Abstract: A centrifuge with a self-evacuating drum, with a line for feeding the drum with the stock to be centrifuged, with at least one outlet line with an elastic section for extracting a liquid phase from the drum under pressure, and with a mechanism for expelling solids from the drum at prescribed intervals. The elastic section is accommodated in an air-tight housing. The housing communicates with a compressor through a line. The line accommodates a valve that opens prior to every solids expulsion and subjects the elastic section to pressure from outside, compressing it in response to the reduction in pressure accompanying the solids expulsion and forcing as much product from the elastic section as solids are expelled from the drum.