Johnston coupling with galvanic separation

摘要

A plug-in coupling for connecting a first to a second double-walled, vacuum-insulated cryogenic line is proposed. The plug-in coupling comprises a coupling plug and a coupling socket. The coupling plug has an inner and an outer pipe piece and a first attachment flange and is connected to the first cryogenic line. The coupling socket has an inner and an outer pipe piece and a second attachment flange and is connected to the second cryogenic line. On a distal end of the coupling plug, there is arranged a circular annular seal such that a sealed connection between the coupling socket and the coupling plug is formed when the coupling plug has been fully inserted into the coupling socket. The plug-in coupling is characterized in that (a) the seal on the distal end of the coupling plug is of electrically insulating form, (b) an insulating sleeve is arranged on the outer pipe piece of the coupling plug, and (c) an insulating disc is situated between the first and the second attachment flange when the coupling plug has been inserted into the coupling socket. The plug-in coupling realizes a galvanic is separation between the coupling plug and the coupling socket.