Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
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1. DESCRIPTION
Viking Freedom® Residential Concealed Pendent Sprinkler VK495 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:
•
K3.7 (53.3 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 ceiling 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
cULus Listed: Category VKKW
Refer to the Approval Charts and Design Criteria on for CULus 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: 1/2" (15 mm) NPT
Nominal K-Factor: 3.7 U.S. (53.3 metric*)
Glass-bulb fluid temperature rated 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.
Material Standards:
Sprinkler Body: Brass UNS-C84400 or DZR 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 Materials:
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. Also refer to the instructions and figures in this document.
Form No. F_041623
Rev 02
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
August 2023
FREEDOM
RESIDENTIAL
®
CONCEALED PENDENT
SPRINKLER VK495 (K3.7)
Replaces F_041623 Rev 01
(added design criteria)
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