Viking MICROFAST VK331 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
®
thermosensitive glass bulb spray sprinkler available with various finishes and
temperature ratings to meet design requirements. The special Polyester
Electroless Nickel PTFE (ENT) coatings can be used in decorative applications where
colors are desired. In addition, these coatings have been investigated for installation
in corrosive environments and are listed/approved as indicated in the Approval
Charts.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Refer to Approval Chart 1 and Design Criteria cULus Listing 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 BSPT
Nominal K-Factor: 4.2 U.S. (57 metric**)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-1/4" (58 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Phosphor bronze UNS-C51000, Copper UNS-C19500, or Brass UNS-C26000
Bushing: Brass UNS-C36000
Bulb: Glass, nominal 3 mm diameter
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Screw: Brass UNS-C36000
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
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 Viking Microfast
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: 135 °F (57 °C) = A, 155 °F (68 °C) = B, 175 °F (79 °C) = D, 200 °F (93 °C) = E, 286 °F (141 °C) = G
For example, sprinkler VK331 with a Brass finish and a 155 °F (68 °C) temperature rating = Part No. 06720BAB
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to 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.
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_061814 21.03.05
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Quick Response Pendent Sprinkler VK331 is a small
Quick Response Pendent Sprinkler VK331 by first adding the appropriate suffix for the sprinkler finish and
®
Rev 21.1
TECHNICAL DATA
and
Page 1 of 5
MICROFAST
®
QUICK RESPONSE
PENDENT SPRINKLER
VK331 (K4.2)
Replaces form F_061814 Rev. 20.1
(Removed bushed part numbers)