Process Control System
Process Control System
Process Control System
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B6 – 2<br />
Description of controlled systems<br />
B.6.2 – Flow control<br />
Two modes of operation are used on the assembled flow control<br />
system:<br />
• Flow control with the help of a proportional valve.<br />
The correcting variable in this case is the stroke of the valve piston,<br />
the pump P runs constantly.<br />
• Flow control with the help of the pump.<br />
In this case, the correcting variable is the speed of the pump.<br />
The changeover between the two modes of operation can be made<br />
simply via manually operated stop cocks.<br />
Fig. 6.2:<br />
Flow diagram of flow control<br />
FIC<br />
20<br />
HSO<br />
20<br />
V ab<br />
P<br />
FI<br />
20<br />
a<br />
<strong>Process</strong> <strong>Control</strong> <strong>System</strong> • Festo Didactic
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