CN103492286A - Dispensing aerosol valve for pressurized container, dispensing adapter therefor, and assembly of a pressurized container with an adapter - Google Patents

Abstract

The present invention concerns a pressurized aerosol container comprising a specific valve and a dispensing adapter to be used therewith for dispensing a pressurized liquid contained in said container, the liquid beng preferably a moisture reactive composition. The valve comprises a valve stem (1) provided with a central bore (1C) having an internal threaded portion (IF), allowing the fixing and connection of a disposable dispensing adapter (5), comprising a connecting end provided with a mating outer threaded portion (5F).

Description

Dispensing aerosol valves for pressurized containers, dispensing adapters for pressurized containers, and pressurized container and adapter assemblies

technical field

The present invention relates to pressurized aerosol containers which include a valve of the type operable to dispense a moisture reactive composition, such as polyurethane foam, in aerosol form. In particular, the invention relates to a combination of an aerosol can with a valve and a dispensing adapter for facilitating the dispensing of the liquid contained in the can, said combination allowing the adapter to be connected very easily to the valve, thus ensuring an airtight connection and not spilling any liquid when fixing the dispenser to the valve.

Background of the invention

Typically, aerosol valves for dispensing moisture-reactive compositions in aerosol form, such as polyurethane foam precursors, are secured to pressurized canisters by means of a cup that surrounds the perimeter of the canister. The top opening is closed by a peripheral annular channel of a bead that defines the perimeter of the can top opening. The cup includes a central hole through which a tubular elastic grommet extends both above and below the cup (the expression "below" and "above" in the cup here means facing inside and outside of the tank). The grommet is substantially a hollow cylindrical tube with a central bore open at both ends and which includes a radially outwardly extending substantially An annular flange, and the upper surface of the hollow cylindrical tube is in contact with the lower (inner) surface of the cup and is adapted to seal against the latter.

A rigid stem is fitted snugly into the central bore of the grommet, extending below and above said grommet, and through suitable means (typically an annular flange sandwiched between the upper and lower portions of the grommet). ) while being held in place. The valve stem is formed from a hollow tube closed at a first end by an annular base forming a flange having a diameter greater than the diameter of the inner bore of the grommet, and the The upper surface of the base flange is adapted to seal against the lower surface of the grommet flange. The sidewall of the tubular portion of the rod typically includes openings that place the inner bore of the rod in fluid communication with the interface between the rod base and the grommet flange.

By tilting and/or pressing down on the portion of the stem extending from the grommet, the sealing interface between the grommet flange and the valve base is broken, allowing the inner bore of the stem to become fluid with the composition contained in the tank Unicom. Since the tank is pressurized, the contents of the tank are dispensed through the valve. When the valve is closed, the valve must ensure that no moisture from the outside world contacts the contents of the tank, especially if the composition is reactive to moisture. Examples of valve designs suitable for dispensing a moisture reactive pressurized composition such as a polyurethane foam can be found in WO2006/032061, US6.425.503, US4.765.516, EP0.102.797, WO2009/042206, WO96/17795 turn up.

Tank and valve systems of this type are widely used, for example, in polyurethane foam compositions. They are usually sold in relatively small quantities (typically 1 liter cans or less) and are disposable. For storage reasons, and to keep the packaging of such pressurized canisters as compact as possible, the valve stem is usually straight and relatively short in length. This renders such canisters rather impractical to use, as actuation is difficult on short valve stems and the accuracy of dispensing in complex positions is rather insufficient. For this reason, these tanks are often equipped with a separate dispensing adapter comprising (on the one hand) an actuation device to facilitate the actuation of the valve and (on the other hand) a longer, sometimes orientable dispensing line , allowing for a more precise and regionalized distribution of liquids. Different types of such dispensing adapters are available; in particular, disposable dispensing adapters are sold with canisters and are especially suitable for DIY users, which should be compared with reusable dispensing adapters usually used by professional workers. Dispensing guns are distinguished from reusable dispensing guns, which are sometimes equipped with their own pressure supply. <0}

Inexpensive disposable dispensing adapters for DIY applications are usually fastened directly to the valve stem. Snap-fit systems, engaging pin systems, and similar systems are often used, but these connection systems have the disadvantage that they require pressure to be applied to the valve stem to secure the dispense adapter, which often results in some pressurized tank failure when the adapter is secured. Unwanted spillage of contents. This problem can be solved by providing a valve stem with an externally threaded portion and securing a dispense adapter with a mating internally threaded portion to the valve, as disclosed for example in Figure 5 of WO9617795.

On the other hand, in order to ensure greater stability of the dispensing gun, it is often screwed to the tank itself, on an insert or directly on a cup (not on the valve stem) The threaded portion is held in place and the dispensing line of the dispensing gun is in fluid communication with the valve stem through a connecting end. Sealing means are provided on the valve itself (eg a grommet) or on the sleeve forming the end of the gun connection (eg an O-ring or a gasket). An example of such a geometry is shown in Figure 4 of WO9617795, where the sealing means is formed by a valve grommet comprising a plurality of rubber flanges.

This means that a valve stem with an externally threaded portion suitable for securing a disposable dispensing adapter cannot be used to secure a dispensing gun to be screwed directly onto a canister, because at a connecting end of the dispensing gun there is an A tight seal cannot be formed between the stems of the threaded sections. This seemingly trivial problem is a major problem for valve manufacturers who must run multiple separate production lines, storage and distribution facilities depending on the type of application: namely, canisters to be used with single-use dispense adapters, where the valve stem includes an externally threaded portion; and those canisters to be used with dispensing guns for more specialized applications that require a smooth valve stem to ensure air tightness.

The present application proposes a solution to this problem, allowing the same valve stem to be optimally adapted to both types of dispensing canisters: namely, canisters with disposable dispensing adapters used by DIY users, and canisters used by dispensing guns. cans used by professionals. This and other advantages are explained in the next sections.

Summary of the invention

The invention is defined in the appended independent claims. Preferred embodiments are defined in the dependent claims. In particular, the present invention relates to a solution for easily connecting a dispensing adapter to the valve of a pressurized container without inadvertently spilling any of the contents of the pressurized container and ensuring that both close connection between them. In particular, the present invention relates to a valve stem for use in an aerosol-type dispensing valve, said valve stem comprising:

(a) a hollow tubular portion (1A) defining a central bore (1C) extending along a central axis from a first open end open to the surrounding atmosphere to a second opposite end, the second opposite end is closed by the next term,

(b) an annular end base (1B) having a diameter greater than the diameter of the valve stem (1),

(c) at least one opening (1E) located in a wall of the tubular portion (1A) adjacent to the end base (1B) and connecting the central hole (1C) with the surrounding environment, and

(d) Fixing means in the form of a thread (1F) adapted to receive and secure a dispense adapter provided with a mating thread,

It is characterized in that said fixing means is a screw thread (1F) defined by a continuous helical groove on the inner surface of the central hole (1C) of the stem.

In order to allow easy and airtight fixing of an adapter to the rod, the groove defining the thread should have a conical cross-section parallel to the central axis, preferably said cross-section has a substantially trapezoidal or Triangle geometric shape.

In order to optimize cooperation and tightness with a grommet and an outer dispensing adapter when mounted on a pressurized tank, it is preferred that the tubular portion of the stem further comprises an outer frusto-conical flange, the outer truncated The slope of the nose cone faces the first open end.

The invention also relates to a pressurized container comprising a dispensing valve comprising:

(a) A grommet made of resilient material that forms a seal between the container and,

(b) a valve stem as defined above,

Wherein this seal between the grommet and the valve stem can be broken by tilting and/or pressing the valve stem.

Since the valve stem is equipped with an outer frusto-conical flange, it is preferred that the top of the grommet rests on the flat underside of the flange to ensure airtightness. The pressurized container according to the invention is particularly suitable for containing and dispensing under pressure a liquid which is reactive to moisture, such as a polyurethane precursor.

The invention also relates to a dispensing adapter suitable for connection to a dispensing valve of a pressurized container as discussed above, said adapter comprising:

(a) a hollow dispensing tube having a first dispensing end and a second connecting end,

(b) an actuating device fixed at one end to the dispensing pipe and allowing actuation of the valve when in position,

Wherein the second connection end of the distribution tube includes an external thread.

In order to apply a compressive force component to the valve and enjoy a high force couple when actuating the actuating means, it is preferred that the dispense adapter of the present invention further comprises a gripping means fixed at one end to On the dispensing tube substantially opposite to the actuating device, a second end of the gripping device is adapted to grip a flange of a pressurized container, while the second connecting end of the dispensing tube is screwed to the on the dispensing valve of the container. Note that in the absence of the gripping means, the flexural strain is mostly applied to the valve when the actuating means is actuated.

The dispensing tube of the dispensing adapter is generally not straight, and the orientation of the first dispensing tip is preferably variable in order to enhance comfort and precision of use.

The present application also relates to a combination of a pressurized container as discussed above and a dispensing adapter in the form of a kit of parts for dispensing liquid from the pressurized container, the kit comprising:

(a) a pressurized container as discussed above;

(b) a distribution adapter as discussed above;

This enables the internal thread of the valve stem to match the external thread of the second connection end of the adapter.

Where the stem valve is equipped with an outer frusto-conical flange, it is preferred that the dispense adapter includes a mating surface that allows the dispensing tube of the adapter to be screwed into the stem valve when the second connection end of the dispense tube is screwed into the stem valve. Forms a tight seal with the stem valve.

Where the adapter is equipped with gripping means as discussed above, it is advantageous to use said gripping means to form a lever to facilitate the actuation of the valve, said lever consisting of a fixed point formed by the A gripping point is formed between the flange of the canister and the gripping means of the adapter, and the lever extends to the actuating means, the second connection end of the dispensing tube being positioned between these two points.

The invention also relates to a method for dispensing a liquid from a pressurized tank, the method comprising the steps of:

(a) provide a parts kit as previously discussed;

(b) screw the external thread of the dispense adapter onto the internal thread of the valve stem;

(c) pressing the actuating means of the dispense adapter with a finger of the hand to orient the dispensing tip of the dispense adapter toward a target, and

(d) Dispensing liquid onto the target.

Allowing for more accurate dispensing, the present invention allows a dispensing adapter to be secured to a pressurized canister that is airtight, easy to achieve and greatly reduces inadvertent spraying of the canister while securing the adapter the risk of its contents. These and other advantages of the present invention are described in more detail in the sections that follow.

Brief description of the drawings

For a fuller understanding of the nature of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings, in which:

Figure 1 : shows an embodiment of a valve according to the invention.

Figure 2: shows an embodiment of a disposable dispense adapter according to the invention: (a) detached from the valve, and (b) connected to the valve.

Figure 3: shows an embodiment of a disposable dispenser adapter according to the invention comprising gripping means: (a) 3D view, and (b) 2D cutaway.

Figure 4: Side view showing two embodiments of a disposable dispense adapter connected to the valve stem of a canister without gripping means (a) and a canister with gripping means (b).

Figure 5: Shows an example of an internal thread in the center hole of the rod.

Detailed Description of the Invention

The present invention relates to a valve stem for use in a valve of a pressurized container, preferably a tilt valve actuated mainly by tilting or a gun valve actuated mainly by pressing down. Preferably the valve is used to dispense moisture reactive liquid compositions, such as one or two component polyurethane foam compositions. As illustrated in the various embodiments in Figure 1, the valve of the present invention is of the type comprising a valve stem (1), a grommet (2) and a valve cup (3).

Stem (1)

A valve stem (1) comprising a hollow tubular portion (1A) defining a central bore (1C), said valve stem having a first end open to the surrounding environment and closed by a generally annular end base (1B) A second opposite end of . The tubular portion of the stem (1) preferably includes a flange (1D) for holding the grommet (2) in place (defined below) and for forming a ) of the tight seal. The upper side of the flange (ie facing away from the can) preferably has a frusto-conical geometry in order to enhance the seal with the dispense adapter.

The central bore (1C) of the valve stem comprises at least one side opening (1E) on the tubular portion (1A) adjacent to the end base (1B), remote from the first end opening, so that between the two ends of the valve stem A fluid communication is formed.

According to the invention, the central hole (1C) of the valve stem includes fixing means in the form of an internally threaded part for fixing a disposable dispensing adapter directly to the valve without pressing the valve down to snap it into place Fit in place. A screw thread (1F) is defined by a continuous helical groove on the inner surface of the stem's central bore (1C). Fig. 5 shows an example of an internally threaded portion according to the present invention. An internal screw thread is characterized by a ridge (1cr) protruding from the root (1rt) and joined by flanks (1fl). The flanks are not parallel to each other, two flanks (1fl) join at the same root (1rt) forming an angle α which is preferably greater than 20°, more preferably greater than 30°, most preferably greater than 35°. Optimally, the angle α should be comprised between 45° and 60°, typically around 50°±5°. As is well known in the art, the multiple tapered valleys thus formed between the two ridges (1cr) joined at the same root (1rt) by the non-parallel flanks (1fl) permit This reduces friction when screwing onto such an internal thread (1F) and also ensures the gas-tightness of the resulting joint. For example, US20060048843 discloses a valve stem for a pressurized gas container comprising a static mixer in the form of a helical groove on the inner surface of the central bore of the valve stem. The flanks of the groove are all parallel to each other. Such helical grooves are therefore not suitable for receiving and securing a dispense adapter equipped with a mating thread. Screwing the adapter onto such a thread would be rather difficult due to the high friction, and since the internal pressure of the can would press the male thread against the flank facing the container, the resulting joint would not be airtight, thereby A continuous fluid channel is opened along the side facing away from the container.

In a preferred embodiment, the ridges (1F) and roots (1rt) have a width comprised between 0.1 and 3 mm, preferably between 0.3 and 1.5 mm, most preferably between 0.5 and 1.0 mm . The pitch (distance between two adjacent ridges) is preferably comprised between 0.5 and 8.0 mm, more preferably between 2.0 and 7.0 mm, most preferably about 5 mm ± 1.0 mm. The depth of the groove (ie the distance from ridge to root measured along the radius of the central hole) is of the order of 0.2 to 0.5 mm, preferably comprised between 0.2 and 0.4 mm. All dimensions stated above are measured in a section parallel to the axis of the bore as illustrated in FIG. 5 .

Grommet (2)

The valve of the present invention comprises a grommet (2) made of elastic material (eg elastomer). This grommet is used to ensure the airtightness of the valve so that (on the one hand) the valve stem (1) forms a seal with (on the other hand) the cup opening (defined below). The grommet has a hollow tubular portion (2A) defining a central through hole that snugly and tightly surrounds the tubular portion of the valve stem (1A) contained between the stem flange (1D) and the stem end base. (1B), and at the first end facing the interior of the container the grommet includes an annular flange portion (2B) having a diameter greater than that of the stem base (1B) , the lower surface of the flange portion (2B) seals against the top surface of the stem flange (1B).

The grommet (2) can be made of any elastomer such as neoprene or thermoplastic elastomer (TPE) with the required mechanical and chemical resistance.

The bottom section of the central bore of the grommet (2) may comprise a recess to free up the at least one opening (1E) of the valve stem (1).

Valve cup (3)

The valve of the invention comprises a cup (3) for tightly closing the container. The cup is made from a thin, generally annular plate comprising a first inner surface (3in) and a second outer surface (3out). The cup is provided with a through opening approximately in the center of the cup. These grommets protrude on both sides of the through-opening and ensure the airtightness of the system. The opening of the cup preferably includes a rounded edge to substantially reduce wear of the grommet (2) against said edge when the valve is in use.

As illustrated in Figure 4, the peripheral edge (3B) of the cup is adapted to be sealingly secured to the upper opening of a container. The cup (3) may be made of stainless steel, aluminium, low grade steel or other material such as tin coated steel plate possibly coated for oxidation resistance and aesthetic reasons.

The container preferably comprises a flange (7G) adapted to grip the gripping means (5G) of the dispensing adapter (5). Flange (7G) may be provided directly on the cup, (for example) at the location where it is connected to the tank opening, or the flange may be of an insert (7) fixed to the cup part, as shown in Figure 4. Preferably, the insert (7) also comprises an externally threaded portion adapted to secure a dispensing gun directly to the canister rather than to the valve.

In order to reduce the height-to-volume ratio H/V of the container, the cup (3) preferably comprises a substantially flat section (3A) between the central through-hole and the peripheral edge (3B) so as not to intrude to the depth of the volume of the container.

Use of Tilt or Gun Valves

At rest, the valve is gas-tight when mounted on a pressure vessel such as an aerosol can. All interfaces between the grommet and the cup, and between the grommet and the valve stem are sealed such that there is no fluid communication between the interior of the can and the surrounding environment. The internal pressure of the container ensures that the base (1B) of the stem is pressed against the lower surface of the flange (2B) of the grommet, which in turn is in sealing contact with the inner surface (3in) of the cup. As shown in Figure 1(b), when the stem (1) is tilted and/or pressed down, the grommet (2) is bent and compressed, and the base (1B) of the stem and the grommet The seal between the lower surfaces of the flanges (2B) is broken allowing the liquid contained in the container to flow out through the stem opening (1E) and through the hole (1C) at the stem outlet to the surrounding environment (see black arrow).

As illustrated in Figure 1, with such short and straight valve stems, it is not practical to tilt and/or press down on the valve stem. For this reason, a dispensing adapter is often used that includes actuation means to facilitate actuation of the valve (i.e., by tilting and/or pressing down) and a dispensing conduit to improve dispensing accuracy and allow for greater Complex locations are assigned. Two main types of such dispensing adapters can be distinguished: (a) disposable dispensing adapters delivered with each canister, and (b) dispensing guns which are reusable and more suitable for professional users. The valve and pressurized tank of the present application can be used indiscriminately with both types of dispense adapters.

Disposable Dispensing Adapter

The distribution adapter according to the invention comprises:

(a) a hollow dispensing tube (5C) having a first dispensing end (5 outer) and a second connecting end (5 inner),

(b) Actuating means (5A) secured laterally to the dispensing pipe and allowing actuation of the valve when in position.

The second connection end (inside 5) of the dispensing tube (5C) of the dispensing adapter according to the invention comprises an external thread (5F) matching the internally threaded part (1F) of the valve stem to which it is to be connected. This configuration is advantageous in many ways. Like the internal thread (1F) of the valve stem discussed above, the external thread (5F) is defined by a continuous helical groove on the inner surface of the central bore (1C) of the valve stem. The ridge, root and pitch dimensions of the external thread (5F) should match the corresponding root, ridge and pitch dimensions of the stem's internal thread (1F), as discussed above.

First, it is relatively easy for lay users who are not necessarily accustomed to handling pressurized tanks of this type to attach the disposable dispenser (5) to the valve without inadvertently actuating the valve during the process . This is significantly better than snap fit or engaging pin systems. The present invention is also superior to screwing systems consisting of a valve stem comprising an external threaded portion and a dispensing pipe end (inside 5 ) comprising an internal thread for the following reasons.

Second, the connection end of a corresponding dispense adapter must include a sleeve that includes an internally threaded portion to fit the externally threaded portion of the valve stem. This sleeve may restrict the freedom of tilting and/or pressing of the valve, especially if the cup is deep or an insert (7) is used.

Third, in order to have a satisfactory connection between the distribution adapter and the valve stem, the threaded portion must have a minimum length, which may be disadvantageously increased if the threaded portion is outside the valve stem The length of the stem, which is not an issue when the threaded portion is inside, because the through hole is longer than the stem portion of the grommet extending beyond the outside of the container.

Fourth, the same valve stem can be used indiscriminately with a disposable adapter and with a dispensing gun, the former requiring a threaded portion to secure the disposable adapter to the valve, and the latter requiring a smooth outer wall of the valve stem For forming a sealing contact between the gun and the valve.

The actuating means (5A) of the dispensing adapter (5) is preferably in the shape of a handle extending transversely from the dispensing tube and adapted to be grasped by fingers while the thumb and palm grasp the canister. By pressing down on the actuator with a closed fist, the valve can be tilted with little effort due to the greater leverage provided by the actuator (5A). To achieve this effect, the actuating device can be equipped with an ergonomic handle to ensure a good grip and prevent slippage of the fingers, especially the index and middle fingers.

In a preferred embodiment, the dispensing adapter of the invention further comprises a gripping means (5B, 5G) secured laterally to the dispensing tube substantially opposite to the actuating means (5A), said A second gripping end (5G) of the gripping device is adapted to grip a flange (7G) of a pressurized container, while the second connecting end (5) of the dispensing tube is screwed on said container (6 ) on the distribution valve. The gripping end (5G) of the gripping means (5B) may consist of a hook-like formation adapted to be hooked on a recess located under a flange (7G) of the tank structure. For example, the tank structure may comprise an annular insert (7) as shown in Figure 4, which is secured to the tank cup (3) and includes a flange (7G), preferably equipped with There is a recess to allow a good grip by the gripping end (5G) of the gripping means (5B) of the dispense adapter. The insert ( 7 ) may also comprise an externally threaded portion ( 7F ) for allowing the fixing of a dispensing gun as used by professionals. A fixed hinge point is formed at the level where the gripping end (5G) is engaged into the flange (7G) of the tank structure when the gripping means are in the gripping position, and actuation of the actuating means will cause the The cantilever of the adapter bends, which exerts a combined flexural and compressive force on the valve. Applying a compressive force component to a tilt valve when actuating the valve has the advantage of relieving the force exerted by the stem end (1B) on the grommet flange (2B) when the stem (1) is tilted. pressure.

In an advantageous embodiment, the orientation of the dispensing tubing (5C) of the dispensing adapter (5) can be changed, such as by allowing a certain bend in the tubing (e.g. by using a length of pleated tubing as in a straw for soda) , or by allowing a certain rotation of the dispensing conduit relative to the container.

In yet another advantageous embodiment, the adapter may comprise elastic means in the vicinity of the external thread (5F), suitable for snapping in the rod at a position corresponding to a complete and airtight engagement of the adapter Snap fit into a corresponding indentation on the outer wall of the valve stem. The elastic means may be a protrusion extending from one of the plurality of side arms (50) in the direction of the thread to meet the side of the thread. The flexibility of the side arms (50) imparts elasticity to the system. The elastic snap fit system is not necessarily secure as it is not used as a securing means, but only as an audible signal to inform the user that the adapter does not need to be screwed any tighter into the rod.

Combine in the same package a valve as discussed above (the valve has a valve stem (1) equipped with an internally threaded part (1F)) and a dispense adapter as discussed above (the dispense adapter An advantage of having a connection end equipped with a mating female threaded portion (5F)) is that the same package can be sold to occasional DIY consumers who can use the pressurized can with the same Used with the disposable dispensing adapter supplied with the press can, it can also be sold to professionals who prefer to use more complex dispensing guns for their jobs. Such packs or kits are particularly suitable for dispensing moisture-reactive liquids, such as a polyurethane precursor.

The tubular portion (1A) of the valve stem (1) preferably includes a flange (1D) for holding the grommet (2) in place. In a preferred embodiment, the top surface of said flange ( 1D ), ie the surface facing the dispensing outlet side, is frusto-conical. This geometry enhances the airtightness of the connection between the valve stem and the distribution adapter (5), provided that this connection end (inside 5) of the distribution The adapter is screwed onto the stem to bring the frusto-conical recess into sealing contact with the top surface of the stem flange (1D).

This kit can be used very easily to dispense a liquid from this container simply by:

(a) provide a kit of parts as discussed above;

(b) Screw the external thread of the dispense adapter (5) onto the internal thread of the valve stem (1);

(c) pressing the actuating means of the dispense adapter with a finger of the hand to orient the dispensing tip of the dispense adapter toward a target, and

(d) Dispensing the liquid onto the target.

Screwing the external thread of the dispensing adapter (5) onto the internal thread of the valve stem (1) reduces any undesired spillage of the contents of the tank, since no pressure is required to connect it and the user is in the process of A good view is maintained of the inlet to the valve stem center hole (1C) and the relative alignment of the dispense adapter (5) with the valve stem. In contrast, if the user wishes to connect a dispensing gun to the valve, he can do so as usual without sealing problems at the valve level due to the uneven wall of the valve stem. This way, all consumers, hobby DIYers, and professionals can purchase the same canister and use it in the way that suits them best: with the disposable dispensing adapter supplied with the canister, or with the Use with separate dispensing guns.

Claims (14)

1. Valve stem (1) for tilt valves or gun valves in aerosol type dispensing tanks, said valve stem comprising: (a) a hollow tubular portion (1A) defining a central bore (1C) extending along a central axis from a first open end open to the surrounding atmosphere to a second opposite end, the second opposite end is closed by the next term, (b) an annular end base (1B) having a diameter greater than the diameter of the valve stem (1), (c) at least one opening (1E) located in a wall of the tubular portion (1A) adjacent to the end base (1B) and connecting the central hole (1C) with the surrounding environment, and (d) Fixing means in the form of a thread (1F) adapted to receive and airtightly secure a dispense adapter provided with a mating thread, It is characterized in that said fixing means is a screw thread (1F) defined by a continuous helical groove on the inner surface of the central hole (1C) of the stem. 2. The valve stem according to claim 1, wherein the groove has a conical cross-section parallel to the central axis, preferably, said cross-section has a substantially trapezoidal or triangular geometric shape. 3. The valve stem according to claim 1 or 2, wherein the tubular portion (1A) further comprises an outer frustoconical flange, the slope of the outer frustoconical shape facing the first open end. 4. A pressurized container (6) including a dispensing valve comprising: (a) A grommet (2) made of an elastic material that forms a seal between the container and, (b) a valve stem (1) according to any one of claims 1 to 3, The seal between the grommet (2) and the valve stem (1) can be broken by tilting and/or pressing the valve stem (1). 5. The pressurized container (6) according to the preceding claim, further comprising an externally threaded portion on the structure of the tank, which is adapted to secure a dispensing gun thereon airtight, Said threaded portion is preferably provided on an insert fixed to the jar cup (3). 6. A pressurized container (6) according to claim 4 or 5, containing a moisture reactive liquid, such as a polyurethane foam precursor. 7. Dispensing adapter (5) adapted to be connected to a dispensing valve of a pressurized container (6) according to any one of claims 4 to 6, said adapter comprising: (a) a hollow dispensing tube (5C) having a first dispensing end (5 outer) and a second connecting end (5 inner), (b) an actuating device (5A) secured laterally to the dispensing pipe and allowing actuation of the valve when in position, CHARACTERIZED IN THAT the second connection end (inside 5) of the dispensing tube comprises an external thread (5F) suitable for engaging to the valve stem of a container according to any one of claims 4 to 6 in the internal thread (1F) and adapted to secure said adapter (5) airtight to said rod in a position adapted to actuate the valve with said actuating means (5A) . 8. Dispensing adapter according to the preceding claim, further comprising a gripping means (5B, 5G) secured laterally to the dispensing tube substantially opposite the actuating means (5A), A second end (5G) of said gripping means is adapted to grip a flange (7G) of a pressurized container, while a second connecting end (5) of the dispensing tube is screwed on said container (6 ) on the dispensing valve. 9. Dispensing adapter according to claim 7 or 8, wherein the dispensing tube is not straight and preferably the orientation of the first dispensing end can be changed. 10. A kit of parts for dispensing a liquid from a pressurized container, the kit of parts comprising: (a) a pressurized container according to any one of claims 4 to 6; (b) a distribution adapter according to any one of claims 7 to 9; This makes the internal thread (1F) of the valve stem (1) match the external thread (5F) of the second connection end of the adapter (5). 11. The kit of parts according to the preceding claim, wherein the tubular portion (1A) of the valve stem (1) further comprises an outer frustoconical flange, the slope of the outer frustoconical flange faces the The first open end, and the dispense adapter includes a mating surface that allows a tight seal to be formed with the stem valve when the second connection end of the adapter's dispense tube is screwed onto the stem valve. 12. A kit of parts according to claim 10 or 11, wherein the adapter is according to claim 7 and forms a lever to facilitate actuation of the valve, said lever consisting of a fixed point which is formed by A gripping point is formed between the flange of the canister and the gripping means of the adapter, and the lever extends to the actuating means, between these two points the second connection end of the dispensing tube is positioned. 13. A kit of parts according to any one of claims 10 to 12, wherein the container contains a moisture reactive liquid, such as a polyurethane foam precursor. 14. A method for dispensing a liquid from a pressurized tank, the method comprising the steps of: (a) providing a kit of parts according to any one of claims 10 to 13; (b) screw the external thread (5F) of the dispense adapter onto the internal thread (1F) of the stem (1), (c) pressing the actuating means (5A) of the dispense adapter with a finger of the hand, orienting the dispensing tip (5A) of the dispense adapter towards a target, and (d) Dispensing the liquid onto the target.

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