FM Certified VK352 K115-68℃ Concealed Sprinkler / K-ZSTDY20-68℃ Quick-Response Concealed Sprinkler

The FM-certified VK352 K115-68℃ Concealed Sprinkler (also labeled K-ZSTDY20-68℃) is a high-performance fire protection device. It combines a concealed design for aesthetic appeal with quick-response functionality, ensuring reliable fire suppression in various indoor environments.

•Product Name：FM Certified VK352 K115-68℃ Concealed Sprinkler / K-ZSTDY20-68℃ Quick-Response Concealed Sprinkler
•Material :Brass (main body) + Stainless steel (heat-sensitive component and fasteners)
•Size :1/2"–1" BSPT (compatible with standard piping systems for easy installation)
•Nominal Pressure :5–50 bar（72.5–725 psi）
•Operating Temp :Activation temperature: 68℃; Working environment temperature: -20°C to +60°C
•Certification :FM Global Certified (meets strict fire safety performance standards)
•Response Type :Quick-Response (fast heat-sensitive element for rapid fire suppression)
•OEM Service：Accepted (customization available based on customer requirements for labels, packaging, etc.)
•Delivery Terms：FOB, CFR, CIF, EXW
•Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

UL/FM Fire Sprinkler

Enterprise Atlas:

Email:

linhaifeng117@gmail.com

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Product Details

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Product Formation

This sprinkler is officially certified by FM Global, a leading authority in fire safety standards, guaranteeing its compliance with strict quality and performance requirements. With a K-factor of 115 (corresponding to K-ZSTDY20 in the Chinese standard), it delivers a precise and efficient water flow rate to tackle fires effectively. The operating temperature is set at 68℃, meaning it activates promptly when the ambient temperature reaches this critical threshold, minimizing fire spread.​

Its concealed design allows it to be installed flush with the ceiling or wall, remaining unobtrusive and preserving the aesthetic integrity of spaces such as commercial buildings, hotels, shopping malls, and high-end residential areas. As a quick-response sprinkler, it features a heat-sensitive element that reacts faster than traditional sprinklers, reducing the time between fire detection and water discharge—this is crucial for limiting property damage and ensuring occupant safety. The product is engineered to work seamlessly with most automatic fire sprinkler systems, compatible with standard water supply pressures and piping configurations. It also undergoes rigorous testing to withstand harsh environmental conditions, including corrosion resistance and mechanical durability, ensuring long-term reliable operation.

KEY WORDS： FM Certified VK352 Sprinkler, K115-68℃ Concealed Sprinkler, K-ZSTDY20-68℃ Quick-Response Sprinkler, FM Approved Concealed Fire Sprinkler, 68℃ Activation Concealed Sprinkler, K115 K-Factor Fire Sprinkler, Quick-Response Concealed Fire Protection Device, China, manufacturers, suppliers, wholesale, factory

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Product Features

1.FM Certification: Meets the strict safety and performance standards of FM Global, ensuring global recognition and trust in fire protection effectiveness.​

2. Quick-Response Activation: Equipped with a fast-reacting heat-sensitive component that triggers water discharge rapidly at 68℃, accelerating fire suppression and reducing potential damage.​

3. Concealed Design: Installs flush with ceilings or walls, maintaining the visual appeal of indoor spaces without compromising fire safety functionality—ideal for aesthetic-sensitive areas like hotels, offices, and luxury residences.​

4. High K-Factor (K115/K-ZSTDY20): Delivers a sufficient water flow rate to cover larger areas or address more intense fire scenarios, enhancing its adaptability in diverse building layouts.​

5. Durable Construction: Built with corrosion-resistant materials and tested for mechanical stability, ensuring long service life and reliable performance even in challenging environmental conditions.

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Product Parameter

Model	VK352 / K-ZSTDY20-68℃
Product Type	FM Approved Concealed Sprinkler Head (Quick-Response)
Response Type	Quick-Response (QR)
Temperature Rating	68℃ (154.4℉), Glass Bulb Heat-Sensitive Element (Red Color Code)
K-Factor	K115
Inlet Size	DN20 (3/4 inch)
Response Time Index (RTI)	≤50 (meets NFPA 13 quick-response requirements)
Operating Pressure Range	0.1MPa - 1.2MPa (14.5psi - 174psi)
Flow Rate	Varies by pressure (e.g., ~36.3 GPM at 30psi, ~51.4 GPM at 60psi)
Spray Pattern	Full Cone Coverage (360°), Uniform Water Distribution
Installation Type	Concealed (Flush with Ceiling When Not Activated)
Material	Brass Body (Lead-Free), 304 Stainless Steel Cover, Borosilicate Glass Bulb
Concealment Depth	25mm - 45mm (Adjustable Based on Ceiling Thickness)
Finish	White Powder Coating (Customizable: Silver, Beige)
Application	Commercial Buildings, Shopping Malls, Hotels, Office Complexes, Residential Areas
Certification	FM Approved, UL Listed, ISO9001, GB 5135.1
Compliance Standards	NFPA 13, FM 1311, ANSI/UL 199
Product Dimensions	110mm × 85mm × 60mm (L × W × H, Including Concealment Cover)
Net Weight	0.38 kg

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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！