MICROFAST
®
QUICK
RESPONSE CONVENTIONAL
SPRINKLER VK354 (K8.0)
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: techsvcs@vikingcorp.com
Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com.
Form No. F_033214 18.11.05 Rev 18.3.P65
1. DESCRIPTION
The Viking Microfast
®
Quick Response Conventional (Old Style) Sprinkler
VK354 is a small, thermosensitive, glass-bulb spray sprinkler available in sev-
eral different finishes, temperature ratings, and K-Factors to meet design re-
quirements. 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 atmospheres
and are listed/approved as corrosion resistant as indicated in the Approval
Charts.
2.
LISTINGS AND APPROVALS
cULus Listed:
Category VNIV
LPCB Approved:
Certificate 096e/03
CE Certified:
Standard EN 12259-1, EC-certificate of constancy of performance 0832-CPR-S0021
MED Certified:
Standard EN 12259-1, EC-certificate of conformity 0832-MED-1003
NOTE:
Other International approval certificates are available upon request.
Refer to Approval Chart 1 and Design Criteria for cULus Listing requirements.
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: 3/4” NPT, 20 mm BSP
Nominal K-Factor: 8.0 U.S. (115.2 metric**)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-5/16” (59 mm)
*cULus Listing 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).
** Metric K-factor measurment shown is in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Brass UNS-C26000
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 Pipcap-ENT plated
Ordering Information:
(Also refer to the current Viking price list.)
Order Viking Microfast
®
Quick Response Conventional (Old Style) Sprinkler VK354 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 (°F/°C): 135°/57° = A, 155°/68° = B, 175°/79° = D, 200°/93° = E, and 286°/141° = G
For example, sprinkler VK354 with a 3/4” thread, Brass finish and a 155 °F/68 °C temperature rating = Part No. 18261AB
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)
Replaces Form No. F_060714 Rev 18.3
(Added P65 Warning.)
NOTE: As of May 2018 all logos have been removed from
the wrench boss.
