VK4621 Concealed Quick-Response Fire Sprinkler Head (FM/UL Certified, K80, 68℃)

The VK4621 is a concealed quick-response fire sprinkler head with FM/UL certifications, featuring a K-factor of 80 and activation at 68℃. It combines aesthetic integration with fast fire suppression, ideal for commercial and residential spaces requiring unobtrusive protection.

•Product Name：VK4621 Concealed Quick-Response Fire Sprinkler Head (FM/UL Certified, K80, 68℃)
•Material :Brass/Stainless Steel (durable materials for long-term fire protection reliability)
•Size :1/2"–1" BSPT (compatible with standard piping systems for easy installation)
•K-Factor :K80 (ensures appropriate water flow rate for efficient fire suppression)
•Activation Temperature :68℃ (quick-response design triggers promptly in fire emergencies)
•Certification :FM Certified, UL Certified (meets international fire safety standards for quality and performance)
•Installation Type :Concealed Type (blends with building interiors while maintaining fire protection functionality)
•Response Type :Quick-Response (faster activation compared to standard sprinklers, minimizing fire spread)
•Nominal Pressure :5–50 bar (72.5–725 psi) (adapts to various commercial and industrial water supply pressures)
•Operating Temp :-20°C to +60°C (stable performance in diverse environmental temperature ranges)
•OEM Service :Accepted (supports customizations for logos, packaging, or specific technical requirements)
•Delivery Terms :FOB, CFR, CIF, EXW (flexible shipping terms to meet global customer needs)
•Payment Mode :T/T, L/C, PayPal, Western Union (secure and convenient payment options)

Product category:

UL/FM Fire Sprinkler

Enterprise Atlas:

Email:

linhaifeng117@gmail.com

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Product Details

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Product Formation

The VK4621 fire sprinkler head stands out as a high-performance solution tailored for modern fire safety needs, boasting dual FM and UL certifications—two of the most authoritative benchmarks in the global fire protection industry. These certifications validate its compliance with rigorous safety standards, ensuring reliable operation in critical fire scenarios.​

With a K-factor of 80, the sprinkler delivers a calibrated water flow rate that balances efficiency and coverage, enabling it to quickly douse flames and prevent fire spread in its early stages. Its activation temperature is set at 68℃, a standard yet critical threshold that triggers rapid response: as a quick-response model, it reacts faster than traditional sprinklers, reducing heat buildup and minimizing property damage and potential hazards to occupants.​

Designed as a concealed type, the VK4621 remains hidden within ceiling cavities when not in use, only exposing its spray component upon activation. This design preserves the aesthetic integrity of interior spaces—such as hotels, offices, retail stores, and high-end residences—without compromising fire protection functionality. It is compatible with standard piping systems, supporting easy installation and integration into existing or new fire safety setups, while its durable construction (typically brass or stainless steel, as per industry standards) ensures long-term resistance to corrosion and wear, extending its service life.

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Product Features

1.Dual FM/UL Certifications: Meets strict international safety standards, guaranteeing reliability and compliance for global markets, giving users and regulators confidence in its performance.​

2. Quick-Response Activation: Triggers rapidly at 68℃, accelerating fire suppression, reducing flame spread, and lowering risks of heat-related damage and casualties compared to standard sprinklers.​

3. Concealed Design: Remains hidden in ceilings when inactive, maintaining the visual appeal of interior spaces while ensuring immediate deployment when a fire occurs.​

4. Calibrated K80 Flow Performance: Delivers an optimal water flow rate via its K80 factor, ensuring sufficient coverage and fire-extinguishing efficiency for targeted protection areas.​

5. Versatile Compatibility: Works with standard piping systems, simplifying installation and retrofitting processes across commercial, residential, and public building environments.​

6. Durable Construction: Crafted from corrosion-resistant materials (e.g., brass/stainless steel), ensuring long-term durability, stable performance, and resistance to environmental wear.
 

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Product Parameter

Model	VK4621
Product Type	Quick-Response Concealed Fire Sprinkler Head (K80, 68℃)
Certification	FM Approved, UL Listed
K-Factor	K80 (22.4 gpm/psi¹⁾²)
Temperature Rating	68℃ (154.4℉), Glass Bulb Heat-Sensitive Element (Red Color Code)
Response Type	Quick-Response (RTI ≤ 50)
Inlet Connection	1/2 inch (DN15) NPT Female Thread
Installation Type	Concealed (Recessed Design, Flush with Ceiling When Not Activated)
Operating Pressure Range	0.1MPa - 1.2MPa (14.5psi - 174psi)
Flow Rate	Typical: 24.4 GPM at 30psi; 34.5 GPM at 60psi (varies by system pressure)
Spray Pattern	Full Cone Coverage (360°), Uniform Water Distribution
Material	Brass Body (Corrosion-Resistant), Tempered Glass Bulb, Stainless Steel Components
Working Temperature	-10℃ to 60℃ (14℉ to 140℉)
Application	Commercial Buildings, Shopping Malls, Hotels, Office Complexes, Residential Areas
Compliance Standards	NFPA 13, FM 13, UL 199, GB 5135.1
Product Dimensions	110mm × 75mm × 55mm (L × W × H, Concealed State)
Net Weight	0.32 kg
Special Features	Concealed design for aesthetic appeal; Quick-response for fast fire suppression; Anti-clog nozzle; Corrosion-resistant brass construction

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FAQ

Q: Can you accept sample order?

A: Yes, we accept samples with little and reasonable charge.But need customer pay sample fees and transport fees first.

Q: What is your payment terms?
A: Payment supports T/T, L/C, etc.

Q: How can l get my order?
A: We will send you the goods by UPS,DHL,FedEx,Oversea Shipment or other forwarder, all with tracking number.

Q: Why choose us?
A： With over 15 years of experience in the fire protection industry, our company has professional technical personnel and many well-known partners in the domestic market. We offer favorable prices and guarantee quality, having passed multiple certifications!

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With more than 15 years of experience serving clients, we have developed extensive expertise and in-depth industry knowledge, enabling us to deliver reliable and effective solutions tailored to your requirements.
We provide professional technical support and customized service offerings. Our committed technical team is available to assist you with product consultation, installation guidance, and comprehensive after-sales support whenever necessary.
At Sheng Feng Fire, our professionals are dedicated to helping you select the most suitable products based on your specific needs.
Please do not hesitate to contact us for further information！