A solenoid, direct-acting, three-position,...

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Question 1 of 205eccef9cbacbc34ba4d4592b

A solenoid, direct-acting, three-position, spring-centered, directional control valve is used in a hydraulic system to control a linear actuator. Midway through extension, the push button is released, but the actuator continues to extend slowly. Which of the following conditions represents the probable cause?

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🔍 Key Concepts

• Spring-centered, three-position directional control valves and how the spool should behave when the solenoid is de‑energized • What happens to flow to a linear actuator when the valve spool does not fully return to center vs. when the pump or solenoid fails • Differences between problems that affect the entire hydraulic system (like pump issues) versus problems isolated to one valve/spool position

💭 Think About

• When you release the push button on a spring-centered valve, what SHOULD happen inside the valve, and what SHOULD the actuator do at that moment? • Which of the listed failures would cause the actuator to keep moving in the same direction, but at a reduced (slow) speed, rather than stopping completely or failing to move at all? • Does a damaged pump coupling or an open solenoid coil explain movement that continues only after you release the button, or would they affect system behavior all the time?

✅ Before You Answer

• Check which options are consistent with a spring-centered, three-position valve (and which mention features that normally go with a different style, like detent valves). • For each choice, decide: would this failure make the actuator (1) stop, (2) not start, (3) move randomly, or (4) keep moving slowly in the commanded direction after releasing the button? • Verify which condition would hold the spool off its true center position, allowing only restricted flow to the actuator and causing slow, continued extension.

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