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.

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