EP0950011A1

EP0950011A1 - Closure with a pressure compensation valve for a liquid container

Info

Publication number: EP0950011A1
Application number: EP98962196A
Authority: EP
Inventors: Kurt Oberhofer; Karl Batschied; Udo Schreiner
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-03
Filing date: 1998-10-30
Publication date: 1999-10-20
Anticipated expiration: 2018-10-30
Also published as: EP0950011B1; US6065631A; ATE215486T1; AU1748599A; DE59803615D1; US6161716A; EP0950010B1; AU1748699A; WO1999023008A1; WO1999023009A1; ATE237521T1; DE29823387U1; DE59807960D1; EP0950010A1

Abstract

The closure has a bung plug (10) made of a soft elastic material and comprises a flange-like external support part (12), a sealing member (16) surrounding the edge of the orifice and sealing the latter and a locking member (18) surrounding the edge of the orifice and engaging inwards from the inside thereof. A coaxial reinforcement ring (20) made of a hard plastic material is embedded in the sealing member (16) and the locking member (18) of the bung plug (10), the periphery of said ring being radially undulated and covered by the soft elastic material with a varying thickness along its entire periphery. The bung plug (10) has a central orifice (24) in which a manually adjustable valve element (26) of the pressure compensation valve can be brought to a sealed closing position and to a pressure compensation position.

Description

Closure with pressure compensation valve for a liquid container

description

The invention relates to a closure with pressure-compensating valve for d ^'ie filling a liquid container with a matching in the round opening bung-type socket of soft-elastic material, which engages behind a flange-like outer bearing portion, a the edge of the opening receiving sealingly circumferential sealing part, an the edge of the opening inside has circumferential locking portion and a central opening, and with a manually adjustable valve member, which assumes a sealing closed position and a pressure compensation position in the central opening, in which the interior of the container communicates with the environment.

Such a closure is known from DE 42 19 571 C2. It is used for containers in the form of barrels, small barrels (party barrels) or cans in which liquids, especially drinks, are filled under pressure or under pressure. It is especially about party kegs for beer.

As shown in DE 33 45 619 C2, considerable locking and sealing requirements are imposed on the locking and sealing properties of the bung of the closure. To meet these requirements, DE 33 45 619 C2 proposes to construct the sheet pile sleeve from a soft part and a hard part, which surrounds the soft part like a cage and is penetrated by the soft part at the openings between the cage webs. The flange-like outer contact part of the soft part is with a flange on the The hard part is stiffened, and outwardly projecting catches are provided on the hard part.

A disadvantage of this bung is its complicated structure, which first requires injection molding of the hard part and then injection molding of the soft part in a second stage. Due to the fact that hard and soft parts alternate over the circumference of the bung, a tightness problem can occur at the edges in between. There are also deposits here that can be accompanied by undesirable bacterial growth.

The object of the invention is to provide a closure of the type mentioned with a bung that is reinforced with hard plastic, but has a homogeneous soft surface and is so simplified in construction that manufacturing in two-plastic injection molding technology is possible.

This object is achieved with such a closure in that a coaxial reinforcing ring made of hard plastic is embedded in the sealing section and locking section of the bung-type bushing, which is radially corrugated over the circumference and is thus covered by the flexible material in varying thicknesses.

In a preferred embodiment, the latching section and the reinforcing ring have a hook profile that is the same everywhere over the circumference.

The bung of the closure according to the invention is preferably produced in two-plastic injection molding technology. In a preferred embodiment, the valve member engages in the closed position and the pressure equalization position on the bung.

The valve member can rotate between the closed position and the pressure compensation position in the central opening and / or can be axially displaced. A purely rotary adjustment of the valve member is possible as well as an axial adjustment, wherein pushing the valve member into the sheet pintle or pulling it out of the sheet pintle is equally possible in order to bring the valve member out of the closed position into the pressure compensation position and vice versa. A combined rotation and axial adjustment of the valve member, in particular a pitch adjustment in the manner of a bayonet lock, is also possible.

In a preferred embodiment, the valve member has at least one handle for rotating and / or pulling out. Preferably, the handle can be laid flat against the top of the sheet pile. It can come to rest sunk in a recess in the sheet pile in the flat state so that it does not bulge under storage and transport conditions. In a preferred embodiment, the recess has an extension which enables the flat handle to be gripped under.

In a preferred embodiment, the closure has tamper-evident protection, which reveals whether the pressure compensation valve has already been actuated or not.

In a preferred embodiment, the valve member is provided with a highly flexible handle, which has webs is attached to the valve member, which tear off when bending up for the first time.

The closure known from DE 42 19 571 C2 has a bung with alternately larger and smaller axial ventilation grooves on the wall of the central opening and a valve member with alternately larger and smaller axial ventilation ribs on the outer jacket. The valve member has locking positions in which mating grooves and ribs are engaged and pressure compensation positions in which mating grooves and ribs are engaged.

When the liquid container is full, the bottom end of the bung-type can is immersed in the liquid. An actuation of the pressure compensation valve then has the consequence that liquid escapes from the container. A further disadvantage is that it is difficult to distinguish whether the valve member of the pressure compensation valve is in one of the several possible closed positions or pressure compensation positions.

The object of a preferred embodiment of the invention is a perfectly hygienic, simple and safe-to-use closure which makes it possible to equalize the pressure when the container is full.

In this embodiment, the bung has a lateral pressure equalization channel, the outer mouth of which is above the liquid level in the fully filled container. The valve member can be limited in rotation from a clearly specified closed position to a clearly specified pressure equalization position and back. The valve member opens in the pressure same position, a flow path from the inner mouth of the pressure equalization channel to the top of the bung, which it shuts off on the inside, covers on the outside and closes tightly on the inside and outside.

The clear specification of a closure position and pressure compensation position and the stop-limited rotation adjustment of the valve member in between make this closure very easy to use. The positions can be marked well and it can be seen at any time whether the valve member is in the closed position or the pressure compensation position. The outer covering and sealing of the pressure equalization flow path with the valve member in the closed position ensures that no residual liquid or rinsing liquid can enter the closure during filling. The closure thus meets the highest hygiene requirements.

In a preferred embodiment, the valve member has an outer flange that fits into a recess in the bung. A groove leading outward from the central opening is provided on the bottom of the recess. The valve member has a jacket groove which, in the pressure compensation position, connects the inner mouth of the pressure compensation channel with the groove on the bottom of the recess.

In a preferred embodiment, the flange of the valve member is out of round. It engages in the closed position and the pressure equalization position with a projection on the outside of the bung. In the closed position, the projection covers the outer end of the groove on the bottom of the recess. In a preferred embodiment, the valve member is notched over the circumference. The bung has a cam that picks up the notch and comes to a stop at its ends in order to limit the setting angle of the valve member and to specify the closed position and pressure compensation position.

In a preferred embodiment, the part of the valve member opposite the inner mouth of the pressure compensation channel forms a ramp in the circumferential direction, which ramps in the direction of rotation from the closed position to the pressure compensation position. Thanks to this ramp, the preload of the seal at the inner mouth of the pressure equalization channel is gradually reduced when the valve member is turned from the closed position to the pressure equalization position. This opens up the possibility of a gentle, gradual pressure equalization, and in particular a careful pressure release, for example before the first tap of beer.

The invention is explained below with reference to five exemplary embodiments shown in the drawing. Show it:

Figure 1 is a diametrical section through a first sheet pile.

Figure 2 is a reinforcement ring of the sheet pile in an axial plan view.

Figure 3 is a side view of a valve member seated in the sheet pile can;

Figure 4 is an axial plan view of the valve member with a view in the direction IV of Fig. 3. 5 shows a diametrical section through the first bung-type bush with the valve member drawn in dashed lines in the closed position, the latter being drawn out separately in side view with the handle bars folded up;

FIG. 6 shows a diametrical section through the first bung bush with the valve element shown in dashed lines in the pressure compensation position; FIG.

FIG. 7 shows a diametrical section through a second bung-type bush with the valve element shown in dashed lines in the closed position; FIG.

Figure 8 is a reinforcement ring of the sheet pile in an axial plan view.

FIG. 9 is an axial plan view of the sheet pile rifle with a view in the direction IX of FIG. 7;

Fig. 10 as a detail, the valve member in side view;

FIG. 11 shows a diametrical section through the second sheet pile bushing with the valve element shown in dashed lines in the pressure compensation position; FIG.

FIG. 12 shows a diametrical section through a third sheet pile rifle; FIG.

13 shows a reinforcement ring of the sheet piling in an axial top view;

FIG. 14 is an axial plan view of the sheet pile can with a view in the direction XIV of FIG. 12;

15 is a side view of a valve member belonging to the third sheet pile sleeve;

FIG. 16 is a top view of it looking towards XVI of FIG. 15;

FIG. 17 shows a diametrical section through the third bung bush with the valve element shown in dashed lines in the closed position, which is drawn out separately; FIG. FIG. 18 shows a diametrical section through the third bung bush with the valve element shown in dashed lines in the pressure equalization position, which in turn is drawn out separately, namely rotated through 90 ° in relation to FIG. 17;

Figure 19 is a diametrical section through a fourth sheet pintle.

20 shows a reinforcement ring of the sheet piling in an axial top view;

FIG. 21 shows an axial plan view of the fourth sheet pile bushing with a view in the direction XXI of FIG. 19;

FIG. 22 shows the side view of a valve member belonging to the fourth sheet pile sleeve; FIG.

FIG. 23 is a top view of it looking towards XXIII of FIG. 22;

FIG. 24 shows a diametrical section through the fourth bung bush with the valve element shown in dashed lines in the closed position, which is drawn out separately; FIG.

FIG. 25 shows a diametrical section through the fourth bung bush with the valve element shown in dashed lines in the pressure equalization position, which in turn is drawn out separately, namely rotated through 90 ° in relation to FIG. 24;

26 shows the side view of the valve member of a fifth closure with a pressure compensation valve;

FIG. 27 shows a top view of the valve member with a view in the direction XXVII of FIG. 26;

28 shows a plan view from below of the valve member with a view in the direction XXVIII from FIG. 26;

29 shows the diametrical sectional view of a bung-type bush belonging to the closure;

30 shows a reinforcement ring of the sheet piling in an axial top view; FIG. 31 shows a top view of the sheet pile can with a view in the direction XXXI of FIG. 29; and

Fig. 32 is a top plan view of an assembly drawing of the sheet pile and valve member.

The closures described below serve to tightly close the filling opening of a liquid container. Examples of such containers are drums, small drums (party drums) or cans in which liquids, in particular drinks, are filled without pressure or under pressure. It is especially about party kegs for beer.

The filling opening of such containers is a circular hole located at the top during the filling process. The closure includes a bung 10 made of elastic material, the outside of which is substantially rotationally symmetrical about its central axis and has an outwardly projecting flange 12 with which it bears against the outer wall of the container. The bung 10 extends into the container with an essentially conical taper portion 14. The surface line of the tapering part 14 is curved in an S-shape. Between the flange 12 and the tapering part 14, the diameter of the bung 10 bounces back, so that an annular groove-shaped sealing part 16 is formed, into which the edge of the filling opening when sealing the bung 10 enters. The diameter widening of the bung 10 inside the sealing section 16 forms a circumferential locking section 18 with a hook profile that is the same everywhere over the circumference.

The bung 10 is stiffened in the area of the sealing section 16 and the locking section 18 by a reinforcement ring 20 made of hard plastic and completely embedded therein. On a stiffening of the sheet pile flange 12 is made of green - relieved of the structural simplification.

The reinforcing ring 20 has a hook profile that is the same everywhere over the circumference. It is arranged coaxially to the bung 10 and radially corrugated over the circumference. The reinforcement ring 20 thereby has four radial bulges 22, offset by 90 °, on which the overlap with the soft plastic material of the bung 10 is thinner than in between.

For the removal of liquid, the container has a lower removal opening which is separate from the filling opening. This can be a bung hole that is tapped with a tap fitting or the like, or a tap integrated into the container.

Due to vibrations during transport and / or heating, a considerable excess pressure can build up in beer barrels, which leads to the fact that initially almost only foam is tapped. It is advisable to carefully reduce this overpressure before tapping for the first time. For this purpose, the bung 10 is provided with a manually operated pressure compensation valve.

When liquids are withdrawn from the lower discharge opening without pressure, a depression occurs above the liquid level in the container. The container can be ventilated by means of the pressure compensation valve in order to reduce this negative pressure.

The bung 10 has a central opening 24 in which the valve member 26 of the pressure compensation valve sits. The valve member 26 is accessible from the outside for valve actuation. It takes in the central opening 24 of the bung 10 selectively have a sealing closed position or a pressure compensation position, in which the interior of the container communicates with the environment above the liquid level therein.

In the variant shown in FIGS. 1 to 6, the

Bung ^'10 a through axial central opening

24, which is graduated in diameter so that it narrows from the outside to the inside. Two annular beads 28, 30 axially spaced apart from one another protrude inward on the jacket of the opening portion of larger diameter.

The valve member 26 has a flange 32 on the outside, which in a

Recess 34 on the flange outer side of the bung 10 fits. A circular cylindrical sealing part 36 of smaller diameter borders on the inside of the flange 32 and adjoins this a circumferential collar 38 which projects radially outwards. Even further inward, the valve member 26 forms a right-angled cross, the bars 40 of which are notched 42 at the same axial height. The valve member 26 has a rotationally symmetrical sealing head 44 at its inner end.

On the flange outer side of the valve member 26 there are two opposing handle bars 46, each of which extends over almost half the circumference of the valve member 26. The handlebars 46 assume a storage and transport position lying flat against them in the recess 34 of the sheet pile sleeve 10. They are folded up in order to pull the valve member 26 a little out of the bung 10 to actuate the pressure compensation valve.

As can be seen in FIG. 5, the valve member 26 has a sealing seal in the central opening 24 of the bung 10 Final position, in which the sealing head 44 occupies the inner part of the smaller diameter of the central opening 24. The collar 38 of the valve member 26 comes to lie between the annular beads 28, 30 of the bung 10. The outer

Ring bead 28 acts with the sealing part 36 of the valve member

26 for dust sealing together.

As can be seen in Fig. 6, the valve member 26 can be pulled so far out of the bung 10 that the sealing head 44 emerges from the smaller diameter portion of the central opening 24 and the inner annular bead 30 engages in the notches 42 of the valve member 26. The sealing part 36 of the valve member 26 comes free from the outer annular bead 28, so that here an annular gap and a flow path into the interior of the container between the bars 40 of the valve member cross is released.

In the variant shown in FIGS. 7 to 11, the continuous central opening 24 of the bung 10 is essentially circular-cylindrical and is provided with an annular bead 28, 30 at its inner and outer end.

The valve member 26 has a round plate 48 on the outside, the diameter of which corresponds to the clear width of the central opening 24. The inside of the plate 48 is adjoined by a first circular-cylindrical sealing section 50 of smaller diameter, in which the outer annular bead 28 engages. Further inside, the valve member 26 forms a right-angled cross. At the inner end, the valve member 26 has a second circular-cylindrical sealing part 52 of smaller diameter for the inner annular bead 30 and a flange 56 which bears against the inner end face 54 of the bung 10. The valve member 26 is pressed into the bung 10 to bring it from the closed position to the pressure equalization position. In the latter, the inner annular bead 30 engages in notches on the bar 40 of the valve member cross.

For pulling out again, the valve member 26 has a central grip tab 58, which is attached to the outer plate 48 and extends laterally over the flange 12 of the bung 10 and assumes a storage and transport position lying flat against it in a recess 34 thereof. When the valve member 26 is pushed into the bung 10, the grip tab 58 straightens up automatically.

In the variant shown in FIGS. 12 to 18, the bung 10 has a central opening 24 in the form of a conical blind hole which tapers inwards and ends in a circular-cylindrical neck 60 and an essentially circular-cylindrical diameter widening 62. The flange 12 of the sheet pusher 10 has a circular cylindrical recess 34 on the outside and an annular bulge 28 behind it on the inside, which protrudes inward beyond the conical jacket of the central opening 24. A radial bore 64, which penetrates the bung 10 transversely, leads to the conical jacket.

The valve member 26 is substantially conical. It has an anchoring head 66 at the inner end which fits into the neck 60 and the diameter extension 62 of the central opening 24. On the outside, the valve member 26 has a flange 32 which fits into the recess 34 of the sheet pile sleeve 10. A circumferential sealing section 36 of smaller diameter adjoins this inside, into which the annular bead 28 of the sheet pile sleeve borders 10 snaps into place.

The valve member 26 has an eccentric axial bore 68, which leads to the conical jacket of the sheet pintle 10 and meets the radial bore 64 opening there in a certain angular position of the valve member 26. In order to equalize the pressure, the valve member 26 is rotated into this angular position on a diametrical handle web 70, which is attached to the outside of the flange 32, and brought back into its sealing closed position by turning it back or further.

The flange 32 of the valve member 26 is out of round. It has a radially protruding nose 72 which fits into extensions 74 of the bung hole 34. As a result, the sealing closed position and pressure compensation position of the valve member 26 is marked and locked in place. The positions are offset by 90 °.

The variant shown in FIGS. 20 to 25 is modified as follows compared to the last described:

The valve member 26 has a circumferential recess 76 on the outer casing 76. The sheet sleeve 10 has a web 78 on the inner casing which projects into the circumferential recess 76 and acts as a stop limiting the angle of rotation of the valve member 26.

Before the opening of the radial bore 64, the valve member 26 has a sealing bead 80 with a circumferential extent of almost 90 °. The sealing bead 80 blocks the opening of the radial bore 64 and only releases it in the pressure compensation position.

The off-center axial bore 68 of the valve member 26 only extends below its flange 32 and is here by one radial puncture channel 82 hit on the top of the bung 10. The branch channel 82 is covered by the flange 32 and, in the pressure compensation position of the valve member 26, is connected to a small axial opening 84 at the edge of the flange 32.

In the variant shown in "FIGS. 26 to 32, the central opening 24 of the bung 10 is a basically conical, inwardly tapering blind hole that is not continuously axially symmetrical, but rather conical 86, 88 distributed over the circumference and depth, 90, as well as circular cylindrical jacket parts 92, 94. The essentially complementarily designed valve member 26 thus has a well-defined assembly position in the central opening 24.

The flange 12 of the bung 10 has an essentially circular cylindrical recess 34 of large diameter on the outside and an annular bead 28 behind it, which projects radially inward beyond the cone jacket 86 of the central opening 24. The blind hole ends on the inside in a circular-bead-limited 96 neck 60 and a circular cylindrical diameter widening 62.

A pressure equalization channel in the form of a radial bore 64 leads to the jacket 92 of the blind hole and passes transversely through the bung 10 at approximately half the height. When the bung 10 is hammered in, the radial bore 64 is located above the liquid level in the fully filled container.

The valve member 26 has a flange 32 on the outside which fits into the recess 34 of the sheet pintle 10. A sealing portion 36 of smaller diameter adjoins this on the inside which the outer annular bead 28 of the bung 10 snaps into place. The valve member 26 tapers inwards with a conical 98, 100, 102 and circular-cylindrical jacket parts 104, 106 to a neck 108, and it ends in a circular-cylindrical head 66 of larger diameter. The inner annular bead 30 of the bung 10 snaps into the neck 108.

The valve member 26 has a notch 76 on the outer casing which extends over 90 ° in the circumferential direction. The bung sleeve 10 has a cam 78 on the inner casing which projects into the notch 76 and acts as a stop limiting the angle of rotation of the valve member 26.

The part of the valve member 26 opposite the inner mouth of the pressure compensation channel 64 forms a ramp in the circumferential direction, which drops in the direction of rotation from the closed position into the pressure compensation position.

The valve member 26 has an axial jacket groove 110 which extends from the height of the inner mouth of the pressure compensation channel 64 to the underside of the flange 32.

A groove 82 is provided on the bottom of the bung hole 34, which lies in the same diametral plane 64 as the pressure compensation channel and extends from the central opening 24 of the bung 10 to the outer edge of the recess 34.

The flange 32 of the valve member 26 is out of round. It has a radially protruding nose 72 which fits into two extensions 74 of the bung hole 34. As a result, the sealing closed position and pressure compensation position of the valve member 26 is marked and locked in place. The groove 82 on the bottom of the bung hole 34 ends in the extension 74 associated with the pressure compensation position.

In the pressure compensation position, a flow path between the interior of the container and the atmosphere is opened via the pressure compensation channel 64, the jacket groove 110 and the groove 82 on the bottom of the recess 34. In the closed position, the outer mouth of the groove 82 is covered by the nose 72 on the flange 32 of the valve member 26 and sealed.

From the flange 32 of the valve member 26 is a handle bar 46 extending over its half circumference, which can be bent by rotation about a diametrical axis. The handle bar 46 is fastened to the valve member 26 with webs 112, which tear off when they are bent up for the first time and form clearly visible fracture surfaces. This ensures protection of originality.

The handle bar 46 comes to lie sunk in the bung 10. The recess 34 has an extension 114 which extends to the edge of the sheet pintle 10 and in which there is an extension 116 of the handle bracket 46 which projects outwards from the flange 32 and can be gripped under at the edge.

The bent handle 46 serves to turn the valve member 26 from the closed position to the pressure compensation position and back. List of reference numbers

Sheet pile flange tapering section sealing section locking section reinforcement ring bulge central opening valve member ring bead ring bead flange recess sealing section collar beam notch sealing head grip bracket plate outer sealing section inner sealing section front side flange neck flap neck diameter extension radial bore (pressure equalization channel) anchoring head (head) axial extension hole handle 76 circumferential recess (notch)

78 bridge (cams)

80 sealing bead

82 sealing channel (groove)

84 axial opening

86 conical shell section

88 conical shell section

90 conical shell section

92 circular cylindrical shell section

94 circular cylindrical shell section

96 ring bead

98 conical shell section

100 conical sections of jacket

102 conical shell section

104 circular cylindrical shell section

106 circular cylindrical shell section

108 neck

110 jacket groove

112 footbridge

114 extension

116 continuation

Claims

Expectations

1. Closure with pressure compensation valve for the filling opening of a liquid container with a bung sleeve made of soft-elastic material fitting into the round opening, which has a flange-like outer contact part, a circumferential sealing part which seals the edge of the opening, and a circumferential sealing part which engages behind the edge of the opening on the inside

Has locking section and a central opening, and with a manually adjustable valve member, which assumes a sealing closed position and a pressure compensation position in the central opening, in which the interior of the container communicates with the environment, characterized in that in the sealing section (16) and the locking section ( 18) of the bung (10) a coaxial reinforcement ring (20) made of hard plastic is embedded, which is corrugated radially over the circumference and is thus covered in thickness varying over the circumference by the flexible material.

2. Closure according to claim 1, characterized in that the latching section (18) and the reinforcing ring (20) have an identical hook profile over the circumference.

3. Closure according to claim 1 or 2, characterized in that the bung (10) is made in two-plastic injection molding technology.

4. Closure according to one of claims 1 to 3, characterized in that the valve member (26) engages in the closed position and pressure compensation position on the bung (10).

5. Closure according to one of claims 1 to 4, characterized in that the valve member (26) between the closed position and the pressure compensation position in the central opening (24) is rotatable and / or axially displaceable.

6. Closure according to one of claims 1 to 5, characterized in that the valve member (26) has at least one handle (46, 58, 70) for rotating and / or pulling out.

7. Closure according to claim 6, characterized in that the handle (46, 58) against the outside of the bung (10) can be laid flat.

8. Closure according to claim 7, characterized in that the flat handle (46, 58) in a recess (34) of the bung (10) comes to lie sunk.

9. Closure according to claim 8, characterized in that the recess (34) has an extension (74) which allows the flat handle (46) to reach under.

10. Closure according to one of claims 1 to 9, characterized in that it has a tamper-evident protection which shows whether an actuation of the pressure compensation valve has already taken place or not.

11. Closure according to claim 10, characterized in that the valve member (26) is provided with a highly flexible handle (46) which is fastened with webs (112) to the valve member (26), which when first Tear up.

12. Closure according to one of claims 1 to 11, characterized in that the bung (10) has a lateral pressure compensation channel (64) whose outer mouth is above the liquid level in the fully filled container that the valve member (26) from stop limited a clearly predetermined locking position in a clearly predetermined pressure equalization position and back is rotatably adjustable, and that the valve member (26) in the pressure equalization position opens a flow path from the inner mouth of the pressure equalization channel (64) to the top of the bung (10), which it in the closed position cordoned off inside, covering outside and tightly sealed inside and outside.

13. Closure according to claim 12, characterized in that the valve member (26) has an outer flange (32) which fits into a recess (34) of the bung (10) that on the bottom of the recess (34) one of the Central opening (24) leading outward groove (82) is provided, and that the valve member (26) has a shell groove (110) which, in the pressure compensation position, the inner mouth of the pressure compensation channel (64) with the groove (82) on the bottom of the Recess (34) connects.

14. Closure according to claim 12 or 13, characterized in that the flange (32) is non-circular and in the closed position and pressure compensation position with a projection (72) engages radially on the outside of the bung (10), and that the projection (72) in the closed position the outer end of the groove (82) covered the bottom of the recess (34).

15. Closure according to one of claims 12 to 14, characterized in that the valve member (26) is notched over the circumference, and in that the bung-type bushing (10) has a cam (78) which abrades the notch (76) and comes to a stop at its ends in order to limit the setting angle of the valve member (26) and to specify the closed position and pressure equalization position.

16. Closure according to one of claims 12 to 15, characterized in that the part of the valve member (26) opposite the inner mouth of the pressure compensation channel (64) forms a ramp in the circumferential direction which drops in the direction of rotation from the closure position into the pressure compensation position.