Abstract: In a screw compressor, an axial force is transmitted from the rotor shaft to the housing by way of an antifriction bearing including first and second bearing rings and roll bodies therebetween, the first ring being mounted on the shaft while the second ring is supported axially by the housing and is movable radially relative to the housing. A piston mounted concentrically on the shaft is operable by a fluid pressure to decrease the axial force transmitted to the housing, and the piston sealingly cooperates with a surface which is stationary relative to the second bearing ring.

Abstract: A tubular element of a connecting device is mounted for displacement between an extended position, where it seals against a mobile container around an opening therein for passage of conditioning air, and a retracted position where it is spaced from the container and where the connecting device is entirely retracted from said opening. A valve arrangement of the connecting device includes a body disposed coaxially of the tubular element and forming therewith a passage for the air flow which is opened when said element moves toward its extended position and which is closed when said element moves toward its retracted position.