Patent ID: 6840457

Claim:
A wet-pipe sprinkler systems, comprising: a sprinkler head; a plurality of interconnected pipes having a first end and a second end, the plurality of interconnected pipes for supplying water to the sprinkler head; at least one water supply connected to the first end of the plurality of interconnected pipes; an electric main valve for controlling an inflow of water from the water supply to the plurality of interconnected pipes; an electric drain valve connected to the second end of the plurality of interconnected pipes for draining the water from the plurality of interconnected pipes; a central control studio including a first electrical control circuit, the first electrical control circuit for outputting a drain valve opening signal to the electric drain valve, which opens the electric drain valve, and for outputting a first main valve closing signal to the electric main valve, which closes the electric main valve, thereby blocking water from entering the plurality of interconnected pipes and draining water contained in the plurality of interconnected pipes, and wherein the plurality of interconnected pipes include: a main pipe having a first end and a second end, the first end connected directly to the at least one water supply, the main pipe including a water flow detector and an auxiliary valve; a water-filling pipe having a first end and a second end, both of which are connected to the main pipe, the water-filling pipe including an inlet valve and an outlet valve; and an auxiliary pipe having a first end and a second end, the first end connected to the second end of the main pipe, the auxiliary pipe including the sprinkler head, wherein the electric main valve is connected to the main pipe upstream of the water flow detector, and the electric drain valve is connected to the second end of the auxiliary pipe, and the first end of the water-filling pipe is connected upstream of the electric main valve and the second end is connected downstream from the auxiliary valve.