Presently disclosed self-regulating thermal insulation may include one or more thermal actuators that may expand and contract in response to changes in temperature adjacent the thermal insulation, thereby automatically changing the thermal resistance of the thermal insulation. In this manner, a self-regulating thermal insulation may be configured to locally adjust in response to local changes in temperature of a part being insulated, for example, during curing or some other manufacturing process. Such self-regulating thermal insulation may be configured to respond to temperature changes without feedback control systems, power, or human intervention. One example of self-regulating thermal insulation may include a first plate, a second plate, a support structure coupling the first plate and the second plate and defining an insulation thickness therebetween, an internal partition positioned between the first plate and the second plate, and at least one thermal actuator positioned between the second plate and the internal partition.

A duct joint assembly between a first section and a second section, each section consisting of an inner tube and an outer tube, the outer tube surrounding the inner tube, and between which a heat insulaton is placed. Each section has a fastening body so that the sections can be assembled to, or disassembled from, each other.

A flexible joint assembly is disclosed for use in an extreme temperature fluid flow system. In an embodiment, the flexible joint assembly can be used in a fluid flow system configured to carry high temperature fluid, such air or other gas, and/or in a fluid flow system configured to carry low temperature fluid, such air or other gas.

A heat insulation pipe includes an inner pipe and an outer pipe. The inner pipe includes a pair of inner pipe members spaced apart from each other in an axial direction of the inner pipe, a first bellows disposed between the pair of inner pipe members, and a restriction mechanism for restricting expansion and contraction of the inner pipe in the axial direction to a predetermined range. The restriction mechanism is slidable with respect to at least one of a pair of bulging portions. The outer pipe includes a pair of outer pipe members each including a second bellows, and a second cylindrical portion housing the first bellows and the restriction mechanism.

A heat insulation pipe includes an inner pipe and an outer pipe. The inner pipe includes a pair of inner pipe members spaced apart from each other in an axial direction of the inner pipe, a first bellows disposed between the pair of inner pipe members, and a restriction mechanism for restricting expansion and contraction of the inner pipe in the axial direction to a predetermined range. The restriction mechanism is slidable with respect to at least one of a pair of bulging portions. The outer pipe includes a pair of outer pipe members each including a second bellows, and a second cylindrical portion housing the first bellows and the restriction mechanism.