Sealing device for a piston rod of a reciprocating compressor

Reciprocating piston compressor comprising a number of cylinders, in each of which cylinders a piston is arranged, that is movable in a reciprocating manner, wherein each piston is connected to a piston rod, wherein for at least one cylinder of the number of cylinders, a sealing device is provided for sealing a respective piston rod, the sealing device comprising a first axial device end, configured to face toward a cylinder of the compressor, and an opposite second axial device end, configured to face toward a crankcase of the compressor, a number of first packing retainers, each retainer including a retaining opening in which one of a number of first packing rings is arranged, a second packing retainer, including a retaining opening in which a second packing ring is arranged, the second retainer being positioned closer to the second axial device end than the number of first packing retainers in an axial direction of the sealing device, wherein the second packing ring is an uncut ring, comprising a continuous inner circumferential sealing surface, the second packing ring being configured to seal the piston rod at standstill of the compressor, wherein the sealing device further comprises a support passage having a first support passage end, a second support passage end and a valve for opening and closing the support passage, the support passage being configured to vent a gas, leaking from the first axial device end in the direction of the second axial device end past at least one of the number of first packing rings, from the first support passage end to the second support passage end, wherein the sealing device further comprises an unobstructed vent passage having a first vent passage end and a second vent passage end, the vent passage being configured to vent a gas, leaking from the first axial device end in the direction of the second axial device end past the second packing ring, from the first vent passage end to the second vent passage end.