QUICK RESPONSE
EXTRA-LARGE ORIFICE
UPRIGHT SPRINKLER
VK531 (STORAGE-DENSITY/AREA)
TECHNICAL DATA
Form No. F_120699 18.10.11 Rev 18.2.P65
Page 1 of 5
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: [email protected]
Visit the Viking website for the latest edition of this technical data page: www.vikinggroupinc.com
1. DESCRIPTION
The Viking Quick Response Extra-Large Orifice Upright Sprinkler VK531 is a ther-
mosensitive glass bulb spray sprinkler available in several different finishes and
temperature ratings to meet design requirements. The special Polyester, Electroless
Nickel PTFE (ENT), and PTFE coatings can be used in decorative applications where
colors are desired. In addition, these coatings have been investigated for installa-
tion in corrosive environments and are listed/approved as indicated in the Approval
Charts.
The extra-large orifice provides greater flows at lower pressures than standard
orifice or large orifice sprinklers. This feature allows reduced pipe sizing for hy-
draulically calculated sprinkler systems, which require high densities of water.
Viking Standard Response Extra-Large Orifice Sprinklers may eliminate the
need for a fire pump or reduce the size of the pump if it is required. On existing
systems, replacing large orifice sprinklers with extra-large orifice sprinklers may
provide the higher densities required to allow an increase in the hazard classifica-
tion of an occupancy.
Viking Quick Response Extra-Large Orifice Upright Sprinkler VK531 may be
ordered and/or used as an open sprinkler (glass bulb and pip cap assembly re-
moved) on deluge systems. Refer to
Ordering Instructions
below.
2. LISTINGS AND APPROVALS
cULus Listed:
Category VNIV
FM Approved:
Class 2020
VdS Approved:
Certificate G413059, G413060
LPCB Approved:
Certificate 096e/14
Refer to Approval Chart 1 and Design Criteria on page 3 for cULus Listing requirements, and refer to Approval Chart 2 and Design
Criteria on page 4 for FM Approval requirements that must be followed.
3. TECHNICAL DATA
Specifications:
Available since 2000.
Maximum Working Pressure: 175 psi (12 bar). Factory tested hydrostatically to 500 psi (34.5 bar).
Thread size: See Approval Charts
Nominal K-Factor: 11.2 U.S. (161.3 metric
*
)
* 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.
Glass-bulb fluid temperature rated to -65 °F (-55 °C)
Overall Length: 2-5/16” (58.7 mm)
Material Standards:
Sprinkler Frame: Brass UNS-C84400
Deflector: Brass UNS-C26000
Bulb: Glass, nominal 3 mm diameter
Pip Cap and Insert Assembly: Copper UNS-C11000 and Stainless Steel UNS-S30400
Compression Screw: Brass UNS-C36000
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with Teflon Tape
For Polyester Coated Sprinklers:
Belleville Spring-Exposed
For ENT Coated Sprinkler: Belleville Spring-Exposed, Screw and Pipcap-ENT plated.
Ordering Information:
(Also refer to the current Viking price list.)
Order Quick Response Extra-Large Orifice Upright Sprinkler VK531 by first adding the appropriate suffix for the sprinkler finish
and then the appropriate suffix for the temperature rating to the sprinkler base part number.
Replaces Form No. F_120699 Rev 18.2
(Added P65 Warning.)
NOTE: As of May 2018 all logos have been removed from the
wrench boss.
