Indoor fire hydrant system, according to the industry encyclopedia network query. Indoor fire hydrant system is the most widely used fire fighting facility in buildings, which is used indoors in Kashgar, Xinjiang. It can not only be used by fire scene personnel to put out the initial fire with fire hoses and water guns in fire hydrant boxes, but also be used by firefighters to put out the fire in buildings. The working principle of indoor hydrant water supply system is related to the water supply mode adopted by the system. The building fire water supply system usually adopts temporary high-pressure fire water supply system. In the temporary high-pressure fire water supply system, the system is equipped with a fire pump and a high-level fire water tank. When a fire breaks out, the field personnel can open the fire hydrant box, connect the hose with the hydrant bolt, open the valve of the hydrant, and put the hydrant into use.