Piston-type accumulator, having: a pressure vessel which is made up of a first main body with a substantially ring-shaped cross section and of a first cover and of a second cover, which covers close off the main body at its opposite ends; a cylinder which is arranged within the pressure vessel and which is made up of a second main body with a substantially ring-shaped cross section and of a third cover which closes off the second main body at one end thereof; an intermediate space which is formed between the pressure vessel and the cylinder, which intermediate space comprises a ring-shaped chamber which surrounds a cylinder along a longitudinal axis of the cylinder and which intermediate space furthermore comprises a first space in the region of the first cover and a second space in the region of the second cover; a separating piston which is provided movably in the cylinder, wherein a hydraulic fluid acts on a first side of the separating piston and a gas acts on a second side of the separating piston; wherein the hydraulic fluid is situated in a first space which is delimited by the second main body, by the third cover and by a first face side of the separating piston, and wherein the hydraulic fluid can be supplied to the first space and discharged from the first space via a port which is led through the third cover and through the first cover; and wherein the gas is situated in a second space which is delimited by a second face side, situated opposite the first face side, of the separating piston and by the second main body, wherein the second space is connected to the intermediate space via an opening such that the gas is fluidically connected to the intermediate space. a pressure vessel which is made up of a first main body with a substantially ring-shaped cross section and of a first cover and of a second cover, which covers close off the main body at its opposite ends; a cylinder which is arranged within the pressure vessel and which is made up of a second main body with a substantially ring-shaped cross section and of a third cover which closes off the second main body at one end thereof; an intermediate space which is formed between the pressure vessel and the cylinder, which intermediate space comprises a ring-shaped chamber which surrounds a cylinder along a longitudinal axis of the cylinder and which intermediate space furthermore comprises a first space in the region of the first cover and a second space in the region of the second cover; a separating piston which is provided movably in the cylinder, wherein a hydraulic fluid acts on a first side of the separating piston and a gas acts on a second side of the separating piston; wherein the hydraulic fluid is situated in a first space which is delimited by the second main body, by the third cover and by a first face side of the separating piston, and wherein the hydraulic fluid can be supplied to the first space and discharged from the first space via a port which is led through the third cover and through the first cover; and wherein the gas is situated in a second space which is delimited by a second face side, situated opposite the first face side, of the separating piston and by the second main body, wherein the second space is connected to the intermediate space via an opening such that the gas is fluidically connected to the intermediate space.