EP2780624B1 - Gas bottle valve provided with a flywheel controlling a residual-pressure valve and a stop valve - Google Patents

Description

Technical area

The invention relates to a valve, in particular for a gas cylinder, more particularly to a valve, in particular for a gas cylinder equipped with a residual pressure maintenance function.

Prior art

Gas cylinder valves are currently commonly equipped with a residual pressure holding device. The residual pressure is typically of the order of a few bars (such as 3 bars or 44 psi). This device prevents the penetration of impurities by possible reflux in the bottles in use, or by contact with the atmosphere in unconnected bottles and whose valve and remained open.

This type of device usually consists of a calibrated valve arranged upstream of the valve valve. This valve is arranged so that elastic means exert a closing force, the valve being configured so that the high pressure present in the bottle pushes easily the valve so as to open when there is a request for debit. When the flow is stopped, the valve closes, preventing any backflow. When the bottle is almost empty to the point that the pressure within it is lower than the calibration pressure necessary to open the valve, no gas can be withdrawn. The valve remains permanently closed, the contents of the bottle remains isolated from the outside even when the tap valve is open.

When filling the gas cylinder via the tap, the residual pressure valve, by its construction, will naturally remain closed. It is then necessary to force its opening to allow the filling of the bottle.

The patent document US 5,048,565 discloses a gas cylinder valve provided with a closing valve, a residual pressure valve and a safety valve. The residual pressure valve can be controlled in the open position for filling via a device pneumatically or mechanically controlled opening (eg via a lever or an external tool).

The patent document EP 0 372 279 A1 discloses a residual pressure valve which can be put in the open position by rotation of a control member in a quarter of a turn. The valve and the control member are equipped with a cam device for converting the rotational movement of the control member into a translation movement of the valve.

The control opening a residual pressure valve as disclosed in the two documents mentioned above is in principle reserved for qualified personnel for filling bottles. It is indeed important that the valve can not be opened outside the filling operations. The opening of the valve requires a particular procedure such as an auxiliary compressed air connection or such as the intervention of particular tools.

The patent document US 3,820,560 discloses a diving cylinder valve comprising a residual pressure valve equipped with a control lever. The latter acts in rotation on an axis provided with cam profiles acting on a corresponding part acting itself on the moving part of the residual pressure valve. Actuation of the lever makes it possible to force the valve in the open position. It should be noted that the valve has a movable seat that allows the filling of the bottle without having to open the valve by means of the lever. The lever allows easy opening of the valve but no security is provided to prevent opening of the valve when the bottle is in use. The tap of this teaching is indeed intended to provide a supply of oxygen during scuba diving. The operation of the lever is intended to give access to this reserve.

The patent document EP 0 708 281 A1 discloses a valve with a rotary control member and a residual pressure holding device adapted to be held in the open position by the rotary control member. To do this, the residual pressure maintenance device comprises a shutter mounted to slide and coupled to a rod of animated control in rotation and translation by the rotary control member.

The patent document FR 2 657 668 A1 discloses a valve according to the preamble of claim 1. The thread of the rotary control member of the valve is treated as a control track. The control member in question then participates in the forced opening of the residual pressure maintenance device. The insertion of an external tubing into the outlet orifice is, however, necessary to complete the operation of forced opening of the residual pressure holding device for filling a bottle on which the valve is mounted.

The patent document FR 2,244,123 discloses a gas cylinder valve comprising a closure valve and a purge valve of the valve outlet and the pipe connected thereto. These two valves are controlled by a rotary control member comprises at least one control track.

Summary of the invention Technical problem

The technical problem to be solved by the invention consists in proposing a valve for a gas cylinder equipped with a device for maintaining residual pressure and whose filling operation is facilitated.

Technical solution

The invention relates to a valve for gas under pressure, in particular for a gas cylinder, comprising: a body with an inlet, an outlet and a passage connecting the inlet with the outlet; a device for maintaining a residual pressure at the inlet when the valve is in use, the device being arranged in the passage between the inlet and the outlet; a rotational control member disposed on the body configured to control the forced opening of the residual pressure holding device so as to deactivate it; an auxiliary device separate from the residual pressure maintaining device; the rotary control member comprising at least one control track configured so that the rotation of the control member can control the residual pressure maintaining device and the auxiliary device; and a first control rod of the residual pressure maintaining device cooperating with the track or one of the tracks of the rotary control member; remarkable in that it further comprises a second control rod of the auxiliary device cooperating with the track or one of the tracks of the rotary control member, the second rod being disposed at least substantially parallel to the first rod.

The residual pressure maintaining device is active when it performs its function of maintaining residual pressure. In service flow, it is open. When there is no flow but sufficient pressure in the bottle, it can be either open or closed, depending on its construction. It is inactive when it is in the forced open position.

The valve can be dimensioned for gases under a pressure of more than 50 bar, more particularly more than 100 bar.

According to an advantageous embodiment of the invention, the rotary control member has a general disc shape, and is preferably disposed outside the body.

The rotary control member may be of plastics material. The body and / or the rotary control member may comprise indexing means.

The body and / or the rotary control member may comprise locking means to a particular position such as the filling position.

According to another advantageous embodiment of the invention, the body comprises a circular groove on which the rotary control member is clipped.

According to yet another advantageous embodiment of the invention, the auxiliary device is a closure device of the passage, preferably disposed downstream of the residual pressure maintenance device.

According to yet another advantageous embodiment of the invention, the rotary control member comprises a first filling position of the bottle where the residual pressure maintaining device is in the forced opening position (that is to say is deactivated). , and preferably the closing device, is open; a second closing position of the bottle where the residual pressure maintaining device is active and the closing device is closed; a third service position where the residual pressure maintaining device is active and the closing device is open; the first, second and third positions being preferably consecutive with respect to the rotation of the rotary control member.

According to yet another advantageous embodiment of the invention, the rotary control member comprises a first track intended to control the residual pressure maintenance device and a second track intended to control the auxiliary device, the first track and / or the second track. track preferably having recesses corresponding to stop positions and configured to generate at the rotary control member a feeling of said stop positions.

According to yet another advantageous embodiment of the invention, the residual pressure holding device and the auxiliary device each comprise an element that is able to move in translation in at least substantially parallel directions, the control member being rotatable about a axis of rotation at least substantially parallel to these directions.

According to yet another advantageous embodiment of the invention, the valve body comprises a gas inlet connection with a main axis, and a longitudinal axis generally parallel to the main axis of said coupling, the translation directions of the moving elements of the residual pressure holding device and the auxiliary device being at least substantially perpendicular to said longitudinal axis.

Advantageously, the first and the second rod are disposed on either side of an axis of rotation of the rotary control member.

According to yet another advantageous embodiment of the invention, the auxiliary device comprises a shutter cooperating with a seat and normally brought into contact with said seat by elastic means in a direction corresponding to that of the gas when the valve is in use, the second control rod being configured to move the shutter in a direction opposite to the direction of the force exerted by the elastic means.

According to yet another advantageous embodiment of the invention, the first and / or the second control rod comprises / each comprise an abutment limiting their movement in the direction opposite to that of control.

According to yet another advantageous embodiment of the invention, the first and / or second control rod comprises / each comprise a contact portion with the one or more control tracks of the rotary control member, the one or more contact portions normally exceeding the body.

According to yet another advantageous embodiment of the invention, the residual pressure maintaining device comprises a shutter cooperating with a preferably fixed seat, and normally brought into contact with said seat by elastic means in a direction corresponding to that of the gas when the faucet is in use.

According to yet another advantageous embodiment of the invention, the shutter comprises a first portion cooperating with the seat and having a first section, and a second portion of a second section greater than the first section, the first and second portions delimiting with the body a first high pressure chamber in contact with the inlet of the valve, the second portion comprising sealing means cooperating with a corresponding surface.

According to yet another advantageous embodiment of the invention, the second portion of the shutter defines with the body a second chamber in contact with the passage of the body downstream of the first portion and the seat via a shutter channel.

Benefits brought

The measures of the invention have the advantage of ensuring control of the residual pressure maintenance device coordinated with an auxiliary device such as a valve closing / opening the valve. In this way, the residual pressure maintaining device can remain normally closed during normal operation of the tap (it being understood that the residual pressure maintaining device opens automatically when there is a demand for gas flow) . In addition, the construction is particularly simple and easy to implement.

Brief description of the drawings

• The figure 1 is a plan view of a valve for a gas cylinder, according to the invention.
• The figure 2 is a sectional view of the faucet of the figure 1 along the axis 2-2.
• The figure 3 is a longitudinal sectional view of the valve of the figure 1 .
• The figure 4 is an isometric view of the faucet flywheel Figures 1 to 3 .

Description of the embodiments

The figure 1 illustrates a valve for a gas cylinder, according to the invention. The valve 2 comprises a body 4, preferably generally solid. The body 4 comprises a connection connection 6 to a gas cylinder (not shown). This connection is in the form of conical male thread and corresponds to an inlet 7 of the tap. The body 4 also comprises a gas outlet 9. The valve is provided with a flywheel 8 disposed laterally on the body 4. This flywheel 8 is a control wheel of a residual pressure maintenance device and a valve of the tap.

The figure 2 which is a sectional view along the axis 2-2 of the figure 1 , illustrates the interior of the top of the faucet. As can be seen in figure 2 , the body encloses a valve 14 for closing the passage 10 connecting the gas inlet ( figure 1 , reference 7) with exit 9. The body comprises a chamber 22 connected with the entry 7 ( figure 1 ) via a residual pressure holding device ( figure 3 , reference 38). The chamber contains a shutter 16 held in pressure against a seat 18 by a spring 20. The spring 20 bears on the bottom of the chamber 22. The seat 18 consists of a pellet with a central hole, made of material suitable for ensure sealing with the shutter 16. The latter may be of metal material and the seat may be of plastic material such as for example nylon. The seat 18 is sandwiched between a shoulder formed in the body 4 of the valve and a seat support 26 held in pressure against the shoulder by a clamping piece 30 screwed into a cavity of the body 4. A seal 28 as well as optionally an anti-extrusion ring are provided between the seat support 26 and its housing in the body 4. This is a static seal since the seat support 26 is stationary. The seat support 26 includes a central bore extending along its main axis. This bore accommodates a control rod 12 of the shutter 16 of the valve 14. The control rod 12 comprises a groove with a seal 24 and optionally an anti-extrusion ring so as to seal with the bore of the seat support 26 in which she is lodged. The seal is dynamic because the control rod is able to move in translation along its main axis. It also comprises a shoulder intended to bear against a corresponding shoulder of the clamping piece 30. A first end (to the left following the figure 2 ) is in front of the shutter 16 and a second end (on the right following the figure 2 ) leaves the body 4 of the valve and cooperates with a profiled surface of the wheel 8.

The valve 14 is configured so that the shutter 16 is disposed on the upstream side of the seat 18 and the spring 20 normally holds it in pressure against the seat 18. In this way, the valve closes naturally and the pressure of the bottle also exerts pressure on the shutter 16 directed towards the seat 18. As will be explained in more detail in connection with the Figures 3 and 4 , the rotation of the wheel 8 to open the valve 14 will move the control rod 12 to the shutter 16 so as to move it away from its seat 18 and allow the passage of gas from the chamber 22 to the outlet 9. In closed position of the valve, corresponding to that illustrated in figure 2 , the control rod 12 is not pressurized between the profiled surface of the wheel 8 and the front face of the shutter 16, so as to ensure a satisfactory seal and to allow a matting or tamping of the seat in function the pressure exerted and according to the number of cycles and / or the age of the tap. In other words, in the closed position of the valve 14, the control rod 12 has at least one of its ends at a distance from its respective contact surface according to a suitable mechanical clearance.

The figure 3 which is a longitudinal sectional view of the faucet of the figure 1 , illustrates well the interior of the faucet. The passage 10 made in the body 4 connects the inlet 7 to the outlet (not visible in this figure but on the figure 2 , reference 9). The passage opening towards the top of the valve body is in direct communication with the chamber containing the valve 14. It may be intended to be connected to a manometer. It should be noted that the faucet shown in Figures 1 to 3 is incomplete at the top.

The body 4 encloses a device for maintaining residual pressure 38 in the bottle. The latter is disposed at the passage 10 connecting the inlet 7 to the valve outlet, upstream of the valve 14. It essentially comprises a shutter 43 cooperating with a seat 41, similarly to the valve 14, but with the important difference that the shutter defines a first chamber 39 with variable volume upstream of the seat 41. The shutter 43 in fact comprises a first portion 44 cooperating with the seat 41 of the body 4 of the valve, and a second portion 42 sealingly sliding with a body wall 4. This wall may be formed by a piece 40 attached in a bore of the body, as illustrated in FIG. figure 3 . The second portion 43 has a section greater than that of the first portion 44, which allows the application of the pressure from the bottle to generate a resultant force on the shutter 43 facing the second portion. This force is opposed to the force of the spring or springs 46 arranged between the screwed piece 40 and the face of the shutter 43 corresponding to the second portion. The elastic force of the springs 46 and the difference in section between the second and first portions are dimensioned so as to allow a displacement of the shutter and, therefore, the opening of the gas passage from a given pressure. This minimum pressure for the opening of the residual pressure maintaining device may be of the order of a few bars, such as 3 bars. This pressure corresponds to the residual pressure that will be in the bottle when the contents of the latter have been consumed and that it will no longer deliver gas.

A channel 45 formed in the shutter 43 connects a second chamber 47 with the gas passage 10 directly downstream of the shutter 43. The second chamber 47 is defined by the housing of the shutter 43 and its rear face corresponding to its second portion 42. If one tries to fill the bottle without first opening the residual pressure maintaining device, the filling pressure will be established in the chamber 47 which has an effective section corresponding to the second portion of the shutter , this section being greater than that of the first portion. This then results in a force on the shutter directed in the closing direction of the latter.

A control rod 36 is partially disposed in the gas passage 10 directly downstream of the seat 41 and the shutter 43 of the residual pressure holding device 38. This control rod is similar to the control rod 12 of the valve 14. It is slidably mounted in a bore of the body 4, parallel to the control rod 12. It also has a shoulder intended to cooperate with a corresponding shoulder of the body 4, so as to limit its movement in the closing direction of the device residual pressure maintenance 38. A spring is also provided to assist the movement of the rod 36 towards the flywheel 8. Sealing means such as a seal possibly accompanied by an anti-extrusion ring, are provided in a groove of the control rod 36, so as to seal with the bore of the body 4. A first end of the control rod is vis-à-vis the first portion 44 of the shutter 43 and a second end is in contact with a profile surface of the flywheel 8. Similar to the valve 14, the control rod is sized to be able to work properly the device for maintaining residual pressure, and this despite any matting of the contact surfaces between the seat 41 and the shutter 43. To do this, a mechanical clearance is provided between the first end (the one on the left following the figure 3 ) of the control rod 36 and the shutter 43 when the steering wheel is in a position not acting on the residual pressure maintenance device. The mechanical clearance may be between 0.1 mm and 2 mm, preferably between 0.1 and 1 mm, more preferably between 0.1 and 0.5 mm.

As can be seen in figure 4 illustrating the flywheel 8 in perspective, the latter comprises a disc-shaped main part and a skirt formed by a series of sections 32 and 48, some of which 48 are provided with a hook-shaped part intended to cooperate with a groove 34 ( figure 3 ) formed on the body 2.

The inner face of the disk-shaped portion of the flywheel 8 comprises two tracks. A first track 50 is intended to cooperate with the control rod 36 of the residual pressure maintenance device. It comprises a sliding surface for the corresponding end of the control rod, this sliding surface having a profile inclined so as to move the control rod during the rotation of the flywheel 8. The first track 50 comprises two recesses or points rest for the corresponding end of the control rod.

A first hollow 52 corresponds to a first position of the control rod where it does not control the residual pressure maintenance device. This first hollow corresponds to a portion of the track where its profile is the lowest or remote from the body of the valve. A second hollow 54 corresponds to a second position of the control rod where it forces the opening of the residual pressure maintenance device. The second hollow corresponds to a portion of the track where its profile is the highest or closest to the body of the valve.

The first track also includes a clearance zone 56 extending the track from the first depression 52. This clearance zone is designed not to move the corresponding control rod.

A second track 58 is intended to cooperate with the control rod 12 of the valve 14. Similarly to the first track, the second track comprises a sliding surface for the corresponding end of the control rod, this sliding surface having a inclined profile so as to move the control rod during the rotation of the wheel 8. It comprises three recesses or rest points for the corresponding end of the control rod. A first hollow 64 disposed at a central portion of the track forming a lower portion of the track. The first depression corresponds to a position of the steering wheel where the valve is not controlled, that is to say is normally closed. A second recess 60 and a third recess 62 are arranged, respectively, at the ends of the track 58. These ends correspond to high or near portions of the valve body. The second and third hollows correspond to positions of the steering wheel where the valve is actuated, that is to say is put in the open state.

The first recess 52 of the first track 50 and the first recess 64 of the second track correspond to a closed position of the valve, that is to say a position where the valve and the residual pressure maintaining device are normally closed. . In the specific case of the illustrations of Figures 1 to 4 the control rods 12 and 36 are diametrically opposed to the center of rotation of the flywheel 8, so that the first recesses 52 and 64 of the first and second tracks are also diametrically opposed.

The second recess 54 of the first track 50 and the third recess 62 of the second track 58 correspond to a filling position of the bottle. Indeed, the second recess 54 of the first track 50 makes it possible to force the opening of the residual pressure holding device and the third recess 62 of the second track 58 ensures the opening of the valve 14. It should be noted that the The opening of the valve 14 is in principle not necessary because of its construction in the form of a valve which can open naturally under the filling pressure. As can be seen in figures 2 and 3 , the closing spring 20 of the shutter 16 of the valve 14 is powerful enough in particular to ensure a level of safety and sealing satisfactory for the faucet. The pressure and, consequently, the flow rate resulting from the gas at the outlet of the valve during filling could be greatly reduced when the valve 14 passes in the absence of forced opening thereof. This is the reason why an opening of the valve 14 is provided during the filling of the bottle.

The second recess 60 of the second track 58 and the clearance zone 56 of the first track 50 correspond to a service position of the valve. Indeed, the second recess 60 provides a displacement of the control rod of the valve forcing its opening while the clearance zone 56 of the first track 50 ensures undisturbed operation of the residual pressure maintenance device.

The first and second tracks are concentric and describe, each, about a semicircle. In the specific case described in connection with the figures, the two tracks have essentially the same radius. However, they could have different radii. In this case, the tracks could describe more than one semicircle. The positioning of the control rods of the valve and the residual pressure holding device on either side of the center of rotation of the steering wheel allows a balancing of the pressures exerted by the rods on the steering wheel. However, it is conceivable to provide that the control rods are arranged in a sector less than 180 °, more precisely 90 °, or even aligned on a spoke.

It should also be noted that the presence of hollows on the steering wheel or tracks is not mandatory. It allows to ensure rest positions with a feeling at the manual steering wheel. It is also possible to provide separate indexing means for the steering wheel and one or more continuous tracks without abrupt variation of the profile at the rest points.

• une première position de remplissage de la bouteille où le dispositif de maintien de pression résiduelle est désactivé, c'est-à-dire en position ouverte forcée, et la vanne est ouverte ;
• une deuxième position de fermeture de la bouteille où le dispositif de maintien de pression résiduelle est actif et la vanne est fermée ;
• une troisième position de service où le dispositif de maintien de pression résiduelle est actif et la vanne est ouverte ; le dispositif de maintien de pression résiduelle s'ouvrant en présence d'une pression suffisante dans la bouteille.

The steering wheel therefore has three positions:

• a first filling position of the bottle where the residual pressure maintaining device is deactivated, that is to say in forced open position, and the valve is open;
• a second closed position of the bottle where the residual pressure maintaining device is active and the valve is closed;
• a third service position where the residual pressure maintaining device is active and the valve is open; the residual pressure maintaining device opening in the presence of a sufficient pressure in the bottle.

The first, second and third positions are consecutive with respect to the rotation of the rotary control member.

It should be noted that the valve of the invention is not exclusively intended to be mounted on a gas cylinder. It can in particular be mounted on bodies or pipes of gas under pressure.

List of reference signs

• 2: faucet
• 4: body
• 6: inlet connection for bottle
• 7: gas inlet
• 8: flying
• 9: gas outlet
• 10: gas passage
• 12: (second) valve control rod
• 14: valve
• 16: Valve shutter
• 18: seat
• 20: valve spring
• 22: valve chamber
• 24: seal of the first control rod
• 26: seat support
• 28: seal
• 30: clamping piece of the joint support
• 32: skirt of the steering wheel
• 34: throat of the body
• 36: (first) control rod of the residual pressure maintaining device
• 38: residual pressure maintenance device
• 39: first chamber of the residual pressure maintaining device
• 40: screwed part of the flap
• 41: seat of residual pressure maintenance device
• 42: second portion of the shutter of the residual pressure maintaining device
• 43: shutter of the residual pressure maintaining device
• 44: first portion of the shutter of the residual pressure holding device
• 45: shutter channel of the residual pressure holding device
• 46: spring
• 47: second chamber of the residual pressure maintaining device
• 48: steering wheel hook skirt
• 50: (first) track of the residual pressure maintaining device
• 52: first depression of stop of the first track, in normally closed position of the device for maintaining residual pressure
• 54: second stop of the first track, in the open position of the residual pressure maintaining device
• 56: clearance area of the first runway
• 58: (second) valve track
• 60: second stop pit of the second track, corresponding to an open position of the valve
• 62: third stop of the second runway, corresponding to an open position of the valve
• 64: first stop pit of the second track, corresponding to a closed position of the valve

Claims (14)

1. Tap (2) for pressurized gas, especially for gas cylinder, comprising:

   - a body (4) with an inlet (7), an outlet (9) and a passageway (10) connecting the inlet to the outlet;

   - a device for maintaining a residual pressure (38) at the inlet when the tap is in service, the device (38) being disposed in the passage (10) between the inlet (7) and the outlet (9);

   - a rotatable actuator (8) disposed on the body (4), configured to control the forced opening of the residual pressure device (38) in order to deactivate said device;

   - an auxiliary device (14) distinct from the residual pressure device (38);

   the rotatable actuator (8) comprising at least one track (50, 58) configured so that the rotation of the actuator (8) can control the residual pressure device (38) and the auxiliary device (14); and

   - a first control rod (36) of the residual pressure device (38), cooperating with the track or one of the tracks (50) of the rotatable actuator (8); and

   characterized in that the tap comprises:

   - a second control rod (12) of the auxiliary device (14), cooperating with the track or one of the tracks (58) of the rotatable actuator (8), the second rod (12) being disposed at least substantially parallel to the first rod (36).
2. Tap (2) according to Claim 1, characterized in that the rotatable actuator (8) is generally disc-shaped, and is preferably disposed outside the body (4).
3. Tap (2) according to claim 2, characterized in that the body (4) comprises a circular groove (34) on which the rotatable actuator (8) is clipped.
4. Tap (2) according to one of claims 1 to 3, characterized in that the auxiliary device (14) is a device for shutting-off the passage (10), preferably disposed downstream of the residual pressure device (38).
5. Tap (2) according to claim 4, characterized in that the rotatable actuator (8) comprises:

   - a first position for filling the cylinder where the residual pressure device (38) is forced in an open position, and preferably the shutting-off device (14) is open;

   - a second position for shutting-off the cylinder where the residual pressure device (38) is active and the shutting-off device (14) is closed;

   - a third position of service where the residual pressure device (38) is active and the shutting-off device (14) is open;

   the first, second and third positions being preferably consecutive relative to the rotation of the rotatable actuator (8).
6. Tap (2) according to one of claims 1 to 5, characterized in that the rotatable actuator (8) comprises a first track (50) for controlling the residual pressure device (38) and a second track (58) for controlling the auxiliary device (14), the first track (50) and/or the second track (58) preferably having recesses (52, 54, 60, 62, 64) corresponding to stop positions and configured to generate at the level of the rotatable actuator (8) felt stop positions.
7. Tap (2) according to one of claims 1 to 6, characterized in that the residual pressure device (38) and the auxiliary device (14) each comprise an element movable (43, 16) in translation in directions at least substantially parallel, the rotatable actuator (8) being rotatable about an axis of rotation at least substantially parallel to these directions.
8. Tap (2) according to claim 7, characterized in that the body (4) comprises a gas inlet fitting (6) with a main axis, and a longitudinal axis generally parallel with the main axis of said fitting, the directions of translation of the movable elements (43, 16) of the residual pressure device (38) and of the auxiliary device (14) being at least substantially perpendicular to said longitudinal axis.
9. Tap (2) according to one of claims 1 to 8, characterized in that the auxiliary device (14) comprises a shutter (16) cooperating with a seat (18) and normally in contact with said seat by elastic means (20) in a direction corresponding to that of gas when the tap is in service, the second control rod (12) being configured to move the shutter (16) in a direction opposite to the direction of the force exerted by the elastic means (20).
10. Tap (2) according to one of claims 1 to 9, characterized in that the first and/or the second control rod (36, 12) comprise(s), each, an abutment limiting its movement in the opposite direction to the control direction.
11. Tap (2) according to one of claims 1 to 10, characterized in that the first and/or the second control rod (36, 12) comprise(s), each, a contact portion with the or one of the tracks (50, 58) of the rotatable actuator (8), the contact portion(s) projecting normally from the body (4).
12. Tap (2) according to one of claims 1 to 11, characterized in that the residual pressure device (38) comprises a shutter (43) cooperating with a seat (41) that is preferably fixed, and normally placed in contact with said seat (41) by elastic means (46) in a direction corresponding that of the gas when the tap is in service.
13. Tap (2) according to claim 12, characterized in that the shutter (43) comprises a first portion (44) cooperating with the seat (41) and having a first section and a second portion (42) of a second section that is greater than the first section, the first and second portions (44, 42) defining with the body (4) a first high pressure chamber in contact with the tap inlet (7), the second portion (42) including sealing means cooperating with a corresponding surface.
14. Tap (2) according to claim 13, characterized in that the second portion (42) of the shutter (43) with the body (4) defines with the body (4) a second chamber (47) in contact with the passage (10) of the body (4) downstream of the first portion (44) and the seat (41) via a channel (45) of the shutter (43).

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