Abstract: The invention provides a pipe expanding apparatus of a thin wall stainless steel pipe in which a strain is not generated in a flange and a yoke, even when a pipe expanding rubber swells. The invention includes a flange which forms one inclined surface of a chevron shaped projection portion by internally fitting a thin wall stainless steel pipe, a yoke which forms the other inclined surface of the chevron shaped projection portion by being coupled at its one end side to the flange, and is coupled to a cylinder at its other end side, a guide rod which is coupled to a piston of the cylinder, and a pipe expanding rubber which is pinched between a step portion of the guide rod and a backup ring and expands the thin wall stainless steel pipe.

Abstract: A connection structure includes a thin wall stainless steel pipe with a swelling portion, a sandwiching portion forming an inclined pressing surface capable of pressing an inclined surface of the swelling portion, a joint spacer forming a first retention portion pinching a first gasket with respect to the swelling portion as well as having a fitting portion fitted to an outer periphery of an end portion of the thin wall stainless steel pipe, and forming a gasket receiving portion in an outer peripheral side thereof, and a joint having a second retention portion sandwiching and pressing a second gasket to an inner peripheral side facing the gasket receiving portion.

Abstract: A connection structure includes a thin wall stainless steel pipe in which a swelling portion, a sandwiching portion forming an inclined pressing surface capable of pressing one inclined surface of the swelling portion, a joint spacer forming a first retention portion pinching a first gasket with respect to the swelling portion as well as having a fitting portion fitted to an outer periphery of the end portion of the thin wall stainless steel pipe, and forming a gasket receiving portion in an outer peripheral side thereof, a joint having a second retention portion sandwiching and pressing a second gasket to an inner peripheral side facing the gasket receiving portion.

Abstract: The invention provides a pipe expanding apparatus of a thin wall stainless steel pipe in which a strain is not generated in a flange and a yoke, even when a pipe expanding rubber swells. The invention includes a flange which forms one inclined surface of a chevron shaped projection portion by internally fitting a thin wall stainless steel pipe, a yoke which forms the other inclined surface of the chevron shaped projection portion by being coupled at its one end side to the flange, and is coupled to a cylinder at its other end side, a guide rod which is coupled to a piston of the cylinder, and a pipe expanding rubber which is pinched between a step portion of the guide rod and a backup ring and expands the thin wall stainless steel pipe.