Internal seal system for internal high pressure forming tool consists of radially expanding internal seal unit to separate high pressure chamber and support pressure chambers

摘要

An expanding internal seal unit (3) is protected during insertion into the tube etc. to be formed, and generates a sealing function by radial expansion. The inner wall of the tube is supported outside the high pressure chamber by flexible materials (4), or by one or more hydraulic pressure chambers (2) with reduced internal pressure. Support pressure chambers are separated from the high pressure chamber. Support pressure can be regulated independent of the required forming pressure.