MICROFAST
®
QUICK
RESPONSE FUSIBLE
ELEMENT UPRIGHT
SPRINKLER VK328 (K4.2)
TECHNICAL DATA
Page 3 of 3
Form No. F_071114 21.03.05 Rev 21.1
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.
Approval Chart 1 (UL)
Microfast
®
Quick Response Fusible Element
Upright Sprinkler VK328
Maximum 175 PSI (12 bar) WWP
Base Part
Number
1
SIN
Thread Size
Nominal K-Factor
Overall Length
Listings and Approvals
3
NPT
BSPT
U.S.
metric
2
Inches
mm
cULus
VdS
LPCB
21270
6
VK328
1/2”
15 mm
4.2
57
2-3/16
56
A1, A2
--
--
--
Approved Temperature Ratings
A - 165 °F (74 °C), 205 °F (96 °C), 280 °F (138 °C)
Approved Finishes
1 - Brass, Chrome, White Polyester
5
and Black Polyester
5
2 - ENT
7
Footnotes
1
Base part number is shown. For complete part number, refer to Viking’s current price schedule.
2
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.
3
This table shows the listings and approvals available at the time of printing. Check with the manufacturer for any additional approvals.
4
Listed by Underwriters Laboratories Inc. for us in the U.S. and Canada
5
Other colors are available on request with the same Listings and Approvals as the standard colors.
6
Listings and Approvals limited to Light Hazard Occupancies where allowed by the installation standards being applied, with hydraulically calculated wet systems only.
7
cULus Listed as corrosion resistant.
DESIGN CRITERIA - UL
(Also refer to Approval Chart 1 above.)
cULus Listing Requirements:
Quick Response Fusible Element Upright Sprinkler VK328 is cULus Listed as indicated in the Approval Chart for installation in accordance with the
latest edition of NFPA 13 for standard spray sprinklers.
•
Small orifice sprinklers are limited to Light Hazard where allowed by the installation standards being applied, with hydraulically calculated wet sys-
tems only. Exception: 4.2K sprinklers may be installed on hydraulically calculated dry pipe systems where piping is corrosion resistant or internally
galvanized.
•
The sprinkler installation rules contained in NFPA 13 for standard spray upright sprinklers must be followed.
IMPORTANT: Always refer to Bulletin Form No. F_091699 - Care and Handling of Sprinklers. Also refer to Form No. F_080614
for general care, installation, and maintenance information. 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.
Replaces Form No. F_071114 Rev 20.1
(Removed bushed part numbers)
