The invention concerns a fire extinguishing system valve (1) comprising a housing (2), a fluid inlet chamber (11) in the housing (2), a fluid outlet chamber (13) in the housing (2), and a closing body (9) reciprocable between a blocking state and a release state and which in the blocking state prevents a direct flow of fluid between the fluid inlet chamber (11) and the fluid outlet chamber (13) and in the release state connects the fluid inlet chamber (11) directly in fluid-conducting relationship to the fluid outlet chamber (13).
According to the invention the fire extinguishing system valve (1) has at least one manometer (15, 17) which is operatively connected to the fluid inlet chamber (11) or the fluid outlet chamber (13) and which is mounted to the housing (2), and a venting device (21) integrated into the housing (2) for the at least one manometer (15, 17).