TECHNICAL FIELD

The present description relates to a valve, in particular to a valve with a movable obturator arranged in a valve body.

BACKGROUND OF THE DESCRIPTION

Known valves include flanges arranged at the ends of a hollow body in which the shutter moves. Said flanges can be made in a single piece with the hollow body, with relatively high costs. To reduce these costs, secondary bodies provided with a flange can be fixed to the hollow body, which thus has a simpler shape, for example substantially cylindrical. Said fixing must withstand the stresses of the ducts between which the valve is fixed, so that the secondary bodies are fixed to the hollow body by means of a relatively high number of axial screws, with consequent relatively long assembly times. To reduce costs, a flange for the shutter control stem is also fixed to the hollow body by means of a plurality of axial screws, again with consequent relatively long assembly times.

SUMMARY OF DESCRIPTION

An objective of the present description is to provide a valve free from such drawbacks. Said objective is achieved with a valve whose main characteristics are specified in the attached claims.

Thanks to a particular ring split in arcs, at least one secondary body provided with a flange can be fixed to a hollow body of the valve in a fast and robust fashion.

The cross-section and adjacent surfaces of such arcs may have particular profiles and shapes which allow shape couplings to improve valve strength.

Special stops can be placed between the hollow body and the secondary body, again to improve the robustness of the valve.

Furthermore, radial holes can be made in the hollow body to permanently or temporarily fix the arcs of the ring and / or the internal terminal portion of the secondary body.

The flange for the shutter control stem is fixed to the hollow body by means of a particular threaded ring or by means of a shaped coupling, in particular a bayonet. The flange for the control stem of the shutter can also be made in one piece with the secondary body, in which case the hollow body of the valve is the sleeve which includes the control stem and which is fixed to a main body of the valve in which the shutter moves.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and characteristics of the valve according to the present description will become evident to those skilled in the art from the following detailed and non-limiting description of some of its embodiments with reference to the attached drawings in which:

- Figure 1 shows an isometric view of the first embodiment of the valve ;

- figure 2 shows a front view of the valve of figure 1 :

- figure 3 shows the section III-III of figure 2;

- figure 4 shows the section IV-IV of figure 3;

- Figure 5 shows an exploded partial view of the valve of Figure 1;

- Figure 6 shows a view in longitudinal section of the valve of Figure 5;

- Figure 7 shows an exploded partial view of the second embodiment of the valve;

- Figure 8 shows a cross-sectional view of the valve of Figure 7;

- Figure 9 shows a view in longitudinal section of the valve of Figure 7;

- Figure 10 shows an axonometric view of the third embodiment of the valve;

- Figure 11 shows an exploded view of part of the valve of Figure 10;

- figure 12 shows a longitudinal section of the valve of figure 11;

- Figure 13 is a detail view in section showing a stop of the plurality of stops which locks two adjacent ring portions;

- Figure 14 shows an alternative embodiment in which there is a single stop that simultaneously blocks all the ring portions;

- Figure 15 is a detail sectional view showing how the single stop blocks the ring portions.

EXEMPLARY EMBODIMENTS

Referring to the figures from 1 to 6, the valve according to the present disclosure includes a hollow body 1, in particular having a substantially cylindrical tubular shape, which extends along a main axis X which identifies the direction of the fluid flowing throughout the valve between the inlet and outlet ends. In particular, the main axis X is the longitudinal axis of the hollow body 1. The present valve also comprises at least one secondary body 2 arranged at an end la of the hollow body 1 which is provided with a substantially circular opening, for example an inlet opening for the valve. The secondary body 2 presents in particular a substantially cylindrical tubular shape and is configured to connect to pipes or machinery (not shown in the figures) by means of an external flange 2a. In particular, the secondary body 2 is disposed in the hollow body 1 in a substantially coaxial manner with the main axis X and / or includes an internal terminal portion 2b configured to be disposed in the hollow body 1. The internal terminal portion 2b of the secondary body 2 comprises a collar which protrudes towards the internal surface of the hollow body 1 and is provided with gaskets (not shown in the figures) to create a perimeter hermetic seal between the internal wall of the hollow body 1 and the internal end portion 2b of the secondary body 2.

The hollow body 1 also comprises an annular groove lb which is formed in the internal surface of the hollow body 1 and which preferably has a cross section with a substantially right trapezoid shape, with the bases parallel to the main axis X, the major base facing towards the main axis X and the oblique side towards the end la of the hollow body 1.

The valve comprises also a ring 3 configured to be inserted partially within the annular groove lb to form a shoulder that goes in contact with the inner end portion 2b of the secondary body 2 for preventing the movement of the secondary body 2 towards the end la of the hollow body 1. The cross-section of a portion of the ring 3 preferably has a substantially right trapezoid shape, with the bases parallel to the main axis X, the major base facing the main axis X and the oblique side facing the end la of the hollow body 1, so that a peripheral portion of the ring 3 has substantially the same profile and substantially the same dimensions as the annular groove lb.

The ring 3 is divided into at least two arcs configured to be inserted individually inside the groove lb of the hollow body 1 to form the ring 3. In particular, the ring 3 is divided into at least four arcs 3a , 3b, 3 c and 3d, each of which cover preferably an angle of 60°-180°, in particular 80°-100°. The adjacent surfaces of two adjacent arcs are preferably flat and parallel to the main axis X. In the present embodiment, the adjacent surfaces of two pairs of adjacent arcs 3a, 3b and 3b, 3d lie on the same plane PI parallel to the main axis X and / or parallel to a plane P2 on which the adjacent surfaces of two other pairs of adjacent arcs 3 a, 3 c and 3 c, 3d lie.

The valve also comprises a shutter 4 which can move in the hollow body 1 along and / or around an axis, in particular rotate around an axis of rotation Y, substantially perpendicular to the main axis X through a control stem 5 which crosses a radial opening 6 obtained in the hollow body 1. The radial opening 6 is provided with a sleeve 7 in which the control stem 5 is arranged. One or more spacers 8 are arranged in the hollow body 1 between the shutter 4 and the secondary body 2 in order to prevent that the secondary body 2 can move along the main axis X towards the interior of the hollow body 1. In particular, the hollow body 1 comprises two spacers 8 having substantially form of a parallelepiped, which are provided with a circular opening in which a portion 4a of the shutter 4 is arranged which has a substantially cylindrical shape and protrudes axially from the shutter 4, so that the shutter 4 can rotate between the two spacers 8. Alternatively or in addition to the spacers 8, the internal surface of the hollow body 1 can comprise one or more protrusions acting as a stop for the secondary body 2.

The sleeve 7 has a collar disposed in the hollow body 1 and acting as a shoulder to prevent the sleeve 7 from escaping from the radial opening 6. The sleeve 7 is provided with a first external thread on which it is screwed a first threaded ring 9 that locks the sleeve 7 in the radial opening 6. A flange 10 is arranged around the sleeve 7 and is locked thereon by means of a second threaded ring 11 screwed onto a second external thread of the sleeve 7. One or more gaskets 12 can be arranged between the sleeve 7 and the control rod 5, in particular between the sleeve 7 and the second threaded ring 11.

The hollow body 1 can be provided with one or more radial holes 13 for screws which can be screwed into at least one threaded hole 14 obtained in the ring 3, in particular threaded holes 14 obtained in the arcs 3a, 3b, 3c and / or 3d.

The hollow body 1 can be provided with one or more radial holes 15 for screws which can be screwed into at least one threaded hole 16 obtained in the internal terminal portion 2b of the secondary body 2.

With reference to figures 7 to 9, it can be seen that in a second embodiment of the valve, similar to the first embodiment, the sleeve 7 is welded in the radial opening 6 obtained in the hollow body 1 and is provided with a seat 7a shaped for a shape coupling, in particular a snap fit coupling, to be coupled with a corresponding shaped portion 10a obtained in the flange 10, so that the flange 10 can be fixed to the hollow body 1 with a rotation of less than 360° around the Y axis of rotation.

With reference to Figures 10 to 13, it can be seen that in a third embodiment of the valve, similar to the first embodiment, one or more stops 17 are arranged in the hollow body 1 around the secondary body 2 to lock the ring 3. In in particular, the stops 17 have an arched shape in order to be arranged astride two adjacent arcs, for example 3a and 3b, of the arcs 3a, 3b, 3c and/or 3d. The stops 17 can comprise at least two tongues 18 adapted to be arranged in as many seats 19 made near the adjacent surfaces of two adjacent arcs, for example 3a and 3b, of the arcs 3a, 3b, 3c and/or 3d. The tongues 18 can be fixed to the stops 17 by means of screws screwed into axial holes made in the stops 17. The adjacent surfaces of two pairs of adjacent arcs 3a, 3b and 3a, 3c lie on a plane substantially perpendicular to two planes parallel to each other, on which lie the adjacent surfaces of two other pairs of adjacent arcs 3b, 3d and 3c, 3d. The stops 17 preferably have a cross section with a substantially right trapezoid shape, with the bases perpendicular to the main axis X, the minor base facing the end la of the hollow body 1 and the oblique side facing the ring 3, which comprises an oblique side facing the stops 17, so that the ring 3 and the stops 17 form a shape coupling that prevents the stops 17 from moving towards the end la of the hollow body 1.

In use, the secondary body 2 is inserted into the hollow body 1 through the opening of the end la until it comes into contact with the spacers 8, then the arcs 3a, 3b, 3c, 3d are inserted into the annular groove lb to form the ring 3. Each arch 3a, 3b, 3c, 3d is fixed in the annular groove lb by means of the screw screwed into the respective threaded hole 14 before the next arch is inserted. Before the last arch, for example the arc 3d, is inserted into the annular groove lb, the stops 7 are arranged around the secondary body 2 and made to rotate about the main axis X. When the last arch is also inserted in the annular groove lb, the stops 17 are made to rotate further around the main axis X in the position over two adjacent arcs and fixed to the latter by means of the tongues 18.

Preferably, the above-mentioned embodiments of the valve comprise two secondary bodies 2 which are substantially equal to each other, which are arranged at two ends la of the hollow body 1, which are substantially coaxial to the main axis X and are blocked by rings 3 which are divided into two or more arcs 3a, 3b, 3c, 3d and are arranged in annular grooves lb obtained in the hollow body 1

Referring to figures 14 and 15, it can be seen that in a fourth embodiment of the valve, similar to the second embodiment, there is a single stop 17 to be fixed to the hollow body 1 around the secondary body 2 to lock the ring 3. Also in this case, as in the previous embodiment, the stop 17 has an arched shape to be arranged astride the adjacent arcs 3a-3d, in this case to lock them all together. The stop 17 is fixed to the hollow body 1 by means of screws screwed into axial holes obtained in the stop 17. In the portion that abuts against the arcs that make up the ring 3, the stop 17 has a portion (which in figure 15 is the extreme portion at right) which has a cross section with a substantially right trapezoid shape, with the bases perpendicular to the main axis X, the minor base facing in the opposite direction to the end la of the hollow body 1 and the oblique side facing the ring 3, which includes an oblique side facing the stop 17, so that the ring 3 and the stop 17 form a shape coupling which prevents the stop 17 from moving towards the end la of the hollow body 1.

As in the previous embodiment, the secondary body 2 is inserted into the hollow body 1 through the opening of the end la until it comes into contact with the spacers 8, after which the arcs 3a, 3b, 3c, 3d are inserted into the annular groove lb to form the ring 3. Each arch 3a, 3b, 3c, 3d is fixed in the annular groove lb by means of the screw screwed into the respective threaded hole 14 before the next arch is inserted. When the last arc is positioned, the stop 17 is arranged around the secondary body 2 and is fixed to the hollow body 1 by means of screws.

Any variants or additions may be made by skilled persons to the embodiments described and illustrated herein remaining within the scope of the following claims. In particular, further embodiments may comprise the technical features of one of the following claims with the addition of one or more technical features described in the text or illustrated in the drawings, taken individually or in any reciprocal combination.