Nozzle and fire fighting installation

A fire fighting installation comprising a plural number of sprinklers or spray heads 913 to 20, 53 to 56;

• 17 to 20, 57 to 59), including nozzles (60), each nozzle comprising a housing (7), an inlet end (1) and a first conduit (20 leading from the inlet end to a nozzle opening (3) for spraying extinguishing medium from the nozzle said nozzle also comprising a second conduit (4) formed in the housing (7) of the nozzle for spraying extinguishing medium from the nozzle, and a valve element (6) loaded by a helical spring (5) being arranged inside the housing so as to keep the second conduit closed when the valve element is subjected to a first pressure by said medium, and the valve element being arranged to open said second conduit when the valve element is subjected to a second pressure by said medium, the second pressure being higher than the first pressure, wherein the first conduit (2) is arranged to be open when the valve element (6) is subjected to said first pressure, the valve element is positioned in the housing (7) of the nozzle displaceably in relation to the housing of the nozzle, and the first conduit (2) and the second conduit (4) are adapted to lead medium to a common nozzle outlet (46), characterized in that
• the first conduit (2) is arranged inside the valve element (6),
• the helical spring (5) is arranged around the valve element (6) with a small spacing and is positioned inside the second conduit (4) so that the coils of the helical spring define a spiral path (8) for the extinguishing medium,
• the sprinklers or spray heads are arranged t be activated depending on the location of the fire so that only some (e. g. 13, 14) of the sprinklers or spray heads are activated at the beginning of the extinguishing process, and the installation comprises a pressure source (100) comprising a pressure accumulator and lines (22 to 26), including main lines (24), for supplying extinguishing medium to the sprinklers or spray heads, and
• the pressure source (100) is arranged to supply extinguishing medium first at a high pressure, and then at a lower pressure, and when an increasingly large number of sprinklers or sparay heads are activated, the pressure source is arranged to increase the flow.

A fire fighting installation comprising a plural number of sprinklers or spray heads (13 to 20, 53 to 56;

• 17 to 20, 57 to 59), including nozzles (60), each nozzle comprising a housing (7), an inlet and (1) and a first conduit (2) leading from the inlet end to a nozzle opening (3) for spraying extinguishing medium from the nozzle, said nozzle also comprising a second conduit (4) formed in the housing (7) of the nozzle, for spraying extinguishing medium from the nozzle, and a valve element (6) loaded by a helical spring (5) being arranged inside the housing so as to keep the second conduit closed when the valve element is subjected to a first pressure by said medium, and the valve element being arranged to open said second conduit when the valve element is subjected to a second pressure by said medium, the second pressure being higher than the first pressure, wherein the first conduit (2) is arranged to be open when the valve element (6) is subjected to said first pressure, the valve element is positioned in the housing (7) of the nozzle displaceably in relation to the housing of the nozzle, and the first conduit (2) and the second conduit (4) are adapted to lead medium to a common nozzle outlet (46), characterized in that:
• the first conduit (2) is arranged inside the valve element (6),
• the helical spring (5) is arranged around the valve element (6) with a small spacing and is positioned inside the second conduit (4) so that the coils of the helical spring define a spiral path (8) for the extinguishing medium,
• the sprinklers or spray heads are arranged to be activated depending on the location of the fire so that only some (e.g. 13, 14) of the sprinklers or spray heads are activated at the beginning of the extinguishing process, and the installation comprises a pressure source (21) and lines (22 to 26), including main lines (24), for supplying extinguishing medium to the sprinklers or spray heads, and
• the pressure source (21) is arranged to supply extinguishing medium first at a high pressure, and as the pressure drops in the large number of sprinklers or spray heads are activated, the pressure source is arranged to increase the flow so that the power supplied by the pressure source will not drop directly proportionally to the drop in the pressure.