| 摘要 |
A metallic press fitting element is made from a solid or hollow bar as starting material which is treated by a machining process, or by a machining process and a subsequent non-cutting process, to form a finished press fitting element with a pressing zone destined for connection of a pipe. The pressing zone is comprised of a hook-shaped region of substantially roof-shaped cross section for receiving an O-ring gasket, and an adjacent cylindrical region positioned inwardly of the hook-shaped region distal to an insertion end for the pipe into the pressing zone. The pressing zone is so machined or, as an alternative, machined and subsequent non-cutting procedure as to have a shape and wall thickness in correspondence to a pressing zone of a sheet metal press fitting element that has been cold press formed, so that the finished press fitting element is plastically deformable to realize a non-detachable and tight connection between the finished press fitting element and the pipe upon attachment of a pressing tool, which includes at least two clamping jaws, and closing of the jaws of the pressing tool, whereby during pressing action, the jaws of the pressing tool so act upon the hook-shaped region with received O-ring gasket as well as upon the cylindrical region of the pressing zone that the apex of the hook-shaped region is diametrically reduced and areas adjacent to the apex of the hook-shaped region are pushed toward one another.
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