Pyrotechnic gas generator with adjustable pressure

The gas generator (1) has an initiation system (10) of a pyrotechnic load (6), and a combustion chamber that is provided with a pressure regulation device (3). The pressure regulation device closes through a ball (16), and a duct connects an interior of the combustion chamber to an exterior of the generator. The ball is hermetically plated against an end of the duct, by a pre-stressed unit.