WO2024099661A1 - Valve assembly for a fuel gas tank, fuel gas tank comprising a valve assembly - Google Patents

Valve assembly for a fuel gas tank, fuel gas tank comprising a valve assembly Download PDF

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Publication number
WO2024099661A1
WO2024099661A1 PCT/EP2023/078008 EP2023078008W WO2024099661A1 WO 2024099661 A1 WO2024099661 A1 WO 2024099661A1 EP 2023078008 W EP2023078008 W EP 2023078008W WO 2024099661 A1 WO2024099661 A1 WO 2024099661A1
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WO
WIPO (PCT)
Prior art keywords
fuel gas
valve
path
gas tank
valve assembly
Prior art date
Application number
PCT/EP2023/078008
Other languages
German (de)
French (fr)
Inventor
Eckhart Festerling
Holger Rapp
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2024099661A1 publication Critical patent/WO2024099661A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0326—Valves electrically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0382—Constructional details of valves, regulators
    • F17C2205/0385—Constructional details of valves, regulators in blocks or units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0114—Propulsion of the fluid with vacuum injectors, e.g. venturi
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0184—Fuel cells

Definitions

  • Valve assembly for a fuel gas tank for a fuel gas tank, fuel gas tank with valve assembly
  • the invention relates to a valve assembly for a fuel gas tank.
  • the invention also relates to a fuel gas tank with a valve assembly according to the invention.
  • the fuel gas can in particular be hydrogen or natural gas, which is stored under pressure in a fuel gas tank.
  • the preferred field of application of the invention is fuel cell and/or gas vehicles that are powered by a fuel gas.
  • the fuel gas tank is usually designed as a high-pressure tank, in particular as a high-pressure gas bottle.
  • a high-pressure tank always requires a shut-off valve to seal the tank tightly when the vehicle is not in use.
  • the shut-off valve is usually designed as a valve that is closed when there is no current.
  • the shut-off valve is usually integrated into a valve assembly that allows both the extraction of fuel gas from the fuel gas tank and the filling of the fuel gas tank with fuel gas.
  • the valve assembly has a base body in which a extraction path and a filling path are formed.
  • a controllable shut-off valve is integrated into the extraction path and a check valve is integrated into the filling path.
  • the check valve prevents fuel gas from escaping from the fuel gas tank via the filling path.
  • a further check valve can be arranged in the extraction path so that the flow direction in the two paths is determined via the check valves.
  • DE 10 2016 008 443 A1 provides an example of a tank valve for mounting on a compressed gas container, which has a base body with a gas connection, via which the compressed gas container can be filled on the one hand and gas can be removed from the compressed gas container on the other.
  • the gas connection is divided into a refueling line and a withdrawal line, with a withdrawal valve arranged in the withdrawal line.
  • a check valve connected in series with the withdrawal valve blocks the flow against the intended flow direction when gas is withdrawn. The check valve thus prevents gas from flowing into the compressed gas container via the withdrawal line during refueling.
  • Another check valve is integrated in the refueling line, which opens in the refueling direction and closes in the withdrawal direction.
  • the present invention is concerned with the task of preventing flow through the extraction or shut-off valve integrated in the extraction path in the opposite flow direction even without a check valve in the extraction path.
  • a valve assembly for a fuel gas tank is to be created that is as simple as possible in design.
  • valve assembly with the features of claim 1 is proposed.
  • Advantageous further developments of the invention can be found in the subclaims.
  • a fuel gas tank with a valve assembly according to the invention is specified.
  • the valve assembly proposed for a fuel gas tank comprises a base body in which a removal path with an integrated shut-off valve for removing fuel gas from the fuel gas tank and a refueling path with an integrated check valve for refueling the fuel gas tank with fuel gas are formed.
  • the removal path and the refueling path are combined within the base body in a path that opens into a common gas connection.
  • the transition from the refueling path to the path is designed as a cross-sectional constriction and the removal path is connected in the area of the cross-sectional constriction.
  • the cross-sectional constriction and the connection of the extraction path in the area of the cross-sectional constriction form a Venturi nozzle, with the help of which the pressure in the extraction path, namely in the extraction direction downstream of the shut-off valve, can be reduced to such an extent (“Bernoulli equation”) that the shut-off valve remains safely closed when the fuel gas tank is filled with fuel gas.
  • the effect of the Venturi nozzle thus replaces a check valve arranged in the extraction path.
  • a diffuser is connected to the cross-sectional constriction in the refueling direction.
  • the flow cross-section of the fuel gas is therefore not suddenly increased again downstream of the cross-sectional constriction in the refueling direction, but a gentle transition is created via the diffuser.
  • This results in less turbulence in the fuel gas flow and a higher pressure recovery downstream of the Venturi nozzle, which makes it easier to open the check valve arranged in the refueling path.
  • the pressure difference between a pressure P2,RSV between the diffuser and the check valve in the refueling path increases. and thus also the pressure difference between the pressure pi in the fuel gas tank and the pressure P2,sov in the extraction path.
  • the shut-off valve is preferably designed as an electrically controllable and normally closed valve, which has a valve member that is acted upon by the spring force of a closing spring in the direction of a valve seat.
  • the shut-off valve is therefore designed as a normally closed valve, so that it meets the requirements placed on a shut-off valve for fuel gas tanks.
  • the shut-off valve can be designed to be particularly compact and robust.
  • a solenoid coil is energized, generating a magnetic force that lifts the valve element out of the valve seat against the spring force of the closing spring.
  • the closing spring presses the valve element into the valve seat.
  • a pneumatic force acts on the valve element via the pressure difference pi-p2,sov. Since, with the appropriate design of the Venturi nozzle, it is ensured that the pressure P2,sov does not rise above the pressure pi when refueling, the pneumatic force acting on the valve element of the shut-off valve always has a closing effect. A pneumatic force that counteracts the spring force of the closing spring and opens the shut-off valve unintentionally is thus reliably avoided.
  • the check valve integrated in the refueling path preferably has a closing spring whose spring force is designed such that the opening pressure of this check valve is smaller than the opening pressure of the shut-off valve in the reverse direction.
  • the pressure difference required to open the check valve is therefore smaller than that required to open the shut-off valve in the reverse direction. This measure further reduces the risk of the shut-off valve opening unintentionally.
  • the common gas connection is designed as a connecting piece, preferably as a connecting piece with an external thread.
  • the connecting piece facilitates the connection of an external gas line, via which fuel gas can be taken from the fuel gas tank and fuel gas can be fed into the fuel gas tank during refueling. If the connecting piece has an external thread, external thread, the external gas line can be screwed onto the connecting piece so that a high-pressure-resistant connection is established between the gas line and the valve assembly via the screw connection.
  • the base body preferably also has a connecting section for connecting to the fuel gas tank.
  • the valve assembly can be easily mounted on a fuel gas tank via the connecting section.
  • the valve assembly can be inserted into a bottle neck of a fuel gas tank designed as a high-pressure gas bottle via the connecting section.
  • the connecting section can also have an external thread so that it can be screwed into the bottle neck in order to achieve a high-pressure-resistant connection via the screw connection.
  • the fuel gas tank also proposed is characterized in that it has a valve assembly according to the invention.
  • the valve assembly is preferably inserted into the fuel gas tank in sections so that the common gas connection is accessible from the outside. Since the extraction path and the refueling path are brought together and lead as one path into the common gas connection of the valve assembly, only one gas line needs to be connected for extracting fuel gas and for refueling the fuel gas tank with fuel gas.
  • the Venturi nozzle integrated into the paths prevents the shut-off valve arranged in the extraction path from opening accidentally during refueling, so that the extraction path does not need to be secured by another check valve.
  • the illustrated valve assembly 1 serves to remove fuel gas from a fuel gas tank 2 and to fill the fuel gas tank 2 with fuel gas, in particular with hydrogen or with natural gas.
  • the valve assembly 1 shown has a base body 3 with a connecting section 16, via which the valve assembly 1 is connected to the fuel gas tank 2. At the other end, the base body 3 forms a gas connection 8 for connecting an external gas line (not shown).
  • a removal path 4 and a refueling path 5 as well as a path 9 are formed, via which the removal path 4 and the refueling path 5 are brought together.
  • the path 9 opens into the common gas connection 8.
  • a shut-off valve 6 is integrated into the extraction path 4, which can be controlled electrically and is designed as a normally closed valve.
  • the shut-off valve 6 has an axially movable valve member 12, which is acted upon by the spring force of a closing spring 14 in the direction of a valve seat 13. The shut-off valve 6 ensures that no fuel gas can escape from the fuel gas tank 2, even in the event of a fault.
  • a check valve 7 with a closing spring 15 is integrated into the refueling path 5, via which the opening force of the check valve 7 is predetermined.
  • the check valve 7 opens against the spring force of the closing spring 15 in the refueling direction (see arrow 17).
  • a pressure P2,RSV prevails in the refueling direction upstream of the check valve 7, which is slightly lower than a refueling pressure PT at the common gas connection 8, but greater than a pressure pi in the fuel gas tank 2, the pressure difference causing a pneumatic force opening the check valve 7, which is greater than the spring force of the closing spring 15, so that the check valve 7 opens.
  • the refueling path 5 has a cross-sectional constriction 10, in the area of which the extraction path 4 is connected.
  • the cross-sectional constriction 10 forms a Venturi nozzle, which ensures that in the extraction path 4 in the extraction direction downstream of the shut-off valve 4 there is a pressure P2,sov that is always lower than the pressure pi in the fuel gas tank 2.
  • a valve assembly according to the invention can have additional valves and/or components in addition to the valves shown.
  • a manual shut-off and/or blow-off valve, a thermal and/or pressure-controlled safety valve and a temperature and/or pressure sensor can be integrated into the valve assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The invention relates to a valve assembly (1) for a fuel gas tank (2), comprising a base body (3) in which an extraction path (4) with integrated shut-off valve (6) for extracting fuel gas from the fuel gas tank (2) and a refuelling path (5) with integrated non-return valve (7) for refuelling the fuel gas tank (2) with fuel gas are formed, wherein the extraction path (4) and the refuelling path (5) are brought together within the base body (3) in a path (9) which opens into a common gas connection (8). According to the invention, the transition of the refuelling path (5) into the path (9) is designed as a cross-sectional constriction (10) and the extraction path (4) is connected in the area of the cross-sectional constriction (10).

Description

Beschreibung Description
Ventilbaugruppe für einen Brenngastank, Brenngastank mit Ventilbaugruppe Valve assembly for a fuel gas tank, fuel gas tank with valve assembly
Die Erfindung betrifft eine Ventilbaugruppe für einen Brenngastank. Ferner betrifft die Erfindung einen Brenngastank mit einer erfindungsgemäßen Ventilbaugruppe. Bei dem Brenngas kann es sich insbesondere um Wasserstoff oder Erdgas handeln, das in einem Brenngastank unter Druck gespeichert wird. The invention relates to a valve assembly for a fuel gas tank. The invention also relates to a fuel gas tank with a valve assembly according to the invention. The fuel gas can in particular be hydrogen or natural gas, which is stored under pressure in a fuel gas tank.
Bevorzugter Anwendungsbereich der Erfindung sind Brennstoffzellen- und/oder Gasfahrzeuge, die mit Hilfe eines Brenngases angetrieben werden. The preferred field of application of the invention is fuel cell and/or gas vehicles that are powered by a fuel gas.
Stand der Technik State of the art
Bekannt sind mobile Brenngastanksysteme mit mindestens einem Brenngastank zur Speicherung von Brenngas, beispielsweise Wasserstoff oder Erdgas. Der Brenngastank ist dabei in der Regel als Hochdrucktank ausgelegt, insbesondere als Hochdruck- Gasflasche. Ein Hochdrucktank benötigt immer ein Absperrventil, um den Tank dicht abzusperren, wenn das Fahrzeug nicht in Betrieb ist. Aus Gründen der Sicherheit ist das Absperrventil in der Regel als stromlos geschlossenes Ventil ausgeführt. Mobile fuel gas tank systems with at least one fuel gas tank for storing fuel gas, such as hydrogen or natural gas, are known. The fuel gas tank is usually designed as a high-pressure tank, in particular as a high-pressure gas bottle. A high-pressure tank always requires a shut-off valve to seal the tank tightly when the vehicle is not in use. For safety reasons, the shut-off valve is usually designed as a valve that is closed when there is no current.
Das Absperrventil ist üblicherweise in eine Ventilbaugruppe integriert, die sowohl die Entnahme von Brenngas aus dem Brenngastank als auch das Betanken des Brenngastanks mit Brenngas ermöglicht. Die Ventilbaugruppe weist hierzu einen Grundkörper auf, in dem ein Entnahmepfad und ein Betankungspfad ausgebildet sind. In den Entnahmepfad ist ein ansteuerbares Absperrventil und in den Betankungspfad ist ein Rückschlagventil integriert. Das Rückschlagventil verhindert ein Entweichen von Brenngas aus dem Brenngastank über den Betankungspfad. Im Entnahmepfad kann ein weiteres Rückschlagventil angeordnet sein, so dass über die Rückschlagventile die Strömungsrichtung in den beiden Pfaden festgelegt ist. Aus der DE 10 2016 008 443 Al geht beispielhaft ein Tankventil zur Montage an einem Druckgasbehälter hervor, das einen Grundkörper mit einem Gasanschluss aufweist, über den einerseits der Druckgasbehälter betankt, andererseits Gas aus dem Druckgasbehälter entnommen werden kann. Innerhalb des Grundkörpers teilt sich der Gasanschluss in eine Betankungsleitung und eine Entnahmeleitung auf, wobei in der Entnahmeleitung ein Entnahmeventil angeordnet ist. Ein in Reihe mit dem Entnahmeventil geschaltetes Rückschlagventil sperrt bei der Entnahme von Gas den Durchfluss entgegen der vorgesehenen Strömungsrichtung. Das Rückschlagventil verhindert somit, dass beim Betanken Gas über die Entnahmeleitung in den Druckgasbehälter strömt. In der Betankungsleitung ist ein weiteres Rückschlagventil integriert, das in Betankungsrichtung öffnet und in Entnahmerichtung sperrt. The shut-off valve is usually integrated into a valve assembly that allows both the extraction of fuel gas from the fuel gas tank and the filling of the fuel gas tank with fuel gas. For this purpose, the valve assembly has a base body in which a extraction path and a filling path are formed. A controllable shut-off valve is integrated into the extraction path and a check valve is integrated into the filling path. The check valve prevents fuel gas from escaping from the fuel gas tank via the filling path. A further check valve can be arranged in the extraction path so that the flow direction in the two paths is determined via the check valves. DE 10 2016 008 443 A1 provides an example of a tank valve for mounting on a compressed gas container, which has a base body with a gas connection, via which the compressed gas container can be filled on the one hand and gas can be removed from the compressed gas container on the other. Within the base body, the gas connection is divided into a refueling line and a withdrawal line, with a withdrawal valve arranged in the withdrawal line. A check valve connected in series with the withdrawal valve blocks the flow against the intended flow direction when gas is withdrawn. The check valve thus prevents gas from flowing into the compressed gas container via the withdrawal line during refueling. Another check valve is integrated in the refueling line, which opens in the refueling direction and closes in the withdrawal direction.
Die vorliegende Erfindung ist mit der Aufgabe befasst, ein Durchströmen des in den Entnahmepfad integrierten Entnahme- bzw. Absperrventils in umgekehrter Strömungsrichtung auch ohne Rückschlagventil im Entnahmepfad zu verhindern. Auf diese Weise soll eine Ventilbaugruppe für einen Brenngastank geschaffen werden, die möglichst einfach aufgebaut ist. The present invention is concerned with the task of preventing flow through the extraction or shut-off valve integrated in the extraction path in the opposite flow direction even without a check valve in the extraction path. In this way, a valve assembly for a fuel gas tank is to be created that is as simple as possible in design.
Zur Lösung der Aufgabe wird die Ventilbaugruppe mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Des Weiteren wird ein Brenngastank mit einer erfindungsgemäßen Ventilbaugruppe angegeben. To solve the problem, the valve assembly with the features of claim 1 is proposed. Advantageous further developments of the invention can be found in the subclaims. Furthermore, a fuel gas tank with a valve assembly according to the invention is specified.
Offenbarung der Erfindung Disclosure of the invention
Die für einen Brenngastank vorgeschlagene Ventilbaugruppe umfasst einen Grundkörper, in dem ein Entnahmepfad mit integriertem Absperrventil zur Entnahme von Brenngas aus dem Brenngastank sowie ein Betankungspfad mit integriertem Rückschlagventil zum Betanken des Brenngastanks mit Brenngas ausgebildet sind. Der Entnahmepfad und der Betankungspfad sind innerhalb des Grundkörpers in einem Pfad zusammengeführt, der in einen gemeinsamen Gasanschluss mündet. Erfindungsgemäß ist der Übergang des Betankungspfads in den Pfad als Querschnittsverengung ausgeführt und der Entnahmepfad ist im Bereich der Querschnittsverengung angebunden. Die Querschnittsverengung und die Anbindung des Entnahmepfads im Bereich der Querschnittsverengung bilden eine Venturi-Düse aus, mit deren Hilfe der Druck im Entnahmepfad, und zwar in Entnahmerichtung stromabwärts des Absperrventils, soweit abgesenkt werden kann („Bernoulli-Gleichung“), dass das Absperrventil beim Betanken des Brenngastanks mit Brenngas sicher geschlossen bleibt. The valve assembly proposed for a fuel gas tank comprises a base body in which a removal path with an integrated shut-off valve for removing fuel gas from the fuel gas tank and a refueling path with an integrated check valve for refueling the fuel gas tank with fuel gas are formed. The removal path and the refueling path are combined within the base body in a path that opens into a common gas connection. According to the invention, the transition from the refueling path to the path is designed as a cross-sectional constriction and the removal path is connected in the area of the cross-sectional constriction. The cross-sectional constriction and the connection of the extraction path in the area of the cross-sectional constriction form a Venturi nozzle, with the help of which the pressure in the extraction path, namely in the extraction direction downstream of the shut-off valve, can be reduced to such an extent (“Bernoulli equation”) that the shut-off valve remains safely closed when the fuel gas tank is filled with fuel gas.
Im Brenngastank herrscht ein Druck pi. Sofern keine Betankung stattfindet, herrscht bei geschlossenem Absperrventil im gemeinsamen Pfad im Gasanschluss stromabwärts des Absperrventils ein Druck P2, der kleiner als der Druck pi ist, so dass auf das Absperrventil eine pneumatische Schließkraft wirkt. Beim Betanken des Brenngastanks mit Brenngas muss zum Öffnen des im Betankungspfad angeordneten Rückschlagventils am gemeinsamen Gasanschluss ein Betankungsdruck PT bereitgestellt werden, der zumindest um den Öffnungsdruck des Rückschlagventils größer als der Druck pi im Brenngastank ist, da andernfalls das Rückschlagventil nicht öffnet. Damit besteht die Gefahr, dass der Druck im Entnahmepfad stromabwärts des Absperrventils, nachfolgend als Druck P2,sov bezeichnet, ebenfalls auf den Betankungsdruck PT ansteigt. Dies hätte dann zur Folge, dass das im Entnahmepfad angeordnete Absperrventil un- bestromt öffnet und dieses in Rückwärtsrichtung durchströmt wird. Aufgrund der Querschnittsverengung und der Anbindung des Entnahmepfads im Bereich der Querschnittsverengung kann der Druck P2,sov im Entnahmepfad beim Betanken jedoch so weit abgesenkt werden, dass P2,sov stets kleiner als pi bleibt und ein ungewolltes Öffnen des Absperrventils verhindert wird. There is a pressure pi in the fuel gas tank. If no refueling is taking place, when the shut-off valve in the common path is closed in the gas connection downstream of the shut-off valve, there is a pressure P2 that is lower than the pressure pi, so that a pneumatic closing force acts on the shut-off valve. When refueling the fuel gas tank with fuel gas, a refueling pressure PT must be provided at the common gas connection to open the check valve arranged in the refueling path that is greater than the pressure pi in the fuel gas tank by at least the opening pressure of the check valve, otherwise the check valve will not open. This means that there is a risk that the pressure in the extraction path downstream of the shut-off valve, hereinafter referred to as pressure P2,sov, will also rise to the refueling pressure PT. This would then result in the shut-off valve arranged in the extraction path opening without power and flow through it in the reverse direction. However, due to the cross-sectional constriction and the connection of the extraction path in the area of the cross-sectional constriction, the pressure P2,sov in the extraction path can be reduced during refueling to such an extent that P2,sov always remains smaller than pi and an unintentional opening of the shut-off valve is prevented.
Die Wirkung der Venturi-Düse ersetzt somit ein im Entnahmepfad angeordnetes Rückschlagventil. The effect of the Venturi nozzle thus replaces a check valve arranged in the extraction path.
Vorteilhafterweise schließt sich in Betankungsrichtung ein Diffusor an die Querschnittsverengung an. Der Strömungsquerschnitt des Brenngases wird demnach in Betankungsrichtung stromabwärts der Querschnittsverengung nicht schlagartig wieder angehoben, sondern es wird über den Diffusor ein sanfter Übergang geschaffen. Dadurch kommt es zu weniger Verwirbelungen im Brenngasstrom und einer höheren Druckrückgewinnung stromabwärts der Venturi-Düse, die das Öffnen des im Betankungspfad angeordneten Rückschlagventils erleichtert. Zugleich steigt die Druckdifferenz zwischen einem Druck P2,RSV zwischen Diffusor und Rückschlagventil im Betankungspfad und damit auch die Druckdifferenz zwischen dem Druck pi im Brenngastank und dem Druck P2,sov im Entnahmepfad. Advantageously, a diffuser is connected to the cross-sectional constriction in the refueling direction. The flow cross-section of the fuel gas is therefore not suddenly increased again downstream of the cross-sectional constriction in the refueling direction, but a gentle transition is created via the diffuser. This results in less turbulence in the fuel gas flow and a higher pressure recovery downstream of the Venturi nozzle, which makes it easier to open the check valve arranged in the refueling path. At the same time, the pressure difference between a pressure P2,RSV between the diffuser and the check valve in the refueling path increases. and thus also the pressure difference between the pressure pi in the fuel gas tank and the pressure P2,sov in the extraction path.
Bevorzugt ist das Absperrventil als elektrisch ansteuerbares und stromlos geschlossenes Ventil ausgeführt, das ein Ventilglied aufweist, das in Richtung eines Ventilsitzes von der Federkraft einer Schließfeder beaufschlagt ist. Das Absperrventil ist demnach als stromlos geschlossenes Ventil ausgeführt, so dass es die an ein Absperrventil für Brenngastanks gestellten Anforderungen erfüllt. Als elektrisch ansteuerbares Ventil kann das Absperrventil besonders kompakt und robust ausgeführt werden. The shut-off valve is preferably designed as an electrically controllable and normally closed valve, which has a valve member that is acted upon by the spring force of a closing spring in the direction of a valve seat. The shut-off valve is therefore designed as a normally closed valve, so that it meets the requirements placed on a shut-off valve for fuel gas tanks. As an electrically controllable valve, the shut-off valve can be designed to be particularly compact and robust.
Zum Öffnen des Absperrventils wird eine Magnetspule bestromt, so dass eine Magnetkraft erzeugt wird, mit deren Hilfe das Ventilglied entgegen der Federkraft der Schließfeder aus dem Ventilsitz gehoben wird. Bei unbestromter Magnetspule drückt die Schließfeder das Ventilglied in den Ventilsitz. Zusätzlich zur Schließkraft der Schließfeder wirkt über die Druckdifferenz pi-p2,sov eine pneumatische Kraft auf das Ventilglied. Da bei entsprechender Auslegung der Venturi-Düse sichergestellt ist, dass beim Betanken der Druck P2,sov nicht über den Druck pi steigt, wirkt die auf das Ventilglied des Absperrventils wirkende pneumatische Kraft immer schließend. Eine pneumatische Kraft, die der Federkraft der Schließfeder entgegenwirkt und das Absperrventil ungewollt öffnet, wird somit sicher vermieden. To open the shut-off valve, a solenoid coil is energized, generating a magnetic force that lifts the valve element out of the valve seat against the spring force of the closing spring. When the solenoid coil is de-energized, the closing spring presses the valve element into the valve seat. In addition to the closing force of the closing spring, a pneumatic force acts on the valve element via the pressure difference pi-p2,sov. Since, with the appropriate design of the Venturi nozzle, it is ensured that the pressure P2,sov does not rise above the pressure pi when refueling, the pneumatic force acting on the valve element of the shut-off valve always has a closing effect. A pneumatic force that counteracts the spring force of the closing spring and opens the shut-off valve unintentionally is thus reliably avoided.
Ferner bevorzugt weist das in den Betankungspfad integrierte Rückschlagventil eine Schließfeder auf, deren Federkraft derart ausgelegt ist, dass der Öffnungsdruck dieses Rückschlagventils kleiner ist als der Öffnungsdruck des Absperrventils in Rückwärtsrichtung. Damit ist die zum Öffnen des Rückschlagventils benötigte Druckdifferenz kleiner als die zum Öffnen des Absperrventils in Rückwärtsrichtung. Durch diese Maßnahme wird die Gefahr eines unbeabsichtigten Öffnens des Absperrventils weiter gesenkt. Furthermore, the check valve integrated in the refueling path preferably has a closing spring whose spring force is designed such that the opening pressure of this check valve is smaller than the opening pressure of the shut-off valve in the reverse direction. The pressure difference required to open the check valve is therefore smaller than that required to open the shut-off valve in the reverse direction. This measure further reduces the risk of the shut-off valve opening unintentionally.
Des Weiteren wird vorgeschlagen, dass der gemeinsame Gasanschluss als Anschlussstutzen, vorzugsweise als Anschlussstutzen mit einem Außengewinde, ausgeführt ist. Der Anschlussstutzen erleichtert den Anschluss einer externen Gasleitung, über die Brenngas aus dem Brenngastank entnommen sowie Brenngas dem Brenngastank beim Betanken zugeführt werden kann. Sofern der Anschlussstutzen ein Au- ßengewinde aufweist, kann die externe Gasleitung auf den Anschlussstutzen aufgeschraubt werden, so dass über die Schraubverbindung eine hochdruckfeste Verbindung zwischen der Gasleitung und der Ventilbaugruppe hergestellt ist. It is also proposed that the common gas connection is designed as a connecting piece, preferably as a connecting piece with an external thread. The connecting piece facilitates the connection of an external gas line, via which fuel gas can be taken from the fuel gas tank and fuel gas can be fed into the fuel gas tank during refueling. If the connecting piece has an external thread, external thread, the external gas line can be screwed onto the connecting piece so that a high-pressure-resistant connection is established between the gas line and the valve assembly via the screw connection.
Der Grundkörper weist weiterhin vorzugsweise einen Verbindungsabschnitt zur Verbindung mit dem Brenngastank auf. Über den Verbindungsabschnitt kann die Ventilbaugruppe einfach an einem Brenngastank montiert werden. Beispielsweise kann die Ventilbaugruppe über den Verbindungsabschnitt in einen Flaschenhals eines als Hochdruck-Gasflasche ausgeführten Brenngastank eingesetzt werden. Der Verbindungsabschnitt kann ferner ein Außengewinde aufweisen, so dass er in den Flaschenhals einschraubbar ist, um über die Schraubverbindung eine hochdruckfeste Verbindung zu erzielen. The base body preferably also has a connecting section for connecting to the fuel gas tank. The valve assembly can be easily mounted on a fuel gas tank via the connecting section. For example, the valve assembly can be inserted into a bottle neck of a fuel gas tank designed as a high-pressure gas bottle via the connecting section. The connecting section can also have an external thread so that it can be screwed into the bottle neck in order to achieve a high-pressure-resistant connection via the screw connection.
Der darüber hinaus vorgeschlagene Brenngastank zeichnet sich dadurch aus, dass er eine erfindungsgemäße Ventilbaugruppe aufweist. Vorzugsweise ist die Ventilbaugruppe abschnittsweise in den Brenngastank eingesetzt, so dass der gemeinsame Gasanschluss von außen zugänglich ist. Da der Entnahmepfad und der Betankungspfad zusammengeführt werden und als ein Pfad in den gemeinsamen Gasanschluss der Ventilbaugruppe münden, muss nur eine Gasleitung zur Entnahme von Brenngas sowie zum Betanken des Brenngastanks mit Brenngas angeschlossen werden. Die in die Pfade integrierte Venturi-Düse verhindert beim Betanken ein ungewolltes Öffnen des im Entnahmepfad angeordneten Absperrventils, so dass der Entnahmepfad nicht durch ein weiteres Rückschlagventil abgesichert werden muss. The fuel gas tank also proposed is characterized in that it has a valve assembly according to the invention. The valve assembly is preferably inserted into the fuel gas tank in sections so that the common gas connection is accessible from the outside. Since the extraction path and the refueling path are brought together and lead as one path into the common gas connection of the valve assembly, only one gas line needs to be connected for extracting fuel gas and for refueling the fuel gas tank with fuel gas. The Venturi nozzle integrated into the paths prevents the shut-off valve arranged in the extraction path from opening accidentally during refueling, so that the extraction path does not need to be secured by another check valve.
Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der beigefügten Zeichnung näher erläutert. Diese zeigt eine schematische Darstellung einer erfindungsgemäßen Ventilbaugruppe für einen Brenngastank. A preferred embodiment of the invention is explained in more detail below with reference to the accompanying drawing. This shows a schematic representation of a valve assembly according to the invention for a fuel gas tank.
Ausführliche Beschreibung der Zeichnung Detailed description of the drawing
Die dargestellte erfindungsgemäße Ventilbaugruppe 1 dient der Entnahme von Brenngas aus einem Brenngastank 2 sowie dem Betanken des Brenngastanks 2 mit Brenngas, insbesondere mit Wasserstoff oder mit Erdgas. Die dargestellte Ventilbaugruppe 1 weist einen Grundkörper 3 mit einem Verbindungsabschnitt 16 auf, über den die Ventilbaugruppe 1 mit dem Brenngastank 2 verbunden ist. Andernends bildet der Grundkörper 3 einen Gasanschluss 8 für den Anschluss einer externen Gasleitung (nicht dargestellt) aus. Im Grundkörper 3 sind ein Entnahmepfad 4 sowie ein Betankungspfad 5 sowie ein Pfad 9 ausgebildet, über den der Entnahmepfad 4 und der Betankungspfad 5 zusammengeführt werden. Der Pfad 9 mündet in den gemeinsamen Gasanschluss 8. The illustrated valve assembly 1 according to the invention serves to remove fuel gas from a fuel gas tank 2 and to fill the fuel gas tank 2 with fuel gas, in particular with hydrogen or with natural gas. The valve assembly 1 shown has a base body 3 with a connecting section 16, via which the valve assembly 1 is connected to the fuel gas tank 2. At the other end, the base body 3 forms a gas connection 8 for connecting an external gas line (not shown). In the base body 3, a removal path 4 and a refueling path 5 as well as a path 9 are formed, via which the removal path 4 and the refueling path 5 are brought together. The path 9 opens into the common gas connection 8.
In den Entnahmepfad 4 ist ein Absperrventil 6 integriert, das elektrisch ansteuerbar und als stromlos geschlossenes Ventil ausgeführt ist. Das Absperrventil 6 weist ein axial bewegliches Ventilglied 12 auf, das in Richtung eines Ventilsitzes 13 von der Federkraft einer Schließfeder 14 beaufschlagt ist. Das Absperrventil 6 stellt sicher, dass auch in einem Fehlerfall kein Brenngas aus dem Brenngastank 2 entweichen kann. A shut-off valve 6 is integrated into the extraction path 4, which can be controlled electrically and is designed as a normally closed valve. The shut-off valve 6 has an axially movable valve member 12, which is acted upon by the spring force of a closing spring 14 in the direction of a valve seat 13. The shut-off valve 6 ensures that no fuel gas can escape from the fuel gas tank 2, even in the event of a fault.
In den Betankungspfad 5 ist ein Rückschlagventil 7 mit einer Schließfeder 15 integriert, über welche die Öffnungskraft des Rückschlagventils 7 vorgegeben ist. Das Rückschlagventil 7 öffnet entgegen der Federkraft der Schließfeder 15 in Betankungsrichtung (siehe Pfeil 17). Beim Betanken herrscht in Betankungsrichtung stromaufwärts des Rückschlagventils 7 ein Druck P2,RSV, der zwar geringfügig kleiner als ein Betankungsdruck PT am gemeinsamen Gasanschluss 8, aber größer als ein Druck pi im Brenngastank 2 ist, wobei die Druckdifferenz eine das Rückschlagventil 7 öffnende pneumatische Kraft bewirkt, die größer als die Federkraft der Schließfeder 15 ist, so dass das Rückschlagventil 7 öffnet. A check valve 7 with a closing spring 15 is integrated into the refueling path 5, via which the opening force of the check valve 7 is predetermined. The check valve 7 opens against the spring force of the closing spring 15 in the refueling direction (see arrow 17). During refueling, a pressure P2,RSV prevails in the refueling direction upstream of the check valve 7, which is slightly lower than a refueling pressure PT at the common gas connection 8, but greater than a pressure pi in the fuel gas tank 2, the pressure difference causing a pneumatic force opening the check valve 7, which is greater than the spring force of the closing spring 15, so that the check valve 7 opens.
Um beim Betanken des Brenngastanks 2 mit Brenngas ein ungewolltes Öffnen des im Entnahmepfad 4 angeordneten Absperrventils 6 zu verhindern, weist der Betankungspfad 5 eine Querschnittsverengung 10 auf, in deren Bereich der Entnahmepfad 4 angebunden ist. Die Querschnittsverengung 10 bildet eine Venturi-Düse aus, die sicherstellt, dass im Entnahmepfad 4 in Entnahmerichtung stromabwärts des Absperrventils 4 ein Druck P2,sov herrscht, der stets kleiner als der Druck pi im Brenngastank 2 ist. Denn im Bereich der Querschnittsverengung 10 kommt es beim Betanken des Brenngastanks 2 mit Brenngas zu einer erhöhten Strömungsgeschwindigkeit, wodurch dort der statische Druck abfällt („Bernoulli-Gleichung“), so dass entsprechend der Druck P2,sov im Entnahmepfad 4 sinkt. Die Venturi-Düse verhindert somit ein ungewolltes Öff- nen des Absperrventils 4. Zur Steigerung dieses Effekts ist in Betankungsrichtung stromabwärts der Querschnittsverengung 10 ein Diffusor 11 ausgebildet, so dass der Strömungsquerschnitt im Betankungspfad 5 nicht schlagartig, sondern allmählich wieder angehoben wird. In order to prevent the shut-off valve 6 arranged in the extraction path 4 from opening accidentally when the fuel gas tank 2 is being filled with fuel gas, the refueling path 5 has a cross-sectional constriction 10, in the area of which the extraction path 4 is connected. The cross-sectional constriction 10 forms a Venturi nozzle, which ensures that in the extraction path 4 in the extraction direction downstream of the shut-off valve 4 there is a pressure P2,sov that is always lower than the pressure pi in the fuel gas tank 2. This is because in the area of the cross-sectional constriction 10, when the fuel gas tank 2 is being filled with fuel gas, there is an increased flow velocity, which causes the static pressure there to drop ("Bernoulli equation"), so that the pressure P2,sov in the extraction path 4 drops accordingly. The Venturi nozzle thus prevents the shut-off valve 6 from opening accidentally. of the shut-off valve 4. To increase this effect, a diffuser 11 is formed downstream of the cross-sectional constriction 10 in the refueling direction, so that the flow cross-section in the refueling path 5 is not increased suddenly, but gradually.
Eine erfindungsgemäße Ventilbaugruppe kann neben den dargestellten Ventilen weitere Ventile und/oder Komponenten aufweisen. Zum Beispiel kann bzw. können ein manuelles Absperr- und/oder Abblasventil, ein thermisches und/oder druckgesteuertes Sicherheitsventil sowie ein Temperatur- und/oder Drucksensor in die Ventilbaugruppe integriert sein. A valve assembly according to the invention can have additional valves and/or components in addition to the valves shown. For example, a manual shut-off and/or blow-off valve, a thermal and/or pressure-controlled safety valve and a temperature and/or pressure sensor can be integrated into the valve assembly.

Claims

Ansprüche Expectations
1. Ventilbaugruppe (1) für einen Brenngastank (2), umfassend einen Grundkörper (3), in dem ein Entnahmepfad (4) mit integriertem Absperrventil (6) zur Entnahme von Brenngas aus dem Brenngastank (2) sowie ein Betankungspfad (5) mit integriertem Rückschlagventil (7) zum Betanken des Brenngastanks (2) mit Brenngas ausgebildet sind, wobei der Entnahmepfad (4) und der Betankungspfad (5) innerhalb des Grundkörpers (3) in einem Pfad (9) zusammengeführt sind, der in einen gemeinsamen Gasanschluss (8) mündet, dadurch gekennzeichnet, dass der Übergang des Betankungspfads (5) in den Pfad (9) als Querschnittsverengung (10) ausgeführt ist und der Entnahmepfad (4) im Bereich der Querschnittsverengung (10) angebunden ist. 1. Valve assembly (1) for a fuel gas tank (2), comprising a base body (3) in which a removal path (4) with an integrated shut-off valve (6) for removing fuel gas from the fuel gas tank (2) and a refueling path (5) with an integrated check valve (7) for refueling the fuel gas tank (2) with fuel gas are formed, wherein the removal path (4) and the refueling path (5) are brought together within the base body (3) in a path (9) which opens into a common gas connection (8), characterized in that the transition of the refueling path (5) into the path (9) is designed as a cross-sectional constriction (10) and the removal path (4) is connected in the region of the cross-sectional constriction (10).
2. Ventilbaugruppe (1) nach Anspruch 1, dadurch gekennzeichnet, dass sich in Betankungsrichtung ein Diffusor (11) an die Querschnittsverengung (10) anschließt. 2. Valve assembly (1) according to claim 1, characterized in that a diffuser (11) adjoins the cross-sectional constriction (10) in the refueling direction.
3. Ventilbaugruppe (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Absperrventil (6) als elektrisch ansteuerbares und stromlos geschlossenes Ventil ausgeführt ist, das ein Ventilglied (12) aufweist, das in Richtung eines Ventilsitzes (13) von der Federkraft einer Schließfeder (14) beaufschlagt ist. 3. Valve assembly (1) according to claim 1 or 2, characterized in that the shut-off valve (6) is designed as an electrically controllable and normally closed valve which has a valve member (12) which is acted upon in the direction of a valve seat (13) by the spring force of a closing spring (14).
4. Ventilbaugruppe (1) nach Anspruch 3, dadurch gekennzeichnet, dass das in den Betankungspfad (5) integrierte Rückschlagventil (7) eine Schließfeder (15) aufweist, deren Federkraft derart ausgelegt ist, dass der Öffnungsdruck des Rückschlagventils (7) kleiner ist als der Öffnungsdruck des Absperrventils (6) in Rückwärtsrichtung. 4. Valve assembly (1) according to claim 3, characterized in that the check valve (7) integrated in the refueling path (5) has a closing spring (15) whose spring force is designed such that the opening pressure of the check valve (7) is smaller than the opening pressure of the shut-off valve (6) in the reverse direction.
5. Ventilbaugruppe (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der gemeinsame Gasanschluss (8) als Anschlussstutzen, vorzugsweise als Anschlussstutzen mit einem Außengewinde, ausgeführt ist. 5. Valve assembly (1) according to one of the preceding claims, characterized in that the common gas connection (8) is designed as a connection piece, preferably as a connection piece with an external thread.
6. Ventilbaugruppe (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Grundkörper (3) einen Verbindungsabschnitt (16) zur Verbindung mit dem Brenngastank (2) aufweist. 6. Valve assembly (1) according to one of the preceding claims, characterized in that the base body (3) has a connecting portion (16) for connection to the fuel gas tank (2).
7. Brenngastank (2) mit einer Ventilbaugruppe (1) nach einem der vorhergehenden7. Fuel gas tank (2) with a valve assembly (1) according to one of the preceding
Ansprüche, wobei vorzugsweise die Ventilbaugruppe (1) abschnittsweise in den Brenngastank (2) eingesetzt ist, so dass der gemeinsame Gasanschluss (8) von außen zugänglich ist. Claims, wherein the valve assembly (1) is preferably inserted in sections into the fuel gas tank (2) so that the common gas connection (8) is accessible from the outside.
PCT/EP2023/078008 2022-11-07 2023-10-10 Valve assembly for a fuel gas tank, fuel gas tank comprising a valve assembly WO2024099661A1 (en)

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DE102016008059A1 (en) * 2015-11-24 2017-05-24 Daimler Ag tank valve
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