Specifications

47
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Reduced Pressure Principle Detector Assembly
475DA/DAV Series Pat. No. 5,913,331
• 4”, 6”, 8”, 10”
• Reduced pressure principle backflow preventer consisting of a pressure
differential relief valve located between two independently operated
spring-loaded center guided check valves
• Complete with two flange-ended OS&Y (grooved X flanged end) gate
valves (for fire protection applications) and four full port resilient seated
test cocks
• Available in up/down (475DA) or up/up (475DAV) configuration
• The by-pass assembly consists of a water meter in series with a reduced
pressure principle backflow preventer
• Lightweight, ductile iron construction with FDA approved fusion
epoxy coat inside and out
• Utilizes a patented center-stem-guided compound check™ closure
(Pat. No. 5,913,331)
• Modular check design utilizing lead-free engineered plastic (Noryl
®
)
and stainless steel
• Temperature range 33°F – 140°F
• Maximum pressure 175 psi
• ASSE
®
Listed 1047 (4” – 8”), UL
®
Classified,
C-UL
®
Classified, FM approved (4” – 8”)
• Approved by the Foundation for Cross-Connection Control and Hy-
draulic Research at the University of Southern California (sizes 4” – 8”)
Model 475DA Flanged OS&Y x Flanged OS&Y
Model 475DABGVIC Supplied with groove x groove, tampered
Victaulic
®
butterfly valves
Model 475DAFG Flanged inlet OS&Y gate connections and
grooved outlet OS&Y gate connection
Model 475DAG Groove by groove OS&Y gate valves
Model 475DAL Less OS&Y shutoffs (grooved body
connections)
Model 475DALM Less water meter
Model 475DAPI Supplied with post indicator gate valves
Model 475DAV Same as 475DA but in vertical configuration
Model 475DAVBGVIC Same as 475DABGVIC but in vertical
configuration (4” – 8”)
Model 475DAVFG Same as 475DAV except with flange by groove
inlet OS&Y gate valve and groove by groove
outlet OS&Y gate valve (vertical configuration)
Model 475DAVG Same as 475DAV except with groove by
groove OS&Y gate valves
Model 475DAVPI Supplied with post indicator gate valves
CFM With cubic feet meter
SCFM With Sensus cubic feet meter
To create a part number to fit your needs, see page 3.
For Additional Information, reference WK-BPC catalog or visit
our web site.
OptionsTypical Installation Features
Many fire suppression systems require their components to be installed in less than perfect locations.
Cramped closets and overflowing mechanical rooms do not leave much room for a traditional, horizontal
reduced pressure detector assembly. The 475DA and 475DAV were designed to solve this problem. The
475DA, with its “N” pattern design, and the 475DAV for vertical up-up flows provide compact backpressure
and backsiphonage protection in high hazard fire protection applications. The 475DA / 475DAV series
utilize the highly repeatable and low head loss generating Compound Check
®
, and are up to the challenge
that any high hazard fire suppression system may present.
 Air gap (Model AG)
 Thermal expansion tank (Model XT)
 Valve setter (Model FLS or MJS or MJFS)
Local codes shall govern installation requirements. To be installed in accordance with the manufacturers’ 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.
 OS&Y gate valve supervisory switch (OSY-40)
 Quick test set (QT-SET)
 Test cock lock (Model TCL24)
Accessories Applications
475DAVG
475DAG
12" MIN.
30" MAX.
WILKINS VALVE
SETTER
MJFS
DIRECTION OF FLOW
PROTECTIVE
ENCLOSURE
AIR GAP
SUPPORT
DIRECTION OF FLOW
DRAIN
AIR
GAP
MODEL 475DAV MODEL 475DA
12" MIN.
30" MAX.
WILKINS VALVE
SETTER
MJFS
DIRECTION OF FLOW
PROTECTIVE
ENCLOSURE
AIR GAP
SUPPORT
DIRECTION OF FLOW
DRAIN
AIR
GAP
MODEL 475DAV MODEL 475DA
Backflow Preventers