Abstract: The invention concerns a compression device fitted with a drive unit; with a compressor driven by the drive unit, which compresses a gaseous compression medium; with a cooling device, comprising at least one fan wheel, which cools the compression medium; the fan wheel is in drive connection with the drive unit or a second drive unit additionally provided, in order to be thereby driven in rotation. The invention is characterized in that a hydrodynamic clutch is arranged in the drive connection, via which the fan wheel is driven hydrodynamically, and the drive power transmission of the hydrodynamic clutch can be modified in operation by pressurizing the hydrodynamic clutch with a control pressure medium, wherein the compression medium is the control pressure medium at the same time.

Abstract: The invention concerns a compression device fitted with a drive unit; with a compressor driven by the drive unit, which compresses a gaseous compression medium; with a cooling device, comprising at least one fan wheel, which cools the compression medium; the fan wheel is in drive connection with the drive unit or a second drive unit additionally provided, in order to be thereby driven in rotation. The invention is characterised in that a hydrodynamic clutch is arranged in the drive connection, via which the fan wheel is driven hydrodynamically, and the drive power transmission of the hydrodynamic clutch can be modified in operation by pressurising the hydrodynamic clutch with a control pressure medium, wherein the compression medium is the control pressure medium at the same time.

Abstract: A centrifugally balanced fluid reservoir comprising a fluid reservoir having a channel therein, a flexible barrier dividing the channel of the fluid reservoir into a first compartment and a second compartment, a first aperture in the first compartment allowing transfer of fluid into and out of the first compartment, and a second aperture in the second compartment allowing transfer of fluid into and out of the second compartment. The first aperture may fluidly connect the first compartment to an external pressure source, and the second aperture may fluidly connect the second compartment to a rotating device. The channel of the fluid reservoir may be toroidal and annular.

Abstract: A centrifugally balanced fluid reservoir comprising a fluid reservoir having a channel therein, a flexible barrier dividing the channel of the fluid reservoir into a first compartment and a second compartment, a first aperture in the first compartment allowing transfer of fluid into and out of the first compartment, and a second aperture in the second compartment allowing transfer of fluid into and out of the second compartment. The first aperture may fluidly connect the first compartment to an external pressure source, and the second aperture may fluidly connect the second compartment to a rotating device. The channel of the fluid reservoir may be toroidal and annular.