ES2256334T3 - VALVE FOR A FOOD PRESERVATION CONTAINER. - Google Patents

Abstract

The valve (1) for the storage container (15) has a connecting device (9) on the opening tap, which has one or more suction apertures. On the outer side of the opening tab there is a smooth all-round edging (18) to receive the sealing lip of the suction connector of a vacuum pump. There may be a sealing tongue acting as a no-return valve between the venting aperture and the opening tab.

Description

Valve for a storage container foods.

The invention relates to a container of food preservation for air tight closure of food to be stored inside the container, with a purge opening provided with a valve and with an arrangement of connection, arranged in the area of the purge opening, for a vacuum pump for the evacuation of the interior of the container, in that the connection arrangement has at least one opening of suction and an essentially smooth edge, which surrounds the opening of suction, for the reception of a sealing lip of a suction connection for the vacuum pump. The invention is also refers to a procedure for air tight closure and the opening of the conservation container.

For food preservation already known systems that allow conservation under better conditions of contour that when food is preserved without treatment or without improved storage conditions. A possibility for the Improved food preservation refers to the conservation of Food in empty containers. It has been shown that this type produce very good results to avoid some microorganisms, insects, mold and fungus growth of yeast. In addition, oxidation of food, which can avoid changes in humidity and the aroma of food.

A conservation container according to preamble of claim 1 is known from the document US 5 735 317 C, in which the vacuum can be established by means of a suction pump and that maintains the vacuum for the conservation of food for a longer period. The conservation vessel has at least one air hole, which can be closed by a metal pressure plate. For opening the container of evacuated preservation a pressure piece with a spring hatch. Pressing the trapdoor down with spring a pressure lever is lowered and through it it turns over the metal pressure plate, so that an air passage is created for the air inlet through the air hole towards the inside of the container The vacuum pump is placed, to evacuate the conservation vessel, above the pressure piece on a coupling flange, which surrounds the air hole and rests on the lid of the storage container. The vessel of known conservation is relatively expensive in terms of structure due to its components necessary for evacuation and the air inlet (spring trapdoor, pressure piece, lever pressure, metal pressure plate).

From the state of the art they are known in addition to lids for food preservation containers, in which is planned for pressure equalization during heating process in a microwave oven a valve purge or air inlet in the lid of the container.

Such a mechanism is described in the EP 0 633 196 A2. Here the problem of avoid the accumulation of overpressure inside containers Food preservation that is heated in a microwave. This occurs most of the time when inside from the vessel there are aqueous liquids, which evaporate during heating and through it establish an overpressure in the inside of the container This is particularly disadvantageous when opening the lid of the container, as this suddenly splashes out sauces or other food components when opening the top. For this purpose, EP 0 633 196 A2 proposes a purge valve on the lid of the storage container food, which must be opened before the introduction of Microwave oven container. The water vapor that produced then during the heating process can escape with it without obstacles, without establishing a corresponding vapor pressure inside the closed container watertight

EP 0 820 939 A1 also has as a basis the task of avoiding the accumulation of overpressure in the inside of food preservation containers, which heat in a microwave, that is to say that in this case you should put available a purge possibility for containers of food preservation, to be able to heat the food there stored safely in a microwave oven, with the  container lid In contrast to EP 0 633 196 A2 describes however a valve mechanism, which can be opened by a joint such as a jogger. With it is simply necessary to press the lever of the swingarm, with which the valve can be opened simply.

WO 88/00560 describes a mechanism of opening for a beverage can made of plastic. Here you must First, there is a pressure equalization by opening of an air inlet valve, through what should an opening or removal of the entire lid is then provided. Here it is always a material cover according to the task synthetic, since precisely the use of caps should be avoided metallic In particular, the compensation of overpressure inside the container, which is caused by example for drinks with carbonic gas.

In addition, US 3,737,066 describes a container that is preferably intended for the conservation of liquids, whose side walls are made of cardboard material coated and whose floor and cover elements are made of plates of synthetic material, which are attached to the walls of liquid-tight cardboard. Material cover synthetic upper here has an opening mechanism that can close again, which is also made of material synthetic and is attached to the lid by continuity of shape by clamping pins No air intake is planned before opening the lid of the container or a device for pressure equalization.

Document CH 304 374 discloses a cover of closure for an aluminum sterilization vessel, which is formed essentially in the form of a circular ring and which is placed on a cylindrical aluminum container. Between the edge of the lid and the upper edge of the container is placed a rubber seal. In the center of the lid of the container is arranged an additional opening, which is covered by a rubber stopper The rubber stopper is used here for control visual, to indicate if there is a vacuum inside the container. While there is a corresponding depression in the inside the container, this rubber cap bulges correspondingly inwards. When the vacuum goes disappearing, this bulge gives way continuously. Thus it is difficult for the observer to decide whether the existing depression inside the container is still enough to ensure the freshness of food inside the container.

US 5,195,427 and WO 97/17259 respectively describe vacuum pumps for the purge of food preservation containers. Here they are introduced respectively suction plugs, which end conically in tip, in corresponding valve openings in the cover of the conservation container

EP 0 234 607 B1 describes a closure bottle that is shaped at the same time as a valve purge. Here a cylindrical vacuum pump is applied, which surrounds completely the cylindrical body protruding from the closure of the bottle.

EP 0 644 128 A1 describes a container that can be sealed tightly, which can be purged by a vacuum pump. Here a valve of retention, which is housed in a cylindrical recess in the lid of the container and into which the suction opening of a vacuum pump.

From document DE-74 09 380 U is known a food preservation container, whose filling opening can be closed by a lid. The lid has in the center an air opening, which can be closed by a valve element The valve element has a lug opening, whereby the valve element is lifted from the purge opening and thus the existing vacuum can be eliminated in the conservation container. A vacuum to establish within preservation vessel is achieved with the valve closed by cooling food after a process of cooking.

From document DE-28 21 852 A1 a conservation container of the type is also known quoted at the beginning, which can be sealed tightly in the air by a cover equipped with a valve. The valve is arranged centrally on the lid and is surrounded by an arrangement of annular connection, on which a vacuum pump can be placed for purging the space for food in the container conservation. To open the storage container, the plate the valve must be lifted from the formed sealing edge on the cover, which can be produced by resorting to a user inserts a knife or other object with a point under the plate valve and push it up. An opening mechanism of This type is comparatively difficult to operate.

The present invention is based on the task of create a food preservation container of the type cited at principle, that can be evacuated easily in terms of structure and technical procedure and that can be opened in the evacuated

This task is solved by a container of food preservation with the characteristics of the claim 1 and a method for air tight closure and the opening of the conservation container with the characteristics of claim 19.

The storage container according to the invention is characterized among other things by the fact that the connection arrangement is formed in a lug of opening, pivotally supported, for valve and edge surrounding is conformed by the side of the opening lug oriented out. Through it on the one hand it is done by means of the opening lug a coupling arrangement with Optimal seal for the suction connection of a pump empty and on the other hand an opening of the valve is possible when The container is subjected to vacuum.

As for the procedure, the invention is characterized among other things by the fact that for the entrance of air is swung out an opening lug, supported pivotally in the storage container, for valve. Through it a simple way can be carried out introduction of air inside the container.

Advantageous structures of the invention are described in the dependent claims.

The conservation container with a device Valve according to claim 1 has the advantage that It can be manufactured simply and economically. In addition, due to the structural configuration of the connection arrangement is not A centering of the vacuum pump is necessary. As a device suction can be used in particular a device with lip of surrounding tightness, which acts like a suction cup. For suction devices of this type it is important that the suction surface of the sealing lip does not have any structure, so that the suction power fully serves for the evacuation of the conservation container. Besides, the suction opening can have inside the surrounding edge smooth an arbitrary cross section. It can also run undulatingly in a circle, it's only important that then also the surrounding sealing lip of the suction device be adapted to this form, to establish a tight connection. By the invention, by establishing the vacuum in the second form The opening lug is pressed by the pump motor driven vacuum against the foot section of the tongue tightness and a pressure gauge so that you get a sealed valve device and at the same time the indicator of Pressure is well visible. In the first embodiment, the opening lug presses against the clamping element, which at its Once you squeeze the gasket securely against the cover of the container. Also here the pressure indication has good visibility.

An advantageous embodiment of the present The invention provides the features of claim 4. A through this, an integrated component with few individual pieces. As soon as the recipient of conservation has been evacuated, the closing effect occurs automatically sealed by the fact that the tongue of tightness is sucked into the purge opening arranged in the container lid

Another advantageous embodiment of the The invention provides the features of claim 5. This embodiment makes available a structural solution surprisingly simple for easy opening of the lid of the container, since first, when pulling up the lug opening, the sealing tab is lifted from the purge opening through the drag element. Through this produces a pressure equalization between the interior of the bowl and surroundings. The lid of the container no longer suffers then aspiration for depression inside the container of conservation and can be easily lifted from it. He Valve device fulfills several functions.

Another advantageous embodiment over the The present invention has the characteristics of the claim 8. Through this the evacuation process is simplified, since the user can see immediately when a sufficient depression in the conservation vessel. By means of the integration of this feature in the valve device is Create a component with multiple functions.

An advantageous improvement of the form of embodiment according to claim 4 provides the characteristics of claim 9. The structuring described there puts arrangement an optically detectable pressure gauge and haptic Here, the optical effect of the manufactured membrane for example of elastomer synthetic material can be increased even in one color signal through a corresponding color setting. Depending on the degree to which the pressure gauge protrudes beyond the outer contour of the valve device or disappears within it for corresponding pressure conditions, can be achieved a corresponding haptic effect, which also allows users with visual impairment allows to detect the state of pressure in the inside the storage container.

Another advantageous further improvement of the form according to claim 5 provides the characteristics of claim 10. Through this a generation is achieved of the unique signal of the pressure gauge. When the pressure in the conservation vessel is that of the environment, the membrane of the Pressure gauge clearly sticks out. To the achieve a predefined depression inside the container, the membrane "jumps" inwards. For a corresponding Spring selection ensures that the membrane jumps again back to its starting position when a minimal depression is overcome in the conservation container, that is there are only two positions of univocal pressure gauge: sufficient depression in the preservation vessel (pressure gauge is introduced) / insufficient depression or ambient pressure (the pressure gauge is in its starting position). The element of spring can be formed here for example by a corresponding selection of a synthetic material with elasticity spring for the pressure gauge membrane or by means of a insertion of an elastic metal part into the membrane of the pressure indicator.

Another advantageous structuring of the invention provides the features of claim 11. Through it it is possible to store the storage container together with the contained in a freezer at low temperature and defrost it to then in a microwave oven. For the process of heating in the microwave can then open the purge opening as described by the lug of opening. Possible materials here are polypropylene and polyamide as well Like any other thermoset and neutral synthetic material Regarding flavors.

Another advantageous embodiment over the The present invention provides for the characteristics of the claim. 12. A material is chosen here that preferably has both a sufficient stiffness as well as sealing characteristics required This component can be manufactured economically as component of synthetic material injection molded and assembled in a simple way in the storage container.

An alternative embodiment provides for characteristics of claim 13. Through this they can fabricate the lid of the container and the opening lug as Joint piece of injection molded synthetic material. For the sealing tab and the pressure gauge membrane a synthetic material or rubber material can be used elastic elastomer, which is then introduced into the formed component  by the lid of the container and the opening lug. Another advantage is that the opening lug serves not only to open the purge opening, but using the film hinge you can the entire lid of the container must also be lifted.

Finally, another advantageous embodiment of the present invention provides for the characteristics of the claim 15. It is advantageous here the flexible arrangement and the universal applicability of the valve device in conjunction with food preservation containers.

The method according to claim 19 It can be carried out simply and quickly. For the few requirements that the procedure poses to the user, is adapted particularly well for the domestic environment. In particular is advantageous that due to the combination of the connection arrangement with smooth edge and suction connection with lip surrounding tightness no expensive centering is necessary before the purge process.

An advantageous improvement of the procedure It is described in claim 20.

Other structuring and advantages of the invention are explained by describing the examples of realization taking into account the attached drawings. In them show:

Figure 1 a schematic representation in cutting of a first embodiment of a container of food preservation with a first valve arrangement in a container lid,

figure 2 a representation in section schematic of the valve arrangement with the pressure gauge  according to figure 1, in which there is a sufficient vacuum in the conservation vessel,

Figure 3 the valve arrangement according to the Figure 1, but after the release of the purge opening by the opening lug, so that in the storage container there is atmospheric pressure again,

figure 4 a perspective representation partially in section of a second embodiment of a food preservation container with a second arrangement valve, in which the pressure gauge has adopted that position in which there is not enough vacuum in the container conservation,

Figure 5 as Figure 4, but with an opening lug pivoted upwards to release the purge opening, so that a pressure equalization can be established in the storage vessel
Y

Figure 6 a perspective representation of a food preservation container with an indicator of pressure according to figure 4.

In the following, same or similar components are designated with equal reference numbers for reasons of simplicity To avoid repetitions, at equal position numbers The same functions and modes of operation must be assigned.

Figures 1 through 3 show a representation schematic section of a first embodiment of a pressure gauge 6 for a storage container 15 (figure 4) food. According to figures 1 to 6, the indicator of pressure 6 is attached to a valve device 1, which is placed in a container lid 2. An opening lug 7 is attached to a piece through a hinge of film 32 to the container lid 2. The opening lug 7 and the lid of container 2 are made of thermoplastic synthetic material and thermostable, as a component of synthetic material molded by injection. The opening lug 7 formed in view from above essentially as an oval plate has an arrangement of connection 9 for a suction connection of a vacuum pump, which is essentially formed by a smooth annular surface 18 on the outer side 24 of the opening lug 7 and one or more suction openings 17 within the annular surface 18.

On the underside of the opening lug 7 it is arranged in figures 1 through 6 below the arrangement of connection 9 a sealing tongue 3 made of material synthetic elastomer. The sealing tongue 3 is fixed in the first embodiment in figures 1 to 3 to the opening lug 7 through a ring-shaped shoulder 19 circular and is formed as an independent component in the form of disk. The shoulder 19 has an air passage 30.

Opening lug 7 is inserted in the Figures 1 to 6, in an essentially rectangular hole 20, correspondingly adapted to the opening lug 7, in the lid of container 2 of the conservation container 15. Under the connection arrangement 9 of the opening lug 7 and of the sealing tab 3 a purge opening 4 is provided in the container lid 2. In the open state, the purge opening 4 establishes the connection between the atmosphere and the interior space 22 of the storage container 15. In the closed state, the purge opening 4 is sealed in the air by the sealing tab 3. The purge opening 4 forms together with the sealing tongue 3 a check valve 40 that closes in the direction of the conservation vessel 15.

Next to the purge opening 4, according to the figures 1 to 6, a measuring opening 5 is arranged in the lid of container 2. The measuring opening 5 is covered from above air-tight form using a synthetic material membrane 29 of pressure gauge 6, being separated from the environment. Pressure gauge 6 extends essentially perpendicular to the plane of the container lid 2 upwards and has according to figures 1, 3, 4 and 5, in the state with a vacuum not made according to the standards, a side wall 23 essentially in cup shape, slightly bulged out, which narrows up and ending with a circular floor 24 that runs horizontally. The diameter D of the floor 24 is smaller than the diameter d of the opening 25 in the foot section 25 of the indicator pressure 6, as shown in particular in figure 4. By described conformation of pressure gauge 6 is achieved in case vacuum load than the side wall 23 of the pressure gauge 6 retracts similarly to a roller membrane to its hollow space 26, as shown in Figure 2.

In the opening lug 7 it is according to Figures 1 through 6 in place of the pressure gauge 6 a indication opening 8, through which the pressure gauge 6 extends perpendicularly beyond the outer side 33 of the opening lug 7, when in the interior space 22 of the conservation vessel 15 there is insufficient depression. He pressure gauge 6 is made of a synthetic material elastomer and preferably in a signal color, in the case present in red. On the inside, the indicator of pressure 6 according to figures 1 to 3 is reinforced by an element elastic 12, which preferably consists of a material with spring elasticity, such as elastic sheet or a material synthetic elastomer, and rests superficially extended on the inner side 34 of the pressure gauge 6.

At the right free end in figures 1 up to 6, the part, which is closest to the edge, of the lug of opening 7 has a drive surface 10. Here, the end of the opening lug 7 is slightly beveled towards above, starting from the bending edge 35. The container lid 2 has the hole 20, so that, like the opening lug 7 it is separated from the floor 37 of the hole 20 through ribs 29, 36, the drive surface 10 of the opening lug 7 can be comfortably grasped between fingers and thumb of a user's hand (not shown) and can be lifted up.

A stirrup is shown in Figures 1 to 3 clamping 11, which tightens the elastomer synthetic material of the foot section 25, which has surface extension, of the indicator of pressure 6 against the container lid 2. The clamping bracket 11 it is supported here on walls, not represented in the drawing, of the cover of container 2. In figures 1 to 3, the pressure gauge 6 bowl-shaped is attached one piece to the foot section 25, so that in the tensioned state by the clamping bracket 11 the pressure gauge 6 is attached with a tight seal to the cover of container 2.

Figures 4 through 6 show a representation in perspective and partially in section of a second form of realization of a valve arrangement 1 with the indicator of pressure 6 according to the invention for a container of 15 food preservation. Also in this embodiment, the opening lug 7 is attached in one piece to the cover of container 2 through the film hinge 32. The tongue of tightness 3, arranged below the connection arrangement 9 of the opening lug 7 is joined by an element of drag 13 to the opening lug 7. Both the tongue of tightness 3 as the drag element 13, the foot section 25 and the pressure gauge 6 are made from a single elastomeric piece of synthetic material, which is fixed as insert in a boss 21 in the recess 20 of the container lid 2. The synthetic material used for the pressure gauge 6 has elastic characteristics here, of so that the mentioned jump effect is also presented here elastic in pressure gauge 6, when there is too little or Enough vacuum

The difference between the first form of embodiment according to figures 1 to 3 and the second form of embodiment according to figures 4 to 6 consists essentially of that in figures 1 to 3 the sealing tongue 3 forms a separate sealing piece with respect to the pressure gauge 6, while on the contrary, in the second form of embodiment according to figures 4 to 6 these pieces are formed by a single elastomer component, whose sealing tongue 3 it is partially cut from the foot section 25 and thus forms a slot 28.

In addition, on the edge of the container lid 2 according to figures 4 and 5 a gasket is provided surrounding tightness 14, which makes a tight seal possible air relative to the conservation vessel 15. It is however also imaginable not to use any seal 14, such as shown in figures 1 to 3, so that the lid itself 2 form a tight seal with the storage container 15. In the closed state of the valve device 1, the foot piece 25 it is pressed by the surrounding nerve 29 against the ground 37 of the container lid 2 and is thus sealed tightly.

In the representation in figures 1 and 3 up 6, the pressure inside 22 of the storage container 15 corresponds to the pressure of the environment. The pressure gauge 6 it stands out because of its initial spring tension across of the indication opening 8 out on the lug of opening 7.

In the representation according to figure 2, there is a sufficient depression inside the container 22 of conservation 15. Pressure gauge 6 is aspirated by it inwards towards its hollow space 26 towards the interior 22 of the container; is in the folded or retracted state elastically In this state, pressure gauge 6 does not excels, or only does it unimportantly, over the outer contour of the opening lug 7. The indicator of Pressure 6 folds up like a roller membrane. Here, the relationship the diameter D a d is chosen based on the wall thickness f and the elastic material of the pressure gauge 6 such that a from a certain depression the pressure gauge 6 is folds sharply, as shown in figure 2. If you reduce the empty inside 22 of the container, a point at which the pressure gauge 6 comes out sharply. This has the advantage of a clear indication.

The way of working of both examples of realization is as follows:

In case of domestic employment, the user can get informed first with the help of the position of the indicator pressure 6, the container lid 2 being closed, about the pressure state inside the container 22. If the floor of pressure gauge 6 protrudes out through the opening indication 8, this means that the pressure inside 22 of the container is not enough to guarantee a storage of food under vacuum conditions (see figures 1, 4 and 6).

Now, conservation container 15 is evacuated according to figures 1, 3 and 6. In the evacuation process place a suction connection, with sealing lip surrounding, of a vacuum pump (not shown) on the connection arrangement 9 of the valve device 1. Then, the Vacuum pump starts up. Through it it opens automatically the drain opening 4 of the valve device 1, since the suction effect allows the tongue to be lifted sealing 3 with respect to the purge opening 4 and the air contained in the storage container 15 is aspirated by the vacuum pump. According to Figure 1, air is drawn through the purge opening 4, passing laterally next to the seat of sealing 38 of the sealing tongue 3, on the outside in around the sealing tongue 3, through the air passage 30 and through connection arrangement 9 towards the vacuum pump. When sufficient depression is reached in space 22 of the conservation vessel 15, pressure gauge 6 jumps elastically sharply inwards (figure 2). Through In this way, the user is informed that he can finish the process of evacuation. After lifting the vacuum pump from the connection 9, the sealing tongue is pressed on the edge of the purge opening 3, whereby this is automatically closed tightly in the air. This process also occurs. for each recoil stroke of the vacuum pump, so you can establish a vacuum in the inner space 22. The vacuum in the inner space 22 then keeps food, which is they find there, fresh for a long time, since the absence of Oxygen prevents oxidation of food.

In order to get fresh food from the container of conservation 15, it is grasped with two fingers below the surface drive 10 and is pivoted with a force application small opening lug 7 in figure 5 in direction counter clockwise. Here, according to figure 3, the sealing tab 3 is lifted from the sealing seat 38 upwards through the opening lug 7 through the projections 19, and the purge opening 4 is released. In the example of embodiment according to figure 5, first bumps the upper side of the opening lug 7 against the bottom side of a flange 27  formed in the drag element 13, and pulls the element of drag 13 with the sealing tongue 3 upwards until that the sealing tongue 3 is lifted from the seat of tightness 38 and pivots upwards in the opposite direction clockwise (figure 5). The air can now enter according to Figures 1 through 5 through the suction opening 17 of the connection arrangement 9 and purge opening 4 inwards 22 of the container.

The container lid 2 can now be separated without an effort worth mentioning of the conservation vessel 15. As the sealing tongue 3 according to figures 4 and 5 is partially separated from the remaining foot piece 25, which has surface extension, through the groove 28 which essentially runs U-shaped, and therefore is only attached in the rear area left 39 to the rest of the foot section 25, falls due to its weight as a check valve over and over the drain opening 4, so that a vacuum generation does not represent any trouble. It is however also imaginable that the lug of opening 7 can be snapped by elastic jump into the lid of container 2 by clamp joints, so that in the state closed the sealing tongue 3 close through it the purge opening 4. In Figure 3, by swinging the lug of opening 7 around the film hinge 32, the tongue of tightness 3 is raised together upwards as it is loosely attached to the opening lug 7 to perform the check valve function.

Figure 6 shows a representation in perspective of a food preservation container 15 made of thermoplastic synthetic material with a valve arrangement 1 according to figure 4. The storage container 15 has here a parallelepiped shaped container body 16 and a lid of container 2 essentially shaped rectangular in view from above with a surrounding flange 27. On one side narrow of the container lid 2, the valve device 1 is arranged in a gap 20. Here, the drive surface 10 of the opening lug 7 closes approximately with the outer surface 33 of the container lid 2. Simply the pressure gauge 6 protrudes, for insufficient vacuum, from the indication opening 8 of opening lug 7 perpendicularly up. Inland direction 22 of vessel can be seen next to pressure gauge 6 the connection arrangement 9 circularly shaped with the annular surface 18 smooth and the suction opening 17, from which the drag element 13 protrudes with its flange 27. The flange 27 serves for a better drag of the drag element 13, when the opening lug is swung up 7. By means of the lever action, which is formed by the distances R and r (figure 5), a relatively small manual force F is sufficient (figure 4), to lift the sealing tab 3 of the seat tightness 38, when there is still empty inside 22 of the container. The smaller the distance r and the greater it becomes then the distance R, the more easily the valve arrangement 1.

Claims (20)

1. Storage container (15) for air-tight closing of food to be stored inside (22) of the container, with a drain opening (4) equipped with a valve (1) and with a connection arrangement (9 ), arranged in the area of the purge opening (4), for a vacuum pump for the evacuation of the interior (22) of the container, in which the connection arrangement (9) has at least one suction opening (17) and an essentially smooth edge (18), which surrounds the suction opening (17), for receiving a sealing lip of a suction connection for the vacuum pump, characterized in that the connection arrangement (9) is formed in an opening lug (7), pivotally supported, for the valve (1) and the surrounding edge (18) is formed on the side, facing outwards, of the opening lug (7). 2. A storage container according to claim 1, characterized in that air can enter the storage container (15) by pivoting the opening lug (7). 3. A storage container according to claim 1 or 2, characterized in that a sealing tongue (3) of the valve (1) is arranged below the connection arrangement (9) of the opening lug (7). 4. A storage container according to claim 3, characterized in that the sealing tongue (3) forms a check valve (40) with the drain opening (4), which closes the drain opening (4) in the direction of the interior ( 22) of the container
tea. 5. A storage container according to claim 3 or 4, characterized in that the opening lug (7) has a drag element (13, 19), which, by swinging the opening lug (7) lifts from the purge opening ( 4) the sealing tab
(3). 6. Storage container according to one of claims 3 to 5, characterized in that the sealing tongue (3) is made of elastomeric synthetic material. 7. A storage container according to claim 6, characterized in that when a sufficient vacuum is reached to keep the food fresh, the sealing tongue (3) inside (22) of the container can be aspirated by sealing tightly over the purge opening (4). 8. A storage container according to one of the preceding claims, characterized in that a pressure gauge (6) is provided on the valve (1). 9. A storage container according to claim 8, characterized in that the pressure indicator (6) is formed as a dome-shaped membrane. 10. A storage container according to claim 9, characterized in that the pressure gauge membrane (6) has an elastic element (12), so that the pressure gauge (6) jumps elastically back to its starting position for a preset pressure. 11. Storage container according to one of the preceding claims, characterized in that the valve (1) is made of synthetic material, which is suitable for a temperature range of -40 ° C to + 100 ° C. 12. Storage container according to one of claims 8 to 11, characterized in that the sealing tab (3), the drag element (13) and the pressure gauge (6) are made as a single-piece component. 13. Storage container according to one of the preceding claims, characterized in that the opening lug (7) is connected through a hinge of film (32) of a piece with the container lid (2) of the storage container (15) ). 14. A storage container according to one of claims 1 to 12, characterized in that the opening lug (7) can be snapped into the container lid (2) by means of clamp connections. 15. Storage container according to one of the preceding claims, characterized in that the valve (1) is arranged in the container lid (2) or in the container body (16) of the conservation container (15). 16. Storage container according to one of the preceding claims, characterized in that the opening lug (7) is inserted in an essentially rectangular hole (20) in the container lid (2). 17. Storage container according to one of the preceding claims, characterized in that at its free end of the opening lug (7) its part closest to the edge has an actuation surface (10). 18. Conservation container according to one of the preceding claims, characterized in that the end of the lug (7) is slightly bevelled upwards, starting from a bending edge (35). 19. Method for air-tight closure and opening of the food container (15) according to one of the preceding claims, wherein a valve (1) and a connection arrangement are placed in the food container (15) (9) for a vacuum pump, in which the valve (1) is automatically opened by the vacuum pump suction effect, and after disconnection of the vacuum pump it is automatically closed, in which before opening the evacuated conservation container (15) enters air into the interior (22) of the container, characterized in that an opening lug (7), pivotally supported on the conservation container (15) is pivoted outwardly for the air inlet. , for the valve (1). 20. Method according to claim 19, characterized in that prior to the process steps for evacuation, the vacuum pump is connected as an apparatus connectable to a rod mixer or manual stirrer that drives the vacuum pump.