Page 55 - 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)
DOUBLE CHECK VALVES
DC 4A
DCLF 4A
DC4A
7.5 fps 1/2" 7.5 fps 3/4"
20
18
PRESSURE LOSS (PSI) 14 8 3/4"
16

12
10

4 6 1/2"
2
0 10 20 30 40
RATE OF FLOW (GPM)
DC4A
7.5 fps 1" 7.5 fps 1 1/4"
20
18
PRESSURE LOSS (PSI) 14 1" 1 1/4"
16

12
10
8
6
4
2
0 10 20 30 40 50 60 70 80 90 100 110
RATE OF FLOW (GPM)
DC4A
7.5 fps 1 1/2" 7.5 fps 2"
20
18
PRESSURE LOSS (PSI) 14 8 1 1/2" 2"
16

12
10

4 6
2
0 20 40 60 80 100 120 140 160 180 200 220 240
RATE OF FLOW (GPM)

Meter Rated Flow

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