Rapid inflation device for tubeless tyre

A rapid inflation device having a supply source (2) of pressurised fluid, a nozzle holder assembly (3, 4), that can be manually moved and located by an operator between a rest position and a working position and is provided with one or more blowing-in nozzle (5), a flexible conduit (6, 7) designed to put the supply source (2) of pressurised fluid in communication with the nozzle holder assembly (3, 4), a manual control (8, 9) provided at the nozzle holder assembly (3, 4) and designed to activate and deactivate the pressurised fluid feeding on the operator's control, sensors (10, 11) at the nozzle holder assembly (3, 4) designed to detect if the nozzle holder assembly (3, 4) is in working position, and slave valve means (13, 14) adapted to control the pressurised fluid feeding from the supply source (2) to the blowing-in nozzle (5), on the control of the safety sensor means (10, 11) and manual control means (8, 9).