Mannesmann Aktiengesellschaft

Thomas Gigowski

Herbert Foering

Johannes Schurr

Karl-Heinz Hartings

Michael Berane

Friedrich Lenze

Erich Quadflieg

Christoph Bunsen

Rainer Franzen

Martin Schluter

A press fitting for producing a nondetachable tight connection of smooth-ended pipes which has at least one portion receiving a toroidal sealing element and an adjoining cylindrical area extending in the longitudinal direction, and is provided with a shoulder acting as a stop for the pipe which can be pushed in or pushed on. The sealing element has, in the circumferential direction, at least one portion which is provided with a cross section diverging from the starting cross section in that a bulge extends along the circumference and along the cross-sectional plane and a recess facing the pushed in pipe extends radially in the cross section of the sealing element, the volume of the bulge compared with the starting cross section is at least equal to the volume of the recess lacking at the starting cross section and, before pressing, the recess of the sealing element forms a through-opening in the axial direction viewed in cross section.

Press-fitting for non removable tube coupling

A pipe coupling with a cylindrical pipe, whose smooth end section can be inserted into a fitting that has at least one sleeve-like area extending in the longitudinal direction. At least one sealing ring is arranged between the pipe outer wall and the fitting inner wall. The fitting and the pipe are connected securely to each other by an externally applied pressing tool that acts in a plastically deforming manner on at least one radial plane of the sleeve-like area of the fitting as well as the pipe section located under this. A metal sleeve, which can be placed over the pipe ends by force, is arranged between the pipe outer wall and the fitting inner wall. The fixed axial extension of the metal sleeve surrounds the pipe starting from the pipe end face, and the length of the metal sleeve is selected so as to correspond to the required overlap between the pipe and the fitting. This required overlap is attained when, after placement of the fitting onto the metal sleeve, or after insertion of the pipe and the metal sleeve into the fitting, the end face of the fitting facing the pipe coincides exactly with the end of the metal sleeve, and the sealing ring, seen in cross-section, is penetrated by the metal sleeve.

Pipe coupling

Pipe joint

Growing community of inventors

Grevenbroich, Germany

Thomas Gigowski