EP0420221B1 - Tube disconnector for aeration and de-aeration of a conduit - Google Patents

Tube disconnector for aeration and de-aeration of a conduit Download PDF

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Publication number
EP0420221B1
EP0420221B1 EP90118517A EP90118517A EP0420221B1 EP 0420221 B1 EP0420221 B1 EP 0420221B1 EP 90118517 A EP90118517 A EP 90118517A EP 90118517 A EP90118517 A EP 90118517A EP 0420221 B1 EP0420221 B1 EP 0420221B1
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EP
European Patent Office
Prior art keywords
pipe
medium
opening
line
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90118517A
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German (de)
French (fr)
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EP0420221A3 (en
EP0420221A2 (en
Inventor
Rudolf Winhard
Hermann Sperber
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.)
SCHUBERT & SALZER INGOLSTADT-ARMATUREN GMBH
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Schubert & Salzer Ingolstadt-Armaturen GmbH
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Classifications

    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02Plumbing installations for fresh water
    • E03C1/10Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/106Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03CDOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02Plumbing installations for fresh water
    • E03C1/10Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/108Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves having an aerating valve

Definitions

  • the invention relates to a pipe separator according to the preamble of claim 1.
  • a pipe separator is known from DE-U-89 05 206.
  • DE-C-33 90 421 and DE-A-35 09 720 pipe separators for separating and venting a pipe are also known. After each disconnection of a pipe separator, air enters the air as a result of the ventilation of the drain line. When the pipe separator is switched to the flow position, this air is trapped in the drain line and, when the medium is removed from the drain line, causes disturbances which are caused, for example, by the expansion of the emerging air.
  • pipe vents are installed in front of the tapping point.
  • a pipe breather arranged in the pipe in front of the extraction point has Especially in the case of pipe separators with a backflow preventer, the disadvantage is that air is sucked into the line through the pipe vent, especially when it is opened quickly at the extraction point. A satisfactory keeping of the drain line and the extraction point of air cannot be achieved with it.
  • the object of the invention is to design a pipe separator in such a way that the disadvantages of the prior art are avoided and in particular the air which has penetrated through the separating process is removed from the drain line of the pipe separator in a safe manner.
  • the backflow preventer ensures that the air which has entered through the separation process is first stowed at this, so that the air flows out through the vent opening before the backflow preventer is opened by the pressure which builds up. It is particularly advantageous if the backflow preventer only opens when a pressure of at least 0.2 bar has built up in the flow direction in front of the backflow preventer. The air is pressurized so that it passes the vent faster. The check valve only opens when the air has already left the drain line. The arrangement of the vent opening directly in front of the backflow preventer pushes the air out of the vent opening particularly reliably. The arrangement of the backflow preventer in the vicinity of the pipe separator means that only a small part of the drain line runs empty and therefore little Air enters the drain line.
  • a pipe vent on the vent opening automatically closes the vent when the air has left the drain line so that no medium can flow out.
  • a simple device ensures that no medium can flow out and that no further throttling of the outflowing air takes place initially after the vent opening.
  • the additional arrangement of a pipe breather on the chamber ensures that no back pressure against the inflowing air can build up in it.
  • the chamber is completely vented, so that no air is sucked back out of the chamber into the line even if there is a strong pressure drop on the discharge side. Unwanted wetting of the surroundings of the pipe separator with liquid is avoided by a device for absorbing splash water which can escape during the venting.
  • a line for discharging the spray water which can advantageously be connected to the spray water discharge line of the pipe separator, the spray water is reliably discharged.
  • a ventilation opening 5 is arranged in the drain line 3 of the pipe separator 1 between the ventilation opening 32 and the backflow preventer 4. This is connected via a connecting line 51 to a chamber 52 which is enclosed by the chamber wall 521.
  • the chamber 52 communicates with an automatic vent 6 through an opening 53.
  • the pipe separator has a drive unit 12 which, via a spring and a piston acted upon by the inflow-side medium pressure, controls the sealing elements 21 and 31 into the flow and ventilation positions.
  • the ventilation opening 32 is closed by the sealing element 31 and the sealing element 21 releases the inflow opening 22 of the outflow line 3.
  • the pipe separator according to the invention works in the transition from the ventilation position to the flow position as follows: After closing the ventilation opening 32 and opening the inflow opening 22, medium flows into the space 13. The trapped air is compressed and through the ventilation opening 5 from the outflow line 3 from the medium that is pushing in pushed out.
  • the backflow preventer which, for example, only releases the flow at an inflow-side pressure of 0.2 bar overpressure, it is achieved that the air first escapes from the vent opening 5 before the backflow preventer opens and releases the flow.
  • the non-return valve In contrast to non-return valves, which only prevent the medium from flowing back, the non-return valve requires the property of opposing an opening resistance to the inflowing medium, which is essential for the function of venting.
  • the property of preventing the medium from flowing back prevents the drain line from draining and thereby reduces the total amount of air that has penetrated into the drain line.
  • the vent opening is closed by a valve, which is, for example, manually operated, after the air outlet in order to prevent the escape of medium.
  • This version is conceivable, for example, for pipe separators with a large nominal diameter, where the separation process only occurs rarely and the transition to the flow position can therefore be monitored.
  • the vent opening 5 is connected to a chamber 52 via a connecting line 51.
  • the chamber 52 is not provided with a vent 6, as shown in Fig. 1, rather the size of the chamber 52 is together with a possible.
  • Existing connection line 51 selected so that the air which has penetrated into the space 13 as a result of the flow position is accommodated therein. The smallest is decisive, e.g. pressure occurring when removing medium, since this causes the largest volume. In order to achieve safe ventilation, the volume of the chamber 52 must be made larger by a safety volume.
  • the chamber 52 is connected to a pipe vent 6 via the opening 53.
  • the air to be pressed by the inflow of the medium through the vent opening 5 can escape through the vent opening 5 from the drain line 3 into the chamber 52 without a flow resistance, for example due to a pipe vent.
  • the air then exits through the pipe breather, as a result of which only a slight counterpressure can build up in the chamber 52, since the air constantly escapes from the chamber.
  • a splash guard 61 is attached, which collects the spray water emerging during the venting and directs it back into the chamber 52 when there is negative pressure or no pressure in the chamber, for example in the ventilation position of the pipe separator.
  • the escaped medium is drained off via the ventilation opening 32 of the pipe separator.
  • the splash guard 61 can also be connected to a line, not shown, which conducts the leaked medium (spray water) directly into the funnel 33 of the pipe separator 1, from where it is discharged as well as the medium escaping during the ventilation process.
  • the pipe separator 2 shows a pipe separator 1 with an automatic control valve 7, as described for example in DE-A-37 03 715, in the disconnected position.
  • the control valve 7 is connected via the connection 71 to the drain line 3, in the flow direction after the backflow preventer 4 and 4 ', also with the inflow line 2 via the line 72 and with the drive unit 12 via the control line 73.
  • the flow position is at this Only maintain the type of pipe separator if there is a lower medium pressure in the flow direction after the backflow preventer 4 than before the pipe separator.
  • the pipe separator of Fig. 2 has a divided drain line 3 'in which a second backflow preventer 4' is arranged.
  • the second backflow preventer 4 ' is used for the removal of small amounts of medium, which are removed via this drain line 3' formed as a bypass.
  • the arranged in the by-pass backflow preventer 4 ' can be designed so that it already opens at a back pressure that is lower than that of the backflow preventer 4. If the by-pass line has a high flow resistance, the air is already out of the Vent 5 escaped before the backflow preventer 4 'opens. The necessary back pressure from the backflow preventer 4 'is usually practically zero.
  • the invention is applicable not only for the shown embodiments of pipe separators, but also for pipe separators, which are controlled, for example, by means of electric solenoid valves or pipe separators with sealing elements which are designed as slides (DE-C-33 90 421) or as one-piece sealing elements.
  • the invention also extends to embodiments in which a plurality of drain lines are assigned to the pipe separator, at least one of which is equipped with a backflow preventer and a vent opening.

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)
  • Separating Particles In Gases By Inertia (AREA)
  • Check Valves (AREA)
  • External Artificial Organs (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Physical Water Treatments (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

In a tube disconnecter (1), having a supply line (2) and a discharge line (3), having a closure element for disconnecting supply line and discharge line, and an aeration opening for aerating the discharge line, and also having a device (4, 4') for preventing backflow of the medium in the discharge line (3), a de-aeration opening (5) is arranged in the discharge line (3) between the supply opening (22) of the tube disconnecter (1) and the device (4, 4') for preventing backflow of the medium, in order to de-aerate the air which has penetrated into the discharge line during the disconnection process. <IMAGE>

Description

Die Erfindung betrifft einen Rohrtrenner gemäß dem Oberbegriff des Ansprüches 1. Ein solcher Rohrtrenner ist aus der DE-U-89 05 206 bekannt. Aus der DE-C-33 90 421 und der DE-A-35 09 720 sind ebenfalls Rohrtrenner zum Abtrennen und Belüften einer Rohrleitung bekannt. Nach jedem Trennvorgang eines Rohrtrenners tritt infolge der Belüftung der Abflußleitung in diese Luft ein. Beim Umschalten des Rohrtrenners in die Durchflußstellung wird diese Luft in der Abflußleitung eingeschlossen und verursacht bei der Mediumentnahme aus der Abflußleitung Störungen, die beispielsweise durch die Expansion der austretenden Luft verursacht werden.The invention relates to a pipe separator according to the preamble of claim 1. Such a pipe separator is known from DE-U-89 05 206. From DE-C-33 90 421 and DE-A-35 09 720 pipe separators for separating and venting a pipe are also known. After each disconnection of a pipe separator, air enters the air as a result of the ventilation of the drain line. When the pipe separator is switched to the flow position, this air is trapped in the drain line and, when the medium is removed from the drain line, causes disturbances which are caused, for example, by the expansion of the emerging air.

Um die Luftmenge zu begrenzen, sind aus den oben zitierten Patenschriften Ausführungsformen von Rohrtrennern bekannt, bei denen hinter der Trennstelle ein Rückflußverhinderer angeordnet ist, so daß die Abflußleitung über die Belüftungsöffnung nicht völlig leer läuft und der belüftete Abschnitt und damit die in die Rohrleitung eingebrachte Luftmenge klein gehalten wird. Es verbleibt jedoch die bei der Belüftung in die Abflußleitung eingedrungene Luft in der Rohrleitung und wird durch das strömende Medium bis zur Entnahmestelle mitgerissen.In order to limit the amount of air, embodiments of pipe separators are known from the above-cited patents, in which a backflow preventer is arranged behind the separating point, so that the drain line via the ventilation opening does not run completely empty, and the ventilated section and thus the amount of air introduced into the pipe is kept small. However, the air that has penetrated into the drain line during ventilation remains in the pipeline and is entrained by the flowing medium to the extraction point.

Um die Luft aus der Leitung zu entfernen, werden in der Praxis Rohrentlüfter vor der Entnahmestelle installiert. Ein vor der Entnahmestelle in der Rohrleitung angeordneter Rohrentlüfter hat insbesondere bei Rohrtrennern mit einem Rückflußverhinderer den Nachteil, daß durch den Rohrentlüfter vor allem bei einem schnellen Öffnen an der Entnahmestelle Luft in die Leitung hineingesaugt wird. Ein zufriedenstellendes Freihalten der Abflußleitung und der Entnahmestelle von Luft kann damit nicht erreicht werden.In order to remove the air from the line, pipe vents are installed in front of the tapping point. A pipe breather arranged in the pipe in front of the extraction point has Especially in the case of pipe separators with a backflow preventer, the disadvantage is that air is sucked into the line through the pipe vent, especially when it is opened quickly at the extraction point. A satisfactory keeping of the drain line and the extraction point of air cannot be achieved with it.

Durch die DE-U-89 05 206 ist es bekannt, eine Belüftungsöffnung zwischen dem Verschlußelement zum Schließen der Zuflußleitung und einem Verschlußelement zum Abtrennen der Abflußleitung vorzusehen, bei weicher nicht auszuschließen ist, daß beim Wiedereinsetzen des Mediumdruckes und öffnen der Zuflußleitung zufällig auch etwas Luft aus dem belüfteten Rohrabschnitt entweichen könnte. Auf diese Weise kann jedoch keine zuverlässige und vollständige Entlüftung erreicht werden, zumal diese mit einem Belüftungsventil versehene Öffnung auf die Belüftung dieses Rohrabschnittes ausgelegt ist.From DE-U-89 05 206 it is known to provide a ventilation opening between the closure element for closing the inflow line and a closure element for separating the outflow line, for which it cannot be ruled out that when the medium pressure is re-inserted and the inflow line is opened, some air happens to be random could escape from the ventilated pipe section. In this way, however, no reliable and complete ventilation can be achieved, especially since this opening provided with a ventilation valve is designed for the ventilation of this pipe section.

Aufgabe der Erfindung ist es, einen Rohrtrenner so auszubilden, daß die Nachteile des Standes der Technik vermieden werden und insbesondere die durch den Trennvorgang eingedrungene Luft auf sichere Weise aus der Abflußleitung des Rohrtrenners wieder entfernt wird.The object of the invention is to design a pipe separator in such a way that the disadvantages of the prior art are avoided and in particular the air which has penetrated through the separating process is removed from the drain line of the pipe separator in a safe manner.

Die Aufgabe wird durch die Merkmale des Anspruches 1 gelöst.The object is achieved by the features of claim 1.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.Further advantageous embodiments of the invention are described in the subclaims.

Durch den Rückflußverhinderer wird erreicht, daß die über den Trennvorgang eingedrungene Luft zunächst an diesem gestaut wird, so daß die Luft durch die Entlüftungsöffnung ausströmt, bevor durch den sich aufbauenden Druck der Rückflußverhinderer geöffnet wird. Besonders vorteilhaft ist es, wenn der Rückflußverhinderer erst dann öffnet, wenn sich ein Druck von mindestens 0,2 bar in Durchflußrichtung vor dem Rückflußverhinderer aufgebaut hat. Die Luft wird unter Druck gesetzt, so daß sie schneller die Entlüftungsöffnung passiert. Per Rückflußverhinderer öffnet erst dann, wenn die Luft die Abflußleitung bereits verlassen hat. Durch die Anordnung der Entlüftungsöffnung unmittelbar vor dem Rückflußverhinderer wird die Luft besonders sicher aus der Entlüftungsöffnung hinausgedrückt. Die Anordnung des Rückflußverhinderers in Nähe des Rohrtrenners bedingt, daß nur ein geringer Teil der Abflußleitung leerläuft und dadurch wenig Luft in die Abflußleitung eindringt. Durch einen Rohrentlüfter auf der Entlüftungsöffnung wird ein automatisches Schließen der Entlüftungsöffnung erreicht, wenn die Luft die Abflußleitung verlassen hat, so daß kein Medium ausströmen kann. Durch eine sich an die Entlüftungsöffnung anschließende Kammer wird mit einer einfachen Vorrichtung erreicht, daß kein Medium ausströmen kann und daß zunächst nach der Entlüftungsöffnung keine weitere Drosselung der ausströmenden Luft erfolgt. Durch die zusätzliche Anordnung eines Rohrentlüfters auf der Kammer wird erreicht, daß sich in dieser kein Gegendruck gegen die einströmende Luft aufbauen kann. Die Kammer wird ganz entlüftet, und dadurch auch bei abflußseitigem starkem Druckabfall keine Luft aus der Kammer heraus in die Leitung zurücksaugt. Durch eine Vorrichtung zu Aufnahme von Spritzwasser, das bei der Entlüftung austreten kann, wird eine unerwünschte Benetzung der Umgebung der Rohrtrenners mit Flüssigkeit vermieden. Mit Verwendung einer Leitung zum Abführen des Spritzwassers, die vorteilhafterweise mit der Spritzwasserabführleitung des Rohrtrenners verbunden sein kann, wird eine sichere Abführung des Spritzwassers bewirkt.The backflow preventer ensures that the air which has entered through the separation process is first stowed at this, so that the air flows out through the vent opening before the backflow preventer is opened by the pressure which builds up. It is particularly advantageous if the backflow preventer only opens when a pressure of at least 0.2 bar has built up in the flow direction in front of the backflow preventer. The air is pressurized so that it passes the vent faster. The check valve only opens when the air has already left the drain line. The arrangement of the vent opening directly in front of the backflow preventer pushes the air out of the vent opening particularly reliably. The arrangement of the backflow preventer in the vicinity of the pipe separator means that only a small part of the drain line runs empty and therefore little Air enters the drain line. A pipe vent on the vent opening automatically closes the vent when the air has left the drain line so that no medium can flow out. By means of a chamber adjoining the vent opening, a simple device ensures that no medium can flow out and that no further throttling of the outflowing air takes place initially after the vent opening. The additional arrangement of a pipe breather on the chamber ensures that no back pressure against the inflowing air can build up in it. The chamber is completely vented, so that no air is sucked back out of the chamber into the line even if there is a strong pressure drop on the discharge side. Unwanted wetting of the surroundings of the pipe separator with liquid is avoided by a device for absorbing splash water which can escape during the venting. With the use of a line for discharging the spray water, which can advantageously be connected to the spray water discharge line of the pipe separator, the spray water is reliably discharged.

Im Folgenden wird die Erfindung anhand zeichnerischer Darstellungen näher erläutert. Es zeigen

Fig. 1
eine vorteilhaft ausgestaltete Ausführungsform der Erfindung mit einem durch den zuflußseitigen Mediumdruck gesteuerten Rohrtrenner,
Fig. 2
einen erfindungsgemäß ausgestalteten Rohrtrenner mit einer Steuereinrichtung.
The invention is explained in more detail below with the aid of drawings. Show it
Fig. 1
an advantageous embodiment of the invention with a pipe separator controlled by the inflow-side medium pressure,
Fig. 2
an inventive pipe separator with a control device.

Der Rohrtrenner der Fig. 1 besteht aus einem Gehäuse, einer Zuflußleitung 2, einer Abflußleitung 3, einem die Zuflußleitung 2 verschließenden Dichtelement 21 und einem die Belüftungsöffnung 32 verschließenden Dichtelement 31. Die Dichtelemente 21 und 31 sind über eine Stange 11 miteinander verbunden. In der Abflußleitung 3 ist ein Rückflußverhinderer 4 angeordnet. Zwischen der Belüftungsöffnung 32 und dem Rückflußverhinderer 4 ist in der Abflußleitung 3 des Rohrtrenners 1 eine Entlüftungsöffnung 5 angeordnet. Diese ist über eine Anschlußleitung 51 mit einer Kammer 52 verbunden, die durch die Kammerwand 521 umschlossen ist. Durch eine Öffnung 53 steht die Kammer 52 mit einem automatischen Entlüfter 6 in Verbindung. Zur Steuerung der Dichtelemente 21 und 31 besitzt der Rohrtrenner eine Antriebseinheit 12 die, über eine Feder und einen vom zuflußseitigen Mediumdruck beaufschlagten Kolben die Dichtelemente 21 und 31 in die Durchfluß- und die Belüftungsstellung steuert. In der Durchflußstellung wird die Belüftungsöffnung 32 vom Dichtelement 31 verschlossen und das Dichtelement 21 gibt die Zuflußöffnung 22 der Abflußleitung 3 frei.1 consists of a housing, an inflow line 2, an outflow line 3, a sealing element 21 closing the inflow line 2 and a sealing element 31 closing the ventilation opening 32. The sealing elements 21 and 31 are connected to one another via a rod 11. In the drain line 3, a backflow preventer 4 is arranged. A ventilation opening 5 is arranged in the drain line 3 of the pipe separator 1 between the ventilation opening 32 and the backflow preventer 4. This is connected via a connecting line 51 to a chamber 52 which is enclosed by the chamber wall 521. The chamber 52 communicates with an automatic vent 6 through an opening 53. To control the sealing elements 21 and 31, the pipe separator has a drive unit 12 which, via a spring and a piston acted upon by the inflow-side medium pressure, controls the sealing elements 21 and 31 into the flow and ventilation positions. In the throughflow position, the ventilation opening 32 is closed by the sealing element 31 and the sealing element 21 releases the inflow opening 22 of the outflow line 3.

Beim Übergang von der in Fig. 1 gezeigten Belüftungsstellung in die Durchflußstellung wird die Luft, die sich im Raum 13, der sich von der Zuflußöffnung 22 bis zum Rückflußverhinderer 4 erstreckt, befindet, eingeschlossen. Bei Fehlen einer erfindungsgemäßen Entlüftungsöffnung würde durch die infolge einer abflußseitigen Mediumentnahme verursachten Strömung die im Raum 13 eingeschlossene Luft über den Rückflußverhinderer hinweg in die Abflußleitung mitgerissen.During the transition from the ventilation position shown in FIG. 1 to the flow position, the air which is in the space 13, which extends from the inflow opening 22 to the backflow preventer 4, is enclosed. In the absence of a vent opening according to the invention, the flow caused by a discharge on the outflow side of the medium would trap the space 13 Air is entrained into the drain line via the backflow preventer.

Der erfindungsgemäße Rohrtrenner arbeitet beim Übergang von der Belüftungsstellung in die Durchflußstellung folgendermaßen: Nach dem Schließen der Belüftungsöffnung 32 und dem Öffnen der Zuflußöffnung 22 strömt Medium in den Raum 13. Die eingeschlossene Luft wird komprimiert und durch die Entlüftungsöffnung 5 aus der Abflußleitung 3 vom nachdrängenden Medium hinausgedrückt. Durch eine entsprechende Auslegung des Rückflußverhinderers, der z.B. erst bei einem zuflußseitigen Druck von 0,2 bar Überdruck den Durchfluß freigibt, wird erreicht, daß die Luft zuerst aus der Entlüftungsöffnung 5 entweicht bevor der Rückflußverhinderer öffnet und den Durchfluß freigibt. Der Rückflußverhinderer benötigt im Gegensatz zu Rückflußverhinderern, die lediglich ein Rückfließen des Mediums verhindern, die Eigenschaft dem zufließenden Medium einen Öffnungswiderstand entgegenzusetzen, die wesentlich für die Funktion des Entlüftens ist. Die Eigenschaft, das Zurückfließen des Mediums zu Verhindern, verhindert das Leerlaufen der Abflußleitung und vermindert dadurch die insgesamt in der Abflußleitung eingedrungene Luftmenge. In einer einfachen Ausführungsform kann vorgesehen sein, daß die Entlüftungsöffnung durch ein Ventil, das beispielsweise handbetätigt ist, nach dem Luftaustritt verschlossen wird, um den Austritt von Medium zu verhindern. Diese Ausführung ist beispielsweise bei Rohrtrennern mit großer Nennweite denkbar, bei denen der Trennvorgang nur selten eintritt und der Übergang in die Durchflußstellung daher überwacht werden kann.The pipe separator according to the invention works in the transition from the ventilation position to the flow position as follows: After closing the ventilation opening 32 and opening the inflow opening 22, medium flows into the space 13. The trapped air is compressed and through the ventilation opening 5 from the outflow line 3 from the medium that is pushing in pushed out. By a corresponding design of the backflow preventer, which, for example, only releases the flow at an inflow-side pressure of 0.2 bar overpressure, it is achieved that the air first escapes from the vent opening 5 before the backflow preventer opens and releases the flow. In contrast to non-return valves, which only prevent the medium from flowing back, the non-return valve requires the property of opposing an opening resistance to the inflowing medium, which is essential for the function of venting. The property of preventing the medium from flowing back prevents the drain line from draining and thereby reduces the total amount of air that has penetrated into the drain line. In a simple embodiment it can be provided that the vent opening is closed by a valve, which is, for example, manually operated, after the air outlet in order to prevent the escape of medium. This version is conceivable, for example, for pipe separators with a large nominal diameter, where the separation process only occurs rarely and the transition to the flow position can therefore be monitored.

Bei der in Fig. 1 gezeigten Ausführungsform der Erfindung ist die Entlüftungsöffnung 5 über eine Anschlußleitung 51 mit einer Kammer 52 verbunden. Bei einer einfachen Ausführung ist die Kammer 52 nicht mit einem Entlüfter 6, wie in Fig. 1 dagestellt, versehen, vielmehr ist die Größe der Kammer 52 zusammen mit einer eventl. vorhandenen Anschlußleitung 51 so gewählt, daß die über den Trennvorgang in den Raum 13 eingedrungene, infolge Durchflußstellung komprimierte Luft, darin Platz findet. Entscheidend ist dabei der kleinste z.B. bei Mediumentnahme auftretende Druck, da dieser das größte Volumen bedingt. Um eine sichere Entlüftung zu erreichen, ist das Volumen der Kammer 52 um ein Sicherheitsvolumen größer auszubilden.In the embodiment of the invention shown in FIG. 1, the vent opening 5 is connected to a chamber 52 via a connecting line 51. In a simple embodiment, the chamber 52 is not provided with a vent 6, as shown in Fig. 1, rather the size of the chamber 52 is together with a possible. Existing connection line 51 selected so that the air which has penetrated into the space 13 as a result of the flow position is accommodated therein. The smallest is decisive, e.g. pressure occurring when removing medium, since this causes the largest volume. In order to achieve safe ventilation, the volume of the chamber 52 must be made larger by a safety volume.

In Fig. 2 ist die Kammer 52 über die Öffnung 53 an einen Rohrentlüfter 6 angeschlossen. Die durch das Zufließen des Mediums durch die Entlüftungsöffnung 5 zu drückende Luft kann ohne, beispielsweise durch einen Rohrentlüfter bedingten Strömungswiderstand, durch die Entlüftungsöffnung 5 aus der Abflußleitung 3 in die Kammer 52 entweichen. Durch den Rohrentlüfter tritt die Luft anschließend ins Freie, wodurch sich in der Kammer 52 nur ein geringer Gegendruck aufbauen kann, da die Luft aus der Kammer ständig entweicht.In FIG. 2, the chamber 52 is connected to a pipe vent 6 via the opening 53. The air to be pressed by the inflow of the medium through the vent opening 5 can escape through the vent opening 5 from the drain line 3 into the chamber 52 without a flow resistance, for example due to a pipe vent. The air then exits through the pipe breather, as a result of which only a slight counterpressure can build up in the chamber 52, since the air constantly escapes from the chamber.

Auf dem Rohrentlüfter 6 ist eine Spritzschutzhaube 61 angebracht, die das bei der Entlüftung austretende Spritzwasser auffängt und es bei Unterdruck bzw. Drucklosigkeit in der Kammer, z.B. in der Belüftungsstellung des Rohrtrenners, wieder in die Kammer 52 zurückleitet. Über die Belüftungsöffnung 32 des Rohrtrenners wird das ausgetretene Medium abgeleitet. Die Spritzschutzhaube 61 kann auch mit einer nicht gezeigten Leitung verbunden sein, die das ausgetretene Medium (Spritzwasser) direkt in den Trichter 33 des Rohrtrenners 1 leitet, von wo aus es ebenso wie das beim Belüftungsvorgang austretende Medium abgeleitet wird.On the pipe vent 6, a splash guard 61 is attached, which collects the spray water emerging during the venting and directs it back into the chamber 52 when there is negative pressure or no pressure in the chamber, for example in the ventilation position of the pipe separator. The escaped medium is drained off via the ventilation opening 32 of the pipe separator. The splash guard 61 can also be connected to a line, not shown, which conducts the leaked medium (spray water) directly into the funnel 33 of the pipe separator 1, from where it is discharged as well as the medium escaping during the ventilation process.

Fig.2 zeigt eine Rohrtrenner 1 mit einem automatischen Steuerventil 7, wie es beispielsweise in der DE-A-37 03 715 beschrieben ist, in Trennstellung. Das Steuerventil 7 steht über den Anschluß 71 mit der Abflußleitung 3, in Durchflußrichtung nach den Rückflußverhinderern 4 und 4′, in Verbindung, ebenso mit der Zuflußleitung 2 über die Leitung 72 und mit der Antriebseinheit 12 über die Steuerleitung 73. Die Durchflußstellung wird bei dieser Art von Rohrtrenner nur aufrechterhalten, wenn in Durchflußrichtung nach dem Rückflußverhinderer 4 ein kleinerer Mediumdruck herrscht als vor dem Rohrtrenner. Der Rohrtrenner von Fig. 2 besitzt eine geteilte Abflußleitung 3′ in der ein zweiter Rückflußverhinderer 4′ angeordnet ist. Der zweite Rückflußverhinderer 4′ dient für die Entnahme von geringen Mediummengen, die über diese als Bypass ausgebildete Abflußleitung 3′ entnommen werden.2 shows a pipe separator 1 with an automatic control valve 7, as described for example in DE-A-37 03 715, in the disconnected position. The control valve 7 is connected via the connection 71 to the drain line 3, in the flow direction after the backflow preventer 4 and 4 ', also with the inflow line 2 via the line 72 and with the drive unit 12 via the control line 73. The flow position is at this Only maintain the type of pipe separator if there is a lower medium pressure in the flow direction after the backflow preventer 4 than before the pipe separator. The pipe separator of Fig. 2 has a divided drain line 3 'in which a second backflow preventer 4' is arranged. The second backflow preventer 4 'is used for the removal of small amounts of medium, which are removed via this drain line 3' formed as a bypass.

Die im By-pass angeordnete Rückflußverhinderer 4′ kann so ausgebildet sein,daß er sich bereits bei einem Gegendruck öffnet, der geringer ist als der des Rückflußverhindere 4. Besitzt nämlich die By-pass Leitung einen hohen Strömungswiderstand, so ist die Luft bereits aus der Entlüftungsöffnung 5 entwichen, ehe der Rückflußverhinderer 4′ öffnet. Der notwendige vom Rückflußverhinderer 4′ aufzubringende Gegendruck ist in der Regel praktisch Null.The arranged in the by-pass backflow preventer 4 'can be designed so that it already opens at a back pressure that is lower than that of the backflow preventer 4. If the by-pass line has a high flow resistance, the air is already out of the Vent 5 escaped before the backflow preventer 4 'opens. The necessary back pressure from the backflow preventer 4 'is usually practically zero.

Die Erfindung ist nicht nur für die gezeigten Ausführungsformen von Rohrtrennern anwendbar, sondern auch für Rohrtrenner, deren Steuerung beispielsweise mittels elektrischer Magnetventile erfolgt oder Rohrtrenner mit Dichtelementen, die als Schieber (DE-C-33 90 421) oder als einteilige Dichtelemente ausgebildet sind. Ebenso erstreckt sich die Erfindung auf Ausführungsformen, bei denen dem Rohrtrenner mehrere Abflußleitungen zugeordnet sind von denen mindestens eine mit einem Rückflußverhinderer und einer Entlüftungsöffnung ausgestattet ist.The invention is applicable not only for the shown embodiments of pipe separators, but also for pipe separators, which are controlled, for example, by means of electric solenoid valves or pipe separators with sealing elements which are designed as slides (DE-C-33 90 421) or as one-piece sealing elements. The invention also extends to embodiments in which a plurality of drain lines are assigned to the pipe separator, at least one of which is equipped with a backflow preventer and a vent opening.

Claims (10)

  1. Pipe divider having an inflow line (2) and an outflow line (3) for a medium, having a closure element (21) for isolating the inflow line from the outflow line, having an aeration valve (31, 32) which is downstream of the closure element (21) in the direction of flow of the medium, for aerating the outflow line, and having apparatus (4, 4') which is downstream of the aeration valve and is arranged in the outflow line, for preventing the medium from flowing back into the outflow line, characterized in that a deaeration opening (5) which is separate from the aeration valve (31, 32) is arranged in the outflow line (3), between the inlet opening (22) of the outflow line, which is closable by the closure element (21), and the apparatus (4, 4') for preventing the medium from flowing back.
  2. Pipe divider according to Claim 1, characterized in that the back-flow prevention means (4, 4') is arranged in the vicinity of the pipe divider (1) in the outflow line (3).
  3. Pipe divider according to Claim 1 or 2, characterized in that the deaeration opening (5) is arranged, as seen in the direction of flow of the medium, directly in front of the back-flow prevention means (4, 4').
  4. Pipe divider according to one or more of Claims 1 to 3, characterized in that a pipe deaeration means (6) is attached to the deaeration opening (5).
  5. Pipe divider according to one or more of Claims 1 to 4, characterized in that a chamber (52) for receiving the air which has flowed out of the deaeration opening (5) is attached to the deaeration opening (5).
  6. Pipe divider according to Claim 5, characterized in that the volume of the chamber (52) corresponds at least to the volume of the air quantity which is placed under pressure by the medium and has been absorbed as a result of aeration of the outflow line (3).
  7. Pipe divider according to Claim 5 or 6, characterized in that the chamber (52) has an opening (53) to which a pipe deaeration means (6) is attached.
  8. Pipe divider according to one or more of Claims 1 to 7, characterized in that the back-flow prevention means (4, 4') only allows throughflow of the medium once the pressure of the medium on the inflow side is greater than atmospheric pressure.
  9. Pipe divider according to one or more of Claims 1 to 8, characterized in that the aeration opening has apparatus (61) for receiving the sprayed water which emerges during the deaeration procedure.
  10. Pipe divider according to Claim 9, characterized in that a line for removing the sprayed water is associated with the apparatus (61) for receiving the sprayed water.
EP90118517A 1989-09-28 1990-09-27 Tube disconnector for aeration and de-aeration of a conduit Expired - Lifetime EP0420221B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932402A DE3932402A1 (en) 1989-09-28 1989-09-28 PIPE DISCONNECTOR FOR VENTILATING AND VENTILATING A PIPELINE
DE3932402 1989-09-28

Publications (3)

Publication Number Publication Date
EP0420221A2 EP0420221A2 (en) 1991-04-03
EP0420221A3 EP0420221A3 (en) 1991-12-11
EP0420221B1 true EP0420221B1 (en) 1994-11-30

Family

ID=6390397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118517A Expired - Lifetime EP0420221B1 (en) 1989-09-28 1990-09-27 Tube disconnector for aeration and de-aeration of a conduit

Country Status (4)

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EP (1) EP0420221B1 (en)
AT (1) ATE114765T1 (en)
DD (1) DD298152A5 (en)
DE (2) DE3932402A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725966C (en) * 1937-09-21 1942-10-21 Eduard Baese Ventilation device for water pipes
DE3045661C2 (en) * 1980-12-04 1982-11-18 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Riser pipe ventilator
DE3390421D2 (en) * 1982-12-21 1985-02-21 Gruenbeck Josef Wasseraufb Pipe separator
DE3323324C3 (en) * 1983-06-29 1995-10-12 Schubert & Salzer Gmbh & Co In Method and device for controlling a pipe separator as a function of a pressure difference specified at a comparison point
DE3509720A1 (en) * 1985-03-18 1986-09-25 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt TUBE DISCONNECTOR
DE3703715A1 (en) * 1987-02-06 1988-08-18 Schubert & Salzer Maschinen CONTROL VALVE FOR A TUBE DISCONNECTOR CONTROLLABLE FROM A DRIVE CHAMBER
DE3728608A1 (en) * 1987-08-27 1989-03-09 Licentia Gmbh Liquid-channelling line with two shut-off members
DE8905206U1 (en) * 1989-04-25 1989-06-22 Pomplun, Geb. Sommerfeld, Ursula, 4709 Bergkamen, De

Also Published As

Publication number Publication date
EP0420221A3 (en) 1991-12-11
DD298152A5 (en) 1992-02-06
DE59007839D1 (en) 1995-01-12
ATE114765T1 (en) 1994-12-15
EP0420221A2 (en) 1991-04-03
DE3932402C2 (en) 1992-05-27
DE3932402A1 (en) 1991-04-11

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