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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 Quick Response Extended Coverage Concealed Horizontal Sidewall Sprinkler
VK638 is a thermosensitive spray sprinkler pre-assembled with a threaded adapter
for installation with a domed cover. The glass bulb operating element and special
deflector characteristics meet the challenges of quick response extended coverage
standards.
The cover plate provides up to 1/4" (6.35 mm) of horizontal adjustment and is avail-
able with 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. 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
finish work has been completed. The cover assembly can be removed and reinstalled,
allowing access behind the surface of the wall 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 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 require-
ments that must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2012.
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.
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length (Sprinkler Body): 2-3/4" (70 mm)
Covered by the following US Patent Nos: 7,854,269; 7,712,218; and 8,662,190
Material Standards:
Sprinkler Frame: Brass UNS-C84400
Flow Shaper: Brass UNS-C23000
Bulb: Glass, nominal 3 mm diameter
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Compression Screws: 18-8 Stainless Steel
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with Polytetrafluoroethylene (PTFE) Tape
Yoke: Phosphor Bronze UNS-C51000
Cover Adapter: Cold Rolled Steel UNS-G10080, Finish: Clear Chromate over Zinc Plating
Cover Assembly Materials:
Cover: Copper UNS-C11000
Base: Brass UNS-C26800
Springs: Nickel Alloy
Solder: Eutectic
Ordering Information: (Also refer to the current Viking price list.)
Viking QREC Concealed HSW Sprinkler VK638-D and Cover Plate Assembly must be ordered separately:
Sprinkler: Base Part No. 17375A-X for standard brass and 17375JN-X for ENT** - insert the desired temperature rating suffix where
the dash (-) is located (includes sprinkler and adapter pre-assembled, with a protective plastic cap covering the unit).
Specify sprinkler temperature rating by adding the appropriate suffix for the temperature rating to the base part number:
Temperature Suffixes: 135 °F (57 °C) = A, 155 °F (68 °C) = B, 175 °F (79 °C) = D, 200 °F (93 °C) = E
For example, sprinkler VK638 with a 175 °F (79 °C) temperature rating = 17375ADX.
**ENT is not available in 135 °F (57 °C).
Form No. F_082211
19.09.23
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
)
†
Rev 19.1
QREC CONCEALED HSW
SPRINKLER VK638-D (K8.0)
SPECIAL FEATURES:
For Light Hazard Occupancies Only
•
Designed for Corridor Applications
•
28' Maximum Width Spacing
•
Replaces Form No. F_082211 Rev 14.1.P65
Page 1 of 7
(Added ENT.)
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Related Manuals for Viking VK638-D
Summary of Contents for Viking VK638-D
- Page 1 Ordering Information: (Also refer to the current Viking price list.) Viking QREC Concealed HSW Sprinkler VK638-D and Cover Plate Assembly must be ordered separately: Sprinkler: Base Part No. 17375A-X for standard brass and 17375JN-X for ENT** - insert the desired temperature rating suffix where the dash (-) is located (includes sprinkler and adapter pre-assembled, with a protective plastic cap covering the unit).
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Page 2: Technical Data
Concealed Sprinkler VK638 and Cover 13501 Viking Sprinkler VK638 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. 8. GUARANTEE For details of warranty, refer to Viking’s current list price schedule or contact Viking directly. - Page 3 Footnotes Part number shown is the base part number. For complete part number, refer to current Viking price list schedule. Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
- Page 4 Footnotes Part number shown is the base part number. For complete part number, refer to current Viking price list schedule. Metric K-factor measurement shown is when pressure is measured in Bar. When pressure is measured in kPa, divide the metric K-factor shown by 10.0.
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Page 5: Design Criteria
Viking sprinklers are to be installed in accordance with the latest edition of Viking technical data, the appropriate standards of NFPA, FM Global, LPCB, APSAD, VdS or other similar organiza- tions, and also with the provisions of governmental codes, ordinances, and standards, whenever applicable. - Page 6 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 Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com Figure 4: Sprinkler Dimensions and Cover Installation...
- Page 7 SPRINKLER VK638-D (K8.0) 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 Visit the Viking website for the latest edition of this technical data page www.vikinggroupinc.com Figure 6: Sprinkler VK638 Installed Form No.
- Page 8 Refer to the appropriate technical data page and NFPA standards for complete care, handling, installation, and maintenance instructions. For additional product and system information Viking data pages and installation instructions are available on the Viking Web site at www.vikinggroupinc.com.
- Page 9 * Refer to the appropriate current technical data pages for complete care, handling, and installation instructions. Data pages are included with each shipment from Viking or Viking distributors. They can also be found on the Web site at www. vikinggroupinc.com.
- Page 10 • while ceiling finish work is being completed. Use only the designated Viking recessed sprinkler wrench (refer to the appropriate sprinkler data page) to install these sprinklers. NOTE: The protective cap is • temporarily removed during installation and then placed back on the sprinkler for protection until finish work is completed.
- Page 11 Take care not to crack the wax coating on the units. • For touching up the wax coating after installation, wax is available from Viking in bar form. Refer to Table 1 below. The coating MUST be repaired after •...
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Page 12: Listings And Approvals
1. DESCRIPTION Viking fire sprinklers consist of a threaded frame with a specific waterway or orifice size and a deflector for distributing water in a specified pattern. A closed or sealed sprinkler refers to a complete assembly, including the thermosensitive operating element. An open sprinkler does not use an operating element and is open at all times. - Page 13 TECHNICAL DATA SPRINKLER OVERVIEW 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 VERTICAL SIDEWALL (VSW) SPRINKLER: A sprinkler intended for installation near the wall and ceiling. The deflector provides a water spray pattern outward in a quarter-spherical pattern and can be installed in the upright or pendent position with the flow arrow in the direction of discharge.
- Page 14 Refer to NFPA 25 for Inspection, Testing and Maintenance requirements. 7. AVAILABILITY Viking sprinklers are available through a network of domestic and international distributors. See The Viking Corporation web site for the closest distributor or contact The Viking Corporation. 8. GUARANTEE For details of warranty, refer to Viking’s current list price schedule or contact Viking directly.
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Page 15: Warranty Terms And Conditions
For more information, go to www.P65Warnings.ca.gov 2. WARRANTY TERMS AND CONDITIONS For details of warranty, refer to Viking’s current list price schedule at www.vikinggroupinc.com or contact Viking directly. New Bulletin Form No. F_111218 18.11.15...