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EP2930407B1 - Valve assembly - Google Patents

Valve assembly Download PDF

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Publication number
EP2930407B1
EP2930407B1 EP14001319.4A EP14001319A EP2930407B1 EP 2930407 B1 EP2930407 B1 EP 2930407B1 EP 14001319 A EP14001319 A EP 14001319A EP 2930407 B1 EP2930407 B1 EP 2930407B1
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EP
European Patent Office
Prior art keywords
valve
pressure
pressure region
region
low
Prior art date
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Active
Application number
EP14001319.4A
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German (de)
French (fr)
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EP2930407A1 (en
Inventor
André Dr. Biegner
Anton Wellenhofer
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Linde GmbH
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Linde GmbH
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Publication date
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Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP14001319.4A priority Critical patent/EP2930407B1/en
Publication of EP2930407A1 publication Critical patent/EP2930407A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/04—Feeding or distributing systems using pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/16—Safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2208/00—Safety aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines

Definitions

  • the invention relates to a valve arrangement for a pressurized with a fluid system for connecting a first pressure range with a second pressure range, in particular a low-pressure region with a high-pressure region.
  • Such a valve arrangement is, for example, in the EP 2 492 772 A2 shown.
  • a supply of the fluid often takes place over a low pressure area, i. a part of the installation designed for low pressure sufficient for the supply or storage tank and / or tank.
  • a high pressure area i. however, a part of the system designed to be pressurized with the fluid under high pressure is used as the process side.
  • Low-pressure and high-pressure areas are often referred to as low-pressure and high-pressure sides, since they have two sides of a system designed for different pressures, i. Piping, apparatus and other equipment.
  • a safety valve is used to prevent unacceptable pressure exceeding, as also below with reference to FIG. 1 described.
  • contamination of the low pressure area with undesirable substances can not be prevented here as well.
  • the present invention therefore has the object to provide an effective shut-off device for connecting a low-pressure region with a high-pressure region in a fluid-loaded system.
  • valve arrangement for a system acted upon by a fluid for connecting a first pressure region to a second pressure region having the features of patent claim 1.
  • a valve arrangement according to the invention is used for a fluid-loaded system for connecting a first pressure range to a second pressure range.
  • the connection takes place by means of a first valve and a second valve connected in series.
  • the first pressure region comprises a low-pressure region, ie a plant part which is designed for low pressure and / or operated at low pressure
  • the second pressure region a high-pressure region, ie a plant part which is designed for high pressure and / or operated at high pressure can be.
  • a third valve connects a region between the first and the second valve to a third pressure region, in which the pressure, in particular the operating pressure, in particular is lower than in the first pressure range, for example, it is an open output to a torch, ie there is usually atmospheric pressure.
  • the first valve is arranged to close when a pressure applied to the side of the second pressure range is at least as high as a pressure applied to the side of the first pressure range.
  • the first valve is controlled by its own medium.
  • the first valve is coupled to the second valve such that the second valve closes when the first valve closes, and the second valve is coupled to the third valve such that the third valve opens when the second valve closes.
  • the connection between the first and the second pressure region is closed or shut off by the first and the second valve.
  • Fluid which remains in the area between the first and second valve, can flow off via the third valve, so there is a vent. Since there is a lower pressure in the region between the first and second valve than in the first pressure region, there can be no backflow of fluid into the first pressure region.
  • the process of shut-off and bleeding is done completely automatically by the valve assembly. Even if now the first and second valves are not completely sealed, no fluid flows from the second pressure range in the first pressure range, since the fluid instead flows through the third valve in the third pressure range. Exceeding the pressure in the first pressure range, ie in particular the low-pressure region, is thus effectively prevented. Likewise, there can be no contamination with undesirable substances there. In the case of a liquid metering, there is also no backflow of gas into the liquid-filled system in the low-pressure region.
  • the first valve via a switching device, in particular a valve or solenoid valve is coupled to the second valve.
  • a switching device in particular a valve or solenoid valve is coupled to the second valve.
  • the first valve with the switching device is mechanically, pneumatically or hydraulically coupled.
  • an optimal coupling can be selected, which ensures a fast operative connection.
  • the second valve with the switching device is electrically, hydraulically or pneumatically coupled.
  • an optimal coupling can be selected, which ensures a fast operative connection.
  • the coupling between the first valve and the switching device and the second valve and switching device may be of the same type.
  • a pneumatic coupling of the switching device and the second valve can be selected.
  • the second valve with the third valve mechansich, electrically, hydraulically or pneumatically coupled.
  • an optimal and most efficient coupling in particular also depending on the coupling of the second valve with the switching device, can be selected.
  • the third valve for example, does not require its own valve drive, but can be moved along via the valve drive of the second valve.
  • the third valve is coupled to the second valve indirectly via the switching device. This is quite effective, for example, in electrical coupling and an electrical switching device.
  • the first valve is arranged closer to the first pressure region than the second valve.
  • the low-pressure region is protected with a self-medium controlled valve. Since the first valve in the case of excessive pressure on the side of the second, ie in particular the high-pressure region, closes or shuts off first, the most effective way to prevent contamination with undesirable substances from the high-pressure region.
  • a pressure in the third pressure range is lower than in the second pressure range, the third pressure range in particular having a connection to a disposal system, a flare and / or atmosphere. This is ensures that fluid that flows in the case of a leaking second valve from the second pressure range in the area between the first and second valve is discharged immediately via the third valve, in particular to the atmosphere and / or flaring or disposal. The fluid can thus not flow through a possibly leaking first valve in the first pressure range.
  • the third valve also acts as a vent valve.
  • the invention also relates to a use of the illustrated valve arrangement according to the invention for preventing an undesired backflow from a high-pressure region into a low-pressure region, in particular in the event of a malfunction.
  • a use of the illustrated valve arrangement according to the invention for preventing an undesired backflow from a high-pressure region into a low-pressure region, in particular in the event of a malfunction.
  • FIG. 1 schematically shown a system 100 for a liquid metering.
  • a refillable tank 110 serves as a supply for a liquid present as a liquid.
  • the liquid is passed to a pump 120, by means of which a corresponding pressure can be built up to forward the liquid to a distributor 160.
  • a check valve 130 and another metering and / or shut-off valve 150 are arranged.
  • the check valve separates the system 100 into a low-pressure region with the tank 110 and a high-pressure region with the distributor 160, via which the fluid is introduced in gaseous form into a process circuit.
  • high-pressure side or high-pressure region a part of the system 100 is designated, which is designed for high pressures. In normal operation, however, there is a slightly higher pressure on the low-pressure side or in the low-pressure region than on the high-pressure side, or at least part of the high-pressure side, since otherwise no transport of the fluid in the direction of the high-pressure side would be possible.
  • a branch is provided between the pump 120 and the check valve 130 in the low-pressure region, which leads via a shut-off valve 170 to a safety valve 140.
  • a safety valve 140 opens automatically with appropriate overpressure, the height the overpressure at which the safety valve 140 opens, can be adjusted and / or adjusted as a rule.
  • FIG. 2 schematically a valve assembly 200 according to the invention is shown in a preferred embodiment.
  • the valve arrangement 200 serves to connect a first pressure region p1 designed as a low-pressure region to a second pressure region p2 in the form of a high-pressure region in a fluid-pressurized system. Since the valve arrangement 200 connects two sides with different pressure ranges, the low-pressure region p1 is also referred to as the low-pressure side and the high-pressure region p2 is also referred to as the high-pressure side. It should be noted that usually referred to as high pressure side of a part of the system, which is designed for high pressures. In normal operation, however, there is a slightly higher pressure on the low-pressure side than on the high-pressure side, or at least part of the high-pressure side, since otherwise no transport of the fluid in the direction of the high-pressure side would be possible
  • the connection is made via a first valve 10 and a second valve 20 connected in series therewith.
  • a region p1 / 2 is formed between the first valve 10 and the second valve 20.
  • the first valve 10 is designed as a self-medium-controlled valve. It closes automatically as soon as the pressure which prevails in the high-pressure region p2, in this case also and in particular in the region p1 / 2, is at least as high as the pressure which prevails in the low-pressure region p1.
  • the first valve 10 is coupled to a switching device 40 designed as a solenoid valve.
  • This coupling can be, for example, electrical. In the case of a differently designed switching device 40, however, a different type of coupling may be more appropriate.
  • the solenoid valve 40 in turn is coupled to the second valve 20. This coupling is designed here such that the solenoid valve 40 open a connection of the second valve 20 with a compressed air reservoir 80 and can close. A valve drive of the second valve 20 is thus here by means of compressed air, ie operated pneumatically.
  • the second valve 20 can be closed by the solenoid valve 40 opens or disconnects the connection to the compressed air reservoir.
  • the area p1 / 2 has a branch to a third valve 30 which connects the area p1 / 2 with a third pressure area p3.
  • the third pressure range p3 has, for example, a connection to a flare system and thus approximately atmospheric pressure.
  • the third valve 30 is now coupled to the second valve 20 such that it is automatically opened as soon as the second valve 20 is closed.
  • This coupling can be done, for example, mechanically.
  • the third valve 30 does not require its own valve drive, but is controlled by the valve drive of the second valve 20, which in turn is operated by means of compressed air.
  • FIG. 3 schematically a valve arrangement 300 according to the invention is shown in a further preferred embodiment.
  • the valve arrangement 300 differs from the one in FIG. 2 shown valve assembly 200 only in that the second valve 20 is not directly coupled to the third valve 30, but indirectly via a switching device 40.
  • the third valve 30 is coupled to the switching device 40, for example.
  • the second valve 20 and the third valve 30 are respectively, in particular simultaneously, controlled by the switching device 40, that is, the second valve 20 is closed and the third valve 30 is opened.
  • valve assemblies 200 and 300 are the same irrespective of the precise driving of the second valve 20 and the third valve 30. Therefore, in the following description of the operation, no distinction is made between the two valve arrangements.
  • the fluid flows from the low-pressure region p1 to the high-pressure region p2, where there is, for example, a process is supplied.
  • the first valve 10 and the second valve 20 are opened, the third valve 30 is closed.
  • the pressure in the region p1 / 2 is at least as high as in the low-pressure region p1
  • the first valve 10 closes automatically.
  • the first valve 10 already closes when the pressure equals between the range p1 / 2 and the low pressure range p1 or only at one certain overpressure in the range p1 / 2, wherein pressure equality is to be preferred in particular with regard to possible contamination of the low-pressure region p1.
  • the closing of the first valve 10 is accompanied by a closing of the second valve 20, as described above. This is therefore a double shut-off between the low-pressure region p1 and the high-pressure region p2.
  • the third valve 30 Since an opening of the third valve 30 is accompanied simultaneously with the closing of the second valve 20, it is ensured that the pressure in the low-pressure region p1 is always greater than the pressure in the region p1 / 2. Pressure which would build up by a possible leaking second valve 20 in the area p1 / 2 by overflowing fluid from the high pressure area p2, is degraded immediately via the third valve 30, since the fluid is discharged, for example. For flaring and / or to the atmosphere. The third valve 30 thus has the effect of a vent valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lift Valve (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Description

Die Erfindung betrifft eine Ventilanordnung für ein mit einem Fluid beaufschlagtes System zur Verbindung eines ersten Druckbereichs mit einem zweiten Druckbereich, insbesondere eines Niederdruckbereichs mit einem Hochdruckbereich.The invention relates to a valve arrangement for a pressurized with a fluid system for connecting a first pressure range with a second pressure range, in particular a low-pressure region with a high-pressure region.

Eine solche Ventilanordnung wird zum Beispiel in der EP 2 492 772 A2 gezeigt.Such a valve arrangement is, for example, in the EP 2 492 772 A2 shown.

Stand der TechnikState of the art

Bei Anlagen oder Systemen, die ein Fluid, d.h. Gas und/oder Flüssigkeit, führen, erfolgt eine Versorgung mit dem Fluid oft über einen Niederdruckbereich, d.h. einem Teil der Anlage, der für niedrigen Druck ausgelegt ist, der für die Versorgung bzw. einen Vorratsspeicher und/oder -tank ausreichend ist.In plants or systems which contain a fluid, i. Gas and / or liquid, a supply of the fluid often takes place over a low pressure area, i. a part of the installation designed for low pressure sufficient for the supply or storage tank and / or tank.

Ein Hochdruckbereich, d.h. ein Teil der Anlage, der für eine Beaufschlagung mit dem Fluid unter hohem Druck ausgelegt ist, wird hingegen als Prozessseite benutzt. Bei einer Einbindung von Anlagenteilen für Niederdruck in Systeme oder Teile davon für Hochdruck muss nun darauf geachtet werden, dass es bei eventuellen Betriebsstörungen zu keiner Rückströmung des Fluids vom Hochdruckbereich in den Niederdruckbereich kommt.A high pressure area, i. however, a part of the system designed to be pressurized with the fluid under high pressure is used as the process side. When integrating low-pressure system components into systems or parts thereof for high-pressure, care must be taken to ensure that no return flow of the fluid from the high-pressure range to the low-pressure range occurs in the event of malfunction.

Niederdruck- und Hochdruckbereich werden dabei oft auch als Niederdruck- und Hochdruckseite bezeichnet, da sie zwei für unterschiedliche Drücke ausgelegte Seiten einer Anlage, d.h. Rohrleitungen, Apparate und sonstige Ausrüstungsteile, darstellen.Low-pressure and high-pressure areas are often referred to as low-pressure and high-pressure sides, since they have two sides of a system designed for different pressures, i. Piping, apparatus and other equipment.

Eine solche Rückströmung hätte verschiedene Folgen wie bspw. eine Überschreitung eines zulässigen Drucks (eines Auslegungsdrucks) im Niederdruckbereich, eine Kontamination des Niederdruckbereichse mit Stoffen aus dem Hochdruckbereich oder im Falle einer Flüssigkeitsdosierung in Gassystemen die Rückströmung von Gas in das flüssigkeitsgefüllte System.Such backflow would have various consequences such as exceeding an allowable pressure (a design pressure) in the low pressure region, contamination of Niederdruckbereichese with substances from the high pressure area or in the case of a liquid metering in gas systems, the back flow of gas into the liquid-filled system.

Derartige Folgen, insbesondere die beiden erstgenannten, stellen ein Sicherheitsrisiko dar, das letztgenannte kann zumindest zu Betriebsstörungen wie bspw. dem Ausfall einer Pumpe führen.Such consequences, in particular the first two, represent a safety risk, the latter can lead at least to malfunction such as the failure of a pump.

Je nach Art oder Schwere der Folgen werden im Stand der Technik unterschiedliche Absicherungskonzepte verfolgt. Diesen ist gemeinsam, dass eine selbsttätige Rückschlagklappe verwendet wird. Solche haben jedoch üblicherweise den Nachteil, dass sie nicht vollständig dicht sind, wodurch sie weiterhin für das Fluid durchlässig sind. Insbesondere bei hohem Druck führt dies zu sogenannten Schleichströmungen vom Hochdruckbereich in den Niederdruckbereich.Depending on the nature or severity of the consequences, different hedging concepts are pursued in the prior art. These have in common that an automatic non-return valve is used. However, they usually have the disadvantage that they are not completely sealed, whereby they are still permeable to the fluid. Especially at high pressure, this leads to so-called creep flows from the high-pressure region into the low-pressure region.

Daher sind noch weitere Maßnahmen erforderlich, um die genannten Folgen zu verhindern oder zumindest zu mindern. Bei einer Flüssigkeitsdosierung wird bspw. ein Sicherheitsventil zur Verhinderung unzulässiger Drucküberschreitung benutzt, wie auch weiter unten unter Bezugnahme auf Figur 1 beschrieben. Jedoch kann auch hier eine Kontamination des Niederdruckbereichs mit unerwünschten Stoffen nicht verhindert werden.Therefore, further measures are needed to prevent or at least mitigate these consequences. In a liquid metering, for example, a safety valve is used to prevent unacceptable pressure exceeding, as also below with reference to FIG. 1 described. However, contamination of the low pressure area with undesirable substances can not be prevented here as well.

Die vorliegende Erfindung hat daher die Aufgabe, eine wirksame Absperrvorrichtung zur Verbindung eines Niederdruckbereichs mit einem Hochdruckbereich in einem mit Fluid beaufschlagten System bereitzustellen.The present invention therefore has the object to provide an effective shut-off device for connecting a low-pressure region with a high-pressure region in a fluid-loaded system.

Offenbarung der ErfindungDisclosure of the invention

Diese Aufgabe wird gelöst durch eine Ventilanordnung für ein mit einem Fluid beaufschlagtes System zur Verbindung eines ersten Druckbereichs mit einem zweiten Druckbereich mit den Merkmalen des Patentanspruchs 1.This object is achieved by a valve arrangement for a system acted upon by a fluid for connecting a first pressure region to a second pressure region having the features of patent claim 1.

Eine erfindungsgemäße Ventilanordnung wird für ein mit einem Fluid beaufschlagtes System zur Verbindung eines ersten Druckbereichs mit einem zweiten Druckbereich eingesetzt. Die Verbindung erfolgt dabei mittels eines ersten Ventils und eines dazu in Reihe geschalteten zweiten Ventils. Insbesondere umfasst dabei der erste Druckbereich einen Niederdruckbereich, d.h. einen Anlagenteil der für niedrigen Druck ausgelegt ist und/oder bei niedrigem Druck betrieben wird, und der zweite Druckbereich einen Hochdruckbereich, d.h. einen Anlagenteil der für hohen Druck ausgelegt ist und/oder bei hohem Druck betrieben werden kann. Ein drittes Ventil verbindet einen Bereich zwischen dem ersten und dem zweiten Ventil mit einem dritten Druckbereich, in welchem der Druck, insbesondere der Betriebsdruck, insbesondere niedriger ist als im ersten Druckbereich, bspw. handelt es sich dabei um einen offenen Ausgang zu einer Fackel, d.h. es herrscht in der Regel Atmosphärendruck. Das erste Ventil ist dazu eingerichtet, dass es schließt, wenn ein Druck, der auf Seite des zweiten Druckbereichs anliegt, mindestens so hoch ist wie ein Druck, der auf Seite des ersten Druckbereichs anliegt. Insbesondere ist das erste Ventil dazu Eigenmedium-gesteuert. Zudem ist das erste Ventil mit dem zweiten Ventil derart gekoppelt, dass das zweite Ventil schließt, wenn das erste Ventil schließt, und das zweite Ventil ist mit dem dritten Ventil derart gekoppelt, dass das dritte Ventil öffnet, wenn das zweite Ventil schließt.A valve arrangement according to the invention is used for a fluid-loaded system for connecting a first pressure range to a second pressure range. The connection takes place by means of a first valve and a second valve connected in series. In particular, the first pressure region comprises a low-pressure region, ie a plant part which is designed for low pressure and / or operated at low pressure, and the second pressure region a high-pressure region, ie a plant part which is designed for high pressure and / or operated at high pressure can be. A third valve connects a region between the first and the second valve to a third pressure region, in which the pressure, in particular the operating pressure, in particular is lower than in the first pressure range, for example, it is an open output to a torch, ie there is usually atmospheric pressure. The first valve is arranged to close when a pressure applied to the side of the second pressure range is at least as high as a pressure applied to the side of the first pressure range. In particular, the first valve is controlled by its own medium. In addition, the first valve is coupled to the second valve such that the second valve closes when the first valve closes, and the second valve is coupled to the third valve such that the third valve opens when the second valve closes.

Vorteile der ErfindungAdvantages of the invention

Erfindungsgemäß wird die Verbindung zwischen dem ersten und dem zweiten Druckbereich durch das erste und das zweite Ventil geschlossen bzw. abgesperrt. Fluid, welches dabei im Bereich zwischen dem ersten und zweiten Ventil verbleibt, kann über das dritte Ventil abfließen, es erfolgt also eine Entlüftung. Da im Bereich zwischen dem ersten und zweiten Ventil ein geringerer Druck als im ersten Druckbereich vorliegt, kann es zu keiner Rückströmung von Fluid in den ersten Druckbereich kommen. Der Vorgang des Absperrens und Entlüftens erfolgt vollständig selbsttätig durch die Ventilanordnung. Auch wenn nun das erste und zweite Ventil nicht vollständig dicht sind, fließt kein Fluid vom zweiten Druckbereich in den ersten Druckbereich, da das Fluid stattdessen über das dritte Ventil in den dritten Druckbereich abfließt. Eine Überschreitung des Drucks im ersten Druckbereich, also insbesondere dem Niederdruckbereich, wird somit wirksam verhindert. Ebenso kann dort keine Kontamination mit unerwünschten Stoffen erfolgen. Im Falle einer Flüssigkeitsdosierung erfolgt auch keine Rückströmung von Gas in das flüssigkeitsgefüllte System im Niederdruckbereich.According to the invention, the connection between the first and the second pressure region is closed or shut off by the first and the second valve. Fluid, which remains in the area between the first and second valve, can flow off via the third valve, so there is a vent. Since there is a lower pressure in the region between the first and second valve than in the first pressure region, there can be no backflow of fluid into the first pressure region. The process of shut-off and bleeding is done completely automatically by the valve assembly. Even if now the first and second valves are not completely sealed, no fluid flows from the second pressure range in the first pressure range, since the fluid instead flows through the third valve in the third pressure range. Exceeding the pressure in the first pressure range, ie in particular the low-pressure region, is thus effectively prevented. Likewise, there can be no contamination with undesirable substances there. In the case of a liquid metering, there is also no backflow of gas into the liquid-filled system in the low-pressure region.

Vorzugsweise ist das erste Ventil über eine Schaltvorrichtung, insbesondere ein Ventil oder Magnetventil mit dem zweiten Ventil gekoppelt. Dies ermöglicht eine besonders effektive Absperrung, da durch eine entsprechend ausgelegte Schaltvorrichtung das Schließen des zweiten Ventils besonders schnell erfolgen kann.Preferably, the first valve via a switching device, in particular a valve or solenoid valve is coupled to the second valve. This allows a particularly effective shut-off, as can be done very quickly by a correspondingly designed switching device, the closing of the second valve.

Vorteilhafterweise ist das erste Ventil mit der Schaltvorrichtung mechanisch, pneumatisch oder hydraulisch gekoppelt. Je nach Ausgestaltung der Ventilanordnung, insbesondere der räumlichen Ausgestaltung, und/oder der zur Verfügung stehenden Komponenten oder Ventilanschlüsse, kann somit eine optimale Kopplung gewählt werden, die eine schnelle Wirkverbindung gewährleistet.Advantageously, the first valve with the switching device is mechanically, pneumatically or hydraulically coupled. Depending on the configuration of the valve arrangement, in particular the spatial configuration, and / or the available Components or valve connections, thus an optimal coupling can be selected, which ensures a fast operative connection.

Es ist von Vorteil, wenn das zweite Ventil mit der Schaltvorrichtung elektrisch, hydraulisch oder pneumatisch gekoppelt ist. Auch hier kann je nach Ausgestaltung der Ventilanordnung, insbesondere der räumlichen Ausgestaltung, und/oder der zur Verfügung stehenden Komponenten oder Ventilanschlüsse, eine optimale Kopplung gewählt werden, die eine schnelle Wirkverbindung gewährleistet. Insbesondere kann die Kopplung zwischen erstem Ventil und Schaltvorrichtung und zweitem Ventil und Schaltvorrichtung von gleicher Art sein. Allerdings sind durchaus auch verschiedene Kopplungsarten denkbar, wenn dadurch bspw. Kosten- oder Effizienzvorteile erzielt werden können. Bei Verfügbarkeit eines Instrumenten-Luft-Anschlusses bspw. an einem Druckluftspeicher kann bspw. eine pneumatische Kopplung von Schaltvorrichtung und zweitem Ventil gewählt werden.It is advantageous if the second valve with the switching device is electrically, hydraulically or pneumatically coupled. Again, depending on the configuration of the valve assembly, in particular the spatial configuration, and / or the available components or valve connections, an optimal coupling can be selected, which ensures a fast operative connection. In particular, the coupling between the first valve and the switching device and the second valve and switching device may be of the same type. However, quite different types of coupling are also conceivable if, for example, cost or efficiency advantages can be achieved thereby. When an instrument-air connection is available, for example, at a compressed-air storage, for example, a pneumatic coupling of the switching device and the second valve can be selected.

Es ist weiter von Vorteil, wenn das zweite Ventil mit dem dritten Ventil mechansich, elektrisch, hydraulisch oder pneumatisch gekoppelt ist. Je nach Ausgestaltung kann so eine optimale und möglichst effiziente Kopplung, insbesondere auch in Abhängigkeit von der Kopplung des zweiten Ventils mit der Schaltvorrichtung, gewählt werden. Bei mechanischer Kopplung des zweiten mit dem dritten Ventil benötigt das dritte Ventil bspw. keinen eigenen Ventilantrieb, sondern kann über den Ventilantrieb des zweiten Ventils mitbewegt werden. Auch ist es denkbar, dass das dritte Ventil mit dem zweiten Ventil indirekt über die Schaltvorrichtung gekoppelt ist. Dies ist bspw. bei elektrischer Kopplung und einer elektrischen Schaltvorrichtung durchaus effektiv.It is also advantageous if the second valve with the third valve mechansich, electrically, hydraulically or pneumatically coupled. Depending on the configuration, an optimal and most efficient coupling, in particular also depending on the coupling of the second valve with the switching device, can be selected. In the case of mechanical coupling of the second and the third valve, the third valve, for example, does not require its own valve drive, but can be moved along via the valve drive of the second valve. It is also conceivable that the third valve is coupled to the second valve indirectly via the switching device. This is quite effective, for example, in electrical coupling and an electrical switching device.

Vorzugsweise ist das erste Ventil näher am ersten Druckbereich angeordnet als das zweite Ventil. Insbesondere ist damit der Niederdruckbereich mit einem Eigenmediumgesteuerten Ventil abgesichert. Da das erste Ventil im Falle eines zu hohen Drucks auf Seite des zweiten, also insbesondere des Hochdruckbereichs, als erstes schließt bzw. absperrt, wird so am effektivsten eine Kontamination mit unerwünschten Stoffen aus dem Hochdruckbereich verhindert.Preferably, the first valve is arranged closer to the first pressure region than the second valve. In particular, thus the low-pressure region is protected with a self-medium controlled valve. Since the first valve in the case of excessive pressure on the side of the second, ie in particular the high-pressure region, closes or shuts off first, the most effective way to prevent contamination with undesirable substances from the high-pressure region.

Vorteilhafterweise ist ein Druck im dritten Druckbereich niedriger als im zweiten Druckbereich, wobei der dritte Druckbereich insbesondere eine Verbindung zu einem Entsorgungssystem, einer Fackel und/oder Atmosphäre aufweist. Dadurch ist gewährleistet, dass Fluid, das im Falle eines undichten zweiten Ventils aus dem zweiten Druckbereich in den Bereich zwischen dem ersten und zweiten Ventil strömt, sofort über das dritte Ventil abgeführt wird, insbesondere an die Atmosphäre und/oder zur Abfackelung bzw. Entsorgung. Das Fluid kann somit auch nicht über ein eventuell undichtes erstes Ventil in den ersten Druckbereich strömen. Somit wirkt das dritte Ventil auch wie ein Entlüftungsventil.Advantageously, a pressure in the third pressure range is lower than in the second pressure range, the third pressure range in particular having a connection to a disposal system, a flare and / or atmosphere. This is ensures that fluid that flows in the case of a leaking second valve from the second pressure range in the area between the first and second valve is discharged immediately via the third valve, in particular to the atmosphere and / or flaring or disposal. The fluid can thus not flow through a possibly leaking first valve in the first pressure range. Thus, the third valve also acts as a vent valve.

Die Erfindung betrifft außerdem eine Verwendung der erläuterten erfindungsgemäßen Ventilanordnung zur Verhinderung einer ungewollten Rückströmung aus einem Hochdruckbereich in einen Niederdruckbereich, insbesondere im Falle einer Betriebsstörung. Diesbezüglich sei auf die obigen und die folgenden Erläuterungen verwiesen.The invention also relates to a use of the illustrated valve arrangement according to the invention for preventing an undesired backflow from a high-pressure region into a low-pressure region, in particular in the event of a malfunction. In this regard, reference is made to the above and the following explanations.

Weitere Vorteile und Ausgestaltungen der Erfindung ergeben sich aus der Beschreibung und der beiliegenden Zeichnung.Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Die Erfindung ist anhand eines Ausführungsbeispieles in der Zeichnung schematisch dargestellt und wird im Folgenden unter Bezugnahme auf die Zeichnung ausführlich beschrieben.The invention is illustrated schematically with reference to an embodiment in the drawing and will be described in detail below with reference to the drawing.

Figurenbeschreibungfigure description

  • Figur 1 zeigt eine Absperr-Ventilanordnung mit Rückschlagklappe und Sicherheitsventil bei einer Flüssigkeitsdosierung gemäß dem Stand der Technik. FIG. 1 shows a shut-off valve assembly with non-return valve and safety valve in a liquid metering according to the prior art.
  • Figur 2 zeigt eine bevorzugte Ausgestaltung einer erfindungsgemäßen Ventilanordnung. FIG. 2 shows a preferred embodiment of a valve arrangement according to the invention.
  • Figur 3 zeigt eine weitere bevorzugte Ausgestaltung einer erfindungsgemäßen Ventilanordnung. FIG. 3 shows a further preferred embodiment of a valve arrangement according to the invention.
Ausführungsformen der ErfindungEmbodiments of the invention

In Figur 1 ist schematisch ein System 100 für eine Flüssigkeitsdosierung gezeigt. Ein nachfüllbarer Tank 110 dient als Vorrat für ein als Flüssigkeit vorliegendes Fluid. Über ein Ventil 115 wird die Flüssigkeit an eine Pumpe 120 geleitet, mittels welcher ein entsprechender Druck aufgebaut werden kann, um die Flüssgkeit an einen Verteiler 160 weiterzuleiten.In FIG. 1 schematically shown a system 100 for a liquid metering. A refillable tank 110 serves as a supply for a liquid present as a liquid. Via a valve 115, the liquid is passed to a pump 120, by means of which a corresponding pressure can be built up to forward the liquid to a distributor 160.

Zwischen der Pumpe 120 und dem Verteiler 160 sind eine Rückschlagklappe 130 und ein weiteres Dosier- und/oder Absperrventil 150 angeordnet. Die Rückschlagklappe trennt das System 100 in einen Niederdruckbereich mit dem Tank 110 und einen Hochdruckbereich mit dem Verteiler 160, über welchen das Fluid gasförmig in einen Prozesskreislauf eingebracht wird. Hierbei ist zu beachten, dass üblicherweise als Hochdruckseite oder Hochdruckbereich ein Teil des Systems 100 bezeichnet wird, der für hohe Drücke ausgelegt ist. Im regulären Betrieb herrscht jedoch auf Niederdruckseite bzw. im Niederdruckbereich ein etwas höherer Druck als auf Hochdruckseite, oder zumindest einem Teil der Hochdruckseite, da sonst kein Transport des Fluids in Richtung Hochdruckseite möglich wäre.Between the pump 120 and the manifold 160, a check valve 130 and another metering and / or shut-off valve 150 are arranged. The check valve separates the system 100 into a low-pressure region with the tank 110 and a high-pressure region with the distributor 160, via which the fluid is introduced in gaseous form into a process circuit. It should be noted that usually as high-pressure side or high-pressure region, a part of the system 100 is designated, which is designed for high pressures. In normal operation, however, there is a slightly higher pressure on the low-pressure side or in the low-pressure region than on the high-pressure side, or at least part of the high-pressure side, since otherwise no transport of the fluid in the direction of the high-pressure side would be possible.

Zusätzlich ist zwischen der Pumpe 120 und der Rückschlagklappe 130 im Niederdruckbereich eine Abzweigung vorgesehen, die über ein Absperrventil 170 zu einem Sicherheitsventil 140 führt.In addition, a branch is provided between the pump 120 and the check valve 130 in the low-pressure region, which leads via a shut-off valve 170 to a safety valve 140.

Im Falle eines Überdrucks im Hochdruckbereich, bspw. aufgrund einer Betriebsstörung, schließt nun die Rückschlagklappe 130 selbsttätig. Dadurch soll verhindert werden, dass ein zulässiger Druck im Niederdruckbereich überschritten wird.In the case of an overpressure in the high-pressure region, for example due to a malfunction, now closes the check valve 130 automatically. This is to prevent that a permissible pressure in the low pressure range is exceeded.

In der Realität ist eine Rückschlagklappe jedoch nicht vollständig, d.h. zu hundert Prozent, dicht. Dies führt in der Regel daher trotzdem zu Überdruck auf der Niederdruckseite durch rückströmendes Gas. Dieser kann durch das Sicherheitsventil 140 - im Falle eines geöffneten Absperrventils 170 - abgebaut werden. Ein Sicherheitsventil 140 öffnet selbsttätig bei entsprechendem Überdruck, wobei die Höhe des Überdrucks, bei dem das Sicherheitsventil 140 öffnet, in der Regel eingestellt und/oder verstellt werden kann.In reality, however, a check valve is not complete, ie one hundred percent tight. Nevertheless, this usually leads to overpressure on the low pressure side due to backflowing gas. This can be reduced by the safety valve 140 - in the case of an open shut-off valve 170. A safety valve 140 opens automatically with appropriate overpressure, the height the overpressure at which the safety valve 140 opens, can be adjusted and / or adjusted as a rule.

Durch die Ventilanordnung im System 100 kann jedoch nicht verhindert werden, dass unerwünschte Stoffe, die sich im Hochdruckbereich im Fluid befinden, im Falle eines Überdrucks durch die undichte Rückschlagklappe 130 in den Niederdruckbereich gelangen.Due to the valve arrangement in the system 100, however, unwanted substances which are in the high-pressure region in the fluid can not be prevented from entering the low-pressure region in the event of overpressure by the leaking non-return flap 130.

In Figur 2 ist schematisch eine erfindungsgemäße Ventilanordnung 200 in einer bevorzugten Ausgestaltung dargestellt. Die Ventilanordnung 200 dient zur Verbindung eines als Niederdruckbereich ausgebildeten ersten Druckbereichs p1 mit einem als Hochdruckbereich ausgebildeten zweiten Druckbereich p2 in einem mit Fluid beaufschlagten System. Da die Ventilanordnung 200 zwei Seiten mit unterschiedlichen Druckbereichen verbindet, werden der Niederdruckbereich p1 auch als Niederdruckseite und der Hochdruckbereich p2 auch als Hochdruckseite bezeichnet. Hierbei ist zu beachten, dass üblicherweise als Hochdruckseite ein Teil des Systems bezeichnet wird, der für hohe Drücke ausgelegt ist. Im regulären Betrieb herrscht jedoch auf Niederdruckseite ein etwas höherer Druck als auf Hochdruckseite, oder zumindest einem Teil der Hochdruckseite, da sonst kein Transport des Fluids in Richtung Hochdruckseite möglich wäreIn FIG. 2 schematically a valve assembly 200 according to the invention is shown in a preferred embodiment. The valve arrangement 200 serves to connect a first pressure region p1 designed as a low-pressure region to a second pressure region p2 in the form of a high-pressure region in a fluid-pressurized system. Since the valve arrangement 200 connects two sides with different pressure ranges, the low-pressure region p1 is also referred to as the low-pressure side and the high-pressure region p2 is also referred to as the high-pressure side. It should be noted that usually referred to as high pressure side of a part of the system, which is designed for high pressures. In normal operation, however, there is a slightly higher pressure on the low-pressure side than on the high-pressure side, or at least part of the high-pressure side, since otherwise no transport of the fluid in the direction of the high-pressure side would be possible

Die Verbindung erfolgt über ein erstes Ventil 10 und ein dazu in Reihe geschaltetes zweites Ventil 20. Zwischen dem ersten Ventil 10 und dem zweiten Ventil 20 wird dabei ein Bereich p1/2 gebildet. Das erste Ventil 10 ist als ein Eigenmedium-gesteuertes Ventil ausgebildet. Es schließt selbsttätig, sobald der Druck, der im Hochdruckbereich p2, in diesem Fall auch und insbesondere im Bereich p1/2, anliegt, mindestens genau so hoch ist wie der Druck, der im Niederdruckbereich p1 anliegt.The connection is made via a first valve 10 and a second valve 20 connected in series therewith. A region p1 / 2 is formed between the first valve 10 and the second valve 20. The first valve 10 is designed as a self-medium-controlled valve. It closes automatically as soon as the pressure which prevails in the high-pressure region p2, in this case also and in particular in the region p1 / 2, is at least as high as the pressure which prevails in the low-pressure region p1.

Das erste Ventil 10 ist mit einer als Magnetventil ausgebildeten Schaltvorrichtung 40 gekoppelt. Diese Kopplung kann bspw. elektrisch sein. Im Falle einer anders ausgebildeten Schaltvorrichtung 40 kann eine andere Art der Kopplung jedoch geeigneter sein. Das Magnetventil 40 wiederum ist mit dem zweiten Ventil 20 gekoppelt. Diese Kopplung ist hier derart ausgebildet, dass das Magnetventil 40 eine Verbindung des zweiten Ventils 20 mit einem Druckluftspeicher 80 öffnen und schließen kann. Ein Ventilantrieb des zweiten Ventils 20 wird hier also mittels Druckluft, d.h. pneumatisch betrieben.The first valve 10 is coupled to a switching device 40 designed as a solenoid valve. This coupling can be, for example, electrical. In the case of a differently designed switching device 40, however, a different type of coupling may be more appropriate. The solenoid valve 40 in turn is coupled to the second valve 20. This coupling is designed here such that the solenoid valve 40 open a connection of the second valve 20 with a compressed air reservoir 80 and can close. A valve drive of the second valve 20 is thus here by means of compressed air, ie operated pneumatically.

Je nach Ausgestaltung kann das zweite Ventil 20 geschlossen werden, indem das Magnetventil 40 die Verbindung zum Druckluftspeicher öffnet oder trennt.Depending on the configuration, the second valve 20 can be closed by the solenoid valve 40 opens or disconnects the connection to the compressed air reservoir.

Der Bereich p1/2 weist eine Abzweigung zu einem dritten Ventil 30 auf, das den Bereich p1/2 mit einem dritten Druckbereich p3 verbindet. Der dritte Druckbereich p3 weist bspw. eine Verbindung zu einem Fackelsystem und somit annähernd Atmosphärendruck auf.The area p1 / 2 has a branch to a third valve 30 which connects the area p1 / 2 with a third pressure area p3. The third pressure range p3 has, for example, a connection to a flare system and thus approximately atmospheric pressure.

Das dritte Ventil 30 ist nun mit dem zweiten Ventil 20 derart gekoppelt, dass es automatisch geöffnet wird, sobald das zweite Ventil 20 geschlossen wird. Diese Kopplung kann bspw. mechanisch erfolgen. Auf diese Art benötigt das dritte Ventil 30 keinen eigenen Ventilantrieb, sondern wird durch den Ventilantrieb des zweiten Ventils 20, welcher wiederum mittels Druckluft betrieben wird, gesteuert.The third valve 30 is now coupled to the second valve 20 such that it is automatically opened as soon as the second valve 20 is closed. This coupling can be done, for example, mechanically. In this way, the third valve 30 does not require its own valve drive, but is controlled by the valve drive of the second valve 20, which in turn is operated by means of compressed air.

In Figur 3 ist schematisch eine erfindungsgemäße Ventilanordnung 300 in einer weiteren bevorzugten Ausgestaltung dargestellt. Die Ventilanordnung 300 unterscheidet sich von der in Figur 2 gezeigten Ventilanordnung 200 lediglich dadurch, dass das zweite Ventil 20 nicht unmittelbar mit dem dritten Ventil 30, sondern mittelbar über eine Schaltvorrichtung 40 gekoppelt ist. Das dritte Ventil 30 ist mit der Schaltvorrichtung 40 gekoppelt, bspw. ebenso wie das zweite Ventil 20 mittels Druckluftverbindung. Auf diese Art werden das zweite Ventil 20 und das dritte Ventil 30 jeweils, insbesondere gleichzeitig, von der Schaltvorrichtung 40 gesteuert, d.h. das zweite Ventil 20 wird geschlossen und das dritte Ventil 30 wird geöffnet.In FIG. 3 schematically a valve arrangement 300 according to the invention is shown in a further preferred embodiment. The valve arrangement 300 differs from the one in FIG FIG. 2 shown valve assembly 200 only in that the second valve 20 is not directly coupled to the third valve 30, but indirectly via a switching device 40. The third valve 30 is coupled to the switching device 40, for example. As well as the second valve 20 by means of compressed air connection. In this way, the second valve 20 and the third valve 30 are respectively, in particular simultaneously, controlled by the switching device 40, that is, the second valve 20 is closed and the third valve 30 is opened.

Die mit den Ventilanordnungen 200 und 300 erzielten Effekte sind jedoch gleich, unabhängig von der genauen Ansteuerung des zweiten Ventils 20 und des dritten Ventils 30. Daher wird im Folgenden bei der Beschreibung der Funktionsweise nicht zwischen beiden Ventilanordnungen unterschieden.However, the effects achieved with the valve assemblies 200 and 300 are the same irrespective of the precise driving of the second valve 20 and the third valve 30. Therefore, in the following description of the operation, no distinction is made between the two valve arrangements.

Wie bereits erwähnt, fließt im normalen Betrieb des Systems das Fluid vom Niederdruckbereich p1 zum Hochdruckbereich p2, wo es bspw. einem Prozess zugeführt wird. Das erste Ventil 10 und das zweite Ventil 20 sind dabei geöffnet, das dritte Ventil 30 ist geschlossen.As already mentioned, during normal operation of the system, the fluid flows from the low-pressure region p1 to the high-pressure region p2, where there is, for example, a process is supplied. The first valve 10 and the second valve 20 are opened, the third valve 30 is closed.

Kommt es im Hochdruckbereich p2 nun bspw. zu einer Betriebsstörung, woduch der Druck ansteigt, steigt auch im Bereich p1/2 der Druck an. Sobald nun der Druck im Bereich p1/2 mindestens so hoch ist wie im Niederdruckbereich p1, schließt das erste Ventil 10 selbsttätig. Je nachdem wie schnell ein solcher Druckanstieg abläuft und wie schnell das erste Ventil 10 reagieren kann und auf welche genauen Druckverhältnisse es eingestellt ist, schließt das erste Ventil 10 bereits bei Druckgleichheit zwischen dem Bereich p1/2 und dem Niederdruckbereich p1 oder aber auch erst bei einem gewissen Überdruck in dem Bereich p1/2, wobei Druckgleichheit insbesondere hinsichtlich eventueller Kontamination des Niederdruckbereichs p1 zu bevorzugen ist.If, for example, a malfunction occurs in the high-pressure region p2, as a result of which the pressure rises, the pressure also increases in the region p1 / 2. As soon as the pressure in the region p1 / 2 is at least as high as in the low-pressure region p1, the first valve 10 closes automatically. Depending on how fast such an increase in pressure takes place and how fast the first valve 10 can react and on which exact pressure conditions it is set, the first valve 10 already closes when the pressure equals between the range p1 / 2 and the low pressure range p1 or only at one certain overpressure in the range p1 / 2, wherein pressure equality is to be preferred in particular with regard to possible contamination of the low-pressure region p1.

Mit dem Schließen des ersten Ventils 10 geht auch ein Schließen des zweiten Ventils 20 einher, wie oben beschrieben. Es handelt sich hierbei also um eine doppelte Absperrung zwischen dem Niederdruckbereich p1 und dem Hochdruckbereich p2.The closing of the first valve 10 is accompanied by a closing of the second valve 20, as described above. This is therefore a double shut-off between the low-pressure region p1 and the high-pressure region p2.

Da gleichzeitig mit dem Schließen des zweiten Ventils 20 ein Öffnen des dritten Ventils 30 einhergeht, wird gewährleistet, dass der Druck im Niederdruckbereich p1 stets größer ist als der Druck im Bereich p1/2. Druck der sich durch ein mögliches undichtes zweites Ventil 20 im Bereich p1/2 durch überströmendes Fluid vom Hochdruckbereich p2 aufbauen würde, wird sofort über das dritte Ventil 30 abgebaut, da das Fluid bspw. zur Abfackelung und/oder an die Atmosphäre abgeführt wird. Das dritte Ventil 30 hat somit die Wirkung eines Entlüftungsventils.Since an opening of the third valve 30 is accompanied simultaneously with the closing of the second valve 20, it is ensured that the pressure in the low-pressure region p1 is always greater than the pressure in the region p1 / 2. Pressure which would build up by a possible leaking second valve 20 in the area p1 / 2 by overflowing fluid from the high pressure area p2, is degraded immediately via the third valve 30, since the fluid is discharged, for example. For flaring and / or to the atmosphere. The third valve 30 thus has the effect of a vent valve.

Da vom Hochdruckbereich p2 in Richtung Niederdruckbereich p1 strömendes Fluid durchweg über das dritte Ventil 30 abströmt, gelangt kein Fluid vom Hochdruckbereich p2 in den Niederdruckbereich p1. Somit können auch keine unerwünschten Stoffe oder Verunreinigungen vom Hochdruckbereich p2 in den Niederdruckbereich p1 gelangen.Since fluid flowing from the high-pressure region p2 in the direction of the low-pressure region p1 flows through the third valve 30, no fluid passes from the high-pressure region p2 into the low-pressure region p1. Thus, no unwanted substances or contaminants from the high-pressure region p2 can reach the low-pressure region p1.

Auch im Falle einer Flüssigkeitsdosierung kann somit kein Gas vom Hochdruckbereich in den Niederdruckbereich p1 gelangen, wodurch Störungen durch bspw. Pumpenausfall auftreten könnten.Even in the case of a liquid metering, therefore, no gas can pass from the high-pressure region into the low-pressure region p1, as a result of which disturbances could occur, for example due to a pump failure.

Claims (13)

  1. Valve arrangement (200, 300) for a system which is loaded with a fluid, for connecting a first pressure region (p1) to a second pressure region (p2) by means of a first valve (10) and a second valve (20) which is connected in series thereto,
    a third valve (30) connecting a region (p1/2) between the first valve (10) and the second valve (20) to a third pressure region (p3);
    characterized in that
    the first valve (10) is set up such that it closes when a pressure which prevails on the side of the second pressure region (p2) is at least as high as a pressure which prevails on the side of the first pressure region (p1);
    the first valve (10) being coupled to the second valve (20) in such a way that the second valve (20) closes when the first valve (10) closes;
    the second valve (20) being coupled to the third valve (30) in such a way that the third valve (30) opens when the second valve (20) closes.
  2. Valve arrangement according to Claim 1, the first valve (10) being coupled via a switching apparatus (40) to the second valve (20).
  3. Valve arrangement according to Claim 2, the switching apparatus (40) having a valve, in particular a solenoid valve.
  4. Valve arrangement according to Claim 2 or 3, the first valve (10) being coupled to the switching apparatus (40) mechanically, pneumatically or hydraulically.
  5. Valve arrangement according to one of Claims 2 to 4, the second valve (20) being coupled to the switching apparatus (40) electrically, hydraulically or pneumatically.
  6. Valve arrangement according to one of the preceding claims, the second valve (20) being coupled to the third valve (30) mechanically, electrically, hydraulically or pneumatically.
  7. Valve arrangement according to one of Claims 1 to 5, the third valve (30) being coupled to the switching apparatus (40) electrically, hydraulically or pneumatically.
  8. Valve arrangement according to one of the preceding claims, the first valve (10) being arranged closer to the first pressure region (p1) than the second valve (20).
  9. Valve arrangement according to one of the preceding claims, the first pressure region (p1) comprising a low-pressure region.
  10. Valve arrangement according to one of the preceding claims, the second pressure region (p2) comprising a high-pressure region.
  11. Valve arrangement according to one of the preceding claims, a pressure in the third pressure region (p3) being lower than in the first pressure region (p1).
  12. Valve arrangement according to Claim 10, the third pressure region (p3) having a connection to a disposal system, a flare system and/or atmosphere.
  13. Use of a valve arrangement (200) according to Claims 9 and 10 for preventing an undesired back-flow from the high-pressure region into the low-pressure region.
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