| 摘要 |
PCT No. PCT/FI94/00058 Sec. 371 Date Aug. 9, 1995 Sec. 102(e) Date Aug. 9, 1995 PCT Filed Feb. 14, 1994 PCT Pub. No. WO94/17857 PCT Pub. Date Aug. 18, 1994A valve for a fire fighting installation has a housing, an inlet into the housing and connectable to a source of extinguishing liquid at a high pressure, an outlet from the housing and connectable to an outgoing line having at least one automatically releasable spray head, and a connection in the housing for passing liquid between the inlet and outlet. A spindle in the housing is movable between a standby position, in which the spindle closes the connection, and an activated position, in which the spindle opens the connection. A liquid space in the housing and connectable to a secondary source of extinguishing liquid at full and lesser pressures that both are lower than the high pressure of the extinguishing liquid of the source applies the lower pressures to the spindle in a direction toward the standby position of the spindle. A channel in the housing connects the outlet to the liquid space and a spring applies a force to the spindle in a direction opposite to the direction of the pressures of the liquid space. The pressures of the secondary source and the force of the spring are mutually adapted in such a way that, when the secondary source acts with the full pressure, the spindle is held in the standby position and, when the secondary source acts with the lesser pressure, the spring drives the spindle to the activated position. |
