An assembly for modifying patient airflow into a nasopharyngeal airway or trachea. A valve assembly having a valve seal is adapted to attach to an airflow generator. The valve seal is connected to and operable by a motor means. A controller circuit is connected to the motor means for operating the motor means incrementally such that pressurized air from the airflow generator continuously enters the interior feed tube from the inlet but passes out of the outlet only when the motor means causes the valve seal to move in relation to the exit tube to at least partially unblock the outlet such that the pressurized air is converted into a single, repeatable burst exiting the outlet. In one embodiment, instead of a motor, the valve assembly can include a shaft. A butterfly valve seal is attached to the shaft. A nickel titanium wire is in conductive communication with the shaft.
