Submittal Sheet

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 LeadFree*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ade-
quate space for periodic inspection, servicing or testing. The
valveshouldnotbeinstalledinanareawherefreezingorspill-
agewillcausedamage.Adequatedrainage/freezeprotection
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.
Important Note: Vacuum breakers are not designed, tested
or approved to protect against backpressure backflow or water
hammer shock. For protection against backpressure backflow,
installWattsLF009ReducedPressureZoneBackflowPreventer.
For protection against water hammer shock install a Watts Series
LF15WaterHammerArrestorutilizinggoodplumbingpractice.
Dimensions – Weights
LF800M4QT
Standards
ANSI,USCManualSection10
Approvals
ApprovedbythefoundationforCross-ConnectionControland
HydraulicResearchattheUniversityofSouthernCalifornia,
Manual Section 10. (
1
⁄2" – 1" (15 - 25mm) LF800M4QT only)
CSA(
1
⁄2" – 1" (15 - 25mm) LF800M4QT only)
D
C
E
A
G
B
Freeze Protection Guidelines
1. Closemainshutoffvalve.
2. Open upstream drain, test cocks and isolation ball
valvestodepressurizeline.
3. Purgewithair.
4. Leave test cocks and isolation ball valve handles in 45°
angle to drain ball valves and prevent casting damage.
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.
LF800M4QT
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
LF800M4QT
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
LF800M4QT 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
45°
Union
Outlet Drain
Valve
Flow
Inlet Drain
Main Shutoff Valve
12" (300mm)
Minimum
clearance
above the
highest point
of down-
stream
piping.
1020
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