🔍 Key Concepts

• How valve symbols show the number of ports (2-way, 3-way, 4-way) using external connection points around the box • How the number of internal boxes in the symbol tells you the number of discrete positions (3‑position vs 4‑position vs "infinite") • How the actuator symbols (lever, spring, detent, pneumatic pilot) are drawn at the ends of a directional control valve symbol

💭 Think About

• Look closely at the symbol for item A: how many separate internal boxes are stacked inside the outer rectangle, and what does that say about discrete positions versus infinite positioning? • Count how many external lines/ports connect to the valve body at A. Which choices are compatible with that number of ports? • Check both ends of the valve symbol at A. What is drawn at the bottom and at the top? Do these shapes indicate manual/lever, pneumatic, spring return, or detent operation?

✅ Before You Answer

• Verify whether the valve at A has four distinct ports connected into it, matching the wording of any option • Verify whether there is a spring symbol on one end (triangular/zigzag) and a manual or detent symbol on the other end • Confirm whether the drawing shows discrete positions (separate internal boxes) or a single adjustable position that could be called "infinite"