Gas cylinder actuator with safety device

A gas cylinder actuator with safety device, which comprises:

• a tubular containment jacket,
• a stem-piston,
• two opposing heads for closing said tubular jacket, with corresponding sealing elements between the heads and the jacket, the two opposing heads comprising a first head and a second head, wherein the first head is provided with a through hole for the passage of the stem-piston, and the second head is provided with a gas filling duct,
• between said tubular jacket, said heads and said stem-piston there being a chamber for pressurized gas, wherein said second head has a seat for the accommodation of a flow control element of the gas filling duct and corresponding sealing means, said flow control element comprising a control tab for controlling a retracting stroke of said stem-piston, said control tab protruding from a body that has a lightened portion for triggering a controlled fracture or deformation in the event said control tab is crushed by said stem-piston, wherein said lightened portion comprises a radial lightening recess, which extends through an arc of 180°, with respect to a main axis of the flow control element, so as to define a flat portion of the body that is adapted to be deformed by bending toward the tab, or to be broken, under the action of the thrust of the stem-piston, in the event said control tab is crushed by said stem-piston.