Viking MICROFAST VK334 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
Sidewall Sprinkler VK334 is a 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
Charts.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Refer to Approval Chart 1 and Design Criteria for cULus Listing requirements 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)
Deflector (Sprinkler 13949): U.S.A. Patent No. 4,296,816
Thread Size: 1/2" (15 mm) NPT
Nominal K-Factor: 2.8 U.S. (40.3 metric*)
*Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Overall Length: 2-1/2" (64 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Phosphor Bronze UNS-C51000
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 and Pip Cap ENT Plated
Ordering Information: (Also refer to the current Viking price list.)
Order Quick Response Horizontal Sidewall Fusible Element Sprinkler VK334 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 = G
For example, sprinkler VK334 with a Brass finish and a 165 °F / 74 °C temperature rating = Part No. 13962AC
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches (see Figure 1):
A. Standard Wrench: Part No. 21475M/B (available since 2017).
B. Wrench for recessed sprinklers with protective shields: Part No. 13655W/B** (available since 2003)
**A ½" ratchet is required (not available from Viking).
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_071314 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Fusible
®
July 2023
Element Horizontal
MICROFAST QUICK
®
RESPONSE FUSIBLE
ELEMENT HSW SPRINKLER
VK334 (K2.8)
Replaces Form No. F_071314 Rev 21.1
(Updated material specifications.)
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