APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES

**Definition:** This place covers:

Apparatus for separating or like treating (e.g. drying, extracting, purifying) in which centrifugal or centripetal effects are generated by free vortex flow, otherwise than by rotary bowls, rotors or curved passages. The free vortex flow generated may follow a flat spiral, have an unchanged or constant axial direction, or have a reversible axial direction.

The mixtures treated are composed of the following physical states of matter:

Accessories for such devices e.g. safety or control devices.

**Limiting references (this place does not cover):** - Combinations of cyclones with filters, for separating particles from gases or vapours -> B01D50/00 - Combinations of cyclones with electrostatic precipitating arrangements -> B03C3/14 - Cyclonic type combustion apparatus using fluent fuel -> F23C3/00 - Vortex burners e.g. for cyclone-type combustion apparatus -> F23D1/00

**Glossary:** - Vortex finder: overflow duct, which is the discharging outlet for the lighter fluid phase.