MICROFAST
®
QUICK
RESPONSE UPRIGHT
SPRINKLER VK327 (K4.2)
TECHNICAL DATA
Page 1 of 3
Form No. F_061514 21.03.05 Rev 21.1
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: [email protected]
Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.
1. DESCRIPTION
The Viking Microfast
®
Quick Response Upright Sprinkler VK327 is a small,
thermosensitive, glass-bulb 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, these coatings have been investigated for installation
in corrosive environments and are listed/approved as indicated in the Approval
Chart(s).
2. LISTINGS AND APPROVALS
cULus Listed:
Category VNIV
Refer to Approval Chart(s) 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) wwp.
Factory tested hydrostatic rating: 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 rating: -65 °F (-55 °C)
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).
Covered by the following US Patent No.: 4,831,870
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Brass UNS-C23000 or Copper UNS-C19500
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-ENT Plated, Pip Cap-ENT Coated
Ordering Information:
(Also refer to the current Viking price list.)
Order Viking Microfast
®
Quick Response Upright Sprinkler VK327 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 Suffixes: Brass = A, Chrome = F, White Polyester = M-/W, Black Polyester = M-/B and ENT = JN
Temperature Suffixes: 135 °F (57 °C) = A, 155 °F (68 °C) = B, 175 °F (79 °C) = D, 200 °F (93 °C) = E, and 286 F° (141 °C) = G
For example, sprinkler VK327 with a 1/2” NPT thread, Brass finish and a 155 °F (68 °C) temperature rating = Part No. 06719BAB
Available Finishes And Temperature Ratings:
Refer to Table 1.
Accessories:
(Also refer to the current Viking price list.)
Sprinkler Wrench:
Standard Wrench: Part No. 21475M/B (available since 2017)
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.
Replaces Form F_061514 Rev 20.1
(Removed bushed part numbers)
