Flow-coefficient, Standard screens, Dimensions — weights – Watts 77F-CSI User Manual
Page 2: Performance data
Flow-coefficient
The flow coefficient (Cv) is the number of gallons per minute
of water flowing through a given size restriction at a pressure
drop of one psi. To obtain the Cv factor for a given size strain-
er, read capacity at intersection with the one (1) psi
pressure drop.
Conversions:
For gpm to lpm, multiply by 3.8. For psi
to bar, multiply by .069
Standard Screens
SIze
OpeNINgS
StaNdard SCreeNS
in
mm
in
mm
1
/
2
- 1
1
/
2
15-40
0.032
0.813
1
⁄
32
304SS perf.
2 - 3
50-80
0.045
1.143
3
⁄
64
304SS perf.
4 - 6 100-300
0.125
0.317
1
⁄
8
304SS perf.
a
B
Inlet
C
Npt
Dimensions — Weights
SIze
dImeNSIONS
WeIghtS
A
B
C (NPT)
in.
mm
in.
mm
in.
mm
in.
mm
lbs.
kgs.
1
⁄
2
15
6
152
3
7
⁄
8
98
1
⁄
4
8
6
2.4
3
⁄
4
20
7
178
4
1
⁄
4
108
3
⁄
8
10
7
2.9
1
25
7
1
⁄
2
191
4
3
⁄
4
121
1
⁄
2
15
9
4.0
1
1
⁄
2
40
9
229
5
5
⁄
8
143
1
⁄
2
15
12
5.4
2
50
8
5
⁄
8
219
5
1
⁄
4
133
1
⁄
2
15
20
9.0
2
1
⁄
2
65
10
1
⁄
4
260
7
1
⁄
2
191
3
⁄
4
20
32 14.5
3
80
11
5
⁄
8
295
7
178
1
25
36 16.3
4 100 14
3
⁄
8
365
9
1
⁄
8
232 1
1
⁄
2
40
61 27.6
5 125 17
5
⁄
8
448
11
279
2
50
110 49.8
6 150 18
5
⁄
8
473
13
330
2
50
160 72.5
Dimensions shown are subject to change.
Contact Watts for exact dimensions when required.
Performance Data
Table shows flows (gpm-water) at various pressure drops (psi)
using standard screens.
ES-77F-CSI 0936
© Watts, 2009
6
150
5
125
4
100
3
80
2
1
⁄
2
65
2
50
1
1
⁄
2
40
1
1
⁄
4
32
1
25
3
⁄
4
20
1
⁄
2
15
Strainer
Size
1000
100
10
1
.7
0.1
1
10
Flow
(water)
-
gpm
pressure drop - psi
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