(57) An apparatus through which a fluid can flow under counter-pressure, such as a screw-type
compressor, comprising at least one male and one female rotor, having on the side
faces thereof enmeshing profilings, said rotors being rotatable in partially overlapping
cylindrical spaces disposed within the compressor housing, while the profilings of
the male rotor and of the female rotor have such a shape that when the two rotors
are rolling on each other in the common area of the cylinders, the bottom and walls
of the channel-shaped profiling of the female rotor are in contact with crests forming
part of the profiling of the male rotor, with formation of a linear seal.
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