ES2768026T3 - Dosing valve for pressure bottle - Google Patents

Abstract

Dosing valve (1) for pressure flask, comprising a valve body (9) inside which a clapper (4) can slide, as well as a dosing chamber (7), the clapper (4) being able to move between a closed position in which, in the mounted state on a bottle, the dosing chamber (7) is in contact with the inside of the bottle and isolated from the outside of the bottle, and an open position in which, in the mounted state, the chamber Dosing chamber (7) is isolated from the inside of the bottle and in contact with the outside of the bottle, the dosing chamber (7) being fixed at its upper end to the part of the valve body (9) located, in the assembled state, inside the bottle, an inlet passage (99, 981, 714, 712) being provided that communicates the interior of the bottle with the dosing chamber and an outlet passage (712, 714, 442, 443, 51b, 45, 42) that communicates the dosing chamber with the outside of the valve, with some med Inlet obstruction devices to seal the inlet passage when the flap (4) is in the open position and outlet obstruction means are provided to seal the outlet passage when the flap (4) is in the closed position characterized in that the clapper can be moved beyond the open position to a third position, called the short-circuited position, a third step (931, 94, 31, 48, 47), called the short-circuit step, being provided to communicate the interior of the bottle with the exterior of the valve, short-circuit sealing means (5a) being provided to obstruct the short-circuit passage when the clapper (4) is in the closed position or in the open position.

Description

DESCRIPTION

Dosing valve for pressure bottle

The invention relates to a pressure bottle dosing valve according to the preamble of claim 1.

The dosing valve of the invention is intended for a pressure bottle. Dosing devices for pressure bottle valves are commonly used to deliver a predetermined quantity of a product. The product to be distributed is in a bottle that contains a propellant gas. The product is either in direct contact with the propellant gas, or contained in a flexible bag immersed within the propellant gas. Different types of dosing devices for pressure bottle valves are known.

For example, EP 1 099 647 A1 proposes a dosing device provided with a dosing chamber located downstream of the valve, placed on the stem (stem) of the bottle valve. The dosing chamber is made up of a cylinder inside which a piston slides. The bottom of the cylinder is provided with a hole that is in direct contact with the outlet of the valve stem. The piston is also provided with a hole that continues through an axial tube that slides inside a safety element in which a second valve is located. To extract a dose of product, it is first necessary to move the cylinder of the dosing chamber down so that it rests on the valve stem and thus opens the latter. Pressurized product leaving the bottle valve enters the dosing chamber pushing the piston up. The product also penetrates into the tube leading to the outlet valve of the safety element. Once the dosing chamber is full, the cylinder is returned to the rest position to again clog the bottle valve. The valve of the safety element can also be actuated by pressing on a traditional diffuser. To move the cylinder down in order to fill the dosing chamber, a ring must be turned in which two inclined guide grooves are formed and into which two peripheral projections of the cylinder penetrate. Thus, when the projections are at the top of the ring grooves, the cylinder is in the high position and does not rest on the valve stem of the bottle. Conversely, when these are at the bottom, the cylinder moves downwards and rests on the stem, causing the bottle valve to open. Consequently, to extract a dose, it is necessary to first rotate the ring a first time to fill the dosing chamber and then a second time to obstruct the bottle valve. Next, a diffuser at the top of the safety element must be pressed to open the second valve. This device is therefore not very easy to use. Also, you need two different valves.

EP 0642 992 A1 discloses a dosing device intended to be mounted in the neck opening of a container containing a product to be dispensed. The dosing device is equipped with a valve comprising a dosing chamber and a stem. In a first stem position, the dosing chamber is in contact with the inside of the container and is filled with a given quantity of product. In a second stem position, the dosing chamber is isolated from the inside of the container and in contact with the outside, allowing the expulsion of the product it contains. For this purpose, the dosing chamber is axially delimited, on the one hand, by an annular clapper gasket and, on the other hand, by an annular gasket. The stem crosses the two together. This comprises a first distribution channel arranged axially and open downwards and upwards by means of two radial openings. It comprises a second axially arranged distribution channel, which has a radial opening on the side facing the first channel and an axial opening on the free end side of the stem. In the rest position, maintained by a spring, the stem is placed in such a way that the upper opening of the first channel is located inside the dosing chamber, between the two joints, while the radial opening of the second channel is closed by the clapper seal. The lower opening of the first channel empties into the bottle. In that position, the dosing chamber is filled with the product in the container through the first channel from the moment the bottle is turned upside down. If the user presses on the stem against the action of the spring, the radial openings move. The upper opening of the first channel is sealed by means of the seal while the radial opening of the second channel opens into the dosing chamber. The product, mixed with the propellant gas, is expelled from the dosing chamber under the effect of pressure through the second channel. This device requires the bottle to be turned upside down to use it.

DE 79 14 704 U1 discloses a dosing device whose dosing chamber is formed by a cavity closed by an elastic wall. Depending on the model, the cavity has a hemispherical or diabolo shape. The submerged elastic wall is subjected to the pressure that prevails inside the pressure bottle. From the moment the dosing chamber is in contact with the outside, the elastic wall is pushed into the cavity causing its contents to be ejected.

Document FR 1503684 A discloses a dosing device intended to be mounted on the valve body, inside the bottle. The device is provided with a dosing chamber that opens into the valve body. To make a ready-to-use bottle, you have to fill the container with the desired liquid, fit the valve and then introduce the gas through the outlet passage. An opening is provided in the tube connecting the dosing chamber to the valve body. This opening is surrounded by an elastic sleeve that expands under the effect of pressure and thus allows gas to escape into the container.

None of the bottles that have been presented allows the product to be introduced into the bottle through the valve, as is, however, usual in the case of the bottles provided with a simple valve. In the same way, none of these bottles allows the extraction of a quantity greater than that released by the dosing chamber, other than by operating the valve several times in succession.

The objective of the invention is to develop a dosing device for a pressure bottle valve that, although provided with a dosing chamber, can be filled through the valve. Another object of the invention is that there is the possibility of extracting not only a dose determined by the dosing chamber, but also a different dose from that imposed by the dosing chamber without it being necessary to operate the valve several times. A third objective is to allow the same valve to be used for face-up extraction flasks and for face-down extraction flasks.

This objective is achieved according to the invention because the clapper can be moved beyond the open position to a third position, called a short-circuited position, a third step, called a short-circuit step, being intended to communicate the inside of the bottle with outside the valve, a short-circuit sealing means being provided to obstruct the short-circuit passage when the clapper is in the closed position or in the open position. In the short-circuited position, a larger quantity of product can be withdrawn than that imposed by the volume of the dosing chamber. Similarly, the bottle can be filled through that shorting step.

It is preferable that the inlet clogging means and / or the outlet clogging means be in the closed position when the clapper is in the shorted position if the short circuit path does not pass through at least part of the inlet passage and / or of the exit step. Similarly, it is preferable that the short-circuit passage connects the inside of the bottle with the outside of the valve without going through the dosing chamber.

It is preferable that the inlet clogging means and the outlet clogging means are independent of each other.

In a preferred embodiment of the invention, the inlet passage consists of at least one hole made in the wall of the valve body, in an area that is in contact with the inside of the bottle or bag, by a hole made in a wall located inside the valve body and through a hole made in the wall of the dosing chamber and the inlet obstruction means are constituted by the lower end of the clapper which has the shape of a dowel cylindrical and whose radial section corresponds to the interior dimensions of the hole in the wall in such a way that, when the pin penetrates inside that hole, it closes it hermetically, the wall preferably having the shape of a flange that ends in shape funnel facing the dosing chamber. In order to reinforce the sealing of the inlet obstruction means, it is preferable to place a sealing means, preferably an O-ring, below the hole made in the wall. In this way, when the stem comes into contact with the hole in the wall of the valve body, it also rests against the O-ring.

The outlet passage is preferably formed by a hole made in a wall of the dosing chamber, by a hole made in a wall located inside the valve body, by a lower central channel and an upper central channel made in the clapper and separated from each other by a barrier, at least one hole being formed in the clapper wall communicating the inside of the upper central channel with the outside of the clapper and at least one hole being formed in the clapper wall communicating the interior of the lower central channel with the exterior of the clapper, a communication passage being provided to communicate the orifice (s) with the orifice (s), and the outlet obstruction means are formed by a sealing gasket formed by a wall annular inside which the clapper can slide, the inner face of the sealing gasket presenting at least one annular groove whose height is at least equal to the vertical distance that separates the orifices made in the upper central channel and the orifices made in the lower central channel, the orifices of the upper central channel and / or the orifices of the lower central channel being closed on the face inside the annular wall when the valve is in the closed position, thus closing the outlet passage, and the orifice of the upper central channel and the orifice of the lower central channel opening into the annular groove when the valve is in the open position, thereby freeing the exit passage.

It is preferable that the dosing chamber comprises a cylinder whose end opposite the valve body, called the bottom, is closed by a radial wall, called the bottom, and the end facing the valve body, called the top, is closed by a radial wall, called upper, a piston being able to slide inside the cylinder between these two radial walls defining a dosing volume.

In that case, the upper radial wall of the dosing chamber may be provided with an opening, the piston being able to slide between the two radial walls of the cylinder, a spring being provided between the radial wall bottom of the dosing chamber and the piston to push the piston, in the absence of other stresses, against the upper radial wall provided with the opening.

In order to allow the introduction of the piston into the dosing chamber, it is preferable that the cylinder that forms the dosing chamber, on the one hand, and its upper radial wall and / or its lower radial wall, on the other hand, constitute different parts that can be joined or separated from each other, means being provided to fix said wall on the cylinder.

In order to separate the propellant gas and the product, a flexible bag can be welded on the valve body, enclosing the dosing chamber, as well as the beginning of the inlet, outlet and, if applicable, short circuit. Thus, when a bag is provided, the inlet, outlet, and short-circuit paths flow upstream not into the bottle, but into the bag. With this bag, the valve can be used regardless of the position of the bottle.

Specifically, the clapper can be formed by a first cylindrical wall, called the upper one, that forms a first axial channel, called the upper one, and a second cylindrical wall that forms a second axial channel, the two axial channels being isolated from each other by a barrier the upper channel being open at its upper end by an axial opening and on the side of the barrier by at least one radial opening leading to the outer face of the clapper, the lower channel being open at its lower end by an axial opening and on the side of the barrier by at least one radial opening leading to the outer face of the clapper, the clapper preferably being provided with at least one annular stop on its circumference to limit its movement inside the valve body towards the outside or inside.

In parallel, the valve body may be provided with a sealing gasket arranged in the valve body so that, in the closed position of the valve, the radial hole (s) of the upper channel of the valve are at the height of the sealing gasket, closed by the latter, the annular stop leaning tightly against that sealing gasket.

When the valve must allow a short circuit in the dosing chamber, it is preferable to provide the clapper with a third cylindrical wall that partially surrounds at least the first cylindrical wall and concentric with it, forming an annular channel, said annular channel is isolated from the other two and provided with an axial opening at its so-called upper end and with at least one radial hole that connects the inside of the annular channel and the outside of the clapper. The valve body and the clapper are therefore dimensioned so that the clapper can move beyond the open position to a so-called short-circuited position, and the valve body is provided with a clapper gasket positioned in the position opposite to the dosing chamber with respect to the sealing gasket and located in such a way that in the assembled state the valve, the radial hole (s) of the annular channel are located, in the closed position of the valve, on the outside of the bottle, which in the open position of the valve, the radial holes or holes in the annular channel are located in front of the clapper seal, closed by the latter, or outside the bottle, and that in the short-circuited position of the valve, the hole or holes Radials of the annular channel are located on the side of the clapper joint opposite the outer side.

At least one lateral channel can be provided on the outer face of the valve body, said lateral channel being provided with a first opening that opens, in the assembled state, into the bottle or bag, and a second opening that it opens into the valve body between the clapper seal and the seal. When the valve is provided with a flexible bag, it is welded onto the valve body by enclosing the first opening of the side channel (s) of the valve body such that the side channel (s) communicate the interior of the bag with the inside of the valve body between the clapper seal and the seal.

The invention is described in more detail below by means of an exemplary embodiment which is presented in the following figures, which show:

Figure 1: a side view, in section, of the dosing valve as a whole;

Figure 2: an exploded view of the dosing valve;

Figure 3: An enlarged sectional view of the valve in the closed position (a) front view and (b) side view;

Figure 4: An enlarged sectional view of the valve in the open position (a) front view and (b) side view; Figure 5: An enlarged sectional view of the valve in the shorted position (a) front view and (b) side view;

Figure 6: the tie (a) seen in perspective and (b) seen in section;

Figure 7: the sealing gasket (a) perspective view and (b) sectional view;

Figure 8: the dosing chamber lid (a) perspective view from above and (b) perspective view from below;

Figure 9: the bottom of the dosing chamber (a) perspective view from above and (b) perspective view from below;

Figure 10: The valve body seen (a) in perspective from above, (b) in perspective from below, (c) in front section, (d) in side section and (e) in inclined perspective;

Figure 11: the stem seen (a) in front section, (b) in side section, (c) in perspective;

Figure 12: the piston seen (a) in perspective from above, (b) seen in perspective from below and (c) seen in section.

For the sake of clarity of description, spatial references such as "bottom" and "top" are used, or "inside the bottle" and "outside the bottle". It should be noted that the valve is manufactured and sold independently of the bottle and that the protection concerns in particular the valve alone, without bottle. Consequently, these references are made in relation to the valve as it is intended to be used mounted on a bottle whose valve is placed on top of the bottle. This does not prevent the valve from being used in the reverse position, that is, with the valve under the bottle, or in any other position.

The valve (1) is intended to be fixed on a rigid bottle, not shown, by means of fixing means such as a cup (2). A gasket, called external (21), is placed between the neck of the bottle and the cup (2) to guarantee its tightness. Classically, the valve (1) is fixed on the cupola (22) of the cup (2). The valve (1) basically consists of:

- a valve body (9) fixed to the dome (22) of the coupling (2);

- a clapper, generally called stem (4), located in the body of the valve (9) within which it can move axially between a closed position and at least a first open position;

- a tie (3);

- two internal joints (5a, 5b);

- a dosing chamber (7).

The valve generally comprises an inner bag (11) that allows the product to be separated from the propellant gas.

The valve body (9) is formed by an upper part (91), which has the shape of a cylindrical crown, which is intended to be fixed in the cupola (22) of the cup (2). An internal gasket (5a) of the clapper is placed between the front face of that upper part (91) and the bottom of the dome (22) in order to guarantee sealing. This sealing is improved by means of the frusto-conical shape of the front face of that upper part (91). That upper crown (91) of the valve body (9) is prolonged by a practically cylindrical main part (92).

The main part (92) is crossed from side to side by an axial channel (95). This channel is divided into an upper section and a lower section separated by a radial flange (98) oriented inwards and provided with a central hole. The upper section is provided with two sets of radial ribs oriented towards the center of the axial channel (95). The first set of radial ribs (96) forms, on the one hand, at its upper part, a stop for a second internal seal, called a seal (5b) described below, and, on the other hand, a guide for the sliding of the stem (4). The second set of radial ribs (97) also forms a stop for a stem flange (4). The first set of ribs (96) is located above the second set (97). The product can circulate between the ribs. The free ends facing the center of the ribs of the first set (96) are further away from the central axis of the valve body than the free ends of the ribs of the second set (97).

Two radial holes (99) are made in the wall of the main element (92), above the flange (98) located inside the valve body. This flange (98) continues on a funnel part (981) that tapers downward.

The outer face of the valve body (9) has two radial fins (93). These fins have, in the radial plane of the valve body, a V-shaped section, the V-wings resting more or less tangentially on the cylindrical part of the main element (92). Those two fins (93) are arranged opposite each other and are hollow. In this way, a lateral channel (931) open in its lower part (opposite side to the upper crown) and closed in the upper part is formed inside each fin (93). Each channel (931) is provided in its upper part with a hole (94) that opens into the upper section of the axial channel (95) slightly below the upper crown (91), but above the seat for the internal seal of tightness (5b). The holes (94) thus communicate each channel (931) located inside the fins with the space located inside the upper crown (91).

The flexible bag (11) is fixed, for example, by welding, on the outer face of the main part (92). The bag (11) is closed on all sides and can only communicate with the outside through the valve. By means of this bag, the product to be diffused can be separated from the propellant gas outside it. However, this bag could be dispensed with perfectly.

The stem (4) has a basically cylindrical outer shape and has a first cylindrical wall (41) that forms a upper central channel (42) opened at its upper end by an axial opening and a second cylindrical wall (44), which forms a lower central channel (442) open at its lower end by an axial opening. The two central channels (42, 442) are isolated from each other by a barrier (43). The second cylindrical wall forms a cylindrical pin (44). The upper part of the outer face of the pin, that is to say on the side of the barrier (43), has a circular rim (441). The internal diameter of the narrow part of the funnel (981) corresponds to the external diameter of the stem (44) of the stem (4).

A first set of two radial holes (45) is formed in the first wall (41) of the stem (4), near the lower end of the central channel (42). Those first radial holes (45) therefore communicate the interior of the central channel (42) with the outer face of the stem (4). In the same way, the second cylindrical wall that forms the spike (44) is open in its upper part, near the barrier (43), by means of a second set of two radial holes (443). Those two radial holes open below the flange (441).

The stem (4) is provided, on the other hand, with a third cylindrical wall (46) concentric with the first (41) surrounding it in such a way that it forms an annular channel (47), concentric with the upper central channel (42). That annular channel (47) is open at its upper end through an axial opening and closed at the bottom. Its length is such that the first radial holes (45) do not pass through it. A third set of two radial holes (48) passes through the third cylindrical wall (46) in such a way that it communicates the interior of the annular channel (47) with the exterior of the stem (4). The holes (48) of that third set open above the holes (45, 443) of the first and second sets.

The stem (4) is also provided with two circular stops (49a, 49b) located on its periphery. The outer diameter of the first stop (49a) practically corresponds to the diameter of the cylinder formed by the internal ends of the first part of the ribs (96) of the axial channel (95) of the valve body (9). The outer diameter of the second stop (49b) practically corresponds to the inner diameter of the tie rod (3). The first stop (49a) is below the second (49b).

In the assembled state, the stem is located in the valve body inside the axial channel (95) within which it can move. The movement of the stem is limited between two final positions, the high or closed position and the low position or short position. In the lower part, that is to say in the short-circuit position, the movement is limited by the first stop (49a) that rests on the upper part of the second set of ribs (97) while, in the upper part, that is to say in the closed position, the movement is limited by the second stop (49b) that rests against the internal gasket of the clapper (5a) located in the dome (22) of the cup (2). In that position, movement is also limited by the first stop (49a) that rests on the internal seal of the chamber (5b).

The tie rod (3) is formed by a hollow cylinder provided on its upper part with radial ribs (31) facing outwards.

A dosing chamber (7) is fixed by suitable means on the valve body (9), preferably at the height of the lower section. The dosing chamber is basically made up of a cover (71) and a bottom (72) inside which a piston (73) slides. This piston is subjected to the pressure of a spring (74) (of which only the final turns have been shown) which tends, in the absence of other tension, to push it against the cover (71).

The lid (71) of the dosing chamber is basically formed by a radial wall (711) provided with a central opening (712) and by two cylindrical walls (713, 714). The first cylindrical wall (713) extends the radial wall (711) downward. The second cylindrical wall (714), concentric with the first, extends upward around the central opening (712) of the radial wall (711). In the assembled state, the upper end of the second cylindrical wall (714) rests against the underside of the funnel part (981) of the valve body, preferably inserting an O-ring (717) or any other sealing means suitable. A third cylindrical wall (715) concentric with the first two and surrounding the second is provided to receive the means for fixing the chamber (7) on the valve, preferably at the lower end of the valve body. In the example presented in this document, the fixing means are formed, on the one hand, by two radial arcs of a circle placed on the external face of the valve body (9), at its lower end, and by two radial flanges (718) oriented towards the center and placed at the upper end of the internal face of the third cylindrical wall (715). In the assembled state, the two pins of the valve body fit behind the two flanges (718) of the third radial wall of the lid of the dosing chamber. The tightness is reinforced by the presence of the O-ring (717).

The bottom (72) of the dosing chamber is formed by a cylindrical wall (721) closed at the bottom by a radial wall (723). The internal diameter of the cylindrical wall (721) of the bottom (72) practically corresponds to the external diameter of the first cylindrical wall (713) of the cover (71). Those two elements of the dosing chamber can be joined together by any suitable means. In the example presented in this document, they are joined by means of four circular arc dowels (723) distributed regularly by the periphery of the cylindrical wall (721) of the bottom (72) and by as many flanges (716 ) made on the first wall cylindrical (713) of the cover (71) and behind which the pins (723) are fitted. Of course, it can also be the lower radial wall of the dosing chamber that is separated from the rest of the dosing chamber. The piston (73) is formed essentially by a radial wall solid (731) (thus without passage opening contrast the valve document ^and P 1099 647 A1), fixed on a cylindrical crown (732), the spring ( 74) by inserting itself inside that cylindrical crown to rest on the underside of the radial wall or, in the case presented in this document, by radial ribs (733) shorter than the cylindrical crown (732) and which they extend from the radial wall. A flange (734) made on the outer face of the cylindrical crown (732) guarantees the seal between the piston (73) and the inner face of the cylindrical wall (721) of the bottom (72) of the dosing chamber. The air contained inside the bottom (72) below the piston (73) is compressed when the chamber is full.

The annular clapper seal (5a) is located at the bottom of the dome, between it and the upper face of the valve body.

The sealing gasket (5b) is located inside the axial channel (95) of the valve body, resting on the upper face of the ribs of the first set (96). It is held in that position by means of the tie (3). The sealing gasket (5b) has an annular shape. Its outer diameter corresponds to the inner diameter of the axial channel (95) above the first set of ribs (96). Its inner diameter corresponds to the outer diameter of the stem (4) at the height of the first radial holes (45) and the second radial holes (443). On its inner face, the sealing gasket (5b) has two parallel radial grooves (51b, 52b) located one above the other. The height of the lower groove (51b) is greater than or equal to the axial distance that separates the first radial holes (45) and the second radial holes (443) from the stem. In practice, the second radial groove (52b) which does not perform any function could be dispensed with. Its presence is only justified for reasons of simplification of the valve mounting: the part, being symmetrical with respect to the radial median plane, can be mounted in either direction on the valve body.

The valve in the assembled state, are located, from the bottom up, the dosing chamber (7) fixed on the lower section of the valve body (9). The stem (4) is located inside the valve body (9), pushed in the high position by a spring (8) that rests, on the one hand, on the flange (441) of the stem (4) and , on the other hand, on the upper face of the flange (98). The sealing gasket (5b) is blocked inside the axial channel (95) between the vertex of the ribs of the first set (96) and the tie rod (3), which in turn is placed in the upper part of the axial channel (95). Finally, the upper crown (91) of the valve body is fixed to the cup (2), for example, by crimping, inserting the clapper seal (5a) that surrounds the upper section of the stem (4). This joint guarantees in particular the tightness between the area below it and the area above it.

In order to allow the product contained within the bag (11) or inside the bottle to enter the dosing chamber, and then exit, an inlet and an outlet passage are provided in the valve, means for obstructing entrance and exit obstruction means being provided respectively in the entrance path and in the exit path to obstruct these passages when necessary. When the respective clogging means are open, the inlet passage communicates the interior of the bag, or the interior of the bottle if there is no bag, with the dosing chamber, while the outlet passage communicates the interior of the delivery chamber. dosage with the upper central channel (42) of the stem.

The inlet passage is formed by the inlet holes (99) made in the valve body, the hole formed by the funnel part (981) of the flange (98) of the valve body and the second cylindrical wall ( 714), and then the hole (712) of the lid (71) of the dosing chamber. The entry passage can be clearly seen, for example, in figure 3b, where it is indicated with an arrow. The means of obstructing this inlet passage are formed by the herringbone lower end of the second cylindrical wall (44) of the stem which, when the stem (4) is low enough, tightly closes the opening of the part in valve body funnel (981) and o-ring (717). The closure of the inlet passage by the inlet obstruction means can be clearly seen in Figures 4b and 5b.

The outlet passage is made up of the hole formed by the hole (712) of the lid (71) of the dosing chamber, the second cylindrical wall (714), the funnel part (981) of the flange (98) of the valve body, lower center stem channel (442), second set of radial holes (443), first annular groove (51b) of seal (5b), first set of radial holes (45) and the upper central channel (42). The exit step can be clearly seen in figure 4b where it is indicated with an arrow. The means of obstructing that outlet passage are formed by the inner face of the cylindrical wall of the seal (5b) which, from the moment the two sets of radial holes (45, 443) are no longer aligned with the first annular groove (51b) constitutes a watertight barrier between these two sets of holes, thus closing the exit passage. The closure of the exit passage can be clearly seen in Figures 3b and 5b.

When the valve is in the closed position, the radial holes (48) of the third cylindrical wall (46) of the stem are located above the clapper seal (5a), that is to say on the outside of the valve. Radial Holes (45) located in the lower part of the upper central channel (42) are opposite the upper groove (52b) of the seal (5b) (or against the wall of the seal that closes them if there is no second annular groove ) while the second radial holes (443) are in front of the lower slot (51b). The two sets of radial holes are therefore isolated from each other and there is no communication between the lower central channel (442) and the upper central channel (42) of the stem (4). The stem pin (44) penetrates into the hole of the flange (98) but without contacting the bottom of the funnel part (981) and the O-ring (717). The passage between the inside of the bag (11) and the dosing chamber is therefore clear. This step is made through the radial holes (99), called inlet holes, then through the space between the funnel part (981) of the flange (98) and the lower end of the pin (55), and finally through the central hole (712) of the lid of the dosing chamber.

In this position, the product placed inside the bag and compressed, for example, at around 8 bars by the gas located outside it penetrates through the holes (99) inside the axial channel (95), passes to through the funnel part (981) surrounding the end of the stem (44) and through the central opening (712) of the lid (71) of the dosing chamber pushing the piston (73) against the action of the spring (74). On the valve body side, the product ascends through the lower axial channel (442) of the stem and fills the lower section of the valve body. However, it is blocked inside the valve body by means of the seal (5b) and at the height of the stem inside the lower groove (51b) of the seal. The product cannot, therefore, come out of the valve, but the dosing chamber is full.

When the valve is actuated, that is to say that a pressure is exerted on the upper part of the stem, it moves downwards. To empty the dosing chamber, it is planned to lower the stem to an intermediate position between the high position, closed, and the low position, short circuit.

In this intermediate position, the stem is lowered in such a way that the radial holes (48) of the third cylindrical wall of the stem are again above the clapper joint (5a). The radial holes (45) located in the lower part of the upper central channel (42) of the stem, like the radial holes (443) located in the upper part of the lower central channel (442), are in front of the lower annular groove (51b): they are therefore communicated. The lower end of the stem (44) then penetrates into the funnel portion (981) of the flange and thus seals the central hole of the flange.

In this position, the product can no longer pass from the bag (or the bottle) to the dosing chamber since the inlet passage between the radial inlet holes (99) and the dosing chamber is closed by the hermetic seal of the central hole of the flange through the pin (44). Conversely, as the dosing chamber communicates with the outside, the low pressure and spring (74) again pushes the piston (73) to the top of the dosing chamber. In this way the product is ejected. This first passes through the outlet opening (712) and the channel formed in the second cylindrical wall (714) of the cover (71), ascends through the lower channel (442) of the spike (44), passes through the holes (443) of the stem, circulates through the lower slot (51b) of the seal (5b), passes through the holes (45) located in the lower part of the upper central channel (42) of the stem, ascends through the latter and it is located outside the valve. Only the quantity of product placed inside the dosing chamber can be expelled in this way. At most, when using them for the first time, the quantity of product necessary to fill the dead volume formed by the path inside the lower central channel (442) and the upper central channel (42) may be lacking. When using it the following times, that dead volume already being filled with product, the volume expelled corresponds exactly to the volume of the dosing chamber (7).

When the pressure exerted on the valve is reduced, the spring (8) pushes the stem (4) up again, which recovers its initial position and the dosing chamber is filled again.

It should be noted that whatever the position of the stem, the product contained within the bag can be introduced into the lateral channels (931) of the flaps (93) of the valve body and pass through its holes (94) to be introduced in the space between the clapper gasket (5a) and the sealing gasket (5b). However, this space is hermetically closed and the product it contains cannot escape.

In certain cases, it may be useful to short-circuit the dosing chamber (7), for example, to extract a much higher dose of product. In that case, even greater pressure can be exerted on the upper face of the stem to force it to descend to its lower end position, beyond the previously mentioned intermediate position. In that case, the radial holes (48) of the third cylindrical wall (46) of the stem pass under the clapper seal (5a): they are, therefore, in contact with the interior of the valve body. The radial holes (45) face the lower groove (51b) of the seal, while the radial holes (443) are at the height of the first and second set of ribs (96, 97). The upper central channel 42 and the lower central channel 442 are therefore again isolated from each other. The stem (44) penetrates further into the funnel portion of the flange (98) maintaining the hermetic seal of the central hole of the flange.

In this final position, the inlet and outlet passages are closed and the dosing chamber is not only isolated from the bag (11), but is also isolated from the outside: it cannot be filled or emptied. On the contrary, the product contained inside the bag (or inside the bottle) leaves the valve through the channels fins sides. It is pushed into the lateral channels (931) of the fins (93), it goes through the holes (94) communicating the upper part of the channels (931) with the interior of the upper crown (91), it penetrates into the crown , passes through the ribs (31) of the tie (3), passes through the holes (48) made in the third cylindrical wall (46) of the stem and exits through the annular channel (47).

It should be noted that, in the final short-circuit position of the dosing chamber, the bag can also be filled during the manufacture of the pressure bottle.

If the short-circuit position is not necessary, the third cylindrical wall (46) of the stem, as well as the lateral channels (931) of the valve body can be dispensed with, although the fins can be preserved to facilitate the welding of the bag (11). The stem now only moves between the high closed position and the intermediate open position, which then becomes the second final position.

The bag is no longer indispensable either. You can consider extracting the product directly from the bottle. As it is, the valve can be used upside down (valve placed under the bottle). If, on the other hand, it must be used in the normal position (valve above the bottle), a dip tube must be provided connected to the radial openings (99) in the lower section of the valve body and to the lateral channels (931). of the fins. In the exemplary embodiment presented in this document, the radial holes (45, 443, 48, 99) are presented two by two. It may in any case not have more than one at a time, or on the contrary more than two.

The dosing valve of the invention, in particular associated with a bag (11) can be used in all positions. The presence of the spring (74) that forces the piston (73) guarantees a quick and complete exit of the product out of the dosing chamber. Since the dosing chamber is filled from above, due to the path the product follows to exit, it does not run the risk of emptying between two uses, even if you do not use a bag.

Reference list:

1 Dosing valve

11 Flexible bag

2 Cup

21 External seal

22 Dome

3 Strap

31 Radial ribs facing outward

4 Stem

41 First cylindrical wall

42 Upper central canal

43 Barrier

44 Second cylindrical wall / dowel

441 Circular flange

442 Lower central canal

443 Second set of radial holes

45 First set of radial holes

46 Third cylindrical wall

47 Annular channel

48 Third set of radial holes

49a First stop

49b Second stop

5 a) Clapper gasket

b) Seal

51b Lower annular groove

52b Upper ring groove

7 Dosing chamber

71 Cover

711 Radial wall

712 Center hole

713 First cylindrical wall

714 Second cylindrical wall

715 Third cylindrical wall

716 Bottom fixing flanges

717 O-ring

718 Fixing flange on the valve body 72 Bottom

721 Cylindrical wall

722 Radial wall

723 ears

73 Piston

731 Radial wall

732 Cylindrical crown

733 Radial ribs

734 Flange

74 Piston spring

Stem spring

Valve body

91 Upper Crown

92 Main part

93 Fins

931 Side channels

94 Holes

95 Axial Channel

96 First set of ribs

97 Second Set of Ribs

98 Flange

981 Funnel part

99 radial holes

Claims (16)

1. Dosing valve (1) for a pressure bottle, comprising a valve body (9) into which a clapper (4) can slide, as well as a dosing chamber (7), the clapper (4) being able to move between a closed position in which, in the state mounted on a bottle, the dosing chamber (7) is in contact with the inside of the bottle and isolated from the outside of the bottle, and an open position in which, in the mounted state, the dosing chamber (7) is isolated from the inside of the bottle and in contact with the outside of the bottle, the dosing chamber (7) being fixed at its upper end to the part of the valve body (9) located, in a state mounted inside the bottle, an inlet passage (99, 981, 714, 712) being provided that communicates the interior of the bottle with the dosing chamber and an outlet passage (712, 714, 442, 443, 51b, 45, 42) that communicates the dosing chamber with the outside of the valve, some inlet obstruction means to shut off the inlet passage when the clapper (4) is in the open position and outlet clogging means are provided to shut off the outlet passage when the clapper (4) is in the closed position characterized in that The clapper can be moved beyond the open position to a third position, called a short-circuited position, a third step (931, 94, 31, 48, 47), called a short-circuit step, being intended to communicate the inside of the bottle with the outside of the valve, a short-circuit sealing means (5a) being provided to obstruct the short-circuit passage when the flap (4) is in the closed position or in the open position. 2. Dosing valve (1) according to claim 1, characterized in that the short-circuit passage communicates the inside of the bottle with the outside of the valve without passing through the dosing chamber. Dosing valve (1) according to claims 1 or 2, characterized in that the inlet obstruction means and / or the outlet obstruction means are in the closed position when the clapper is in the shorted position if the passage The short-circuit does not pass through a part at least of the entrance passage and / or the exit passage. Metering valve (1) according to one of the preceding claims, characterized in that the inlet obstruction means and the outlet obstruction means are independent of each other. 5. Dosing valve (1) according to one of the preceding claims, characterized in that the inlet passage is formed by at least one hole made in the wall of the valve body, in an area that is in contact with the interior of the bottle or bag (11), a hole made in a wall (98) located inside the valve body (9) and a hole (712) made in the dosing chamber (7) and because the means of entry obstruction are formed by the lower end of the clapper that has the shape of a cylindrical pin (44) and whose radial section corresponds to the interior dimensions of the hole in the wall (98) in such a way that, when the pin penetrates inside this hole, it closes it hermetically, the wall (98) preferably presenting the shape of a flange (98) ending in the shape of a funnel (981) directed towards the dosing chamber (7). 6. Dosing valve (1) according to the preceding claim, characterized in that sealing means, preferably an O-ring (717), are located below the hole made in the wall (98). 7. Dosing valve (1) according to one of the preceding claims, characterized in that the outlet passage is formed by a hole (712) made in the dosing chamber (7), a hole made in a wall (98) located inside the valve body (9), a lower central channel (442) and an upper central channel (42) made in the clapper (4) and separated from each other by a barrier (43), being made at least one hole (45) in the clapper wall communicating the inside of the upper central channel (42) with the outside of the clapper and at least one hole (443) being made in the clapper wall (4) communicating the inside the lower central channel (442) with the outside of the clapper (4), a contacting step (51b) being provided to communicate the hole (s) (443) with the hole (s) (45), and because the outlet obstruction means are constituted by a sealing gasket (5b) constituted by or an annular wall inside which the clapper can slide, the inner face of the seal (5b) presenting at least one annular groove (51b) whose height is at least equal to the vertical distance that separates the holes (45) made in the upper central channel (42) and the hole (s) (443) made in the lower central channel (442), the hole (s) (45) of the upper central channel and / or the hole (s) (443) of the lower central channel closed by the internal face of the annular wall when the clapper is in the closed position, thus closing the outlet passage, and opening the orifice (45) of the upper central channel and the o the holes (443) of the lower center channel in the annular groove (51b) when the valve is in the open position, thereby freeing the outlet passage. 8. Dosing valve (1) according to one of the preceding claims, characterized in that the dosing chamber comprises a cylinder (721) whose end opposite the valve body, called the lower one, is closed by a radial wall (722) , called lower, and the end facing the valve body, called upper, is closed by a radial wall (711), called upper, a piston (73) being able to slide inside the cylinder (721) between those two walls Radials defining a dosing volume. 9. Dosing valve (1) according to the preceding claim, characterized in that the upper radial wall (711) of the dosing chamber is provided with an opening (712), the piston being able to slide between the two radial walls (722, 711) of the cylinder, a spring (74) being provided between the lower radial wall (722) of the dosing chamber and the piston (73) to push the latter, in the absence of other stresses, against the upper radial wall (711) provided with the opening. 10. Dosing valve (1) according to claims 8 or 9, characterized in that the cylinder (721) that forms the dosing chamber, on the one hand, and its upper radial wall (711) and / or its lower radial wall (722), on the other hand, constitute different pieces that can be joined or separated from each other, means (716, 723) being provided to fix said wall on the cylinder (721). 11. Dosing valve (1) according to one of the preceding claims, characterized in that a flexible bag (11) is welded onto the valve body (9) enclosing the dosing chamber (7) as well as the start of the input, output and if necessary short-circuit paths. 12. Dosing valve (1) according to one of the preceding claims, characterized in that the clapper (4) consists of a first cylindrical wall (41), called upper, which forms a first axial channel (42), called upper , and by a second cylindrical wall (44) that forms a second axial channel (442), the two axial channels being isolated from each other by a barrier (43), the upper channel (42) being open at its upper end by a axial opening and on the side of the barrier (43) by at least one radial opening (45) opening into the outer face of the clapper, the lower channel (442) being open at its lower end by an axial opening and in the side of the barrier (43) by at least one radial opening (443) opening into the outer face of the clapper, the clapper preferably being provided with at least one annular stop (49a, 49b) in its circumference to limit its displacement inside the valve body (9) towards the outside or inside. 13. Dosing valve (1) according to the preceding claim, characterized in that the clapper (4) is provided with a third cylindrical wall (46) that partially surrounds at least the first cylindrical wall (41) and concentric with this forming an annular channel (47), said annular channel (47) is isolated from the other two and provided with an axial opening at its so-called upper end and with at least one radial hole (48) that communicates the interior of the annular channel (47) with the outside of the clapper, because the valve body (9) and the clapper (4) are therefore dimensioned so that the clapper (4) can move beyond the open position to a position called short-circuited, and because the valve body (9) is provided with a clapper gasket (5a) positioned in the opposite position to the dosing chamber and positioned in such a way that, with the valve in the assembled state, the radial hole (s) (48 ) of the annular channel (47) are located, in the position closed of the valve, on the outside of the bottle, and that in the open position of the valve, the radial hole (s) (48) of the annular channel are located in front of the clapper seal (5a), closed by the latter, or on the outside of the bottle, and that in the short-circuited position of the valve, the radial hole (s) (48) of the annular channel (47) are located on the side of the clapper seal (5a) opposite the outer side. 14. Dosing valve (1) according to claims 12 or 13, characterized in that the valve body (9) is provided with a sealing gasket (5b) arranged in the valve body (9) so that in the closed position of the valve, the radial hole (s) of the upper channel (42) of the clapper are at the height of the seal (5b), closed by the latter, the annular stop (49a) resting in a watertight manner against that seal (5b). 15. Dosing valve (1) according to one of the preceding claims, characterized in that at least one lateral channel (931) is provided on the outer face of the valve body (9), said lateral channel (931) being provided of a first opening that opens, in an assembled state, inside the bottle or bag (11), and a second opening (94) that opens inside the valve body between the clapper seal (5a) and the sealing gasket (5b). 16. Dosing valve (1) according to one of the preceding claims, characterized in that the valve further comprises means for moving the flap (4) between the closed position and the open position.