Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
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1. DESCRIPTION
Viking Institutional Style Sprinklers are small, flush, solder link and lever sprinklers
made with tamper-resistant construction. These flush-mount sprinklers can be
ordered as Quick Response, Quick Response-Extended Coverage, and as Pendent
or Horizontal Sidewall configurations. Additionally, the VK427 can be used as
Standard Response (FM only). Viking institutional sprinklers have been specifically
designed for use with concealed piping in institutional mental health occupancies,
correctional facilities, or anywhere a likelihood of tampering with fire sprinklers by
the occupants may exist.
The institutional sprinkler assembly consists of the sprinkler body and a 3 or 4 inch
escutcheon plate. The sprinkler and escutcheon plate are available with a polished
chrome or painted finish.
2. LISTINGS AND APPROVALS*
cULus Listed: Category VNIV
FM Approved: Class 2015 (VK427 ONLY)
* Refer to the Approval Charts and Design Criteria for requirements that must be followed.
NOTICE
THE VIKING CORPORATION DISCLAIMS ANY RESPONSIBILITY FOR
DAMAGES OR INJURY (INCLUDING DEATH) CAUSED BY THE OPERATION
OR INOPERATION OF SPRINKLERS ARISING OUT OF THE MISUSE OF OR
TAMPERING WITH VIKING BRAND SPRINKLERS INCLUDING, WITHOUT
LIMITATION, ANY PERSONAL INJURY OR DEATH ARISING OUT OF OR
CAUSED BY THE MANIPULATION OF, DISMANTLING OF, OR ATTEMPTED
USE OF THE SPRINKLER OR ANY COMPONENT AS AN INSTRUMENT
UNRELATED TO ITS INTENDED USE.
3. TECHNICAL DATA
Specifications:
Minimum Operating Pressure: 7 psi (0.5 bar)
Rated to: 175 psi (12 bar) water working pressure.
Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: 1/2" NPT or 15 mm BSPT
Nominal K-factor: 5.6 U.S. (80.6 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: QM Brass
Deflector: Pendent - Copper UNS-C23000 or UNS-C51000, HSW - Copper UNS-
C51000
Deflector Pins: Stainless Steel 302
Button: UNS-C36000
Compression Screw: Brass UNS-C36000
Fusible Link Assembly: UNS-C51910 and Eutectic Solder
Fusible Link Levers: Stainless Steel UNS-S31600
Lever Bar: Copper Alloy UNS-C72500
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with PTFE
Tape
Seat: UNS-C31400 or UNS-C31600 Bronze 1/2 to full hard
Pin Ring: Pendent - Copper UNS-C23000, HSW - Copper UNS-C51000
Ordering Information: (Refer to Table 1 and the current Viking List Price Book.)
Form No. F_032319
Rev 02
© 2023 Viking Group Inc. All rights reserved
TECHNICAL DATA
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
January 2023
INSTITUTIONAL SPRINKLERS K5.6
SIN
VK426
VK650
VK427
VK651
VK426
VK650
VK427
VK651
1. VK427 is FM Approved as Standard Response (SR)
(Added alternate deflector material; revised design criteria; removed UNS-C84400
Page 1 of 10
THREAD
DESCRIPTION
NPT
QR Pendent
NPT
QR EC Pendent
NPT
QR or SR
HSW
1
NPT
QR EC HSW
BSPT
QR Pendent
BSPT
QR EC Pendent
BSPT
QR or SR
HSW
1
BSPT
QR EC HSW
Replaces F_032319 Rev 01
)
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