Sprinkler is an important part of atomizing system. After the pressure water runs though the sprinkler and crashes in the top and the splashing disc, it is atomized and spray out to the protective area at specific spraying angle, for the purpose of cooling, fire-fighting and extinguishments. Among which the cooling effect is obvious that it enhances the thinning and dispersion of steam though heat absorption, to decrease the speed of combustion and reduce the danger of explosion and fire loss. It is usually used to protect dangerous district storing flammable liquid, flammable gas and solid with a flash point under 66℃. It can also be used as a sprinkler of foam system. For example, reservoir of dangerous articles, chemical warehouse, boiler room and garage.