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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.
1. DESCRIPTION
The Viking MicrofastHP
VK341 is a small, thermosensitive, solder link 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, the ENT coating has been investigated for installation in
corrosive environments and is listed/approved as indicated in the Approval
Charts.
2. LISTINGS AND APPROVALS
cULus Listed: Category VNIV
Refer to Approval Chart 1 and Design Criteria on for cULus Listing requirements.
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)
Testing: U.S.A. Patent No. 4,831,870
Thread size: 1/2" NPT, 15 mm BSPT
Nominal K-Factor: 2.8 U.S. (40.3 metric**)
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-3/16" (56 mm)
Material Standards:
Frame Casting: Brass UNS-C84400
Deflector: Brass UNS-C23000 or Copper UNS-C19500
Bushing: Brass UNS-C36000
Fusible Element Assembly: Nickel Alloy
Trigger and Support: Stainless Steel UNS-S31600
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Seat and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Screw: Brass UNS-C36000
For Polyester Coated Sprinklers: Belleville Spring-Exposed
For ENT Coated Sprinklers: Belleville Spring-Exposed, Screw and Pip Cap ENT Plated
Ordering Information:
Order Viking Microfast
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: 165 °F (74 °C) = C, 205 °F (96 °C) = E, and 280 °F (138 °C)
For example, sprinkler VK341 with a 1/2" NPT thread, Brass finish and a 165 °F (74 °C) temperature rating = Part No. 20992AB
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.
Form No. F_071414
21.03.05
Quick Response Upright High Pressure Sprinkler
®
(Also refer to the current Viking price list.)
Quick Response Fusible Element Upright High Pressure Sprinkler VK341 by first adding the appropriate
®
Rev 21.1
TECHNICAL DATA
MicrofastHP
QUICK
®
RESPONSE FUSIBLE ELEMENT
UPRIGHT HIGH PRESSURE
SPRINKLER VK341 (K2.8)
Replaces Form No. F_071114 Rev 20.1
(Removed bushed part numbers)
Page 1 of 3
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Summary of Contents for Viking MicrofastHP VK341
- Page 1 SPRINKLER VK341 (K2.8) 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. 1. DESCRIPTION The Viking MicrofastHP Quick Response Upright High Pressure Sprinkler ®...
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Page 2: Technical Data
Quick Response Upright High Pressure Sprinkler VK341 is available through a network of domestic and ® international distributors. See The Viking Corporation web site for the closest distributor or contact The Viking Corporation. 8. GUARANTEE For details of warranty, refer to Viking’s current list price schedule or contact Viking directly. - Page 3 Viking sprinklers are to be installed in accordance with the latest edition of Viking technical data, the appropriate standards of NFPA, FM Global, LPCB, APSAD, VdS or other similar organiza- tions, and also with the provisions of governmental codes, ordinances, and standards, whenever applicable.
- Page 4 Refer to the appropriate technical data page and NFPA standards for complete care, handling, installation, and maintenance instructions. For additional product and system information Viking data pages and installation instructions are available on the Viking Web site at www.vikinggroupinc.com.
- Page 5 * Refer to the appropriate current technical data pages for complete care, handling, and installation instructions. Data pages are included with each shipment from Viking or Viking distributors. They can also be found on the Web site at www. vikinggroupinc.com.
- Page 6 • while ceiling finish work is being completed. Use only the designated Viking recessed sprinkler wrench (refer to the appropriate sprinkler data page) to install these sprinklers. NOTE: The protective cap is • temporarily removed during installation and then placed back on the sprinkler for protection until finish work is completed.
- Page 7 Take care not to crack the wax coating on the units. • For touching up the wax coating after installation, wax is available from Viking in bar form. Refer to Table 1 below. The coating MUST be repaired after •...
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Page 8: Warranty Terms And Conditions
For more information, go to www.P65Warnings.ca.gov 2. WARRANTY TERMS AND CONDITIONS For details of warranty, refer to Viking’s current list price schedule at www.vikinggroupinc.com or contact Viking directly. New Bulletin Form No. F_111218 18.11.15...