Watts 188A User Manual
For Health Hazard Applications
ES-188A
Job Name
Job Location
Engineer
Approval
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Series 188A
Anti-Siphon Vacuum Breaker
For Irrigation Systems
Sizes: 3⁄4" - 2" (20 - 50mm)**
Series 188As are designed to protect drinking water supplies from
backsiphonage of contaminated water in accordance with national
plumbing codes and water authority requirements for non-potable
service applications such as irrigation, fireline, or industrial processing. Features 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. Upon downstream demand,
the vent disc assembly rises, sealing the atmospheric vent, allowing
water to flow. A loss of supply pressure or the creation of a negative supply pressure causes the vent disc assembly to drop, opening the atmospheric vent and closing the supply side of the valve.
Contains a durable silicone disc which has high heat and water
hammer shock resistance and ensures tight seating with the lightest of seating contacts.
Contractor
Approval
Contractor’s P.O. No.
Representative
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188A
Specifications
For Anti-Siphon Vacuum Breakers
An anti-siphon vacuum breaker shall be installed where indicated
on the plans to prevent the backsiphonage of contaminated water.
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 A.S.S.E. Standard 1001,
ANSI A112.1.1 and C.S.A. B64. Watts Series 188A.
Materials
Body: Brass
Internal Trim: Bronze
Seat Disc: Silicone
Disc Float: Plastic
Approvals
1001 B64.1.1
Approved by the city of Los Angeles
Pressure – Temperature
Maximum Temperature: 180°F (82°C)
Maximum Working Pressure: 125psi (8.6 bar)
** Metric Dimensions are nominal pipe diameter. This product
is produced with NPT threaded end connections.
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.
Installation
Atmospheric Vacuum Breaker must be installed 6" (152mm)
above the highest point of the downstream piping. There can be
no shutoff valves downstream of an AVB. The AVB should not be
subjected to continuous pressure for more than 12 hours per ASSE
Std. 1001.
Dimensions — Weights
A
Capacities
3
kPa psi
82 12
62 9
41 6
Pressure Loss
21 3
0 0
0 30 60 90 120 150 170 gpm
0 114 228 342 456 570 646 lpm
/4” - 2” (20 - 50mm)**
3
/4”
1”
11/4”
Flow Rate
11/2”
2”
C
D
SIZE (DN) DIMENSIONS WEIGHT
in. mm** in. mm in. mm in. mm lbs. kgs.
3
⁄4 20 21⁄4 57 17⁄8 48 11⁄2 38 1.13 .51
1 25 2
1
⁄4 32 27⁄8 73 21⁄8 54 113⁄16 46 2.13 .96
1
1
⁄2 40 35⁄8 92 27⁄16 62 23⁄16 56 3.63 1.64
1
2 50 4
A C D
7
⁄8 73 21⁄8 54 111⁄16 43 1.75 .79
1
⁄8 105 27⁄8 73 21⁄2 64 5.25 2.38
** Metric Dimensions are nominal pipe diameter. This product
is produced with NPT threaded end connections.
A Watts Water Technologies Company
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
ES-188A 1223 © 2012 Watts
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