Pyrotechnical actuator with variable thrust

The actuator has a pyrotechnic gas generator (7), a combustion chamber (3) and a piston (9) placed in a sliding chamber under the effect of gas. The combustion chamber has an obturation device (4) that is implemented after the activation of the actuator for closing the sliding chamber and for depressurizing the combustion chamber. The obturation device is in contact with the sliding chamber.