Low-temperature conduit coupling

A conduit coupling for connecting a first conduit to a second conduit to open or block a medium passage for low temperature media, comprising:

• a first coupling half arranged in a course of a first conduit, which comprises a first tubular housing with an outer coupling groove, and a poppet valve with a spring biased valve disk that normally blocks a medium passage but can be pushed open;
• a second coupling half arranged in a course of a second conduit, which comprises a second, three-part housing including a tubular jacket housing, a bell-shaped drive housing and a valve housing, and a stem-actuated valve including a valve stem and a valve piston that normally blocks said medium passage through an axial annular gap on the valve housing but clears said medium passage when being displaced by the drive housing, wherein the drive housing can take different rotational positions in order to engage and disengage coupling pins in the coupling groove and to rotate a cam groove to thereby drive a stem pin of the valve stem and the valve stem to open or close the stem-actuated valve, and to actuate the poppet valve of the first coupling half;
• and
• a first spreading lip seal which, as an element of the valve piston, opens or closes the axial annular gap between the valve housing and the valve stem depending on the position of the drive housing.