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, comprisi
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.
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1. A control valve comprising: a valve body including an inlet and an outlet;a flow shutter operatively interposed between the inlet and the outlet, the flow shutter including a radially outer cylindrical wall, a radially inner cylindrical wall and an annular-shaped base wall connecting the radially
1. A control valve comprising: a valve body including an inlet and an outlet;a flow shutter operatively interposed between the inlet and the outlet, the flow shutter including a radially outer cylindrical wall, a radially inner cylindrical wall and an annular-shaped base wall connecting the radially outer and radially inner cylindrical walls, wherein an inner volume is formed between the radially outer and inner cylindrical walls, the inner volume is closed at one end by the base wall and the inner volume opens to an outlet at an end of the flow shutter opposite to the base wall;a driving spindle including 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 of the control valve; anda differential pressure automatic regulation device including: a cup-shaped body 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, and configured to push said cup-shaped body away from the flow shutter;a rolling membrane including 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 includes at least one inlet opening facing the inlet of the valve body and wherein the outlet opening faces the cup-shaped body;wherein the valve comprises a shutter mounted around the driving spindle and facing towards the outlet opening of the flow shutter; wherein the shutter and the flow shutter delimit between them a substantially toroidal volume towards which the outlet opening of the flow shutter opens;wherein an axial distance between the shutter and the outlet opening of the flow shutter is fixed;wherein the flow from the inlet enters into the inlet opening of the flow shutter along a substantially radial direction and exits through the outlet opening of said flow shutter along a substantially axial direction to then transit towards the outlet of the valve along a substantially radial direction. 2. The valve according to claim 1, further comprising a guide shaft having an axial passage for the driving spindle, wherein the cup-shaped body is mounted around said guide shaft. 3. The valve according to claim 2, wherein the guide shaft is fixed with respect to the valve body. 4. The valve according to claim 1, wherein the spring is arranged around the cup-shaped body. 5. The valve according to claim 1, 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. 6. The valve according to claim 5, wherein the spring is axially offset with respect to the annular chamber and the spring is configured to not obstruct the flow. 7. The valve according to claim 1, wherein the valve body has a cylindrical housing configured 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 said outlet port, and wherein the cylindrical housing has a striking edge configured to receive in abutment a terminal edge of the cup-shaped body to close the outlet port of the valve body. 8. The valve according to claim 1, wherein the valve body has a cylindrical housing configured for the flow shutter and wherein the cylindrical housing has a striking edge configured to receive in abutment, while the valve is closed, a peripheral edge of the shutter. 9. The valve according to claim 1, wherein, while the valve is closed, the shutter blocks a flow outgoing from the outlet opening of the flow shutter. 10. The valve according to claim 1, wherein the shutter is at least partially housed in the cup-shaped body. 11. The valve according to claim 1, 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 and in the axial movement. 12. The valve according to claim 1, wherein an inlet slot is on the valve body between the inlet and the flow shutter. 13. The valve according to claim 12, wherein the flow shutter is rotatable in the valve body on action of the driving spindle and is axially mobile in the valve body on action of the driving spindle to change the position of its inlet opening with respect to the inlet slot. 14. The valve according to claim 1, wherein the inlet opening of the flow shutter includes at least one window. 15. The valve according to claim 13, wherein the flow shutter includes a rotation limiter cooperating with the valve body, wherein the rotation limiter is an appendage of the flow shutter inserted in a small chamber in the valve body. 16. The valve according to claim 1, wherein the flow shutter comprises a single wide opening covered by a sheet, wherein the sheet includes a plurality of windows. 17. The valve according to claim 14, wherein said at least one window is at least one slit inclined with respect to the principal axis of the control valve. 18. The valve according to claim 14, wherein said at least one window has a substantially arrow-shaped outline. 19. A control valve comprising: a valve body including an inlet and an outlet;a flow shutter operatively interposed between the inlet and the outlet;a driving spindle including a first actuating end and a second end opposite the first end, and connected to the flow shutter, wherein the driving spindle extends along a principal axis of the control valve; anda differential pressure automatic regulation device including: a cup-shaped body 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, and configured to push said cup-shaped body away from the flow shutter;a rolling membrane including 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 includes at least one inlet opening arranged radial to the driving spindle and facing the inlet of the valve body and at least one outlet opening axially towards the cup-shaped body;wherein the valve comprises a shutter mounted around the driving spindle axially spaced from the at least one outlet, and the shutter facing towards the outlet opening of the flow shutter;wherein the flow from the inlet enters into the inlet opening of the flow shutter along a substantially radial direction and exits through the outlet opening of said flow shutter along a substantially axial direction to then transit towards the outlet of the valve along a substantially radial direction;wherein, in at least one operating condition of the open valve, an annular chamber is formed between the at least one outlet of the flow shutter and the shutter of the valve, and the annular chamber communicates fluid laterally with the outlet of the valve body;wherein the spring is axially offset with respect to the annular chamber and does not extend into the annular chamber. 20. A control valve comprising: a valve body including an inlet and an outlet;a flow shutter operatively interposed between the inlet and the outlet;a driving spindle including a first actuating end and a second end opposite the first end, and connected to the flow shutter, wherein the driving spindle extends along a principal axis of the control valve; anda differential pressure automatic regulation device including: a cup-shaped body 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, and configured to push said cup-shaped body away from the flow shutter;a rolling membrane including 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 includes at least one inlet opening facing the inlet of the valve body and at least one outlet opening facing the cup-shaped body;wherein the valve comprises a shutter mounted around the driving spindle and facing the outlet opening of the flow shutter;wherein the at least one inlet opening in the flow shutter is configured to allow flow from the inlet to enter into the inlet opening along a substantially radial direction;wherein the outlet opening of the flow shutter and the shutter of the valve are arranged to allow flow to exit the flow shutter along a substantially axial direction and to then transit towards the outlet of the valve along a substantially radial direction;wherein the flow shutter is rotatable in the valve body on action of the driving spindle;wherein the flow shutter includes a rotation limiter cooperating with the valve body; andwherein the rotation limiter comprises an appendage developing axially from a radial edge close to a base wall of the flow shutter and remains in a small chamber;wherein the appendage interferes with a non-circular shaped wall delimiting the small chamber.
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