3
CAPACITIES
RECOMMENDED INSTALLATION PRACTICES
Water hammer and surges can be damaging to any flowmeter and must always be avoided.
Water hammer occurs when a liquid flow is suddenly stopped as with quick closing and solenoid operated valves. Surges
occur when flow is suddenly begun, as when a pump is turned on at full power or a valve is quickly opened.
Liquid surges are particularly damaging to flowmeters if the pipe is originally empty. To avoid damaging surges, fluid lines
should remain full (if possible) and pumps should be brought up to power slowly and valves opened slowly. In addition, to
avoid both water hammer and surges, a surge chamber should be installed.
WARNING
FLOWMETER OPERATION
If the inlet and outlet valves adjacent to the flowmeter are to be closed for any reason, the flowmeter must be completely
drained. Failure to do so may result in thermal expansion of the liquid which can cause rupture of the meter and possible
personal injury.
MAXIMUM FLOWRATE
Pressure Drop Pressure Drop
Part No.
Water (gpm)
Inches W.C.
Inches W.C.
w/o Valve
w/Valve
FL-1210
.08-.8
12.6
13.6
FL-1211
.15 -1.5
22.2
27.0
FL-1212
.25-2.5
61.0
85.2
FL-1213
.35-3.5
88.7
121.0
FL-1214
.5-5.0
172.0
238.0
Pressure Drop Pressure Drop
Part No.
Air (scfm)
Inches W.C.
Inches W.C.
W/o valve
W/Valve
FL-1201
.34-3.4
14.34
15.5
FL-1202
.6-6.0
25.34
30.8
FL-1203
1.2 -12.0
69.34
97.3
FL-1204
1.5 -15.0
101.34
138.3
TYPICAL INSTALLATIONS
