Lesson 2 - Principles of Process Control
Completion requirements
Done: View
To do: Go through the activity to the end
This lesson explores exactly what process control is and explains why it is important. It examines the various levels within process control systems and identifies the associated equipment. It also takes a detailed look at the various automation communication and control elements.
Valves
Valve symbols vary greatly, however as long as you follow a system, this does not really influence how you read a P&ID. There are different symbols for the valves themselves, and more importantly, from a control point of view, for the different types of actuators.
The figure below shows common valves and the common types of actuators:
Figure: Valve and actuator symbols