Structure and application: This kind of valve makes up of main valve, pin valve, pilot valve, ball valve and pressure meter etc .The emergency close valve is used for the water supply system that fire water and living water are parallel connected in the residential areas. When needs the fire water, the valve automatically closes the living water in urgency to ensure the fire-fighting water supply. After the fire finishes, the valve will be opened automatically, and resumes the living water supply, It can save more cost than traditional single fire water supply system.