What is claimed is:
1. A fluid flow control valve with integrated pneumatic actuation, comprising a valve body which forms, inside it, a passage chamber for a fluid which is connected to an intake port and a delivery port; a sealing region being formed inside said passage chamber, between said intake port and said delivery port, and being engageable by a head of a flow control element which can move on command along an actuation path in order to pass from an open position, in which said head is disengaged and spaced from said sealing region in order to allow the connection of said intake port to said delivery port, to a closed position, in which said head engages said sealing region in order to interrupt connection of said intake port with said delivery port, and vice versa; pneumatic actuation means being provided in order to move, at least in one direction, said flow control element along said actuation path, wherein in said flow control element there is a compensation chamber which is connected in terms of pressure to said passage chamber, and wherein in said compensation chamber there are regions for applying pressure of the fluid which are adapted to convert said pressure into a contrasting force which is parallel to said actuation path and is orientated in an opposite direction with respect to a force that is parallel to said actuation path and is generated by a pressure of said fluid on a side of said head of the flow control element that is directed toward said sealing region.
2. The valve according to claim 1, wherein said regions for applying the pressure of the fluid in said compensation chamber and the region for applying the pressure of the fluid on the side of said head of the flow control element that is directed toward said sealing region have substantially mutually identical protrusions on a plane which is perpendicular to said actuation path in order to balance said force by means of said contrasting force.
3. The valve according to claim 1, wherein said compensation chamber, when said flow control element is in said closed position, is connected to said intake port.
4. The valve according to claim 1, wherein said flow control element is substantially cylindrical with an axis which is parallel to said actuation path, said head of the flow control element being constituted by an axial end of the flow control element.
5. The valve according to claim 1, wherein said sealing region is formed by an annular shoulder which is formed in said body and is arranged at right angles to an axis of said flow control element, said head of the flow control element supporting, in a front region, a gasket which faces said annular shoulder.
6. The valve according to claim 1, wherein said sealing region is formed by a cylindrical or conical surface which is formed inside said body, coaxially to said flow control element, said head of the flow control element supporting, on a cylindrical side wall thereof, a gasket which can engage or disengage said cylindrical or conical surface that constitutes said sealing region.
7. The valve according to claim 1, wherein said compensation chamber is connected, in terms of pressure, to said passage chamber through an axial passage which is formed in said head of the flow control element.
8. The valve according to claim 1, wherein said regions of the compensation chamber for applying said pressure are formed by at least an increase in diameter of said compensation chamber starting from said head toward the opposite axial end of said flow control element.
9. The valve according to claim 1, wherein on an outer lateral surface of said flow control element there is at least one axial shoulder which can engage an abutment provided inside said body in order to limit a stroke of said flow control element toward said sealing region.
10. The valve according to claim 1, wherein said pneumatic actuation means comprise a portion of the axial extension of said flow control element which is provided as a plunger and can slide within a cylindrical actuation chamber formed in said body coaxially around said flow control element, said plunger-like portion dividing said actuation chamber into two half-chambers, at least one of which can be fed with compressed air in order to move said flow control element in one direction along said actuation path.
11. The valve according to claim 10, wherein said two half-chambers can both be alternatively supplied with compressed air for the movement of said flow control element along said actuation path in one direction or in the opposite direction.
12. The valve according to claim 11, further comprising elastic means which are interposed between said flow control element and said body in order to contrast or assist the movement of said flow control element produced by the injection of compressed air into at least one of said half-chambers.
13. The valve according to claim 12, wherein said elastic means comprise a spring which is arranged in at least one of said half-chambers and is interposed between said plunger-like portion of the flow control element and an axial end of said actuation chamber.
14. The valve according to claim 13, wherein the axial end of said actuation chamber that lies opposite with respect to the head of the flow control element is closed by a cap which can be removed in order to extract or insert said flow control element with respect to said body.
15. The valve according to claim 14, wherein said cap has, on a side directed toward a inside of said body, a cylindrical protrusion which is coaxial to said flow control element and slidingly engages inside the axial end of said flow control element that lies opposite with respect to its head, said protrusion closing said compensation chamber and said actuation chamber on an opposite side with respect to said head of the flow control element.
16. The valve according to claim 1, wherein said intake port is aligned with said delivery port and wherein the axis of said flow control element is inclined with respect to the direction of the fluid that enters said intake port at an angle of more than 90.
17. The valve according to claim 1, wherein an annular chamber connected to said passage chamber is formed around the lateral surface of said flow control element, proximate to said head.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A flat aluminum electrolytic capacitor comprising a separator impregnated with an electrolytic solution, an anode foil and a cathode foil, a flat capacitor element that has external lead-out terminals connected respectively to the anode foil and the anode foil, and a flexible casing that houses the capacitor element and is hermetically sealed to define an inside of said flexible casing, the inside of the flexible casing being under reduced pressure compared to ambient pressure outside of the flexible casing.
2. The flat aluminum electrolytic capacitor in accordance with claim 1 wherein the reduced pressure is in the range of 3 to 720 mmHg.
3. The flat aluminum electrolytic capacitor in accordance with claim 1 wherein the reduced pressure is in the range of 3 to 50 mmHg.
4. The flat aluminum electrolytic capacitor in accordance with claim 1 wherein the reduced pressure is in the range of 3 to 20 mmHg.
5. A flat aluminum electrolytic capacitor having a separator impregnated with an electrolytic solution, an anode foil and a cathode foil, a flat capacitor element that has external lead-out terminals connected respectively to the anode foil and the cathode foil, and a flexible casing that houses the capacitor element and is hermetically sealed to define an inside of said flexible casing, the inside of the flexible casing being under reduced pressure compared to ambient pressure outside of the flexible casing, said capacitor being made using a process comprising a step wherein the flat capacitor element is subjected to an aging treatment after being sealed in said flexible casing.
6. The flat aluminum electrolytic capacitor in accordance with claim 5 wherein the capacitor element is a laminate element formed by laminating the cathode foil and anode foil of a predetermined size alternatively via a separator or winding a laminate of long anode and cathode foils one on another via a separator with resultant roll being flattened, the reduced pressure in the inside of the flexible casing being less than one atmospheric pressure.
7. The flat aluminum electrolytic capacitor in accordance with claim 5 further comprising an outer casing having a higher strength than the flexible casing to encase the flexible casing.
8. The flat aluminum electrolytic capacitor in accordance with claim 7 wherein the electrolytic solution contains at least one kind of nitro compound.
9. The flat aluminum electrolytic capacitor in accordance with claim 7 wherein the outer casing has at least one of a plurality of openings stopped with a sealant.
10. The flat aluminum electrolytic capacitor in accordance with claim 9 wherein the sealant is made of a sealing material selected from rubber, composite rubber and resin.
11. The flat aluminum electrolytic capacitor in accordance with claim 9 wherein the external lead-out terminals are in the form of film or foil.
12. The flat aluminum electrolytic capacitor in accordance with claim 11 wherein at least one lead terminal is provided for each external lead-out terminal.
13. The flat aluminum electrolytic capacitor in accordance with claim 12 wherein the lead terminal is integrated with the sealant.
14. The flat aluminum electrolytic capacitor in accordance with claim 13 wherein the flexible casing is made of metal, resin or composite thereof.
15. The flat aluminum electrolytic capacitor in accordance with claim 13 wherein the flexible casing is made of metal, resin or composite thereof.
16. The flat aluminum electrolytic capacitor in accordance with claim 7 wherein the outer casing has at least one of a plurality of openings stopped with a rubber sealant, the external lead-out terminals are in the form of film or foil, at least one lead terminal is provided for each external lead-out terminal, the lead terminal is integrated with the sealant, the flexible casing is made of metal, resin or composite thereof and the outer casing is made of metal or resin.