| 摘要 |
<p>The invention relates to a spray-head for fire fighting. The spray-head according to the invention comprises a housing having a central boring with a movable spindle (11), the spindle (11) comprising a shoulder (11a) for defining an annular space (15) between the spindle (11) and a surrounding boring wall, the annular space (15) communicating with a respective feed line (3) and having the same cross-sectional area as the end of the piston (11) subected to the liquid pressure in the line (3). A spring force (16) is arranged to act on the piston (11) in the direction of release.</p> |
