🔍 Key Concepts

• In hydraulic schematics, a diagonal arrow across a symbol has a specific meaning that is the same whether it’s on a pump, valve, or other component. • Compare the symbols in Fig. D, E, and F (which show different valve functions) with the symbols in Fig. A, B, and C, focusing only on what the diagonal arrow is doing. • Think about how a schematic would show a component whose setting you can change versus a component that has a fixed setting.

💭 Think About

• Look at other hydraulic symbols you’ve seen (pumps, relief valves, flow control valves). When you see a diagonal arrow drawn across the main symbol, what common idea do they share? • Which option describes a general property that could apply to all three shapes in A, B, and C, regardless of whether they are valves, pumps, or other devices? • If a component were one‑direction only or pilot controlled, how would that normally be shown symbolically—by an arrow across the body, or by a special internal check symbol or extra pilot line?

✅ Before You Answer

• Make sure you are focusing on the arrow drawn across the component, not the basic shape of the component itself. • Ask yourself: does this graphic convention appear on many different kinds of hydraulic components whenever that component’s setting is changeable by the operator or system? • Verify which answer choice describes a feature that is not limited to valves only but could fit any component type shown in A, B, and C.