Hydrocyclone (or Cone or Cyclone)
Liquid-solids separation device utilizing centrifugal force for settling. NOTE Fluid enters tangentially and spins inside the hydrocyclone. The heavier solids settle to the walls of the hydrocyclone and move downward until they are discharged at the hydrocyclone apex. The spinning fluid travels partway down the hydrocyclone and back up to exit out the top of the hydrocyclone through a vortex finder.
Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards