The present invention relates to a fire extinguishing system comprising a fire extinguishing medium container (3), a first (5) and second (7) fire extinguishing sub-systems, and a valve assembly (9) fluidly connecting the fire extinguishing medium container (3) to each of the first (5) and second (7) fire extinguishing sub-systems. The fire extinguishing system (1) further comprises a first and a second detection conduit arrangement (19, 21) connected to the valve assembly (9) and arranged to activate the fire extinguishing system (1), wherein the valve assembly (9) comprises a valve chamber (33), a valve member (35) being movably arranged in the valve chamber (33), the valve member (35) having: i) a first force receiving surface (45) arranged to be subjected to a first force (F1) exerted by a force applicator of the first detection conduit arrangement (19), and ii) a second force receiving surface (47) arranged to be subjected to a second force (F2) exerted by a second force application arrangement of the second detection conduit arrangement (21).