2014 latest fire sprinkler pendent for automatic dry powder fire extinguisher
Specifications Fire sprinkler system, fire extinguisher sprinkler, fire suppression sprinkler 1. Thread size: 1/2", 3/4" 2. Working pressure: 3-12 Fire sprinkler system, fire extinguisher sprinkler, fire suppression sprinkler
A fire sprinkler is the part of a fire sprinkler system that discharges water when the effects of a fire have been detected, such as when a predetermined temperature has been exceeded. Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb 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 pip cap which acts as a plug which prevents water from flowing until the ambient temperature around the sprinkler reaches the design activation temperature of the individual sprinkler. Because 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.
The bulb breaks as a result of the thermal expansion of the liquid inside the bulb. The time it takes before a bulb breaks is dependent on the temperature. Below the design temperature, it does not break, and above the design temperature, it takes less time for higher temperatures. The response time is expressed as a response time index (RTI), which typically has values between 35 and 250 m½ S½ , where a low value indicates a fast response. Under standard testing procedures (135 ° C air at a velocity of 2.5 m/s), a 68 ° C sprinkler bulb will break within 7 to 33 seconds, depending on the RTI.  The RTI can also be specified in imperial units, where 1 ft½ S½ Is equivalent to 0.55 m½ S½ . The sensitivity of a sprinkler can be negatively affected if the thermal element has been painted. Why choose us 1. We have our own factory. The quality of our products can be guaranteed. 2. The best quality, service and team are our aim all the time. 3. Our products enjoy high reputation in the world. 4. We can provide resonable price for you. The specific information about our company Shanghai Dehuan limited company is an industry which specialises in producing and selling all kinds of fire extinguisher. Most of our products have reached the state standard. We are working for mutul-benefits.