Operating engine

A working engine comprising:

• at least one double cylinder;
• a respective double piston that is movable within the at least one double cylinder;
• a respective primary working volume defined by the at least one double cylinder and the respective double piston;
• a respective secondary working volume defined by the at least one double cylinder and the respective double piston, wherein the respective secondary working volume is connected to at least one working volume of a group of co-operating cylinders of an operating engine via a main line;
• at least one inlet valve associated with the respective primary working volume;
• and
• at least one outlet valve associated with the respective primary working volume;
• wherein the at least one inlet valve is connected to a supply line arrangement that a medium is fed therethrough;
• wherein the at least one inlet valve is arranged such that when the at least one inlet valve is open, the medium is supplied to the associated respective primary working volume;
• wherein the at least one outlet valve comprises a respective discharge line arrangement that the medium is dischargeable therethrough;
• wherein the at least one outlet valve is arranged such that when the at least one outlet valve is open the medium from the respective at least one primary working volume is discharged via the discharge line arrangement;
• wherein when the at least one inlet valve and the at least one outlet valve are in a first working phase to increase the respective primary working volume and increase the at least one working volume of the group of co-operating cylinders, the at least one inlet valve is open and the at least one outlet valve is closed;
• wherein when the at least one inlet valve and the at least one outlet valve are in a second working phase to reduce the respective primary working volume and reduce the at least one working volume of the group of co-operating cylinders, the at least one outlet valve is open and the at least one inlet valve is closed;
• wherein a drive energy results from a pressure caused by the medium flowing into the respective primary working volume via the at least one inlet valve;
• wherein the respective double piston includes a double piston head and a double piston rod;
• wherein a first end of the double piston rod is connected to the double piston head, and a second end of the double piston rod has an opening;
• wherein the respective double piston, the double piston head, and the double piston rod are hollow;
• wherein the double piston head is sealed against a cylinder wall of the at least one double cylinders;
• wherein the second end of the double piston rod is sealed against the cylinder wall of the at least one double cylinder;
• wherein the medium flows into the respective double piston when the at least one inlet valve is open;
• wherein the medium is pressed out of the respective double piston when the at least one outlet valve is open;
• and
• wherein the respective double piston comprises at least one air ventilation opening.