一、结构及用途 Structure and purpose

该阀用于生活供水和消防供水并联供水系统中，正常情况供生活用水，当火灾发生时消防用水时，阀门自动关闭生活用水，确保足够的消防用水。当消防停止用水时压力减少，阀门自动恢复生活用水，该阀使系统无须另设专门的消防单独供水管网，大大地节省了工程建设成本和日常的用水量。该阀控制灵敏、安全可靠、调试简单、使用寿命长。

Used in the living and fire-fighting merged water supply system It supplies living water at normal condition and．in case of a fire，automatically close the living water and open the fire-fighting one to make it surely enough，ａnd then when fire-fighting water stops and the pressure is reduced，resets the living wa-ter automatically．Thus making the system no need to set an individual fire-fighting water supply pipe network and both engineering construction cost and daily water used quantity greatly saved.It features sensitive control,safety,reliability,simple debugging and long duration

四、主要外形及连接尺寸 Schematic diagram of installation

注：安装示意图中弹性座封闸阀或蝶阀任选，建议≥ DN350选蝶阀。

Note：Either elastic seat ring sealed gate valve of butterfly valve can be selected in the schematic diagram of installation.Recommended to select the butterfly valve in case of≥DN350