A pressure converter (7) that comprises at least one pressure medium-operated converter cylinder (1) and at least one first converter valve (3) and that is adaptable to convert the pressure supplied to one or more external actuators (2) to the extent of the ratio of the surface areas of at least one converter cylinder (1). The pressure converter (7) also comprises means for controlling conversion and charging cycles of the pressure converter. The means comprise at least one moving part (8, 9, 12) in at least the converter cylinder, the moving part being adaptable to move in relation to the cylinder barrel(11) of the converter cylinder (1), and the position of the moving part (8, 9, 12) being adaptable to determine the control of the conversion and charging cycles of the pressure converter (7).
