Abstract: The invention relates to a device intended to be introduced into a pipeline for circulating a fluid and comprising an operational element, a central connecting rod and a plurality of radial lugs, these lugs being linked to the operational element by means of the connecting rod and extending, under the effect of an elastic force, like umbrella spokes, to press against the inside of the pipeline. According to the invention, the lugs are spaced regularly around a same fitting, and the elastic force is at least partly constituted of a turning torque applied to the lugs through support means constituted, for example, by an axial spring pushing a stop washer mounted to slide on the connecting rod.

Abstract: A device for centrifuging various samples of a product or a mixture of products which are chemical or biological, the device including a vessel which is open at the top and contains a vertical central shaft driven in rotation by a rotary driving means, a horizontal plate mounted interlocked in rotation on the central shaft and provided on its surface with a plurality of through orifices for the mounting of tubes which are each intended to contain a volume of a sample to be centrifuged, these through orifices having a substantially elongate shape with front and rear walls inclined at an acute angle of less than 90 degrees relative to the horizontal, and means for indexing the position of the plate each time the plate stops, in order to position through orifices of the tubes at predetermined sites.