DN15-68℃ Closed-Type Medium-Speed Water Mist Sprinkler Head K60/150° Fire Sprinkler Head

DN15 - 68℃ Closed Medium Velocity Water Mist Nozzle K60/150° is a key component in fire automatic sprinkler systems, designed for specific scenarios. It combines reliable thermal sensitivity with efficient water mist fire control capabilities.
It is particularly suitable for protecting hazardous areas with flammable liquids, gases, and solids that have a flash point below 66°C. It is commonly deployed in industrial settings such as power plant equipment, large transformers, cable tunnels, and oil or gas storage tanks, and can also be used for protecting various vertical, horizontal, or irregular exposed equipment surfaces. Additionally, some of these sprinklers can be adapted to deluge systems by removing components like glass bulbs, and can also be integrated with other fire protection systems, such as dry powder extinguishing systems, to further enhance the reliability of fire protection.

● Product Type：Closed - type medium - speed water mist sprinkler
● Operating Temperature：68℃±3℃
● Nominal Size (DN)：DN15
● Temperature - sensitiv： Element Red 68℃ glass bulb
● Connection Method：Threaded Connection
● Operating Pressure Range：0.05MPa ~ 1.2MPa
● Rated Working Pressure (P)：0.1MPa
● OEM Service：Accepted
● Delivery Terms：FOB, CFR, CIF, EXW
● Payment Mode：T/T, L/C, PayPal, Western Union

Product category:

Foam fire sprinkler

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Product Details

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Product Formation

The DN15-68℃ closed medium-speed water mist nozzle (Model: K60/150°) is a key component widely used in automatic sprinkler systems, primarily designed to control or extinguish incipient fires and achieve area coverage and cooling through medium-speed water mist. Its formation process integrates precision design, material selection, and process control.

Under normal monitoring conditions, the nozzle remains closed, with pressurized water in the pipeline locked by the thermal element (glass bulb). When a fire occurs in the protected area and the ambient temperature rises to 68°C, the glass bulb ruptures due to thermal expansion, rendering the thermal element ineffective. The nozzle body is then released from restraint and opens under water pressure. The pressurized water flows rapidly through the nozzle, forming medium-speed water mist through internal channel cutting and collision. After being dispersed by the deflector, it sprays in a 150° fan-shaped pattern, covering the area below to achieve fire suppression or cooling protection.

The DN15-68°C closed medium-speed water mist nozzle (K60/150°) has become a reliable medium-speed water mist discharge unit in fire protection systems through precise structural design, corrosion-resistant material selection, and strict process control. It is suitable for various scenarios that require a balance between coverage range, cooling efficiency, and equipment protection, serving as an important carrier of modern automatic sprinkler technology.

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Other Classifed Products：

Fire Hose Categories, Fire Sprinkler System, Fire Protection Valve , Fire Hose Reel&Cabinet , Fire Foam Equipment，Fire Nozzle and Fire Monitor , Fire Hydrant , UL/FM Fire Fighting Equipment , Brass Valve Categories , Fire Extinguisher Series .

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Product Features

DN15-68°C Closed-Type Medium-Velocity Water Mist Nozzle (Model: K60/150°) is a critical component in automatic fire sprinkler systems, featuring the following characteristics:

Closed-Type Locking Mechanism: Equipped with a standard closed structure, the nozzle uses a 68°C thermal-responsive glass bulb (red indicator) to secure the deflector during normal operation, preventing pressurized water leakage from the pipeline. Only when ambient temperature reaches 68°C (±3°C) does the glass bulb shatter due to thermal expansion, triggering immediate nozzle activation—eliminating risks of "constant discharge" or "false triggering," making it ideal for long-term stable fire protection systems.
Standardized Thermal Element: Aligned with the internationally recognized 68°C response threshold, it complies with regulatory standards and suits typical building environments (e.g., malls, offices, light industrial facilities). This ensures immunity to temperature fluctuation-induced false alarms while avoiding delayed response during fires.
Precision Medium-Velocity Mist Droplets: Internal helical grooves/orifices shear water flow to produce medium-velocity mist with a controlled droplet size distribution (Dv0.95=50–200μm; "medium-velocity" refers to moderate droplet speed, distinct from high-velocity impact sprays). Compared to high-velocity mists (e.g., K≥115 nozzles), impact force is reduced by over 50%, minimizing water damage to sensitive assets like electronics, artifacts, or shelved goods. Unlike fine mists (<50μm), it operates without high-pressure pumps, lowering system costs.
Corrosion- and Aging-Resistant Construction: Nozzle bodies use brass (or stainless steel) with nickel-chromium electroplating, passing ≥96-hour salt spray tests without corrosion. Suitable for humid areas (e.g., underground garages, cold storage) or mildly corrosive zones (e.g., near kitchen exhaust ducts).
Broad Hazard-Level Compatibility: The 68°C activation temperature and K60 flow coefficient suit "Light Hazard" and "Ordinary Hazard I" spaces (offices, hotel rooms, hospital corridors, retail stores) and provide localized protection in "Ordinary Hazard II" areas (e.g., electrical rooms, server room entrances).

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Product Parameter

Parameter Item	Specification/Value/Description
Product Type	Closed - type medium - speed water mist sprinkler
Operating Temperature	68℃±3℃
Nominal Size (DN)	DN15
Temperature - sensitive Element	Red 68℃ glass bulb
Connection Method	Threaded Connection
Operating Pressure Range	0.05MPa ~ 1.2MPa
Rated Working Pressure (P)	0.1MPa
Flow Rate (Q)	At 0.1MPa: 6L/min; at 0.2MPa: 8.5L/min; at 0.3MPa: 10.4L/min
Pressure Test	Static pressure holding test at 1.2MPa for 3min, no leakage, deformation or rupture

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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！