| 摘要 |
In the input and output air channels (9,10) in the fire cells (3,4) are positioned self-acting check valves (13) over which normally rules a pressure drop in the air flow direction produced by the fans (11,12). This pressure drop maintains the check valves open, but they close au tomatically when the pressure drop over them ceases. Also in the input and output air channels are fitted other, normally open valves (21) with an operating device which has a heat sensor. These valves are automatically closed when the channel temp. exceeds a specific value and are also formed as check valves. When they are operated for closure, they automatically are activated towards their cut-off posn. by the flow in the channels which tends to open the first check valves (13). |
