Viking FREEDOM VK458 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. PRODUCT DESCRIPTION
Viking Freedom Residential Pendent Sprinkler VK458 is a small, thermosensitive,
®
glass-bulb residential sprinkler available in several different finishes and tempera-
ture ratings to meet varying design requirements. The Electroless Nickel PTFE
(ENT) coating has been investigated for installation in corrosive atmospheres and
is C-UL-US-EU Listed as corrosion resistant as indicated in the Approval Chart.
The sprinkler orifice design, with a K-Factor of 7.4 (107 metric*), allows efficient
use of available water supplies for the hydraulically designed fire-protection sys-
tem. The glass bulb operating element and special deflector characteristics meet
the challenges of residential sprinkler standards.
During fire conditions, the heat-sensitive liquid in the glass bulb expands, caus-
ing the glass to shatter, releasing the pip cap and sealing spring assembly. Water
flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uni-
form spray pattern to extinguish or control the fire.
2. LISTINGS AND APPROVALS
UL Listed (C-UL-US-EU): Category VKKW
Refer to the Approval Chart and Design Criteria for C-UL-US-EU Listing requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: Refer to the Approval Chart.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 3/4" (20 mm) NPT
Nominal K-Factor: 7.4 U.S. (107 metric*)
* Metric K-factor measurement is shown 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: 2-5/16" (59 mm)
Material Standards:
Frame Casting: Brass UNS-C84400 or QM Brass
Deflector: Brass UNS-C26000, Brass UNS-C23000, or Phosphor Bronze UNS-C51000
Bulb: Glass, nominal 3 mm diameter
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Compression Screw: Brass UNS-C36000
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNSS30400
For ENT coated sprinklers: Belleville spring - Exposed, Screw and Pipcap - ENT plated.
Available Finishes And Temperature Ratings:
Refer to Table 1.
Ordering Instructions: (Also refer to the current Viking price list.)
Sprinkler: Base Part No. 13230
Order sprinkler VK458 by first adding the appropriate suffix for the sprinkler finish and then the appropriate suffix for the tempera-
ture 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): 155°/68° = B, 175°/79° = D
For example, sprinkler VK458 with a Brass finish and a 155 °F/68 °C temperature rating = Part No. 13230AB.
Accessories: (Also refer to the Viking website.)
Sprinkler Wrenches:
A. Standard Wrench: Part No. 21475M/B (available since 2017)
B. Wrench for recessed sprinklers: Part No. 13577W/B** (available since 2006)
**A ½" ratchet is required (not available from Viking).
Form No. F_042005 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
November 2022
FREEDOM RESIDENTIAL
®
PENDENT SPRINKLER
VK458 (K7.4)
Replaces Form No. F_042005 Rev 17.1.P65
(Removed F-1 Escutcheon.)
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