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
1. DESCRIPTION
Viking Freedom
Residential Concealed Pendent Sprinkler VK474 is a small
®
high-sensitivity solder link and lever residential sprinkler designed for installation on
concealed pipe systems where the appearance of a smooth ceiling is desired. The
orifice design, with a K-Factor of 5.8 (83.6 metric*), allows the sprinkler's efficient
use of available water supplies for the hydraulically designed fire-protection sys-
tem. The fast response operating element and special deflector combine speed of
operation and areas of coverage to meet residential sprinkler standards.
The sprinkler is pre-assembled with a threaded adapter for installation with a
low-profile small-diameter cover assembly installed flush to the ceiling. The two-
piece design allows installation and testing of the sprinkler prior to installation of
the cover plate. The "push-on", "thread-off" design of the concealed cover plate
assembly allows easy installation of the cover plate after the system has been
tested and the ceiling finish has been applied, while also providing up to ½" (12.7
mm) of vertical adjustment. The cover assembly can be removed and reinstalled, allowing temporary removal of ceiling panels
without taking the sprinkler system out of service or removing the sprinkler. 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
Charts. The ENT finish is only available for the sprinkler assembly, the cover plate is not plated.
2. LISTINGS AND APPROVALS
UL Listed (C-UL-US-EU): Category VKKW
Refer to the Approval Charts on pages and Design Criteria for C-UL-US-EU Listing requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2009.
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: 5.8 U.S. (83.6 metric*)
* 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 QM Brass
Deflector: Phosphor Bronze UNS-C51000
Deflector Pins: Stainless Steel UNS-S30200
Button: Brass UNS-C36000
Seat Assembly: Copper UNS-C31600
Compression Screw: Brass UNS-C36000
Fusible Element Assembly: Beryllium Nickel, coated with black acrylic paint
Levers: Stainless Steel UNS-S31600
Lever Bar: Copper Alloy UNS-C72500
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE Tape
Cover Adapter: Cold Rolled Steel UNS-G10080, Finish: Clear Chromate over Zinc Plating
Shipping Cap: Polyethylene
Cover Plate Materials:
Cover Plate Assembly: Copper UNS-C11000 and Brass UNS-C26800
Spring: Beryllium Nickel
Solder: Eutectic
Ordering Information: (Also refer to the current Viking price list.)
Viking Freedom
Residential Concealed Pendent Sprinkler VK474 and Cover Plate Assembly must be ordered separately:
®
Sprinkler: Base part number 15790.
Finish suffix: Brass = A and ENT = JN
Temperature suffix: 165 °F (74 °C) = C and 205 °F (96 °C) = E
Form No. F_012109
18.10.11
TECHNICAL DATA
Rev 16.1.P65
FREEDOM
RESIDENTIAL
®
CONCEALED PENDENT
SPRINKLER VK474 (K5.8)
Viking Technical Data may be found on
The Viking Corporation's Web site at
http://www.vikinggroupinc.com.
The Web site may include a more recent
edition of this Technical Data Page.
Replaces Form No. F_012109 Rev 16.1
(Added P65 Warning)
Page 1 of 8
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