The object of the present invention is an intercepting
valve suitable for intercepting a fluid in a duct. In particular, the object of
the present invention is a ball valve.
A ball valve of the type currently known comprises a hollow
seating body and a spherical body, seated in the seating body and intended for intercepting
the fluid. The spherical body is provided with a through duct, which exhibits an
inlet and an outlet. When the spherical body is rotated, the valve switches from
a closed configuration, wherein the fluid flow is blocked, to an open configuration,
passing through a sequence of intermediate configurations.
In the field of ball valves, the need of obtaining a linear
matching between the angle of rotation of the spherical body and the fluid flow
rate in output from the valve is especially felt.
To meet such need, some known solutions exhibit a shape
of the inlet or of the outlet of the duct of the spherical body, designed so as
to obtain, by rotating the spherical body, such fluid flow gap as to generate a
linear matching between the angle of rotation and the downstream flow rate of the
Ball valves of the type described above are shown, for
example, in document
However, known solutions do not fully meet the requirement.
This is due, in particular, to the fact that the rate of fluid downstream of the
valve does not only depend on the extension of the fluid flow gap through the spherical
body, but also on other factors, such as for example the onset of fluid-dynamic
The object of the present invention is to provide a ball
valve suitable for obtaining a substantially linear matching between the angle of
rotation of the spherical body and the fluid flow rate downstream of the valve.
The features and advantages of the ball valve according
to the present invention will appear more clearly from the following description,
made by way of an indicative and non-limiting example with reference to the following
- figure 1 shows a plan view of an intercepting valve;
- figure 2 shows a front view of the valve of figure 1;
- figure 3 shows a side section view of the valve of figure
1, obtained with a section plane having trace III-III in figure 1;
- figure 4 shows a front view of an intercepting element
of the valve of figure 1;
- figure 5 shows a side view of the intercepting element of figure 4; and
- figure 6 shows a side section view of the intercepting element of figure
4, obtained with a section plane having trace VI-VI in figure 4.
With reference to the annexed figures, reference numeral
1 globally denotes an intercepting valve according to the present invention, in
particular a ball valve.
Said valve 1 is associable to an upstream portion and to
a downstream portion of a duct and is suitable for intercepting a flow of a fluid
in said duct, for allowing the flow of said fluid from the upstream portion to the
downstream portion or for preventing said flow.
Valve 1 comprises a seating body 2 which exhibits an inner
cavity 4 having an extension along a longitudinal axis (X-X) between a first section
6 for the fluid inlet from said upstream portion of the duct and a second section
8 for the fluid outlet towards said downstream portion of the duct.
According to a preferred embodiment, said body 2 comprises
a tubular inlet portion 10 which delimits an inlet space 12 of cavity 4. Said body
2 further comprises a central body portion 14 which delimits an intermediate chamber
16 of said cavity 4. Moreover, body 2 comprises a tubular outlet portion 18 which
delimits an outlet space 20 of said cavity 4.
Preferably, moreover, body 2 comprises at least one annular
projection 22. Preferably, said body 2 comprises two annular projections 22, respectively
arranged at the opening between said inlet space 12 and said intermediate chamber
16 and at the opening between said outlet space 20 and said intermediate chamber
Moreover, valve 2 comprises an intercepting body 30, seated
in said cavity 4 of body 2, preferably in said intermediate chamber 16.
The intercepting body 30 is suitable for being manipulated
for switching from a closed configuration, wherein it prevents the fluid flow from
said upstream portion to said downstream portion, to an open configuration, wherein
said flow is permitted.
According to a preferred embodiment, said valve 1 comprises
operating means, operatively connected to said intercepting body, for example mechanically
connected to said intercepting body, for manipulating said intercepting body 30
between said closed configuration and said open configuration and vice versa.
For example, said operating means comprise a lever actuable
by hand or a motor, for example electrical.
Preferably, said intercepting body 30 is a spherical element
that can be manipulated in rotation about an axis of rotation Y-Y substantially
perpendicular to said longitudinal axis X-X.
Said spherical element exhibits a through hole 32 suitable
for placing said upstream portion in fluid communication with said downstream portion
in said valve open configuration.
Moreover, valve 1 comprises an interference element 40,
separate from said intercepting body 30, suitable for being impinged, at least with
a portion thereof, by said fluid flow.
Preferably, said interference element 40 is seated in said
outlet space 20, in abutment with said annular projection 22 of the seating body
Preferably, said interference element 40 comprises a ring
42 suitable for positioning said interference element 40.
Said ring 42 exhibits at least one diametrical symmetry
The interference element 40 further comprises an interference
wall 44 suitable for delimiting at least a reduced section 46 for the flow of said
fluid. Said reduced section preferably exhibits a "C" shape.
Preferably, said interference wall 44 is at least partly
concave and, in accordance with an embodiment of the valve, said concavity faces
the intercepting body 30 of valve 2.
Preferably, the interference wall 44 comprises a connecting
portion 48 jointed to said ring 42 and a central portion 50 protruding from said
Preferably, said connecting portion 48 exhibits a free
edge 48a arched and convex towards said reduced section 46. Said central portion
50 protrudes from said free edge 48a.
The free edge 48a extends, in accordance with an embodiment,
entirely in a half of the section of said ring.
In accordance with a preferred embodiment, the connecting
portion 48 exhibits at least one through opening 52, preferably having a circumference
In accordance with a preferred embodiment, said through
openings 52 are in a number of two and have symmetrical arrangement and shape relative
to said symmetry axis Z-Z of ring 42 of the interference element 40.
Preferably, moreover, said central portion 50 of the interference
wall 44 is crossed by said symmetry axis Z-Z and is symmetrical relative to said
In the standard use of valve 1, in a closed configuration,
the intercepting body 30 is in a first position wherein it prevents the fluid flow
from the upstream portion to the downstream portion of the duct.
In an intermediate open configuration, the intercepting
body 30 is in a rotated position relative to the position taken in the closed configuration.
In said intermediate configuration, the through hole 32 places the inlet space 12
in communication with the outlet space 20 of the valve, but said hole is partly
blocked by the central body portion 14, so as to form a fluid flow gap having smaller
extension than the flow section of said through hole 32.
In said intermediate open configuration, said flow gap
opens in front of said interference element 40 and in particular in front of said
connecting portion 48.
In a maximum open configuration, the intercepting body
30 is in a rotated position relative to the position taken in the closed configuration.
In said maximum open configuration, the through hole 32 places the inlet space 12
in communication with the outlet space 20 of the valve and is fully free, so as
to form a fluid flow gap having extension equal to the flow section of said through
In said maximum open configuration, said flow gap opens
in front of said interference element 40 and in particular in front of said central
Innovatively, the valve according to the present invention
allows obtaining a substantially linear matching between the angle of rotation of
the spherical element and the fluid flow rate in output from the valve.
Advantageously, said valve uses the turbulence phenomena
that can be found in the motion of fluids within such valves for reaching its purpose.
In particular, said valve, and in particular the interference element installed
therein allows obtaining a turbulent motion field downstream of the intercepting
body, by suitably shaping the interference wall of said interference element.
The flow of a fluid comprises a limit layer, in the proximity
of the wall of the valve body, and a submerged jet, internal to said limit layer.
The submerged jet is associated to the predominant contribution to the flow rate.
The interference element is suitable for breaking the submerged jet in output from
the intercepting body by imposing a considerable deviation of the fluid flow also
for low rotation angles of the ball, that is, for angular positions close to the
Advantageously, moreover, the valve allows reducing the
flow rate to the values required for the use. By suitably shaping said reduced section,
different maximum values of the output flow rate are obtained.
Advantageously, moreover, said intercepting element can
be installed on already finished valves, for example by a ring nut.
In other words, unlike what happens with other solutions
currently known, the valve according to the present invention does not require the
introduction of means suitable for making the matching between the angle of rotation
and the output flow rate inside the valve linear, thus imposing a poor convenience
to the application.
It is clear that a man skilled in the art can make several
changes and adjustments to the valve described above in order to meet specific and
incidental needs, all falling within the scope of protection defined in the following