| 摘要 |
<p>A ventilation valve for protecting a ventilation duct against penetration of spray or the like has a ventilation passage (7), which divides upward into at least two branches (8), a float chamber (9) between the branches (8), a float (10, 10') in the float chamber (9), an upper chamber (11), via which the float chamber (9) communicates with the branches (8), a valve seat (4), which can be shut when operated by the float (10, 10'), and at least two passages (12) at a level below the upper chamber (11), via which the float chamber (9) communicates with the surroundings in radially outward passage directions, and which passages (12) are each separated from the ventilation passage (7) by a bottom wall (13). Because the bottom walls (13), viewed in cross-section, each have a central part (20) located deeper with respect to lateral parts (19) of the bottom wall (13), the resistance to which water is subjected when flowing to the branches is limited.</p> |
