EP1937574B1 - Pressurised fluid product dispenser - Google Patents

Description

The present invention relates to a pressurized fluid product dispenser comprising an external canister, an internal flexible bag and a valve mounted on an opening of the bag. An intermediate space is thus created between the can and the bag and this intermediate space is intended to be at least partially filled with a gas under pressure so as to exert pressure on the flexible bag. Thus, by actuating a movable member of the valve, the fluid product stored under pressure inside the bag can be dispensed through an outlet formed by the valve. This is a conventional dispenser in many fields of application, such as cosmetics, pharmaceuticals, body care products, food, etc.

With this particular type of pressurized fluid dispenser, it is necessary to perform at least two filling operations, namely a gas filling operation in the intermediate space defined between the can and the bag, and an operation of fluid filling inside the pocket. Conventionally, these two distinct filling operations are carried out through the valve, and more precisely through the outlet of the valve. This valve outlet may be formed by the free end of a hollow valve stem, internally defining an outlet conduit, or alternatively, this valve outlet may be formed by an orifice for receiving a connecting sleeve, formed by a dispensing head which is pressed to actuate the valve. In either case, gas and fluid are injected through the valve outlet. It is therefore essential that the gas finds a passage from the valve outlet to the intermediate space without penetrating inside the pocket. In a symmetrical manner, the fluid product injected through the valve outlet must find a passage from the valve outlet to the pocket without penetrating the intermediate space. It is therefore necessary to create two separate passages, namely a passage for the gas to the intermediate space and a passage for the fluid to the flexible bag.

In the prior art, these two separate passages may for example be generated by a valve located inside the valve. This valve is adapted to open from a certain predetermined pressure threshold. Thus, the gas can be injected into the intermediate space with a pressure lower than the predetermined threshold, while the fluid product can be injected into the pocket with a pressure greater than the predetermined threshold. This is a first filling technique. However, this technique requires precisely determining the injection pressures of the gas and the fluid product so as not to mix the gas and the fluid in the intermediate space and / or in the pocket. Another conventional technique is to use the movable member of the valve to temporarily seal the passageway communicating the valve outlet and the bag. For this purpose, it is conventionally provided to drive the movable element fully into the interior of the valve, so that it comes into sealing abutment with a fixed element of the valve. Temporary sealing is thus performed, so that the gas can then be injected into the intermediate space without risk of entering the pocket. Then, by slightly releasing the movable member of the valve, the closure made is broken, so that the fluid can then be injected into the pocket. Again, it is necessary to perform a particular operation, namely fully push the movable member of the valve, to achieve the closure of the passage, communicating the valve outlet with the interior of the flexible bag. If the movable element is not fully pressed, the shutter is incomplete or deficient, so that gas then enters the flexible bag. Therefore, no filling technique of the prior art is fully satisfactory for this particular type of dispenser.

On the other hand, it is also often necessary to carry out an evacuation operation of the flexible bag to allow its introduction inside the outer can. This conventional evacuation is done by emptying the pocket of its contents which is air. The pocket then crashes on itself so that it is very easy to fold it or to wind it on itself. Once folded or rolled, the bag is held in this position by a small strip which is adapted to break during filling of the bag. The pocket can thus be easily introduced into the can. Without this prior emptying operation of the bag, it can not be folded or rolled, so that its introduction into the can is very difficult. Therefore, this prior operation of emptying the pocket is essential in most cases. For this, it is necessary that the passage connecting the outlet of the valve to the bag is open, so as to suck the contents of the bag through the open valve from its output.

The evacuation or emptying of the bag is usually performed by the manufacturer of the valve and the bag before shipment to the filler gas and fluid. The dispenser bag is thus delivered in its folded or wound state, so that the gas and fluid filler can easily introduce the bag into the can, and fix the valve on the edge of the can, for example using a fixing cup. During the gas filling operation, the bag remains folded or rolled up, and it is only when filling the bag with the fluid that the bag will unfold and occupy a substantial part of the internal volume of the can, the other part of the can being occupied by the gas under pressure.

Therefore, with this particular type of pressure distributor, it is necessary at first that the passage connecting the outlet of the valve to the pocket is open to allow evacuation of the pocket, it is necessary in a second time to close the connecting passage the outlet of the valve to the pocket to allow the filling of the intermediate space with a gas under pressure, and it is finally necessary that the passage connecting the outlet of the valve to the bag is again open to allow the filling of the bag with a fluid to be dispensed. It has been seen above that the filling techniques in gas and fluid product of the prior art are not fully satisfactory.

The document US 2004/0 251 272 discloses a pressurized fluid product dispenser according to the preamble of claim 1.

The present invention aims to overcome the aforementioned drawbacks of the prior art by defining a fluid dispenser under pressure in which the gas filling and fluid filling operations, as well as possibly the evacuation operation of the pocket, are particularly simple and without risk of mixtures of gas and fluid product. Another object of the present invention is to allow these easy filling operations while not substantially complicating the structure of the valve. This valve must be able to be produced at a relatively small cost.

To achieve these objects, the present invention provides a fluid dispenser under pressure comprising a substantially rigid outer container, an internal flexible pouch for containing a fluid, the bag being disposed in the container so as to define an intermediate space between the can and the bag, this intermediate space being intended to be at least partially filled with a pressurized gas so as to exert pressure on the flexible bag, a valve mounted on an opening of the bag, the valve comprising an actuatable movable element of so as to allow the pressurized fluid product to be dispensed through an outlet of the valve, the dispenser further comprising closure means adapted to close the passage between the bag and the valve outlet, regardless of the pressure at the of the valve outlet and / or actuation of the movable member. Thus, it is not necessary to play on the injection pressure of the gas and / or the fluid product to make operable or inoperative the sealing means. Likewise, moving of the movable member of the valve is completely inoperative on the closure means in their closed condition of the passage between the bag and the valve outlet. In other words, the closure means seal the passage between the bag and the valve, without it being necessary to act on the movable member of the valve or to adjust the injection pressure of the gas and / or fluid product. The sealing means seal the passage between the bag and the valve, even when the valve is at rest, and subjected to no particular pressure, other than the atmospheric pressure. Advantageously, the movable element engages with the closure means, at the end of travel of the movable element, to break or undo the closure generated by the closure means and thus release the passage between the pocket and the valve outlet. Unlike the techniques of the prior art in which the movable member is used to effect the closure of the passage, in the present invention, the movable member is used to break or undo the closure of this passage.

According to an advantageous embodiment, the closure means comprise two parts initially connected in a sealed manner, these parts being able to be separated from one another, thus making it possible to establish a passage between the pocket and the exit of valve. Preferably, the movable member engages one of the parts to separate it from the other end-of-travel part of the movable member.

According to another characteristic of the invention, the valve comprises a return spring which returns the valve in the closed position, the spring bearing on the closure means Advantageously, the spring bears on a part of the closure means which comes resting on a stop formed by a pocket support on which the opening of the pocket is fixed.

According to another advantageous aspect of the invention, the valve comprises a fixed valve body and a movable valve stem, the valve outlet being formed by a free end of the valve stem, the means shutter being movable relative to the body between a non-sealed initial position and a sealed end position. Advantageously, the sealing means are biased in sealing engagement against the body. Preferably, the opening of the bag is fixed on a pocket support engaged with the valve body, the support being movable relative to the body so as to urge the sealing means sealingly against the body. In the initial unsealed position, it is possible to evacuate or empty the contents of the pocket to be able to fold or wind it. Once the closure means have been moved to their final sealed position, it is possible to fill the gap with pressurized gas. Once this gas filling step is performed, it is then necessary to undo or break the closure generated by the closure means to allow the injection of the fluid into the flexible bag.

According to an advantageous embodiment, the sealing means comprise a ring intended to bear tightly against the body and a plug disposed in the ring, the cap and the ring being sealingly connected before their separation. Advantageously, the cap and the ring are made integrally by being connected together by a bridge of material capable of breaking to allow their separation. Alternatively, the cap rests tightly on the crown before their separation. The ring and the plug, while sealed together, can be moved in one piece from the unsealed initial position to the sealed end position. Then, it is possible to separate the plug of the ring, either by breaking the material bridge, or by disengaging the cap of the ring, which can advantageously be achieved by means of the movable element when it arrives at the end of race. One can also imagine that the movable element pierces or punches the plug which then remains attached to the crown.

The invention also relates to a method of filling a fluid dispenser as defined above, the method comprising the steps of: filling the intermediate space with gas under pressure, while the closure means prevent any passage between the valve outlet and the bag, to actuate the valve so as to break the closure means to create a passage between the bag and the valve outlet, then fill the bag through the valve.

Advantageously, the method comprises the initial step of evacuating the contents of the valve, while the sealing means are in initial unsealed position. Preferably, the method comprises exerting a thrust on the pocket support between the gas evacuation and filling steps to bring the closure means to the sealed end position.

An interesting feature of the invention that can be independently protected is that the displacement of the pocket support relative to the body of the valve is used to seal the passage connecting the outlet of the valve to the valve. poached. This shutter operation is advantageously performed after the evacuation operation of the pocket. The passage being thus closed, the filling of gas is possible. Then, it is the deep depression of the movable member of the valve that allows to break, break, or undo the closing of the passage between the valve outlet and the pocket.

The invention will now be further described with reference to the accompanying drawings, giving by way of non-limiting examples several embodiments of the invention.

• Les figures 1a, 1b, 1c, 1d, 1e et 1f représentent divers stades d'assemblage et de remplissage d'un distributeur de produit fluide sous pression selon un premier mode de réalisation de l'invention,
• Les figures 2a et 2b correspondent aux figures 1e et 1f pour un second mode de réalisation de l'invention, et
• La figure 3 est une vue correspondant à la figure 1d pour un troisième mode de réalisation de l'invention.

In the figures:

• The Figures 1a, 1b, 1c , 1d, 1e and 1f represent various stages of assembly and filling of a fluid dispenser under pressure according to a first embodiment of the invention,
• The Figures 2a and 2b correspond to Figures 1e and 1f for a second embodiment of the invention, and
• The figure 3 is a view corresponding to the figure 1d for a third embodiment of the invention.

We will first refer to Figures 1a to 1f to explain in detail the structure and operation of the pressure fluid dispenser according to the first embodiment of the invention. Other embodiments of the Figures 2a, 2b and 3 have a structure and operation substantially identical to those of the first embodiment, with the exception of the closure means.

The figure 1a will serve as a basis for describing in detail the structure of the distributor, and more particularly of the valve, which is designated as a whole by the digital cooling 3. In addition to this valve 3, the device also comprises a substantially rigid outer container 1, which can for example be made of metal or plastic. The dispenser also includes a flexible pouch 2 which can be made of any flexible material, such as plastic, metal or a laminated complex of plastic and metal. The dispenser also comprises a fixing cup 4 which serves to hold the valve 3 on the can 1.

Returning to figure 1a , the valve 3 comprises a valve body 31 having a substantially cylindrical or tubular general configuration. At its upper part, the body 31 forms a flange 301 intended to engage inside a housing 43 formed by the fixing cup 4. This housing 43 is partially closed on the top by a flange 42 which defines a central opening. On its outer periphery, the attachment cup 4 forms a fixing ring 41 intended to be crimped on the can 1. More particularly, as can be seen on the figure 1e , the can forms an edge 11 defining an opening which gives access to the inside of the can. According to a conventional embodiment, the edge is The fixing ring 41 is advantageously crimped onto this hemmed edge 11. To ensure the seal, the ring may be provided with a flat seal which extends over the entire periphery of the ring, which is crashing on the top of the hem edge 11. This is a quite conventional feature for attaching a valve cup to an external can

The valve body 31 also forms an interior shoulder 312 which is oriented downward and which is located on an inner periphery of the body. Below this shoulder 312, the body 31 forms a skirt 313 which is advantageously provided at its inner wall with several attachment profiles.

The valve 3 also includes a valve seal 33 which is disposed within the body 31 just below the flange 42 formed by the cup 4. The valve seal 33 is a flat seal defining a central opening which is disposed of concentrically with that of the flange 42.

The valve 3 also includes a valve stem 32 which extends substantially axially through the passage openings formed by the valve seal 33 and the flange 42. The valve stem 32 extends upwardly and comprises a free upper end which defines an outlet 321 of the valve. It is through this outlet 321 that the first pressurized fluid inside the distributor leaves the valve 3.

Below the valve stem 32, the valve 3 defines a movable cap 34 which is urged against the valve seal 33 by a return spring 35. The movable cap 34 defines a lip 343 which is pushed into sealing contact under the seal The spring 35 also pushes the movable cap 34 into pressed contact against the valve stem 32. It may be envisaged to make the valve stem 32 and the movable cap 34 integrally: however, in practice these two pieces are often made separately.

The valve 3 is also provided with a pocket support 36 on which an opening 21 of the bag 2 is sealed, for example by welding. This pocket support 36 comprises a sleeve 361 engaged within the skirt 313 of the valve body 31. The sleeve 361 of the pocket support 36 is also provided with hooking profiles intended to engage the profiles of the body. corresponding hooking, formed inside the skirt 313 of the valve body 31. According to the invention, the sleeve 361 can be received inside the skirt 313 at different heights, so that it is possible axially displacing the pocket support 36 relative to the body 31. In addition to this sleeve 361, the pocket support 36 also forms a bearing flange 362 which extends radially outwardly from the lower end of the sleeve 361. Below the flange 362, the pocket support 36 forms a fastener 364 on which the opening 21 of the pocket 2 is fixed, for example by welding. Internally, the pocket support defines an axial central passage duct which passes through the plastic sleeve 61 and the attachment ferrule 364. According to a feature of this pocket support 36, one or more stops 363 are formed inside the support. . For example, these stops may be made by ribs that extend radially inwardly. These ribs, however, do not obstruct the axial passage formed by the pocket support 36.

According to the invention, the valve 3 is further provided with closure means 5 which are able to close the passage which makes the bag support 36 communicate with the dispensing outlet 21 of the valve. These sealing means 5 are here partially disposed inside the sleeve 361 of the bag support 36 resting on the upper end of this sleeve. Referring to the figure 1a , it can be seen that these sealing means 5 comprise a sealing ring 51 in non-sealing support on the upper end of the sleeve 361 and a plug 52 which extends inside the ring 51 and to the inside the sleeve 361, without come into tight contact with it. It may also be noted that the sealing ring 51 is disposed below the shoulder 312 of the body 31 without being in contact therewith. It may also be noted that the ring 51 is not in sealing contact with the skirt 313 of the body 31. Therefore, in the position of the figure 1a , there is a passage that bypasses the sealing means 5, which therefore still play their role of shutter. Indeed, by pressing lightly on the valve stem 32, it is possible to communicate the dispensing outlet 321 with the inside of the pocket holder 36, and thus with the inside of the pocket 2. D ' on the other hand, it may also be noted that the return spring 35 bears directly at its lower end on the closure means, and more precisely inside the plug 52, which here has a cup shape.

The sealing means 5 are here advantageously made in one piece, the ring 51 being in fact integrally connected to the cap 52 by a bridge of brittle material 53 which extends over the entire outer periphery of the button 52.

We will now refer to the figure 1b which shows a subsequent assembly step, of fixing the opening 21 of the pocket 2 on the attachment end 364 of the pocket support 36. The fixing is performed most often by welding. It may also be noted in this figure that there is a passage 54 between the plug 52 and the sleeve 361. This passage continues at its upper end extending around the ring 51 which is not in sealing contact with the skirt 313 of the body 31.

The figure 1c illustrated a subsequent step of assembling the dispenser, consisting of moving the pocket support 36 relative to the body 31. For this, one uses the flanges 362 to exert a thrust in the direction of arrows annotated "PUSH". This has the effect of raising the sleeve 361 inside the skirt 313. The end of the sleeve 361 pushes thereby the crown 51 towards the shoulder 312. When the sleeve 361 is fully pressed into the skirt 313, the upper edge of the ring 51 comes into sealing contact against the shoulder 312 formed by the body 31. This is represented on the figure 1d . The closure means 5 have thus been moved from a non-sealed initial position to a sealed end position. Indeed, in the configuration of the figure 1d , the sealing means 5 sealingly close the passage connecting the bag 2 to the valve outlet 321. The seal is made at the contact of the ring 51 against the shoulder 312. In addition, the means of 5 are perfectly sealed, since the ring 51 is sealingly connected to the plug 52.

Let's go back quickly to the configuration of the figure 1c in which the sealing means 5 are in the initial unsealed position, ensuring a passage between the bag 2 and the valve stem 32. In this configuration, it is possible to evacuate or empty the contents of the bag 2, which is conventionally air. This is done by connecting the valve stem 32 to a vacuum pump. The air thus evacuated passes through the pocket support 36 all around the cap 52, around the ring 51 all around the movable cap 34 to reach the level of the lateral bore 322 formed by the valve stem. From there, the evacuated air rises inside the valve stem and passes through the exit 321. Once this evacuation operation is completed, the pocket 2 can be folded on itself or wound on it and maintained in this compact position with a tear strip. It is then possible to carry out the thrusting operation of the pocket support, so as to bring the sealing means 5 into the final sealed position shown on FIG. figure 1d .

The dispenser, or more precisely the valve 3 equipped with its cup 4 and provided with its pocket 2, is thus sent to people who will fill the gas or fluid. We can notably notice that the bag 2, which has been removed from its contents, is maintained anyway in this empty state because the closure means 5 seal the passage between the bag and the valve outlet 321. It is not It may not be necessary to keep the pouch folded or rolled up using a tear tape. Indeed, the pocket remains in this configuration, since it is isolated from the outside by the closure means 5. This is a characteristic that can be protected in itself. More specifically, the sealing means 5 can be used in a valve for the sole purpose of initially allowing the evacuation of the bag 2 and then the isolation of the bag 2 relative to the outside. The fact that the closure means 5 are movable between a non-sealed initial position and a sealed end position is itself a protectable feature. The displacement of the sealing means is here carried out using the pocket support which is mounted axially displaceable with respect to the valve body.

The valve thus fully equipped as shown on the figure 1d , can be mounted in a can 1, by engaging the fixing ring of the cup 4 on the edge 11 of the can. This is possible because the bag 2 is kept in its folded or rolled compact state. It is then sufficient to crimp the crown 41 on the edge 11 to make a tight connection of the cup 4 on the can. The effective internal volume of the can 1 is thus partially occupied by the folded or wound pocket 2, the valve 3 and an intermediate space E located between the can and the pocket 2. This intermediate space E will serve as a receiving space for the gas thruster under pressure. Indeed, in this particular type of fluid dispenser under pressure, the propellant gas is not mixed with the product to be dispensed, but stored in an intermediate space that surrounds the bag. The pressurized gas stored in this intermediate space E thus exerts pressure on the bag 2 and its contents are then pressurized.

The filling step of this intermediate space E with a pressurized gas G can be performed while the dispenser is in the configuration shown in FIG. figure 1e . In this configuration, the closure means 5 seal the passage communicating the interior of the bag 2 with the dispensing outlet. By injecting pressurized gas G with a sealed bell 6 through the valve stem 32, the gas enters the rod and then passes through the side bore 322 to get around the rod. Then, the gas finds a passage between the flange 42 and the valve seal 33. From there, the gas flows around the body 31 as indicated by the arrows. Finally, the gas is in the intermediate space E. With the closure means 5, there is no risk that the gas enters the inside of the bag 2. The gas can be injected safely to the interior of the intermediate space E. Once this operation is completed, the bell 6 is removed, and the valve stem 32 returns to its initial sealed position 2. Sealing is in fact ensured by the lip 343 which bears against the valve seal 33.

It is then possible to proceed to the fluid product filling step as shown in FIG. figure 1f . For this, the sealing means 5 are first broken by separating the ring 51 from the plug 52. This is done by means of the movable member 34 which is provided with a support bushing 345 intended to to engage with the plug 52. By pressing the valve stem 32 down fully, the movable member 34 will push on the plug 52, which will cause the rupture of the bridge of brittle material which connects the ring 51 and the plug 52 The separation of the closure means into two distinct parts separated and spaced apart from each other makes it possible to ensure a passage between the inside of the bag 2 and the valve stem 32. Indeed, the passage 54 formed between the plug 52 and the sleeve 361 allows the passage of the fluid as soon as the valve is open. It may be noted that the plug 52, once separated from the ring 51, comes to rest on the stops 363 formed by the pocket support. The plug 52 is held in a perfectly stable manner on these stops 353, since it is urged by the return spring 35. Once the closure means have been separated, a bell 6 can be brought back onto the valve stem. 32 and inject fluid product F into the valve which is held slightly open. The fluid product can flow inside the bag since the sealing means no longer seal.

Thanks to the shutter means 5, the gas and fluid filling operations can be performed safely without the risk of mixing the gas and the fluid product. A slight actuation of the valve stem 32 is not sufficient to break the closure means. For this, it is necessary to push down and exert enough pressure to separate the cap 52 of the ring 51. In addition, thanks to the displacement of the pocket support relative to the body, one can easily evacuate the pocket while the means of shutter does not yet provide sealing.

We will now refer to Figures 2a and 2b which illustrate an alternative embodiment. The Figures 2a and 2b correspond to Figures 1e and 1f of the embodiment, illustrating gas filling and fluid filling operations respectively. The sealing means 5 'here consist of two separate parts, namely a ring 51' and a plug 52 '. The ring and the plug are made separately and the plug 52 'is attached to the inside of the ring 51'. The plug 52 'forms a peripheral annular bead 521 which extends radially outwardly. This cord 521 provides sealingly on an inner peripheral edge 511 formed by the ring 51 '. In the configuration shown on the figure 2a , the plug 52 'is in sealing contact with the ring 51', so that the sealing means 5 'intersect the passage connecting the inside of the bag 2 to the valve outlet, just as the sealing means 5 of the first embodiment. The gas can then be injected through the valve stem to fill the intermediate space E defined between the can and the pocket.

After this gas filling step, it is sufficient to fully push the valve stem to separate the cap 52 'of the ring 51'. This is represented on the figure 2b . Fluid can then be injected through the valve to fill the pouch 6. The product will flow between the cap 52 'and the sleeve formed by the pouch holder, as in the first embodiment.

We will now refer to the figure 3 which illustrates a third embodiment in which the shutter means 5 "also comprise a ring 51 and a plug 52, which are here permanently connected in a one-piece manner.The cap 52 forms a pierceable membrane 55 which can be pierced when the the movable cap 34 is fully depressed. For this purpose, the movable cap 34 forms a piercing needle 346 capable of piercing or cutting the membrane 55 formed by the sealing means 5 ". It should be noted that in this embodiment, the valve is devoid of valve stem and the valve outlet 321 is directly formed at the seal 33 and cup flange. This valve is more particularly adapted to be associated with a dispensing head which comprises a sleeve which will bear against the movable cap 34.

An interesting principle of the present invention resides in the fact that the closure means fulfill their shutter function independently of the pressure of the injected fluid gas and independently of the actuation of the valve. On the other hand, the maximum actuation of the valve is necessary to break the sealing means.

The valve stem and / or the movable cap 34 together or individually constitute a movable member of the valve on which one can act to actuate the valve. It is of course possible to remove the stem first and second embodiment of the valve and equipping the valve of the third embodiment of a valve stem.

The sealing means of the invention thus successively provide a passage for carrying out the evacuation of the bag, a sealed seal for injecting the gas under pressure, again a passage for injecting the fluid product. However, it is possible to dissociate or delete the first unsealed initial state to evacuate the bag, so that the sealing means serve only for filling gas and fluid filling.

Claims (15)

1. A pressurized fluid product dispenser comprising:

   - a substantially rigid external can (1),

   - an internal flexible bag (2) intended to contain a fluid product F, the bag being positioned in the can (1) so as to define an intermediate space E between the can and the bag, this intermediate space E being intended to be at least partly filled with a pressurized gas G so as to exert pressure on the flexible bag,

   - a valve (3) mounted on an opening (21) of the bag (2), the valve comprising a mobile component (32, 34) which may be actuated so as to allow the pressurized fluid product to be dispensed through an outlet (321) of the valve,

   characterized in that it further comprises sealing means (5; 5'; 5") distinct from the valve (3), these sealing means being capable of sealing off the passage between the bag and the valve outlet, independently of the pressure at the valve outlet and/or of the actuation of the mobile component.
2. The fluid product dispenser according to claim 1, wherein the mobile component (34) will engage with the sealing means, at the end of travel of the mobile component, in order to break the seal generated by the sealing means and thereby clear the passage between the bag and the valve outlet.
3. The fluid product dispenser according to claim 1 or 2, wherein the sealing means (5; 5') comprise two portions (51, 52; 51', 52') initially connected together in a sealable manner, these portions being capable of being separated from each other, thereby allowing a passage to be established between the bag and the valve outlet.
4. The fluid product dispenser according to claim 3, wherein the mobile component (34) will engage with one (52; 52') of the portions in order to separate it from the other portion at the end of travel of the mobile component.
5. The fluid product dispenser according to any of the preceding claims, wherein the valve comprises a return spring (35) which brings the valve back into the closed position, the spring being supported on the sealing means.
6. The fluid product dispenser according to claim 5, wherein the spring (35) is supported on a portion (51; 51') of the sealing means which will rest on an abutment (363) formed by a bag support (36) on which the opening (22) of the bag (2) is attached.
7. The fluid product dispenser according to any of the preceding claims, wherein the valve comprises a fixed valve body (31) and a mobile valve rod (32), the valve outlet (321) being formed by a free end of the valve rod, the sealing means being displaceable relatively to the body between an initial non-sealed position and a final sealed position.
8. The fluid product dispenser according to claim 7, wherein the sealing means are urged to press against the body in a sealable manner.
9. The fluid product dispenser according to claim 7 or 8, wherein the opening (22) of the bag (2) is attached on a bag support (36) engaged with the valve body (31), the support being displaceable relatively to the body so as to urge the sealing means to press against the body in a sealable manner.
10. The fluid product dispenser according to any of claims 7 to 9, wherein the sealing means comprise a crown (51; 51') intended to press, in a sealable manner, against the body (31) and a plug (52; 52') positioned in the crown, the plug and the crown being connected in a sealable manner before their separation.
11. The fluid product dispenser according to any of claims 10, wherein the plug (52) and the crown (51) are made in one piece by being connected together through a material bridge (53) capable of breaking in order to allow their separation.
12. The fluid product dispenser according to claim 10, wherein the plug (52') rests on the crown (51') in a sealable manner before their separation.
13. A method for filling a fluid product dispenser according to any of the preceding claims, comprising the following steps:

    - filling the intermediate space E with pressurized gas G, while the sealing means prevent any passage between the valve outlet and the bag,

    - actuating the valve so as to break the sealing means in order to create a passage between the bag and the valve outlet,

    - filling the bag through the valve.
14. The filling method according to claim 13 when it depends on claim 3, comprising the initial step for discharging the contents of the valve, when the sealing means are in the initial non-sealed position.
15. The filling method according to claim 14 when it depends on claim 5, comprising exerting a thrust on the bag support between the gas discharge and filling steps in order to bring the sealing means into the final sealed position.

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