Viking MICROFAST VK353 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 with various fin-
ishes and temperature ratings to meet design requirements. The special Polyester
and Polytetrafluoroethelyne (PTFE) coatings can be used in decorative applica-
tions where colors are desired.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
FM Approved: Class Series 2000
Refer to Approval Chart 1 and Design Criteria cULus Listing requirements, and
refer to Approval Chart 2 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, 3/4" NPT, 20 mm BSP
Nominal K-Factor: 8.0 U.S. (115.2 metric**)
Overall Length: 2-5/16" (59 mm)
*cULus Listing, FM Approval, and NFPA 13 installs require a minimum of 7 psi (0.5 bar). The minimum operating pressure for LPCB and CE
Approvals ONLY is 5 psi (0.35 bar).
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Phosphor Bronze UNS-C51000 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 PTFE Coated Sprinklers: Belleville Spring-Exposed, Screw-Nickel Plated, Pip Cap-PTFE Coated
For Polyester Coated Sprinklers: Belleville Spring-Exposed
Ordering Information: (Also refer to the current Viking price list.)
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 Black PTFE = N
Temperature Suffix: 165 °F (74 °C) = C, 205 °F (96 °C) = E, and 280 °F (138 °C)
For example, sprinkler VK353 with a 3/4" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 18274AC
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches:
A. Standard Wrench: Part No. 21475MB (available since 2017).
B. Wrench for Recessed Pendent Sprinklers: Part No. 13655WB** (available since 2006)
C. Optional Protective Sprinkler Cap Remover/Escutcheon Installer Tool*** Part No. 15915 (available since 2010)
**A ½" ratchet is required (not available from Viking).
***Allows use from the floor by attaching a length of 1" diameter CPVC tubing to the tool. Ideal for sprinkler cabinets. Refer to Bulletin F_051808.
Sprinkler Cabinets:
A. Six-head capacity: Part No. 01724A (available since 1971)
B. Twelve-head capacity: Part No. 01725A (available since 1971)
Form No. F_071814 19.02.21 Rev 19.1
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Fusible Element Pendent Sprinkler VK353
Quick Response Fusible Element Pendent Sprinkler VK353 by first adding the appropriate suffix for the
®
TECHNICAL DATA
MICROFAST
®
RESPONSE FUSIBLE
ELEMENT PENDENT
SPRINKLER VK353 (K8.0)
NOTE: As of May 2018 all logos have been removed from
the wrench boss.
Replaces Form No. F_071814 Rev 18.1.P65
(Removed F-1 Escutcheon.)
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