Patent ID: 8499845

Claim:
A device for controlling the output pressure of a fire extinguishing system of the high-pressure gas type, comprising: at least one compressed gas container: and a pressure reduction valve, said pressure reduction valve being a pressure-controlled, self-regulating control valve comprising: a valve housing having an inlet opening connected to said one compressed gas container, the valve housing defining an annular high-pressure chamber, an outlet opening, a cylinder bore; and a control piston displaceable in the cylinder bore, the control piston having a side thereof defining a control pressure chamber in which a control pressure is applied such that the control piston is controlled by said control pressure, wherein the control piston is displaceable in the cylinder bore in the valve housing against the action of a spring means and the control piston and the cylinder bore are provided with cooperating passages which, in a defined position of the control piston, communicate with said annular high-pressure chamber and connect the inlet opening with the outlet opening, whereby the control valve is configured such that the high pressure of the compressed gas container exerts no displacing force component on the control piston and a pressure of the gas that flows from the outlet opening is less than said control pressure.