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A shutter valve for alternatingly allowing and stopping a high pressure water flow, such as in a device for generating energy from sea waves, comprising a tube section (201) having a rectangular cross section, wherein a multitude of vanes (202) are rotatably mounted in the tube section (201), wherei

A shutter valve for alternatingly allowing and stopping a high pressure water flow, such as in a device for generating energy from sea waves, comprising a tube section (201) having a rectangular cross section, wherein a multitude of vanes (202) are rotatably mounted in the tube section (201), wherein the vanes have a relatively large rectangular longitudinal cross section in a first direction, a relatively flat rectangular longitudinal cross section in a second direction perpendicular to said first direction, and a generally flat cross section in a third direction perpendicular to said first and second directions, said third direction being the axis of the vane (202), wherein the circumferential wall around the axis of each vane forms a closed water impermeable surface, wherein the axes of said multitude of vanes all extend in a parallel manner, characterized in that the distances between the axes of adjacent vanes are approximately half the distance between the outer tips of the vanes, seen in the cross section in said third direction, such that when the vanes are rotated to the closed position the lower half of the front surfaces and upper half of the back surfaces of all vanes form a single closed front surface and a single closed back surface, each in substantially a single flat plane perpendicular to the flow axis of the valve, said surfaces closing the opening of said tube section, and the other half of said front surfaces and the other half of said back surfaces of said vanes rest against each other.

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1. A device for generating energy from sea waves, comprising: a float for following the movement of sea waves; anda pump chamber having a variable volume for holding a variable volume of water, said pump chamber volume being arranged to change by the force exerted by said moving float,wherein said p

1. A device for generating energy from sea waves, comprising: a float for following the movement of sea waves; anda pump chamber having a variable volume for holding a variable volume of water, said pump chamber volume being arranged to change by the force exerted by said moving float,wherein said pump chamber comprises a water supply tube 4 and a water discharge tube, wherein said supply tube and said discharge tube are each provided with a valve, wherein said valves are arranged to close and open in alternating fashion with a cycle frequency equal to the cycle frequency of the sea waves,wherein at least one of the valves is a shutter valve comprising a tube section having a rectangular cross section,wherein a multitude of vanes are rotatably mounted in the tube section, said multitude of vanes having a relatively large rectangular longitudinal cross section in a first direction, a relatively flat rectangular longitudinal cross section in a second direction perpendicular to said first direction, and a generally flat cross section in a third direction perpendicular to said first and second directions, said third direction being the axis of the vane,wherein a circumferential wall around the axis of each vane forms a closed water impermeable surface,wherein the axes of said multitude of vanes all extend in a parallel manner, andwherein the distances between the axes of adjacent vanes are approximately half the distance between the outer tips of the vanes, seen in the cross section in said third direction, such that when the vanes are rotated to the closed position the lower half of the front surfaces and upper half of the back surfaces of all vanes form a single closed front surface and a single closed back surface, each in substantially a single flat plane perpendicular to the flow axis of the valve, said surfaces closing the opening of said tube section, and the other half of said front surfaces and the other half of said back surfaces of said vanes rest against each other. 2. The device in accordance with claim 1, wherein the vanes have a generally flat-rhombic cross section in a third direction perpendicular to said first and second directions. 3. The device in accordance with claim 1, wherein at the sides next to the two outer vanes, the tips of the vanes rest against matching ridges extending from the inner wall of the tube section. 4. The device in accordance with claim 1, wherein at the outer ends of the vanes shaft ends extend from the vanes along the axis of the vanes, said shaft ends extending through holes in said tube section. 5. The device in accordance with claim 4, wherein the array of vanes can be rotated by means of a rack mating with pinions attached to the shaft ends on at least one outer side of the tube section. 6. The device in accordance with claim 5, wherein the rack is arranged to be moved by a hydraulic cylinder. 7. The device in accordance with claim 6, wherein cylinder is controlled by a hydraulic Moog valve. 8. A shutter valve for alternatingly allowing and stopping a high pressure water flow, comprising a tube section having a rectangular cross section, wherein a multitude of vanes are rotatably mounted in the tube section, the vanes having a relatively large rectangular longitudinal cross section in a first direction, a relatively flat rectangular longitudinal cross section in a second direction perpendicular to said first direction, and a generally flat cross section in a third direction perpendicular to said first and second directions, said third direction being the axis of the vane, wherein a circumferential wall around the axis of each vane forms a closed water impermeable surface,wherein the axes of said multitude of vanes all extend in a parallel manner, andwherein the distances between the axes of adjacent vanes are approximately half the distance between the outer tips of the vanes, seen in the cross section in said third direction, such that when the vanes are rotated to the closed position the lower half of the front surfaces and upper half of the back surfaces of all vanes form a single closed front surface and a single closed back surface, each in substantially a single flat plane perpendicular to the flow axis of the valve, said surfaces closing the opening of said tube section, and the other half of said front surfaces and the other half of said back surfaces of said vanes rest against each other. 9. The shutter valve in accordance with claim 8, wherein the vanes have a generally flat-rhombic cross section in a third direction perpendicular to said first and second directions. 10. The shutter valve in accordance with claim 8, wherein at the sides next to the two outer vanes, the tips of the vanes rest against matching ridges extending from the inner wall of the tube section. 11. The shutter valve in accordance with claim 8, wherein at the outer ends of the vanes shaft ends extend from the vanes along the axis of the vanes, said shaft ends extending through holes in said tube section. 12. The shutter valve in accordance with claim 11, wherein the array of vanes can be rotated by means of a rack mating with pinions attached to the shaft ends on at least one outer side of the tube section. 13. The shutter valve in accordance with claim 12, wherein the rack is arranged to be moved by a hydraulic cylinder. 14. The shutter valve in accordance with claim 13, wherein the cylinder is controlled by a hydraulic Moog valve.