Dummy piston compressor with

It is a compressor, described as having a slidable in the piston chamber, functioning as the piston fluid. (3) According to the invention arranged with it a movable piston dummy (5) in the liquid. This dummy piston (5) is preferably designed such that it causes an acceleration of the liquid (3) in the space defined by it and the piston chamber wall annular gap at the top dead center.