1. Change the pilot pressure on the spool and observe how the spool moves against the spring.
2. Watch how the changing orifice size, changes the flow through the valve.
3. Change the load pressure and note how the pressure drop across the spool changes, and therefore the flow changes.
4. Consider what pressures will exist on either side of each spool lands. Use this information to predict where leakage will flow to.
5. Operate the spool to see the effects on hysteresis from the seal.
6. Operate the spool to see how the trapped volume effects its speed of movement.