MicrofastHP
®
QUICK
RESPONSE FUSIBLE ELEMENT
UPRIGHT HIGH PRESSURE
SPRINKLER VK316 (K5.6)
TECHNICAL DATA
Page 1 of 3
Form No. F_062814 20.06.04 Rev 20.1
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
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 MicrofastHP
®
Quick Response Upright High Pressure Sprinkler VK316
is a small, thermosensitive, solder link spray sprinkler available in several differ-
ent finishes and temperature ratings to meet design requirements. The special
Polyester and Electroless Nickel PTFE (ENT) coatings can be used in decorative
applications where colors are desired. In addition, the ENT coating has been inves-
tigated for installation in corrosive environments and is listed/approved as indicated
in the Approval Chart.
2. LISTINGS AND APPROVALS
cULus Listed:
Category VNIV
Refer to the Approval Chart and Design Criteria on for cULus Listing requirements
that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)*
Maximum Working Pressure: 250 psi (17 bar) wwp.
Factory tested hydrostatically to 500 psi (34.5 bar)
Testing: U.S.A. Patent No. 4,831,870
Thread size: 1/2” NPT, 15 mm BSPT
Nominal K-factor: 5.6 U.S. (80.6 metric**)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-3/16” (56 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Brass UNS-C23000 or Copper UNS-C19500
Fusible Element Assembly: Nickel Alloy
Trigger and Support: Stainless Steel UNS-S31600
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Seat and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Screw: Brass UNS-C36000
For ENT Coated Sprinklers: Belleville Spring-Exposed, Screw and Pip Cap-ENT Coated
For Polyester Coated Sprinklers: Belleville Spring-Exposed
Ordering Information:
(Also refer to the current Viking price list.)
Order Viking Microfast
®
Quick Response Fusible Element Upright High Pressure Sprinkler VK316 by first adding the appropriate
suffix for the sprinkler finish and then the appropriate suffix for the temperature rating to the sprinkler base part number.
Finish Suffix: Brass = A, Chrome = F, White Polyester = M-/W, Black Polyester = M-/B, and ENT = JN
Temperature Suffix: 165 °F (74 °C) = C, 205 °F (96 °C) = E, and 280 °F (138 °C)
For example, sprinkler VK316 with a 1/2” NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 13953AB
Available Finishes And Temperature Ratings:
Refer to Table 1.
Accessories:
(Also refer to the Viking website.)
Sprinkler Wrench:
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 fusible element assembly disengages, releasing the seat and spring assemblies to open
the waterway. Water flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern to extinguish
or control the fire.
Replaces Form No. F_062814 Rev 19.1
(Removed Black PTFE.)
