A pressure converter that comprises at least one pressure medium-operated converter cylinder and at least one first converter valve and that is adaptable to convert the pressure supplied to one or more external actuators to the extent of the ratio of the surface areas of at least one converter cylinder, wherein the pressure converter further comprises means for controlling conversion and charging cycles of the pressure converter, which means comprise at least one moving part (8, 9, 12) in at least the conversion cylinder, the moving part being adapted to move in relation to the cylinder barrel of the converter cylinder and the position of the moving part (8, 9, 12) being adaptable to determine the control of the conversion and charging cycle of the pressure converter; wherein said first converter valve comprises a sequence valve, or at least one pressure release valve with one or more separate check valves connected in parallel thereto; characterised in that the pressure converter is connectable to exactly one pressure line, whereby the pressure converter comprises exactly one input channel and one output channel; wherein a conversion cycle of the pressure converter, in which the pressure and/or volume flow supplied to at least one actuator is converted to the extent of the ratio of the surface areas of said at least one converter cylinder is initiated in response to said at least one moving part (8, 9, 12) of the converter cylinder reaching a position in relation to the cylinder barrel of the converter cylinder, which position switches on the initiation of the conversion cycle, and wherein a charging cycle of the pressure converter, in which the piston of the converter cylinder is returned to a position from which the next conversion cycle can be started at the beginning of the work movement of the actuator, is ended in response to said at least one moving part (8, 9, 12) of the converter cylinder reaching a position in relation to the cylinder barrel of the converter cylinder, which position switches on the ending of the charging cycle. wherein the pressure converter further comprises means for controlling conversion and charging cycles of the pressure converter, which means comprise at least one moving part (8, 9, 12) in at least the conversion cylinder, the moving part being adapted to move in relation to the cylinder barrel of the converter cylinder and the position of the moving part (8, 9, 12) being adaptable to determine the control of the conversion and charging cycle of the pressure converter; wherein said first converter valve comprises a sequence valve, or at least one pressure release valve with one or more separate check valves connected in parallel thereto; characterised in that the pressure converter is connectable to exactly one pressure line, whereby the pressure converter comprises exactly one input channel and one output channel; wherein a conversion cycle of the pressure converter, in which the pressure and/or volume flow supplied to at least one actuator is converted to the extent of the ratio of the surface areas of said at least one converter cylinder is initiated in response to said at least one moving part (8, 9, 12) of the converter cylinder reaching a position in relation to the cylinder barrel of the converter cylinder, which position switches on the initiation of the conversion cycle, and wherein a charging cycle of the pressure converter, in which the piston of the converter cylinder is returned to a position from which the next conversion cycle can be started at the beginning of the work movement of the actuator, is ended in response to said at least one moving part (8, 9, 12) of the converter cylinder reaching a position in relation to the cylinder barrel of the converter cylinder, which position switches on the ending of the charging cycle.