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Ningbo DSW International Co., Ltd.

Open Type Fire Sprinkler Head, Fire Sprinkler Head, Fire Fighting manufacturer / supplier in China, offering Open Type Fire Sprinkler Head, Outside Siren With Strobe (EPA-73S), Outside Siren With Strobe (EPA-100P) and so on.

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Open Type Fire Sprinkler Head

FOB Price: US $1.5 / Piece
Min. Order: 5,000 Pieces
Min. Order FOB Price
5,000 Pieces US $1.5/ Piece
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Production Capacity: 50000PCS/Year
Transport Package: Carton
Payment Terms: L/C, T/T, Western Union

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Basic Info
  • Model NO.: ZST
  • Connecting Thread: 15/20mm
  • Working Temp: 68 Degree
  • Specification: CE ISO
  • Fire Sprinkler Material: Bronze,Brass,Zinc
  • Glass Bulb Diameter: 3mm&5mm
  • Trademark: DSW
  • Origin: China
Product Description
Packaging & Delivery
Packaging Details: 200pcs per CTN, 50pcs per foam box;
Delivery Detail: Within 15 working days after payment received
Specifications

Open type fire sprinkler head
1. Different style of open fire sprinkler head
2. Heavy Weight
3. Offer SGS report



Open type fire sprinkler head

DEACRIPTION
Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb (see below) or a two-part metal link held together withfusible 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 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. [13] 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.
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