Professional China 3mm 68℃ Bulb - 5mm Special response sprinkler bulbs – Zhurong

A glass sprinkler bulb is the most reliable and economic device used to actuate a fire sprinkler head. The frangible bulb is simple to use, comprising a small thermo bulb made of glass containing a chemical liquid that will expand rapidly when exposed to rising temperatures, bursting the glass fire bulb at an accurately pre-determined temperature, thereby activating the sprinkler.

Precision engineering and exhaustive quality control in every stage of production ensures that the 3 most critical bulb characteristics are achieved.
Uniform and consistent size
High mechanical strength
Highly accurate operation temperature within
tight tolerances
Consistent RTI values
The entire manufacturing process carries certification to the Quality Standard ISO9001:2015,

This product may also be referred to as:

Frangible Bulbs
Glass Sprinkler Bulbs
Thermo Bulbs

Product Description

Sprinkler bulbs are thermally actuated release elements for automatic sprinklers, smoke vents, fire dampers and other release devices. A hermetically sealed liquid in the glass bulbs expands with rising temperatures breaking the bulbs into small fragments at a predetermined release tem- perature. The bone shape design of Sprinkler bulbs combined with the special liquid are decisive factors for the outstanding thermal response perfor- mance and strength of the glass bulbs.

Sprinkler Bulbs
With their unique bone shape design rein- forced ends are used to absorb loads from the mounting supports and to introduce these axially into a shaft of reduced diameter thus avoiding unfavourable shearing and bending stresses in the glass. Furthermore the out- standing tension condition allows a low mass structure, which, combined with the special filling liquid, provides very low Response Times.

Response Time Index (RTI)
The Response Time Index is a calculated figure describing the actual operating time of a glass bulb mounted in a sprinkler or other devices in given standard conditions. The RTI is an indication of the thermal sensitivity of the glass bulb. The lower the value of the RTI, the faster the response time of the bulb. sprinkler bulbs are able to meet any RTI requirements the user may have by combining diff erent actuating liquids with various bulb diameters.
Standard Response Applications RTI>80
Special Response Applications 80>RTI>50
Fast, Super Fast and Ultra Fast-Response Applications RTI<50

Features

Design Flexibility
Its own drawn glass tubes. That offers huge flexibility for glass bulbs with different lengths, aspect ratios and strength / RTI specications towards customer‘s demand.
Operating Temperatures
The differnet colours of the fluid in the Sprinkler Bulbs signify differnet operating temperatures. The bulb colouring complies with all national and international standards for colour/temperature ratings