Page 1 of 2
Rev. G
Date: 9/23
Document No. BF-720A
Product No. Model 720A
Patent zurn.com/patents
Model 720A
Pressure Vacuum Breaker Assembly
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
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, 877-892-5216
www.zurn.com
Application
Designed for installation on irrigation water lines to protect
against backsiphonage of contaminated water into the po-
table water supply. Assembly shall provide protection where
a potential health hazard exists. For non-potable applications
only.
Standards Compliance
• ASSE® Listed 1020
• UPC® Listed
• CSA® Certified B64.1.2
• Approved by the Foundation for Cross-Connection Control
and Hydraulic Research at the University of Southern
California
Materials
Main valve body Cast Bronze ASTM B584
Fasteners Stainless Steel, 300 Series
Elastomers Silicone
Buna Nitrile
Polymers Polypropylene
POM Acetal (Delrin®)
Springs Stainless Steel, 300 series
Features
Sizes: 1/2", 3/4", 1", 1 1/4", 1 1/2", 2"
Maximum working water pressure 150 PSI
Maximum working water temperature 110°F
Hydrostatic test pressure 300 PSI
End connections threaded ANSI B1.20.1
Accessories
Repair kit (complete)
Water Hammer Arrester (Model 1260XL)
QT-SET Quick Test Fitting Set
MODEL SIZE DIMENSIONS (approximate) WEIGHT
A B C D LESS BV WITH BV
in. mm in. mm in. mm in. mm in. mm lbs. kg lbs. kg
1/2 15 7 1/8 181 4 1/16 103 4 1/4 108 2 1/4 57 1.8 0.8 3.8 1.4
3/4 20 7 3/16 183 4 5/16 110 4 5/16 110 2 3/8 60 1.8 0.8 3.8 1.4
1 25 7 3/4 197 4 5/8 117 4 3/4 121 2 5/8 67 1.8 0.8 5.1 2.3
1 1/4 32 11 279 7 7/16 189 7 7/16 189 3 1/8 79 14 6.4 20 9
1 1/2 40 10 1/2 267 7 178 7 178 3 1/8 79 14 6.4 20 9
2 50 11 1/16 281 7 9/16 192 7 11/16 195 3 1/8 79 14 6.4 26 10.4
DB
C
A
Dimensions & Weights (do not include pkg.)
Page 2 of 2
⃟ Rated Flow (established by approval agencies)
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
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6, 877-892-5216
www.zurn.com
01020304050
0
5
10
04080120 160 200
0
5
10
60
Rated Flow (Established by approval agencies)
FLOW RATES (GPM)
PRESSURE LOSS (PSIG)
69
PRESSURE LOSS (kpa)
FLOW RATES (l/s)
MODEL 720A 1/2", 3/4", 1", 1 1/4", 1 1/2" & 2" (STANDARD & METRIC)
35
1/2" (15mm) 3/4" (20mm)
1" (25mm)
1 1/4" (32mm) 1 1/2" (40mm)
2" (50mm)
12.6
10.1
7.6
5.0
2.52
3.8
3.22.52
1.89
1.26
0.63
Typical Installation
Local codes shall govern installation requirements. Unless
otherwise specified, the assembly shall be mounted at a
minimum of 12" (305mm) above the highest piping or outlet
downstream of the device. Install with adequate drain and
sufficient side clearance for testing and maintenance. The
installation shall be made so that no part of the unit can be
submerged. A pressure vacuum breaker cannot be installed
where back-pressure could occur or where spillage of water
from vent could cause damage.
Specifications
The Pressure Vacuum Breaker shall be ASSE 1020 approved, and supplied with full port ball valves. The main body and bon-
net shall be bronze (ASTM B584), the loaded-air inlet shall use an silicone elastomer spring and seat disc. The entire assem-
bly shall be accessible for maintenance and testing without removing the device from the line. For non-potable applications
only. The Pressure Vacuum Breaker shall be a Zurn Wilkins Model 720A.
INDOOR INSTALLATION
TYPICAL OUTDOOR INSTALLATION
For warm climates with no winterization
Capacity thru Schedule 40 Pipe
Pipe size 5 ft/sec 7.5 ft/sec 10 ft/sec 15 ft/sec
1/8" 1 1 2 3
1/4" 2 2 3 5
3/8" 3 4 6 9
1/2 5 7 9 14
3/4" 8 12 17 25
1" 13 20 27 40
1 1/4" 23 35 47 70
1 1/2" 32 48 63 95
2" 52 78 105 167
12" MIN. ABOVE
HIGHEST OUTLET
DIRECTION OF FLOW
12" MIN. ABOVE
HIGHEST PIPING
DIRECTION OF FLOW
TESTCOCKS (4)
1” 720A PVB
(25MM)
OUTLET SHUT OFF
VALVE (5)
OUTLET DRAIN
VALVE (6)
MAIN SHUT-OFF
VALVE (1)
INLET DRAIN
VALVE (2)
(If allowed by
local codes)
TO IRRIGATION
SYSTEM
DRAIN
DIRECTION OF FLOW
INLET
SHUT OFF
VALVE (3)
TYPICAL OUTDOOR INSTALLATION
For cold climates which require winterization
/
