Abstract: A rotating seal for a continuous flow centrifuge is disclosed. The rotating seal is mounted at the center of mass of the rotor to reduce vibration of the seal. The nonrotating portion of the rotating seal is maintained in contact with the rotating portion of the seal by a three point spring secured to a housing which is resiliently mounted to the chamber which encloses the rotor. In this manner, the nonrotating disk is able to follow the reduced amplitude vibrations of the rotating disk with reduced leakage.

Abstract: Apparatus for separating a liquid, such as whole blood, into fractions having different densities includes a separation chamber and a transfer device, such as a continuous piece of flexible tubing, for supplying the liquid to the separation chamber and discharging the liquid fractions therefrom. The separation chamber and the transfer device are conjointly rotated about a first axis which passes through a stationary end of the transfer device, while being simultaneously and conjointly rotated about a second axis which is coincident with a medial longitudinal axis of the rotating end of the transfer device so as to prevent the transfer device from twisting as a result of its rotation about the first axis.