Specifications

46
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OUTDOOR INSTALLATION (MODEL 375ADA with BGVIC option)
PROTECTIVE
ENCLOSURE
DIRECTION OF FLOW
12" MIN.
30" MAX.
AIR GAP
W/DRAIN
DIRECTION OF FLOW
12" MIN.
30" MAX.
INDOOR INSTALLATION (MODEL 375ADA with G option)
OUTDOOR INSTALLATION (MODEL 375ADA with BGVIC option)
PROTECTIVE
ENCLOSURE
DIRECTION OF FLOW
12" MIN.
30" MAX.
AIR GAP
W/DRAIN
DIRECTION OF FLOW
12" MIN.
30" MAX.
INDOOR INSTALLATION (MODEL 375ADA with G option)
OptionsTypical InstallationX Ref
Model 375ADA Flanged OS&Y x flanged OS&Y
Model 375ADAL Grooved body, less gate valves
Model 375ADAG Grooved body, with grooved X grooved
OS&Y gate valves
Model 375ADAFG Grooved body, with flanged inlet OS&Y gate
valve and grooved outlet OS&Y gate valve
Model 375ADAPI Grooved body supplied with Post Indicator
Valve
Model 375ADABGVIC Grooved body, with grooved by grooved
tampered Victaulic
®
butterfly valves
(2
1
/
2
” – 8”)
Model 375DA Flanged OS&Y x flanged OS&Y gate valve
Model 375DAFG Flanged body, with flanged inlet OS&Y gate
valve and grooved outlet OS&Y gate valve
Model 375DAL Flanged body, less gate valves
Model 375DAG Flanged body, with flanged X grooved OS&Y
gate valves
Model 375DAPI Flanged body supplied with post indicator
valve
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.
Reduced Pressure Principle Detector Assembly
375ADA/375DA Series Pat. No. 5,913,331
Features Applications
• 375ADA 4”, 6”, 8”, 10”
375DA 2
1
/
2
”, 3”, 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, inlet and outlet flange-ended
OS&Y resilient wedge gate valves and four full port resilient seated test
cocks
• The by-pass assembly consists of a water meter in series with a reduced
pressure principle backflow preventer
• For use in fire line services
• Modular check design utilizing lead-free engineered plastic (Noryl
®
) and
stainless steel
• Temperature range 33°F – 140°F
• Maximum pressure 175 psi
• Available with CFM water meter.
• ASSE
®
Listed 1047 375DA (4” – 8”), UL
®
Classified, FM
®
Approved,
C-UL
®
Classified
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
(375ADABGVIC 4” – 8”)
When the fire protection professional demands a reduced pressure detection assembly with
low head loss and end connection flexibility, the Wilkins 375ADA / 375DA series RPDA's are the
preferred choice. Offered with either OS&Y or tamper switch equipped butterfly shut-off valves,
Wilkins make installation easier with the choice of grooved or flanged end connections. De-
signed to protect against high hazard backpressure or backsiphonage conditions in unmetered
fire lines, the 375ADA / 375DA Series provides low head loss with Wilkins patented Compound
Check
®
. In addition to low head loss, the ductile iron body provides low weight & uncompro-
mising strength for those challenging fire protection installations.
 Air gap (Model AG)
 Thermal expansion tank (Model XT)
 OS&Y gate valve supervisory switch (OSY-40)
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.
 Quick test set (QT-SET)
 Test cock lock (Model TCL24)
Accessories
(375ADABGVIC shown)
WILKINS WATTS AMES
375DA 994RPDA, 975RPDA 5000SS, 500 Maxim & Colt
OUTDOOR INSTALLATION
MODEL 375ADABGVIC
INDOOR INSTALLATION
MODEL 375ADAG
Backflow Preventers