Page 61 - 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)
REDUCED PRESSURE PRINCIPLE
RP 4A
RPLF 4A

RP4A
7.5 fps 1/2" 7.5 fps 3/4"
20
PRESSURE LOSS (PSI) 16 3/4"
18

14
12
10
8 1/2"
0 5 10 15 20 25 30 35 40
RATE OF FLOW (GPM)
RP4A
7.5 fps 1" 7.5 fps 1 1/4"
20
PRESSURE LOSS (PSI) 16 1" 1 1/4"
18

14
12

10
8
0 10 20 30 40 50 60 70 80 90 100
RATE OF FLOW (GPM)

RP4A
7.5 fps 1 1/2" 7.5 fps 2"
20
PRESSURE LOSS (PSI) 16 1 1/2" 2"
18

14
12
10
8
0 20 40 60 80 100 120 140 160 180
RATE OF FLOW (GPM)
Meter Rated Flow

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