Technical Specifications

ManualsBrandsWatts ManualsBackflow Prevention3/8" Bronze Vacuum Breaker

Pressure Loss

Capacities

kPa psi

96 14

83 12

69 10

55 8

41 6

28 4

14 2

Materials

Body: Bronze

Disc: Silicone

Pressure — Temperature

Maximum Temperature: 180°F (82°C)

Maximum Working Pressure: 125psi (8.6 bar)

Approvals

Dimensions — Weights

0 5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 gpm

0 1.9 3.8 5.7 76. 9.5 11.4 13.3 15.2 lpm

Flow Rate

/8" (10mm)

/4" (8mm)

SIZE (DN) DIMENSIONS WEIGHT

AB C

in. mm in. mm in. mm in. mm lbs. kg.

⁄4 81

⁄4 44 2

⁄16 59

⁄4 19 .50 .2

⁄8 10 1

⁄4 44 2

⁄8 60

⁄8 22 .75 .3

This device is not to be used under continuous pressure. For contin-

uous pressure application, specify Watts No. 800 Series pressure

type vacuum breakers. Vacuum breakers are not designed, tested or

approved to protect against backpressure backflow. For protection

against backpressure backflow, install Watts No. 909 Series reduced

pressure principle backflow preventers.

Since atmospheric-type vacuum breakers are subject to normal

maintenance and replacement, they should be located where emer-

gency water spillage will create no problems and where they can be

accessible for inspection or servicing.

Pressure Loss

Dry Guide out of the

liquid pressure area

Disc has high heat

and water hammer

shock resistance

Disc Float durable

and lightweight,

closes vent with

minimum flow

Full Size

Orifice assures

pipe capacity

IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES

FOR LOCAL INSTALLATION REQUIREMENTS

0 5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 gpm

0 1.9 3.8 5.7 7.6 9.5 11.4 13.3 15.2 17.1 19.0 20.9 22.8 lpm