BLADDER TYPE HYDRAULIC EXPANDER

摘要

TITLE BLADDER TYPE HYDRAULIC EXPANDER INVENTORS J.A. Aikin D.A. Scott A tube expanding device which makes use of very high fluid pressure to expand the tube while isolating the fluid from the tube. The tube expander comprises a two piece mandrel having sealing rings adjacent each end and a tubular bladder which slides over the mandrel in sealing engagement with the sealing rings. The bladder is retained in position on the mandrel by shoulders adjacent the sealing rings. Fluid to expand the bladder is supplied through an inlet in the mandrel which connects with a radial passage.