Full Cone Spiral Nozzle
Full Cone nozzles use a specially shaped vane placed at the nozzle inlet to give a rotational twist to the fluid flowing through the nozzle. Because of the rotational speed twisting of the fluid, water exiting the nozzle orifice is subjected to centrifugal force and opens up in the shape of a Full Cone. The extent of the angle of the cone is a function of both exit speed (created from the inlet pressure) and the internal design of the nozzle.
continuous liquid curtain evolving with the shape of a spiral inside a conical volume. The disadvantage of a scarcely even distribution is compensated by an exceptionally good resistance to clogging, large orifice and vaneless which make this nozzle the best choice in those applications such as wet scrubber, fire-fighting systems, etc.
It can vary in practice from 15° to 120°.