Coupling for cryogenic conduits

A coupling (1, 1′) for cryogenic lines, the coupling comprising:

• a coupling socket (3) and a coupling plug (2);
• the coupling plug (2) has a first inner, media-carrying pipeline element (13) and a first outer pipeline element (14) which surrounds the first inner pipeline element (13) coaxially at a radial distance, with an evacuable first free space (56) formed between the first inner, media-carrying pipeline element (13) and the first outer pipeline element (14);
• the coupling socket (3) has a second inner pipeline element (23, 29) and a second outer pipeline element (24) which surrounds the second inner pipeline element (23, 29) coaxially at a radial distance, with an evacuable second free space (55) formed between the second inner pipeline element (23, 29) and the second outer pipeline element (24);
• the first inner pipeline element (13) is detachably connected or connectable to the second inner pipeline element (23, 29);
• the first outer pipeline element (14) is detachably connected or connectable to the second outer pipeline element (24);
• a drive element (4, 36;
• 48) which is connected or connectable to the coupling plug (2) and which has a first engagement structure which is complementary to a second engagement structure on the coupling socket (3) or on the coupling plug (2);
• wherein, after the first engagement structure and the second engagement structure have been engaged, a rotational movement exerted on the drive element (4, 36;
• 48) from outside about a common longitudinal axis (L) of the pipeline elements (13, 14, 23, 24), effects an axial relative movement of the coupling plug (2) and the coupling socket (3) such that a fluid-tight connection is or is adapted be created between the first inner pipeline element (13) and the second inner pipeline element (23, 29).