EP1506936A1 - Closing device for fuel tank - Google Patents

Abstract

The road vehicle fuel tank filler cap closure plug (10) has a central bore (35) in a cylindrical body (11) with a retaining groove (33). An inwardly-directed flange (32) accommodates a spring-loaded non-return valve body (36) allowing fuel to be pumped in. The fuel flows past the valve body and through a narrow bore (40) in a cylindrical block (39) which may be screwed onto place. The fuel flows through a feed tube (45) toward the bottom of the tank A narrow bore (34) at the side of the plug receives the end of a vapor pressure equalization line (44) with its end held above the liquid level by a float (43).

Description

Field of the invention

The invention relates to a closure device for a container for liquid Fuel, which regardless of the orientation of the container pressure equalization between a gas space of the container and the outside ensures, furthermore prevents it from leaking fluid inadvertently, and also a Liquid removal allows without the closure device to be removed got to.

State of the art

Numerous fuel fluids are already at typical ambient temperatures a comparatively steep increase in the vapor pressure curve with temperature on. Thus, heating of such liquids in closed fuel containers, z. As canisters or tanks, lead to a sharp increase in pressure, either the opening of the container and a safe and regulated liquid withdrawal cause problems or lead to leaking or bursting of the container. This harbors especially in harmful, corrosive, easily inflammatory and explosive substances high risks.

In order to exclude such pressure increase, conventional container with Screw cap, such as Commercially available canisters, often stored so that the Closure is not fully tightened, so that escape vapors before an overpressure builds up. However, this is only for stationary storage possible, because during transport by the vibrations and possible orientation changes the risk of leakage of liquid exists.

There are also containers which at the top of the container wall, a pressure compensation device having a pressure relief valve, the starting from a certain internal pressure opens and allows venting. But this principle works as well then, when the pressure relief valve is adjacent to the inside of the gas space of the container, so again only for certain orientations of the containers. In case of imbalance of the container on the other hand there is a risk that liquid through the pressure compensation device escapes, or that the pressure compensation device is clogged by liquid or otherwise impaired in their functionality. Besides, it is in the Most applications impractical and / or uneconomic, simple conventional To provide or retrofit containers (canisters) with such facilities.

For removing liquid from a vertical container with opening at the top of the container, a suction pipe is immersed through the opening of the container and sucked liquid. As a rule, the opening is not sealed to to allow a subsequent flow of ambient air for the amount of liquid aspirated. However, the liquid withdrawal is also only in quiet operating conditions possible, otherwise there is a risk that liquid will escape.

Description of the invention

It is an object of the invention to provide devices which contribute to avoid the disadvantages described above.

This object is achieved by devices that during storage and transport of a Fuel tank to ensure pressure equalization, while enabling it to Remove fluid from the fuel tank.

In particular, this object is achieved by the closure device according to the invention solved with the features of the main claim.

• eine Druckausgleichsvorrichtung, die (derart ausgebildet ist, dass sie bei teilweise gefülltem Behälter) eine Fluidverbindung zwischen einem Gasraum des Behälters und dem Äußeren bereitstellt, wobei die Druckausgleichsvorrichtung eine flexible Druckausgleichsleitung mit einem Schwimmer aufweist, an dem ein Ende der flexiblen Druckausgleichsleitung derart befestigt ist, dass es in den Gasraum mündet;
• eine Flüssigkeitsdurchführung, und
• eine Flüssigkeitssaugleitungseinrichtung, die an einem Ende mit der Flüssigkeitsdurchführung kommuniziert und die an einem weiteren Ende in Flüssigkeit eingetaucht ist, wenn im Behälter Flüssigkeit vorhanden ist.

This closure device for a liquid fuel container comprises:

• a pressure equalization device (adapted to provide fluid communication between a headspace of the vessel and the exterior, when the reservoir is partially filled, the pressure equalization device having a flexible pressure equalization line with a float to which one end of the flexible pressure equalization line is attached such that it flows into the gas space;
• a fluid passage, and
• a liquid suction passage means communicating at one end with the liquid passage and which is immersed in liquid at another end when liquid is present in the container.

The pressure compensation device and the liquid feedthrough of the closure device are designed so that the two, the ventilation / liquid extraction also possible with different orientations of the liquid container is.

This is achieved by the flexible pressure equalization line and the float that the end of the flexible pressure equalization line always opens into the gas space, so that no liquid can escape via the pressure compensation device.

The (at least one) further end of the Flüssigkeitsssaugleitungseinrichtung serves as (at least one) aspirator and is in the liquid (if present in the container) immersed so that liquid in all possible container locations from the container can be sucked.

In a rigid design of Flüssigkeitsssaugleitungseinrichtung depends their Training strongly from the container shape and size for which they are used should.

It can be realized, for example, in a comparatively complicated way, that several separate rigid pipe sections to the different extremities lead the container, so that it is ensured that in any position of the Container is immersed in liquid at least one suction end, and the corresponding Aspirators are designed so that they close when not in the Liquid, but open into the gas space. Such a locking mechanism For example, an aspirating end may be connected to a valve by a float can be actuated counter to a spring force can be realized. Due to the effect of Float the float opens the valve when the suction end in the liquid immersed, while otherwise the spring action keeps the valve closed, so that the suction end is closed when it opens into the gas space.

In an alternative and particularly preferred development, the liquid suction line device an at least partially flexible fluid line which, because of its flexibility, is so oriented under its own weight, that the open suction end automatically a position near the lowest point (or the most accelerated area) occupies and thus in the liquid empties. For example, the flexible fluid conduit in the form of an elastic Spiral or screw, which is attached to one end and the open end always the lowest position.

If necessary, the flexible fluid line in the area of the suction end also be weighted with a weight.

Preferably, the flexible liquid line is in the region of the suction with connected to the float or another float such that the suction end opens below the liquid level in the liquid.

In a preferred embodiment, the closure device also comprises an operable locking device whose operation on the liquid feedthrough a fluid connection between the inside and the outside of the Container manufactures. The locking device may particularly preferably in or on the Liquid feedthrough be provided.

With this locking device can even at high levels and very violent shocks and / or particularly unfavorable container layers are ensured that liquid does not escape accidentally.

The locking device can be reversibly or irreversibly actuated, with irreversible actuatable is meant that the locking device after a single press no longer closes, but remains open.

In general, a reversible locking device is preferred, the easiest is formed by an actuatable valve. The normal state of the valve is closed, so that liquid can not escape accidentally. By operation the valve is opened, which allows a liquid withdrawal. Preferably the actuating mechanism of the valve is designed so that the Valve can not be opened unintentionally.

In particular, it is advantageous to design the actuating mechanism in such a way that he only by a specially provided connection device, which with the closure device is connectable, can be operated. For liquid withdrawal then this connection device must be connected to the closure device be, for example via a screw or a bayonet connection, wherein the connection process itself can operate the valve, or alternatively can release the opening of the valve via another separate operation.

This training prevents accidental or, you exclude brute force from, improper opening of the container and thus serves as the child safety. It can be practically realized so that instead of a single element for actuating the actuating mechanism, a plurality of punches provided are all at the same time must be operated, which only by connecting the provided on the connection device, appropriately trained counterpart is possible ("key lock principle").

A substantially reversible barrier means may be further formed by a septum be that for establishing a fluid connection through a hollow needle must be pierced and again after removing the hollow needle itself closes.

An irreversible locking device can be useful especially if the closure device is an integral part of the container and this only filled once and after the beginning of the emptying process rather than from the associated sampling system is removed until the container is completely emptied.

An example of such an irreversible locking device may be a ball that is in a tapered portion of the fluid passage is press-fitted around the conduit cross section to block, as it is e.g. as a closure for ink cartridges for Fountain pen is known.

So that the container even after opening the irreversible locking device yet can be removed from a picking device and transported, even if he is not emptied, the liquid feedthrough can also be formed be that they can be closed fluid-tight with a lid or plug, even if the locking device was once irreversibly opened.

The above statements on the operation of the components of the invention Closure device can be seen that the closure device not only the removal of liquid from a container allows, but vice versa - Without having to be removed - also filling the container with liquid.

For filling is usually conveniently the liquid feedthrough used, wherein according to the volume of liquid supplied, a gas volume can be displaced by the pressure compensation device, so it too no pressure increase in the container comes.

Under certain circumstances, but also the pressure compensation device for filling the Container to be used with liquid. It is particularly favorable in this case if at least two pressure equalization lines are provided, so that at least a pressure equalization line also used during the filling process for pressure equalization can be. Using the pressure compensation device for filling Liquid may be required when the fluid passage means (e.g., a valve) which controls the flow of fluid in one direction only, namely from the inside to the outside, allow. Using the pressure compensation device For filling liquid, for example, but also makes sense when the closure device is integral, i. non-destructively removable, Part of the container and the closure device is also an irreversible Has barrier device for the liquid feedthrough. Then you have to fill the irreversible barrier device for the liquid feedthrough is not damaged so that the container continues to be without restriction after the filling process can be transported.

The closure device according to the invention thus ensures - regardless of the position of the container - a pressure equalization between container and external atmosphere and at the same time allows a liquid removal, without the There is a risk that the fluid splashed or spilled or otherwise escape can. With proper treatment, a user can never get in touch come with the liquid.

Preferably, the closure device is designed to be in the removal opening a (conventional) liquid container can be pressed.

Thus, the pressure compensation device for circular opening cross-sections the Have the form of a cylindrical or conical or frusto-conical insert body, which is designed so that it fits accurately and sealingly in the removal opening of the liquid container can be pressed. To tolerances better To be able to compensate, the insert body or at least its peripheral area comprise an elastic material so that the contact area between the Insert body and the container opening is fluid-tight (gas and liquid-tight). For example may be one or more circular in the cylindrical peripheral region be provided circumferential recesses in which sealing rings (O-rings) used can be.

For other than circular opening cross sections, the shape of the insert body of course be adapted accordingly.

Preferably, the closure device has means for attachment to the Removal opening on that of a conventional closure for the Corresponding removal opening.

In conventional liquid containers (canisters), the removal opening in usually an external thread for attaching a screw cap (lid) on, wherein the lid is provided with a corresponding internal thread. The Closure device can be advantageous to the shape of such Be adapted to cover and such an internal thread for fastening the closure device exhibit.

If the container, however, with a cover / plug with external thread, snap closure, Bayonet lock. etc. closed, so can the closure device be trained accordingly.

In contrast to these purely mechanical methods of attaching the closure device the closure device can also in the removal opening of a Liquid container glued or welded

In a preferred embodiment, the closure device further comprises Devices facilitating the connection of an external fluid line, e.g. Means for connecting the closure device to the connection device a fluid delivery system and establishing a fluid connection between allow the closure device and the connection device.

Furthermore, the pressure compensation device preferably comprises the closure device a connection device for a vent / vent line to gases over drain the vent / vent line, e.g. to a catalytic burner or an exhaust system, so that the escaping gases / vapors not or not in the reach the atmosphere in the immediate vicinity of the container.

Especially in closed rooms and in harmful or flammable or explosive vapors should or must not vent the container the environment is done. In these cases, the vapors can be connected via a Vent line optionally to a gas outlet, directly into the open, to an absorption device (e.g., activated carbon), etc. For organic substances these vapors may preferably be passed through a catalytic burner, which transforms them into innocuous substances ("burns").

The use of a ventilation duct may be required if the inner the container must not come into contact with air, be it for reasons of purity or for safety reasons (oxygen). The ventilation line can, for example be connected to an inert gas reservoir.

The pressure compensation device can also (alternatively or additionally) a pressure relief valve so that leakage of gases / vapors does not occur continuously. So the container can be transported without permanent gases / vapors be delivered. The pressure relief valve opens only when a certain minimum pressure in the container is exceeded. Preferably, the pressure relief valve is also manually operable, allowing a user or transporter at appropriate times and perform controlled venting / venting at appropriate locations can.

To ensure that through the pressure compensation device no harmful or otherwise get dangerous vapor components out, For example, a filter (e.g., activated carbon filter) may be provided in the pressure equalization line be.

The above object is further achieved by a liquid delivery system, which is a closure device according to the invention and a connection device includes, which is connectable to the closure device to over the closure device a fluid connection between the Flüssigkeitsssaugleitung the Closure device and an external fluid line produce.

The liquid delivery system according to the invention is particularly suitable for supplying fuel to a fuel cell system operated with liquid fuel from a fuel tank (tank, canister). Thus, the liquid delivery system may for example be used particularly advantageously to methanol supply of a DMFC (D irect M ethanol F uel C ell) fuel cell system.

The liquid delivery system is not only suitable for liquid extraction, but also for filling containers with liquid.

In a particularly advantageous development, the connection device of the liquid delivery system designed such that it when connecting to the closure device the actuatable locking device of the liquid feedthrough operated, i. unlocked to provide fluid communication between the fluid space of the To provide container and the exterior of the container.

Alternatively to this easy-to-use automatic unlock when connecting Connecting device and locking device can provide increased security be achieved when the operating mechanism of the locking device so is formed by connecting the connecting device and closure device can only be unlocked (actuated), but this process must be carried out separately.

Preferably, the closure device and, depending on the training the closure device, the associated connection device further designed so that gases from the liquid container can be discharged without them on enter the environment when the connecting device with the closure device is connected or is.

For this purpose, the connecting device with a gas line for discharging be connectable to gases. Alternatively or additionally, filter devices or other gas cleaning devices integrated or connected to the connection device the connection device can be coupled to vapors leaving the container to clean and separate pollutants, and optionally a catalytic burner supply.

The above object is further achieved by a container integral with the closure device according to the invention is formed.

In this case, the integral training already in the manufacturing process of container / closure device done, with the filling of the container, as above executed, can be done via the closure device. Preferably, however separate opening provided in the container, which serves to fill the container. This separate opening can be filled with a container z. B. with a conventional Lids, plugs, etc. sealing (i.e., gas and liquid tight) are completed. In this preferred embodiment, therefore, the separate opening for filling of the container while the occlusion device is venting and venting the liquid extraction is used.

But the integral training can only after the manufacture and filling of the Container, wherein the closure device, for example, in the opening the filled container can be glued or welded to it. This training is preferred for applications where it is excluded for security reasons or as difficult as possible, that the container after emptied by the end user to be emptied.

For a better illustration of the invention, this is described below with reference to particular preferred embodiments with reference to the accompanying figure explained.

Fig. 1A:

eine perspektivische Ansicht des Hauptkörpers einer erfindungsgemäßen Verschlussvorrichtung, der als Einsatzkörper zur Anbringung in der Entnahmeöffnung eines herkömmlichen Flüssigkeitsbehälters vorgesehen ist;

Fig. 1B:

eine schematische Veranschaulichung der Anbringung des Einsatzkörper von Fig. 1A in der Entnahmeöffnung eines herkömmlichen Flüssigkeitsbehälters;

Fig. 2:

eine schematische Ausgestaltung des Hauptkörpers einer erfindungsgemäßen Verschlussvorrichtung als Aufsatz zur Anbringung an der Entnahmeöffnung eines herkömmlichen Flüssigkeitsbehälters;

Fig. 3A:

eine detailliertere, perspektivische Schnittansicht einer bevorzugten Ausführungsform der erfindungsgemäßen Verschlussvorrichtung gemäß den Prinzipien von Fig. 1A und 1B;

Fig. 3B:

eine Explosionsdarstellung des Hauptkörpers der Verschlussvorrichtung von Fig. 3A;

Fig. 4:

eine detaillierte, perspektivische Explosionsdarstellung einer Anschlussvorrichtung, die zur Verwendung in Kombination mit der in den Fig. 3A und 3B gezeigten Verschlussvorrichtung ausgebildet ist.

Fig. 5:

eine bevorzugte Ausführungsform eines Schwimmers zur Verwendung bei der erfindungsgemäßen Verschlussvorrichtung.

Show it:

Fig. 1A:

a perspective view of the main body of a closure device according to the invention, which is provided as an insert body for attachment in the removal opening of a conventional liquid container;

1B:

a schematic illustration of the attachment of the insert body of Figure 1A in the removal opening of a conventional liquid container.

Fig. 2:

a schematic embodiment of the main body of a closure device according to the invention as an attachment for attachment to the removal opening of a conventional liquid container;

Fig. 3A:

a more detailed, perspective sectional view of a preferred embodiment of the closure device according to the invention according to the principles of Figures 1A and 1B;

Fig. 3B:

an exploded view of the main body of the closure device of Fig. 3A;

4:

a detailed, exploded perspective view of a connecting device, which is designed for use in combination with the closure device shown in Figs. 3A and 3B.

Fig. 5:

a preferred embodiment of a float for use in the closure device according to the invention.

In FIGS. 1 and 2, reference numeral 50 denotes a conventional, commercial liquid container (canister) made of plastic, the removal opening 52 has an external thread for a screw cap. The invention is however not limited to such containers with screw thread.

In FIGS. 1A, 1B, 3A, and 3B, reference numeral 10 denotes the invention Closure device of which in Figures 1A and 1B, only a perspective (Fig. 1A) and schematic (Fig. 1B) view and the insert body outlined are (without fluid lines, floats, etc.). Details are made with reference to Figures 3A and 3B described.

First, Figs. 1A and 1B will be described.

Fig. 1A shows the cylindrical main body of a closure device according to the invention 10. As Fig. 1B schematically illustrates, this is a cylindrical main body as an insert body 11 for use in the removal opening 52 of the container 50 trained. At the outer edge of the upper side, the insert body 11 has a Support area 12 with a diameter slightly larger than the diameter the removal opening 52 of the container 50 is, so that the insert body 11 is not can fall into the container 50.

The cylindrical shape of the main body 11 is but even in a circular Opening cross section of the removal opening 52 of the container 50 is not mandatory. alternative For example, the main body could be frusto-conical.

The closure device 10 is in the preferred embodiment of the figures 1A, 1B, 3A, and 3B are formed so as to seal into the opening of the container 50 is pressable, so they only under considerable effort from the opening can be removed.

When such forces during transport and in the field of use of the container 50 exclude no other securing mechanism is required. If but, As shown, the closure device 10 is dimensioned to fit into the opening 52 of the container 50 is used, it is inserted with closure device 10 further possible, the conventional screw cap or a similarly trained Device (see Fig. 4) on the external thread of the container 50 to screw what used to secure the closure device 10 in the opening 52 of the container 50 can be. With the open topped, but otherwise cover-shaped device 102 4, the closure device 10 can be clamped for transport, without impairing the venting / ventilating operation of the closure device 10 becomes. The tightness against the escape of liquid can through the pressing of the seated on the removal opening of the container support area 12 of the closure device 10 can be ensured.

The external thread of the container 50 can therefore also be advantageously used to to a correspondingly formed connection device of a fluid extraction system with the container 50 and thus also with the closure device 10th connect to.

An alternative embodiment of a closure device according to the invention shows Fig. 2.

The closure device 20 of FIG. 2 is for use on the removal opening the container 50 is formed. It is in a lower section with an internal thread 21 provided corresponding to the internal thread of the conventional lid is trained. About this thread can be a solid screw between Container 50 and closure device 20 are produced.

The upper portion of the closure device 20 has an external thread 22, the For example, be formed according to the external thread of the container 50 can. This thread can be used to connect a connector Fluid extraction system with the closure device 20 to connect.

With the closure device 20 of FIG. 2, there is an extremely stable connection between Closing device 20 and container 50 possible.

FIG. 3A shows the preferred embodiment of the closure device 10 of FIG. 1A / 1B, wherein the cylindrical insert body 11 is shown in a sectional view.

As mentioned above, the upper edge of the insert body 11 has a something larger diameter than the removal opening of the liquid container to to form a Aufsitzbereich 12 and thus a seating of the closure device 10 to ensure the removal opening of the container.

To improve the lateral tightness to the removal opening, has the cylindrical Insert body 11 a circumferential groove 33, in which a sealing ring used can be, its strength depending on the exact diameter of the removal opening to choose.

The insert body 11 further includes a pressure compensation passage 34 and a Fluid passage 35 on. The pressure compensating passage 34 may further have a pressure relief valve.

The fluid passage 35 has an automatically closing valve 36, the serves as a barrier device. On the container side, the fluid passage 35 through extends a flexible liquid suction 45, which is for sucking liquid is provided.

On the container side with the pressure compensation passage 34 is a pressure equalization line 44 connected, in turn, at its free end with a float 43 such is connected, that the open free end of the pressure equalization line 44 at partial immersion of the device in a liquid in any position above the (shown lined) liquid level is.

The pressure compensation passage 34, the pressure equalization line 44 and the Float 43 thus together form the pressure compensation device of the closure device 10th

Fig. 3B shows the insert body 11 and its main components in an exploded view. These will now be described with reference to Figs. 3A and 3B.

The insert body 11 has axially a passage 35 which serves as a liquid feedthrough serves. The passage 35 has a constriction 32 at about half height on, which serves as a valve seat. The valve is connected by a valve body 36 and a Compression spring 38 is formed, which presses the valve body 36 against the constriction 36, so as to block the execution. The compression spring 38 is in a first, not supported by a continuous axial bore of a cylindrical block 39. This cylindrical Block 39 is at the container side of the axial passage 35 of the Insert body 11 pressed (possibly also glued). The cylindrical one Block 39 also has a second bore 40 of smaller diameter which is coaxial with the first hole, but is continuous as it transports fluid serves. For better sealing of the valve body 36 against the Bottom of the throat 32 of the passage 35 is further on the valve body 36 a sealing ring 37 slipped.

Another sealing ring 41 is provided on the upper side of the insert body 11. This does not affect the operation of the closure device, but the use the closure device 10 in a fluid delivery system: the sealing ring 41st ensures that a connection device 100 with the closure device 10th is fluid-tight connectable.

Fig. 4 shows an exploded perspective view of such a connection device 100, for use in combination with that shown in Figs. 3A / 3B Closure device 10 is formed.

The connection device 100 comprises a screw cap 102 for attachment of the Connecting device 100 at the removal opening of a liquid container. Of the Screw cap 102 has a recess 103 which is formed so that they over the Main body 110 of the connection device 100 can be slipped and by screwing the screw cap 102 with the external thread of the liquid container a fixed connection of connection device 100 and closure device 10 causes.

In the main body 110, a bore 115 is provided, which serves for ventilation and in the installed state with the pressure compensation passage 34 of FIG. 3A Closure device 10 shown communicates. In the bore 115 can also a tube 116 are used, on which in turn a Ent (- / Be) vent line can be connected in order not to vent gases to the environment (from the Environment), but via a gas line to a (from a) reservoir.

In the main body 110, a side port 118 is further provided, which with a axial bore in the main body 110 communicates.

The lateral port 118 serves to receive the end of a liquid extraction line 119 provided by means of a locking screw 120 fixed to the Main body 110 can be connected. In the axial bore of the main body 110, a hollow pin 111 is provided at the bottom of the main body 110 protrudes from this, and for actuating the valve 36 of the closure device 10 of Fig. 3A / 3B is used. Thus, when connecting the connecting device 100 - via the intermediate closure device 10 - with the Thread of the outlet opening of the container an outwardly sealed fluid connection between the liquid extraction line 119 and the liquid volume made in the container, sucked on the liquid from the container can be. An to the shape and diameter of the constriction 32 of the closure device 10 adapted sealing ring 112 ensures that the fluid connection, which is constructed when the two devices of Fig. 3A / 3B and Fig. 4 are used together, sealed to the outside.

Closure device 10 and connection device 100 can be dependent on each other be formed so that accidental opening of the closure device 10th is almost impossible and only using the appropriate connection device 100 allows the removal of liquid. Only with correct connection For example, a shutter mechanism (e.g., valve) in the sub-lid is opened. At removal the user's contact with the liquid is excluded. Access to the contents of the container is granted only if the corresponding consumer on the correct removal device is connected.

By floating on the liquid surface float 43 is ensured that a ventilation / venting line 44 in any position of the container opens into the gas phase above the liquid surface.

The line 45 for the liquid extraction can be used in combination with the Float 43 (or another float) can be used and so with the Float 43 (or the other float) connected to the suction end always flows into the liquid at the bottom of the float.

The lines can be guided through holes in the float 43, as for the line 44 is outlined in FIG. 3A. But you can also in other ways and Be connected to the swimmer.

Fig. 5 illustrates how a float 43, for example, by a hollow plastic ball 70 may be formed, with the outside of the line 44 via a Heat shrink tube 90 is connected. To make sure the open end of the Line 44 always opens into the gas phase, a weight 80 may further provided be that stabilized the position of the float 43.

In particularly critical applications, the venting (rather than to the environment) controlled by, for example, a filter (e.g. or catalytic burner can be installed in the ventilation / vent line can. This allows emissions from the container into the environment (e.g. of solvent containing containers) and environmental contaminants in to prevent the container.

Claims (16)

A closure device (10) for a liquid fuel container (50), comprising: a pressure equalization device providing fluid communication between a headspace of the container (50) and the exterior, the pressure equalization device including a flexible pressure equalization line (44) having a float (43) to which one end of the flexible pressure equalization line (44) is attached that it flows into the gas space; a fluid passage (35), and a liquid suction line (45) which communicates at one end with the liquid passage (35) and which is immersed in liquid at another end when liquid is present in the container. The device (10) of claim 1, further comprising: an actuatable locking device (36), the actuation of which via the fluid passage (35) establishes a fluid connection between the interior and the exterior of the container (50). Apparatus (10) according to claim 2, wherein an actuating mechanism the actuatable locking device (36) is designed so that it only by a specially provided connection device, which with the closure device is connectable, is operable. Device (10) according to claim 2 or 3, wherein the locking device of the Liquid passage comprises an actuatable valve. Device (10) according to one of the preceding claims, wherein the Liquid line (45) is at least partially flexible. Device (10) according to claim 5, wherein the other end of the flexible Liquid line (45) is weighted with at least one weight. Device (10) according to one of claims 5 or 6, wherein the further End of the flexible fluid line (45) with the float (43) or one another float is connected. Device (10) according to one of the preceding claims, which is so is formed, that in the removal opening (52) of the liquid container (50) is einpressbar. Device (20) according to one of the preceding claims, which devices (21) for attachment to the removal opening (52), the the means (11) of a conventional closure for the removal opening (52). Device according to one of the preceding claims, comprising: a connection device for an external fluid line. Device according to one of the preceding claims, comprising: a connection device for a vent / vent line. Device according to one of the preceding claims, in which the Pressure equalization device comprises a pressure relief valve. Liquid delivery system, in particular for supplying fuel to a fuel cell system, comprising: a closure device (10) according to one of the preceding claims, a connection device (100) which is connectable to the closure device (10) in order to establish a fluid connection between the liquid suction line (45) of the closure device (10) and an external liquid line (119) via the closure device (10). A liquid delivery system according to claim 13, wherein the connection device (100) is formed such that it when connecting to the closure device (10) the actuatable barrier device (36) of the liquid feedthrough actuated (35) to provide fluid communication between the fluid space of the container and the exterior of the container (50). A liquid delivery system according to claim 13 or 14, wherein the Connecting device (100) is designed so that gases from the Liquid containers (50) are dischargeable, without them to the environment arrive when the connecting device (100) with the closure device (10) is connected. Container with a closure device (10) according to one of claims 1 until 12.

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