Specifications

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www.zurn.com
OptionsTypical Installation
950XLTDABF With butterfly shut-off valves
950XLTDABFSS With butterfly shut-off valves and supervisory
switches
950XLTDA With OS&Y gate valves
950XLTDALM Less water meter
950XLTDACFM With cu ft meter
950XLTDASCFM Sensus cubic ft meter
For Additional Information, reference WK-BPC catalog or visit
our web site.
Double Check Detector 950XLTDABF
Features Applications
• 2”
• Double check valve consisting of two independently operated spring-
loaded center guided check valves
• The by-pass assembly consists of a water meter (gallons standard) in se-
ries with a double check backflow preventer
• For use in fire line applications
• Entire unit serviceable in line
• Temperature range 33°F – 180°F
• Maximum working water pressure 175 psi
• Bronze body construction
• Maximum working water temperature 180°F
• Hydrostatic test pressure 350 psi
• End connections (threaded) ANSI B1.20.1
• Test cocks are provided with threaded plugs
• ASSE
®
Listed 1048 (horizontal/vertical), UL
®
Classified (horizontal/verti-
cal), C-UL
®
Classified (horizontal/vertical)
• Contact Wilkins for additional approval status
Designed to protect against backflow in residential and smaller commercial fire systems, the
Wilkins 950XLTDABF double check detector assembly offers an alternative to the larger flanged
detector assemblies that are typically used. Constructed around the 2” 950XLT, the
950XLTDABF utilizes a meter and ¾” 350 by-pass to detect the unauthorized use or leaking
of water in a residential fire protection system. Available with either OS&Y (XLTDA) or butterfly
(XLTDABF) shut-off valves, the 950XLTDABF will satisfy the design criteria of any residential fire
system that requires a short, light-weight double check detector assembly where a health haz-
ard does not exist.
 OS&Y gate valve supervisory switch (OSY-40)
 Test cock lock (Model TCL24)
 Quick test set (QT-SET)
Local codes shall govern installation requirements. To be installed in accordance with the
manufacturer’s instructions and the latest edition of the Uniform Plumbing Code. Unless
otherwise specified, the assembly shall be mounted at a minimum of 12” (305mm) and
a maximum of 30” (762mm) above adequate drains with sufficient side clearance for
testing and maintenance. The installation shall be made so that no part of the unit can
be submerged.
MODEL 950XLTDABF
MODEL 950XLTDABF
DIRECTION OF FLOW
WILKINS
175 PSI
180˚ F
2”
ASSE 1048
950 XLTDA
DCDA
53 SNIKLIW 0
CD ”4/3
OUTDOOR INSTALLATION VERTICAL INSTALLATION
DIRECTION OF FLOW
12” MIN.
30” MAX.
PROTECTIVE
ENCLOSURE
950XLTDA
DCDA
WILKINS
180˚ F
175 PSI
2”
Accessories
Backflow Preventers