(57) An actuator comprising a fluid-actuated jack, which can be activated by a gas contained
under pressure inside a bottle (14); a percussion-type piercing element (15), which
can move between a passive position for closing the bottle and an active position
for piercing the bottle (14) in order to activate the jack; a mechanical flow control
device, which comprises a sensor (32) for detecting hot gases and smoke and a flow
control element (27) that is controlled by the sensor and is functionally associated
with the piercing element (15) so as to allow the movement of the piercing element
from the passive position to the active position when the sensor detects the presence
of the hot gases and smoke. The jack comprises a cylinder (2) that is closed by a
lower cap (4) that has a connecting element for supporting the bottle (14) inside
the cylinder (2), and seats (31, 23, 12) for accommodating the sensor (32), the flow
control element (27) and the piercing element (15).
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