Abstract: A device for controlling, in association with a stop valve, the gas stream delivered by a pressurized gas reservoir, whose casing is provided with an opening so that the inside of said reservoir may be connected to the outside. A cylinder is divided into a first chamber and a second chamber by a piston. The first chamber is in communication with the opening in the casing and includes an orifice which can be connected with the stop valve. A core is connected to the piston on the side thereof turned towards the first chamber. The core cooperating with the orifice so as to form a variable flow section as a function of the position of the piston in the cylinder. A passage with a non-return valve establishes communication between the first and second chambers of the cylinder. A controllable locking device is capable of locking the piston in the cylinder.

Abstract: Pressurized gas tank comprises a casing provided with an opening communicating with an orifice and connecting the inside of the tank with the outside. Gas flow through the orifice is controlled by a flow control valve. The casing is elastically deformable in response to the gas pressure contained in said tank (1). Deformation of the tank is transmitted to the flow control valve to control the flow of gas therethrough.