EP4211054A1

EP4211054A1 - Outlet valve for an infusion container, and infusion container

Info

Publication number: EP4211054A1
Application number: EP21773329.4A
Authority: EP
Inventors: Theodor Wüst; Franco Del Bon; Joseph Alain Scherrer
Original assignee: Swiss Tea Innovation Ag
Current assignee: Swiss Tea Innovation Ag
Priority date: 2020-09-10
Filing date: 2021-09-02
Publication date: 2023-07-19
Also published as: CH717836A9; US20240051737A1; JP2023541905A; CH717836A2; WO2022053394A1; CN116194389A; CA3192166A1; KR20230066024A

Abstract

The invention relates to an outlet valve (30) for an infusion container (20) for receiving a dried infusion substance, and to an infusion container. The outlet valve (30) has a valve body (32) and a closure (31). The closure (31) is movable relative to the valve body (32) in an axial direction from a first position to a second position.

Description

Outlet valve for an infusion container and infusion container

The present invention relates to an outlet valve for an infusion container and an infusion container comprising an outlet valve according to the preamble of the independent claims.

In the context of the present invention, an infusion beverage is understood to mean any type of beverage that can be prepared from an infusion dry substance by contacting it with a cold or hot infusion liquid. A typical infusion drink is, for example, tea, which is prepared by brewing tea leaves or herbs with hot water.

It is known that different types of tea require a comparatively long brewing time of a few minutes in order for their aroma to develop optimally. The contact time between the tea leaves and the brewing water must therefore be sufficiently long.

With EP 3 119 245 B1, a tea preparation device and a method have become known which make it possible to bring a measured quantity of an infusion dry substance into contact with an infusion liquid over a specific contacting period. This is made possible by an expandable infusion container. In order to bring the infusion liquid into the container, a cover of this container is pierced with a filling needle and the infusion liquid is introduced into the container through this filling needle. To empty the infusion container, an outlet valve is provided, which opens when an overpressure inside the infusion container is exceeded. The overpressure is achieved by compressing the container with a squeezing piston.

This process cannot be reliably reproduced. Depending on the spout dry matter, the infusion container is more or less bulging. By the pressure of the ejection piston opened earlier when the container was full than when it was low. Due to fluctuations in production, not all outlet valves are identical and therefore do not open at exactly the same pressure.

It is the object of the invention to remedy at least one or more disadvantages of the prior art. In particular, an outlet valve for an infusion container is to be provided which enables safe, simple and, in particular, reproducible operation.

This object is achieved by the devices defined in the independent patent claims. Further embodiments emerge from the dependent patent claims

An outlet valve according to the invention for an infusion container for receiving an infusion dry substance has a valve body and a closure. The closure is movable relative to the valve body in an axial direction from a first position to a second position.

The axial direction is essentially defined by the flow direction. In the case of, for example, rotationally symmetrical outlet valves and/or infusion containers, there is a central axis which essentially coincides with the direction of flow. A central axis is also present in non-rotationally symmetrical configurations of the infusion container.

This is essentially defined by the connection of an inlet valve and the outlet valve. A direction of flow, which runs from the inlet valve to the outlet valve, is also defined by the inlet valve and the outlet valve.

The relative mobility of the closure enables the outlet valve to be opened easily and, in particular, independently of the pressure. In addition, an outlet opening in relation to the Infusion containers are spaced apart, which enables the infusion drink to be dispensed without making a mess.

The outlet valve closes a dispensing opening of the infusion container.

It can be provided that a sealing element, in particular a sealing lip, is arranged on the closure for sealing between the valve body and the closure.

The outlet valve can be reliably closed by a sealing lip . Unintentional dispensing of an infusion beverage can be prevented, as can penetration of, for example, moisture or dirt into the interior of the infusion container.

The valve body can have a hollow cylindrical wall. The sealing element is arranged within this wall and, in the first position of the closure, lies against an inner surface of this wall.

An essentially homogeneous surface on which the sealing element comes to rest can be provided by an inner surface on the wall. Due to the hollow-cylindrical design of the wall, the inner surface is also essentially cylindrical. The axial position of the sealing element is therefore not sensitive to tolerances.

In addition, this design enables simple production and the use of standard parts for the sealing element, such as O-rings.

The closure can also have a hollow-cylindrical wall. To guide the closure, this rests against an outer surface of the wall of the valve body. In other words, the wall of the valve body becomes a guide element provided on which the hollow-cylindrical wall of the closure can slide and/or be guided.

This enables the individual elements to be guided in a simple and uncomplicated manner, with this guide being available with little effort and low production costs.

It can be provided that a thread is arranged on the hollow-cylindrical wall of the closure. This is in engagement with a thread on the outer surface of the wall of the valve body.

In this case, by definition, the threads are an integral part of the respective walls.

By providing threads on the one hand on the outer surface of the wall of the valve body and on the other hand within the hollow cylindrical wall of the closure, the closure can be moved axially relative to the valve body by rotating the valve body. In other words, a rotary movement of the valve body results overall in an axial displacement of the valve body.

The axial displacement of the closure can thus be implemented by simple, mechanical actuation elements.

For example, a radially protruding extension can be arranged on the closure, which can be actuated with an actuating lever.

It is also conceivable that a toothing is arranged on the periphery of the closure, which co-operates with a corresponding counter-toothing on a device for preparing an infused beverage. In other words, a gear can be arranged on this device, which engages in the teeth on the closure. By simply turning this gear wheel, the closure can be turned on the thread and thus be shifted overall in the axial direction, so that a dispensing opening of the infusion container is released.

The thread also ensures that in the event of an unexpected overpressure within the infusion container, the outlet valve reliably prevents independent or unintentional opening.

Passage openings can be arranged on the closure, which are arranged between the sealing element and the hollow-cylindrical wall. These passage openings can be realized, for example, by providing webs between the hollow-cylindrical wall of the closure and the sealing element.

This enables the infusion beverage to flow out easily from the infusion container while the closure is guided on the valve body at the same time.

The outlet valve, in particular the closure and/or the valve body, can be manufactured from plastic, in particular from a biodegradable plastic, preferably from a bio-based plastic, in an injection molding process.

In a supplementary or alternative variant, it can be provided that the closure is designed to be elastically deformable. In this embodiment, the valve body also has a hollow-cylindrical wall, but the sealing element rests against an outer surface of this wall in the first position of the closure.

The provision of an elastically deformable closure makes it possible to dispense with a separate sealing element, since the closure can assume a sealing function due to the elasticity of the closure. In addition, the elastic deformability makes it possible for the closure to be arranged on the inside in the infusion container, in particular set back towards the bottom part.

This arrangement enables the infusion containers to be stacked easily.

Since the closure can also be moved axially from a first position into a second position, its end, which provides an outlet opening, can be moved out of the base part by the deformation, which enables the infused beverage to be dispensed cleanly and free of spills .

In this embodiment variant, the closure can be made from a flexible plastic, in particular from a biodegradable plastic, preferably from a bio-based plastic.

Thin areas of material can be arranged on the closure, which provide passage openings after they have been broken open.

Such a configuration allows a closure to be provided which does not require any further elements for sealing and which is completely tight before use, that is to say can completely seal off the interior of an infusion container from the environment.

This also allows the closure to be manufactured in one piece, which reduces the manufacturing costs.

The material thin point can be designed as a tear-off film. A tear-off film is a point in the material with a small height or thickness in relation to the width. The material thin point is typically thicker than 10 μm and preferably does not exceed a thickness of 500 μm. In particular, it is at most half as thick as an adjoining wall. It is conceivable that the closure is essentially tubular, with part of the tube being turned inside out. The closure is preferably in the area of the inversion on the hollow-cylindrical wall of the valve body or on the outer surface of this wall, at . This area thus forms the sealing element.

At the end of the closure, a membrane closing the closure can be arranged, in which the material thin points are formed.

A further aspect relates to an infusion container for receiving an infusion dry substance for the preparation of an infusion beverage. The infusion container comprises a base part, a cover part and a wall part connecting the base part and the cover part. The infusion container also includes an outlet valve as described here. The outlet valve is located in the bottom part.

The arrangement of the outlet valve in the base part makes it possible to provide a base part which no longer has to be additionally configured and/or processed later in the course of production.

The infusion container is preferably expandable, with the wall part in particular having a variable length.

On the one hand, this allows the infusion dry substance in the infusion container to swell, and on the other hand, the infusion container can be transported and stored before use with little space requirement.

With the exception of the outlet valve described here, the infusion container can be designed in particular in accordance with the infusion container that is described and claimed in EP 3 119 245 B1. The infusion container is thus liquid-tight, in particular for receiving an infusion liquid designed and configured to be expanded from a collapsed shape to an expanded shape by introduction of infusion liquid. As an alternative to this embodiment, it can also be designed with an inlet valve. The pouring container is therefore no longer pierced for filling, but is filled through the inlet valve.

The infusion container described here is particularly suitable for carrying out the method which is described and claimed in EP 3 119 245 B1. The method is, in particular, a method in which a measured quantity of an infusion dry substance is brought into contact with a measured quantity of an infusion liquid and the infusion beverage is thereby formed. The infusion solids are provided in the infusion container, which is initially in a collapsed configuration and expandable into an expanded configuration. The infusion liquid is poured into the infusion container . The infusion container is expanded so that the infusion solids in the infusion container are held in contact with the infusion liquid for a contacting period to form the infusion beverage. The infusion container is then at least partially returned to its collapsed shape by being pressed together, and the infusion beverage is at least partially expelled from the infusion container.

The outlet valve is preferably opened by moving the closure relative to the valve body before the squeezing or by the squeezing of the infusion container.

The valve body can be designed as an integral part of the base part.

This makes production easier and cheaper and reduces the number of interfaces that have to be provided on the base part. A filter sieve can be arranged at the dispensing opening of the infusion container. The hollow-cylindrical wall of the valve body can be formed in connection with the filter screen.

This makes it possible to provide the hollow-cylindrical wall as an integral part of the filter screen. In addition, the hollow-cylindrical wall can be arranged in line with a wall of the filter screen, which in turn enables simple production. This arrangement can also create favorable flow conditions for the infusion beverage to emerge.

In addition, the filter sieve prevents the infusion dry substance from being dispensed from the infusion container together with the infusion beverage.

Alternatively it can be provided that the filter screen is arranged at the dispensing opening of the infusion container and the hollow-cylindrical wall is formed inside the filter screen.

In particular when the closure is designed as an elastically deformable element, this makes it possible for it to rest against this hollow-cylindrical wall within the filter sieve and thus seal the interior of the infusion container from its surroundings.

The invention is explained in detail below with the aid of several exemplary embodiments on the basis of schematic figures. It shows :

FIG. 1: A perspective sectional view of an infusion container;

FIG. 2A: a perspective view of the infusion container from FIG. 1 in a collapsed form; FIG. 2B: a perspective view of the infusion container of FIG. 2A in an expanded form;

FIG. 3: a detailed view of the outlet valve from FIG. 1;

FIG. 4: the detailed view from FIG. 3 with the open

Outlet valve;

FIG. 5: an alternative outlet valve in a representation according to FIG. 3;

FIG. 6: a detailed view from FIG. 5 with the open

Outlet valve;

FIG. 7: an alternative outlet valve in a representation according to FIG. 3;

FIG. 8: a detailed view from FIG. 7 with the open

Outlet valve;

FIG. 9: a perspective view of an infusion container with an alternative outlet valve in a representation according to FIG. 1;

FIG. 10: a detailed view from FIG. 9;

FIG. 11: a further detailed view from FIG. 9;

FIG. 12: the view according to FIG. 11 with the open

Outlet valve;

FIG. 13: the view according to FIG. 10 with the open

Outlet valve;

Figure 14: A detailed view of an alternative embodiment of the outlet valve according to Figure 9. For the sake of better clarity, any dry substance that may be present in the infusion container 20 is not shown in any of the figures.

FIG. 1 shows a perspective sectional view of an infusion container 20 . The infusion container 20 has an inlet valve 10 and an outlet valve 30 with a dispensing opening 212 . The infusion container itself comprises a base part 21 , a cover part 22 and a wall part 23 . The wall part 23 is expandable and in the present case is in the form of a bellows and is made from a flexible plastic. The wall part 23 is connected to the bottom part 21 in a liquid-tight manner on the one hand and to the cover part 22 in a liquid-tight manner on the other hand. This wall part 23 is surrounded by the base part 21 and the cover part 22 . For this purpose, a wall extending in the direction of the cover part 22 is provided on the base part 21 at its periphery. As can be seen in FIG. 1, the inlet valve 10 is designed as an integral part of the cover part 22 . It can also be seen that the outlet valve 30 is at least partially designed as an integral part of the base part 21 . A filter screen 213 positioned upstream of a dispensing opening 212 is also illustrated.

The infusion container 20 according to FIG. 1 is of essentially rotationally symmetrical design and has a central axis L. This also defines an axial direction. A central axis is also present in non-rotationally symmetrical configurations of the infusion container 20 . This is essentially defined by the connection of inlet valve 10 and outlet valve 30 . A flow direction, which runs from the inlet valve 10 to the outlet valve 30, is also defined by the inlet valve 10 and the outlet valve 30.

FIG. 2A shows a perspective view of the infusion container 20 from FIG. 1 in a collapsed form. How out As can be seen from FIG. 2A and from FIG. 1, in the collapsed form the base part 21 is connected to the cover part 22 via the wall arranged on its periphery with corresponding breaking-open elements.

FIG. 2B shows a perspective view of the infusion container from FIG. 2A in an expanded form. By introducing an overpressure via the inlet valve 10 (see FIG. 1), the rupturing elements of the wall of the base part 21 were broken open and the wall part 23 expanded by filling the infusion liquid into the infusion container 20 . It goes without saying that the inlet valve 10 was opened before the overpressure was introduced. The infusion container 20 then remains in this expanded form for a predetermined time and is then compressed to dispense the infused beverage. It goes without saying that, as explained below with reference to the other figures and 4, the outlet valve 30 (see FIG. 1) is opened in particular before the compression and the infused beverage is dispensed through this outlet valve 30 .

FIG. 3 shows a detailed view of the outlet valve 30 from FIG. The outlet valve 30 has a closure 31 and a valve body 32 . In the present case, the valve body 32 is designed as an integral part of the base part 21 . The valve body 32 has a hollow-cylindrical wall 321 which extends away from the bottom part 21 . In other words, the hollow-cylindrical wall 321 extends in the direction of flow. This hollow-cylindrical wall 321 has an outer surface 322 and an inner surface 323 .

The closure 31 has a hollow-cylindrical wall 312 and a sealing element 311 arranged centrally in this wall 312 . The sealing element 311 is an integral part of a cap 316 with webs 317 with the hollow cylindrical wall 312 is connected. Passage openings 313 are located between these webs. The sealing element 311 and the hollow-cylindrical wall 321 are presented in such a way that these two components overlap. In reality, however, the sealing element 311 and/or the wall is correspondingly deformed. This applies to all representations of all embodiments.

In the illustration according to FIG. 3, the outlet valve 30 is closed. The sealing element 311 rests on the inner surface 323 of the hollow-cylindrical wall 321 of the valve body 32 . As a result, the interior of the infusion container 20 is sealed off from its surroundings.

An inner surface 315 of the hollow cylindrical wall 312 of the closure 31 rests on the outer surface 322 of the hollow cylindrical wall 321 . The closure 31 is guided on the valve body 32 by the contact between these two surfaces or walls.

FIG. 3 also shows the filter sieve 213 which is arranged on the dispensing opening 212 . All liquid exiting through the dispensing opening 212 must first pass through the filter screen 213 .

The discharge opening 212 is closed by the outlet valve 30 .

FIG. 4 shows the detailed view from FIG. 3 with the outlet valve 30 open. As can be seen from the representation according to FIG. 4, the closure 31 was moved in the axial direction along the axis L (see FIG. 1). Here, the sealing element 311 was pulled from the inner surface 323, so that between the sealing element 311 and the hollow-cylindrical wall 321 of the valve body 32, a substantially annular gap was created, through which the infusion drink from the Infusion container can be issued. The infused beverage then flows through the passage openings 313 and emerges from the outlet valve at the lower end of the outlet valve in this illustration, ie at an outlet opening.

To move the closure 31 relative to the valve body along the axial direction from the first position (see FIG. 3) to the second position shown, it was pulled in the appropriate direction using a suitable device, for example a clamp.

FIG. 5 shows an alternative intake valve 30 in a representation according to FIG. The outlet valve 30 has a closure 31 and a valve body 32 . In the present case, the valve body 32 is designed as an integral part of the base part 21 . The valve body 32 has a hollow-cylindrical wall 321 which extends away from the bottom part 21 . In other words, the hollow-cylindrical wall 321 extends in the flow direction. This hollow-cylindrical wall 321 has an inner surface 323 and an outer surface 322 . An unspecified thread is formed on the outer surface 323 as an integral part of the hollow-cylindrical wall 321 .

The closure 31 has a hollow-cylindrical wall 312 and a sealing element 311 arranged centrally in this wall 312 . The sealing element 311 is an integral part of a cap 316 which is connected to the hollow-cylindrical wall 312 by webs 317 . Passage openings 313 are located between these webs. The hollow-cylindrical wall 312 has an inner surface 315 and an outer surface, not designated in any more detail. An unspecified thread is formed on the inner surface 315 as an integral part of the hollow-cylindrical wall 312 . This thread is in engagement with the thread of the valve body 32 . On the outer surface of Hollow cylindrical wall 312 teeth are formed so that the outer surface assumes the shape of a gear and forms a toothing. The closure 31 can be moved via this gear wheel with a means suitable for this purpose, for example also a gear wheel in the present case. As a result, the closure 31 with the thread can be moved in the axial direction from a first position shown here into a second position shown in FIG.

The arrangement of the sealing element 311 on the inner surface 323 and the arrangement of the filter screen 213 and the dispensing opening 212 corresponds to those arrangements which have been described with reference to FIGS. Correspondingly, reference is made to the text passages associated with these figures.

FIG. 6 shows the detailed view from FIG. 5 with the outlet valve 30 open. As can be seen from the representation according to FIG. 6, the closure 31 was moved in the axial direction along the axis L (see FIG. 1). The sealing element 311 was pulled from the inner surface 323 so that a substantially annular gap was formed between the sealing element 311 and the hollow-cylindrical wall 321 of the valve body 32, through which the infused beverage can be dispensed from the infusion container. The infusion drink then flows through the passage openings 313 .

In order to open the outlet valve, the closure was turned with a gear wheel, not shown here, which is in engagement with the toothing of the closure, and moved accordingly on the thread. The closure 31 was thus moved in the axial direction by the rotation on the thread.

FIG. 7 shows an alternative outlet valve in a representation according to FIG. The outlet valve 30 has a closure 31 and a valve body 32 . The valve body 32 has a hollow cylindrical wall 321 . The valve body 32 is arranged in its entirety within a filter sieve 213 and in the present case set back into the interior of the infusion container in relation to a base part 21 of the infusion container 20 . The filter screen 213 encloses a dispensing opening 212 . Arranged in the dispensing opening 212 is a closure 31 which is elastic in the present case. The closure 31 has an overall tubular design with a hollow-cylindrical wall 312 and is about half turned inside out. The closure 31 has an end pointing downwards in the present FIG. 7, which is closed with a membrane in which thin material areas 314 are arranged. This end forms the outlet opening.

In the region of the inversion, the closure 31 rests with an inner surface 315 of the hollow-cylindrical wall 312 on an outer surface 322 of the hollow-cylindrical wall 321 of the valve body 32 . This inversion provides the sealing element 311 which rests on the outer surface 322 of the hollow-cylindrical wall 321 . This isolates the interior of the infusion container 20 from its surroundings. The dispensing opening 212 is thus closed.

FIG. 8 shows the detailed view of the outlet valve 30 of FIG. 7 with the outlet valve 30 in an open representation. In order to open the outlet valve 30, ie to move it from the first position shown in FIG. 7 relative to the valve body 32 into the position shown in this figure, pressure was applied within the infusion container 20. The elastic closure 31 was deformed by this pressure, so that the end of the closure 31 moves in the direction of flow and releases an essentially annular gap between the hollow-cylindrical wall 321 of the valve body 32 and the inner surface 315 of the hollow-cylindrical wall 312 of the closure 31 . A further build-up of pressure within the Infusion container, the thin points 214 can be broken up so that the infusion beverage can flow out of the infusion container 20.

By prestressing the closure 31, it springs back into its original position after the pressure within the infusion container 20 has dropped and thus closes the infusion container again. Subsequent dripping of the infusion container can thus be prevented.

FIG. 9 shows a perspective sectional view of an infusion container 20 with an alternative outlet valve 30 . The infusion container 20 is designed essentially analogously to the infusion container 30 from FIG. The infusion container itself comprises a base part 21 on which a closure 31 of the outlet valve 30 is arranged. The closure 31 spans the bottom part 21 completely. A closure body 32 is formed centrally and as an integral part of the base part 21 . A wall extending in the direction of the cover part 22 (see also FIG. 1) is provided on the periphery of the base part 21 . A filter screen 213 positioned upstream of a dispensing opening 212 is also illustrated.

FIG. 10 shows a detailed view from FIG. The central part of the outlet valve 30 is shown. The outlet valve 30 has a closure 31 and a valve body 32 . The valve body 32 has a first hollow-cylindrical wall 321 and a second hollow-cylindrical wall 321'. The first hollow-cylindrical wall 321 and the second hollow-cylindrical wall 321' are arranged essentially concentrically to one another. A hollow-cylindrical wall 312 of the closure 31 is arranged between these two walls 321 and 321 ′. The hollow-cylindrical wall 312 of the closure 31 has an inner surface 315 which is in contact with a corresponding outer surface 322 of the hollow-cylindrical wall 321 . In between A sealing element 311 is arranged on these two surfaces. The hollow-cylindrical wall 312 also has an unspecified outer surface which is in contact with a corresponding inner surface of the second hollow-cylindrical wall 321 ′ of the valve body 32 . A further sealing element 311 ′ is arranged between these two walls. The closure 31 is sealed off from the valve body 32 by the sealing elements 311 and 311', and thus the interior of the infusion container 20 is sealed off from its surroundings.

FIG. 11 shows a further detailed view from FIG. 9, the peripheral elements of the closure 30 being illustrated in this view. As already explained, the closure 31 spans the base part 21 up to its periphery. Correspondingly, there is a wall extending in the direction of the inlet valve (see FIG. 1) on the periphery of the closure 31 . A projection 319 is formed on this wall and engages in a corresponding depression in the wall of the bottom part 21 . A shoulder 216 is also arranged in this recess. As can be seen from FIG. 11, the projection 319 and the shoulder 216 are arranged at a distance from one another in such a way that the closure 31 can be moved in an axial direction. In order to move the closure 31 in the axial direction, a notch 318 is provided on its circumference, into which a corresponding actuating mechanism, for example a device for brewing tea, can engage.

FIG. 12 shows the view according to FIG. 11 with the outlet valve 30 open. In order to open the outlet valve 30, the closure 31 was moved in an axial direction until the projection 319 of the closure 31 comes into abutment with the shoulder 216 of the base part 21. The closure 31 has therefore undergone a defined axial displacement. Correspondingly, FIG. 13 shows the view according to FIG. 10 with the outlet valve 30 open. The central part of the closure 31 was also moved axially by the axial movement described for FIG. The hollow-cylindrical wall 312 was correspondingly displaced axially along the wall 321 ′ and the wall 321 . As can be seen from FIG. 13, in this position the sealing element 311 is externally engaged with the hollow-cylindrical wall 312 of the closure, but the sealing element 311' is still in contact with the second hollow-cylindrical wall 321' of the valve body 32. In other words, only in the area of the sealing element 311 is an essentially annular through-opening created, through which the infused beverage can flow out.

FIG. 14 shows a detailed view of an alternative embodiment of the outlet valve 30 according to FIG. In contrast to the embodiment from FIG. 9, no notch is provided on the periphery of the closure 31, but rather teeth. The teeth are arranged on a wall extending in the direction of the inlet valve (see FIG. 1). This wall has a thread on its inside which engages with a corresponding thread on the periphery of the bottom part 21 . The outlet valve 30 is then opened analogously to the outlet valve 30 according to the exemplary embodiment from FIGS. The seal between an interior of the infusion container 20 and its surroundings is designed analogously to the exemplary embodiment according to FIGS. 9 to 13.

It goes without saying that in all of the embodiments and/or methods described here, the infusion beverage has lingered within the expanded infusion container 20 for a predetermined period of time before the outlet valve 30 is opened in each case.

Claims

patent claims

1. Outlet valve (30) for an infusion container (20) for receiving an infusion dry substance, characterized in that the outlet valve (30) has a valve body (32) and a closure (31), the closure (31) re - Relative to the valve body (32) is movable in an axial direction from a first position to a second position.

2. Outlet valve (30) according to claim 1, characterized in that a sealing element (311), in particular a sealing lip, is arranged on the closure (31) for sealing between the valve body (32) and the closure (31).

3. Outlet valve (30) according to claim 1 or 2, characterized in that the valve body (32) has a hollow cylindrical wall (321) and the sealing element (311) is arranged within this wall (321) and in the first - th position of the closure (31) on an inner surface (323) of this wall (321).

4. Outlet valve (30) according to claim 3, characterized in that the closure (31) has a hollow-cylindrical wall (312) for guiding the closure (31) on an outer surface (322) of the wall (321) of the valve body (32) applied.

5. Outlet valve (30) according to claim 4, characterized in that a thread is arranged on the hollow-cylindrical wall (312) of the closure, which thread engages with a thread on the outer surface (322) of the wall (321) of the valve body (32) is.

6. Outlet valve (30) according to claim 4 or 5, characterized in that passage openings (313) are arranged on the closure (31) between the sealing element (311) and the wooden-cylindrical wall (312).

7. Outlet valve (30) according to Claim 1 or 2, characterized in that the valve body (32) has a hollow-cylindrical wall (321) and the sealing element (311) in the first position of the closure (31) on an outer surface (322 ) of this wall (321) abuts, in particular the closure (31) is designed to be elastically deformable.

8. Outlet valve (30) according to claim 7, characterized in that thin material areas (314) are arranged on the closure (31), which provide passage openings (313) after they have been broken open.

9. Infusion container (20) for receiving an infusion dry substance for the preparation of an infusion beverage, comprising a base part (21), a cover part (22) and a wall part (23) connecting the base part (21) and the cover part (22) and an outlet valve (30) according to any one of the preceding claims, characterized in that the outlet valve (30) is formed in the base part (22).

10. Infusion container (20) according to claim 9, characterized in that the infusion container (20) is expandable, with the wall part (23) in particular having a variable length.

11. infusion container (20) according to any one of claims 9 or 10, characterized in that the valve body (32) is designed as an integral part of the base part (21).

12. Infusion container (20) according to one of Claims 9 to 11, characterized in that a filter sieve (213) is arranged at a dispensing opening (212) of the infusion container (20) and the hollow-cylindrical wall (321) adjoining the filter sieve (213 ) is trained.

13. Infusion container (20) according to any one of claims 9 to 11, characterized in that at a dispensing opening (212) of the infusion container (20) a filter screen (213) is arranged and the hollow cylindrical wall (321) is formed within the filter screen (213).