本湿式报警阀为盖板型报警阀,主要由阀体、座圈和阀三部分组成,整个阀体被阀瓣分成上、下两腔,上腔(系统侧)与系统管网相通,下腔(供水侧)与水源相通,在阀体中配有座圈,在座圃上,有多个通往延迟器进水管的沟槽小孔。当系统处于伺应状态时,座围上的沟槽小孔被阀瓣盖住封闭,通往水力警铃的报警水道被堵死:当上、下压力差达到一定数值,阀瓣才开启(差压启动),水就从供水侧流向系统侧,警铃报警,灭水系统喷水;当上、下压力频繁开启,在阀瓣上设有小补水阀,当系统侧管网有微小渗漏或水源压力有波动时,可以通过补水阀始管网补水,平衡上、下腔压力,稳定了阀瓣,从而避免了误报警.
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