Compressor apparatus and method for the operation of the same

Compressor apparatus comprising a radial compressor (35) for the compression of a gas and also an electric motor (31) for driving the radial compressor (35) wherein the radial compressor (35) and the electric motor (31) are arranged in a pressure housing (1) which is provided with a gas inlet duct (2) and also a gas outlet duct (3) and also comprising an encapsulated apparatus (4) arranged in the pressure housing (1), the inner space of the encapsulated apparatus being fluid conductingly connected to a pressure reducing apparatus (37), wherein the pressure reducing apparatus includes an actuatable valve in order to controllably reduce the pressure in the inner space and a sensor far the determination of the pressure in the encapsulated apparatus and also a regulating apparatus, with the regulating apparatus detecting a sensor value, comparing this with a desired value and if required actuating the valve.