A press cylinder for an extrusion press having a cylinder beam has a
cylinder housing fixed on the beam and a piston shiftable along an axis
in opposite forward and rearward directions in the housing and defining
with a rear end of the housing a pressurizable cylinder chamber. A rod
projecting axially rearwardly through the rear wall of the housing is
formed with an axially extending bore. A connection block is fixed on the
housing rearward of the piston. An axially extending tube in the bore
fixed to the block is surrounded by an axially extending sleeve forming
with the tube an annular gap, forming with an inner surface of the bore
an annular compartment, and also fixed to the block. This is formed with
respective passages opening into the tube and into the annular gap.