Viking MicrofastHP VK344 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 MicrofastHP® Quick Response Horizontal High Pressure Sidewall
Sprinkler VK344 is
available with various finishes and temperature ratings to meet design
requirements. The special Polyester, 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 for cULus Listing require-
ments that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Maximum Working Pressure: 250 psi (17 bar) wwp
Factory tested hydrostatically to 500 psi (34.5 bar)
Nominal K-Factor: 2.8 U.S. (40.3 metric*)
Thread size: 1/2" NPT, 15 mm BSPT
* 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.
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-3/4" (68 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: 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: Copper UNS-C11000 and Stainless Steel UNS-S30400
Pip Cap Attachment: Brass UNS-C36000
For Polyester Coated Sprinklers: Belleville Spring-Exposed
For PTFE Coated Sprinklers: Belleville Spring-Exposed, Screw-Nickel Plated, Pip Cap PTFE Coated
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 MicrofastHP® Quick Response Horizontal Sidewall Sprinkler VK344 by first adding the appropriate suffix for the sprin-
kler 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, Black PTFE = N, 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 VK344 with a Brass finish and a 155 °F/68 °C temperature rating = Part No. 12287AB
Available Finishes And Temperature Ratings: Refer to Table 1.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches:
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_080688 21.03.05
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
a small thermosensitive glass bulb spray sprinkler
and Electroless Nickel PTFE
Rev 21.1
MicrofastHP QUICK
®
RESPONSE HORIZONTAL
SIDEWALL HIGH PRESSURE
SPRINKLER VK344 (K2.8)
Replaces Form F_080688 Rev 19.2
(Removed bushed part numbers)
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