Know the theory behind the diagrams. The symbols on a pneumatic valve represent the parts and the methods of the functioning valve. Explain the symbols by describing the parts and actions they represent in the most basic way possible. Students will remember better what the symbols mean when they understand what they represent in the big picture.
Explain the valve symbols individually and by similar appearance or function. For instance, the block and the actuator symbol both appear like a part of a square or a whole square. However, although the angled lines of the arrow symbols and the return spring symbol appear similar, they represent very different actions and concepts: the arrows symbolize the direction that gases flow, while the return spring symbol represents a solenoid valve in its resting position.
Clarify the symbols that change according to the position of the part they represent. For example, the symbol may change depending on whether it represents a part at rest or a part operating.
Demonstrate examples of how reading the pneumatic valve symbols accurately might be important in a project. Explore the consequences of what could happen if similar appearing symbols were confused for each other, or if a symbol was interpreted to represent a part at rest when, in fact, the part was in action. Offer concrete scenarios like repairing a valve or troubleshooting a malfunctioning valve.