EP0088861B1 - Back flow preventer, especially for water supply conduits - Google Patents

Back flow preventer, especially for water supply conduits Download PDF

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Publication number
EP0088861B1
EP0088861B1 EP83100098A EP83100098A EP0088861B1 EP 0088861 B1 EP0088861 B1 EP 0088861B1 EP 83100098 A EP83100098 A EP 83100098A EP 83100098 A EP83100098 A EP 83100098A EP 0088861 B1 EP0088861 B1 EP 0088861B1
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EP
European Patent Office
Prior art keywords
upstream
downstream
piston tube
chamber
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83100098A
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German (de)
French (fr)
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EP0088861A3 (en
EP0088861A2 (en
Inventor
Peter Hoffmann
Walter Evers
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Ecolab Engineering GmbH
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Lang Apparatebau GmbH
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Priority to AT83100098T priority Critical patent/ATE22584T1/en
Publication of EP0088861A2 publication Critical patent/EP0088861A2/en
Publication of EP0088861A3 publication Critical patent/EP0088861A3/en
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Publication of EP0088861B1 publication Critical patent/EP0088861B1/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
    • E03C1/104—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using a single check valve
    • 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 invention relates to a pipe separator, in particular for drinking water pipes, consisting of an inlet cylinder which can be connected to a shut-off water supply line, an outlet cylinder separated therefrom by a drainage point, a displaceably arranged in one of the two cylinders, acting under the action of a return spring, and an inlet side Valve body, which closes the piston tube in the disconnected position of the piston tube when the liquid supply is shut off under the action of the return spring, but at the end of the extension movement of the piston tube then sealingly entering the other cylinder when the fluid supply is released, releases the liquid passage through the latter.
  • the invention has for its object to provide a pipe separator of the type mentioned, in which it is ensured in a structurally simpler manner that the piston tube can retract into its guide cylinder when the liquid supply is shut off, that is to say it can get into its separating position without it being deliberate Leakage water passage on the circumference of the piston tube or a special drain valve is required.
  • This object is achieved in that a relief channel is provided in the valve body which connects the working spaces located on both sides of it.
  • the relief channel advantageously consists of a longitudinal bore provided in the valve rod end carrying the valve body and a radial radial hole.
  • the relief channel in the valve body also creates the prerequisite that the piston tube can be guided even better on its guide circumference in the feed cylinder and, above all, can also be sealed.
  • the piston tube has, at its end facing the inlet connection, an annular flange that extends comparatively far in the axial direction with two sliding rings at its ends and a sealing ring located between them, which bear against the cylinder wall in a sliding or sealing manner.
  • the guide between the cylinder wall and the piston tube ring flange can now be effectively sealed, which in turn is advantageous for the return spring, which thereby directly the piston tube can be arranged around without coming into contact with the flow water.
  • the slide rings on both sides of the seal on the piston tube ring flange ensure constant cleaning of the cylinder guide surface, which means that any limescale or similar deposits are constantly cleared.
  • the pipe separator shown has two cylinders with graduated diameters, namely the inlet cylinder 1 and the outlet cylinder 2, both of which are directly connected to one another via the screw flange connection 3.
  • the inlet cylinder 1 is closed on the inlet side by a cover 5 provided with a centrally arranged inlet connector 4.
  • a union nut 6 is seated on the inlet connection 4 for suitable connection to a pipeline provided with an upstream shut-off valve.
  • a corresponding union nut 7 is also located on the outlet connector 8 of the outlet cylinder 2.
  • Both the two cylinders 1, 2 and their connectors 4, 8 are coaxial with one another, so that there is an elongated, elongated design which does not require any pipeline offset for their installation.
  • the piston tube 9 is axially displaceably mounted.
  • the piston tube 9 is provided with a relatively far axially extending ring flange 10, at the ends of which there are sliding rings 11, 12 which bear against the inner wall of the cylinder 1 in a sliding manner.
  • a helical compression spring 14 serving as a return spring is provided, which is supported at one end on the piston tube ring flange 10 and at the other end on an annular disc 15 which rests on the projecting annular shoulder 16 of the feed cylinder 1.
  • the end 1 'of the feed cylinder 1 facing the discharge cylinder 2 is tapered in diameter and contains the leakage-water separating point in the form of the leakage water nozzle 17, to which the drain pipe 19 provided with a balloon-like extension 18 is connected.
  • a transparent window 20 is arranged opposite the leakage water nozzle 17, which enables a visual observation of the separation point.
  • a stop buffer ring 22 is provided on the annular shoulder 21, which projects into the tapered end 1 'of the feed cylinder 1, which limits the extension movement of the piston tube 9 by a stop on the annular flange 10.
  • valve rod 24 is fastened via radial retaining webs 23, which carries at its free end the valve body 25 which, with a circumferential seal 26 in the illustrated retracted separation position of the piston tube 9, bears sealingly against its inner wall.
  • a relief channel 27 is provided, which consists of the axial bore 27 'and the oblique radial bore 27 ".
  • the bore has a diameter of approximately 2 mm. It provides a permanent connection between the on both sides of the Valve body 25 located working spaces 28, 29.
  • the drain cylinder 2 which is twice the diameter, is provided at its inlet end with a grooved ring holder 30 which, on the one hand, encloses the seal 31, which cooperates with the piston tube 9, with the annular flange 16 of the inlet cylinder 1 and, on the other hand, with the projecting annular shoulder 2 'on the outlet cylinder 2, the valve seat ring 32.
  • This valve seat ring 32 belongs to the backflow preventer seated in the discharge cylinder 2, generally designated 33. This consists of the valve rod 35, which is in turn fastened via radial holding webs 34, and the valve body 36, which is axially displaceable to a limited extent against its spring action.
  • conical flow transition surfaces 37 or 38 and 39 are provided in the region of the holding webs 23 and 34 carrying the valve rods 24, 35 and at the inlet end of the piston tube 9.
  • the piston tube In the position shown in the drawing, the piston tube is in its separation position, which is retracted into the cylinder 1, in which the piston tube end 9 'is located at a sufficiently large safety distance from the drain cylinder 2 or the cylinder ring flange 16 facing it. Any process water that passes through the backflow preventer 33, which is closed in this position, runs off via the leakage water connection 17, and is therefore not able to get into the piston tube 9 and thus into the drinking water supply line. If the drinking water supply is released by opening a shut-off valve located in front of the pipe separator, the pressure in the working chamber 28 located in front of the valve body 25 is increased accordingly, although a small part of the inlet water already passes through the relief channel 27 and enters the leakage water nozzle 17 without damage expires.
  • the build-up of pressurized water is in any case strong enough to shift the piston tube 9 to the right into its flow position.
  • the piston tube 9 lifts off from the valve body 25, so that only then does the water flow through.
  • the backflow preventer 33 also opens.
  • the inflow water can thus flow well through the pipe separator with a comparatively low flow resistance. If the water flow is stopped at the shut-off valve on the inlet side, the water pressure drops.
  • the piston tube 9 is then moved into the disconnected position under the action of the return spring 14 surrounding it.

Landscapes

  • 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)
  • Safety Valves (AREA)
  • Pipe Accessories (AREA)

Abstract

A backflow-preventing valve for connection between a high-pressure input line and a lower-pressure output line has a valve housing forming upstream and downstream chambers and having an inlet opening into the upstream chamber remote from the downstream chamber, a vent opening into the upstream chamber offset from the inlet, and an outlet opening into the downstream chamber. A check valve in the downstream chamber allows flow only from the upstream chamber into the downstream chamber. A tubular piston sealingly engaged across the upstream chamber upstream of the vent, formed with a throughgoing bore, and having a downstream end engageable with the check valve is movable between an upstream position with its downstream end in the upstream chamber spaced from the check valve and a downstream position with its downstream end engaged sealingly with the check valve. Fluid flow through the bore from the inlet to the vent is only possible in and between the upstream position and an intermediate position of the piston. A spring urges the piston into the upstream position. A valve body fixed in the housing and sealingly engageable in the piston bore in and between the intermediate and upstream positions of the piston subdivides the upstream chamber into an upstream compartment into which the inlet opens and a downstream compartment into which the outlet and downstream chamber open. This valve body is spaced from the piston and permits free fluid exchange between the compartments between the downstream and intermediate positions of the piston and is formed with a small-diameter bleed passage opening at one side in the upstream compartment and at the other side in the downstream compartment.

Description

Die Erfindung bezieht sich auf einen Rohrtrenner, insbesondere für Trinkwasserleitungen, bestehend aus einem an eine absperrbare Wasserzuleitung anschließbaren Zulaufzylinder, einem davon durch eine leckwasserableitende Trennstelle getrennten Ablaufzylinder, einem in einem der beiden Zylinder verschieblich angeordneten, unter Wirkung einer Rückstellfeder stehenden Kolbenrohr und einem zulaufseitig angeordneten Ventilkörper, der in der bei abgesperrter Flüssigkeitszufuhr unter Wirkung der Rückstellfeder eingefahrenen Trennstellung des Kolbenrohres dieses verschließt, jedoch gegen Ende der bei freigegebener Flüssigkeitszufuhr entgegen der Rückstellfederkraft zustandekommenden Ausfahrbewegung des dann in den anderen Zylinder abdichtend einfahrenden Kolbenrohres den Flüssigkeitsdurchlaß durch letzteres freigibt.The invention relates to a pipe separator, in particular for drinking water pipes, consisting of an inlet cylinder which can be connected to a shut-off water supply line, an outlet cylinder separated therefrom by a drainage point, a displaceably arranged in one of the two cylinders, acting under the action of a return spring, and an inlet side Valve body, which closes the piston tube in the disconnected position of the piston tube when the liquid supply is shut off under the action of the return spring, but at the end of the extension movement of the piston tube then sealingly entering the other cylinder when the fluid supply is released, releases the liquid passage through the latter.

Bekannte Rohrtrenner obiger Art, z. B. nach der DE-B-2418035, gewährleisten in der eingefahrenen Trennstellung des Kolbenrohres, daß kein etwa verschmutztes Brauchwasser in die Trinkwasserzuleitung gelangen kann. Wird dagegen bei freigegebener Flüssigkeitszufuhr das dann vom Flüssigkeitsdruck beaufschlagte Kolbenrohr ausgefahren, so wird durch den Ventilkörper der Wasserdurchfluß durch das Kolbenrohr erst dann freigegeben, wenn letzteres sich in seiner die Trennstelle überbrückenden, also den Zulaufmit dem Ablaufzylinder ordnungsgemäß, d. h. leitungsdicht verbindenden Arbeits- bzw. Verbindungsstellung befindet. Dadurch werden Leck- und Spritzwasserverluste an der Trennstelle beim Aus- und Einfahren des Kolbenrohres weitestgehend verhindert. Solche Rohrtrenner werden überall dort eingesetzt, wo die Gefahr besteht, daß mit gesundheitsschädlichen Stoffen angereichertes oder sonstwie verunreinigtes Wasser durch Rücksog in das Speisewasser-Leitungsnetz gelangen kann.Known pipe separators of the above type, e.g. B. according to DE-B-2418035, ensure in the retracted disconnected position of the piston tube that no dirty service water can get into the drinking water supply line. If, on the other hand, when the liquid supply is released, the piston tube then acted upon by the liquid pressure is extended, so the water flow through the piston tube is only released by the valve body when the latter is bridging in its separating point, that is, the inlet with the discharge cylinder properly, i.e. H. working and connection position connecting in a line-tight manner. This largely prevents leakage and splash water losses at the separation point when the piston tube is extended and retracted. Such pipe separators are used wherever there is a risk that water enriched or otherwise contaminated with harmful substances can get back into the feed water supply network.

Damit das- unter Wirkung der Rückstellfeder stehende Kolbenrohr bei abgesperrter Flüssigkeitszufuhr in seine Trennstellung gelangen, also in den betreffenden Zylinder einfahren kann, ist bei dem bekannten Rohrtrenner nach der DE-B- 24 18 035 zwischen dem Kolbenrohr und der Zylinder-Innenwandung ein hinreichender Wasserdurchfluß oder aber, wie im Falle der DE-A-27 47 941, in dem zwischen dem Kolbenrohr und der Absperrstelle der Wasserzuleitung liegenden Rohrabschnitt ein besonderes Entleerungsventil notwendig, damit das darin eingeschlossene Wasser entweichen kann, andernfalls es die Einfahrbewegung des Kolbenrohres in den Zylinder blockieren würde, sobald das Kolbenrohr durch den Ventilkörper geschlossen wird. Solche Entleerungsventile sind aber nicht nur baulich aufwendig, sondern erfordern auch eine zusätzliche elektrische oder hydraulische Steuerung, die mit entsprechendem Aufwand verbunden ist. Der im ersteren Falle vorhandene Leckwasserdurchfluß zwischen Kolbenrohr und der Zylinderinnenwandung bedingt, daß die Rückstellfeder nicht unmittelbar um das Kolbenrohr herum, sondern an entfernterer Stelle angeordnet werden muß und nur indirekt über eine am Kolbenrohr vorhandene Brücke daran angreifen kann.So that the piston tube, which is under the action of the return spring, reaches its separation position when the liquid supply is shut off, that is to say it can move into the relevant cylinder, there is sufficient water flow between the piston tube and the inner wall of the cylinder in the known tube separator according to DE-B-24 18 035 or, as in the case of DE-A-27 47 941, in the pipe section lying between the piston tube and the shut-off point of the water supply line, a special drain valve is necessary so that the water enclosed therein can escape, otherwise it will block the entry movement of the piston tube into the cylinder would as soon as the piston tube is closed by the valve body. Such drain valves are not only structurally complex, but also require an additional electrical or hydraulic control, which is associated with corresponding effort. The leakage water flow between the piston tube and the inner wall of the cylinder in the former case means that the return spring does not have to be arranged directly around the piston tube, but at a more distant location and can only act indirectly on the piston tube via a bridge.

Der Erfindung liegt die Aufgabe zugrunde, einen Rohrtrenner der eingangs erwähnten Gattung zu schaffen, bei dem auf baulich einfachere Weise gewährleistet ist, daß das Kolbenrohr bei abgesperrter Flüssigkeitszufuhr in seinen Führungszylinder einfahren, also in seine Trennstellung gelangen kann, ohne daß es dazu also eines bewußten Leckwasserdurchlasses am Kolbenrohr-Führungsumfang oder eines besonderen Entleerungsventils bedarf. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im Ventilkörper ein die beidseitig von ihm gelegenen Arbeitsräume miteinander verbindender Entlastungskanal vorgesehen ist. Bei einem Rohrtrenner mit im Zulaufzylinder verschieblich geführtem Kolbenrohr und über eine Ventilstange fest angeordnetem Ventilkörper, der mit einer Umfangsdichtung versehen ist und in der Trennstellung des Kolbenrohres in dieses abdichtend hineinragt, besteht der Entlastungskanal vorteilhaft aus einer in dem den Ventilkörper tragenden Ventilstangenende vorgesehenen Längsbohrung und einer dazu schräg verlaufenden Radialbohrung.The invention has for its object to provide a pipe separator of the type mentioned, in which it is ensured in a structurally simpler manner that the piston tube can retract into its guide cylinder when the liquid supply is shut off, that is to say it can get into its separating position without it being deliberate Leakage water passage on the circumference of the piston tube or a special drain valve is required. This object is achieved in that a relief channel is provided in the valve body which connects the working spaces located on both sides of it. In the case of a pipe separator with a displaceably guided piston tube in the feed cylinder and a valve body fixedly arranged via a valve rod, which is provided with a circumferential seal and protrudes sealingly into the piston tube in the disconnected position, the relief channel advantageously consists of a longitudinal bore provided in the valve rod end carrying the valve body and a radial radial hole.

Überraschenderweise hat sich gezeigt, daß es bei entsprechender Bemessung des Entlastungskanals, insbesondere seiner Radialbohrung, zu einem nicht störenden Flüssigkeitsdurchtritt an dieser Stelle kommt. Dieser führt weder zum Auftreten von Spritzwasser noch zu nennenswerten Druckverlusten, so daß das Kolbenrohr jeweils ordnungsgemäß sowohl in seine ausgefahrene Durchflußstellung als auch in seine eingefahrene Trennstellung gelangen kann. Die beim Ausfahren des Kolbens durch die Entlastungsbohrung zustandekommende Flüssigkeitsdruckminderung ist so gering, daß dadurch das Ausfahren des Kolbenrohres nicht beeinträchtigt wird.Surprisingly, it has been shown that with appropriate dimensioning of the relief channel, in particular its radial bore, there is no disruptive passage of liquid at this point. This does not lead to the occurrence of splash water or any noteworthy pressure losses, so that the piston tube can properly move both into its extended flow position and into its retracted separation position. The liquid pressure reduction that occurs when the piston is extended through the relief bore is so small that it does not affect the extension of the piston tube.

Der Entlastungskanal im Ventilkörper schafft weiterhin die Voraussetzung, daß das Kolbenrohr an seinem Führungsumfang im Zulaufzylinder noch besser geführt und vor allem auch abgedichtet werden kann. Zu diesem Zweck besitzt das Kolbenrohr an seinem dem Zulaufstutzen zugewandten Ende einen sich in axialer Richtung vergleichsweise weit erstreckenden Ringflansch mit zwei an dessen Enden vorhandenen Gleitringen und einen dazwischen gelegenen Dichtring, die an der Zylinderwandung gleitbeweglich bzw. abdichtend anliegen. Dadurch kann die Führung zwischen Zylinderwandung und Kolbenrohr-Ringflansch nunmehr wirksam abgedichtet werden, was wiederum für die Rückstellfeder von Vorteil ist, die dadurch unmittelbar um das Kolbenrohr herum angeordnet werden kann, ohne mit dem Durchlaufwasser in Berührung zu kommen. Die beidseitig der am Kolbenrohr-ringflansch vorhandenen Dichtung gelegenen Gleitringe gewährleisten eine ständige Reinigung der Zylinder-Führungsfläche, die dadurch von etwaigen Kalk- od. dgl. Ablagerungen laufend geräumt wird.The relief channel in the valve body also creates the prerequisite that the piston tube can be guided even better on its guide circumference in the feed cylinder and, above all, can also be sealed. For this purpose, the piston tube has, at its end facing the inlet connection, an annular flange that extends comparatively far in the axial direction with two sliding rings at its ends and a sealing ring located between them, which bear against the cylinder wall in a sliding or sealing manner. As a result, the guide between the cylinder wall and the piston tube ring flange can now be effectively sealed, which in turn is advantageous for the return spring, which thereby directly the piston tube can be arranged around without coming into contact with the flow water. The slide rings on both sides of the seal on the piston tube ring flange ensure constant cleaning of the cylinder guide surface, which means that any limescale or similar deposits are constantly cleared.

In der Zeichnung ist ein vorteilhaftes Ausführungsbeispiel eines Rohrtrenners nach der Erfindung in senkrechtem Längsschnitt dargestellt.In the drawing, an advantageous embodiment of a pipe separator according to the invention is shown in a vertical longitudinal section.

Der abgebildete Rohrtrenner besitzt zwei im Durchmesser abgestufte Zylinder, nämlich den Zulaufzylinder 1 sowie den Ablaufzylinder 2, die beide über die Schrauben-Flanschverbindung 3 unmittelbar miteinander verbunden sind. Der Zulaufzylinder 1 ist zulaufseitig durch einen mit einem zentral angeordneten Zulaufstutzen 4 versehenen Deckel 5 verschlossen. Auf dem Zulaufstutzen 4 sitzt eine Überwurfmutter 6 zum geeigneten Anschluß an eine mit einem vorgeschalteten Absperrventil versehene Rohrleitung. Eine entsprechende Überwurfmutter 7 befindet sich auch auf dem Ablaufstutzen 8 des Ablaufzylinders 2. Sowohl die beiden Zylinder 1, 2 als auch ihre Stutzen 4, 8 liegen koaxial zueinander, so daß sich eine gestreckte längliche Bauart ergibt, die zu ihrem Einbau keinen Rohrleitungsversatz erfordert.The pipe separator shown has two cylinders with graduated diameters, namely the inlet cylinder 1 and the outlet cylinder 2, both of which are directly connected to one another via the screw flange connection 3. The inlet cylinder 1 is closed on the inlet side by a cover 5 provided with a centrally arranged inlet connector 4. A union nut 6 is seated on the inlet connection 4 for suitable connection to a pipeline provided with an upstream shut-off valve. A corresponding union nut 7 is also located on the outlet connector 8 of the outlet cylinder 2. Both the two cylinders 1, 2 and their connectors 4, 8 are coaxial with one another, so that there is an elongated, elongated design which does not require any pipeline offset for their installation.

Im Zulaufzylinder 1 ist das Kolbenrohr 9 axial verschieblich gelagert. Es ist zu diesem Zweck mit einem sich verhältnismäßig weit axial erstreckenden Ringflansch 10 versehen, an dessen Enden Gleitringe 11, 12 vorhanden sind, die an der Innenwandung des Zylinders 1 gleitbeweglich anliegen. Zwischen den beiden Gleitringen 11, 12 ist ein U-förmiger Dichtlippenring 13 vorhanden, der gut dichtend an der Zylinderwandung gleitverschieblich anliegt. Um das Kolbenrohr 9 ist eine als Rückstellfeder dienende Schraubendruckfeder 14 vorgesehen, die sich mit ihrem einen Ende am Kolbenrohr-Ringflansch 10 und mit ihrem anderen Ende an einer Ringscheibe 15 abstützt, die an der einspringenden Ringschulter 16 des Zulaufzylinders 1 aufliegt.In the feed cylinder 1, the piston tube 9 is axially displaceably mounted. For this purpose, it is provided with a relatively far axially extending ring flange 10, at the ends of which there are sliding rings 11, 12 which bear against the inner wall of the cylinder 1 in a sliding manner. Between the two sliding rings 11, 12 there is a U-shaped sealing lip ring 13, which rests on the cylinder wall in a sealing manner so that it can slide. Around the piston tube 9, a helical compression spring 14 serving as a return spring is provided, which is supported at one end on the piston tube ring flange 10 and at the other end on an annular disc 15 which rests on the projecting annular shoulder 16 of the feed cylinder 1.

Das dem Ablaufzylinder 2 zugewandte Ende 1' des Zulaufzylinders 1 ist im Durchmesser verjüngt gehalten und enthält die leckwasserableitende Trennstelle in Gestalt des Leckwasserstutzens 17, an den das mit einer ballonartigen Erweiterung 18 versehene Abflußrohr 19 angeschlossen ist. Gegenüber dem Leckwasserstutzen 17 ist ein Klarsichtfenster 20 angeordnet, das eine visuelle Beobachtung der Trennstelle ermöglicht. An der zu dem im Durchmesser verjüngten Ende 1' des Zulaufzylinders 1 einspringenden Ringschulter 21 ist ein Anschlagpufferring 22 vorgesehen, der durch Anschlag am Ringflansch 10 die Ausfahrbewegung des Kolbenrohres 9 begrenzt.The end 1 'of the feed cylinder 1 facing the discharge cylinder 2 is tapered in diameter and contains the leakage-water separating point in the form of the leakage water nozzle 17, to which the drain pipe 19 provided with a balloon-like extension 18 is connected. A transparent window 20 is arranged opposite the leakage water nozzle 17, which enables a visual observation of the separation point. A stop buffer ring 22 is provided on the annular shoulder 21, which projects into the tapered end 1 'of the feed cylinder 1, which limits the extension movement of the piston tube 9 by a stop on the annular flange 10.

Im Deckel 5 ist über radiale Haltestege 23 die Ventilstange 24 befestigt, die an ihrem freien Ende den Ventilkörper 25 trägt, der mit einer Umfangsdichtung 26 in der dargestellten eingefahrenen Trennstellung des Kolbenrohres 9 an dessen Innenwandung dichtend anliegt. An dem den Ventilkörper 25 tragenden Ventilstangenende ist ein Entlastungskanal 27 vorgesehen, der aus der Axialbohrung 27' und der schräg dazu verlaufenden Radialbohrung 27" besteht. Die Bohrung besitzt einen Durchmesser von ungefähr 2 mm. Sie stellt eine permanente Verbindung zwischen den zu beiden Seiten des Ventilkörpers 25 gelegenen Arbeitsräumen 28, 29 dar.In the cover 5, the valve rod 24 is fastened via radial retaining webs 23, which carries at its free end the valve body 25 which, with a circumferential seal 26 in the illustrated retracted separation position of the piston tube 9, bears sealingly against its inner wall. On the valve rod end carrying the valve body 25, a relief channel 27 is provided, which consists of the axial bore 27 'and the oblique radial bore 27 ". The bore has a diameter of approximately 2 mm. It provides a permanent connection between the on both sides of the Valve body 25 located working spaces 28, 29.

Der im Durchmesser zweifach abgesetzte Ablaufzylinder 2 ist an seinem Zulaufende mit einer Nutringhalterung 30 versehen, die einerseits mit dem Ringflansch 16 des Zulaufzylinders 1 die mit dem Kolbenrohr 9 zusammenwirkende Dichtung 31 und andererseits mit der einspringenden Ringschulter 2' am Ablaufzylinder 2 den Ventilsitzring 32 einschließt. Dieser Ventilsitzring 32 gehört zu dem im Ablaufzylinder 2 sitzenden, generell mit 33 bezeichneten Rückflußverhinderer. Dieser besteht aus der wiederum über radiale Haltestege 34 befestigten Ventilstange 35 und dem auf ihr entgegen Federwirkung begrenzt axial verschieblich sitzenden Ventilkörper 36.The drain cylinder 2, which is twice the diameter, is provided at its inlet end with a grooved ring holder 30 which, on the one hand, encloses the seal 31, which cooperates with the piston tube 9, with the annular flange 16 of the inlet cylinder 1 and, on the other hand, with the projecting annular shoulder 2 'on the outlet cylinder 2, the valve seat ring 32. This valve seat ring 32 belongs to the backflow preventer seated in the discharge cylinder 2, generally designated 33. This consists of the valve rod 35, which is in turn fastened via radial holding webs 34, and the valve body 36, which is axially displaceable to a limited extent against its spring action.

Um den Durchflußströmungswiderstand des Rohrtrenners so gering wie möglich zu halten, sind im Bereich der die Ventilstangen 24, 35 tragenden Haltestege 23 bzw. 34 sowie am Zulaufende des Kolbenrohres 9 konische Strömungsübergangsflächen 37 bzw. 38 und 39 vorgesehen.In order to keep the flow resistance of the pipe separator as low as possible, conical flow transition surfaces 37 or 38 and 39 are provided in the region of the holding webs 23 and 34 carrying the valve rods 24, 35 and at the inlet end of the piston tube 9.

In der in der Zeichnung dargestellten Lage befindet sich das Kolbenrohr in seiner in den Zylinder 1 eingefahrenen Trennstellung, in der das Kolbenrohrende 9' sich in hinreichend weitem Sicherheitsabstand vom -Ablaufzylinder 2 bzw. dem ihm zugewandten Zylinderringflansch 16 befindet. Etwaiges den in dieser Stellung geschlossenen Rückflußverhinderer 33 passierendes Brauchwasser läuft über den Leckwasserstutzen 17 ab, vermag also nicht in das Kolbenrohr 9 und damit etwa in die Trinkwasserzuleitung zu gelangen. Wird die Trinkwasserzufuhr durch Öffnen eines vor dem Rohrtrenner gelegenen Absperrventils freigegeben, so kommt es in dem vor dem Ventilkörper 25 gelegenen Arbeitsraum 28 zu entsprechendem Druckaufbau des Wassers, wenngleich dabei ein geringer Teil des Zulaufwassers auch bereits den Entlastungskanal 27 passiert und schadlos in den Leckwasserstutzen 17 abläuft. Der Druckwasseraufbau ist auf alle Fälle stark genug, um das Kolbenrohr 9 nach rechts in seine Durchflu- ßsteltung zu verschieben. Dabei fährt zunächst das Kolbenrohrende 9' in die Dichtung 31 bzw. die Halterung 30 ein. Danach hebt das Kolbenrohr 9 von dem Ventilkörper 25 ab, so daß es erst dann zum Wasserdurchfluß kommt. Zugleich öffnet dabei auch der Rückflußverhinderer 33. Das Zuflußwasser kann somit bei vergleichsweise geringem Strömungswiderstand den Rohrtrenner gut durchströmen. Wird der Wasserzufluß an dem zulaufseitig gelegenen Absperrventil unterbunden, so fällt der Wasserdruck. Das Kolbenrohr 9 wird dann unter Wirkung der es umgebenden Rückstellfeder 14 in die Trennstellung gefahren. Sobalt dabei das Kolbenrohr 9 über den Ventilkörper 25 bzw. dessen Dichtung 26 fährt, erfolgt der Wasserauslauf aus dem Arbeitsraum 28 nur noch über die Entlastungsbohrung 27', wodurch es zu einer entsprechenden Verlangsamung der Einfahrbewegung des Kolbenrohres 9 kommt, bis dieses schließlich in die dargestellte Trennstellung gelangt.In the position shown in the drawing, the piston tube is in its separation position, which is retracted into the cylinder 1, in which the piston tube end 9 'is located at a sufficiently large safety distance from the drain cylinder 2 or the cylinder ring flange 16 facing it. Any process water that passes through the backflow preventer 33, which is closed in this position, runs off via the leakage water connection 17, and is therefore not able to get into the piston tube 9 and thus into the drinking water supply line. If the drinking water supply is released by opening a shut-off valve located in front of the pipe separator, the pressure in the working chamber 28 located in front of the valve body 25 is increased accordingly, although a small part of the inlet water already passes through the relief channel 27 and enters the leakage water nozzle 17 without damage expires. The build-up of pressurized water is in any case strong enough to shift the piston tube 9 to the right into its flow position. First the piston tube end 9 ′ moves into the seal 31 or the holder 30. Then the piston tube 9 lifts off from the valve body 25, so that only then does the water flow through. At the same time, the backflow preventer 33 also opens. The inflow water can thus flow well through the pipe separator with a comparatively low flow resistance. If the water flow is stopped at the shut-off valve on the inlet side, the water pressure drops. The piston tube 9 is then moved into the disconnected position under the action of the return spring 14 surrounding it. As soon as the piston tube 9 moves over the valve body 25 or its seal 26, the water outlet from the working space 28 only takes place via the relief bore 27 ', which leads to a corresponding slowdown of the retracting movement of the piston tube 9 until it finally reaches the one shown Separating position.

Claims (3)

1. Pipeline tap, particularly for drinking water pipes, consisting of a supply cylinder (1) attachable to a closable water line,.a discharge cylinder (2) separated therefrom by a separating zone for discharging leakage water, a piston tube (9) movably arranged, under the action of a restoring spring, in one of the two cylinders (1, 2) and a valve member (25) arranged on the supply side, which closes the piston tube (9), in its separating position, with the liquid supply shut off, under the action of the restoring spring (14), while towards the end of the discharge movement of the piston tube (9), then sealingly located in the other cylinder, against the re-setting spring force, throughput of the fluid is released by the piston tube (9), characterised in that a discharge channel (27) connecting together operating chambers (28, 29) on both sides is provided in the valve body (25).
2. A tap according to claim 1, with a movably guided piston tube (9) in the supply cylinder (1) and a valve body (25) fixedly arranged by means of a valve stem (24), which is provided with a peripheral seal (26) and in the separating position of the piston tube (9) projects sealingly into this, characterised in that the discharge channel (27) consists of a longitudinal bore (27') provided in the valve stem end carrying the valve body (25) and a radial bore (27") located at an incline thereto.
3. Tap according to claim 2, characterised in that the piston tube (9), surrounded by the restoring spring (14) at its end facing the supply pipe (4), includes an annular flange (10) extending correspondingly in the axial direction, with two slide rings (11, 12) provided on its ends and a sealing ring (13) located therebetween, which contact the cylinder wall slidingly or sealingly respectively.
EP83100098A 1982-03-15 1983-01-07 Back flow preventer, especially for water supply conduits Expired EP0088861B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100098T ATE22584T1 (en) 1982-03-15 1983-01-07 PIPE SEPARATOR, ESPECIALLY FOR DRINKING WATER LINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8207222U 1982-03-15
DE19828207222U DE8207222U1 (en) 1982-03-15 1982-03-15 PIPE DISCONNECTOR, IN PARTICULAR FOR DRINKING WATER PIPES

Publications (3)

Publication Number Publication Date
EP0088861A2 EP0088861A2 (en) 1983-09-21
EP0088861A3 EP0088861A3 (en) 1985-05-15
EP0088861B1 true EP0088861B1 (en) 1986-10-01

Family

ID=6738028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100098A Expired EP0088861B1 (en) 1982-03-15 1983-01-07 Back flow preventer, especially for water supply conduits

Country Status (5)

Country Link
US (1) US4518006A (en)
EP (1) EP0088861B1 (en)
AT (1) ATE22584T1 (en)
CH (1) CH656663A5 (en)
DE (2) DE8207222U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2006222658B2 (en) * 2005-10-11 2011-03-17 Hans Sasserath & Co. Kg Pipe Disconnector with Increased Sealing Power

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3444300A1 (en) * 1984-12-05 1986-06-05 Lang Apparatebau GmbH, 8227 Siegsdorf PIPE DISCONNECTOR, IN PARTICULAR FOR DRINKING WATER PIPES
US4672991A (en) * 1986-04-01 1987-06-16 Badders Edwin T Back flow prevention valve
US5163465A (en) * 1991-09-20 1992-11-17 King Lloyd H Sr Vacuum breaker venting valve
US5425393A (en) * 1993-12-15 1995-06-20 Zurn Industries, Inc. Backflow prevention and detection system
JP3514684B2 (en) * 1999-12-22 2004-03-31 兼工業株式会社 Water hammer prevention device
US6675110B2 (en) 2002-01-15 2004-01-06 Watts Regulatoryco. Testing valve assemblies
PL359448A1 (en) * 2002-04-03 2003-10-06 Hans Sasserath & Co Kg Set of isolating valves for water supply system
US6910495B2 (en) * 2003-02-06 2005-06-28 Anthony P. Lafalce Backflow prevention system
US20050224114A1 (en) * 2004-04-07 2005-10-13 Christopher Michael Cook Breakaway pipe coupling with automatic shutoff
JP4559824B2 (en) * 2004-11-08 2010-10-13 株式会社豊田自動織機 Hydraulic circuit
WO2020097553A1 (en) 2018-11-09 2020-05-14 Flowserve Management Company Fluid exchange devices and related systems, and methods
WO2020097557A1 (en) 2018-11-09 2020-05-14 Flowserve Management Company Fluid exchange devices and related controls, systems, and methods
AU2019376162A1 (en) 2018-11-09 2021-05-27 Flowserve Pte. Ltd. Fluid exchange devices and related controls, systems, and methods
CN112996983A (en) 2018-11-09 2021-06-18 芙罗服务管理公司 Fluid exchange devices and related control devices, systems, and methods
US11286958B2 (en) 2018-11-09 2022-03-29 Flowserve Management Company Pistons for use in fluid exchange devices and related devices, systems, and methods
MX2021005196A (en) 2018-11-09 2021-07-15 Flowserve Man Co Methods and valves including flushing features.
AU2020401951A1 (en) 2019-12-12 2022-05-19 Flowserve Pte. Ltd. Fluid exchange devices and related controls, systems, and methods
US11746509B2 (en) * 2021-09-01 2023-09-05 Kenny Bassett Backflow prevention device

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953153A (en) * 1958-02-28 1960-09-20 Leslie C Gaul Vented safety check valve
US3067770A (en) * 1959-10-29 1962-12-11 Siegler Inc Two-way pressure responsive flow valve
US3083723A (en) * 1959-11-04 1963-04-02 Paul J Duchin Vacuum breaker
US3114382A (en) * 1962-04-30 1963-12-17 Elva J Karshner Backflow preventing valve
US3905382A (en) * 1973-09-28 1975-09-16 William Waterston Back flow preventor
AU465123B2 (en) * 1973-10-02 1975-09-03 Improvements in or relating to devices for preventing back flow in fluid supply systems
DE2418035C3 (en) * 1974-04-13 1978-09-21 Alfred Waletzko Apparatebau, 5820 Gevelsberg Pipe interrupter
US4013088A (en) * 1975-05-19 1977-03-22 Braukmann Armaturen Ag Valve structure
US4044787A (en) * 1976-03-19 1977-08-30 Rockwell International Corporation Backflow preventer and relief valve assembly
US4159025A (en) * 1977-05-06 1979-06-26 Telford L. Smith Back flow preventer valve
DE2747941C2 (en) * 1977-10-26 1985-02-14 Lang Apparatebau GmbH, 8227 Siegsdorf Device for protecting drinking water pipes against backflowing process water
US4232704A (en) * 1978-03-28 1980-11-11 Amtrol Inc. In line back flow preventer
FR2469630B1 (en) * 1979-11-12 1986-02-14 Frisquet Anc Ets M DISCONNECTOR FOR DRINKING WATER PIPING
DE3207964A1 (en) * 1981-04-16 1982-11-11 Gerson GmbH, 4400 Münster Backflow preventer for flowing media in conduits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2006222658B2 (en) * 2005-10-11 2011-03-17 Hans Sasserath & Co. Kg Pipe Disconnector with Increased Sealing Power

Also Published As

Publication number Publication date
EP0088861A3 (en) 1985-05-15
CH656663A5 (en) 1986-07-15
US4518006A (en) 1985-05-21
EP0088861A2 (en) 1983-09-21
DE3366493D1 (en) 1986-11-06
DE8207222U1 (en) 1982-08-05
ATE22584T1 (en) 1986-10-15

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