Watts 957Z - Manual (Page 3)

3 ⁄
4
", 1" 909
3
lpm gpm
570 150
475 125
380 100
285 75
190 50
95 25
0 0
Rate of Flow
Pressure
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 psi
0 .7 1.4 2.1 2.8 3.5 4.1 4.8 5.5 6.2 6.9 7.6 8. 3 9.0 9.6 10.3 bar
1 1 ⁄
4
", 1 1 ⁄
2
", 2" 909
lpm gpm
2090 550
1900 500
1710 450
1520 400
1330 350
1140 300
950 250
760 200
570 150
380 100
190
50
0 0
Rate of Flow
Pressure
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 psi
0 .7 1.4 2.1 2.8 3.5 4.1 4.8 5.5 6.2 6.9 7.6 8. 3 9.0 9.6 10.3 11.0 11.7 12.4 bar
2 1 ⁄
2
" - 3" 909
lpm gpm
1520 400
1330 350
1140 300
950 250
760 200
570 150
380 100
190 50
0 0
Rate of Flow
Pressure
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 psi
0 .7 1.4 2.1 2.8 3.5 4.1 4.8 5.5 6.2 6.9 7.6 8. 3 9.0 9.6 10.3 11.0 11.7 12.4 bar
Note: These curves
represent catastrophic
or worst case discharge
rates. These curves
were developed by pres-
surizing the outlet of
the backflow preventer
with the second check
valve’s internals removed
from the body.
4", 6", 8", 10" 909
lpm gpm
3420 900
3040 800
2660 700
2280 600
1900 500
1520 400
1140 300
760 200
380 100
0 0
0 5 15 25 35 45 55 65 75 85 95 105 115 125 135 145 psi
0 .3 1.0 1.7 2.4 3.1 3.8 4.5 5.5 5.9 6.5 7.2 7.9 8.6 9.3 10 bar
Rate of Flow
Pressure