FREEDOM®RESIDENTIAL
CONCEALED PENDENT
SPRINKLER VK494 (K4.9)
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
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Form No. F_012116 Rev 01 September 7, 2022
1. DESCRIPTION
Viking Freedom® Residential Concealed Pendent Sprinkler VK494 is a small
thermosensitive, glass-bulb residential sprinkler designed for installation on
concealed pipe systems where the appearance of a smooth ceiling is desired. The
orifice design allows the sprinkler’s efficient use of available water supplies for the
hydraulically designed fire-protection system. The glass bulb operating element
and special deflector characteristics meet the challenges of residential sprinkler
standards.
Features:
• K4.9 (70.6 metric)
• Fast response glass bulb operating element.
• Integral threaded adapter cup accepts push-on or thread-on cover plates.
• Low-profile, small diameter, removeable cover plates offer almost flush
appearance upon installation and allow ease of maintenance.
• Protective cap prevents damage during installation and finishing and keeps
errant overspray from coating internal parts.
• Various finishes available to meet design requirements.
• Optional Electroless Nickel PTFE (ENT) coating provides corrosion resistance
(see Approval Chart).
2. LISTINGS AND APPROVALS
cULusEU Listed: Category VKKW
Refer to the Approval Charts and Design Criteria for C-UL-US-EU Listing
requirements that must be followed.
3. TECHNICAL DATA
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: 1/2” (15 mm) NPT
Nominal K-factor: 4.9 U.S. (70.6 metric*)
Glass-bulb fluid temperature rating: to -65 °F (-55 °C)
* Metric K-factor measurement shown is in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Sprinkler Body: Brass UNS-C84400 or QM Brass
Deflector: Phosphor Bronze UNS-C51000
Deflector Pins: Stainless Steel UNS-S30200
Button: Brass UNS-C36000
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Compression Screw: 18-8 Stainless Steel
Yoke: Phosphor Bronze UNS-C51000
Belleville Spring Sealing Assembly: Beryllium Nickel Alloy, coated on both sides with PTFE Tape
Cover Adapter: Cold Rolled Steel JIS G3141 and Carbon Steel UNS-G10100 (per JIS G3141)
Shipping Cap: High Density Polyethylene
Vibration damper ring: Buna-N Rubber SAE AS-568-017
Cover Plate Assembly: Copper UNS-C11000 and Brass UNS-C26800 or Stainless Steel UNS-S30400
Spring: Beryllium Nickel
Solder: Eutectic
4. INSTALLATION
Refer to appropriate NFPA Installation Standards.
5. OPERATION
During fire conditions, when the temperature around the sprinkler approaches the cover plate’s nominal temperature rating, the
cover plate detaches and releases the deflector. Continued heating of the exposed sprinkler causes the heat-sensitive liquid in the
glass bulb to expand. When the temperature reaches the sprinkler’s nominal temperature rating, the glass bulb shatters releasing
the yoke, pip cap assembly and sealing spring. Water begins flowing through the sprinkler orifice and strikes the deflector form-
ing a uniform spray pattern over a specific area of coverage, which is determined by the water supply pressure at the sprinkler, in
order to extinguish or control the fire.
Sprinkler Body Brass UNS-C84400 or QM Brass
Deector Phosphor Bronze UNS-C51000
Deector Pins Stainless Steel UNS-S30200
Buon Brass UNS-C36000
Pip Cap and Insert Assembly Copper UNS-C11000 and Stainless Steel UNS-S30400
Compression Screw 18-8 Stainless Steel
Yoke Phosphor Bronze UNS-C51000
Belleville Spring Sealing Assembly Beryllium Nickel Alloy, coated on both sides with PTFE Tape
Cover Adapter Cold Rolled Steel UNS-G10080 with Clear Chromate over Zinc Plang
Shipping Cap High Density Polyethylene
Replaces Form No. F_012116 Rev 21.2
(Updated UL cover plate temperature rating; corrected sprinkler base part number.)
