The Metallbalg 12 has spring properties and was designed so that the usual Setpoint spring for determining the response pressure can be omitted. When exceeding the preset pressure in the input chamber 19 opens the backflow preventer 2 and fills an intermediate chamber 20. After a slight increase in pressure in the intermediate chamber 20 opens the outlet-side backflow preventer 3 and the water flows through one Exit chamber 21 to a consumer. The housing 1 is not under pressure acted upon; it only serves as a receptacle for the drain valve 4 with the backflow preventer 2 and the housing 14 with the outlet-side backflow preventer 3 and Distance between the drain valve 4 and the valve plug 15. In addition offers the housing when opening the drain valve 4 e.g. when pressure drops on the Effective splash protection on the input side and enables 5 on the pipe socket Connection of a sewage pipe.

Anhand der Figuren 1 bis 4 soll der Austausch der Baugruppe 22, bestehend aus den Rückflußverhinderern 2, 3 und dem Ablaßventil 4, beschrieben werden. Der Systemtrenner wird über den Eingangsanschluß 7 und den Ausgangsanschluß 8 in eine Trinkwasserleitung eingebaut. Nicht dargestellt sind Absperrventile, die vor und nach dem Systemtrenner eingebaut sind und die geschlossen werden, wenn Wartungsarbeiten, z.B. ein Austausch der Funktionselemente 2, 3, 4, 14 vorgenommen werden müssen. Die Zuganker 6' wreden ausgebaut, während die Zuganker 6 eingebaut bleiben und den Eingangsanschluß 7 und den Ausgangsanschluß 8 fest miteinander verbinden. Die Zuganker 6 sind geringfügig länger als die Gesamtlänge der Baugruppe 22, so daß die Baugruppe 22 spannungsfrei zwischen den Anschlüssen 7 und 8 ausgewechselt werden kann. Die Zuganker 6 zentrieren dabei die Baugruppe 22 am Umfang des Gehäuses 1. Die stirnseitigen O-Ringe 9, 10 dichten zwischen der Baugruppe 22 und den Anschlußflanschen 7, 8 zur Atmosphäre hin ab und der zwischen den Zugankern 6 liegende Rohrstutzen 5 sichert die Baugruppe 22 gegen Verdrehen.Based on Figures 1 to 4, the replacement of the assembly 22 consisting of the Backflow preventer 2, 3 and the drain valve 4 are described. The system separator is via the input port 7 and the output port 8 in a drinking water line built-in. Shut-off valves before and after the system separator are not shown installed and which are closed when maintenance work, e.g. an exchange of Functional elements 2, 3, 4, 14 must be made. The tie rods 6 'would removed while the tie rods 6 remain installed and the input port 7 and Firmly connect the output connection 8 to one another. The tie rods 6 are slightly longer than the total length of the assembly 22, so that the assembly 22 is stress-free between the Ports 7 and 8 can be replaced. The tie rods 6 center the Assembly 22 on the circumference of the housing 1. Seal the front O-rings 9, 10 between the assembly 22 and the connecting flanges 7, 8 to the atmosphere and the between the tie rods 6 lying pipe socket 5 secures the assembly 22 against Twisting.

Claims (6)

Systemtrenner, bestehend aus zwei in Durchflußrichtung eines Mediums hintereinander geschalteten Rückflußverhinderern (2,3) und einem eine Zwischenkammer (20) zwischen den beiden Rückflußverhinderern in die Atmosphäre entlüftenden Ablaßventil (4,15), welches von der Druckdifferenz des Eingangsdruckes und des Zwischenkammerdruckes gesteuert wird, wobei die Rückflußverhinderer (2,3) und das Ablaßventil (4,15) auf einer gemeinsamen Achse angeordnet und in eine Rohrleitung eingebaut sind, durch gekennzeichnet, daß die Rückflußverhinderer (2,3) und das Ablaßventil (4,15) in einem Gehäuse (1) zu einer Baugruppe (22) zusammengefaßt sind und mittels Zuganker (6,6') so zwischen Anschlußflansche (7,8) der Rohrleitung eingebaut sind, daß nach dem Entfernen mindestens eines Zugankers (6') die Baugruppe (22), ohne die Verbindung mit der Rohrleitung zu lösen, ausgetauscht werden kann.System separator, consisting of two non-return valves (2, 3) connected in series in the direction of flow of a medium and a drain valve (4, 15) venting an intermediate chamber (20) between the two non-return valves, which is controlled by the pressure difference between the inlet pressure and the intermediate chamber pressure , wherein the backflow preventer (2,3) and the drain valve (4,15) are arranged on a common axis and installed in a pipeline, characterized in that the backflow preventer (2,3) and the drain valve (4,15) in one Housings (1) are combined to form an assembly (22) and are installed between tie flanges (7,8) of the pipeline by means of tie rods (6,6 ') in such a way that after removing at least one tie rod (6') the assembly (22) without loosening the connection to the pipeline. Systemtrenner nach Anspruch 1, dadurch gekennzeichnet, daß die Zuganker (6,6') den Abstand zwischen dem Eingangsflansch (7) und dem Ausgangsflansch (8) bestimmen und die Länge der Zuganker (6,6') geringfügig länger ist als die Gesamtbaulänge der Baugruppe (22).System separator according to claim 1, characterized in that the tie rods (6,6 ') determine the distance between the inlet flange (7) and the outlet flange (8) and the length of the tie rods (6,6') is slightly longer than the overall length of the Assembly (22). Systemtrenner nach Anspruch 1 und 2, dadurch gekennzeichnet, daß beim Austausch der Baugruppe (22) mindestens zwei Zuganker eingebaut bleiben, die zur Zentrierung der Baugruppe (22) und zur Fixierung der Einbaulänge dienen.System separator according to claim 1 and 2, characterized in that when the assembly (22) is replaced, at least two tie rods remain installed, which serve to center the assembly (22) and to fix the installation length. Systemtrenner nach Anspruch 3, dadurch gekennzeichnet, daß der Durchmesser eines die Zwischenkammer (20) entlüftenden Rohrstutzens (5) so gewählt ist, daß er mit geringem Spiel zwischen zwei Zugankern (6) die Baugruppe (22) gegen Verdrehen sichert.System separator according to claim 3, characterized in that the diameter of a pipe socket (5) venting the intermediate chamber (20) is selected such that it secures the assembly (22) against rotation with little play between two tie rods (6). Systemtrenner nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß ein Ventilsitz (4,13) des Ablaßventils (4,15) durch einen Metallbalg (12) verschiebbar gelagert ist. System separator according to claims 1 to 4, characterized in that a valve seat (4, 13) of the drain valve (4, 15) is slidably supported by a metal bellows (12). Systemtrenner nach Anspruch 5, dadurch gekennzeichnet, daß der Ventilsitz aus einer kopfseitig in einem Gehäuse (4) angeordneten ringförmigen Weichdichtung (13) besteht, die mit einem ortsfesten Ventilkegel (15) zusammenwirkt.System separator according to claim 5, characterized in that the valve seat consists of an annular soft seal (13) which is arranged at the head end in a housing (4) and which interacts with a stationary valve cone (15).
EP99123459A 1998-11-27 1999-11-25 Backflow preventer Withdrawn EP1004715A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19854951A DE19854951C2 (en) 1998-11-27 1998-11-27 System separator
DE19854951 1998-11-27

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EP1004715A1 true EP1004715A1 (en) 2000-05-31

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002059429A1 (en) * 2001-01-26 2002-08-01 Hans Sasserath & Co. Kg Pipe disconnector
EP1350896A3 (en) * 2002-04-03 2004-12-29 Hans Sasserath & Co Kg Valve arrangement for a back flow preventer
US7059340B2 (en) 2002-04-03 2006-06-13 Hans Sasserath & Co Kg Valve assembly for pipe disconnectors
DE202009013771U1 (en) 2009-10-02 2010-07-22 Hidde, Axel R., Dr. System or pipe separator in modular design as a cartridge
CN102147026A (en) * 2010-02-10 2011-08-10 天津市国威给排水设备制造有限公司 Micro backflow preventer
EP2617904A1 (en) * 2012-01-18 2013-07-24 Honeywell Technologies Sarl System disconnector
CN104315205A (en) * 2014-10-23 2015-01-28 天津市国威给排水设备制造有限公司 Leakproof backflow-preventing valve

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218121U1 (en) 2002-11-22 2003-03-27 Vollmer, Rudolf, 74821 Mosbach Backflow
DE10311251B3 (en) 2003-03-14 2005-01-05 Alfred Kärcher GmbH & Co KG Backflow preventer
DE10311252B3 (en) * 2003-03-14 2004-12-09 Alfred Kärcher GmbH & Co KG Backflow preventer
DE102004044850B3 (en) * 2004-09-10 2006-06-22 Alfred Kärcher Gmbh & Co. Kg backflow preventer
DE102005005452A1 (en) * 2005-02-04 2006-08-17 Honeywell Technologies S.A.R.L. Backflow
DE102006030973B3 (en) * 2005-07-04 2007-12-13 Hans Sasserath & Co. Kg Fluid system separator, has load spring causing spring force over lifting unit when inlet side stopper of spring is provided on exhaust valve body so that spring acts on lifting unit and serves as load spring for valve body
DE102005031422C5 (en) 2005-07-04 2012-09-27 Hans Sasserath & Co. Kg Backflow
DE102005049110B4 (en) * 2005-10-11 2007-05-31 Hans Sasserath & Co. Kg Sealing strength reinforced pipe separator
DE102005061694A1 (en) * 2005-12-21 2007-07-05 Honeywell Technologies S.A.R.L. System separator with drain valve and output side backflow preventer
DE102007006285A1 (en) * 2007-02-01 2008-08-07 Alfred Kärcher Gmbh & Co. Kg Back flow preventer for use with high-pressure cleaning device, has valve body adjustable in opening position by spring-elastic resetting force upon lack of pressurization, and leakage opening arranged between inlet and outlet openings
DE202007019441U1 (en) 2007-02-01 2012-08-09 Alfred Kärcher Gmbh & Co. Kg Backflow preventer
DE102007030654A1 (en) 2007-07-02 2009-01-08 Hans Sasserath & Co. Kg Pipe separator arrangement

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WO2002059429A1 (en) * 2001-01-26 2002-08-01 Hans Sasserath & Co. Kg Pipe disconnector
EP1350896A3 (en) * 2002-04-03 2004-12-29 Hans Sasserath & Co Kg Valve arrangement for a back flow preventer
US7059340B2 (en) 2002-04-03 2006-06-13 Hans Sasserath & Co Kg Valve assembly for pipe disconnectors
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
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CN102147026A (en) * 2010-02-10 2011-08-10 天津市国威给排水设备制造有限公司 Micro backflow preventer
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