EP3352915A1

EP3352915A1 - Non-return valve

Info

Publication number: EP3352915A1
Application number: EP16795111.0A
Authority: EP
Inventors: Géry DAMBRICOURT
Original assignee: CEP TUBES
Current assignee: CEP TUBES
Priority date: 2015-09-22
Filing date: 2016-09-22
Publication date: 2018-08-01
Anticipated expiration: 2036-09-22
Also published as: FR3041409A1; US10569285B2; WO2017051125A1; FR3041412A1; WO2017051086A1; FR3041412B1; EP3352915B1; EP3352912B1; CN109070115A; CN109070115B; US20190076862A1; EP3352912A1

Abstract

The present invention relates to a pump (1) made up of a deformable tube (6) having an inlet orifice (61) closed off by an inlet valve, an outlet orifice (62) and an outlet valve. According to the invention, the pump comprises the following: - the inlet valve is made up of a support wall (23) and an inlet flap (7), said inlet flap has a flexible and deformable peripheral region (70) that is not perforated and is located opposite the support wall (23), - the support wall (23) is perforated by at least one orifice (24) situated opposite the peripheral region (70), the inlet flap (7) is connected to the support wall (23) by a non-deformable fixed connection, - the peripheral region (70) has a substantially conical shape before assembly with a large base and a small base and an inner face on the inner side of the cone, said peripheral region (70) exhibits a deformation after the inner face of the large base has been pressed against the support face (23) in the assembled position.

Description

PUMP EQUIPPED WITH AT LEAST ONE VALVE FIXED VALVE

The present invention relates to a pump equipped with at least one non-return valve of an airless distribution system also called "airless", that is to say without air intake so that the product distributed is never in contact with the air before it is dispensed. This type of airless distribution system is used for the distribution of products that are likely to deteriorate in contact with the air. It may be, for example, pharmaceutical products, cosmetic products such as care creams of fluid consistency, that is to say liquid or pasty. As we want to remove preservatives in creams, it is necessary to protect them from the air. The fluid product is therefore packaged in a retractable container so that the volume of the container corresponds precisely at any moment of use to the residual amount of the product it contains, the product never being in contact with the air at the inside of the container.

Typically, the dispenser comprises a pump equipped with an inlet valve and an outlet valve. It is sealingly connected to the container and it has at the outlet of the pump a discharge channel opening on an orifice, the pump being actuated by a push button.

The airtightness of the distribution system is ensured by the inlet and outlet valves of the pump. These are. usually consist of complex elements incorporating balls or valves, both mobile, guides, spring-type support means, opening and closing abutments, etc. These complex systems ensure the tightness of the valve when it is in the closed position and more particularly when the dispensing system is at rest. The distribution system is at rest when the pressures inside of the container and inside the pump as well as the atmospheric pressure are identical. The inlet and outlet valves of the pump are then closed and airtight.

On the other hand, more and more creams are water-based emulsions and the containers in which the cream is packaged are by definition sealed. The water of these emulsions tends to turn into water vapor as soon as it is enclosed in a closed container and the temperature is above 0 ° C. The passage from the liquid phase to the gaseous phase of the water creates an overpressure in the container. It is essential, when the pump is at rest, that the valves are sealed despite the overpressure of the interior of the container relative to the atmospheric pressure.

Traditional pumps equipped with these valves are therefore generally complex, sometimes fragile, and composed of a large number of parts, which complicates the manufacture and increases the cost, especially since these components are generally miniaturized.

In addition, traditional pumps may present risks of retro-contamination. A traditional pump comprises a piston sliding in a cylinder.

The piston defines with the inner face of the wall of the cylinder a closed space of variable volume constituting the dispensing chamber of the pump. The variation of the volume of said chamber is obtained by means of the reciprocating movement of the piston in the cylinder. During this movement back and forth, the inner face of the cylinder is successively constitutive of the distribution chamber and then in contact with the outside air, hence the risk of retro-contamination through the surfaces sequentially in contact with air and with cream. The object of the invention is to provide a pump equipped with at least one non-return valve which is perfectly airtight and which does not present a risk of retro-contamination.

Another object of the invention is to provide such a pump which is both reliable, simple and inexpensive to manufacture.

For this purpose, the invention provides a pump consisting of a deformable conduit having an inlet port closed by an inlet valve, an outlet port and an outlet valve. According to the invention, the pump is characterized in that

the inlet valve consists of a first bearing wall and an inlet valve,

said inlet valve has a flexible, deformable, non-perforated peripheral zone situated opposite the first support wall,

the first bearing wall is perforated by at least one orifice situated opposite the peripheral zone,

- The inlet valve is connected to the first support wall by a non-deformable fixed connection,

- the peripheral zone has a substantially conical shape before assembly with a large base and a small base and an inner face of the inner side of the cone,

said peripheral zone has a deformation consecutive to the support of the inner face of the large base on the first support wall in the assembled position.

The valve is the only product passage zone between the container and the dispensing chamber or between the dispensing chamber and the outside. The combination of the first perforated support wall with the peripheral zone, otherwise called the flexible wall of the valve, closing the orifice of the first support wall by elastic deformation of said zone allows for a precise, resistant and flexible sealing. Indeed, in the assembled position, the peripheral zone has a flattening-like deformation and induces elongation following the bearing of the inner face of _. the large base on the first support wall. The flexible wall has a flattened area on the side of said large base, constituting the area of contact with the first support wall. Before deformation, the peripheral zone has a substantially truncated cone shape. For example, the small base has a diameter of 3.34 mm, the large base has a diameter of 5.67 mm, the wall forming an angle of 45 ° with the axis of revolution of said truncated cone and having a thickness of 0.50 mm. After deformation, the peripheral zone is compressed in the form of a "crushed" truncated cone, the outer diameter of the ring going from 5.67 mm to about 6.20 mm, an elongation of the material of the order of 9 %. This elongation results from the support of the flexible wall on its large base on the side of its inner face. This elongation induces a considerable bearing force, much greater than a non-elastic deformation, which ensures the seal "at rest" and the overpressure of the space upstream of the valve.

For example, the valve remains closed and sealed when the overpressure in the upstream space is less than 40 millibars, preferably less than 100 to 200 millibars, that of the downstream space which is contiguous thereto. Beyond this minimum overpressure, the flexible wall of the valve is deformed. The valve is then in the open position and releases the passage from the upstream space to the downstream space.

The value of the overpressure in the upstream space to open the valve may be modulated depending on the nature of the polymer, the thickness of the wall of the peripheral zone, and the diameter of the valve. The wall of support may have several orifices. The system is sealed after 60 days in an oven at 55 ° C.

In this document, the terms "upstream" and "downstream" are defined with respect to the direction of distribution of the product. For example, a dispensing system comprising the pump according to the invention and a container delimit three spaces, the container, the dispensing chamber of the pump and the outside. The container is a space located upstream of the pump, the dispensing chamber the pump is a space located upstream from the outside, with respect to the direction of flow of the product. These three spaces are isolated from each other by the impervious barriers that constitute the inlet valve and the outlet valve of the pump.

The valve according to the invention is perfectly closed and sealed when the pressures in the container, in the pump and outside are approximately identical. Moreover, one or other of the valves of the invention remains closed and sealed as long as the overpressure in an upstream space with respect to the downstream space which is contiguous thereto, is less than a threshold previously fixed at choice. of the user industry.

In the present description, "the valve is connected to the rigid wall by a fixed non-deformable connection" means that only a portion of the valve ensuring the connection to the rigid wall is fixed and not deformable. This fixed part, made of flexible polymer, is located in the center of the valve. The flexible peripheral zone extends radially outwardly from this attachment zone.

The fixing zone will consist of a flexible chimney part of the valve fitted on a rigid rod connected to the rigid wall. The assembly of the flexible chimney and the rigid rod is a fixed non-deformable and waterproof assembly. The assembly thus produced can withstand an upstream pressure higher than 6 bars. Thus, in the assembled position, the fixing zone can not perform any movement in translation, rotation or deformation of any type with respect to the rigid wall.

The deformable conduit is compressed and then returns to its initial position under the action of a pushbutton connected to said conduit. The advantage of the deformable conduit is that the internal walls of the conduit constituting the distribution chamber, in contact with the product, are never exposed to the external environment of the pump. Thus, there is no risk of retro-contamination, compared to a traditional pump-equipped with a piston sliding in a cylinder.

The combination of the deformable conduit and the valve according to the invention thus forms a pump which is perfectly airtight, even in the presence of an overpressure of the space which is contiguous thereto, and which presents no risk of retro-contamination. Such a pump, consisting of a bellows and at least one valve described above, is reliable, simple and inexpensive to manufacture.

Advantageously, the inlet valve is a one-piece elastic polymer shape memory. The deformation of the polymer causes a prestressing in the peripheral zone of the valve which keeps it resting on the rigid wall when it is in the closed position.

Advantageously, the outlet orifice of the deformable conduit is closed by the outlet valve constituted by a second support wall and an outlet valve identical to the inlet valve, connected to the second support wall by a non - deformable fixed connection and mounted in abutment on said second support wall in accordance with the pressing of the inlet valve on the first support wall. This standardization allows a reduction in manufacturing costs. Advantageously, the deformable conduit is in the form of a bellows. Such a conduit is simple to make, for example by an injection molding process.

Advantageously, the deformable conduit is shape memory. Thus, the conduit is sufficient on its own to regain the initial position after the deformation phase. The duct does not need other return elements, for example a spring, to perform this function. This reduces the number of parts constituting the pump, so the weight and manufacturing cost of said pump.

The invention also relates to a dispensing system consisting of a hoop, a push button and a pump according to one of the preceding features. According to the invention, the dispensing system is characterized in that:

- The hoop is a single piece, the first bearing wall being part of said hoop,

the deformable duct is a single piece, the second bearing wall being part of said deformable duct,

- The push button is a one-piece piece incorporating a discharge conduit connected to the outlet of the deformable conduit and opening on the discharge port of the dispensing system.

Advantageously, the distribution system with at least one of the preceding characteristics is characterized in that:

the discharge orifice is closed off by a tip valve consisting of a one-piece plug valve housed in the discharge orifice and connected to the wall of the orifice by a non-deformable fixed connection,

- The tip valve has an elastically deformable flexible wall closing the discharge orifice and having an opening in its center, concentric with said discharge orifice,

- The flexible wall is mounted in support on a rigid support main axis XX ', said support being part of the one-piece push button and disposed in the center of the orifice vis-à-vis the opening.

the opening has an approximately circular shape,

the rigid support has an approximately circular shape in a plane (P) perpendicular to the axis XX 'and close to the end of said rigid support,

- The diameter of the opening is smaller than the diameter of the rigid support in the plane (P).

The invention also relates to an assembly consisting of a distribution system with at least one of the preceding characteristics assembled with a retractable container mounted on the hoop, by a sealing means. The volume of this type of container corresponds at any time of its use to the residual volume of the product it contains.

Advantageously, the shrinkable container consists of a deformable flexible envelope.

Advantageously, the flexible envelope is enclosed in a rigid openwork container with an opening opening on the outside. The purpose of the rigid container is to allow the user to grip the assembly and to protect the flexible container from accidental damage. The orifice pierced at the rigid container allows the entry of air between the wall of the rigid container and that of the flexible component during the retraction thereof. The assembly with at least one of the preceding characteristics forms a flow path of the conditioned liquid in the container consisting of:

- the retractable container connected to the hoop;

- The hoop connected to the deformable conduit and the inlet valve;

- Deformable duct connected to the outlet valve and the push button; and

- the push button connected to the tip valve.

Said assembly is characterized in that each piece is monobloc and each of these links is a fixed link.

In the present description, we mean by "fixed link" a link n 'authorizing any degree of freedom between the elements linked to each other by this link. The above assembly consists of one-piece parts assembled to each other by fixed links along the flow path of the product packaged in the container. Thanks to the removal of the sliding elements between all the above constituents, these parts and this assembly constitute a barrier to the retro-contamination that is not offered by a traditional pump made partly of sliding elements with each other along said flow path.

Other advantages may still appear to those skilled in the art on reading the examples below, illustrated by the appended figures given by way of example:

- Figure 1 is a section of an airless distribution system whose pump is equipped with a deformable duct type bellows, an inlet valve and an outlet valve according to the invention,

FIG. 2 is a section of the valve in a first arrangement, FIG. 3 is a section of the valve in a second arrangement,

FIG. 4 is a sectional view of the valve before assembly,

FIG. 5 is a sectional view of the valve of FIG. 4 compressed after assembly;

FIG. 6 is a sectional view of a front end fitting valve,

- Figure 7 is a sectional view of the tip valve of Figure 6 after assembly,

- Figure 8 is a sectional view of an assembly comprising a dispensing system according to Figure 1 mounted on a flexible envelope enclosed in a rigid container.

- Figure 9 is a sectional view of an assembly comprising a dispensing system according to Figure 1 mounted on a flexible tube.

- Figure 10 is a sectional view of an assembly comprising a dispensing system according to Figure 1 mounted on a rigid container equipped with a piston.

In the remainder of the description, we will call "up" the side where the push button is located and "down" the side of the container.

The pump 1 according to the invention fits into an airless distribution system 10 comprising a push button 3 and a hoop 2. The push button 3 is mounted to move in translation relative to the hoop 2 in a vertical direction Fl.

In the example illustrated, the pump 1 consists of a deformable duct 6 of the bellows type having an inlet orifice 61 at the bottom and an outlet orifice 62 at the top. The inlet and outlet orifices 61 and 62 are closed respectively by an inlet valve and an outlet valve. In this example, the deformable duct 6 is monoblock to shape memory and the valves have an identical valve.

The inlet valve provides the barrier between a container and the distribution chamber 60, the outlet valve ensures the barrier between the distribution chamber 60 and the outside, the two valves thus defining three sealed spaces with respect to the other of the container, the distribution chamber 60 and the external atmosphere.

With reference to FIGS. 1 to 5, the inlet valve consists of an inlet valve 7 resting on a first bearing wall 23 connected to the hoop 2 while the outlet valve consists of a valve 8 in support of a second support wall 63 connected to the deformable conduit 6 of the pump 1. In the example shown, the first support wall 23 forms with the hoop 2 a single piece. In the same way, the second support wall 63 forms a one-piece assembly with the deformable duct 6. Thus, the number of parts necessary for the production of the pump 1 is reduced.

The inlet valve 7 comprises a flexible peripheral zone 70 and a central fixing means consisting of a chimney 71. Before assembly, the flexible peripheral zone 70 describes a cone of revolution of axis XX, whose generator is approximately a straight line. making an angle A with the axis XX of the chimney 71, for example 45 ° (Figure 4). The value of the angle A may vary depending on the polymer and the inlet valve diameter 7. The preferable angle A combines the largest bearing surface and the greatest support force after assembly.

The assembly consists in resting the inlet valve 7 on the first wall 23, by fitting the chimney 71 on a rod 22 belonging to the band 2 and substantially perpendicular to the first wall 23.

The cone of revolution has a large base 72 and a small base 73, and an inner face 720 on the side inside the cone. Once the inlet valve 7 assembled in the support position, or after crushing, the inlet valve 7 describes a form of revolution whose generator is approximately a quarter circle, the outer end of the peripheral zone 70 describing a flattened ring (see Figure 5) and bearing on the first support wall 23, the large base 72 being deformed by the bearing of its inner face 720 on the first support wall 23. The outer diameter of the large base goes from 5.67 mm to about 6.20 mm, an elongation of the material of the order of 9%. This elongation induces a considerable support force, much greater than a non-elastic deformation, which ensures the seal "at rest".

The first support wall 23 is perforated with at least one orifice 24 disposed under the inlet valve. 7 and to get the product out of the container. The peripheral zone 70 seals up to an overpressure of the upstream zone between 120 and 160 millibars beyond which the peripheral zone 70 will deform to open the valve and allow the product to pass. This value is both sufficient to ensure the tightness of the valve and low enough to give a pleasant feeling to the user.

The outlet valve 8 of the pump has the same characteristics before and after assembly as the inlet valve 7. It has a flexible peripheral zone 80 and a fixing zone consisting of a chimney 81. The cone of revolution presents a large base 82 and a small base 83, and an inner face 820 on the inner side of the cone. In a preferred solution, it is strictly identical to the inlet valve 7. After assembly, the flexible wall 80 is placed in abutment on the second support wall 63 belonging to the deformable conduit 6, with characteristics identical to the bearing of the flexible wall 70 on the support wall 23 belonging to the collar 2. The chimney 81 is fitted on a hollow rod 32, belonging to the push button 3, substantially perpendicular to the second support wall 63. The latter is perforated with at least one orifice 64 disposed under the valve of exit 8.

The outlet valve therefore has identical properties to the inlet valve.

The inlet or outlet valves 7 or 8 can be elastomeric type SEBS, TPP or TEV. The support wall 63, 35 may be of high density polyethylene (HDPE), polycarbonate (PC), polypropylene (PP) or styrene acrylonitrile (SAN) and any type of rigid polymer compatible with the packaged product.

As illustrated in Figure 1, the deformable conduit 6 bellows type comprises a side wall 69 made accordion. The side wall 69 defines a distribution chamber 60 whose volume is variable.

The low end 65 and high 66 of the side wall are respectively connected to a lower fixing ring 67 and top 68. The lower fixing ring 67 is fixedly and sealingly fitted on a cylindrical skirt 21 belonging to the band 2 In the same way, the upper fixing ring 68 is fixedly and sealingly fitted on a cylindrical skirt 31 of the push button 3.

The lower fixing rings 67 and 68, the side wall 69 form a piece, monobloc designated deformable conduit 6.

The push button 3 is pierced with a discharge conduit 35 which allows the dispensing of the product. The exhaust duct 35 is disposed downstream of the pump 1.

We will now describe the operating mode of the pump 1. At rest, the two valves are closed, the two valves are supported on the walls 23 and 63, the deformable duct 6 of the pump 1 and the push button 3 are fixedly connected.

The push button 3 is mobile. The movement of the push-button 3 back and forth causes a variation in the volume of the distribution chamber 60. Indeed, when the user presses the push-button 3, he compresses the deformable duct 6 and the distribution chamber 60 decreases. in volume, which creates an overpressure in said distribution chamber 60. The overpressure causes the opening of the outlet valve 8 of the outlet valve, the volume reduction of the distribution chamber 60 and the evacuation of the product to the outside via the exhaust duct 35. When the user releases the push button 3, the deformable duct 6 returns to its initial position under the resilient shape memory effect of the deformable duct 6, which creates a depression in the distribution chamber 60. The depression causes the closing of the outlet valve 8 of the outlet valve, the opening of the inlet valve 7 of the inlet valve and the filling of the distribution chamber 60 dep. the container (not shown in Figure 1).

^'In addition, the resilient return effect of the deformable conduit may optionally be reinforced by means of a spring disposed outside of the flow path.

By "high position" we mean the high position of the push button 3 in which the distribution chamber 60 is of maximum volume.

As illustrated in Figures 1, 6 and 7, the exhaust duct 35 is followed by a discharge opening 36 opening outwards. A rod 33 of main axis XX 'is placed in the center of the discharge orifice 36. In the example illustrated, the rod 33 forms a one-piece piece with the push button 3 and constitutes a rigid support. Given the geometry of revolution of rod 33 in this for example, the main axis XX 'is the axis of revolution of the rod.

The discharge port 36 is closed by a tip valve. This consists of a one-piece plug valve 9 comprising a hollow cylinder 91, a flexible wall 92 extending radially inwardly from one end of said cylinder 91. The flexible wall 92 is elastically deformable and comprises an opening 93 in the center. The opening 93 of the flexible wall 92 has an approximately circular shape.

The tip valve 9 is mounted in the discharge port 36 by embedding. In this configuration, the cylinder 91 of the valve has an outer face 911 bearing on an inner face 361 of the side wall 362 of the discharge orifice 36. In other words, the tip valve 9 is connected at the discharge orifice 36 by a fixed non-deformable connection.

Referring to Figures 6 and 7, the flexible wall 92 has an inwardly directed inclination of the tip valve 9 before mounting. After mounting, the flexible wall 92 has an angle of between 90 ° and 135 ° approximately with the axis xx 'according to Figure 7. When the angle of the flexible wall with the axis xx' is greater than 90 °, the additional deformation in the open position induces an increase in the diameter of the orifice and therefore an elongation of the flexible wall 92. Said elongation reinforcing the return to the support position after the evacuation of the product and therefore 1 sealing. Precisely, after mounting, the deformation of the flexible wall 92 has the effect of supporting said flexible wall 92 on the free end 331 of the rod 33, which makes it possible to ensure the sealing of the discharge orifice 36 when the metered product has been evacuated. The pressures upstream and downstream of the valve are then identical. The opening 93 has a diameter di in a plane (P) perpendicular to the axis XX 'and close to the free end 331 of the rod 33. Similarly, the rod 33 has an approximately circular shape with a diameter d ₂ in the plane P. The diameter di of the opening 93 is smaller than the diameter d ₂ of the rigid support 33 in the plane P.

The operating principle of the tip valve in the dispensing system 10 is explained below. At rest, that is to say when no action takes place on the tip valve 9, the flexible wall 92 bears against the free end 331 of the rod 33, the pressure being substantially identical to the two sides of said wall 92, and the tip valve forming a sealed barrier in the closed position. When the user presses the push button 3, the pressure of the product contained in the pump 1 and the exhaust duct 35 increases until the flexible wall 92 is raised.

FIG. 8 represents a first assembly 100 comprising the distribution system 10 mounted on a rigid container 4. In the example illustrated, the rigid container 4 envelopes a flexible container, here a retractable pocket 5 made up of a deformable flexible envelope 53.

The hoop 2 is fixedly connected and sealed to the retractable bag 5 by means of a seal 52. An orifice 43 is made in the rigid container 4, preferably at the bottom of the latter, to allow the bag to retract during use. The pocket 4 retracts as the product is dispensed.

As illustrated in FIG. 9, the dispensing system 10 is mounted on a flexible skirt 503 attached to the band 2 by a fastening means 502 to form a second assembly 200. The connection means 502 between the band 2 and the soft skirt 503 also ensures the sealing of said link. The connecting means 502 and the flexible skirt 503 are assembled by welding or overmolding. The flexible skirt 503 is closed at a low end 505 by welding.

In FIG. 10, a third assembly 300 comprises a distribution system 10 mounted on a container 401 comprising a cylindrical rigid wall 406 and a piston 402 sliding in the cylindrical wall 406. The container 401 is connected to the band 2 by a fixed link and waterproof. It further comprises an orifice 403, made at its bottom wall 404, opening outwards and allowing the piston to move upwards during the filling phase of the distribution chamber 60.

Claims

1. Pump (1) consisting of a deformable conduit (6) having an inlet port (61) closed by an inlet valve, an outlet port (62) and an outlet valve , said pump (1) being characterized in that

the inlet valve consists of a first bearing wall (23) and an inlet valve (7),

said inlet valve has a flexible and deformable peripheral zone (70) which is not perforated and is opposite the first support wall (23),

the first bearing wall (23) is perforated by at least one orifice (24) facing the peripheral zone (70),

_. - the inlet valve (7) is connected to the first support wall (23) by a fixed non-deformable connection,

the peripheral zone (70) has a substantially conical shape before assembly, with a large base (72) and a small base (73) and an inner face (720) on the inner side of the cone,

said peripheral zone (70) has a deformation consecutive to the support of the inner face (720) of the large base on the first support wall (23) in the assembled position.

2. Pump according to claim 1 characterized in that the inlet valve (7) is a one-piece elastic polymer shape memory.

3. Pump (1) according to claim 1 or claim 2 characterized in that the outlet orifice (62) is closed by the outlet valve consisting of a second bearing wall (63) and an outlet valve (8) identical to the inlet valve (7), connected to the second support wall (63) by a non-deformable fixed connection and mounted in abutment on said second support wall (63 ·) according to the support of the inlet valve (7) on the first support wall (23).

4. Pump (1) according to one of claims 1 to 3 characterized in that the deformable conduit (6) is bellows-shaped.

5. Pump (1) according to one of claims 1 to 4 characterized in that the deformable conduit (6) is shape memory.

6. Dispensing system (10) consisting of a hoop (2), a push button (3) and a pump (1) according to one of claims 1 to 5 characterized in that:

- The hoop (2) is a single piece, the first bearing wall (23) being part of said hoop (2),

- The deformable duct (6) is a single piece, the second support wall (63) being part of said deformable duct (6), the push button is a single piece incorporating an exhaust duct (35) connected to the outlet port (62) of the deformable conduit (6) and opening on the outlet (36) of the dispensing system (10).

7. Dispensing system (10) according to claim 6 characterized in that: the discharge orifice (36) is closed off by a tip valve constituted by a one-piece plug valve (9) housed in the discharge orifice (36) and connected to the wall (362) of the orifice (36) by a non-deformable fixed connection,

- The tip valve (9) has a resiliently deformable flexible wall (92) closing the discharge orifice (36) and having an opening (93) at its center, concentric with said discharge orifice (36). )

the flexible wall (92) is mounted in abutment on a rigid support (33) of main axis XX ', said support being part of the one-piece push button (3) and disposed in the center of the orifice (36) facing to the opening (93).

8. An assembly characterized in that it consists of a distribution system (10) according to one of claims 6 or 7 assembled with a retractable container (5; 503; 401) mounted on the hoop (2) by a waterproof fastening means.

9. An assembly according to claim 8 characterized in that the retractable container (5; 501) consists of a deformable flexible envelope (53; 503).

10. An assembly according to claim 9 characterized in that the flexible envelope (53) is enclosed in a rigid container (4) pierced by a hole (43) opening to the outside.

11. Assembly according to one of claims 8 or 9 forming a flow path of the liquid packaged in the container consisting of: the retractable container (5; 503; 401) connected to the hoop (2);

- The hoop (2) connected to the deformable duct (6) and the inlet valve (7);

- Deformable duct (6) connected to the outlet valve (8) and the push button (3); and

- the push button connected to the tip valve (9); the assembly being characterized in that each oblong piece and each of these links is a fixed link.