Patent ID: 8444541

Claim:
A solid-bowl screw centrifuge comprising: a rotatable drum having a horizontal axis of rotation, the rotatable drum surrounding a centrifuging space and including at least a tapering portion; a screw is arranged in the drum, the screw being rotatable at a differential speed in relation to the drum; at least one solid-material discharge located in the tapering portion of the drum; an immersion disk on the screw, which disk lies between a liquid feed and the solid-material discharge and subdivides the centrifuging space into a discharge space located between the immersion disk and the solid-material discharge and a separating space located between the immersion disk and a liquid discharge; a device for admitting a gas to the separation space, the device including a pressure control unit and a regulating device to measure and control a pressure in the separation space; and wherein the liquid discharge is sealed from its surroundings in such a way that when gas pressure is admitted under measurement and control of the pressure control unit and the regulating device, a level R 1 of a pond SP in a region of the separation space remains unchanged when the pressurization occurs via the gas entering the separation space via a feed line.