Tecfluid SC250H - Manual (Page 5)

5
So that flowmeter works at the calibration pressure (nominal working pressure) and to
obtain a back pressure that will maintain the float equilibrium, the regulating valve should
be mounted as shown in Figure 1.
The flow should be controlled by the regulation valve (2), while keeping the shut off valve
(1) fully open. The by-pass valve should be fully shut off.
4.2 Liquid flow measurement (Figure 2)
When measuring liquids the regulation valve (1) should be installed as shown in figure 2.
The by-pass valve should remain closed. Being the shut off valve (2) partially open, open
the regulation valve (1) slowly until the needle of the indicator housing shows a low flow
rate. Then the shut off valve (2) is also opened slowly so as to get rid of the air and then
progressively fully opened.
The required flow is then regulated by using the inlet valve (1).
Close the valves during work stoppages or, at the end of the working day to stop sudden
surges when started up. If the float hits the stops sharply this could cause damage to the
meter.
3. BY-PASS
VALVE
2. REGULATION
VALVE
1. SHUT OFF
VALVE
2. SHUT OFF
VALVE
INSTALLATION FOR
GASES INSTALLATION FOR
LIQUIDS Figure 1 Figure 2
3. BY-PASS
VALVE
1. REGULATION
VALVE