ZSTD-15 Concealed glass bulb sprinkler

As the sprinkler can be hidden inside the ceiling, with matched cover color with the color of ceiling, which is not easy to be found while providing protection, it is widely adopted by place with luxurious decoration and beautiful ornament, or place with low ceiling due to the decoration, or place with thick population or frequency cargo transportation, or place where exposed sprinkler is easily touched. For example, high class hotel, shop, recreation place and office building.
The sprinkler is composed of glass ball sprinkler, support ring, casing and cover. The casing and the cover are welded with fusible alloy of low melting point. It is installed inside the protective district via ductwork, acting as a fire detector and auto sprinkler. In case of fire inside the protective district, when the atmosphere temperature rises up and reaches the melting point of the fusible alloy, the cover will drop from the casing and expose the sprinkler. When the temperature keeps rising and reaches the operating temperature of the glass ball, the glass ball will explode, the sealant will drop and the sprinkler will spray to the protective district for fire extinguishments subject to the preset shape of spraying.