EP3736225A1 - Closure device and fluid container - Google Patents

Abstract

The present invention relates to a closure device (10) for closing a liquid bag, having: an integrally formed base body (12) comprising a flat flange edge (14) for connecting the base body to the liquid bag and a portal structure (16) with a main section (18), a first valve section (20) and a second valve section (22), the first valve section having an externally accessible first opening (24) for introducing and removing a fluid and the second valve section having an externally accessible second opening (26) for introducing and removing Removing a fluid; a first valve element (28) which is arranged within the first valve section for reversibly closing the first opening, and a second valve element (44) which is arranged within the second valve section for reversibly closing the second opening, the first opening and the second Opening are aligned parallel to the flange edge. The invention also relates to a liquid container with a liquid bag and a closure device (10).

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 packaged in a liquid bag, which mostly consists of a film composite material (for example aluminum / HDPE or polyethylene). This liquid bag is then received in an outer packaging, for example a cardboard box or a wooden box. The liquid is withdrawn by a withdrawal device, which can be designed, for example, as a tap for manual withdrawal of the liquid. 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 carbonic acid so that it can be removed in a drinkable form. The syrup is usually provided in a liquid bag.

The fluid bags must have an opening for filling and removing fluid. The opening is closed with a closure device which enables the liquid bag to be closed after filling and opened for removal. In previous approaches, 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 has mostly been used. After filling through the lower part, the upper part is joined to the lower part and the liquid bag is closed with it.

However, this use of two-part closure devices has several disadvantages. On the one hand, the 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, the filling through the lower part and the subsequent assembly with the upper part is comparatively labor-intensive.

In order to improve the previous approach of using two-part closure devices, in this context in DE 10 2015 014 372 A1 discloses a closure with a flanged component closure plug. The closure disclosed is provided with a fastening flange, such as the usual bung had so far. Portals on the closure meet 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 brought into the container via portals through the closure itself, which enables a closed filling and removal system.

A previously neglected area of application for liquid bags is in the packaging of carbonated beverages. This usually requires counter pressure filling. A pressurized container is filled with liquid, with a gas (usually CO ₂ ) in the container being released at the same time. The counter pressure filling is prevents the carbonated liquid from foaming. Previous closure devices for liquid bags are not suitable for such a counter pressure filling due to their structure.

On the basis of this, the present invention has the object of providing a closure device that can also be used in counter pressure filling. In particular, a closure device is to be created which enables efficient, automated counterpressure filling, so that carbonated liquids can be packaged in liquid pouches. In addition, efficient manufacturability, good disinfectability and adequate stability against higher pressure should be ensured. For example, a pressure of up to approx. 10 bar can occur when 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.

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

• an integrally formed 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, the first valve section having 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 which is arranged within the first valve section for reversibly closing the first opening, and a second valve element which is 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.

In a further aspect, the present invention further relates to a liquid container with a liquid bag and a closure device as defined above.

Preferred embodiments of the invention are described in the dependent claims. It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention. In particular, the liquid container can be designed according to the configurations described for the closure device in the dependent claims.

According to the invention, the use of a one-piece base body with two externally accessible openings is proposed. A liquid can be introduced through one of the openings, while a gas can be discharged 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 work separately or independently of one another, so that it is possible to open one opening while the other is closed. The closure device can be connected to a liquid bag through the flange edge, 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 which runs parallel to the plane of the flange edge. This makes the closure device according to the invention suitable for counter-pressure filling. It is made possible that an automatic filling machine can 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 an automatic filling machine. The inventive alignment of the two openings in connection with the one-piece base body results in efficient applicability of the closure device according to the invention in counter-pressure filling. In particular, it is possible to introduce carbonated beverages into a liquid container according to the invention. In addition, the construction according to the invention allows a high level of stability against pressurized liquids in the bag. In contrast to previous closure devices, the invention thus enables carbonated beverages such as beer to be transported at low cost.

In a preferred embodiment, the first valve element comprises a plunger mounted so as to be movable perpendicular to the flange edge and a spring. The spring exerts a locking force on the plunger. As a result of the closing force, a closing section of the plunger is pressed against a first closing edge within the first valve section to close the first opening. The spring can be compressed by an external force acting on the plunger, by means of which the plunger can be released from the first closing edge in order 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 connection with a tappet enables the first valve element to be implemented efficiently. A reliable seal is achieved. The use of a plunger in conjunction with a spiral spring ensures a long service life with a large number of opening and closing processes. The first opening can thereby be designed, for example, for removing a drink by means of a corresponding tap with a device for exerting pressure on the plunger. In addition, sufficient stability is ensured even at high pressure.

In a preferred embodiment, the plunger comprises in its closure section a guide pin, which is accessible through the first opening from outside the first valve section, for guiding the plunger when the external force is exerted. The guide pin preferably has a cylindrical shape. In addition or as an alternative, 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 plunger during filling and removal. The plunger can be gripped or guided in a corresponding filling device in order, for example, to be able to fill in gas in a controlled process. The cylindrical shape of the guide pin enables easy automatic centering. The fact that the guide pin does not protrude beyond the valve section prevents destruction or a defect.

In a further advantageous embodiment, the closure device comprises a guide element which is arranged to guide a movement of the plunger 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 rests preferably 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 fluid bag remains securely closed even if the pressure inside increases. Because the spring is supported at the same time, an efficient and inexpensive producibility can be ensured. A storage at three points results in a tight fit.

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

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

In a preferred embodiment, the closure device comprises a fastening tab which is designed for detachable coupling to protrusions in an area of the second valve section facing the flange edge, around the second valve element within the second valve section to be determined. A fastening tab represents an inexpensive way of securing the second valve element. This results in sufficient stability and, at the same time, efficient manufacture.

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, on a side facing away from the flange edge, a circumferential protrusion aligned parallel to 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 easy handling in an automatic filling system. The gripping element can interact with corresponding elements in the filling system in order to enable reliable and time-efficient filling, in particular counter-pressure filling. The protrusion enables an improved holding of the closure device during the filling process. The surrounding web increases the 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 in order to ensure a reliable connection.

In a preferred embodiment, the first valve section is cylindrical. Additionally or alternatively, the first valve section protrudes beyond the main section perpendicular to the flange edge. Furthermore, additionally or alternatively, the first valve section comprises on an outer side a circumferential depression and an adjacent circumferential protrusion for coupling the first valve section to a filling and / or removal device. The circumferential recess and the circumferential protrusion preferably have a frustoconical cross section. The cylindrical design enables efficient coupling to a corresponding connector an introduction and / or removal device. Such a filling and / or removal device interacts with the recess and the supernatant in order to be able to introduce carbonated beverages in a counterpressure filling. It is avoided that the first valve section can come loose during filling. A frustoconical cross-section of the depression or the protrusion enables centering.

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

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

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

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

In this context, a single-piece base body is understood to mean, in particular, a single injection-molded part that can be manufactured in a corresponding injection-molding process. A reversible closing is understood to mean a closing that enables subsequent opening and renewed closing. An externally accessible opening is an opening that is accessible through 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 with reference to a few selected exemplary embodiments in conjunction with the accompanying drawings. Show it:

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 closure device;

Figure 3b

a side sectional view of the closure 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 closing device 10 is used 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 received. 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 approx. 10 bar and more can arise within the liquid bag. This is especially true if the liquid bag is exposed to direct sunlight exposed or the content foams due to vibration. 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 flat and is connected (welded) to the liquid bag. The sealing with the liquid bag takes place before the filling.

The base body 12 is designed in one piece as an injection molded part. The base body 12 furthermore 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 an externally accessible first opening 24, the second valve section 22 has an externally accessible second opening 26. The first opening 24 and the second opening 26 are aligned parallel to the flat flange edge 14. The alignment of the first opening 24 and the second opening 26 parallel to the flange edge 14 ensures accessibility in a filling and / or removal device.

When the liquid bag is filled with 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, with the gas being released again at the same time. The filling with liquid is mostly carried out through the second opening 26 due to the larger diameter. Because the pressure inside the liquid bag is kept constant, carbonated liquid can be introduced.

In the Fig. 2 a schematic plan view of the closure device 10 is shown. The flange edge 14 is formed essentially in the shape of a circular ring. The first opening 24 and the second opening 26 lie 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, wherein a sectional plane A is drawn, which runs through a height axis H. The Figure 3b shows the corresponding sectional view.

The first valve section 20 is essentially cylindrical and projects beyond the main section 18 perpendicularly 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 illustrated embodiment comprises a movably mounted plunger 30 and a spring 32. A closing force is exerted on the plunger 30 by the spring 32. In the view shown, the plunger 30 is pressed upward by the spring 32, a closure section 34 of the plunger 30 being pressed against a first closure edge 36 within the first valve section 20. The first closing edge 36 corresponds to an annular projection in the radial direction. The closure section 34 is essentially circular, the circle having a larger diameter than the inner circle of the first closure edge 36. To open the first opening 24, a force can be exerted on the plunger 30 from the outside (above), so that the closure section 34 is released from the closure edge. This enables a fluid flow through the first valve section 20. Because an inside diameter of the first valve section 20 is greater than a diameter of the plunger 30 in the area of its closure section 34, fluid can flow past the plunger into the liquid bag or out of the liquid bag.

In the exemplary embodiment shown, the plunger 30 also comprises a guide pin 38 which is accessible from the outside and serves to guide the plunger 30 when the external force is exerted. The guide pin 38 of the In the exemplary 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, so to speak, be packed in a filling and / or removal device in order to open the first valve element 28 and to close it again. The cylindrical shape of the guide pin 38 is used for simple centering. By guiding the guide pin 38, it is prevented that the plunger gets caught within the first valve section 20 when the first opening 24 is closed, thereby preventing 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.

For better closing of the first opening, a sealing element 42 can be provided between the first closing edge 36 and the closing section 34 of the plunger 30, which in the illustrated embodiment is designed as a sealing disk. The sealing disk serves to prevent fluid from entering or escaping when the first valve element 28 is in the closed position. The use of the sealing washer results in improved long-term tightness.

A second valve element 44, which serves to reversibly close the second opening 26, is arranged within the second valve section 22. In the illustrated embodiment, 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 closing section 48 of the second valve element 44, by means of which the closing section 48 is pressed against a second closing edge 50 within the second valve section 22. The terminating section 48 is essentially flat and circular, the diameter of the terminating section 48 being greater than the inner circle diameter of the circular ring formed by the second closing edge 50. To exert the spring force, the spring section comprises 46 a plurality of elastic struts 52 that can be compressed under pressure. When the closing section 48 of the second valve element 44 is detached from the second closing 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 strap can be fixed to fastening protrusions 56 in a region of the second valve section 22 facing the flange edge 14. As a result, the second valve element 44 can be fixed within the second valve section 22. During the assembly of 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 protrusions 56 in order to absorb the counterforce for exerting the closing force between the closing section 48 and the second closing edge 50. The fastening tab 54 is preferably also designed as an injection-molded part.

In the Fig. 4 a further sectional view is shown schematically in a plane perpendicular to the height axis H or parallel to the width axis B and central axis M in the region of the guide element 40. The cutting plane E is in the Fig. 3a drawn. 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 a further side view of the closure device 10 according to the invention is shown schematically. The first valve section 20 has on its outside a circumferential recess 58 and an adjacent circumferential protrusion 60 for coupling to 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 use the locking device 10 in the area of the first valve section 20 to grip the circumferential depression or in the circumferential protrusion 60 in order to be able to carry out a filling or removal process 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 receive 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 section 18, which is essentially cylindrical, comprises a gripping element 64 in its circumference 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 protrusion 66 aligned parallel to the flange edge 14. This protrusion also serves to ensure that the closure device 10 is securely fixed in a filling and / or removal device. The protrusion 66 makes it possible to grip the locking device 10.

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

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

The invention has been comprehensively described and explained with reference to the drawings and the description. The description and explanation are to be understood as examples 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 after using the present invention and after carefully analyzing 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 a single unit can perform the functions of several of the units mentioned in the patent claims. The mere mention of some measures in several different dependent patent 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 restrictive.

List of reference symbols

10

Locking device

12

Base body

14th

Flange edge

16

Portal structure

18th

Main section

20th

first valve section

22nd

second valve section

24

first opening

26th

second opening

28

first valve element

30th

Plunger

32

feather

34

Locking section

36

first sealing edge

38

Leadership pin

40

Guide element

42

Sealing element

44

second valve element

46

Spring section

48

Final section

50

second sealing edge

52

strut

54

Fastening tab

56

Fastening overhang

58

circumferential recess

60

circumferential overhang

62

circumferential recording

64

Gripping element

66

Got over

68

web

Claims (15)

Closing device (10) for closing a liquid bag, with: an integrally formed base body (12) comprising a flat flange edge (14) for connecting the base body to the liquid bag and a portal structure (16) with a main section (18), a first valve section (20) and a second valve section (22), wherein the the first valve section has an externally accessible first opening (24) for introducing and removing a fluid and the second valve section has an externally accessible second opening (26) for introducing and removing a fluid; a first valve element (28) which is arranged within the first valve section for reversibly closing the first opening, and a second valve element (44) which is 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. The closure device (10) of claim 1, wherein
the first valve element (28) comprises a plunger (30) mounted so as to be movable perpendicular to the flange edge (14) and a spring (32);
the spring exerts a closing force on the tappet, by means of which a closing section (34) of the tappet for closing the first Opening (24) is pressed against a first closure edge (36) within the first valve section (20);
the spring is compressible by an external force acting on the plunger, by means of which the plunger can be released from the first closing edge in order to open the first opening; and
preferably the spring is designed as a spiral spring and / or the closure edge is aligned parallel to the flange edge. The closure device (10) of claim 2, wherein
the tappet (30) comprises in its closure section (34) a guide pin (38) accessible through the first opening (24) from outside the first valve section (20) for guiding the tappet when the external force is exerted; and
the guide pin preferably has a cylindrical shape and / or does not protrude beyond a side of the first valve section facing away from the flange edge (14). Closure device (10) according to one of Claims 2 to 3, with a guide element (40) which is arranged for guiding a movement of the tappet (30) within the first valve section (20), wherein
the guide element is preferably designed to support the spring (32) for exerting the closing force and / or to bear against an inside of the first valve section at three points. Closing device (10) according to one of claims 2 to 4, with a sealing element (42) which is used to close the first opening (24) within the first valve section (20) between the closing section (34) of the plunger (30) and the first closing edge (36) is arranged, wherein
the sealing element is preferably designed as a sealing washer. Closure device (10) according to one of the preceding claims, wherein
the second valve element (44) is formed in one piece from elastic plastic and has a spring section (46) which exerts a closing force on a flat end section (48) of the second valve element, through which the end section for closing the second opening (26) to a second The closure edge (50) is pressed within the second valve section (22);
the spring section can be compressed by an external force acting on the second valve element, by means of which the closing section can be detached from the second closing edge in order to open the second opening; and
the spring section preferably has a plurality of elastic struts (52) which are inclined with respect to a direction perpendicular to the flange edge (14). Closure device (10) according to claim 6, with a fastening tab (54) which is designed for detachable coupling to protrusions in an area of the second valve section (22) facing the flange edge (14), around the second valve element (44) within the second valve section to be determined. Closure device (10) according to one of the preceding claims, wherein the main section (18)
is cylindrical;
comprises in its periphery a gripping element (64) for fixing the closure device in a desired orientation;
on a side facing away from the flange edge (14) comprises a circumferential protrusion (66) oriented parallel to the flange edge; and or
has a peripheral web (68) at the connection to the flange edge. Closure device (10) according to one of the preceding claims, wherein the first valve section (20)
is cylindrical;
the main section (18) protrudes perpendicular to the flange edge (14); and or
comprises a circumferential recess (58) and an adjacent circumferential protrusion (60) for coupling the first valve section to a filling and / or removal device on an outer side, the circumferential recess and the circumferential protrusion preferably having a frustoconical cross-section. Closure device (10) according to one of the preceding claims, with a circumferential receptacle (62) on an outer side of the first valve section (20) for receiving a sealing ring. Closure device (10) according to one of the preceding claims, wherein the second valve section (22) is arranged within the main section (18). Closure device (10) according to one of the preceding claims, wherein the flange edge (14) is designed in the shape of a circular ring. Closure device (10) according to one of the preceding claims, wherein the base body (12) is designed as an injection molded part. A liquid container with a liquid bag and a closure device (10) according to one of the preceding claims. The liquid container according to claim 14, wherein the flange edge (14) of the closure device is welded to the liquid bag.

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