Abstract: A valve housing is cooled to minimize any temperature gain by the fluid being controlled. The valve member is moved by an actuator toward and away from a seat to control flow through the housing. The valve member and its stem are made from a heat conductive material. The valve member and its stem are cooled by conduction when the valve member is in an open or closed position.

Abstract: A cryogenic fluid transfer line is provided which comprises an interior conduit for passage therethrough of cryogenic fluid, an exterior conduit concentrically spaced about the interior conduit and defining the exterior of the fluid transfer line, an annular heat transfer shield generally concentric with and interjacent to the interior and exterior conduits and including at least one longitudinally extending resilient arcuate member with a longitudinally extending generally arcuate hooking edge, at least one longitudinally extending resilient arcuate member with a longitudinally extending generally arcuate catching edge, where the hooking and catching edge members are interlockingly engageable with each other when the member including the hooking edge is flexed to a smaller arcuate radius, positioned with its hooking edge inboard of the catching edge and then permitted to relax, each set of engaged hooking and catching edges defining a hollow generally cylindrical nest having a substantially closed curved sur