Specifications

27
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OptionsTypical InstallationX Ref
Model 350 Flanged body, NRS gate valves
Model 350A Grooved body, with grooved by flanged NRS
gate valves
Model 350L Flanged body, less gate valves
Model 350AL Grooved body, less gate valves
Model 350G Flanged body, with flanged by grooved NRS
gate valves
Model 350AG Grooved body, with grooved by grooved NRS
gate valves
Model 350OSY Flanged body, with flanged by flanged OS&Y
gate valves
Model 350AOSY Grooved body, with grooved by flanged OS&Y
gate valves
Model 350OSYG Flanged body, with flanged by grooved OS&Y
gate valves
Model 350AOSYG Grooved body, with grooved by grooved OS&Y
gate valves
Model 350FG Flanged body, with flanged inlet connection and
grooved outlet connection
Model 350AFG Grooved body, with flanged inlet connection and
grooved outlet connection
Model 350FSC Same as 350 except supplied with an epoxy
coated flanged wye strainer
Model 350AFSC Same as 350A except supplied with an epoxy
coated wye strainer
Model 350PI Flanged body supplied with Post Indicator Valve
Model 350API Grooved body supplied with Post Indicator Valve
Model 350ABGVIC Grooved body, with grooved by grooved,
tampered Victaulic
®
butterfly valves (2
1
/
2
” – 8”)
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.
Double Check Valve 350A/350 Series Pat. No. 5,913,331
Features Applications
• 350A 2
1
/
2
”, 3”, 4”, 6”, 8”, 10”
350 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 non-rising stem resilient wedge gate
valves and four resilient seated ball valve test cocks
• Lightweight, thin wall, epoxy-coated ductile iron
• Check components are made from lead-free engineered plastics 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 1015 (horizontal/vertical), AWWA Listed (horizontal/
vertical), IAPMO
®
Listed (350 only) (horizontal/vertical)
• CSA
®
Certified (horizontal/vertical), C-UL
®
Classified (horizontal/
vertical), UL
®
Classified (horizontal/vertical), FM
®
Approved
(horizontal/vertical) (2
1
/
2
” – 10”)
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
(horizontal/vertical) (2
1
/
2
” – 10”)
• 12” UL Classified (horizontal)
• Contact Wilkins for approval updates
Building on Wilkins’ penchant for creating problem solving designs, the 350A / 350 series double check
valve assemblies step up to the plate. From their short, light weight ductile iron bodies to their patented
low head loss Compound Checks
®
, the 350A / 350 series offers the best features a modern double check
can offer. The 350A series utilize grooved couplings to attach the shut-off valves to the body whereas
the 350 utilizes flanges. Acceptable for use in any non-health hazard application, the 350A / 350 double
check valve assemblies are the valves that the fire, plumbing, and irrigation professionals view as the
zenith in backflow prevention assembly design.
 FSC wye strainer (non fire protection applications)
 OS&Y gate valve tamper switch (OSY-40)
Local codes shall govern installation
requirements. Unless otherwise specified ,
the assembly shall be mounted at a mini-
mum 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.
 Test cock lock (Model TCL24)
(350ABGVIC shown)
OUTDOOR INSTALLATION
MODEL 350AFSC
INDOOR INSTALLATION
MODEL 350ABGVIC
INDOOR INSTALLATION
(VERT.) MODEL 350OSYG
PROTECTIVE
ENCLOSURE
DIRECTION OF FLOW
12" MIN.
30" MAX.
DIRECTION OF FLOW
DIRECTION OF FLOW
12" MIN.
30" MAX.
Accessories
WILKINS WATTS CONBRACO FEBCO AMES
350 774, 774X 4S-100 850, 857 2000SS, 200(a) Maxim & Colt
775, 757a 2001SS
Backflow Preventers