Viking MICROFAST VK303 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
1. DESCRIPTION
The Viking Microfast
®
small, thermosensitive, solder link spray sprinkler available with various 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 investigated 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: Class Series 2000
China Approval: Approved according to China GB standard
Refer to the Approval Chart(s) and Design Criteria for Listing and/or 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)
Factory tested hydrostatically to 500 psi (34.5 bar)
Thread size: 1/2" NPT, 15 mm BSPT
Nominal K-Factor: 5.6 U.S. (80.6 metric**)
Overall Length: 2-1/4" (58 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: QM Brass
Deflector: UNS-C23000 or Copper UNS-C19500
Fusible Link 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: (Also refer to the current Viking price list.)
Order Viking Microfast
kler 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) = G
For example, sprinkler VK303 with a 1/2" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 17536AC
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches:
A. Standard Wrench: Part No. 21475M/B (available since 2017).
B. Wrench for Recessed Pendent Sprinklers: Part No. 13655W/B** (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.
Form No. F_062514 Rev 02
Visit the Viking website for the latest edition of this technical data page.
Quick Response Fusible Link Pendent Sprinkler VK303 is a
Quick Response Fusible Link Pendent Sprinkler VK303 by first adding the appropriate suffix for the sprin-
®
April 2023
TECHNICAL DATA
MICROFAST QUICK
®
RESPONSE FUSIBLE
LINK PENDENT
SPRINKLER VK303 (K5.6)
Replaces Form No. F_062514 Rev 01
(added venting statement.)
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