Instructions / Assembly

SIZE DIMENSIONS WEIGHT
A A1 (union) B B1 (union) C D D1 (union) E E1 (union)
in. in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kgs.
1
⁄2 6
1
⁄4 159 7 178 6
3
⁄4 172 7
1
⁄2 197 2
1
⁄2 64 3
3
⁄4 95 4
1
⁄2 114 4
1
⁄4 108 5 127 2.6 1.2
3
⁄4 6
1
⁄2 165 7
3
⁄8 187 7 178 7
7
⁄8 200 2
1
⁄2 64 4 102 4
7
⁄8 124 4
1
⁄2 114 5
3
⁄8 137 2.9 1.3
1 8
3
⁄4
222 9
5
⁄8
245 9 229 9
15
⁄16
252 4 102 5
1
⁄4
133 6
3
⁄16
157 6 152 6
15
⁄16
176 5.9 2.7
1
1
⁄4 9
1
⁄4 235 10
1
⁄4 260 10 254 11 279 4 102 6
1
⁄4 159 7
1
⁄4 184 7 178 8 203 7.0 3.2
1
1
⁄2 11
3
⁄4 299 12
7
⁄8 327 11
1
⁄2 292 12
5
⁄8 321 6
1
⁄2 165 7
1
⁄4 184 8
3
⁄8 213 7
3
⁄4 197 8
3
⁄4 225 14.8 6.7
2 12
1
⁄2 318 13
3
⁄4 349 12
1
⁄4 311 13
1
⁄2 343 6
1
⁄2 165 8 203 9
1
⁄4 235 8
1
⁄2 216 9
3
⁄4 248 16.5 7.5
Note: Weights shown do not include union end ball valves and are approximate.
Dimensions – Weights
Size:
1
⁄2" - 2"
Pressure – Temperature
Max. Working Pressure: 150psi (10.3 bar)
Hydrostatic Test Press: 300psi (20.7 bar)
Temperature Range: 32°F to 140°F (0°C to 60°C)
Materials
Main Valve Body: Bronze
Elastomers: Nitrile
Models
• Union End Ball Valves
Approvals – Standards
• Approved by the Foundation for Cross-Connection Control
and Hydraulic Research at the University of Southern
California.
B
B1
C
A
A1
D
D1
E
E1
Applications
PVB assemblies are used to protect against health hazard and
non-health hazard backsiphonage conditions in industrial plants,
cooling towers laboratories, laundries, swimming pools and lawn
sprinkler systems.
Typical Installation
Pressure Vacuum Breaker assemblies should be installed at
least 12" (300mm) above the highest piping and outlet down-
stream of the assembly to preclude backpressure. Assemblies
should be installed so they are easily accessible for mainte-
nance, periodic testing, and where discharge will not be objec-
tionable. They should be protected from freezing. If the assem-
blies are subject to freezing temperatures, the freeze protection
procedures
outlined in "Service Instruction Freeze Protection Model 765"
must be followed. Assemblies must not be installed where
backpressure could occur.
The discharge pressure shall be maintained above 3.0psi on
1
⁄2" - 1
1
⁄4" sizes and 5.0psi on 1
1
⁄2"- 2" sizes to insure seating of
the spring loaded air inlet poppet.
1020 B64.1.2
Thermal water expansion and/or water hammer down stream of
the backflow preventer can cause pressure increases. Excessive
pressure should be eliminated to avoid possible damage to the
system and assembly.
12" (300mm) above the highest downstream
outlet and the highest point in
the downstream piping
Flow