Inert gas fire fighting system having a pressure control valve

An inert gas fire fighting system for extinguishing fire in an object fire fighting section by supplying an inert gas fire extinguisher to the object fire fighting section while maintaining a concentration of the inert gas fire extinguisher at a minimum necessary concentration, said inert gas fire fighting system comprising:

• at least one fire extinguisher storage vessel containing the inert gas fire extinguisher therein in a gaseous state;
• a flow channel connecting said at least one fire extinguisher storage vessel to the object fire fighting section;
• a selector valve in said flow channel between said at least one fire extinguisher storage vessel and the object fire fighting section;
• at least one pressure control valve in said flow channel between said at least one fire extinguisher storage vessel and said selector valve, said at least one pressure control valve having a discharge side and defining a means for controlling the gas pressure of the inert gas fire extinguisher such that the gas pressure of the inert gas fire extinguisher on the discharge side is controlled to be no more than a reference gas pressure;
• and
• a constant-pressure gas source connected with said at least one pressure control valve such that gas pressure of said constant-pressure gas source determines the reference gas pressure.