Patent ID: 7275373

Claim:
A reciprocating piston device for the closure of a vessel and consisting of at least one base element and one closure element, said system encompassing at least one movable piston ( 1 ) each of the at least one movable pistons with one hydraulic cylinder ( 7 ), and at least one movable intensifier piston ( 2 ) each of the at least one intensifier pistons with one intensifier cylinder ( 8 ), all of which are rotationally symmetrical, each hydraulic piston ( 1 ) and its hydraulic cylinder ( 7 ) and each intensifier piston ( 2 ) and its intensifier cylinder ( 8 ) being arranged along an axis of rotation, each hydraulic piston ( 1 ) featuring on the piston end located in the hydraulic cylinder ( 7 ) at least one circumferential reinforcement running radially on its outer surface, with an internal space between the hydraulic cylinder ( 7 ) and the hydraulic piston ( 1 ) divided into not less than two subsidiary spaces ( 3 and 5 ) not less than one bore ( 10 and 11 ) in each hydraulic cylinder ( 7 ) leading to each of these subsidiary spaces, the cylinder ( 1 ) being driven water-hydraulically and the intensifier piston ( 2 ) pneumatically, wherein the hydraulic piston ( 1 ) and intensifier piston ( 2 ) are incorporated into a direct axial function in relation to the axis of rotation, via the fluid located in space ( 3 ) between a lower face ( 19 ) of each piston ( 1 ) and an upper face ( 18 ) of each intensifier piston ( 2 ), the upper face of hydraulic piston ( 1 ) forming at least part of the closure of a vessel ( 9 ) or being rigidly connected to the closure part of the vessel ( 9 ), and the closure part essentially moves along the axis of rotation in relation to the hydraulic piston ( 2 ), and the vessel ( 9 ) is arranged opposite the upper face of the hydraulic piston ( 1 ), and at least one sliding surfaces ( 13 to 16 ) located on the internal surfaces of the cylinders and on the piston surfaces in the zones in which the cylinder and piston surfaces are located opposed to one another and in contact and move relative to one another parallel to the axis of rotation, shows a support ratio of >60%, said ratio representing the proportion of “peaks” to the “valleys” of the surface structure, and the reciprocating piston system is open with regard to the feed and discharge of the operating fluid.