EP3736225B1 - Closure device and fluid container - Google Patents

Description

The present invention relates to a closure device for closing a liquid bag. The present invention further relates to a liquid container with a liquid bag and a closure device.

In so-called bag-in-box packaging, a liquid is packed in a liquid bag, which is usually made of a film composite material (e.g. aluminum/HDPE or polyethylene). This liquid bag is then placed in an outer packaging, such as a cardboard box or a wooden box. The liquid is removed using a removal device, which can be designed as a tap for manual removal of the liquid, for example. Another area of application for liquid bags is in the area of automated beverage dispensers. For example, in soft drinks (cola, lemonade, etc.), a syrup is mixed with water and carbon dioxide so that it can be removed in drinkable form. The syrup is usually provided in a liquid bag.

The liquid bags must have an opening for filling and removing liquid. The opening is closed with a closure device that allows the liquid bag to be closed after filling and opened for removal. Previous approaches have mostly used a closure device with an open lower part welded to the liquid bag and an upper part that can be joined to the lower part. After filling through the lower part, the upper part is joined to the lower part and the liquid bag is thus closed.

However, this use of two-part closure devices has various disadvantages. On the one hand, sterilization or disinfection of the closure device during the filling process is complex. On the other hand, the production of a two-part closure device is comparatively complex and expensive, not least because of the higher material requirements. In addition, filling through the lower part and then joining it with the upper part is comparatively labor-intensive.

In order to improve the previous approach of using two-part closure devices, the EN 10 2015 014 372 A1 a closure with a flange component closure bung is disclosed. The disclosed closure is provided with a fastening flange, as previously had the usual bung. Portals on the closure fulfill the filling options that a bunghole has previously provided. A closure is no longer removed from a bung in order to fill a container, but rather a filling material is introduced into the container via portals through the closure itself, which enables a closed filling and removal system.

US 2013/0292592 A1 relates to a device for connecting and filling and a method. A valve comprises a housing, a flexible valve element sealingly mounted in the housing, and a valve body mounted on the flexible valve element in the housing. The flexible element is movable between a closed and an open Position movable to permit the flow of fluid. The valve is engageable with a filling device having flow openings and a surrounding closure. The closure and/or the stem is movable between (i) a first position in which the closure closes the opening(s) and (ii) a second position in which the opening(s) is/are open. Alternatively, the valve may comprise part of a female port and the filling device may comprise part of a male port to form an aseptic fluid port for the aseptic transfer of fluid therethrough.

EP 3 042 861 A1 relates to a check valve, a check valve assembly, and a container. The check valve includes a pouring member having a flow path therein and one end of the flow path opening as a pouring opening of a vessel. The check valve further includes an outer end portion, a pressing member having a base end portion supported by an inner end portion of the pouring member, a valve body connected to a tip end portion of the pressing member, and a cylindrical member having a flow path therein and provided with a valve seat portion. The pouring member is fixedly attached to the cylindrical member at an inner peripheral surface so that the valve body and the pressing member are inserted into the cylindrical member and the valve body is pressed toward the valve seat portion by the pressing member.

US 5 899 624 A relates to a fluid dispensing valve used for printing and marking, comprising a valve body having an end wall defining an opening, and a spring-loaded valve element disposed within the valve body to open and close the opening. A spring element is connected to the tubular body adjacent the circular wall, the spring element and the wall forming a chamber for receiving a fluid metered through the opening of the valve body when the opening is opened. The spring element has at least one opening communicating with the chamber.

A porous member is attached to the spring member so as to cover the opening in the spring member. The porous member transfers the liquid received in the chamber to a surface in the form of a geometric print image. In operation, a compressive force applied to the porous member causes the spring member to compress and engage the portion of the valve member, thereby partially forcing a portion of the valve member back through the opening in the open position to permit the passage of a marking liquid into the chamber and to wet the porous member. The porous member has a predetermined stiffness which substantially prevents the porous member from deforming from its predetermined geometric shape under the compressive force. The liquid dispensing valve is typically attached to the open end of a container containing the liquid to be dispensed. A removable cap is provided to cover the valve when not in use.

A previously neglected area of application for liquid bags is the packaging of carbonated drinks. This usually requires counter-pressure filling. A pressurized container is filled with liquid while a gas (usually CO ₂ ) in the container is released at the same time. Counter-pressure filling prevents the carbonated liquid from foaming. Previous closure devices for liquid bags are not suitable for this type of counter-pressure filling due to their design.

Based on this, the present invention has the task of providing a closure device that can also be used in counter-pressure filling. In particular, a closure device is to be created that enables efficient, automated counter-pressure filling so that carbonated liquids can be packaged in liquid bags. In addition, efficient manufacturability, good disinfectability and sufficient stability against higher pressure should be ensured. For example, a pressure of up to approx. 10 bar can occur if the liquid in the bag is shaken or heated.

• einem einstückig ausgebildeten Grundkörper umfassend einen ebenen Flanschrand zum Verbinden des Grundkörpers mit dem Flüssigkeitsbeutel und einen Portalaufbau mit einem Hauptabschnitt, einem ersten Ventilabschnitt und einem zweiten Ventilabschnitt, wobei der erste Ventilabschnitt eine von außen zugängliche erste Öffnung zum Einbringen und Entnehmen eines Fluids aufweist und der zweite Ventilabschnitt eine von außen zugängliche zweite Öffnung zum Einbringen und Entnehmen eines Fluids aufweist;
• einem ersten Ventilelement, das innerhalb des ersten Ventilabschnitts zum reversiblen Verschließen der ersten Öffnung angeordnet ist, und einem zweiten Ventilelement, das innerhalb des zweiten Ventilabschnitts zum reversiblen Verschließen der zweiten Öffnung angeordnet ist, wobei
• die erste Öffnung und die zweite Öffnung parallel zum Flanschrand ausgerichtet sind; und
• der erste Ventilabschnitt an einer Außenseite eine umlaufende Vertiefung und einen danebenliegenden umlaufenden Überstand zum Koppeln des ersten Ventilabschnitts mit einer Befüll- und/oder Entnahmevorrichtung umfasst.

To achieve this object, the present invention relates in one aspect to a closure device according to claim 1 for closing a liquid bag, with

• a one-piece base body comprising a flat flange edge for connecting the base body to the liquid bag and a portal structure with a main section, a first valve section and a second valve section, wherein the first valve section has an externally accessible first opening for introducing and removing a fluid and the second valve section has an externally accessible second opening for introducing and removing a fluid;
• a first valve element arranged within the first valve section for reversibly closing the first opening, and a second valve element arranged within the second valve section for reversibly closing the second opening, wherein
• the first opening and the second opening are aligned parallel to the flange edge; and
• the first valve section comprises on an outer side a circumferential recess and an adjacent circumferential projection for coupling the first valve section to a filling and/or removal device.

Furthermore, in a further aspect, the present invention relates to a liquid container according to claim 14 with a liquid bag and a closure device as previously defined.

Preferred embodiments of the invention are described in the dependent claims. It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention. In particular, the liquid container can be designed in accordance with the embodiments described for the closure device in the dependent claims.

According to the invention, the use of a one-piece base body with two openings accessible from the outside is proposed. A liquid can be introduced through one of the openings, while a gas can be released through the other opening. The openings each close off a valve section, within each of which a valve element is arranged. The valve elements ensure that only a controlled filling or removal of liquid or gas (fluid) is possible. The valve elements close the openings, but can be brought into an open position in which the openings are open. Both valve elements function separately or independently of one another, so that it is possible to open one opening while the other is closed. The flange edge can be used to connect the closure device to a liquid bag, for example by welding. According to the invention, the first opening and the second opening are aligned parallel to the flange edge. The preferably circular openings lie in a plane that runs parallel to the plane of the flange edge. This makes the closure device according to the invention suitable for counterpressure filling. It is possible for a filling machine to efficiently approach both openings at the same time in order to carry out counter-pressure filling. By aligning the openings parallel to the flange edge, the closure device or the liquid container can be inserted into a filling machine. The inventive alignment of the two openings in conjunction with the one-piece base body results in efficient applicability of the inventive closure device in counter-pressure filling. In particular, it is possible to introduce carbonated drinks into a liquid container according to the invention. In addition, the inventive design allows for high stability against pressurized liquids in the bag. In contrast to previous closure devices, the invention thus enables cost-effective transport of carbonated drinks such as beer.

In a preferred embodiment, the first valve element comprises a tappet that is movably mounted perpendicular to the flange edge and a spring. The spring exerts a closing force on the tappet. The closing force presses a closing section of the tappet to close the first opening against a first closing edge within the first valve section. The spring can be compressed by an external force acting on the tappet, by which the tappet can be released from the first closing edge to open the first opening. The spring is preferably designed as a spiral spring. The closing edge is preferably aligned parallel to the flange edge. The use of a spring in conjunction with a tappet enables efficient implementation of the first valve element. A reliable seal is achieved. The use of a tappet in conjunction with a spiral spring ensures a long service life with a large number of opening and closing processes. The first opening can thus be designed, for example, for removing a drink using a corresponding tap with a device for exerting pressure on the tappet. In addition, sufficient stability is ensured even at high pressure.

In a preferred embodiment, the tappet comprises in its closure section a guide pin, which is accessible through the first opening from outside the first valve section, for guiding the tappet when the external force is applied. The guide pin preferably has a cylindrical shape. In addition or alternatively, the guide pin does not protrude beyond a side of the first valve section facing away from the flange edge. The guide pin makes it possible to ensure a controlled movement of the tappet during filling and removal. In a corresponding filling device, the tappet can be gripped or guided in order to be able to fill in gas in a controlled process, for example. The cylindrical shape of the guide pin enables simple automatic centering. The fact that the guide pin does not protrude beyond the valve section prevents destruction or defects.

In a further advantageous embodiment, the closure device comprises a guide element which is arranged to guide a movement of the tappet within the first valve section. The guide element is preferably designed to support the spring for exerting the closing force. Additionally or alternatively, the guide element preferably rests at three points on an inner side of the first valve section. The use of a guide element further improves the stability of the first valve. This results in improved stability, particularly at high pressure. It ensures that the liquid bag remains securely closed, even if the pressure inside increases. By supporting the spring at the same time, efficient and cost-effective manufacturability can be ensured. Bearing at three points results in a firm fit.

In a preferred embodiment, the closure device comprises a sealing element which is arranged to close the first opening within the first valve section between the closure section of the tappet and the first closure edge. The sealing element is preferably designed as a sealing disk. The sealing element can increase the reliability when closing the first opening. This is particularly advantageous when the pressure inside the liquid bag increases. It ensures that the first opening is closed, even if the spring force may decrease over its service life. A cost-effective implementation is achieved by using a sealing disc.

In a further advantageous embodiment, the second valve element is formed in one piece from elastic plastic and has a spring section that exerts a closing force on a flat closing section of the second valve element. The closing force presses the closing section to close the second opening against a second closing edge within the second valve section. The spring section can be compressed by an external force acting on the second valve element, by which the closing section can be released from the second closing edge to open the second opening. The spring section preferably comprises several elastic struts that are inclined in a direction perpendicular to the flange edge. The one-piece design of the second valve element from elastic plastic results in cost-efficient implementation. It is usually sufficient if one of the two openings can only be opened and closed again a few times during the filling process. In this respect, it is sufficient to use a one-piece valve element made of elastic plastic that is inexpensive to implement and reliable for a few closing processes. The use of inclined elastic struts nevertheless ensures sufficient closing force, which enables reliable closure of the second opening, even if the pressure inside the bag increases.

In a preferred embodiment, the closure device comprises a fastening tab which is designed for releasable coupling to projections in a region of the second valve section facing the flange edge in order to fix the second valve element within the second valve section A fastening tab is a cost-effective way of securing the second valve element. It provides sufficient stability while allowing for efficient manufacturing.

In a preferred embodiment, the main section is cylindrical. Additionally or alternatively, the main section comprises a gripping element in its circumference for fixing the closure device in a desired orientation. Furthermore, additionally or alternatively, the main section comprises a circumferential projection aligned parallel to the flange edge on a side facing away from the flange edge. Furthermore, additionally or alternatively, the main section has a circumferential web at the connection to the flange edge. The cylindrical design results in good handling in an automatic filling system. The gripping element can interact with corresponding elements in the filling system to enable reliable and time-efficient filling, in particular counterpressure filling. The projection enables improved holding of the closure device during the filling process. The circumferential web increases stability in the area of the coupling to the flange edge. In addition, it is ensured that when the closure device is connected to the liquid bag, for example in a welding process, a sufficient material thickness comes into contact with the liquid bag to ensure a reliable connection.

In a preferred embodiment, the first valve section is cylindrical. Additionally or alternatively, the first valve section projects beyond the main section perpendicular to the flange edge. According to the invention, the first valve section comprises a circumferential recess on an outer side and an adjacent circumferential projection for coupling the first valve section to a filling and/or removal device. The circumferential recess and the circumferential projection preferably have a frustoconical cross-section. The cylindrical design enables efficient coupling to a corresponding nozzle. an introduction and/or removal device. Such a filling and/or removal device works together with the recess and the projection in order to be able to introduce carbonated drinks in a counter-pressure filling. This prevents the first valve section from coming loose during filling. A truncated cone-shaped cross section of the recess or the projection enables centering.

In a further preferred embodiment, the closure device comprises a circumferential receptacle on an outer side of the first valve section for receiving a sealing ring. The sealing ring ensures reliable sealing even at higher pressure.

In a further preferred embodiment, the flange edge is circular. A circular flange edge enables the closure device to be easily positioned in relation to the bag during the welding process. Manufacturability remains efficient.

The base body is preferably designed as an injection-molded part. Injection-molded parts can be manufactured efficiently and cost-effectively.

In a preferred embodiment of the liquid bag, the flange edge of the closure device is welded to the liquid bag. A welded connection ensures a secure closure even at higher pressure.

Here, a one-piece base body is understood to mean in particular a single injection-molded part that can be manufactured in a corresponding injection molding process. Reversible closure is understood to mean closure that allows subsequent opening and re-closing. An opening accessible from the outside is an opening that is accessible by a filling and/or removal device when the closure device is held in such a device. A fluid is a gas or a liquid.

Figur 1

eine schematische perspektivische Ansicht einer erfindungsgemäßen Verschlussvorrichtung;

Figur 2

eine Draufsicht auf die erfindungsgemäße Verschlussvorrichtung;

Figur 3a

eine Seitenansicht der Verschlussvorrichtung;

Figur 3b

eine seitliche Schnittansicht der Verschlussvorrichtung;

Figur 4

eine schematische Schnittansicht in einer Ebene parallel zum Flanschrand;

Figur 5

eine schematische Seitenansicht; und

Figur 6

eine schematische eine perspektivische Ansicht des ersten Ventilelements.

The invention is described and explained in more detail below using some selected embodiments in conjunction with the accompanying drawings. They show:

Figure 1

a schematic perspective view of a closure device according to the invention;

Figure 2

a plan view of the closure device according to the invention;

Figure 3a

a side view of the locking device;

Figure 3b

a side sectional view of the locking device;

Figure 4

a schematic sectional view in a plane parallel to the flange edge;

Figure 5

a schematic side view; and

Figure 6

a schematic perspective view of the first valve element.

In the Fig.1 a closure device 10 according to the invention is shown schematically in a perspective view. The closure device 10 serves to close a liquid bag and together with the liquid bag forms a liquid container. Such liquid containers are used, for example, in bag-in-box systems or for storing or transporting syrup preparations for drinks machines. The closure device 10 according to the invention is particularly suitable for liquid bags in which carbonated liquids are to be held. In the case of carbonated liquids, such as beer, etc., a comparatively large force is exerted on the liquid bag and on the closure device, since a pressure of approximately 10 bar and more can arise within the liquid bag.

This is especially true if the fluid bag is exposed to direct sunlight or the contents foam due to vibrations. In addition, counterpressure filling must be possible.

The closure device 10 according to the invention is welded to the liquid bag. For this purpose, a base body 12 of the closure device 10 comprises a flange edge 14. The flange edge 14 is flat and level and is connected (welded) to the liquid bag. The welding to the liquid bag takes place before filling.

The base body 12 is formed in one piece as an injection-molded part. The base body 12 also comprises a portal structure 16, which in turn is formed by a main section 18, a first valve section 20 and a second valve section 22. The first valve section 20 has a first opening 24 accessible from the outside, the second valve section 22 has a second opening 26 accessible from the outside. The first opening 24 and the second opening 26 are aligned parallel to the flat flange edge 14. By aligning the first opening 24 and the second opening 26 parallel to the flange edge 14, accessibility in a filling and/or removal device is ensured.

When filling the liquid bag using counterpressure, it is first filled with a gas, which is usually introduced through the first opening 24. The pressurized liquid bag is then filled with liquid, while the gas is released again at the same time. Due to the larger diameter, the liquid is usually filled through the second opening 26. By keeping the pressure inside the liquid bag constant, carbonated liquid can be introduced.

In the Fig.2 is a schematic plan view of the closure device 10. The flange edge 14 is essentially circular in shape. The first opening 24 and the second opening 26 are located on a central axis M of the closure device 10 on both sides of a width axis B. The portal structure 16 is also essentially cylindrical and, in the view shown, is arranged concentrically with the flange edge 14.

In the Fig. 3a A schematic side view is shown, with a section plane A being drawn in, which runs through a height axis H. The Fig. 3b shows the corresponding sectional view.

The first valve section 20 is essentially cylindrical and projects beyond the main section 18 perpendicular to the flange edge 14. The second valve section 22 is arranged within the main section 18.

A first valve element 28 is arranged within the first valve section 20, which in the exemplary embodiment shown comprises a movably mounted tappet 30 and a spring 32. The spring 32 exerts a closing force on the tappet 30. In the view shown, the tappet 30 is pressed upwards by the spring 32, with a closing section 34 of the tappet 30 being pressed against a first closing edge 36 within the first valve section 20. The first closing edge 36 corresponds to a circular ring-shaped projection in the radial direction. The closing section 34 is essentially circular, with the circle having a larger diameter than the inner circle of the first closing edge 36. To open the first opening 24, a force can be exerted on the tappet 30 from the outside (above), so that the closing section 34 detaches from the closing edge. This enables fluid to flow through the first valve section 20. Because an inner diameter of the first valve portion 20 is larger than a diameter of the tappet 30 in the region of its closure portion 34, fluid can flow past the tappet into or out of the liquid bag.

In the embodiment shown, the plunger 30 further comprises a guide pin 38 which is accessible from the outside and serves to guide the plunger 30 when the external force is applied. The guide pin 38 of the In the embodiment shown, the tappet 30 has a cylindrical shape and does not protrude beyond the first valve section 20 on a side facing away from the flange edge 14. The guide pin 38 can be packed in a filling and/or removal device, so to speak, in order to open and close the first valve element 28. The cylindrical shape of the guide pin 38 serves for easy centering. The guidance of the guide pin 38 prevents the tappet from getting caught within the first valve section 20 when closing the first opening 24, which would prevent the first opening 24 from being closed.

The counterforce on the spring 32, which is preferably designed as a spiral spring, is exerted by a guide element 40 on which the spring 32 rests. The plunger 30 is guided by the guide element 40.

To better close the first opening, a sealing element 42 can be provided between the first closing edge 36 and the closing section 34 of the tappet 30, which in the illustrated embodiment is designed as a sealing disk. The sealing disk serves to ensure that no fluid can penetrate or escape when the first valve element 28 is in the closed position. The use of the sealing disk results in improved long-term tightness.

A second valve element 44 is arranged within the second valve section 22 and serves to reversibly close the second opening 26. In the exemplary embodiment shown, the second valve element 44 is formed in one piece from elastic plastic. It comprises a spring section 46 which exerts a closing force on a flat end section 48 of the second valve element 44, by means of which the end section 48 is pressed against a second closing edge 50 within the second valve section 22. The closing section 48 is essentially flat and circular, the diameter of the end section 48 being larger than the inner circle diameter of the circular ring formed by the second closing edge 50. To exert the spring force, the spring section 46 comprises a plurality of elastic struts 52 that can be compressed under pressure. When the end portion 48 of the second valve element 44 is released from the second closure edge 50, fluid can flow through the second opening 26. For example, liquid can be introduced.

A detachable fastening tab 54 is provided for fastening the second valve element 44 within the second valve section 22. The fastening tab can be secured to fastening projections 56 in an area of the second valve section 22 facing the flange edge 14. This allows the second valve element 44 to be secured within the second valve section 22. When assembling the closure device 10 according to the invention, the second valve element 44 can therefore be introduced into the second valve section 22 from below in the illustration shown. The fastening tab 54 is then coupled to the fastening projections 56 in order to absorb the counterforce for exerting the closure force between the end section 48 and the second closure edge 50. The fastening tab 54 is preferably also designed as an injection-molded part.

In the Fig.4 is a schematic view of a further sectional view in a plane perpendicular to the height axis H or parallel to the width axis B and center axis M in the area of the guide element 40. The sectional plane E is in the Fig. 3a As shown, the guide element 40 for guiding the movement of the tappet 30 and for supporting the spring 32 is supported at three points on an inner side of the first valve section 20.

In Fig.5 is a schematic representation of a further side view of the closure device 10 according to the invention. The first valve section 20 has on its outside a circumferential recess 58 and an adjacent circumferential projection 60 for coupling with a corresponding nozzle of a filling and/or removal device. Both the circumferential recess 58 and the circumferential projection 60 have a frustoconical cross-section. It is possible to design the closure device 10 in the area of the first valve section 20 at the circumferential recess or in the circumferential projection 60 in order to be able to carry out a filling or removal process even under pressure.

In addition, the closure device 10 has a circumferential receptacle 62 which has a substantially rectangular cross-section. The receptacle 62 serves to accommodate a sealing ring in order to achieve a seal during the filling and/or removal process.

In order to fix the entire closure device 10 during the filling and/or removal process, the main portion 18, which is substantially cylindrical, comprises in its circumference a gripping element 64 for fixing the closure device 10 in a predetermined orientation with respect to rotation.

Furthermore, the main section 18 is delimited on its side facing away from the flange edge 14 by a projection 66 aligned parallel to the flange edge 14. This projection also serves to ensure that the closure device 10 is securely fixed in a filling and/or removal device. The projection 66 makes it possible to grip the closure device 10.

Furthermore, the main section 18 comprises a circumferential web 68 in the area of the connection to the flange edge 14, which serves to increase the stability of the connection between the main section 18 and the flange edge 14. In addition, this results in better connection to the liquid bag.

In the Fig.6 A perspective view of the first valve element 28 with the tappet 30 and the spring 32 as well as the guide element 40 is shown schematically. The closure section 34 of the tappet 30 is essentially circular. The spring 32 sits on the guide element 40 and the tappet 30 is guided by the guide element 40.

The invention has been fully described and explained with reference to the drawings and the description. The description and explanation are to be understood as exemplary and not restrictive. The invention is not limited to the disclosed embodiments. Other embodiments or variations will become apparent to those skilled in the art upon use of the present invention and upon careful analysis of the drawings, the disclosure and the following claims.

In the claims, the words "comprising" and "having" do not exclude the presence of further elements or steps. The undefined article "a" or "an" does not exclude the presence of a plurality. A single element or unit can perform the functions of several of the units mentioned in the claims. The mere mention of some measures in several different dependent claims should not be understood to mean that a combination of these measures cannot also be used advantageously. Reference signs in the claims are not to be understood as limiting.

List of reference symbols

10

Locking device

12

Base body

14

Flange edge

16

Portal structure

18

Main section

20

first valve section

22

second valve section

24

first opening

26

second opening

28

first valve element

30

Pestle

32

Feather

34

Closure section

36

first closing edge

38

Guide pin

40

Guide element

42

Sealing element

44

second valve element

46

Spring section

48

Final section

50

second closing edge

52

strut

54

Mounting bracket

56

Mounting overhang

58

circumferential recess

60

circumferential overhang

62

circumferential recording

64

Gripping element

66

Got over

68

web

Claims (15)

1. Closure device (10) for closing a liquid pouch, comprising:

   a base body (12) formed as a one-piece element, comprising a flat flange edge (14) for connecting the base body to the liquid pouch, and a portal structure (16) with a main section (18), a first valve section (20) and a second valve section (22), wherein the first valve section comprises a first opening (24) that is accessible from the outside and that is designed for inserting and withdrawing a fluid, and the second valve section comprises a second opening (26) that is accessible from the outside and that is designed for inserting and withdrawing a fluid;

   a first valve element (28) that is arranged within the first valve section for reversibly closing the first opening, and a second valve element (44) that is arranged within the second valve section for reversibly closing the second opening,

   wherein the first opening is arranged parallel to the flange edge, characterized in that the second opening is arranged parallel to the flange edge, and

   the first valve section (20) comprises a circumferential recess (58) and an adjacent circumferential protrusion (60) for coupling the first valve section with a filling and/or withdrawal device.
2. Closure device (10) according to claim 1, wherein

   the first valve element (28) comprises a tappet (30), which is mounted movably perpendicular to the flange edge (14), and a spring (32);

   the spring exerts a closing force on the tappet, by which a closing section (34) of the tappet is pushed against a first closing edge (36) within the first valve section (20) for closing the first opening (24);

   the spring is compressible by an external application of force on the tappet, by which the tappet can be released from the first closing edge for opening the first opening; and

   preferably the spring is designed as a coil spring and/or the closing edge is arranged parallel to the flange edge.
3. Closure device (10) according to claim 2, wherein

   the tappet (30) comprises a guide pin (38) in its closing section (34) for guiding the tappet when the external force is applied, which guide pin is accessible from the outside of the first valve section (20) through the first opening (24); and

   the guide pin preferably has a cylindrical form and/or does not project above a side of the first valve section facing away from the flange edge (14).
4. Closure device (10) according to any one of claims 2 to 3, comprising a guide element (40) that is arranged within the first valve section (20) and that is designed for guiding a movement of the tappet (30), wherein
   the guide element is preferably designed to support the spring (32) during exertion of the closing force and/or abuts on three points on an inner side of the first valve section.
5. Closure device (10) according to any one of claims 2 to 4, comprising a sealing element (42) that is arranged within the first valve section (20) between the closing section (34) of the tappet (30) and the first closing edge (36) and that is designed for closing the first opening (24), wherein
   the sealing element is preferably designed as a sealing washer.
6. Closure device (10) according to any one of the preceding claims, wherein

   the second valve element (44) is formed in one piece from elastic plastic material and comprises a spring section (46), which exerts a closing force on a plane end section (48) of the second valve element, by which force the end section is pressed against a second closing edge (50) within the second valve section (22) for closing the second opening (26);

   the spring section is compressible by an external application of force on the second valve element, by which force the end section can be released from the second closing edge for opening the second opening; and

   the spring section preferably comprises a plurality of elastic struts (52) which are inclined against a direction perpendicular to the flange edge (14).
7. Closure device (10) according to claim 6, comprising a mounting strap (54) that is designed for removably coupling to protrusions in an area of the second valve section (22) facing the flange edge (14) to secure the second valve element (44) within the second valve section.
8. Closure device (10) according to any one of the preceding claims, wherein the main section (18)

   is designed cylindrically;

   in its circumference comprises a gripping element (64) for retaining the closure device in a desired orientation;

   comprises a circumferential protrusion (66) that is oriented parallel to the flange edge on a side facing away from the flange edge (14); and/or

   comprises a circumferential web (68) at the connection to the flange edge.
9. Closure device (10) according to any one of the preceding claims, wherein

   the first valve section (20) is designed cylindrically;

   the first valve section (20) projects above the main section (18) perpendicular to the flange edge (14); and/or

   the circumferential recess and the circumferential protrusion have a frustoconical cross-section.
10. Closure device (10) according to any one of the preceding claims, comprising a circumferential receptacle (62) at an outer side of the first valve section (20) for receiving a sealing washer.
11. Closure device (10) according to any one of the preceding claims, wherein the second valve section (22) is arranged within the main section (18).
12. Closure device (10) according to any one of the preceding claims, wherein the flange edge (14) is designed annularly.
13. Closure device (10) according to any one of the preceding claims, wherein the base body (12) is designed as an injection-molded piece.
14. Liquid container comprising a liquid pouch and a closure device (10) according to any one of the preceding claims.
15. Liquid container according to claim 14, wherein the flange edge (14) of the closure device is welded to the liquid pouch.

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