Abstract: A system for storing potential energy includes a hydraulic cylinder, a mass to be lifted, and a sealing ring at the edge of the mass to be lifted. The mass to be lifted is a solid rock mass in the form of a cut-out solid rock. The hydraulic cylinder is formed by the cavity between surrounding rocks and the cut-out solid rock. The cavity is sealed with respect to the surrounding rocks by the sealing ring. A method for producing such a system is also provided.

Abstract: A jacket-assembly is sealed to a hydraulic elevator jack to protect the jack from corrosion. The jacket-assembly is preferably manufactured from a non-galvanic, non-corrosive material. The jacket may be manufactured from any non-galvanic, non-corrosive material that is strong enough and flexible enough to be factory-installed on the jack, i.e., installed on the jack at a location other than the location where the jack is to be installed, and survive shipping and installation of the jack. The jacket is preferably hermetically sealed to the jack. The jacket-assembly may contain a bulkhead mounted on the hydraulic elevator jack having an O-ring groove. An O-ring can be used to effect a hermetic seal between the bulkhead and the jacket. The bulkhead may be mounted on the jack with any conventional means. In one embodiment, a moisture sensor may be placed inside the jacket.

Abstract: A jacket-assembly is sealed to a hydraulic elevator jack to protect the jack from corrosion. The jacket-assembly is preferably manufactured from a non-galvanic, non-corrosive material, such as high density polyethylene tubing. The jacket may be manufactured from any non-galvanic, non-corrosive material that is strong enough and flexible enough to be factory-installed on the jack. The jacket is preferably hermetically sealed to the jack. The jacket-assembly may contain a bulkhead mounted on the hydraulic elevator jack having an O-ring groove. An O-ring can be used to effect a hermetic seal between the bulkhead and the jacket. The bulkhead may be mounted on the jack with any conventional means, such as a weld. In one embodiment, a moisture sensor may be placed inside the jacket.

Abstract: A hydrostatic radial piston engine with two rotors that are supported on an axle so that they can rotate easily thereon. The rotors have a plurality of radial bores with displacement elements (pistons with slide ring) therein, sliding on the inside of a piston ring. The bores are connected via control slits with transport channels (high-pressure/low-pressure) that open on a side on the rotors for the purpose of controlling the transport of the pressure medium. The two rotors can be rotated easily on the axle which mounted on an intermediate bottom. The intermediate bottom is disposed between the rotors. Check plates are disposed on the ends of the axle which take up the axial forces produced by the pressure medium in the control slits of the rotors. The piston rings are supported in the intermediate bottom by a common connecting shaft.

Abstract: A method of reducing seal stiction in a hydraulic cylinder is provided comprising the steps of providing a hydraulic cylinder, having a housing, a piston, and a seal, providing apparatus for rotating the seal about the piston, and rotating the seal about the axis of the piston at the same time as the piston begins to axially displace.

Abstract: A relief valve for the hydraulic fuse minimizes the chance of a device such as a hydraulically powered lift device from collapsing upon a break in a hydraulic input line to a cylinder powering the lift. The relief valve comprises a valve seat biased in a first direction by a relatively heavy spring and a hydraulic fuse biased away from the valve seat by a relatively light, second spring. Upon a break occurring in the hydraulic input line, back pressure urges the fuse to seat against the valve seat, thus closing the valve. Upon applying additional hydraulic pressure in the direction of the fuse, the valve seat disengages from the fuse, allowing hydraulic fluid to flow through the relief valve and thus allowing a piston in the hydraulic cylinder to retract so as to permit lowering of the lift device.

Abstract: An improved valve actuator is provided for employment in environments such as subterranean wells where highly corrosive gases and fluids are contained in the well fluid which is normally pressurized and employed to operate the actuator. The bias element opposing the pressure induced movements of the piston unit of the actuator is disposed in an isolation chamber defined between two axially spaced, radial shoulders provided on the piston and having sealing engagement with the bore of the cylindrical wall, thus defining constant volume annular chamber that is isolated from the highly corrosive fluids and gases. The isolated chamber moves with the piston and thus does not provide fluid pressure opposition to the fluid pressure induced movement of the piston.

Abstract: A shipping assembly for a hydraulic jack in which the cylinder of the jack is shipped in sections. First and second shipping caps are fastened to predetermined ends of the cylinder sections during shipment, with the first shipping cap utilizing certain of the same cylinder joint fastening hardware which will subsequently be used to join the cylinder sections at the job site. The first and second shipping caps are cooperatively configured to enable them to be assembled into a complete, self-contained shipping package for return to the factory, using the fastening hardware used to secure the second shipping cap to a cylinder section.