Improved throttle control

Abstract

Regulator (10) for a gas control device, and in particular of a type suitable for installation in a gas transmission and / or distribution network, comprising a structure (11) with a gas inlet (31) and a gas outlet (32), wherein: - the regulator (10) comprises at least one control stage configured to reduce the gas pressure passing from the inlet (31) to the outlet (32) when passing through a through-opening (14), the control stage comprising a closure (15) movable to close and / or block the through-opening (14), - the regulator (10) comprises a control head (16) for the controlled movement of the shutter (15) of the control stage, the control head (16) comprising a movable group (38) mechanically connected to the shutter (15) for the controlled movement of the shutter (15), - the control head (16) is configured so that the movable group (38) is acted upon in opposite directions by thrust means (70) and pressurized gas Pu corresponding to the pressure of the gas emerging from the regulator (10) or after the regulator itself, and characterized in that the movable group (38) of the control head (16) of the shutter (15) of the control stage comprises: - a first movable separating element (90) having a first side (91) on which compressed gas Pu acts directly, - a second movable separating element (92) positioned on or facing a second side (93) of the first movable separating element (90) opposite the first side (91) of the first movable separating element (90) on which the compressed gas Pu acts.

Description

FIELD OF EXPERTISE

[0001] The present innovation relates to a regulator to be used in a device for regulating gas pressure, and in particular of a type suitable for use and installation in installations and / or networks for the transmission and / or distribution of gas, such as natural gas and / or decentralised gases, such as biomethane and / or hydrogen. STATE OF THE ART

[0002] As is known, pressure control stations are provided in gas transmission and / or distribution networks to reduce the gas pressure from the inlet value to the value required by the consumer and to keep it stable at the specified value even in the event of changes in the upstream pressure or changes in the flow required by the consumer.

[0003] In particular, the above-mentioned pressure reduction is achieved by pressure regulators configured so that the output pressure corresponds to a preset calibration value regardless of the gas quantity supplied.

[0004] A pressure regulator of known type comprises a gas passage line, the upstream end of which communicates with the high-pressure branch of the transmission and / or distribution network, and the opposite downstream end of which communicates with the low-pressure branch directed towards the consumer.

[0005] A closure is provided in the gas passage line, which creates a restriction in the passage section of the line itself, thus reducing the gas pressure between upstream and downstream of the closure itself. Specifically, the pressure reduction occurs by lamination of the gas at the passage section affected by the closure.

[0006] Advantageously, the closure is movable so that the passage section and thus the pressure drop of the gas can be changed depending on the flow of the gas itself.

[0007] The movement of the shutter is controlled by a feedback system which, if the pressure of the downstream gas (i.e. the gas downstream of the regulator) increases compared to the calibration value, reduces the degree of opening of the shutter itself; the opposite occurs in the event of a pressure reduction.

[0008] Depending on the type of control intended, direct-acting pressure control devices and pilot-operated pressure control devices / equipment are provided.

[0009] In particular, direct-acting regulators provide a single regulator whose degree of opening of the shutter—and in particular the degree of opening of the gas passage section—is controlled by a control head comprising a chamber housing a movable diaphragm connected to the shutter and dividing the chamber into two sub-chambers. In particular, the movable diaphragm is acted upon by the thrust generated by the calibration spring and also by the gas at the outlet pressure, since one of the two sub-chambers of the control head is fluidly connected to receive the gas at the outlet pressure.

[0010] Currently, industry legislation – for example, German legislation – requires that in the event of damage to the movable diaphragm of the control head, the gas is released into the atmosphere in a controlled manner.

[0011] For this purpose, known solutions involve the use of an additional / second diaphragm, particularly thick and therefore bulky, also housed in the engine chamber. This allows it to receive the gas thrust in the event of damage to the first diaphragm (i.e., the main diaphragm) and rest on the upper cover that defines the chamber itself. These known solutions are not particularly satisfactory, as the regulation is less precise and they also prove uneconomical in terms of production costs. GOALS OF INNOVATION

[0012] One purpose of the innovation is to propose a gas regulator, in particular a regulator of the type intended to be installed in a device for regulating gas pressure in a gas transmission and / or distribution network, which makes it possible to overcome, in whole or in part, the disadvantages of the known solutions.

[0013] Another purpose of the innovation is to propose a regulator that, in case of damage to the control diaphragm, limits the leakage or in any case discharges the gas to the outside of the regulator in a controlled manner, while preventing mechanical damage to the regulator itself.

[0014] Another purpose of the innovation is to propose a regulator that is simultaneously safe, precise and particularly economical to manufacture.

[0015] Another purpose of the innovation is to propose a regulator with a safety diaphragm that can withstand the maximum design pressure in case of rupture of the main regulating diaphragm.

[0016] Another purpose of the innovation is to propose a controller that is simple, fast and inexpensive to obtain.

[0017] Another purpose of the innovation is to propose a regulator that complies with the regulations in force in the industry.

[0018] Another purpose of the innovation is to propose a regulator that allows precise control of the pressure of the gas flowing through it.

[0019] Another purpose of the innovation is to propose a regulator that is very safe and reliable.

[0020] Another purpose of the innovation is to propose a solution that can be installed and used in controllers of different types.

[0021] Another purpose of the innovation is to propose a solution that can be installed and used in existing controllers and, in particular, is already commercially available and / or already installed on site.

[0022] Another purpose of the innovation is to propose a solution that can be installed and assembled easily, quickly and cost-effectively.

[0023] Another purpose of the innovation is to propose a controller that is particularly durable, robust and less susceptible to wear.

[0024] Another purpose of the innovation is to propose a controller with a small footprint, thus facilitating installation.

[0025] Another purpose of the innovation is to propose a controller that is easy and quick to maintain and cost-effective.

[0026] Another purpose of the innovation is to propose a controller that is simple, fast and inexpensive to obtain.

[0027] Another purpose of the innovation is to propose a controller whose size is smaller and therefore more compact than the known solutions.

[0028] Another purpose of innovation is to propose a regulator that is better and / or alternative to the traditional ones.

[0029] Another purpose of the innovation is to propose a controller that has an alternative characterization compared to conventional controllers, both in terms of design and functionality. INNOVATION OVERVIEW

[0030] All purposes mentioned here, both individually and in any combination, and others which result from the following description, are achieved in accordance with the invention with a controller according to claim 1. FIGURE DESCRIPTION

[0031] The present innovation is further explained below in some of its preferred embodiments, which are given only by way of example and not by way of limitation with reference to the attached drawing tables, where: Fig. 1 shows a perspective view of the regulator according to the innovation, Fig. 2 shows it in a different perspective view, Fig. 3 shows a perspective view of a section of the regulator of Fig. 1, which is obtained according to a plane passing through the shutter shaft along its direction of movement and also through the center of the gas inlet and outlet, Fig. Figure 4 shows in perspective a section of the regulator obtained according to a plane passing through the shutter shaft along its direction of movement and perpendicular to the section plane of the Fig. 3 stands, Fig. 5 shows the exploded view of the section of Fig. 3, Fig. Figure 6 shows an exploded perspective view of the section of Fig. 3, Fig. 7 shows a section of the controller of Fig. 1 - according to a plane passing through the shutter shaft along its direction of movement and also through the center of the gas inlet and outlet - with the shutter fully open and in a state where the first diaphragm is not damaged, Fig. Figure 7A shows an enlarged detail of Fig. 7, Fig. 8 shows the controller of Fig. 7 with the shutter fully open and in a condition where the first membrane is damaged, Fig. Figure 9 shows a section - along a plane passing through the shutter shaft along its direction of movement and also through the center of the gas inlet and outlet - of a regulator according to the innovation in a second embodiment, wherein the shutter is fully open and in a state in which the first membrane is not damaged, Fig. Figure 10 shows a section - along a plane passing through the shutter shaft along its direction of movement and also through the center of the gas inlet and outlet - of a regulator according to the innovation in a third embodiment, with the shutter fully open and in a state in which the first membrane is not damaged, Fig. Figure 10A shows an enlarged detail of Fig. 10, Fig. Figure 11 shows a section - along a plane passing through the shutter shaft along its direction of movement and also through the center of the gas inlet and outlet - of a regulator according to the innovation in a fourth embodiment, with the shutter fully open and in a state in which the first membrane is not damaged. DETAILED DESCRIPTION OF THE INNOVATION AND SOME OF ITS PREFERRED EMBODIMENTS

[0032] As can be seen from the figures, the present innovation relates to a regulator 10 for a gas control device and in particular of a type suitable for installation in a gas transmission and / or distribution network, more preferably in a medium and low pressure gas distribution network.

[0033] The controller 10 is preferably suitable for use in the domestic sector, but could also be used in the industrial sector.

[0034] In particular, the control device may be a conventional device (direct or pilot operated) configured to reduce the pressure of the gas flowing through it and, in particular, is suitable for reducing the gas pressure from a higher upstream value to a lower downstream pressure value.

[0035] The regulator 10 comprises a structure 11, and in particular a containment structure, which may be made in one piece or, preferably, in several parts that are conveniently secured together; preferably, the structure 11 comprises within it a plurality of regions, chambers, sub-chambers, cavities and / or passages, as further described below.

[0036] The regulator 10 comprises an inlet 31 for the gas into the structure 11 and an outlet 32 ​​for the gas from the structure 11. The gas inlet 31 and the gas outlet 32 ​​are expediently provided on the structure 11. Preferably, corresponding connections are provided on the structure 11 at the gas inlet 31 and the gas outlet 32 ​​for connection to an upstream and a downstream pipe section, respectively.

[0037] Preferably, the regulator 10 also includes at least one passage 33 for fluid communication with the external environment in which the regulator is to be installed.

[0038] The regulator 10 comprises at least one control stage configured to reduce the gas pressure passing from the inlet 31 to the outlet 32 ​​as it passes through a passage opening 14.

[0039] In particular, this control stage comprises a closure 15 which is movable to close and / or block the passage opening 14.

[0040] Conveniently, the controller 10 comprises within the structure 11: - an upstream area 12 which is in fluid communication with the inlet 31, - a downstream region 13 which is in fluid communication with the outlet 32, - the passage opening 14, which lies between the upstream area 12 and the downstream area 13.

[0041] Preferably, in the possible embodiment shown in the figures, the passage opening 14 is defined in the gas fluid path between the upstream region 12 and the downstream region 13.

[0042] Conveniently, the gas in the upstream region 12 of the regulator 10 is at the pressure Pm, which corresponds to the pressure of the gas flowing into the regulator 10 and thus to the gas pressure upstream of the regulator.

[0043] Advantageously, the closure 15 is movable with respect to the passage opening 14 in such a way that the blockage of the gas passage opening 14 is varied from the upstream region 12 to the downstream region 13, thereby causing a corresponding reduction in pressure of the gas passing through the passage opening itself from the upstream region 12 to the downstream region 13.

[0044] Preferably, the controller 10 comprises a single control stage defined by the controlled movement of the shutter 15 with respect to the opening 14.

[0045] Thus, the gas in the downstream region 13 is at a pressure Pu that is lower / reduced than the pressure Pm of the upstream region 13. Conveniently, since the downstream region 13 is fluidically directly connected to the outlet 32, the gas exiting the regulator 10 is at a pressure Pu.

[0046] In a possible embodiment shown in the figures, the closure 15 is expediently movable within the downstream region 13 and, in particular, movable towards and away from the mouth of the through-opening 14, which faces the downstream region 13.

[0047] Preferably, in one possible embodiment illustrated in the figures, the upstream region 12 and the downstream region 13 overlap each other; for example, the downstream region 13 is positioned at least partially below (i.e., beneath) the upstream region 12.

[0048] The regulator 10 also comprises a control head 16 for the controlled movement of the shutter 15 of the control stage.

[0049] In particular, the control head 16 comprises a movable assembly 38 mechanically connected to the shutter 15 for the controlled movement of the latter. Conveniently, the movable assembly 38 can be mechanically connected, at least in part, to the shutter.

[0050] The movable group 38 of the control head 16 of the closure 15 comprises: - a first movable separating element 90 having a first side 91 directly acted upon by compressed gas Pu corresponding to the pressure of the gas emerging from the regulator 10 or after the regulator itself, - a second movable separating element 92 positioned on or facing a second side 93 (at least partially) of the first movable separating element 90, which is opposite the first side 91 of the first movable separating element 90 on which the compressed gas Pu acts.

[0051] Conveniently, the two movable separating elements 90, 92 are aligned and superimposed with each other along the direction of movement of the closure 15.

[0052] Conveniently, the movable group 38 also comprises a shaft 78 to which the closure 15 is attached at one of its ends and which moves fixedly with the first movable separating element 90.

[0053] The movable group 38 is configured so that: - if the first movable separating element 90 is intact and / or free from fractures or perforations, the second movable separating element 92 - act directly on the thrust means 70 - is associated with the first movable separating element 90 so that it moves fixedly with the first movable separating element 90, and - if the first movable separating element 90 is damaged and / or has fractures or perforations, the second movable separating element 92 moves independently of the first movable separating element 90.

[0054] Advantageously, therefore, the gas acts directly on the second movable separating element 92 only by passing through the first movable separating element 90 from one side to the other, and this passing occurs in the event of breakage, puncture or in any case damage to the first movable separating element 90.

[0055] Conveniently, the first movable separating element 90 is the separating element on which the compressed gas Pu acts—and in particular, directly presses—when the movable group 38 is intact, and therefore the separating element is the one that operates when the movable group 38 is intact. Therefore, the first movable separating element 90 is the main control separating element, configured and intended for operation under normal and proper operating conditions (i.e., without damage) of the regulator 10.

[0056] Conveniently, the second movable separating element 92 is the separating element on which the compressed gas Pu acts—and in particular presses directly—if the first movable separating element 90 is damaged (in particular, broken or perforated). In particular, if the first movable separating element 90 is damaged (in particular, broken or perforated), the pressure Pu of the gas tends to rise and could even reach the pressure value Pm. Preferably, the second movable separating element 92 serves as a safety and backup / reserve movable separating element in the event of damage to the first movable separating element 90. Preferably, the second movable separating element 92 serves only as a safety movable separating element and has no control function.

[0057] In particular, the control head 16 is configured so that the compressed gas Pu and the thrust means 70 act in opposite directions on the movable group 38. Preferably, in a possible embodiment shown in the figures, the control head 16 is configured so that: - the compressed gas Pu acts on the movable group 38 in a direction corresponding to the approach movement of the shutter 15 to the through opening 14 (ie acts in the closing direction), and - the thrust means 70 act on the movable group 38 in a direction opposite to that of the movement of the shutter 15 away from the through opening 14 (ie they act in the opening direction).

[0058] Conveniently, in a possible embodiment illustrated in the figures, the regulator 10 is configured so as to be normally open and, in particular, under the conditions of proper operation of the regulator 10, the action of the thrust means 70 on the mobile group 38 exceeds the action exerted by the pressurised gas Pu on the group itself, thereby moving the shutter 15 away from the passage opening 14 to allow the passage of the gas from the upstream region 12 to the downstream region 13 through this passage opening 14.

[0059] Preferably, the force / effect exerted by the thrust means 70 on the movable group 38 is adjusted so that it is below a trigger value Ps, which may be, for example, 4 - 8 bar.

[0060] Preferably, the trigger value Ps depends on the action exerted by the thrust means 70 and can, in particular, be defined entirely or at least partially (preferably for the most part) by the action exerted by the thrust means 70. Preferably, the regulator 10 is calibrated by varying / defining the force exerted by the thrust means 70 on the movable group 38.

[0061] Conveniently, in a possible embodiment shown in the figures, when the thrust exerted on the first movable separating element 90 of the movable group 38 by the compressed gas Pu exceeds the trigger value Ps and preferably exceeds the effect exerted on this movable group 38 by the thrust means 70, the movable group 38 is moved so that the shutter 15 is brought from an open position in which it is spaced from the further through-opening 14 into a closed position in which it completely closes / closes the further through-opening 14, thereby preventing the passage of the gas through this further through-opening 14.

[0062] As already mentioned, the control head 16 comprises a chamber in which the first movable separating element 90 and the second movable separating element 92 of the movable group 38 are housed to define, within the chamber itself, a first sub-chamber 75 and a second sub-chamber 76. In particular, the chamber in the control head 16 as a whole is substantially delimited by a first cover 82 and a second cover 99.

[0063] Preferably, the second sub-chamber 76 is internally bounded by a second cover 99 and the second movable partition element 92.

[0064] Preferably, this second subchamber 76 can be fluidly connected to a passage 33 for fluid communication with the environment outside the regulator 10. Therefore, the gas and / or air in this second subchamber 76 is at a pressure corresponding to atmospheric pressure or, in any case, to the pressure of the external environment in which the regulator 10 is to be installed. Ideally, the passage 33 for fluid communication with the external environment—optionally provided with a pump protection valve, a vent valve, or other suitable and conventional venting device—is retained on the second cover 99.

[0065] Conveniently, the second movable separating element 92 is directly acted upon by the thrust means 70, which preferably comprise a corresponding spring 70' housed in the second sub-chamber 76. Preferably, the spring 70' consists of a helical spring located between a wall 98 (or an equivalent fixed, possibly adjustable element) and the second movable separating element 92, which, when it rests on the first movable separating element 90, which is rigidly connected to the support shaft 78 of the shutter 15, and thus acts by thrust, causes the movement of the latter.

[0066] Preferably, a tubular section 97, closed by a cap 96, may extend outwardly from the center of the second cover 99 to at least partially accommodate the spring 70' and the wall 98. Preferably, the position of the wall 98 along the tubular section may be varied by external action of the regulator by means of a suitable control member 95, thereby varying the compression of the spring 70'.

[0067] Conveniently, the first sub-chamber 75 is defined between a first cover 82 and the first movable partition element 90.

[0068] Preferably, the first subchamber 75 is fluidically connected to a downstream region 13 and / or to a line at the outlet of this regulator 10. Therefore, the first subchamber 75 of the control head 16 is expediently at a pressure corresponding to the downstream / output pressure Pu of the regulator 10.

[0069] Preferably, the first movable separating element 90 comprises a first body of elastically deformable material, and more preferably, the first movable separating element 90 comprises a first membrane 83.

[0070] Ideally, the first movable separating element 90 may comprise a first membrane 83 made of elastically deformable material with a first support 84 made of rigid material. More specifically, the first membrane 83 faces / directs toward the first subchamber 75, while the first rigid support 84 rests on the side of the first membrane 83 opposite that facing the first subchamber. Conveniently, the first rigid support 84 may comprise a centrally perforated disc.

[0071] Preferably, in one possible embodiment (cf. Fig. 1 - 10) the first rigid support 84 comprises a centrally and slightly curved perforated disc, preferably directed in the direction of action of the compressed gas Pu on the first membrane 83.

[0072] Preferably, in a further possible embodiment (cf. Fig. 11) the first rigid support 84 comprises a centrally and substantially flat, i.e., substantially curvature-free, perforated disc. Preferably, the first movable separating element 90 may comprise a first central arrangement 72 positioned centrally on this first element. Conveniently, the first central arrangement 72 is configured to mechanically connect the first movable separating element 90 to the shaft 78 so that they are firmly connected to one another. Conveniently, the first central arrangement 72 is also configured to firmly connect the first membrane 83 and the first rigid support 84 at the respective central regions.

[0073] In detail, the first means arrangement 72 may include the following: - a first tubular element 62 (e.g., flanged bushing) having a first central through-hole into which the shaft end 78 engages, which is opposite to the one to which the closure 15 is attached; the first tubular element 62 is configured to pass through respective central through-holes aligned with each other and obtained respectively on the first membrane 83 and the first rigid support 84, - a first locking element 63, for example nut-shaped, which is configured to engage with the first tubular element 62, for example by screwing it to an externally threaded portion of the first tubular element (optionally also with the interposition of a seal and / or one or more washers), so that the first membrane 83 and the first rigid support 84, which overlap, are clamped centrally between the first tubular element 62 and the first locking element 63.

[0074] Preferably, the outer ring portion of the first movable separating element 90 - and more particularly of the first membrane 83 - is clamped between the first cover 82 and a first ring element 52.

[0075] Preferably, the first annular member 52 is configured to space the two covers 82, 99 apart and define a suitable intermediate subchamber 74 located between the first subchamber 75 and the second subchamber 76 and defined by the first movable separator 90 and the second movable separator 92. Advantageously, the first annular member 52 acts as a spacer and, in particular, prevents the second movable separator 92 from coming into contact with or interfering with the operation of the first movable separator 90 under proper operating conditions of the regulator 10 (i.e., without damage by breaking or piercing the first movable separator 90).

[0076] In particular, in the absence of damage to the first movable separating element 90, gas and / or air at a pressure corresponding to atmospheric pressure or, in any case, to the pressure of the external environment in which the regulator 10 is to be installed is present inside the intermediate subchamber 74. Instead, as a result of damage to the first movable separating element 90, gas and / or air at a pressure substantially equal to or higher than the pressure Pu enters the intermediate subchamber 74.

[0077] Preferably, the second movable separating element 92 comprises a second body made of elastically deformable material, and more preferably, the second movable separating element 92 comprises a second membrane 85. Ideally, the second movable separating element 92 may comprise a second membrane 85 made of elastically deformable material with a second support 86 made of rigid material. Conveniently, the second rigid support 86 may comprise a centrally perforated disc.

[0078] Preferably, in one possible embodiment (cf. Fig. 1 - 10) the first rigid support 86 comprises a centrally and slightly curved perforated disc, preferably directed in the direction of action of the compressed gas Pu on the first membrane 85.

[0079] Preferably, in a further possible embodiment (cf. Fig. 11) the second rigid support 86 comprises a centrally and substantially flat, i.e. substantially curvature-free, perforated disc.

[0080] In particular, the second membrane 85 faces / directs toward the intermediate sub-chamber 74 and the first movable separating element 90—and in particular, its first rigid element—while the second rigid support 86 rests on the side of the second membrane 85 opposite that facing the first movable separating element 90; more precisely, the second rigid support 86 faces the second sub-chamber 76.

[0081] Preferably, the second movable separating element 92 may comprise a second central assembly 73 positioned centrally on this second element. Conveniently, the second assembly is configured such that the second membrane 85 and the second rigid support 86 are firmly connected to each other at the respective central regions.

[0082] In detail, the second allocation of funds includes 73: - a second tubular element (e.g. flanged bushing) 64, having a second central through-opening configured to pass through respective central through-holes aligned with each other and obtained respectively on the second membrane 85 and on the second rigid support 86, - a second, preferably plug-shaped locking element 65, which is configured to engage with the second tubular element 64, for example by screwing it to an externally threaded portion of the second tubular element (optionally also with the interposition of a seal and / or one or more washers), so that the second membrane 85 and the second rigid support 86, which overlap, are clamped centrally between the second tubular element 64 and the second locking element 65.

[0083] Preferably, the second means arrangement 73 may also comprise a base 66, against which the spring end 70' of the thrust means 70 acts, coming into direct contact, opposite the spring end itself in contact with the wall 98. Ideally, the base 66 may comprise a lateral containment wall configured to adequately define a seat for the spring 70'. More specifically, the base 66 may be configured to be clamped between the second locking element 65 and an underlying washer in contact with the second rigid support 86.

[0084] Preferably, the second center arrangement 73 of the second movable partition element 92 is configured to at least partially receive the first center arrangement 72 of the first partition element 90. In particular, the second tubular element 64 is configured to at least partially receive the first tubular element 62.

[0085] Conveniently, in a possible embodiment shown in the figures, the first means arrangement 72 and the second means arrangement 73 are configured such that the second locking element 65 comes into contact (and thus acts by thrust) on the first tubular element 62 and / or on the shaft 78 in a state of full opening (ie at maximum distance of the closure 15 from the through opening 14), while the second tubular element 64 comes into contact (and thus acts by thrust) on the first locking element 63.

[0086] Preferably, the second central assembly 73 is at least partially received in the intermediate subchamber 74 and at least partially in the second subchamber 76.

[0087] Preferably, the regulator 10 is configured so that the intermediate subchamber 74 can be in fluid communication (directly or via the second subchamber 76) with the external environment in which the regulator is to be installed.

[0088] Preferably, in one possible embodiment (cf. Fig. 7 and Fig. 7A) the second means arrangement 73 has at least one fluid passage 77 between the intermediate sub-chamber 74 and the second sub-chamber 76, which is then - through the passage 33 - in fluid communication with the environment outside the regulator 10.

[0089] Preferably, the fluid passage 77 may have a passage cross-section of approximately 0.008 - 0.2 mm 2 have.

[0090] More preferably, the fluid passage 77 comprises at least one through-hole, more preferably a nozzle with a calibrated through-hole, which is provided on the second plug-shaped locking element 65 and is formed from a rigid material, such as metal or plastic. Therefore, the through-hole is advantageously provided on a rigid component and not on the second membrane 85 or on a component (or region) made of elastically deformable material.

[0091] Preferably, in one possible embodiment (cf. Fig. 9) on the first annular element 52 (at least) one further fluid passage 88 is obtained, which thus brings the intermediate subchamber 74 into direct fluid communication with the environment outside the regulator 10. This advantageously makes it possible to detect damage to the first movable separating element 90 and the sealing of the second movable separating element 92.

[0092] Conveniently, the controller 10 can be Fig. 9 all features of the controller Fig. 7, with the exception that - instead of the fluid passage 77 obtained at the second center arrangement 73 - (at least) one additional fluid passage 88 is obtained at the first ring element 52.

[0093] Preferably, the fluid passage 88 may have a passage cross-section of approximately 0.008 - 0.2 mm 2 have.

[0094] Preferably, in one possible embodiment (cf. Fig. 10) on the further fluid passage 88 - which is obtained on the first ring element 52 and which brings the intermediate sub-chamber 74 into direct fluid communication with the environment outside the regulator 10 - a valve, more preferably a flow limiting valve, is installed.

[0095] Conveniently, the controller 10 can be Fig. 10 all features of the controller Fig. 9 with the addition of a valve at this additional fluid passage 88.

[0096] Preferably, the outer ring portion of the second movable separating element 92 - and in particular of the second membrane 85 - is clamped between the first ring element 52 and a second ring element 53.

[0097] Conveniently, the two overlapping ring elements 52 and 53 are clamped between the corresponding outer (circumferential) ring portions of the two covers 82, 99, which are held together by mechanical tightening means 40. In particular, the mechanical tightening means 40' may comprise fastening elements (e.g., cap screws or other equivalent elements such as rivets) passing through, in the following order (or in reverse order), the respective through-holes defined in the outer ring portion of the second cover 99, in the second ring element 53, in the ring portion of the second movable separating element 92 (and in particular the second membrane 85), in the first ring element 52, in the ring portion of the first movable separating element 90 (and in particular the first membrane 83), and in the outer ring portion of the first cover 82; In addition, clamping elements 41 (e.g.,clamping grooves) are provided which engage the portion of the fastening elements 40' emerging from the first cover 82 (or possibly from the second cover 99, if inserted in the reverse order to that indicated above), the two ring elements 52, 53 and the two movable separating elements 90, 92 being retained and pressed between the two covers.

[0098] In particular, it turns out that: - the outer ring portion of the first movable separating element 90 is clamped between the outer ring portion of the first cover 82 and the first ring element 52, - the outer ring portion of the second movable separating element 92 is clamped between the first ring element 52 and the second ring element 53, - the outer ring portion of the second cover 99 rests on / comes into contact with the second ring element 53.

[0099] Preferably, the second ring member 53 includes a limit switch portion 55 configured to serve as a limit switch (i.e., a mechanical stop) for the movement of the second movable separating member 92. Ideally, the limit switch portion 55 is configured to project radially into the second subchamber 76 and may include a tooth projecting radially into the second subchamber against which the second rigid material support 86 of the second movable separating member 92 is intended to abut, thereby defining the limit switch of the second movable separating member 92.

[0100] If the first movable separating element 90 is damaged by breakage or puncture, the compressed gas Pu present in the first sub-chamber 75 flows—as it passes from side to side through the first movable separating element 90—into the intermediate sub-chamber 74 and thus acts directly on the second movable separating element 92. Advantageously, in this case, the compressed gas Pu acting directly on the second movable separating element 92 presses it until it strikes the limit switch section 55. Specifically, in one possible embodiment illustrated in the figures, the compressed gas Pu acts directly on the second membrane 85 by placing it completely on the second rigid support 86 and then moving it until it comes into contact with the limit switch section 55 of the second annular element 53.Essentially, in the event of damage due to breakage or piercing of the first movable separating element 90, the second movable separating element 92 is completely placed on the limit switch section 55 of the second ring element 53, thereby making it possible to safely withstand even particularly high gas pressures and, in particular, to withstand the maximum design pressure.

[0101] Unlike known solutions, the second movable separating element 92 - and in particular the membrane 85 of the second movable separating element 92 - always remains spaced from the second cover and, in particular, never comes into contact with the second cover 99; advantageously, this allows the use of a second, thinner membrane 85 - preferably the same or similar to the first membrane 83 of the first movable separating element 90 - and potentially makes it possible to make the second cover 99 from a less robust material or with less material, thus achieving a reduction in production costs; moreover, since the second membrane 85 never comes into contact with the second cover 99, the shape of the second membrane 85 of the second movable separating element 92 is not tied to the shape of the second cover.

[0102] In a possible and preferred embodiment, the limit switch portion 55 is configured to replicate the corresponding internal shape of the second cover 99 at the portion extending inward from the substantially flat outer ring portion with a curved profile. Conveniently, at least one sealing element 54 can be inserted between the second ring element 53 and the second cover 99.

[0103] Preferably, the first movable partition 90 and the second movable partition 92 are substantially identical and, particularly advantageously, substantially interchangeable. Ideally, the components of the first movable partition 90 and the second movable partition 92 are substantially identical in terms of materials, shapes, and dimensions. This is particularly advantageous from a production, logistical, and economic perspective, as it eliminates the need to manufacture a second movable partition 92 (which acts as a safety) with different dimensions and thicknesses than the first movable partition (which acts as the main regulator), thereby reducing mold manufacturing costs and storage costs.

[0104] Specifically, the first diaphragm 83 of the first movable partition member 90 and the second diaphragm 85 of the second movable partition member 92 can be made of the same material. Specifically, the first diaphragm 83 of the first movable partition member 90 and the second diaphragm 85 of the second movable partition member 92 can be identical in shape and size.

[0105] Specifically, the first rigid support 84 of the first movable partition element 90 and the second rigid support 86 of the second movable partition element 92 can be made of the same material. Specifically, the first support of the first movable partition element 90 and the second rigid support of the second movable partition element 92 can be identical in shape and size.

[0106] Preferably, in one possible embodiment, the control stage can be of the "fail-to-open" type, i.e., it can be configured to be placed in an open state (i.e., the closure 15 of the control stage moves away from the through-opening 14) upon failure / breakage of the first separating element 90. This can conveniently be caused by the total weight of the first means arrangement 72, the shaft 78, and / or the closure 15, which are rigidly connected to one another. Preferably, in this case, the regulator 10 is generally installed such that the direction of action of the thrust means 70 coincides with the direction of gravity.

[0107] In another possible embodiment, as described in Fig. 11, the controller 10 may comprise substantially all features, including optional / preferred ones, as described above, particularly with respect to the embodiments of the Fig. 1 - 10, wherein - in a state of complete opening of the closure 15 - the first movable separating element 90 (with the first membrane 83 and the first rigid support 84) and the second movable separating element 92 (with the second membrane 82 and the second rigid support 85) have a surface extension which is completely or largely flat and free of curvature and which is also perpendicular to the direction of action of the gas on the corresponding element and / or to the direction of movement of the thrust means 70.

[0108] In particular, the first movable separating element 90 is substantially parallel and coplanar with a first surface of the first ring element 52, while the second movable separating element 92 is substantially parallel and coplanar with the other (second) surface (opposite the first surface) of the first ring element 52.

[0109] Conveniently, the first ring element 52 can have a polygonal, for example substantially rectangular, cross-section (cf. Fig. 11), or it may be substantially rounded, for example substantially elliptical (cf. Fig. 1 - 10). It is useful to assume that the controller also consists of Fig. 11 - although it is shown in a version in which a fluid passage 77 is provided, which is obtained in the second central arrangement 73, for fluidly connecting the intermediate sub-chamber 74 with the second sub-chamber 76, which is then in fluid communication with the environment outside the regulator through the passage 33 - a further fluid passage 88 could be obtained on the first annular element 52 for direct fluid communication of this intermediate sub-chamber 74 with the environment outside the regulator 10. Operation

[0110] Conveniently, when the first movable separating element 90 is intact and undamaged (i.e., there are no cracks or punctures), the pressurized gas Pu arriving and present in the first sub-chamber 75 does not pass through the first movable separating element 90 and therefore does not come into direct contact with the second movable separating element 92. The thrust means 70 acting on the second central assembly 73 of the second movable separating element 92 press and hold this second central assembly 73 in contact with the first central assembly 72 of the first movable separating element 90, which moves rigidly with the support shaft 78 of the closure 15. Thus, the second movable separating element 92 is essentially invisible and unimportant for the operation of the first movable separating element 90.

[0111] Therefore, in this case, the movement of the shutter 15 relative to the through-hole 14 is controlled by the compressed gas Pu acting directly on the first movable partition element 90, as opposed to the action of the pushing means 70 acting (indirectly) on the first movable partition element 90 by forcing the second center assembly 73 into contact with the first center assembly 72 of the first movable partition element 90. In particular, as already mentioned, the regulator 10 is configured so that, even in a state of maximum distance of the shutter 15 from the through-hole 14, the pushing means 70 act to push and maintain the second center assembly 73 of the second movable partition element 92 in contact with the first center assembly 72 of the first movable partition element 90.

[0112] Conveniently, when the first movable separating element 90 is damaged (i.e. there are fractures or perforations), the compressed gas Pu - arriving and present in the first sub-chamber 75 - passes through this first element from the first side 91 to the second side 93 and therefore, upon entering the intermediate sub-chamber 74, comes into direct contact with the second movable separating element 92 and thus presses on it until it is brought into abutment with the limit switch portion 55 of the second ring element 53. Furthermore, in the embodiments of the Fig. 7 and Fig. 11, the gas present in the intermediate sub-chamber 74 enters the second sub-chamber 76 through the fluid passage 77 of the second central arrangement 73, from which it can then exit the regulator 10 through the passage 33 for fluid communication with the environment outside the regulator, thereby making it possible to perceive the smell of the gas from the outside and to detect the anomaly of the regulator. Conveniently, in the embodiments of the Fig. 9 and Fig. 10 the gas present in the intermediate sub-chamber 74 can escape directly to the outside of the regulator 10 through the further fluid passage 88, whereby it is possible to perceive the smell of the gas from the outside and to detect the anomaly of the regulator.

[0113] In a suitable traditional manner, suitable seals, for example of the O-ring type, can be mounted within the structure 11 at the contact areas and mechanical couplings between the various components, both moving and fixed, in order to ensure gas tightness between the various areas and sub-chambers and thus avoid gas leaks.

[0114] In view of this, it is clear that the solution according to the innovation is particularly advantageous since it allows to achieve the set objectives.

Claims

[1] Regulator (10) for a gas control device, and in particular of a type suitable for installation in a gas transmission and / or distribution network, comprising a structure (11) with a gas inlet (31) and a gas outlet (32), wherein: - the regulator (10) comprises at least one control stage configured to reduce the gas pressure passing from the inlet (31) to the outlet (32) when passing through a through-opening (14), the control stage comprising a closure (15) movable to close and / or block the through-opening (14), - the regulator (10) comprises a control head (16) for the controlled movement of the shutter (15) of the control stage, the control head (16) comprising a movable group (38) mechanically connected to the shutter (15) for the controlled movement of the shutter (15), - the control head (16) is configured so that the movable group (38) is acted upon in opposite directions by thrust means (70) and compressed gas Pu, which corresponds to the pressure of the gas emerging from the regulator (10) or after the regulator itself, and characterized by that the movable group (38) of the control head (16) of the shutter (15) of the control stage comprises: - a first movable separating element (90) having a first side (91) on which compressed gas Pu acts directly, - a second movable separating element (92) positioned on or facing a second side (93) of the first movable separating element (90) opposite the first side (91) of the first movable separating element (90) on which the compressed gas Pu acts. [2] The regulator of claim 1, wherein the movable group (38) is configured such that: - when the first movable separating element (90) is intact and / or free from fractures or perforations, the second movable separating element (92) is associated with this first movable separating element (90) in such a way that it moves firmly with the first movable separating element (90), - if the first movable separating element (90) is damaged and / or has fractures or perforations, the second movable separating element (92) moves independently of the first movable separating element (90). [3] Regulator according to one or more of the preceding claims, wherein the pushing means (70) act directly on the second movable separating element (92) by pushing it in the direction of the first movable sub-element (90). [4] Controller according to one or more of the preceding claims, wherein: - the control head (16) comprises a chamber enclosed by a first cover (82) and a second cover (99) and in the interior of which the first movable separating element (90) and the second movable separating element (92) of the movable group (38) are accommodated, - within this chamber is defined: ▪ a first sub-chamber (75) between the first cover (82) and the first movable separating element (90), ▪ a second sub-chamber (76) between the second cover (99) and the second movable separating element (92), ▪ an intermediate sub-chamber (74) located between the first sub-chamber (75) and the second sub-chamber (76) and delimited by the first movable partition element (90) and the second movable partition element (92). [5] Regulator according to one or more of the preceding claims, wherein the second movable separating element (92) always remains spaced from the second cover (99). [6] Regulator according to the preceding claim, wherein the second sub-chamber (76) is fluidly connected to a passage (33), preferably obtained in the second cover (99), for fluid communication with the environment outside the regulator (10). [7] Controller according to one or more of the preceding claims, wherein: - the first movable separating element (90) comprises a first membrane (83) made of elastically deformable material with a first support (84) made of rigid material, - the second movable separating element (92) comprises a second membrane (85) made of elastically deformable material with a second support (86) made of rigid material. [8] Controller according to one or more of the preceding claims, wherein the first movable separating element (90) and the second movable separating element (92) are substantially the same and preferably interchangeable. [9] Controller according to one or more of the preceding claims, wherein: - the outer ring portion of the first movable separating element (90) and preferably the outer ring portion of the first membrane (83) of the first movable separating element (90) is clamped between the first cover (82) and a first ring element (52), - the outer ring portion of the second movable separating element (92) and preferably the outer ring portion of the second membrane (85) of the second movable separating element (92) is clamped between the first ring element (52) and a second ring element (53). [10] A regulator according to the preceding claim, wherein the first ring element (52) and the second ring element (53) which overlap each other are clamped between the respective outer ring portions of the first cover (82) and the second cover (99) which are held together by mechanical tightening means (40). [11] A regulator according to the preceding claim, wherein the second ring member (53) comprises a limit switch portion (55) configured to serve as a limit switch for the movement of the second movable separating member (92). [12] Controller according to one or more of the preceding claims, wherein: - the first movable separating element (90) comprises a first central arrangement (72) which is positioned centrally on the first movable separating element (90), - the first means arrangement (72) is configured to mechanically connect the first movable separating element (90) to a support shaft (78) of the closure (15), - the first central arrangement (72) is also configured such that the first membrane (83) and the first rigid support (84) are firmly connected to one another at the respective central regions, - the second movable separating element (92) comprises a second central arrangement (73) which is positioned centrally on the second movable separating element (92), - the second central arrangement (73) is configured such that the second membrane (85) and the second rigid support (86) are firmly connected to one another at the respective central regions, - the thrust means (70) act by thrust directly on the second means arrangement (73). [13] Regulator according to one or more of the preceding claims, wherein at least one fluid passage (77) is provided between the intermediate sub-chamber (74) and the second sub-chamber (76), preferably at least one fluid passage (77) is obtained in the second central arrangement (73). [14] Regulator according to one or more of the preceding claims, wherein at least one further fluid passage (88) is maintained on the first ring element (52) for direct fluid communication of the intermediate sub-chamber (74) with the environment outside the regulator (10). [15] Regulator according to one or more of the preceding claims, wherein the control stage is configured such that, upon failure / breakage of the first separating element (90), it is placed in an open state in which the closure (15) of the control stage is guided away from the through opening (14).

Images