QR RECESSED FLUSH
DRY SPRINKLER
VK482 (K5.6)
TECHNICAL DATA
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]
Page 1 of 7
Form No. F_081512 19.06.24 Rev.19.1
1. DESCRIPTION
The Viking Quick Response Recessed Flush Dry Sprinkler VK482 is a small
high-sensitivity fusible element sprinkler designed for installation on concealed pipe
systems where the appearance of a smooth ceiling is desired. The sprinkler orifice
design, with a K-Factor of 5.6 (80.6 metric*), allows the sprinkler’s efficient use
of available water supplies for the hydraulically designed fire-protection system.
The two-piece design of the sprinkler and escutcheon allows installation and test-
ing of the sprinkler prior to ceiling installation. The escutcheon allows for up to 3/4”
(19.5 mm) of vertical adjustment and can be removed and re-installed, allowing
access above removable ceiling panels without shutting down the sprinkler system
and removing the sprinkler.
2. LISTINGS AND APPROVALS
UL Listed:
Category VNIV
Refer to the Approval Chart and Design Criteria on pages 3 and 4 for UL
Listing requirements that must be followed.
3. TECHNICAL DATA
Specifications:
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: 1” NPT (25mm)
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.
Covered by the following U.S. Patents: 8,636,075 and 10,220,231
Material Standards:
Sprinkler Body: QM Brass
Deflector Assembly: Bronze UNS-C22000 and Brass UNS-C36000
Pin Assembly: Stainless Steel UNS-S30200 and Brass UNS-C23000
Seat Assembly: Brass UNS-C31400 or UNS-C31600
Belleville Spring Sealing Assembly: Nickel Alloy, coated on both sides with
PTFE Tape
Fusible Element Assembly: Beryllium Nickel and Eutectic Solder
Element Cover: Copper UNS-C11000
Lever Bar Assembly: Copper Alloy UNS-C72500 and Brass UNS-C36000
Lever Arm: Stainless Steel UNS-S31600
Element Assembly: Copper UNS-C11000 and Nickel Alloy
Barrel: Steel Pipe UNS-G10260, Electrodeposited Epoxy Base Finish
Inlet and Barrel End: QM Brass
Escutcheon Materials:
Flush Dry Escutcheons: Cold Rolled Steel UNS-G10080
Ordering Information:
(Also refer to the current Viking price list.)
Order Recessed Flush Dry Sprinkler VK482 by first adding the appropriate suffix for the sprinkler and escutcheon finish, the ap-
propriate suffix for the temperature rating, and then the suffix for the length (“A” dimension) to sprinkler base part number. Order
in a specific length noted as the “A” dimension (see Figure 2). The “A” dimension is the distance from the face of the fitting (tee) to
the desired finished surface of the ceiling.
These sprinklers are listed and approved in lengths from 4-1/2” to 48” (114 mm to 1,219 mm).
Finish Suffix: White Polyester = M-/W
Temperature Suffix: 165 °F (74 °C) = C, 205 °F (96 °C) = E
For example, sprinkler VK482 a White Polyester finish and a 165 °F (74 °C) temperature rating, and “A” length of 10” = Part No.
18385MC/W10.
Viking Technical Data may be found on
The Viking Corporation’s Web site at
http://www.vikinggroupinc.com.
The Web site may include a more recent
edition of this Technical Data Page.
Replaces Form No. F_081512 Rev 15.1.P65
(Added patent number.)
