一、STRUCTURE AND PURPOSS

Used in the living and fire-fighting 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 the when fire-fighting water stops and the pressureis reduced,resets the living water automatically.Thus makign the system no set an individual fire-fighting water supply pipe network and both engineering construction cost and daily used quantitygreatly saved .It faetures sensitive control,safely,reliability,simple debugging and long duration.

二、 SCHEMATIC DIAGRAM OF INSTALLATION