Viking FREEDOM VK4840 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. DESCRIPTION
Viking Freedom Residential Horizontal Sidewall Lead Free* Sprinkler VK4840
®
is a small, thermosensitive, glass-bulb residential sprinkler available in several
different finishes and temperature ratings to meet varying design requirements.
The sprinkler orifice design, with a K-factor of 4.2 (57 metric
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.
* Lead content complies with the definition of 'Lead Free' established in the Reduction of Lead
in Drinking Water Act (S.3874) endorsed by AWWA's Water Utility Council, and California
Assembly Bill #1953.
2. LISTINGS AND APPROVALS
UL Listed (C-UL-US-EU): Category VKKW
UL Classified to: NSF/ANSI/CAN Standard 61, Drinking Water System
Components and NSF/ANSI 372 (MH48034).
Refer to the Approval Chart and Design Criteria for C-UL-US-EU Listing
requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2011.
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: 4.2 U.S. (57 metric
† Metric K-factor measurement shown is 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: 3" (76 mm)
Material Standards:
Frame Casting: Brass UNS-C89833
Deflector: Brass UNS-C23000
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: Brass UNS-C64200
Ordering Information: (Refer to the current Viking price list.)
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.
6. INSPECTIONS, TESTS AND MAINTENANCE
Refer to NFPA 25 for Inspection, Testing and Maintenance requirements.
7. AVAILABILITY
The Viking Model VK4840 Sprinkler is available through a network of domestic and international distributors. See The Viking
Corporation web site for the closest distributor or contact The Viking Corporation.
Form No. F_100510 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
)
†
May 2023
), allows efficient use
†
FREEDOM RESIDENTIAL
®
HORIZONTAL SIDEWALL
LEAD FREE SPRINKLER
VK4840 (K4.2)
Replaces Form No. F_100510 Rev 19.1
(revised UL approval statement.)
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