MICROFAST
®
QUICK
RESPONSE UPRIGHT
SPRINKLER VK3271 (K4.2)
TECHNICAL DATA
Page 1 of 3
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.
Form No. F_061614 18.11.05 Rev 17.2.P65
1. DESCRIPTION
The Viking Microfast
®
Quick Response Upright Sprinkler VK3271 is a small,
thermosensitive, glass-bulb spray sprinkler available in several different finishes
and temperature ratings to meet design requirements. The special Polyester
coatings can be used in decorative applications where colors are desired. In
addition, these coatings have been investigated for installation in corrosive
atmospheres and are listed as corrosion resistant as indicated in the Approval
Charts.
2. LISTINGS AND APPROVALS
VdS approved:
Certificate: G4930039
CE certified:
Standard EN 12259-1, EC-certificate of conformity 0786-
CPD-40131
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)*
Maximum Working Pressure: 175 psi (12 bar) wwp.
Factory tested hydrostatically to 500 psi (34.5 bar)
Testing: U.S.A. Patent No. 4,831,870
Thread size: 10 mm BSP
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)
*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: 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
Pip Cap Attachment: Brass UNS-C36000
For Polyester Coated Sprinklers:
Belleville Spring-Exposed
Ordering Information:
(Also refer to the current Viking price list.)
Order Viking Microfast
®
Quick Response Upright Sprinkler VK3271 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, and Black Polyester = M-/B
Temperature Suffix (°F/°C): 135°/57° = A, 155°/68° = B, 175°/79° = D, 200°/93° = E, and 286°/141° = G
For example, sprinkler VK3271 with a 1/2” NPT thread, Brass finish and a 155 °F/68 °C temperature rating = Part No. 06931BAB
Available Finishes And Temperature Ratings:
Refer to Table 1.
Accessories:
(Also refer to the Viking website.)
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 No. F_061614 Rev 17.2
(Added P65 Warning.)
