Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1993-07-27
1996-07-23
Cuchlinski, Jr., William A.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277106, 277115, 277117, 277205, F16J 1510
Patent
active
055382568
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
A method for producing a packing arrangement for a hydraulically operated apparatus and a packing arrangement.
The present invention relates to a new method for producing a packing arrangement for a hydraulically operated apparatus and a packing arrangement. The invention relates especially to spring energized seals for different pressurized apparatuses.
BACKGROUND OF THE INVENTION
The new method and packing arrangement is essentially meant for producing a packing arrangement, which compensates for the wear and volume changes of seal material and of the cylinder, in which the said seal is moving axially and/or radially against metal surfaces to be sealed.
Accordingly an object of this invention is to provide a simple method for producing a packing arrangement for purposes, in which an elastic seal material, preferably PTFE compound, is compressed to its final shape at room temperature by means of press members made of steel, the press members being movable against each other by force to compress said seal material placed therebetween, thus forming an elastic seal material layer for sealing a gap between surfaces to be sealed, and which the packing arrangement is capable of compensating the temperature changes and the wear of seal material.
Another object of the invention is to provide an adjustable packing arrangement, particularly for a hydraulic fluid operated or mechanically operated system, which the arrangement is capable of withstanding substantial high pressures, even pressures of several hundred bars in a wide temperature range, but being suitable for minor pressures as well.
Still another object of the present invention is to provide a packing arrangement that is displaceable in an axial direction inside a cylindrical/tubular space, said packing arrangement being also suitable for the axially surrounding sealing of a shaft which is rotatable and/or axially displaceable within said space.
Still another object of the invention is to provide a relatively simple and effective packing arrangement for packing or sealing cylindrical/tubular spaces or shafts operating in such spaces, especially when applying relatively high operating pressures.
A packing arrangement of the invention finds a plurality of applications in mechanical seal components having considerable pressure differences on both sides to be sealed, e.g., flap-valves, ball valves, pistons etc. This type of seal and packing arrangement also can be used in any geometrical form of pistons and cylinders, which are used for seal arrangements on various designs in a machine construction.
To achieve the above and other objects of the invention, there is provided a method for producing a packing arrangement for a hydraulically operated apparatus, said method being characterized by the following steps: and in said cylinder between a piston member and a counterpress member, at least one of said piston member and counterpress member being provided with rounded or tapered head portion facing against said preshaped piece, whereby the cross-section of said final compressed seal member is essentially wedge-shaped.
There is also provided a packing arrangement displaceable in an axial direction inside a cylinder/tubular space, characterized in that said packing arrangement includes: two metallic compression elements axially displaceable relative to each other, whose relative rotation is prevented, and a seal member, fitted between compression elements and cold-molded at room temperature from a blank and whose material comprises quite easily plastically moldable materials with a low friction coefficient, especially PTFE plastics in various compounds, or graphite, said cold-molding being effected by means of said compression elements in a cylinder/tubular space, said space serving as a final operating location for the packing arrangement or corresponding in its dimensions to a final operating location for the packing arrangement; that a molding surface included in at least one of the compression elements and positioned against seal m
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WO8001306 Int'l Appln. (International Search Report) DE 1 675 571; Published Jan. 1, 1971. DE 2 304 965; Published Aug. 22, 1974 (International Search Report) GB 1 496 986; Published Jan. 5, 1978.
1342707 Pub: Jan. 3, 1974, Great Britain PCT International Search Report.
Beres John L.
Cuchlinski Jr. William A.
Unicraft Oy
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