Abstract: Systems and methods include providing an annular seal stack for an assembly. The seal stack assembly includes, at least one second annular seal, a spacer disposed axially adjacent to the at least one second annular seal, and a third annular seal disposed axially adjacent to the spacer. The seal stack assembly is disposed between a probe and a housing of the assembly and configured to provide an annular seal between the probe and the housing during operation of the assembly at cryogenic temperatures, during exposure of at least a portion of the seal stack assembly to cryogenic temperatures, during a change in pressure, during a change in temperature, or a combination thereof.

Abstract: A seal is provided for use with a tube coupling assembly. The tube coupling includes a male fitting having a beveled conical surface on the outside of its end and a female fitting having a beveled conical surface on the inside of its end. The selected angle for the bevels on both the male and female fittings in the same. The seal, which is interposed between the male and female bevel surfaces, comprises a seal body of spring material, such as Inconel 718, coated with a relatively soft metal, such as silver. The seal body and coating combination are configured to include a cylindrical skirt portion and a conical portion extending from the cylindrical skirt portion. The seal is mounted on the male fitting by means of an interference fit between the inner skirt surface and the outside cylindrical surface of the male fitting. The angle between the skirt and the outside surface of the seal's conical portion is different from the selected angle of the bevels on the male and female fittings.