FR3039619A1 - TAP, PRESSURIZED FLUID RESERVOIR, TANK ASSEMBLY AND FILLING TOOL - Google Patents

Abstract

Valve for a fluid reservoir under pressure comprising a connection (7) for filling and possibly withdrawal, the connection (7) forming on the body (1) a cavity intended to receive a filling tool, the circuit (3) of the tap comprising , an isolation valve (8) and a pressure expander (9), the pressure expander (9) comprising a mechanism comprising a piston (10) movable in translation along a determined longitudinal direction (A) relative to a seat for ensure the opening or closing of the circuit (3), the piston (10) being biased by a member (11) to return to the seat in a closed position of the circuit (3), an upstream end of the piston (10) opening at the bottom of the cavity delimited by the connection (7), the upstream end of the piston (10) being situated at a reference distance (L2) determined with respect to the reference surface (13) in the direction (A) longitudinal, characterized in that the dista reference (L2) is between 17 and 30mm and preferably between 22 and 27mm

Description

The present invention relates to a valve, a pressurized fluid reservoir provided with such a valve, a set of reservoirs and a filling tool. The invention more particularly relates to a valve for a pressurized fluid reservoir comprising a body provided with a first end intended to be sealingly connected to an orifice of a fluid reservoir under pressure, the body defining a fluid circuit. extending between a first end intended to communicate with the interior of a tank and a second end opening at a filling connection and possibly withdrawal, the fitting forming a cavity on the body for receiving a filling tool and / or withdrawal, the valve circuit comprising an isolation valve and a pressure regulator, the pressure regulator comprising a mechanism comprising a piston movable in translation in a longitudinal direction determined relative to a seat to ensure the opening or closing the circuit, the piston being biased by a return member towards the seat in a closing position of the circuit, an upstream end of the piston opening at the bottom of the cavity delimited by the connector to allow the mechanical actuation of the piston by the end of an axis of a connected filling / filling tool at the connection, the valve further comprising a safety mechanism preventing the transit of gas from the second end to the first end of the circuit by the single action of a fluid pressure exerted on the upstream end of the piston is that is, the piston must be moved mechanically by a tool to allow the entry of pressurized fluid for filling, the cavity of the fitting defining a reference surface for receiving a seal of a filling tool connected to said coupling, in the closed position of the piston, the upstream end of the piston being situated at a reference distance determined with respect to to the reference surface in the longitudinal direction. The invention relates in particular to the valves equipping tanks (cylinders) with pressurized gas.

The tanks of pressurized gas tanks may comprise bottles having different operating pressures: for example respectively 200b and 300bar. The tanks storing gas at 200bar may for example comprise a tap without built-in expansion valve. The user can directly connect his equipment (pressure regulator ...).

To increase the amount of gas stored, some tanks can store the gas at a higher pressure, including 300bar. In this case, because some devices of the users (pressure reducers ...) are not compatible with a pressure of 300bar, the valve can integrate a pressure reducer or pressure reducer which lowers the high pressure (300bar) to an intermediate pressure ( for example, the outlet pressure is divided by two).

For reasons of optimization of manufacturing means and compliance with standards, such valves provided for the high pressure (300bar) may have a close structure and in particular a fill and draw connection of geometry close or identical to that of the faucets provided for the relatively low pressure (200bar).

In some applications there is a risk that some tanks equipped with a valve without a pressure reducer and designed for a maximum pressure of 200bar can be filled with the higher pressure (300bar) provided for tanks equipped with valve with pressure reducer. Thus some users could be in the situation of connecting equipment (regulator ...) that would not withstand the high pressure (300bar).

To solve this problem, a known solution consists in providing different thread / tapping geometries of the filling connector according to the operating pressures of the reservoirs. However, it is not always possible to provide different geometries threading systems / tapping according to the operating pressures.

Thus, for reasons including different standards in different countries, it can still happen that a high-pressure filling tool (300bar) can accidentally fill a tank provided for a lower pressure (200bar).

An object of the present invention is to overcome all or part of the disadvantages of the prior art noted above. To this end, the valve according to the invention, furthermore in accordance with the generic definition given in the preamble above, is essentially characterized in that the reference distance is between 17 and 30 mm and preferably between 22 and 30 mm. and 27mm.

Furthermore, embodiments of the invention may include one or more of the following features: the upstream end of the piston opens at the bottom of the cavity at an orifice forming the second end of the circuit, said orifice having a diameter of between 7 mm and 10 mm, the upstream end of the piston opens at a first end of a bore formed in the body and whose second end of said bore opens at the bottom of the cavity delimited by the coupling, in the longitudinal direction, said bore has a length of between 9 and 15 mm, the bore has a diameter of between 7 mm and 10 mm, the reference surface is defined as being the location of the cavity having a determined diameter, between 10 mm and 17 mm, in particular 14 mm, - the safety mechanism comprises a check valve system ("NRV") which tends to move the piston of the pressure regulator towards its closed position when the latter is not actuated mechanically by a tool and is subjected to a fluidic overpressure at its upstream end, - the safety mechanism comprises a pressure relief valve arranged to evacuate gas to the outside of the circuit when the safety valve is subjected to a pressure greater than a determined threshold, - a portion of the connection defining the cavity is cylindrical and threaded or tapped, - a portion of the cavity of the connection comprises a frustoconical zone converging towards the bottom of the cavity in the direction of the first end of the piston, the reference surface is located at the frustoconical portion, the invention also relates to a fluid reservoir under pressure, in particular pressurized gas, provided with a valve, the valve being in compliance with to any of the above or below features. The invention also relates to an assembly comprising a plurality of reservoirs for storing fluid under pressure comprising a first group of tanks (s) intended to store pressurized fluid at a first maximum operating pressure of between 150 bar and 240 bar, in particular 200bar, the assembly comprising a second group of tanks (s) for storing fluid under pressure at a second maximum operating pressure, for example between 250 bar and 700 bar, in particular 300 bar, each tank of the assembly being provided with a valve comprising a body provided with a first end sealingly connected to an orifice of a pressurized fluid reservoir, the body of each valve defining a fluid circuit extending between a first end communicating with the interior of the reservoir in question and a second end emerging at a filling and withdrawal connection. ge, the connector forming on the body a cavity for receiving a filling and / or withdrawal tool, the valve circuit comprising, an isolation valve and a mechanism comprising a piston movable in translation in a longitudinal direction determined to ensure opening or closing the circuit, the piston being biased by a return member to a seat in a closed position of the circuit, an upstream end of the piston opening at the bottom of the cavity defined by the connector to allow mechanical actuation of the piston by an axis of a filling / withdrawal tool connected to the connection, the valve further comprising a safety mechanism preventing the gas flow from the second end to the first end of the circuit by the single action of a pressure fluid exerted on the upstream end of the piston, that is to say that the piston must be moved mechanically by a tool to allow the inlet of fluid under pressure for filling, the cavity of the connection defining a reference surface intended to receive a seal of a filling tool connected to said coupling, in the closed position of the piston, the upstream end of the piston being situated at a reference distance determined relative to the reference surface in the longitudinal direction, the reference distance for the first reservoir group (s) is between 10 mm and 17 mm, the valve of the tanks of the second group comprising a pressure regulator, the piston movable in translation in a direction forming part of the mechanism of the pressure regulator and in that the reference distance for the second group of reservoir (s) is between and 20 and 30mm and preferably between 22 and 27mm, that is to say that each valve of the second group is in accordance with any of the above characteristics or hereinafter near. The invention also relates to a filling tool for a tank comprising a body comprising an end provided with a connection head, the body of the tool incorporating a pressurized fluid supply circuit opening at the connection head, the connection head comprising dimensions and coupling members of the coupling of the valve, a seal intended to bear against the reference surface of the connection to ensure a tight connection between the filling tool and the connection the tool further comprising a pusher pin projecting from the connecting head, the distance between the end end of the pusher pin and the seal (19) being equal to the reference distance of the pusher connection is to say is between 20 and 30mm and preferably between 22 and 27mm.

According to another possible feature: - the end end of the push-piston shaft has a diameter of between 5mm and 9mm. The invention may also relate to any alternative device or method comprising any combination of the above or below features. Other particularities and advantages will appear on reading the following description, with reference to the figures in which: - Figure 1 shows a side view in vertical section, schematic and partial, of an example of a reservoir with a tap according to an example of the prior art (tap without pressure reducer provided for a relatively low pressure, for example 200 bar), - Figure 2 shows a vertical section of the valve of Figure 1 according to another section plane, illustrating the main closure mechanism of the valve, - Figure 3 shows a schematic and partial sectional view of an example of a tank provided with another valve according to an example of the prior art (valve with pressure reducer provided for relatively high pressure, for example 300bar), - Figure 4 shows a schematic and partial view, and partially in section, of an embodiment of a valve according to l FIG. 5 represents a schematic and partial sectional view illustrating the structure and operation of an exemplary embodiment of a filling and tap-off connection according to the invention, FIG. sectional, schematic and partial illustrating the cooperation of the end of a filling tool with a connection of the type of that of Figure 4, - Figure 7 shows a sectional view, schematic and partial illustrating the end of FIG. 8 is a schematic and partial cross-sectional view with a partially enlarged portion illustrating the cooperation of the end of a filling tool with a connection of the type of that of a filling tool of FIG. FIG. 1 schematically represents a group of reservoirs comprising two distinct sets.

Figures 1 and 2 illustrate a valve 1 for pressurized fluid tank according to the prior art used for tanks storing gas a specific pressure, for example 200bar.

The valve comprises a body 1 provided with a first end 2 (for example threaded) intended to be sealingly connected to an orifice (for example threaded) of a reservoir 4 of pressurized fluid.

The body 1 of the valve defines a fluid circuit 3 extending between a first end 5 intended to communicate with the interior of a tank 4 and a second end 6 opening at a connection 7 for filling (and in this example, also provided for racking).

The connector 7 forms on the body 1 a cavity (for example tapped in the case of a female connector) intended to accommodate a filling tool and / or withdrawal (eg threaded).

The circuit 3 of the valve comprises an isolation valve 8 actuated by a control member 21 (a rotary wheel in this non-limiting example because a lever or other could be envisaged).

The valve comprises a mechanism comprising a piston 10 movable in translation in a longitudinal direction A determined relative to a seat to ensure the opening or closing of the circuit 3. The piston 10 is biased by a member 11 to return to the seat in a closing position of the circuit 3.

The piston 10 is for example a piston of a residual pressure valve or a non-return valve ("NRV" for "Non Return Valve").

Without this being limiting for all that, this mechanism is for example of the type described in document FR2734041A1.

An upstream end of the piston 10 opens at the bottom of the cavity defined by the connector 7 to allow the mechanical actuation of the piston 10 by the end of an axis of a filling tool sealingly connected to the connector 7.

The cavity of the connector 7 thus defines a reference surface 13 intended to receive a seal of a filling tool connected to said connector 7. In the closed position of the piston 10, the upstream end of the piston 10 being located at a reference distance L1 determined with respect to the reference surface 13 in the longitudinal direction A.

This distance L1 is typically between 10 and 17mm, especially 15 to 16mm.

The known valve filling connections 7 for higher pressure tanks (for example 300 bar or above) are generally geometrically identical to the lower pressure valve filling connections (200bar, for example).

FIG. 3 illustrates an example of a connection of such a pressurized fluid reservoir valve according to the prior art used for reservoirs storing a relatively higher gas, for example 300 bar. The elements identical to those described above are designated by the same reference numerals and are not described a second time. The structure of the connector of Figure 3 differs from that of Figure 1 in that the piston 10 is part of a mechanism 9 of pressure relief (or pressure reduction) to lower the pressure of the gas.

As shown schematically in Figure 3, the pressure reduction can be provided via the geometry of the piston (several different sections, including three forming a pressure reduction mechanism between the two ends of the piston).

In addition, downstream of the piston 10 of the pressure reduction system, the valve comprises a relief valve 212 arranged to evacuate gas to the outside of the circuit 3 when the valve 212 safety is subjected to a pressure greater than a threshold determined.

The connection of FIG. 3 has the same or almost identical geometry as the connection of the valve of FIG. 1. In particular, in the closed position of the piston 10, the upstream end of the piston 10 of the coupling of FIG. reference distance L1 determined with respect to the reference surface 13 in the longitudinal direction A which is the same distance (or almost the same distance) as for the connection 7 of FIG.

Due to the geometries close to the connections 7, the filling tools at a high pressure (300 bar) can optionally fill the tanks (200 bar) which must not be filled at this high pressure.

It is therefore easy to understand that there remains the industrial risk that a lower pressure tank (200bar) is accidentally filled in an installation with a pressure greater than 200bar (300bar for example).

Figures 4 and 5 illustrate a partial sectional view of a valve according to the invention. This valve is largely in accordance with the valve according to Figure 3. The same elements are designated by the same reference numerals.

This valve preferably incorporates a pressure regulator 9 at the connection 7. That is to say that the gas drawn by the connector 7 (which is also used for filling) has a lowered pressure (less than or equal to 200bar for example) ) to allow the user to connect equipment (holders, flow controllers or other) compatible with the pressure delivered. For this purpose, the piston 10 may be part of a mechanism known per se, forming a pressure regulator 9 and if applicable nonreturn valve ("NRV" "Non Return Valve" and / or a residual pressure valve (" RPV "=" Residual Pressure Valve ").

This piston mechanism 10 is for example in accordance with that described in EP1158226B1 or JP2003097796A2.

As illustrated diagrammatically in FIG. 5, the valve and its connection 7 may furthermore preferably comprise a safety mechanism 12 preventing the transit of gas from the second end 6 towards the first end 5 of the circuit 3 by the single action of FIG. a fluid pressure exerted on the upstream end of the piston 10. That is to say that the piston 10 must be moved mechanically by a tool 15 to allow the entry of fluid under pressure for filling.

For example, the safety mechanism 12 comprises a check valve system ("NRV") which tends to move the piston 10 of the pressure regulator 9 to its closed position when the latter is not actuated mechanically by a tool and is subjected to a fluidic overpressure at its upstream end.

The safety mechanism 12 may further comprise a pressure relief valve 212 arranged to evacuate gas to the outside of the circuit 3 when the safety valve 212 is subjected to a pressure greater than a determined threshold. This suppressor valve 212 is preferably neutralized by the end of the filling tool 15 by closing (sealingly) a channel 22 of fluid passing through the piston 10 connecting the gas to a downstream chamber. This downstream chamber communicates with the valve 212 of overpressure. This channel 22 and this downstream chamber may optionally be part of a non-return mechanism ("NRV").

Conventionally, during the opening of the isolation valve 8 (via the control member 21), the pressurized gas rises from the tank 4 into the circuit 3 and moves the piston 10 to exit via the connector 7. C ' that is to say that the sufficient gas pressure allows the opening of a possible mechanism for maintaining a residual pressure.

The valve connection of FIGS. 4 and 5 differs essentially from that of the prior art in that the reference distance L 2 is between 17 and 30 mm and preferably between 22 and 27 mm. That is, for fittings 7 having similar shapes, the spacing between the surface 13 where the filling tool is indexed to the end of the piston 10 is increased for the valves for the reservoirs higher pressure (eg 300bar).

This distance L2 conditions the shape and dimensions of the filling tool 15 (see FIG. 7) to allow interaction between the filling tool 15 and the coupling 7 (see FIG.

As illustrated in the example of Figure 7, the filling tool comprises a body, one end of which forms a connecting head 16. The body of the tool 15 includes a circuit 17 for supplying fluid under pressure opening at the head 16 of connection. The connecting head 16 has dimensions and elements 18 conjugate coupling of the connector 7 of the valve (thread / tapping in this example).

A seal 19 is provided on the head 16 to bear on the reference surface 13 of the connector 7 so as to ensure a sealed connection between the filling tool 15 and the connector 7 (Figure 5). The tool 15 further comprises a push-piston shaft 20 projecting from the connecting head 16. The distance between the end end of the piston-pushing shaft 20 and the seal 19 is greater than or equal to the reference distance L2 of the connector 7, that is to say between 20 and 40 mm and preferably between 22 and 27mm.i

This configuration prevents effective connection (e.g. sealing) of the filling tool provided for high pressure to the connection of a valve provided for a relatively low pressure (without pressure reduction). See for example Figure 8 where sealing is not possible between the tool of Figure 6 or 7 and a connection of the type of Figure 1). The invention therefore makes it possible to equip batches of different bottles 44, 54 with taps 1 provided with separate filling connectors 7 (different reference distances L1, L2) as a function of the operating pressures and avoiding the risk of filling at a minimum. excessive pressure in some tanks and thus avoiding the risk of excessive pressure for the end user of the bottle).

Similarly, the invention makes it possible to avoid accidents when a high-pressure bottle (according to the configuration of FIG. 4) is brought to a filling ramp provided for bottles of lower pressure (according to the configuration of FIG. 1). In this case, the thrust shaft provided for the low pressure bottles would be too short and fail to open, even partially, the valve formed by the piston. Such partial opening can indeed cause accidents, especially for the case of oxygen.

As illustrated in FIGS. 4 and 5 in particular, the upstream end of the piston 10 preferably opens at a first end of a bore 14 formed in the body 1 and centered on the longitudinal axis A. The second end of said bore 14 opens at the bottom of the cavity defined by the connector 7. In the longitudinal direction A, said bore 14 preferably has a length of between 9 and 15 mm.

This bore 14 has for example a diameter of between 5 mm and 10 mm. The latter is thus adapted to the dimensions of the end 120 of the push valve 20.

Preferably and as shown in the figures, a portion of the cavity of the connector 7 comprises a frustoconical zone converging towards the bottom of the cavity (in the direction of the first end of the piston 10). The reference surface 13 is located at the frustoconical portion at a specific location.

For example, the reference surface 13 corresponds to the location of the connection (in the cavity in the example above) having a determined diameter intended to cooperate with a portion and of conjugated diameter of a filling tool (provided with 'a seal). For example, the reference surface 13 corresponds to the transverse plane intersecting the connection at which the cavity has a diameter of 14 mm. For example this reference surface corresponds to the location of the frustoconical portion has a diameter of 14mm. This abutment surface may also be defined by a shoulder, for example forming a surface perpendicular to the longitudinal axis A of the coupling, upstream or at the inlet of the frustoconical portion.

Thus, for the same reference surface (zone of the same diameter / dimension) of different connections, the reference distance L2 is larger (as described above) for the valves according to the invention (FIG. 4 or 5) than for the valves of the prior art (Figure 3).

Of course, this reference surface may be defined by a dimension other than a diameter of 14 mm. For example, the reference surface may correspond to where the fitting has a diameter of 10mm or 11mm or 13mm, or 16mm or 17mm or any other intermediate value. This reference surface may in particular depend on the standards that define, in each country or according to the applications, the dimensions of the connector and the tool that comes to connect tightly.

Claims (13)

1. A valve for a pressurized fluid reservoir comprising a body (1) provided with a first end (2) intended to be sealingly connected to an orifice of a reservoir (4) of fluid under pressure, the body (1) ) defining a fluid circuit (3) extending between a first end (5) for communicating with the interior of a reservoir (4) and a second end (6) opening at a connection (7) filling and possibly withdrawal, the connection (7) forming on the body (1) a cavity for receiving a filling tool and / or withdrawal, the circuit (3) of the valve comprising, a valve (8) d ' isolation and a pressure regulator (9), the pressure regulator (9) comprising a mechanism comprising a piston (10) movable in translation in a direction (A) longitudinal determined relative to a seat to ensure the opening or closing of circuit (3), the piston (10) being stressed té by a member (11) to return to the seat in a closed position of the circuit (3), an upstream end of the piston (10) opening at the bottom of the cavity defined by the connector (7) to allow mechanical actuation of the piston (10) by the end of an axis of a filling / withdrawal tool connected to the connector (7), the valve further comprising a safety mechanism (12) preventing the transit of gas from the second end ( 6) to the first end (5) of the circuit (3) by the single action of a fluid pressure exerted on the upstream end of the piston (10), i.e. the piston (10) must be moved mechanically by a tool to allow entry of pressurized fluid for filling, the cavity of the connector (7) defining a reference surface (13) for receiving a seal of a tool filling device connected to said coupling (7), in the closed position of the piston (10), the upstream end of the piston (10) being situated at a reference distance (L2) determined with respect to the reference surface (13) in the longitudinal direction (A), characterized in that the reference distance (L2) is between 17 and 30mm and preferably between 22 and 27mm. 2. Tap according to claim 1 characterized in that the upstream end of the piston (10) opens at the bottom of the cavity at an orifice forming the second end (6) of the circuit (3), said orifice having a diameter. between 7mm and 10mm. 3. Tap according to claim 1 or 2, characterized in that the upstream end of the piston (10) opens at a first end of a bore (14) formed in the body (1) and whose second end said bore (14) opens at the bottom of the cavity defined by the connector (7) and in that, in the direction (A) longitudinal, said bore (14) has a length of between 9 and 15 mm. 4. Tap according to claim 3, characterized in that the bore (14) has a diameter of between 7mm and 10mm. 5. Valve according to any one of claims 1 to 4, characterized in that the reference surface (13) is defined as being the location of the cavity having a determined diameter of between 10 and 17mm, in particular 14mm. 6. Valve according to any one of claims 1 to 5, characterized in that the mechanism (12) of safety comprises a non-return valve system ("NRV") which tends to move the piston (10) of the expander ( 9) pressure to its closed position when the latter is not actuated mechanically by a tool and is subjected to a fluid overpressure at its upstream end. 7. Tap according to any one of claims 1 to 6, characterized in that the mechanism (12) of safety comprises a valve (212) of pressure arranged to evacuate gas to the outside of the circuit (3) when the valve (212) is subjected to a pressure greater than a determined threshold. 8. Tap according to any one of claims 1 to 7, characterized in that a portion of the connector (7) defining the cavity is cylindrical and threaded or threaded. 9. Tap according to any one of claims 1 to 8, characterized in that a portion of the cavity of the connector (7) comprises a frustoconical zone converging towards the bottom of the cavity towards the first end of the piston and the reference surface (13) is located at the frustoconical portion. 10. Tank for pressurized fluid, particularly pressurized gas, provided with a tap, characterized in that the valve is in accordance with any one of claims 1 to 9. 11. An assembly comprising a plurality of tanks (4) for storing pressurized fluid comprising a first group (44) of tanks (s) for storing fluid under pressure at a first maximum operating pressure of between 150 bar and 240 bar , in particular 200bar, the assembly comprising a second group (54) of tanks (s) for storing fluid under pressure at a second maximum operating pressure, for example between 250 bar and 700 bar, in particular 300 bar, each reservoir of assembly being provided with a valve comprising a body (1) provided with a first end (2) sealingly connected to an orifice of a reservoir (4) of fluid under pressure, the body (1) of each valve defining a fluid circuit (3) extending between a first end (5) communicating with the interior of the reservoir (4) and a second end (6) opening at a filling connection (7) and drawing, the connection (7) forming on the body (1) a cavity for receiving a filling and / or withdrawal tool, the valve circuit (3) comprising an isolation valve (8) and a mechanism comprising a piston (10) movable in translation in a direction (A) longitudinal determined to ensure the opening or closing of the circuit (3), the piston (10) being biased by a member (11) to return to a seat in a closing position of the circuit (3), an upstream end of the piston (10) opening at the bottom of the cavity delimited by the connector (7) to allow the mechanical actuation of the piston (10) by an axis of a filling / withdrawal tool connected to the connector (7), the valve further comprising a safety mechanism (12) preventing the gas flow from the second end (6) to the first end (5) of the circuit (3) by the 'sole action of a fluid pressure exerted on the upstream end of the udder tone (10), i.e. the piston (10) is to be mechanically moved by a tool to allow entry of pressurized fluid for filling, the cavity of the connector (7) defining a reference surface (13) for receiving a seal of a filling tool connected to said fitting (7), in the closed position of the piston (10), the upstream end of the piston (10) being located at a reference distance (L1, L2) determined with respect to the reference surface (13) in the longitudinal direction (A), characterized in that the reference distance (L1) for the first reservoir group (s) is between 10mm and 17mm and in that the valve of the tanks of the second group comprises a pressure regulator (9), the piston (10) movable in translation in a direction (A) forming part of the mechanism of the pressure regulator and in that the reference distance (L2) for the second group of reserv boir (s) is between 20 and 30mm and preferably between 22 and 27mm, that is to say that each valve of the second group is in accordance with any one of claims 1 to 9. 12Fuel refilling device according to claim 10 or a reservoir of the second group (54) of reservoirs of the reservoir assembly of claim 11, comprising a body comprising an end provided with a head (16) connection piece, the body of the tool (15) integrating a circuit (17) supplying pressurized fluid opening at the head (16) of connection, the connection head comprising dimensions and organs (18) of conjugate hooking of the faucet connector (7), a seal (19) for sealing against the reference surface (13) of the connector (7) to ensure a tight connection between the filling tool (15) and the coupling (7), the tool further comprising a pusher pin (20) protruding from the connecting head, characterized in that the distance between the end end of the pin (20) -piston and the seal (19) is equal to the distance of r ference (L2) of the connector (7) that is to say is between 20 and 30mm and preferably between 22 and 27mm. 13.0filler according to claim 12, characterized in that the end end of the shaft (20) pusher piston has a diameter between 5mm and 9mm.