Zurn Wilkins Model 720A Pressure Vacuum Breaker Assembly

Application

Designed for installation on irrigation water lines to protect against backsiphonage of contaminated water into the potable water supply. The assembly provides 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
Polymers: Buna Nitrile, 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

Dimensions & Weights

(Do not include packaging)

MODEL SIZE	A		B		C		D		LESS BV		WITH BV
MODEL SIZE	in.	mm	in.	mm	in.	mm	in.	mm	lbs.	kg	lbs.	kg
1/2	7 1/8	15	4 1/16	103	4 1/4	108	2 1/4	57	1.8	0.8	3.8	1.4
3/4	7 3/16	20	4 5/16	110	4 5/16	110	2 3/8	60	1.8	0.8	3.8	1.4
1	7 3/4	25	4 5/8	117	4 3/4	121	2 5/8	67	1.8	0.8	5.1	2.3
1 1/4	11	32	7 7/16	189	7 7/16	189	3 1/8	79	14	6.4	20	9
1 1/2	10 1/2	40	7	178	7	178	3 1/8	79	14	6.4	20	9
2	11 1/16	50	7 9/16	192	7 11/16	195	3 1/8	79	14	6.4	26	10.4

Flow Characteristics

The document includes graphs illustrating flow rates versus pressure loss for various sizes of the Model 720A assembly. These graphs show the performance characteristics of the unit under different flow conditions.

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

Typical Installation

Local codes govern installation requirements. Unless specified, the assembly should be mounted at a minimum of 12 inches (305mm) above the highest piping or outlet. Ensure adequate drain and sufficient side clearance for testing and maintenance. The installation must prevent submergence of any part of the unit. A pressure vacuum breaker cannot be installed where back-pressure could occur or where spillage from the vent could cause damage.

Indoor Installation

Diagram shows indoor installation with main shut-off valve, inlet drain valve, test cocks, and outlet shut-off valve.

Typical Outdoor Installation (Warm Climates)

Diagram shows outdoor installation for warm climates with no winterization.

Typical Outdoor Installation (Cold Climates)

Diagram shows outdoor installation for cold climates requiring winterization.

Specifications

The Pressure Vacuum Breaker is ASSE 1020 approved and supplied with full port ball valves. The main body and bonnet are bronze (ASTM B584). The loaded-air inlet utilizes a silicone elastomer spring and seat disc. The entire assembly is accessible for maintenance and testing without removing the device from the line. For non-potable applications only. The Pressure Vacuum Breaker is a Zurn Wilkins Model 720A.

Manufacturer Information

Zurn Industries, LLC | Wilkins
1747 Commerce Way, Paso Robles, CA U.S.A. 93446
Phone: 855-663-9876 | Fax: 805-238-5766
In Canada: Zurn Industries Limited
7900 Goreway Drive, Unit 10, Brampton, Ontario L6T 5W6
Phone: 877-892-5216
Website: www.zurn.com

Document No. BF-720A

Product No. Model 720A

Patent information available at zurn.com/patents

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