| 摘要 |
PCT No. PCT/FI92/00060 Sec. 371 Date Apr. 5, 1993 Sec. 102(e) Date Apr. 5, 1993 PCT Filed Feb. 28, 1992 PCT Pub. No. WO92/15370 PCT Pub. Date Sep. 17, 1992.A spray-head for fire fighting having a central bore which communicates with a liquid feed line. A movable spindle is positioned within the bore and has an upper end which sealingly engages the bore. The spindle has a shoulder for defining an annular space between a lower end of the spindle and the surrounding wall of the bore. A second bore extends through the spindle and communicates the annular space with the liquid feed line. The annular space has the same cross-sectional area as the upper end of the spindle, such that the force of the liquid pressure acting on the upper end of the spindle is counteracted by the force of the liquid pressure acting on the shoulder. A spring force is arranged to act on the spindle in the direction of release, and a fusible release element opposes the spring force.
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