Viking MICROFAST VK326 Technical Data Manual

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.
1. DESCRIPTION
The Viking Microfast
Sprinkler VK326 is a small, thermosensitive, solder link spray sprinkler
available in several different 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,
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
Refer to the Approval Chart(s) and Design Criteria for Listing and Approval re-
quirements 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
Nominal K-Factor: 2.8 U.S. (40 metric**)
Overall Length: 2-1/4" (58 mm)
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Brass UNS-C23000 or Copper UNS-C19500
Bushing: Brass UNS-C36000
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-ENT Plated, 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 VK326 with a 1/2" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 13956AB
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrench: Standard Wrench: Part No. 21475M/B; see Figure 1.
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_063014 21.03.05
Quick Response
®
the ENT coating has been investigated for installation
(Also refer to the current Viking price list.)
Quick Response Fusible Element Upright Sprinkler VK326 by first adding the appropriate suffix for the
®
Rev 21.1
TECHNICAL DATA
Upright Fusible Element
MICROFAST QUICK
®
RESPONSE FUSIBLE
ELEMENT UPRIGHT
SPRINKLER VK326 (K2.8)
Replaces Form No. F_063014 Rev 20.1
(Removed bushed part numbers)
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