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

Question 1 / 205eccef9cbacbc34ba4d4592b

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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Question 1 of 20

A centering spring has broken and jammed the spool movement preventing the spool from recentering.

One of the two solenoids has sustained an open in its respective coil.

The pump coupling has been damaged preventing the pump from developing its required operating speed.

The detent mechanism has failed, preventing the valve from operating.

Question 1 / 205eccef9cbacbc34ba4d4592b

Question 1 of 205eccef9cbacbc34ba4d4592b

Back

Question 1 of 20

5eccef9cbacbc34ba4d4592b

No comments yet

Be the first to share your thoughts!

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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