Dimensions, Flow rates – Watts FS20 User Manual
Page 2
Dimensions
3
1
⁄
4
"
(82mm)
3
1
⁄
4
"
(82mm)
2
5
⁄
16
" (59mm)
11
3
⁄
16
" (284mm)
3
1
⁄
4
" (82mm)
7
⁄
8
" (22mm)
1
7
⁄
8
" (48mm)
HEX
1
⁄
2
" (15mm)
Threaded
Conduit
Hut
1" (25mm)
Pipe Thread
1
3
⁄
8
" (35mm)
Flow Rates
FLOW RATES Required to Actuate the FS20 Flow Switch in
Horizontal Pipe. Flow rates in U.S. gallons per minute (GPM).
Velocity in feet per second (FPS). *Equipped with extended
paddle trimmed to pipe size.
PIPE SIZE IN WHICH
25mm
32mm
40mm
50mm
65mm
80mm
100mm
125mm
150mm
FLOW SWITCH INSTALLED
1"
1
1
⁄
4
"
1
1
⁄
2
"
2"
2
1
⁄
2
" 3"
*4"
*5"
*6"
ACTIVATION
GPM
5.2
7.9
10.0
13.2
20.9
30.0
39.0
58.0
79.0
FLOW
FPS
2.01
1.74
1.62
1.29
.92
1.30
1.0
.94
.88
DEACTIVATION
GPM
2.0
3.2
5.3
8.1
9.9
12.0
19.0
29.0
39.6
NO FLOW
FPS
.77
.71
.86
.79
.44
.52
.50
.47
.44
ACTIVATION
GPM
11.5
18.0
18.0
34.1
53.9
52.0
73.5
115.0
166.0
FLOW
FPS
4.44
3.98
2.91
3.33
2.38
2.26
1.86
1.85
1.84
DEACTIVATION
GPM
8.5
14.6
15.1
29.2
44.4
46.1
64.0
92.0
123.0
NO FLOW
FPS
3.28
3.23
2.44
2.85
1.96
2.00
1.67
1.48
1.37
*Flow rates for these sizes are calculated.
FACTORY OR
MINIMUM
FLOW SETTING
MAXIMUM
FLOW SETTING
ES-FS20 0921
© 2009 Watts
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
ES-FS20.qxd 6/9/09 10:00 AM Page 2