The glass bulb sprinkler head is an important component of sprinkler system.Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb (see below) or a two-part metal link held together with fusible alloy such as Wood's metal and other alloys with similar compositions.The glass bulb or link applies pressure to a pipe cap which acts as a plug prevents water from flowing until the ambient temperature around the sprinkler reaches the design activation temperature of the individual sprinkler. Each sprinkler activates independently when the predetermined heat level is reached, the number of sprinklers that operate is limited to only those near the fire, thereby maximizing the available water pressure over the point of fire origin.
There are six Glass bulb colors: orange,red,yellow,green,blue and purple.
The mechanism is that the glass bulb is sensitive to heat, when surroundings temperature up to a certain point,the glass bulb will break and activate the sprinkler to spray water for fire extinguishing.
| Nozzle Rated Temp |
Max Ambient Temp |
Glass Ball Color |
| 57°C /135°F |
27°C /81°F |
Orange |
| 68°C/155°F |
38°C /100°F |
Red |
| 79 °C /175°F |
49°C /120°F |
Yellow |
| 93°C /200°F |
63 °C /145°F |
Green |
| 141°C /286°F |
111°C /231°F |
Blue |
| 182°C /360°F |
152°C /305°F |
Purple |
Basic Info
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Customization Process
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Product Range
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Subomen(Shanghai) Industry Co. Ltd located in Shanghai China has about 17 years experience in producing fire extinguish equipment since 2007.
There are 20 engineers, 30 technicians .The company has established a strict quality management system since its establishment, and has successively passed 9001 quality system certification, 14001 environmental system certification, and 18001 health system certification. The company provides targeted, exclusive and high-quality fire protection technologies and products for different customers, providing customers with one-stop overall fire safety solutions. The products cover civil construction, petrochemical industry, electric power, tunnels, subways, urban pipe corridors, airports, data centers and other places.
