CONTROL VALVE

Abstract

A control valve including: a valve body, a flow shutter operatively interposed between an inlet and an outlet, a driving spindle having at least a first actuating end and a second end connected to the flow shutter. The valve also includes a differential pressure automatic regulation device, comprising: a cup-shaped body arranged around the driving spindle and axially mobile with respect to said driving spindle; a spring operatively interposed between the valve body and the cup-shaped body to push the latter away from the flow shutter; a rolling membrane having a radially inner edge fixed to the cup-shaped body and a radially outer edge fixed to the valve body to delimit a first chamber in fluid communication with the inlet and a second chamber in fluid communication with the outlet.

Claims

1.-18. (canceled)

19. A control valve comprising: a valve body having an inlet and an outlet; a flow shutter operatively interposed between the inlet and the outlet; a driving spindle having a first actuating end and a second end opposite the first actuating end and connected to the flow shutter, wherein the driving spindle extends along a principal axis; a differential pressure automatic regulation device comprising: a cup-shaped body around the driving spindle and axially mobile with respect to the driving spindle; a spring operatively interposed between the valve body and the cup-shaped body and configured to push the cup-shaped body away from the flow shutter; and a rolling membrane having a radially inner edge fixed to the cup-shaped body and a radially outer edge fixed to the valve body to delimit a first chamber in fluid communication with the inlet and a second chamber in fluid communication with the outlet; wherein the flow shutter has at least one inlet opening facing the inlet of the valve body and at least one outlet opening facing the cup-shaped body; and wherein the control valve further comprises a shutter mounted around the driving spindle and facing towards the outlet opening of the flow shutter.

20. The control valve according to claim 19, further comprising a guide shaft having an axial passage for the driving spindle, wherein the cup-shaped body is mounted around the guide shaft.

21. The control valve according to claim 20, wherein the guide shaft is fixed with respect to the valve body.

22. The control valve according to claim 19, wherein the spring is arranged around the cup-shaped body.

23. The control valve according to claim 19, wherein the second chamber houses the spring.

24. The control valve according to claim 19, wherein a portion of the second chamber is delimited between a radially outer surface of the cup-shaped body and a radially inner surface of the valve body, wherein the spring is arranged in the portion of the second chamber.

25. The control valve according to claim 19, wherein, in at least one operating condition of the open valve, the flow shutter and the shutter delimit between them an annular chamber communicating laterally with the outlet of the valve body.

26. The control valve according to claim 25, wherein the spring is axially offset with respect to the annular chamber.

27. The control valve according to claim 25, wherein a portion of the second chamber is delimited between a radially outer surface of the cup-shaped body and a radially inner surface of the valve body, wherein the spring is arranged in the portion of the second chamber, wherein the second chamber which contains the spring is axially offset with respect to the annular chamber.

28. The control valve according to claim 19, wherein the valve body has a cylindrical housing for the flow shutter, wherein the valve body has an outlet port between the annular chamber and the outlet and wherein the cup-shaped body, with its axial motion, shuts off the outlet port and wherein the cylindrical housing has a striking edge adapted to receive in abutment a terminal edge of the cup-shaped body to close the outlet port of the valve body.

29. The control valve according to claim 19, wherein the valve body has a cylindrical housing for the flow shutter and wherein the cylindrical housing has a striking edge adapted to receive in abutment, with the valve closed, a peripheral edge of the shutter.

30. The control valve according to claim 19, wherein, with the valve closed, the shutter blocks a flow outgoing from the outlet opening of the flow shutter which faces the shutter.

31. The control valve according claim 19, wherein the shutter is at least partially housed in the cup-shaped body.

32. The control valve according claim 19, wherein the cup-shaped body has a cylindrical wall radially outside of the shutter and sliding mobile on the shutter.

33. The control valve according claim 19, wherein the shutter closes an inner volume of the cup-shaped body and between the radially outer cylindrical wall of the cup-shaped body and the shutter a circular split is delimited which allows the fluid to pass into the inner volume.

34. The control valve according to claim 19, wherein the shutter is solidly constrained with the driving spindle in rotation motion and in axial movement and wherein the flow shutter is solidly constrained with the driving spindle in the rotation motion.

35. The control valve according claim 19, wherein an inlet slot is realized directly on the valve body between the inlet and the flow shutter.

36. The control valve according to claim 35, wherein the flow shutter is rotatable in the valve body on action of the driving spindle to change the position of its inlet opening with respect to the inlet slot.

37. The control valve according to claim 19, wherein the shutter comprises a circular plate and a shaped portion in rubber, substantially tapered, associated with the circular plate and facing the outlet opening of the flow shutter.

38. The control valve according to claim 19, wherein the inlet opening of the flow shutter has one or more windows.

39. A control valve comprising: a valve body including an inlet, an outlet and a flow passage extending from the inlet to the outlet; a flow shutter in the flow passage and between the inlet and the outlet, wherein the flow shutter includes an inlet opening facing the inlet of the valve body and an outlet opening facing a cup-shaped body; a driving spindle mounted in the valve body and extending perpendicular to a centerline of the flow passage, wherein the driving spindle includes a first actuating end and a second end opposite the first actuating end, wherein the second end is connected to the flow shutter; a shutter mounted to the driving spindle and facing towards the outlet opening of the flow shutter, and a differential pressure automatic regulation device comprising: the cup-shaped body coaxial with and extending around the driving spindle and configured to move axially in the valve body with respect to the driving spindle; a coil spring between the valve body and the cup-shaped body, being coaxial to the cup shaped body, and biasing the cup-shaped body away from the flow shutter; and an annular rolling membrane having a radially inner edge fixed to the cup-shaped body and a radially outer edge fixed to the valve body, wherein the annular rolling member separates a first chamber which is in fluid communication with the inlet from a second chamber which is in fluid communication with the outlet.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0063] This description will be explained below with reference to the attached drawings, provided solely for indicative and therefore non-limiting purposes, in which:

[0064] FIG. 1 shows an overall perspective view of the control valve according to the present invention;

[0065] FIG. 2 shows a cross-section view of the valve of FIG. 1, with several parts removed and in an operating configuration;

[0066] FIG. 3 shows an enlarged and cross-section portion of the valve of FIGS. 1 and 2;

[0067] FIG. 4 shows the valve of FIG. 2 in a different operating configuration;

[0068] FIG. 5 shows the valve of FIG. 2 in a further different operating configuration;

[0069] FIG. 6 shows an overall perspective view of a variant of the control valve according to the present invention;

[0070] FIG. 7 shows a cross-section view of the valve of FIG. 6, with several parts removed and in an operating configuration;

[0071] FIG. 8 shows an embodiment of an exploded detail relating to the valves of the previous figures;

[0072] FIG. 9 shows a variant of an element shown in FIG. 8;

[0073] FIG. 10 shows a different embodiment of the detail of FIG. 8.

DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION

[0074] With reference to FIG. 1, the number 1 denotes in its entirety a control valve comprising a valve body 2 and an actuator 3 mounted on the valve body 2. The valve body 2 has an inlet 4 and an outlet 5 for flow of a liquid. Said inlet 4 and outlet 5 are threaded internally for connection to respective pipe ends.

[0075] As visible in FIGS. 2, 4 and 5, the valve body 2 has a principal body 2a afforded in a single piece and having said inlet 4 and said outlet 5 aligned along a flow direction Y-Y. The valve body 2 comprises an auxiliary body 2b screwed onto the principal body 2a and having an axial passage 6 which develops along a principal axis X-X. The principal body 2a of the valve body 2 delimits internally, in addition to the inlet 4 and to the outlet 5, a substantially cylindrical cavity which develops along said principal axis X-X and is formed by several axial cross-sections, as detailed here below. In the embodiment shown, the principal axis X-X is perpendicular to the flow direction Y-Y. In variants not shown, the angle delimited between said principal axis X-X and the flow direction Y-Y may be different to 90?.

[0076] The valve body 2 also has pressure intakes 101, 102 for housing and/or connection with appropriate pressure sensors and/or differential pressure gauges. A first pressure intake is in fluid communication with the inlet 4 and a second pressure intake is in fluid communication with the outlet 5. Said intakes 101, 102 are inclined with respect to the principal axis X-X and also with respect to the flow direction Y-Y and are placed on opposite sides of the auxiliary body 2b and the actuator 3.

[0077] Starting from a first axial end E1 of the valve body 2 opposite the auxiliary body 2b and moving towards a second axial end E2 at said auxiliary body 2b, the substantially cylindrical cavity has a first section 7, a second section 8 of higher radial dimensions to the first section 7, a third section 9 of higher radial dimensions to the second section 8 and a fourth section 10 of higher radial dimensions to the third section 9.

[0078] The first section 7 defines a small chamber connected to the inlet 4 through a straight channel 11 afforded in the principal body 2a. The second section 8 defines a cylindrical housing placed between the inlet 4 and the outlet 5 and in direct communication with the inlet 4 through an inlet slot 12 afforded in a wall of the valve body 2 which delimits said cylindrical housing. The inlet slot 12 has an elongated development along a circumferential direction. The third section 9 and the fourth section 10 define together a cylindrical seat. The third section 9 also has an outlet port 13 which communicates directly with the outlet 5 of the valve body 2.

[0079] A driving spindle 14 is inserted in the axial passage 6 of the auxiliary body 2b and develops in said substantially cylindrical cavity of the principal body 2 towards the first axial end E1. A first actuating end 14a of the driving spindle 14 projects from the auxiliary body 2b and a second end 14b of said driving spindle 14, opposite the first end 14a, is placed inside the cylindrical housing 8 and facing the small chamber 7 (FIGS. 3 and 5).

[0080] Inside the auxiliary body 2b and around the driving spindle 14 is delimited a volume 15 containing a principal spring 16 of helical type which surrounds the driving spindle 14.

[0081] The principal spring 16 has an end in abutment against an annular surface of the auxiliary body 2b and an opposite end in abutmente against a ring 17 axially solid with the driving spindle 14 and, for this purpose, partially inserted in an annular cavity afforded at the first end 14a of the driving spindle 14. The first end 14a is also coupled to an actuating group D engaged by the actuator 3. The principal spring 16 elastically pushes the driving spindle 14 away from the first axial end E1 of the valve body 2.

[0082] A flow shutter 18 is mounted on the second end 14b of the driving spindle 14 and is housed in the cylindrical housing 8 (FIGS. 3 and 5). The flow shutter 18 comprises a radially outer cylindrical wall 19, a radially inner cylindrical wall 20 and an annular-shaped base wall 21 which connects said cylindrical walls 19, 20. The radially outer cylindrical wall 19, the radially inner cylindrical wall 20 and the base wall 21 delimit an inner volume 22 which leads into an annular outlet opening 23 placed in an axially opposite position to the base wall 21. Through the radially outer cylindrical wall 19 is afforded an inlet opening formed by a plurality of windows 24 reciprocally facing along a circumferential direction and each having a mainly axial development. The radially outer cylindrical wall 19 is placed in contact with the cylindrical housing 8 with interposition of annular seals. The radially inner cylindrical wall 20 surrounds and is placed in contact, with interposition of seals, with the driving spindle 14. The flow shutter 18 is blocked on the driving spindle 14 so as to remain solidly constrained with it in both axial motion and in rotation around the principal axis X-X. The flow shutter 18 also comprises an appendage 25 which develops axially from a radial edge close to the base wall 21 and remains in the small chamber 7. The appendage 25 interferes with a non-circular shaped wall which delimits the small chamber 7 and acts as a rotation limiter for the flow shutter 18.

[0083] A shutter 26 is mounted around the driving spindle 14 and is blocked on the driving spindle 14 so as to remain solidly constrained with it in both axial motion and in rotation around the principal axis X-X. The shutter 26 comprises a circular plate 27 and a shaped portion 28, preferably in rubber, substantially tapered and associated with the plate 27 and facing the outlet opening 23 of the flow shutter 18. The shutter 26 and the flow shutter 18 are solidly constrained to each other in the axial movement and in the rotation movement. Therefore, the axial distance between the shaped portion 28 of the shutter 26 and the outlet opening 23 of the flow shutter 18 is fixed. In particular, the substantially tapered shaped portion 28 has two successive tapered portions converging towards the driving spindle 14 and towards said outlet opening 23. The shutter 26 and the flow shutter 18 delimit between them a substantially toroidal volume towards which the outlet opening 23 of the flow shutter 18 opens. The shaped portion 28 of the shutter 26 has a radially peripheral edge 29 destined to enter into contact with a striking edge 30 of the cylindrical housing 8 orthogonal to the principal axis X-X and defined between the second section 8 and the third section 9 of the substantially cylindrical cavity of the principal body 2a.

[0084] A cup-shaped body 31 is mounted around the driving spindle 14 and is axially positioned in the cylindrical seat defined by the third section 9 and the fourth section 10. In greater detail, the cup-shaped body 31 has an axial hole through which passes a guide shaft 32 defined by an inner portion of the auxiliary body 2b. Said axial passage 6 of the auxiliary body 2b is partially afforded in the guide shaft 32 so that said guide shaft 32 remains radially interposed between the driving spindle 14 and the cup-shaped body 31. The cup-shaped body 31 has a first portion 33 with lower radial dimensions coupled sliding to the guide shaft 32 with interposition of an annular seal preferably placed in an annular seat of said guide shaft 32. The cup-shaped body 31 has a second portion 34 with higher radial dimensions such as to house the shutter 26 inside it. A terminal edge 35 (FIG. 3) of the second portion 34 of the cup-shaped body 31 is destined to enter into striking contact with a striking edge 30 of the cylindrical housing 8 in a radially more outer zone with respect to the striking zone of the shutter 26. The cup-shaped body 31 has a radially outer annular appendage 36 axially placed between the first portion 33 and the second portion 34. A helical spring 37 is arranged around the cup-shaped body 31 and has an axial end placed in striking contact against said annular appendage 36 and an opposite axial end in abutment against an abutment surface 38 defined between the third section 9 and the fourth section 10 of the substantially cylindrical cavity of the principal body 2a.

[0085] A rolling membrane 39 surrounds the cup-shaped body 31 and has a radially inner edge 40 sealingly constrained to said cup-shaped body 31, preferably placed in a radially outer annular seat, and a radially outer edge 41 sealingly constrained to the valve body 2, preferably closed between the principal body 2a and the auxiliary body 2b. The rolling membrane 39 delimits, together with the inner walls of the valve body 2 and precisely the auxiliary body 2b, a first chamber 42 axially placed between the cup-shaped body 31 and the auxiliary body 2b. The rolling membrane 39 also delimits, together with a radially outer surface of the cup-shaped body 31 and a radially inner surface of the principal body 2a, a second chamber 43 axially placed between said membrane 39 and the abutment surface 38. The spring 37 thus remains placed in a portion of said second chamber 43. The cup-shaped body 31 is mobile axially in an independent way from the guide shaft 14 and therefore also from the shutter 26 and from the flow shutter 18 under the action of the pressures acting in the first chamber 42 and in the second chamber 43 and of the spring 37. The cup-shaped body 31 with its axial movement is able to shut off or close the outlet port 13.

[0086] The cup-shaped body 31, the rolling membrane 39 and the spring 37 are part of a differential pressure automatic regulation device, as will be detailed below.

[0087] The shutter 26 closes an inner volume 44 of the cup-shaped body 31 which is substantially at the same pressure of the second chamber 43 because between a radially inner surface of the radially outer cylindrical wall 43 of the cup-shaped body 31 and a peripheral edge of the plate 27 a circular split 45 (FIG. 3) remains through which the liquid passes. Said inner volume of the cup-shaped body 31 is variable due to the relative motion possible between said cup-shaped body 31 and the shutter 26.

[0088] In use and with the valve open (FIGS. 2 and 4), the flow of liquid enters into the inlet 4, passes through the inlet slot 12 and the portion/s of the window/s 24 of the inlet opening of the flow shutter 18 facing said slot 12 and enters into the inner volume 22. The liquid rises axially towards the outlet opening 23 of the flow shutter 18 reaching an annular chamber delimited by the flow shutter 18, by the shutter 26 and by radially inner surfaces of the third section 9 and the second section 8 of the substantially cylindrical cavity of the principal body 2a. The principal flow of the liquid then continues towards the outlet 5 passing through the outlet port 13.

[0089] The flow rate is pre-set by rotating the flow shutter 18 by means of the driving spindle 14 in a pre-selected angular position, so that a specific number of windows 24 are facing the inlet slot 12. Rotation is performed manually by means of a regulating ring nut 51 mounted on the first end 14a of the driving spindle 14. The ring nut 51 may be reached by dismantling the actuator 3. During functioning of the valve 1, said angular position remains fixed.

[0090] The liquid in the inlet 4 is at a specific upstream pressure P+. In passage through the flow shutter 18 and due to the resistances given both by the flow shutter 18 and by the shutter 26, the liquid suffers a drop in pressure down to a downstream pressure P? which is in the annular chamber 46 and substantially also at the outlet 5.

[0091] The liquid at upstream pressure P+ is also present in the first chamber 42 because from the inlet 4 it passes into the straight channel 11, into the small chamber 7, through an axial conduit 47 afforded in the driving spindle 14, through radial passages 48 of said spindle 14, through radial passages 49 of the guide shaft 32 and through a hollow space 50 delimited between the guide shaft 32 and the cup-shaped body 31 which in turn communicates with the first chamber 42 (FIG. 3).

[0092] The liquid at downstream pressure P? is also present in the second chamber 43 because from the annular chamber 46 it passes into the second chamber 43 through an annular passage delimited between the cup-shaped body 31 and a radially inner surface of the principal body 2a close to the abutment surface 38. The liquid at downstream pressure P? is also present in the inner volume of the cup-shaped body 44 because it passes through the circular split 45.

[0093] Therefore the upstream pressure P+ acts in the first chamber 42 on the rolling membrane 39 and on the cup-shaped body 31 and the downstream pressure P? acts in the second chamber 43 and in the inner volume of the cup-shaped body 44 on said cup-shaped body 31 and partly also on the membrane 39. A force on the cup-shaped body 31 corresponds with upstream pressure P+ directed from the second end E2 towards the first end E1. A force on the cup-shaped body 31 corresponds with downstream pressure P? directed from the first end E1 towards the second end E2 which adds up to the force generated by the spring 37.

[0094] The equilibrium of the force generated by the upstream pressure P+ with the one generated by the downstream pressure P? increased by the elastic reaction of the spring 37 changes the position of the cup-shaped body 31 and the amplitude of the outlet port 13, guaranteeing continual constancy of the flow rate automatically. In the absence of differential pressure, the spring 37 maintains the cup-shaped body 31 in the position closest to the second end E2 and the outlet port 13 completely open.

[0095] A modulation of the flow rate may also be made, around the flow rate pre-set manually, by axially moving the driving spindle 14 by means of the actuator 3. In FIG. 2, there are windows 24 facing for their entire axial development the inlet slot 12. On the other hand, in FIG. 4 the windows 24 are shifted closer towards the first end E1 and partially closed by the wall of the principal body 2a adjacent to the inlet slot 12. Axial movement of the spindle also determines, as visible from comparison between FIGS. 2 and 4, a variation in axial development of the annular chamber 46.

[0096] FIG. 5 shows the valve 1 closed, i.e. with the shutter 26 in abutment against the striking edge 30 of the cylindrical housing 8. Said position is maintained by the actuator 3 which pushes the spindle 14 in contrast with the principal spring 16. Without the actuator 3, the principal spring 16 maintains the valve 1 in the normally open condition with the shutter 26 distanced from the striking edge 30.

[0097] FIGS. 6 and 7 show a different embodiment of the valve according to the invention. The same reference numbers already used in FIGS. 1-5 to identify corresponding elements have been used. Unlike the embodiment described above, the valve of FIG. 6 has the pressure intakes 101, 102 positioned on the opposite part of the actuator with respect to direction Y-Y along which are aligned the inlet 4 and the outlet 5 and are parallel to each other and also parallel to the principal axis X-X.

[0098] Furthermore, as visible in FIG. 7, in a radially intermediate position between the cup-shaped body 31 and the principal body 2a a cylindrical body 110 coaxial to the principal axis X-X is positioned. An upper edge 111 of the cylindrical body 110 is closed between the auxiliary body 2b and the principal body 2a and the radially outer edge 41 of the rolling membrane 39 is sealingly constrained between said upper edge 111 and the auxiliary body 2b. With respect to the embodiment of FIGS. 1-5, the radially outer edge 41 and the overall rolling membrane 39 are shifted closer towards the first end 14a of the driving spindle 14. A lower edge 112 of the cylindrical body 110 extends radially towards the principal axis X-X to define the abutment surface 38 of the spring 37 which therefore, differently to the embodiment of FIGS. 1-5, does not belong to the principal body 2a. The cup-shaped body 31 is also shifted closer towards the first end 14a of the driving spindle 14 and has a lower cylindrical appendage 120 having the terminal edge 35 destined to abut against the striking edge 30.

[0099] The embodiment of FIGS. 6 and 7 also allows a greater volume of the second chamber 43 which is at discharge pressure Pdischarge to be obtained. The second chamber 43 is in this case radially delimited between the cup-shaped body 31 and the cylindrical body 110 and between said cylindrical body 110 and the principal body 2a.

[0100] In the embodiment of FIG. 7, the presence of the terminal edge 35 of the lower cylindrical appendage 120, which remains radially distanced from the principal body 2a, ensures that the downstream pressure P? in the annular chamber 46 is different to and higher than the discharge pressure Pdischarge at outlet 5.

[0101] In the embodiment of FIGS. 6 and 7, the windows 24 are splits inclined with respect to the principal axis X-X.

[0102] FIG. 8 shows an exploded view of a variant of the flow shutter 18 of the embodiment of FIGS. 6 and 7. The radially outer cylindrical wall 19 is provided with a single wide opening 130 which extends partially around the principal axis X-X, which is covered and closed by a sheet or band 140 (shown separate in FIG. 8). The sheet 140 has slits 24 almost all inclined. In particular, sheet 140 has a first end slit 24a parallel to the principal axis X-X, a second slit 24b adjacent to the first slit 24a and the remaining slits 24 having all the same inclination greater than the one of the second slit 24b. Slits 24a, 24b, 24 are afforded in the sheet 140, for example by means of photo-engraving and/or laser, and then said sheet 140 is applied onto the opening 130.

[0103] FIG. 9 shows a variant of the sheet 140 wherein the windows 24c, 24d, 24e are shaped to give the flow shutter 18 an equal-percentage characteristic both in rotation and in translation.

[0104] FIG. 10 shows a further variant of the flow shutter 18, wherein said flow shutter 18 is a single piece (like the one shown in FIGS. 1-5, without distinction between the sheet and the rest of the body), but the windows 24 are shaped as in FIG. 9.

[0105] In a further embodiment not shown, the flow shutter 18 is a single piece and the windows 24 are inclined slits as in FIG. 7.

[0106] Windows 24c, 24d, 24e of FIGS. 9 and 10 comprise a first window 24c (visible in both FIGS. 9 and 10) elongated along a circumferential direction and having a substantially arrow-shaped outline which ends at an end with a single top and at an opposite end with two tops axially distanced from each other. A second window 24d (more visible in FIG. 9) is alongside the first window 24c and also has a substantially arrow-shaped outline, but with lower passage area and circumferential extension with respect to the first window 24c. A third window 24d (more visible in FIG. 9) is alongside the second window 24d and has a substantially isosceles triangular outline with the base which develops along a circumferential direction.

TABLE-US-00001 List of elements 1 Control valve 2 Valve body E1 First axial end of the valve body E2 Second axial end of the valve body 2a Principal body 2b Auxiliary body X-X Principal axis of the valve body 3 Actuator 4 Inlet 5 Outlet Y-Y Flow direction 6 Axial passage 7 First section/small chamber 8 Second section/cylindrical housing 9 Third section/cylindrical seat 10 Fourth section/cylindrical seat 11 Straight channel 12 Inlet slot 13 Outlet port 14 Driving spindle 14a First end of the driving spindle 14b Second end of the driving spindle 15 Volume 16 Principal spring 17 Ring 18 Flow shutter 19 Radially outer cylindrical wall 20 Radially inner cylindrical wall 21 Base wall 22 Inner volume 23 Outlet opening 24 Inlet opening 25 Appendage/rotation limiter 26 Shutter 27 Plate 28 Shaped portion 29 Radially peripheral edge 30 Striking edge 31 Cup-shaped body 32 Guide shaft 33 First portion 34 Second portion 35 Terminal edge 36 Annular appendage 37 Spring 38 Abutment surface 39 Rolling membrane 40 Radially inner edge 41 Radially outer edge 42 First chamber 43 Second chamber 44 Inner volume of the cup-shaped body 45 Circular split 46 Annular chamber 47 Axial conduit 48 Spindle radial passages 49 Guide shaft radial passages 50 Hollow space 51 Regulation ring nut 101 First pressure intake 102 Second pressure intake 110 Cylindrical body 111 Upper edge of the cylindrical body 112 Lower edge of the cylindrical body 120 Lower cylindrical appendage of the cup-shaped body 130 Wide opening of the radially outer cylindrical wall 140 Sheet or band 24a First slit 24b Second slit 24c First window 24d Second window 24e Third window