Specifications

30
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Double Check Detector 350ADA/350DA Series Pat. No. 5,913,331
• 350ADA 2
1
/
2
", 3", 4", 6", 8", 10"
350DA 2
1
/
2
", 3", 4", 6", 8", 10”, 12"
• Double check valve consisting of two independently operated spring-
loaded center guided check valves
• Complete with two flange-ended resilient wedge OS&Y gate valves and
four resilient seated ball valve test cocks
• The by-pass assembly consists of a water meter in series with a double
check backflow preventer
• For use in fire line applications
• Lightweight, thin wall, epoxy-coated ductile iron
• Modular check design utilizing lead-free engineered plastic (Noryl
®
) and
stainless steel
• No threads or taps in body or cover, eliminating exposure to corrosion
• Single access cover reduces maintenance down time
• Entire unit serviceable in line
• Temperature range 33°F – 140°F
• Maximum pressure 175 psi
• ASSE
®
Listed 1048 (horizontal/vertical),
UL
®
Classified (horizontal/vertical), C-UL
®
Classified (horizontal/vertical),
FM
®
Approved (horizontal/vertical), CSA
®
Classified (horizontal/vertical),
AWWA Compliant (horizontal/vertical) (2" – 10")
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California (2
1
/
2
" – 10")
• Available with CFM water meter (5/8" x 3/4")
• 12" UL classified (horizontal)
Model 350DA Flanged body, flanged OS&Y gate valves
Model 350ADA Grooved body, with grooved by flanged
OS&Y gate valves
Model 350DAL Flanged body, less gate valves
Model 350ADAL Grooved body, less gate valves
Model 350DALM Less water meter
Model 350DAG Flanged body, with flanged by grooved
OS&Y gate valves
Model 350ADAG Grooved body, with grooved by grooved
OS&Y gate valves
Model 350DAFG Flanged body, with flanged inlet connection
and grooved outlet connection
Model 350ADAFG Grooved body, with flanged inlet connection
and grooved outlet connection
Model 350DAPI Flanged body supplied with Post Indicator
Valve (3” – 12”)
Model 350ADAPI Grooved body supplied with Post Indicator
Valve (3” – 10”)
Model 350ADABGVIC Grooved body, with grooved by grooved,
tampered Victaulic
®
butterfly valves
(2
1
/
2
” – 8”)
CFM With cubic feet meter
SCFM With Sensus cubic feet meter
To create a part number to fit your needs, see page 3 for an
example
For Additional Information, reference WK-BPC catalog or visit
our web site.
PROTECTIVE
ENCLOSURE
MODEL 350ADA
12" MIN.
30" MAX.
DIRECTION OF FLOW
OptionsTypical InstallationX Ref Features Applications
Fire protection systems, with their unmetered lines and unique need for ultra-low head loss, demand
a valve that can deal with this criteria. The Wilkins 350ADA / 350DA series double check detector
assemblies are ready to take on the challenge. Designed to detect water leakage or usage while
protecting against backpressure and backsiphonage, the 350ADA / 350DA series and their patented
Compound Checks
®
provide the low head loss that fire protection professionals demand. Providing
backflow protection where a health hazard does not exist, the 350ADA / 350DA is provided with
grooved or flanged body connections and the choice of grooved or flanged terminating ends.
 OS&Y gate valve supervisory switch (OSY-40)
 Test cock lock (Model TCL24)
Local codes shall govern installation
requirements. Unless otherwise spec-
ified, 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 mainte-
nance. The installation shall be made
so that no part of the unit can be
submerged.
Accessories
WILKINS WATTS CONBRACO FEBCO AMES HERSEY
350DA 770DCDA 40-600 806YD, 858 3000SS DDC II
350DA, 350DAG 709DCDA 4S,4SG 856 3000DCDA
350DA 774DCDA 4S-60EC3 3001SS, 300(a) Maxim & Colt
Backflow Preventers