Viking MICROFAST VK306 Bulletin

Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.
1. DESCRIPTION
The Viking Microfast
®
sensitive glass bulb spray sprinklers designed for installation in either the upright or pendent
position. The VK306 is available with finishes and temperature ratings to meet design require-
ments.
2. LISTINGS AND APPROVALS
FM Approved: Class 2012
Refer to the Approval Chart and Design Criteria for FM Approval requirements
that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Rated to 175 psi (12 bar) water working pressure.
Factory tested hydrostatically to 500 psi (34.5 bar)
Thread size: 1/2" NPT, 15 mm BSP
Nominal K-Factor: 5.6 U.S. (80.6 metric**)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-1/4" (58 mm)
** Metric K-factor measurement shown is in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Brass UNS-C23000
Bulb: Glass, nominal 3 mm diameter
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Screw: Brass UNS-C36000
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
For Polyester Coated Sprinklers: Belleville Spring-Exposed
Ordering Information: (Also refer to the current Viking price list.)
Order Quick Response Vertical Sidewall Sprinklers by first adding the appropriate suffix for the sprinkler finish and then the ap-
propriate suffix for the temperature rating to the sprinkler base part number.
Finish Suffix: Brass = A, and Chrome = F
Temperature Suffix: 135 °F (57 °C) = A, 155 °F (68 °C) = B, 175 °F (79 °C) = D, 200 °F (93 °C) = E, and 286 °F (141 °C) = G
For example, sprinkler VK306 with a 1/2" NPT thread, Brass finish and a 155 °F (68 °C) temperature rating = Part No. 12983AB
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the "Sprinkler Accessories" section of the Viking data book.)
Sprinkler Wrench:
A. Standard Wrench: Part No. 21475M/B (available since 2017).
Sprinkler Cabinets:
A. Six-head capacity: Part No. 01724A (available since 1971)
B. Twelve-head capacity: Part No. 01725A (available since 1971)
4. INSTALLATION
Refer to appropriate NFPA Installation Standards.
5. OPERATION
During fire conditions, the heat-sensitive liquid in the glass bulb expands, causing the glass to shatter, releasing the pip cap and
sealing spring assembly. Water flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern
to extinguish or control the fire.
6. INSPECTIONS, TESTS AND MAINTENANCE
Refer to NFPA 25 for Inspection, Testing and Maintenance requirements.
Form No. F_060614 18.10.18
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Vertical Sidewall Sprinkler VK306 is a small thermo-
Rev 17.1.P65
TECHNICAL DATA
Page 1 of 3
MICROFAST QUICK
®
RESPONSE VERTICAL
SIDEWALL SPRINKLER
VK306 (K5.6)
Replaces Form No. F_060614 Rev 17.1
(Added P65 Warning.)