SPECIFICATION SUBMITTAL SHEET Model 720A

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WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 ... with full port QT ball valves (standard).

Model 720A

®

a

®

Pressure Vacuum Breaker Assembly

company

SPECIFICATION SUBMITTAL SHEET APPLICATION Designed for installation on potable water lines to protect against backsiphonage of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists. STANDARDS COMPLIANCE

   

FEATURES Sizes:

ASSE ® Listed 1020 IAPMO® Listed CSA ® Certified Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

MATERIALS Main valve body Fasteners Elastomers Polymers Springs

 1/2"  3/4"  1"  1 1/4"  1 1/2"  2"

Maximum working water pressure Maximum working water temperature Hydrostatic test pressure End connections threaded

150 PSI 110°F 300 PSI ANSI B1.20.1

OPTIONS (Suffixes can be combined)

B

D

- with full port QT ball valves (standard)



Cast Bronze ASTM B584 Stainless Steel, 300 Series Silicone (FDA approved) Buna Nitrile (FDA approved) Polypropylene (FDA approved) Delrin® (FDA approved) Stainless Steel, 300 series

ACCESSORIES

A

 Repair kit (complete)  Water Hammer Arrester (Model 1250)  QT-SET Quick Test Fitting Set

C

DIMENSIONS & WEIGHTS (do not include pkg.) DIMENSIONS (approximate)

MODEL SIZE in.

mm

1/2 3/4

A

B

C

in.

mm

in.

mm

15

7 1/8

181

4 1/16

20

7 3/16

183

4 5/16

1

25

7 3/4

197

1 1/4

32

11

1 1/2

40

2

50

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WEIGHT D

LESS BV

WITH BV

in.

mm

in.

mm

lbs.

kg

lbs.

kg

103

4 1/4

108

2 1/4

57

4

1.8

6

2.7

110

4 5/16

110

2 3/8

60

4

1.8

6

2.7

4 5/8

117

4 3/4

121

2 5/8

67

4

1.8

8

3.6

279

7 7/16

189

7 7/16

189

3 1/8

79

14

6.4

20

9

10 1/2

267

7

178

7

178

3 1/8

79

14

6.4

20

9

11 1/16

281

7 9/16

192

7 11/16

195

3 1/8

79

14

6.4

26

10.4

DOCUMENT #: BF-720A

REVISION: 6/12

WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 In Canada: ZURN INDUSTRIES LIMITED, 3544 Nashua Dr., Mississauga, Ontario L4V 1L2 Phone:905-405-8272 Fax:905-405-1292 Product Support Help Line: 877-BACKFLOW (877-222-5356) • Website: http://www.zurn.com

FLOW CHARACTERISTICS

0.63

10

1.26

1.89

2.52

FLOW RATES (l/s)

3.8

3/4" (20mm)

1/2" (15mm)

1" (25mm)

5 0

3.2

0

10

20

30

40

50

60

5.0

2.52

10

7.6

1 1/4" (32mm)

2" (50mm)

5 0

12.6 69 1 1/2" (40mm) 10.1

0

40

80

120

160

35

200

PRESSURE LOSS (kpa)

PRESSURE LOSS (PSIG)

MODEL 720A 1/2", 3/4", 1", 1 1/4", 1 1/2" & 2" (STANDARD & METRIC)

FLOW RATES (GPM) Rated Flow (Established by approval agencies)

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.

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 12" MIN. ABOVE HIGHEST PIPING

DIRECTION OF FLOW

OUTDOOR INSTALLATION

DIRECTION OF FLOW

INDOOR INSTALLATION

SPECIFICATIONS The Pressure Vacuum Breaker shall be ASSE 1020 approved, and supplied with full port ball valves. The main body and bonnet shall be bronze (ASTM B584), the loaded-air inlet shall use an silicone elastomer spring and seat disc. The entire assembly shall be accessible for maintenance and testing without removing the device from the line. The Pressure Vacuum Breaker shall be a WILKINS Model 720A.

WILKINS a Zurn company, 1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766 In Canada: ZURN INDUSTRIES LIMITED, 3544 Nashua Dr., Mississauga, Ontario L4V 1L2 Phone:905-405-8272 Fax:905-405-1292 Product Support Help Line: 877-BACKFLOW (877-222-5356) • Website: http://www.zurn.com

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