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 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 test-
ing. The valve should not be installed in an area where freezing
or spillage will cause damage. Adequate drainage/freeze pro-
tection 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 909/009 Reduced Pressure Zone Backflow
Preventer. For Protection against water hammer shock install a
Watts Series 15 Water Hammer Arrestor utilizing good plumb-
ing practice.
Dimensions – Weights
800M4QT
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" – 2" (15 - 50mm) 800M4QT only)
CSA (
1
⁄2" – 2" (15 - 50mm) 800M4QT only)
D
C
E
A
G
B
C
D
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
AB 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
45°
Union
Outlet Drain
Valve
Flow
Inlet Drain
Main Shutoff Valve
12" (300mm)
Minimum
clearance
above the
highest point
of down-
stream pip-
ing.
1020
U800M4QT