Zurn Industries, LLC | Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph. 855-663-9876, Fax 805-238-5766
In Canada | Zurn Industries Limited
3544 Nashua Drive, Mississauga, Ontario L4V 1L2 Ph. 905-405-8272, Fax 905-405-1292
www.zurn.com
Rev. B
Date: 12/13
Document No. BF-975XLU
Product No. Model 975XLU
Model 975XLU
Reduced Pressure Principle Assembly
with Union Ball Valves
Page 1 of 2
A
B
G
E
F
D
C
Options
(Suffixes can be combined)
c - with full port QT ball valves (standard)
c BMS - with battery operated monitor switch
c MS - with integral relief valve monitor switch
c S - with bronze "Y" type strainer
Accessories
c Air gap
c Repair kits (rubber only)
c Thermal expansion tank (Mdl. XT)
c Soft seated check valve (Model 40XL2)
c Shock arrester (Model 1250XL)
c QT-SET Quick Test Fitting Set
Application
Designed for installation on water lines to protect against both
backsiphonage and backpressure of contaminated water into
the potable water supply. The Model 975XLU provides protec-
tion where a potential health hazard exists.
Standards Compliance
(Includes sizes 3/4”, 1”, 1-1/2”, 2”)
• ASSE® Listed 1013
• IAPMO® Listed
• CSA® Certified
• AWWA compliant C511
• NYC MEA 425-89-M VOL 3
• Approved by the Foundation for Cross Connection
Control and Hydraulic Research at the University of
Southern California
Materials
Main valve body Cast Bronze ASTM B 584
Access covers Cast Bronze ASTM B 584
Fasteners Stainless Steel, 300 Series
Elastomers Silicone (FDA approved)
Buna Nitrile (FDA approved)
Polymers Noryl™, NSF Listed
Springs Stainless Steel, 300 series
Features
Sizes: 3/4", 1", 1-1/4", 1-1/2", 2"
Maximum working water pressure 175 PSI
Maximum working water temperature 180°F
End connections Threaded ANSI B1.20.1
Relief Valve discharge port:
3/4” - 1” - 0.63 sq. in.
1 1/4” - 2” - 1.19 sq. in.
Dimensions & Weights (do not include pkg.)
ഌ
Flow Characteristics
Zurn Industries, LLC
| Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph. 855-663-9876, Fax 805-238-5766
In Canada | Zurn Industries Limited
3544 Nashua Drive, Mississauga, Ontario L4V 1L2 Ph. 905-405-8272, Fax 905-405-1292
www.zurn.com
Page 2 of 2
Typical Installation
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 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 or where relief valve discharge
could cause damage.
Speci cations
The Reduced Pressure Principle Backflow Preventer shall be ASSE® 1013 Listed, rated to 180° F and supplied with full port
union ball valves. The main body and access covers shall be bronze (ASTM B 584), the seat ring and all internal polymers
shall be NSF® Listed Noryl™ and the seat disc elastomers shall be silicone. The first check shall be accessible for mainte-
nance without removing the relief valve. If installed indoors, the installation shall be supplied with integral monitor switch and
air gap piped to a properly sized drain. The Reduced Pressure Principle Backflow Preventer shall be a ZURN WILKINS Model
975XLU.
AIR GAP
12" MIN.
30" MAX.
DIRECTION OF FLOW
DRAIN
PROTECTIVE
ENCLOSURE
12" MIN.
30" MAX.
DIRECTION OF FLOW
0
20
40
60
80
5
10
15
20
0
50
100
150
200
250
5
10
15
20
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
69
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
MODEL 975XLU 3/4", 1", 1 1/4", 1 1/2" & 2" (STANDARD & METRIC)
35
3/4" (20mm)
1" (25mm)
1 1/4" (32mm)
2" (50mm)
103
15.8
12.6
9.5
6.3
3.2
5.0
3.82.52
1.26
11/2"
(40mm)
137
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