English to Spanish Medical Medical: Pharmaceuticals Metered Dose Inhalers

Does anyone know the translation for this? I'm thinking of "disparador" or something similar.

CONTEXT: If the **fire down** actuations through life are being performed using the automated **fire down** apparatus, take the aerosol units after the Start of Life Dose Sample Solutions have been prepared and follow steps 20 and 24 to 28. [...] Remove the aerosol unit from the actuator and place the aerosol unit into the automated **fire down** apparatus.

Additional information found:
http://www.pharmaceutical-technology.com/contractors/drug_de...
Agitation and actuation of MDI canisters
The pneumatic actuation principle is applied in the Fire Down 10 (FD-10) which allows simultaneous agitation and subsequent actuation of ten MDI canisters at a time, eliminating the extreme tediousness of performing 'Dose Content Uniformity (DCU) Through Container Life'. The discharge is evacuated to a filter through a vacuum system. This is a compact stand-alone system with a touch-panel user interface.

Thank you in advance!