Specification

Materials
Springs Stainless Steel
Bonnet Celcon
VentDisc SiliconeRubber
DiscHolderFloat Polypropylene
CheckValveDisc SiliconeRubber
CheckValveSeat NorylPlastic
Body Bronze
Pressure - Temperature
TemperatureRange:33°Fto140°(0.5°Cto60°C)
MaximumWorkingPressure:150psi(10.3bar)
Installations
This valve is designed for installation in a continuous pressure
potablewatersupplysystem12"abovethehighestpointof
the downstream piping. The valve must be installed with the
supplyconnectedtothebottomandinaverticalposition.Allow
adequate space for periodic inspection, servicing or testing.
Thevalveshouldnotbeinstalledinanareawherefreezingor
spillagewillcausedamage.Adequatedrainage/freezeprotec-
tionmustbeprovidedincoldweatherapplications.1.5psi(10
kPa)mustbeexertedagainstthefloatspringtosealthefloat
andairinlet.Donotundersizesupplyanddischargepiping.
Vacuum breakers are not designed, tested or
approved to protect against backpressure backflow or water ham-
mer shock. For protection against backpressure backflow, install
Watts909/009ReducedPressureZoneBackflowPreventer.For
ProtectionagainstwaterhammershockinstallaWattsSeries15
WaterHammerArrestorutilizinggoodplumbingpractice.
Dimensions – Weights
800M4QT
Standards
ANSI,USC
Approvals
ApprovedbythefoundationforCross-ConnectionControland
HydraulicResearchattheUniversityofSouthernCalifornia.(
1
⁄2"
–2"(15-50mm)800M4QTonly)
CSA(
1
⁄2"–2"(15-50mm)800M4QTonly).
**QCmodelshavequick-connectadapterswhichattachsepa-
rately to the approved 800M4QT
D
C
E
A
G
B
C
D
A
G
B
MODEL SIZE (DN) DIMENSIONS WEIGHT
A B C D E G
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kg.
800M4QT
1
⁄2 15 6
1
⁄8 156 6
1
⁄4 159 2
9
⁄16 65 3
11
⁄16 94 3
7
⁄8 98 2
1
⁄4 57 4 1.8
800M4QT
3
⁄4 20 6
1
⁄2 165 6
1
⁄2 165 2
9
⁄16 65 3
15
⁄16 100 4
1
⁄8 105 2
1
⁄4 57 4 1.8
800M4QT 1 25 7
1
⁄2 191 7
1
⁄2 191 2
3
⁄4 70 4
3
⁄4 121 4
7
⁄8 124 3
7
⁄16 87 6 2.7
800M4QT 1
1
⁄4 32 8
7
⁄8 225 9 229 3
1
⁄4 83 5
3
⁄4 146 6
1
⁄8 156 5 127 11 5.0
800M4QT 1
1
⁄2 40 9
1
⁄4 235 9
1
⁄2 241 3
1
⁄4 83 6
1
⁄4 159 6
3
⁄8 162 5 127 14 6.3
800M4QT 2 50 10
5
⁄8 270 9
5
⁄8 245 3
1
⁄4 83 6
3
⁄8 162 7 178 5 127 19 8.6
U800M4QT
3
⁄4 20 6
3
⁄8 163 7
9
⁄16 192 2
1
⁄8 55 5
7
⁄16 138 – – 2
1
⁄4 57 4 1.8
U800M4QT 1 25 8
5
⁄16 211 9 229 2
13
⁄16 71 6
3
⁄16 158 – – 3
7
⁄16 87 6 2.7
800M4QT-QC
1
⁄2 15 7
7
⁄8 200 8 203 2
13
⁄16 71 5
7
⁄16 138 5
5
⁄8 144 3
7
⁄16 87 4.5 2.0
800M4QT-QC
3
⁄4 20 8
1
⁄2 216 8
1
⁄2 216 2
13
⁄16 71 5
11
⁄16 144 6
1
⁄8 156 3
7
⁄16 87 4.7 2.1
800M4QT-QC 1 25 9
1
⁄2 241 9
1
⁄2 241 2
13
⁄16 71 6
3
⁄4 171 6
7
⁄8 175 3
7
⁄16 87 6.6 3.0
1020
U800M4QT
NOTICE
**
**
**