MicrofastHP
®
QUICK
RESPONSE UPRIGHT HIGH
PRESSURE SPRINKLER
VK340 (K2.8)
TECHNICAL DATA
Form No. F_062114 21.03.05 Rev 21.1
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.
1. DESCRIPTION
The Viking MicrofastHP
®
Quick Response Upright High Pressure Sprinkler
VK340 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
Charts.
2. LISTINGS AND APPROVALS
cULus Listed:
Category VNIV
Refer to Approval Chart 1 and Design Criteria on for cULus Listing requirements
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)
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
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 Pip Cap ENT Plated
Ordering Information:
(Also refer to the current Viking price list.)
Order Viking MicrofastHP
®
Quick Response Upright High Pressure Sprinkler VK340 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 VK340 with a 1/2” NPT thread, Brass finish and a 155 °F/68 °C temperature rating = Part No. 12286AB
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.
5. OPERATION
During fire conditions, the heat-sensitive liquid in the glass bulb expands, causing the glass to shatter, releasing the pip cap and
sealing spring assembly. Water flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern
to extinguish or control the fire.
Replaces Form No. F_062114 Rev 20.1
(Removed bushed part numbers)
For Light Hazard Occupancies Only
