Propellant tank with on-off control system for the flow of propellant gas and spacecraft incorporating such a control system

A thruster tank, the tank being adapted to store a solid or liquid propellant, the tank comprising means for forming a gas from the solid or liquid propellant in the tank, the tank including an opening of surface area S for extracting a flow of the propellant gas from the tank, wherein the tank includes a system for on-of control of the flow of gas, comprising a grid arranged opposite the opening of the tank, a first thermal regulation system suitable for regulating the temperature of the gas in the tank and a second thermal regulation system suitable for regulating the temperature of the grid, the grid including holes of total surface area greater than the surface area S of the opening of the tank, the first and second thermal regulation systems being configured to adjust a temperature difference between the temperature of the gas in the tank and the temperature of the grid, the temperature difference being variable between a first value higher than a threshold adapted for transmitting the gas flow through the grid and a second value lower than another threshold where the gas forms a solid deposit on the grid to obstruct the holes of the grid.