Viking MICROFAST VK351 Technical Data Manual

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
®
is a small, thermosensitive, solder link spray sprinkler available in several differ-
ent finishes and temperature ratings to meet design requirements. The special
, and Electroless Nickel PTFE (ENT)
Polyester
applications where colors are desired. In addition, the ENT coating has been investi-
gated for installation in corrosive environments and is Listed/Approved as indicated
in the Approval Chart(s).
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
FM Approved: Classes 2002 and 2020
CE: Standard EN 12259-1, DOP_VK351_18-11-19
Refer to the Approval Chart(s) and Design Criterion for listing and approval
requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)*
Maximum Working Pressure: 175 psi (12 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, 3/4" NPT, 20 mm BSPT
Nominal K-factor: 8.0 U.S. (115.2 metric**)
Overall Length: 2-5/16" (58 mm)
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Phosphor Bronze UNS-C51000 or Brass UNS-C23000
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 Polyester Coated Sprinklers: Belleville Spring-Exposed
For ENT Coated Sprinklers: Belleville Spring-Exposed, Screw and Pip Cap-ENT Coated
Ordering Information:
Order Viking Microfast
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 VK351 with a 3/4" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 18275AB
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.
Form No. F_071714 Rev 01
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Upright Fusible Element Sprinkler VK351
coatings can be used in decorative
(Also refer to the current Viking price list.)
Quick Response Fusible Element Upright Sprinkler VK351 by first adding the appropriate suffix for the
®
August 2023
TECHNICAL DATA
MICROFAST QUICK
®
RESPONSE FUSIBLE
ELEMENT UPRIGHT
SPRINKLER VK351 (K8.0)
Replaces Form No. F_071714 Rev 20.2
(Updated material specifications)
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