Fire butterfly valve has the characteristics of light weight, fast and reliable switch, small operating torque, with valve opening scale and so on. It can show the opening degree of the valve more intuitively so as to judge the opening of the valve outside the valve. It is often used in all kinds of fire water systems where no signal valve is required. Widely used in: chemical, petrochemical, petroleum, paper, mining, power, liquefied petroleum gas, food, pharmaceutical, water supply and drainage, municipal, machinery and equipment supporting, electronic industry, urban construction and other fields. The pressure level of the fire butterfly valve is 2 times that of the ordinary butterfly valve. The lowest is 1.2Mpa and the highest is 1.6Mpa. It's equivalent to 2.4Mpa~3.2Mpa. Fire butterfly valve is said to be the switch in the fire pipe network, because the water in the fire pipe network must be kept open, so as to ensure the timeliness of fire extinguishing, so once the signal butterfly valve is closed, the signal module will report the fire warning to the main engine and inform the monitoring center that the fire pipe network is closed.