Specifications

23
Tech Support: 855-ONE-ZURN
www.zurn.com
OptionsTypical InstallationX Ref
Model 350 With full port QT ball valves (standard)
Model 350FT Supplied with fast-test test cocks
Model 350L Less ball valves – male pipe thread
Model 350S With bronze wye strainer
Model 350SH Supplied with stainless steel handles
Model 350BOF Blow out flush housing for easy winterizing and
startup bundled with the Model 350 (3/4" & 1")
Model 350SHFT Stainless steel handles, Fast-test test cocks
Model 350XL California AB 1953 compliant
For Additional Information, reference WK-BPC catalog or visit
our web site.
Double Check Valve Assembly Model 350
Features
• 3/4”, 1”, 1
1
/
4
”, 1
1
/
2
”, 2”
• Short lay length – fits in smaller valve box
• Top access to test cocks and shutoff valves and check assembly – easy to
test
• Entire pressure vessel is removable to facilitate check access for cleaning
or repair
• Test cocks are provided with threaded caps
• Easy to winterize by removing pressure vessel between shutoff valves
• Plastic pressure vessel is a theft deterrent
• Removable pressure vessel eliminates the need of union connections
• Blow out flush fitting allows system flush and irrigation system blow-
outs
• Simple design – composite housing and check modules resist corrosion
• ASSE
®
Listed 1015 (horizontal/vertical), IAPMO
®
Listed, CSA
®
Certified
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
(horizontal and vertical, 3/4" & 1")
• Contact Wilkins for approval updates on 1
1
/
4
” – 2” sizes
OUTDOOR INSTALLATIONINDOOR INSTALLATION
DIRECTION OF FLOW
2
350 DC
175 PSIG 180° F
ZURN
WILKINS/
PROTECTIVE
ENCLOSURE
MODEL 350
MODEL 350S
DIRECTION OF FLOW
12" MIN.
30" MAX.
The Wilkins model 350 double check valve assembly, with its revolutionary removable pressure vessel, is de-
signed to protect against backpressure and backsiphonage of polluted water into the potable water sup-
ply. In addition to the removable pressure vessel, the 350 series offers low head loss, short lay length, and
top mounted test cocks resulting in superior valve box installation flexibility. The removable pressure vessel
allows for the most rapid repair of any valve in the Backflow Preventer marketplace. The blow-out, flush
fitting greatly simplifies start-up flushing and winterization blow-outs (where needed). The 350 is designed
for applications where a health hazard does not exist, and is suitable for use in residential, commercial,
industrial, and irrigation applications where a double check valve assembly is called for.
 Wye strainer (Model S)
 Thermal expansion tank (Model XT)
 Quick test set (QT-SET)
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.
 Test cock lock (Model TCL24)
 Winterizing blow out / flush fitting (RK34-350BOF or RK1-350BOF)
 Ball valve monitor switch (Model BVMS, 3/4" & 1")
Model 350
RK34-350BOF
Accessories Applications
WILKINS WATTS CONBRACO FEBCO AMES HERSEY
350 007QT, 775, 719 40-100-T2 805Y, 850 200B, 2000B HDC, FDC
Backflow Preventers