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10
2026
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02
Decoding FM/UL Certified DN20 DN25 Head K363 Fusible Alloy Sprinkler Head: The "Hardcore Guard" for High-Rack Warehouses
The fusible alloy temperature-sensitive element is the core that distinguishes it from glass bulb sprinkler heads. It is composed of low-melting-point alloy welding pieces and metal yokes. When the ambient temperature reaches the nominal operating temperature, the fusible alloy welding pieces will melt quickly, losing the welding force. Under the action of pipe network water pressure, the metal yokes will disintegrate, and the sprinkler head will open and spray water immediately, which can intervene in the early stage of a fire (smoldering stage) in a timely manner to avoid the expansion of the fire.
In the fire protection systems of modern logistics warehouses and industrial plants, sprinkler heads serve as the "last line of defense" of automatic sprinkler systems, and their performance directly determines the control effect in the early stage of a fire. The FM/UL DN20 DN25 Head K363 Fusible Alloy Sprinkler Head (hereinafter referred to as K363 Sprinkler Head) has become the preferred choice for high-rack warehouses, heavy-duty industrial scenarios and other places, relying on dual authoritative certifications, precise specification adaptation and superior fire-fighting efficiency. Different from civil sprinkler heads, the core advantages of this industrial-grade "special equipment" are worth exploring in depth.
Key Point 1: Backed by Dual Authoritative Certifications, Building a Globally Applicable Safety Threshold
Certification is the quality "passport" for fire protection products. The dual FM and UL certifications of the K363 Sprinkler Head are the core confidence for its foothold in the global market, the key difference from ordinary sprinkler heads, and also a strict endorsement of product reliability.
UL certification focuses on assessing the core fire-fighting performance and long-term stability of sprinkler heads. It is a core access requirement for the North American market and enjoys high global recognition; FM certification has more stringent testing standards, additionally assessing durability, making it more suitable for harsh environments such as chemical industry and heavy-duty warehousing with outstanding advantages.
FM and UL certifications are not interchangeable. High-end industrial projects often require dual certifications, and the K363 Sprinkler Head precisely meets this demand. It can not only enter the North American market, but also adapt to foreign-invested projects and large-scale logistics parks at home and abroad, making it the preferred choice for upgrading the quality of fire protection projects.
Key Point 2: Differentiation of DN20/DN25 Specifications for Precise Protection in Different Scenarios
When selecting sprinkler heads, DN20 and DN25 specifications are easily confused. The core difference between the two lies in the nominal diameter and flow adaptability, corresponding to different protection needs. The K363 Sprinkler Head covers most industrial scenarios through two specifications to avoid improper adaptation.
DN25 is the mainstream specification of the K363 Sprinkler Head, suitable for large-flow fire-fighting needs. It can cope with scenarios with high fire load and rapid spread such as high-rack warehouses and heavy-duty industrial plants. With its large-diameter design, it delivers sufficient water flow, and combines the flow advantage of K363 to quickly suppress the fire.
The DN20 specification focuses on medium-flow protection, suitable for scenarios with low fire load and compact space such as small industrial plants and auxiliary warehouse areas. It can not only ensure the protection effect, but also reduce the pressure loss of the fire protection pipe network and engineering costs.
The core of selecting the two specifications depends on the fire risk and space size: DN25 is preferred for high-rack warehouses and heavy-duty industrial plants, while DN20 can be selected for small industrial plants and auxiliary areas. Only precise matching can exert the best effect and control costs.
Key Point 3: K363 Flow Coefficient + Fusible Alloy, Unlocking the "Dual Advantages" of Industrial-Grade Fire Fighting
Certification and specifications are the foundation of the K363 Sprinkler Head. The K363 flow coefficient and fusible alloy temperature-sensitive element are its core competitiveness. The two work together to achieve "rapid response and strong fire fighting", breaking the limitations of traditional sprinkler heads.
K363 belongs to the category of large-flow sprinkler heads. Its specially designed deflector can convert water flow into high-energy water droplets, which can quickly cool the hot air in the early stage of a fire and penetrate the fire plume to act on the burning body. This is also the core reason why it can replace some ESFR (Early Suppression Fast Response) sprinkler heads.
Fire tests show that the K363 Sprinkler Head can achieve effective fire extinguishing with reasonable water pressure in industrial scenarios with high and medium height ceilings. In some scenarios, its effect is comparable to that of ESFR sprinkler heads, and it has more advantages in cost.
The fusible alloy temperature-sensitive element is the core that distinguishes it from glass bulb sprinkler heads. It is composed of low-melting-point alloy welding pieces and metal yokes. When the ambient temperature reaches the nominal operating temperature, the fusible alloy welding pieces will melt quickly, losing the welding force. Under the action of pipe network water pressure, the metal yokes will disintegrate, and the sprinkler head will open and spray water immediately, which can intervene in the early stage of a fire (smoldering stage) in a timely manner to avoid the expansion of the fire.
Compared with glass bulb sprinkler heads, it has stronger impact resistance and corrosion resistance, suitable for scenarios such as forklift operations. In addition, the color of its yoke can distinguish the operating temperature, which is convenient for on-site installation verification and later maintenance.
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we mainly have: water system accessories, stainless steel fire boxes and foam fire hydrant box accessories, valve accessories, intelligent above-ground hydrants and intelligent end-of-line test devices and automatic fire cannons, as well as accessories and fire equipment and valve product OEM processing.