Viking VK680 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 QREC Concealed Horizontal Sidewall Sprinkler VK680 is a small high-sensitivity
solder link and lever sprinkler designed for installation on concealed pipe systems,
where the appearance of a smooth wall is desired. The fast response operating
element and special flow shaper characteristics meet the challenges of quick response
extended coverage standards.
The sprinkler is hidden from view by a low profile, small diameter cover plate installed
flush to the wall. The cover plate is available in several decorative finishes to meet
design requirements. The two-piece design allows installation and testing of the
sprinkler prior to installation of the cover plate. After the system has been tested and
wall finish has been applied, the push-on design of the cover plate assembly allows
easy installation of the cover plate with up to 1/4" (6.4 mm) adjustment.
The Electroless Nickel PTFE (ENT) coating has been investigated for installation in
corrosive environments and is listed and approved 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
cULus Listed: Category VNIV
Refer to the Approval Chart and Design Criteria for cULus Listing requirements that
must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2011.
Minimum Operating Pressure: 7 psi (0.5 bar)
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: 8.0 U.S. (115.2 metric
* Metric K-factor measurement is in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
Available Cover Plate Horizontal Adjustment: 1/4" (6.4 mm)
Overall Length (Sprinkler Body): 2" (50.8 mm)
Patents Pending
Material Standards:
Sprinkler Body: QM brass or brass UNS-C84400
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE tape
Seat: UNS-C31400 or UNS-C31600, ENT coating available upon request
Deflector Ring: Brass UNS-C23000
Deflector Pins: Stainless steel UNS-S30200
Halo: Phosphor bronze UNS-C51000, e-coating available upon request
Flow Shaper: Phosphor Bronze UNS-C51000
Lever Bar Ring: Brass UNS-C84400 or UNS-C31600
Compression Screw: 18-8 Stainless Steel
Fusible Link Assembly: Nickel Alloy and Eutectic Solder
Fusible Link Levers: Stainless Steel UNS-S31600
Guide Pin: Stainless Steel UNS-S43000, ENT coating available upon request
Shipping Cap: Polyethylene
Cover Assembly Materials:
Cover Plate Assembly: Copper UNS-C11000 and brass UNS-C26800
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 its operating temperature, the cover plate detaches.
Continued heating of the exposed sprinkler causes the fusible element to disengage, releasing the sealing assembly. Water flowing
through the sprinkler orifice strikes the flow shaper, 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.
Form No. F_050611 Rev 01
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
)
*
September 2023
QUICK RESPONSE
EXTENDED COVERAGE
CONCEALED HSW
SPRINKLER VK680 (K8.0)
For Light Hazard Occupancies Only
Replaces Form No. F_050611 Rev 22.2
(Updated 135F cover plate temp. to 139F.)
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