Watts 288A User Manual
Series 288A
Hot or Cold Water Anti-Siphon
Vacuum Breakers
Sizes: 1⁄4" - 3" (8-80mm)
Series 288A represents a complete line of vacuum breakers
designed to prevent backsiphonage of contaminated water into
a potable water supply.
They feature a lightweight, durable “disc float” suitable for temperatures up to 180°F (82°C) which closes the atmospheric
vent to prevent spilling under all rates of flow. Therefore, they
are ideally recommended for low flow installations such as laboratory equipment which use such a small amount of water.
They also contain a durable silicone disc which has high heat
and water hammer shock resistance and assures tight seating
with the lightest of seating contact.
Full Size Orifice - Series 288A has a full-size orifice to assure
pipe size capacity. Water passages are streamlined to provide
high water flow with minimal pressure loss.
For bottom/inlet and outlet connection type vacuum breakers
1
⁄4", 3⁄8" (8, 10mm) size, send for ES-N388.
Features
• Brass Body
• Full size orifice for maximum flow
• Lightweight disc assembly prevents spilling under all rates
of flow
Models
288A1/4" – 3" (8 – 80mm) with brass body
288A-C
1
/4" – 1" (8 – 25mm) with brass body and polished
chrome finish
Specifications
For Anti-Siphon Vacuum Breakers
An atmospheric type anti-siphon vacuum breaker shall be
installed where indicated on the plans to prevent the backsiphonage of contaminated water. Device shall include lightweight disc float with silicone disc for tight seating. This device
is not to be used under continuous pressure or where there is
a possibility that a backpressure condition may develop. The
device shall meet the requirements of ASSE Standard 1001,
ANSI A112.1.1 and CSA B64. Watts Regulator Company
Series 288A.
For Health Hazard Applications
ES-288A
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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1
/2" 288A
Center Stem Guide
for accurate seating
Disc has high heat
and water hammer
shock resistance
Disc Float
durable and light-
weight, closes vent
with minimum flow
Full Size Orifice
assures pipe
size capacity
Since atmospheric type vacuum breakers are subject to normal maintenance and replacement, they should be located where emergency water
spillage will create no problem and where they can be accessible for
inspection or servicing.
IMPORTANT NOTE:
This device shall not be subjected to continuous pressure for more than
twelve (12) hours per ASSE Std. 1001. For continuous pressure application, specify Watts Series 800 pressure type vacuum breakers.
Vacuum breakers are not designed, tested or approved to protect
against backpressure backflow. For protection against backpressure
backflow, install Watts Series 909 or Series 009 reduced pressure principle backflow preventers.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
A
C
D
Pressure Loss
1001 B64.1.1
Capacities
kPa psi
83 12
69 10
55 8
41 6
28 4
14 2
00
SIZE (DN) DIMENSIONS WEIGHT
ABCD
in. mm in. mm in. mm in. mm in. mm oz. gm.
1
⁄4 81
3
⁄4 44 21⁄4 57 11⁄4 32 1 25 6 170
3
⁄8 10 13⁄4 44 21⁄4 57 11⁄4 32 1 25 6 170
1
⁄2 15 2 50 23⁄4 70 11⁄2 38 11⁄4 32 8 227
3
⁄4 20 21⁄4 57 3 76 11⁄2 38 11⁄2 38 18 510
125 2
7
⁄8 73 35⁄8 92 17⁄8 48 13⁄4 44 28 794
11⁄4 32 27⁄8 73 33⁄4 95 17⁄8 48 17⁄8 48 34 964
11⁄2 40 35⁄8 92 41⁄2 114 21⁄4 57 21⁄4 57 54 1531
2 50 4 100 51⁄8 130 25⁄8 67 21⁄2 64 84 2381
21⁄2 65 61⁄2 165 71⁄2 191 41⁄2 114 3 76 256 7258
380 6
1
⁄2 165 8 200 45⁄8 117 33⁄8 86 274 7768
Materials
Body: Brass
Disc: Silicone
Pressure — Temperature
Maximum Temperature: 180°F (82°C)
Maximum Working Pressure: 125psi (8.6 bar)
Installations
Atmospheric VB must be installed 6" (152mm) above the highest point on the downstream piping. There can be no shutoff
valves downstream of an AVB.
Approvals
Certified thru 1" (25mm) CSA
Dimensions — Weights
0 5 10 15 20 25 30 35 gpm
0 19 38 7 76 95 114 113 lpm
Flow Rate
Pressure Loss
kPa psi
83 12
69 10
55 8
41 6
28 4
14 2
00
01020304050607080gpm
0 38 76 114 152 190 228 266 304 lpm
Flow Rate
Pressure Loss
kPa psi
83 12
69 10
55 8
41 6
28 4
14 2
00
0 50 100 150 200 250 300 350 400 450 500 gpm
0 190 380 570 760 950 1140 1130 1520 1710 1900 lpm
Flow Rate
1", 11/4", 11/2" (25, 32, 40mm)
1
/4" to 3/4" (8 to 20mm)
2", 2
1
/2", 3" (50, 65, 80mm)
1
/4"
3
/8"
1
/2"
1"
11/2"
11/4"
2"
3"
21/2"
3
/4"
ES-288A 0514 © 2009 Watts
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A Watts Water Technologies Company
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