Page 68 - Apollo - 2016 Backflow Prevention Catalog

BACKFLOW PREVENTION CATALOG

Flow Curves

Flow Curves: Pressure loss versus flow data as determined by
independent approval agencies. (See Notes on page 71)

ATMOSPHERIC TYPE VACUUM BREAKERS
PVB 4A
PVBLF 4A

Note: 5 feet per second is the normal flow rate for
irrigation systems (where majority of PVBs are used)

PVB4A
5 fps 1/2" 5 fps 3/4"
12
11 9
PRESSURE LOSS (PSI) 8 7 6 5 1/2" 3/4"
10

2 4 3
1
0 5 10 15 20 25 30 35 40
RATE OF FLOW (GPM)

PVB4A
5 fps 1" 5 fps 1-1/4"
12
11 9
PRESSURE LOSS (PSI) 8 7 6 5 4 1" 1 1/4"
10

1 3 2
0 20 40 60 80 100
RATE OF FLOW (GPM)

PVB4A
5 fps 1-1/2" 5 fps 2"
12
11 9
PRESSURE LOSS (PSI) 8 7 6 5 1 1/2" 2"
10

2 4 3
1
0 20 40 60 80 100 120 140 160 180
RATE OF FLOW (GPM)

Meter Rated Flow
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