Dimensions — weights, Flow-coefficient, Performance data – Watts 77SI User Manual
Page 2
in. mm
3
80
2
1
⁄
2
65
2
50
1
1
⁄
2
40
1
1
⁄
4
32
1
25
3
⁄
4
20
1⁄2
15
3⁄8
10
1⁄4
8
Strainer
Size
500
100
10
1
0.1
Flow
(water)
-
gpm
Pressure Drop - psi
ES-77SI 0936
© Watts, 2009
Dimensions — Weights
SIze (DN)
DImeNSIoNS
WeIghtS
A
B
C (NPT)
in.
mm
in.
mm
in.
mm
in.
mm
lbs.
kgs.
1
⁄
4
8
3
3
⁄
16
81
2
1
⁄
16
52
1
⁄
4
8
1.5
0.7
3
⁄
8
10
3
3
⁄
16
81
2
1
⁄
16
52
1
⁄
4
8
1.5
0.7
1
⁄
2
15
3
3
⁄
16
81
2
1
⁄
16
52
1
⁄
4
8
1.5
0.7
3
⁄
4
20
3
3
⁄
4
95
2
7
⁄
16
62
3
⁄
8
10
2.5
1.1
1
25
4
102
2
7
⁄
16
62
3
⁄
4
20
3.0
1.4
1
1
⁄
4
32
5
127
3
3
⁄
8
86
3
⁄
4
20
5.5
2.5
1
1
⁄
2
40
5
3
⁄
4
146
3
7
⁄
8
98
3
⁄
4
20
8.0
3.6
2
50
7
178
4
3
⁄
4
121
3
⁄
4
20
13.0
5.9
2
1
⁄
2
65
9
1
⁄
4
235
5
7
⁄
8
149
1
25
22.0
10.0
3
80
10
254
6
152
1
1
⁄
4
40
30.0
13.6
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 on one psi. To obtain the Cv factor for a given size strainer,
read capacity at intersection with the one (1) psi pressure drop.
Conversions:
For gpm to lpm, multiply by 3.8
For psi to bars, multiply by .069
0.1
1
10
A
B
NPt
threads
Cap
Inlet
C
NPt
Performance Data
Table shows flow rates (gpm) at various pressure drops (psi)
for 77SI strainers using standard screens.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A Watts Water Technologies Company