Expanding lance for partially expanding a tubular hollow profile has a first axial channel and a second axial channel with a radial bore opening on the casing of a sealing support between two sealing rings of a sealing arrangement

摘要

Expanding lance (1) has a first axial channel (17) and a second axial channel (19) with a radial bore (20) opening on the casing (25) of a sealing support (2) between two sealing rings (7, 8) of a sealing arrangement (5, 6) leading to an expanding site. Several transverse openings branching from the axial channel open between sealing rings displaced in the peripheral direction. Preferred Features: The axial channels (17, 19) have different cross-sections and are connected to each other via a transverse channel containing a blocking valve.