MX2012005696A

MX2012005696A - Measuring cap for a container that can house a pressurized fluid, and container provided with one such cap.

Info

Publication number: MX2012005696A
Application number: MX2012005696A
Authority: MX
Inventors: Serge Gandy
Original assignee: Serge Gandy
Priority date: 2009-11-17
Filing date: 2010-10-27
Publication date: 2012-09-07
Also published as: CN102612472B; CA2780782A1; FR2952618B1; CN102612472A; WO2011061651A1; FR2952618A1; US20120228337A1; EP2501629A1; KR101838644B1; KR20120116413A; RU2012124987A; JP2013510780A

Abstract

The invention relates to a measuring cap (1) for a pressurised container (2), comprising: a body (8) having an axial fluid channel (12), shaped in order to be inserted into the container (2) through the neck (5); a sealing joint (15) shaped bear on a portion of the body (8); an assembly ring (16) which is used for removably securing the measuring cap (1) to the container (2) and which is removable; and a closure member (17) for selectively closing and opening the fluid outlet channel (12).

Description

CONTAINER CONTAINER FOR ADJUSTABLE CONTAINER TO CONTAIN A FLUID UNDER PRESSURE, AND CONTAINER PROVIDED OF SUCH CAP Field of the Invention The present invention relates to pressure vessels capable of containing a liquid, and more particularly the means for closing such pressure vessels.

Background of the Invention The known pressure vessels are of the aerosol type.

An aerosol is a collection of particles, solid or liquid, of a chemical suspended in a gaseous medium.

In everyday life, the term "aerosol" includes the container that contains a mixture of a product and a propellant. The propellant gas creates one. pressure inside the container. When opening an outlet valve, the mixture is expelled to the outside of the pressure vessel. The product is sprayed as an aerosol, that is fine particles suspended in the air.

The propellant gas is generally nitrogen, because it is an inert gas and therefore, less dangerous than propane, butane or other flammable hydrocarbons, which however do not affect the ozone layer.

A known aerosol container comprises a bottom, a side wall and a neck, and is generally made of aluminum. It is expected that the thickness of the container will resist up to 18 bar of pressure inside. There are containers for aerosols with different capacities.

These containers are described in particular in US 3,977,576, GB 2909981 A1, US 6,253,970 B1 and US 3,187,962.

These known containers are sealed with a non-removable distributor valve. The containers can not be reused. When pressure is applied to a drive element connected to the distribution valve, the seal breaks, allowing the product contained in the container to pass to the valve and escape to the outside of the container.

Aerosols, that is, pressure vessels equipped with a non-removable distribution valve, are governed by strict safety standards and draconians. In all known aerosols, the distribution valves are not removable and the product stream leaving the pressure vessel can not be effectively determined. The internal pressure allowed by the standards is limited to 12 bar at 50 ° C. In addition, the known aerosol filler is limited by strict standards to 66% of the volume which in itself is maximum one liter.

The known aerosols only work when they contain a non-granular liquid, otherwise the valve becomes clogged and the aerosols can no longer distribute the fluid.

Brief Description of the Invention A first problem addressed by the present invention is to provide a pressure container closure means suitable for containing a liquid, which is removable, which allows dispensing the output product, and whose safety is guaranteed to use pressures greater than 20 bar.

A second problem that is the basis of the present invention is to design a pressure vessel that allows an intermittent power and that can contain and distribute even granulated fluid.

Taking into account the fact that aerosols do not work with a granular fluid, aerosol valves do not solve these problems.

The basic idea of the invention is to design a reliable removable metering plug, and to use it in combination with a container containing a fluid at a pressure well above the pressures generally allowed for aerosols, for example in the order of 30 bar.

To achieve these objectives and others, the invention proposes, according to a first aspect, a dosing cap for the pressure vessel suitable for containing a liquid, the container comprises a bottom, a substantially cylindrical side wall that tapers to a neck that It has a front face of the neck and an inner edge of the neck, comprising: - A body with a longitudinal axis that has: - A penetrating part, which is shaped to enter the neck of the container, and which has a peripheral radial projection adapted to be coupled against the inner edge of the neck, - An emergent part, with an axial fluid channel communicating with the interior of the container and communicating with the outside of the container through a fluid outlet channel, - A sealing shoulder at the junction between the penetrating part and the emerging part, - A sealing gasket, shaped to cover the sealing shoulder on the front face of the neck, - A mounting ring, capable of being detachably fixed on the emerging part of the body by axially pressing the first seal against the front face and the neck against the sealing shoulder, and - A sealing member adapted to selectively close and open the liquid outlet channel, controlled by a control member accessible in the emerging part of the body.

Such dosing cap is removable. Thus, the container is closed and can be easily reused until a small amount of waste remains. Such dosing cap is green. Such dosing cap does not include the valve. And the pressure vessel equipped with a removable dosing cap is not limited by the strict rules of aerosols, or by other standards if the volume of the container is less than one liter and if the pressure produced by volume is less than 50 bar.

This dosing cap has a simple design, which only has three main elements that can be prefabricated and then a fourth element for mounting the dosing cap to the pressure vessel, it is also easy to use.

Such dosing cap is compatible with the body of conventional aerosol containers, so it is possible to enjoy the low cost of these mass-produced containers. In addition, the cap of the invention is a dosing cap, whereby the user can choose the speed of product flow out of the pressure vessel.

Advantageously, the supply may be the radial peripheral projection comprises a frustoconical portion the cone angle substantially corresponding to the inclination of the inner edge of the neck of the container.

In this way the mechanical components of the power on the neck of the container are better distributed.

Advantageously, it can be provided that the penetrating part comprises at least one rear side face defining a width smaller than the diameter of the neck of the container.

This facilitates the introduction of the body into the pressure vessel. It is advantageous if the at least one side face is positioned so as to allow a slight local deformation of the neck which generates an escape beyond the predetermined pressure inside the container.

This is a cheap security feature that is easy to implement. It is advantageous that the dosing cap is made of metal or plastic.

The use of plastic reduces the manufacturing costs of the dosing cap since plastic is cheaper than metal. However, the metal will have better mechanical strength.

In the case of a metal metering plug, it is advantageous that the metal is made of stainless steel or an aluminum alloy.

These metals are frequent and their mechanized processing or by other means is well known.

Advantageously, it is expected that the mounting ring is attached to the body by screwing, pressing or fixing.

These types of assembly allow obtaining a dosing cap that is removable.

Advantageously, it can be provided that the penetrating part of the body comprises two side plates on both sides of the longitudinal axis of the body. One of these two plates forms the side face.

It is advantageous that the mounting ring includes a peripheral skirt that surrounds the neck of the container leaving a space between the rear end edge and the peripheral wall of the container.

This is an economical and easy-to-apply safety feature that guides the user away from the jet of fluid exiting the container through the joint in the event of overpressure.

By surrounding the neck of the container, the ring assembly also serves as a neck reinforcement, opposing the action of the internal pressure of the container tending to expand the neck.

Advantageously, it can be provided, according to a first embodiment, that the sealing element is a rod slidably mounted in the axial fluid channel between a closed position and an open position, and comprises two annular grooves adapted to receive the annular joints of sealing.

The stroke of the sealing element is limited between two preset positions. This avoids any risk of the sealing element unexpectedly leaving the axial fluid channel.

In a second embodiment, it is advantageous if the sealing element is a captive screw which is operated when it is screwed or unscrewed in the body.

The penetration of the captive screw into the body is precisely selected by a user when screwing or unscrewing the set screw more or less. And this structure is very suitable for applications in which the liquid contains solids in suspension or powder.

It is advantageous that the sealing element further comprises a closing element located in the axial fluid channel near the neck of the container and kept away from the latter by a spring or by the internal pressure of the container.

The closing element has a double function, namely the function of the filling valve and the function of the safety element. In a second aspect, the invention provides a container for containing a fluid under pressure, closed with a dosing cap of the first aspect of the invention, and having an initial internal pressure above 20 bar.

Said container is not required to comply with the standards of aerosols, since it does not include a fixed valve and the cap is removable.

Brief Description of the Figures Other objects, features and advantages of the present invention will become apparent from the following description of specific embodiments, taken in conjunction with the accompanying drawings in which: - Figure 1 is a longitudinal sectional view of a pressure vessel equipped with a metering plug according to a first embodiment of the invention; Figure 2 is a dismembered view of the components to be assembled to form the dosing cap of Figure 1; - Figure 3 is a side view of the body of the dosing cap of figure 1 in a state introduced into the neck of the container; Figure 4 is an enlarged longitudinal sectional view of the dosing cap of Figure 1; - Figure 5 is a longitudinal sectional view of the dosing cap of figure 1 in a closed position; Figure 6 is a longitudinal sectional view of an enlargement in the level of the annular groove of the dosing cap of Figure 1 in an intermediate position; - Figure 7 is a longitudinal sectional view of the cap of Figure 1 in an open position; - Figures 8 and 9 are longitudinal sectional views of a pressure vessel equipped with a metering plug according to a second embodiment; - Figures 10 and 11 are longitudinal sectional views of a pressure vessel equipped with a metering plug according to a third embodiment.

Detailed description of the invention Figures 1-7 illustrate a first embodiment of the invention, in which a metering plug 1 is screwed to a pressure vessel 2. The numbers refer to similar elements in all these figures.

Figure 1 shows the closed container 2 by a dosing cap.

The container 2 comprises a lower part 3, a cylindrical side wall 4 which tapers to a neck 5. The constriction is provided at an inclination angle β. The neck 5 is produced by a fold on itself towards the outside of the material of the container 2. The collar 5 includes an end face of the collar 6 and a lower edge of the collar 7. The container 2 is provided to contain a fluid under pressure.

To describe a dosing cap, figure 4 is considered, which more accurately illustrates in section the constituent elements of a dosing cap.

The dosing cap 1 comprises a body 8 with a longitudinal axis 1-l, a sealing gasket 15, a mounting ring 16, a sealing element 17, and an actuator 18.

The body 8 comprises a penetrating part 9 and a protruding part 11 which meet in a sealing shoulder 14 facing the emerging part 11.

The penetrating part 9 comprises a substantially cylindrical distal part and a proximal radial projection device 10. The protrusion 10 comprises a frustoconical peripheral radial part 10a (FIG. 2) of a cone angle a.

The angle of the cone is provided to correspond to the angle of inclination ß as well as to distribute the mechanical stresses of the dosing cap 1 of the container 2.

The penetrating part 9 comprises two side plates 19a and 19b (figures 2 and 3) on both sides of the longitudinal axis 11 of the body 8. These two side plates 19a and 19b (figures 2 and 3), parallel to the longitudinal axis II, are provided to allow the introduction of the penetrating part 9 of the body 8 into the container 2 by the neck 5.

For this, the width 190 of the penetrating part 9, in the two side plates 19a and 19b, is expected to be smaller than the diameter D of the neck 5 of the container 2.

Alternatively, the penetrating part 9 of the body 8 may include non-symmetrical, non-parallel sides or even a single side. The key is to allow penetration of the penetrating part 9 into the neck 5 and a sufficient interval for the seal 15.

The emergent part 1 comprises an axial channel 12 passing through the fluid, a fluid outlet channel 13, and a threaded portion 11a on its outer surface near the sealing shoulder 14. The fluid outlet channel 13 and the channel axial fluid 12 communicate with each other to allow, that when the dosing cap is mounted on the container 2, the product flows into the container 2.

The axial fluid channel 12 includes an intermediate shoulder 30, disposed at an intermediate position between the liquid outlet channel 13 and the hole 12a before the axial fluid channel 12 and having its side facing upwards.

The seal 15 is annular and is shaped to cover the sealing shoulder 14 and the end face of the collar 6.

The mounting ring 16 comprises a substantially cylindrical part 25 having a thread through the opening 24, and a peripheral skirt 20. The thread of the threaded opening 24 of the mounting ring 16 is designed to match the thread of a threaded portion of the emerging part 11.

The sealing member 17 is adapted to selectively close and open the fluid outlet channel 13. It is controlled by a switching device 18 accessible in the emerging part 11 of the body 8.

The sealing member 17 is a rod having two annular grooves 22a and 22b with a frusto-conical profile and displaced longitudinally to one another over a distance greater than the axial distance between the fluid outlet channel 13 and the intermediate shoulder 30 (FIG. 4).

Each annular groove 22a and 22b is provided with a seal, respectively 23a and 23b. Each sealing gasket 23a and 23b can advantageously be made of an elastomer and have a cylindrical tubular shape with a circular section of uniform thickness. The annular groove 22a before has a depth that is reduced in the direction of the hole 12a above.

The sealing member 17 includes an intermediate part 170 between the two 22a and two annular grooves 22b and which is cylindrical in the embodiment of Figures 1-7. The intermediate part 170 can have a truncated cone shape, however, or, more broadly, any shape that is determined depending on the size of the fluid to be distributed.

Figures 5 to 7 illustrate the sliding of the sealing member 17 in the axial fluid channel 12.

Figure 5 illustrates a metering cap in the sealing position P1 in which the product in the container 2 can not be pushed out of the container 2: the sealing gasket 23a above is coupled in a small diameter cylindrical section of the fluid channel axial 12, between the liquid outlet channel 13 and the intermediate shoulder 30 and, thus providing continuation provides tightness to the axial fluid channel 12.

Figure 6 illustrates on a larger scale the sealing element 17 in an intermediate position P. In this intermediate position P, the sealing gasket 23a above is to the right of the intermediate shoulder 30, and performs a partial opening allowing the pressurized fluid to pass through. at a speed that the user can control by the axial displacement of the sealing member 17. The conical shape of the annular groove 22a progressively pushes the sealing gasket 23a above, allowing a progressive opening.

Figure 7 illustrates a metering cap in an open position P2, in which the product in the container 2 is pushed out of the container 2.

As illustrated in FIG. 5, when the sealing member 17 is in the sealing position P1, the liquid can not be ejected since the axial fluid channel 12 is closed by the sealing member 17. Due to the pressure inside the container 2, the sealing element 17 is pushed outwards, and its movement is limited by a shoulder 26 provided in the sealing member 17 and which comes to rest axially against the intermediate shoulder 30 of the axial fluid channel 12, preventing the shutter element 17 will escape.

The seal is provided in the sealing position P1 by the sealing gasket 23a which is pressed against the wall of the axial fluid channel 12.

In the case of overpressure inside the container 2 beyond a certain pressure value, an escape is possible thanks to the seal 15 and in the space E between the peripheral skirt 20 and the container 2.

When a user applies a force F (figure 7) on the actuator 18, the rod of the sealing member 17 is pushed towards the axial fluid channel 12. The liquid does not escape through the previous seal 23a is always pressed against the wall of the axial fluid channel 12. As will be understood from Figure 6, the sealing is secured very efficiently and economically with a cylindrical sealing gasket 23a which engages in an annular groove in the shape of a truncated cone 22a.

Figure 7 illustrates the elements in the open position P2 in which the fluid is expelled. The sealing member 17 is lowered sufficiently to break the seal at the level of the sealing gasket 23a above.

The fluid is expelled in a controlled manner to the outside through the axial fluid channel 12 and then through the outlet channel 13. The second sealing gasket 23b ensures the tightness of the plug to prevent an amount of liquid from being eliminated towards the outlet. actuator 18.

The actuator 18 is a plug provided with a threaded hole 18a for fixing it by screwing the distal threaded end 17a of the sealing element 17. On the other hand, the actuator 18 can be fixed by cutting, pressing, gluing or adhesion.

In the described embodiment, an elastic means 17b of the helical compression spring type is coupled between the actuator 18 and the body 8, to help close if the pressure is too low inside the container 2, or if the fluid is sticky .

The elastic means 17b is not indispensable, and it can be considered that the pressure inside the container 2 is sufficient to allow the sliding of the sealing member 17 to the position P1 of the obturator with the appropriate fluids to distribute.

If necessary, the fluid in the first container should be filtered.

Figure 2 helps explain the assembly order of these elements to obtain a dosing cap.

The seal 15 is placed inside the mounting ring 16, so that once assembled, the seal 15 provides the seal on the neck 5 of the container 2. It is mounted on the free sliding stop member 17 of the actuator 18 in the axial fluid channel 12 in the upward direction by means of the coupling of the hole 12a. The sealing gaskets 23a and 23b have previously been mounted in the annular grooves 22a and 22b, respectively, provided in the sealing member 17. The mounting ring 16 provided with the seal 15 is coupled to the body 8. The sealing member 18 is screwed into the distal end 17a of the sealing element 17, blocking it against rotation in the sealing element by the coupling of a screwdriver in a slot 17c provided at the proximal end of the sealing member 17. As an alternative to the slot 17c, any other locking means can be provided, and the slot 17c can have any another profile.

Next, we can introduce the part of the oblique penetration 9 into the neck 5 of the container 2. This introduction is made possible by the presence of two side plates 19a and 19b. Next, the dosing cap 1 is positioned so that the peripheral radial projection 10 engages against the inner edge of the neck 7.

Subsequently, the mounting ring 16 is screwed into the threaded portion of the emerging part 11 of the body 8. The mounting ring 16 axially clamps the first seal 15 against the end face of the neck 6 and against the shoulder 14. The cap assembly Doser 1 with container 2 is made.

The peripheral skirt 20 surrounds the neck 5 of the container 2, leaving an exhaust space E between its end edge 21 and the peripheral wall 4 of the container 2.

The invention also provides safety for the users, by means of a safety escape when a predetermined maximum pressure is reached inside the container 2. To do this, the side plates 19a and 19b are positioned back, so as to allow a slight local deformation of the neck 5 that is carried out in an area of lower resistance. Thus, when the predetermined maximum pressure is reached, the neck 5 deforms to the outside and the seal 15 is less crushed, generating a safety leak.

This first embodiment is particularly suitable for fluids with a particle size of less than 500 μ? T ?.

Figures 8 and 9 illustrate a second embodiment of the present invention, wherein the container 2 (figure 1) is closed with the dosing cap 100. As in the first embodiment, the cap 2 is mounted by screwing the dosing container 100.

The same essential means are identified with the same reference numbers as in Figures 1-7.

The dosing cap 100 includes a body 80 with a longitudinal axis 11-ll, a seal 15, a mounting ring 16, a sealing member 40.

The main difference between the first and second embodiments resides in the fact that in the second embodiment the sealing member 41 and the actuator 42 are made in a single piece and form the sealing element 40. Alternatively, the actuator 42 can be a part placed by cutting, pressing, gluing or adhesion.

The axial fluid channel 12 includes a threaded upper portion 2b, a lower shoulder 43 and an intermediate shoulder 44a. The lower shoulder 43 is disposed at an intermediate position between the liquid outlet channel 13 and the hole 12a before the axial fluid channel 12.

The sealing member 40 is adapted to selectively close and open the fluid outlet channel 13. It is directly controlled by an action of the user on the actuator 42 accessible in the projecting part 11 of the body 80.

The sealing member 41 is a rod having four sections. A first upper section 41a is partially coiled in the proximal portion of the actuator 42. A second section 41b has a reduced diameter, and includes an annular groove 45 for the double frustoconical profile.

The annular groove 45 may have any other way of making a protuberance, such as a spherical profile.

The first section 41 and the second part 41b are joined by a shoulder 44a. The third section 41c is the conical profile and is joined to the fourth section 41 in tip that ends in the stem.

The annular groove 45 is provided with a seal 46. As in the above embodiment, the seal 46 can advantageously be made of an elastomer and have a tubular shape with a uniform circular cylindrical thickness. The annular groove 45 has a depth that increases towards the anterior hole 12a.

In this embodiment, the dosing cap 100 further comprises a closure element such as a sphere 47 engaged in axial movement in the axial fluid channel 12, and maintained in position by a conical spring 48. The diameter of the ball 47 is chosen it is not enough to enter the container 2 and enough to create the seal 47 when the ball is in contact with the lower shoulder 43.

In a modality not shown, the spring can be straight and supported on the dip tube 49 (FIGS. 8 to 11) whose inner diameter is smaller than that of the ball 47.

Now we are going to describe the operation of the dosing cap 100.

In the position illustrated in Figure 9, the dosing cap 100 is in a sealing position in which the product contained in the container 2 can not be expelled to the exterior of the container 2. The fourth section 41d of a point of the sealing member 41 cooperates with a constriction 50 of the anterior axial fluid channel 12 of the fluid outlet channel 13. The constrictions 50 form a seat against which the fourth section 41d can rest, thus ensuring the tightness of the axial fluid channel 12.

When the sealing member 41 is in an intermediate position, the fourth section 41d at a point that no longer cooperates with the constriction 50 of the axial fluid channel 12. Thus, a partial opening is formed which allows the pressurized fluid to pass through. a speed that the user can control by the axial displacement of the valve member 41 by unscrewing more or less the sealing element 40. The pointed shape of the fourth section 41d allows a gradual opening.

In order to adapt the fluid flow rate according to the size of the fluid to be distributed, the diameter of the third section 41c and the shape of the tip 41 can be modified.

In an open position, the product contained in the container 2 is pushed out of the container 2 so that the third section 41c is no longer in contact with the constriction 50 of the axial fluid channel 12, which has the effect of breaking the tightness.

When a user unscrews the sealing element 40, the rod of the sealing member 41 returns to the axial fluid channel 12. The closing joint 46, which is pressed against the wall of the axial fluid channel 12, prevents the advance of the fluid to the actuator 42 The ball 47 performs the double function of filling valve and safety valve. The safety valve function is illustrated in Figure 8.

Indeed, during filling, the sealing element 40 is absent, by opening the outlet fluid channel 13, the ball 47 is pushed by the conical spring 48 towards the lower shoulder 43. By contact between the ball 47 and the lower shoulder 43 , the hermeticity is ensured.

During filling, the incoming fluid under pressure pushes the ball 47 into the interior of the container 2 so that the ball 47 is no longer in contact with the lower shoulder 43, and the pressurized fluid passes inside the container 2.

The ball 47 acts as a check valve, since it prevents the flow of the fluid contained in the container 2, as the fluid moves to the outlet pushes the ball 47 in contact with the lower shoulder 43, creating the tightness and the prevention of ejection of fluid under pressure to the outside of the container 2.

The ball 47 also plays the role of the safety valve, since if the sealing element 40 is accidentally unscrewed, and the ball 47 again makes contact with the lower shoulder 43 to create the seal. The pressurized fluid is then no longer expelled to the outside of the container 2.

Figures 10 and 11 illustrate a third embodiment of the invention. The difference with respect to the second mode is the absence of a conical spring. The ball 47 is held in place by a sufficient pressure inside the container 2 (Figure 10).

In Figures 8 to 11, an immersion tube 49 is illustrated to guide the fluid from the interior of the container 2 to the outside.

The ball 47 has a larger diameter than the inner diameter after the assembly of the immersion tube 49, so that the ball 47 does not enter the container 2 (Figure 11). In this way, the ball 47 is coupled between the immersion tube 49 and the lower man 43.

The dip tube 49 is not shown in Figures 1-7, but can be expected to fulfill the same function that includes limiting the travel of the ball 47 or the support function of the spring 48.

In the embodiments of Figures 8-11, it is advantageous that the tip cone 41d has an angle of about 60 °, and the tip is truncated to avoid damaging the ball 47 when the tip 41 is in contact with the ball 47.

The second and third embodiments are more particularly suitable for fluids with a particle size of less than 2 mm.

The dosing cap can be made of any material that has food characteristics when the container must contain and dispense liquid for feeding. It can be made of plastic or metal (for example stainless steel or an aluminum alloy).

The fluid outlet 13 can have any shape that allows the adaptation of an extension tube for fluid distribution in a more ergonomic manner.

In a modality not shown, the cone angle of the frustoconical portion of the radial peripheral protuberance 10 does not correspond to the inclination ß of the inner edge of the neck of the container. Thus, during the rotation of the penetrating part 9 a bite is created and firmly blocks the body 8.

In another embodiment not shown, based on the embodiments of Figures 8-11, the ball 47 could be replaced by a cylinder of diameter substantially smaller than the diameter of the axial fluid channel 12 and significantly larger than the inner diameter of the spring 48. , if any. Said cylinder may be provided with a substantially frustoconical groove, like the groove 22a (Figure 6). A seal, such as the seal 23a, is provided in the throat. The sealing is effected as shown in Figure 6, the seal comes into contact with a narrowing of the axial fluid channel, such as the constriction 50 (Figures 8 to 11).

The present invention is not limited to the modalities that have been explicitly described, but includes variants and generalizations thereof contained within the scope of the following claims.

Claims

1. A dosing cap (1, 100) for a container (2) suitable for containing pressurized fluids, the container (2) comprises a lower part (3), a substantially cylindrical lateral wall (4) tapering towards a neck (5). ) has a front face of the neck (6) and an inner edge of the neck (7), characterized because it comprises: - a body (8, 80) having a longitudinal axis: - a penetrating part (9), which is shaped to enter the neck (5) of the container (2), and which has a peripheral radial projection (10) adapted to engage against the inner edge of the neck (7) - a protruding part (11), with an axial fluid channel (12) communicating with the interior of the container (2) and communicating with the exterior of the container (2) by a fluid outlet channel (13), - a sealing shoulder (14) at the junction between the penetrating part (9) and the emerging part (11), - a hermetic seal (15), shaped to cover the sealing shoulder (14) and on the front part of the neck (6), - a mounting ring (16), capable of releasably fixing the emerging part (11) of the body (8, 80) axially compressing the first seal (15) against the front face of the neck (6) and against the sealing shoulder (14), and - a sealing member (17, 41) adapted to selectively close and open the fluid outlet channel (12) controlled by an actuator (18, 42) accessible in the emerging part (11) of the body (8, 80).

2. The dosing cap (1) according to claim 1, characterized in that the peripheral radial projection (10) has a frustoconical part (10a) having the cone angle that substantially corresponds to the inclination of the inner edge of the neck (7) of the container ( 2).

3. The dosing cap (1) according to one of claims 1 or 2, characterized in that the penetrating part (9) comprises at least one lateral face (19a; 19b) defining a width (190) smaller than the diameter (D) of the neck (5) of the container (2).

4. The dosing cap (1) according to claim 3, characterized in that said at least one side face (19a; 19b) is positioned so as to allow a slight local deformation of the neck (5) that generates an escape upon exceeding a predetermined pressure within the container (2).

5. The dosing cap (1) according to any of claims 1 to 4, characterized in that it is made of metal or plastic.

6. The dosing cap (1) according to claim 5, characterized in that the metal is stainless steel or an aluminum alloy.

7. The dosing cap (1) according to any of claims 1 to 6, characterized in that the mounting ring (16) is fixed to the body (8, 80) by threading, pressing or nailing.

8. The dosing cap (1) according to any of claims 1 to 7, characterized in that the mounting ring (16) has a peripheral skirt (20) that surrounds the neck (5) of the container (2) leaving an escape cavity (E) between the end edge (21) and the side wall (4) of the container (2).

9. The dosing cap (1) according to any of claims 1 to 8, characterized in that the sealing member (17) is a rod slidably mounted in the axial fluid channel (12) between a closed position (P1) and a position open (P2), and has two annular grooves (22a and 22b) that receive the annular sealing gaskets (23a and 23b).

10. The dosing cap (1) according to any of claims 1 to 8, characterized in that the sealing member (41) is a fixing screw that is operated when screwing or unscrewing in the body (80).

11. The dosing cap (1) according to claim 10, characterized in that the sealing member (41) further comprises a closing element (47) positioned in the axial fluid channel (12) near the neck of the container (2) and is maintained removed from the latter by a spring (48) or by the internal pressure of the container (2).

12. A container (2) suitable for containing a fluid under pressure, characterized in that it is closed by a plug (1) according to any of claims 1 to 11, and because its initial internal pressure is more than 20 bar.