Patent-family-89542062

A hygienic compression device having an impeller housing, an impeller, and a motor. The impeller housing having an axial inlet and radial outlet. The axial inlet receiving flash steam from a flash steam outlet of a flash vessel. The radial outlet suppling compressed flash steam to a heat treatment apparatus. The impeller is disposed in the impeller housing. The motor is configured to rotate the impeller. Flash steam enters the inlet and is radially accelerated and compressed in response to rotation of the impeller.