A solenoid direct-acting three-position...

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Question 1 of 205eccef9cbacbc34ba4d4592a

A solenoid direct-acting three-position spring-centered directional control valve is used in a hydraulic system to control a linear actuator. When the remote push button is depressed to extend the actuator it fails to move, even though the pump is in operation. Which of the following statements represents the cause?

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🔍 Key Concepts

• Direct-acting, spring-centered, three-position directional control valve operation • Difference between electrical failure of a solenoid coil and mechanical jamming of the spool • How a damaged pump coupling / low pump speed affects all actuator functions, not just one direction

💭 Think About

• Think about what specific component is being used to extend the actuator and what the push button actually energizes. • Ask yourself: if the actuator can (or could) move in the other direction, what does that say about the pump and the mechanical condition of the valve spool? • Consider whether a hydraulic problem that affects the whole system would only stop extension, or would it also prevent retraction and other functions.

✅ Before You Answer

• Verify what happens internally in a spring-centered 3-position valve when the coil for the extend position is not energized or is open. • Check whether a broken/ jammed spring at one end of the spool would stop only extension or would interfere with all spool movement. • Confirm whether a damaged pump coupling / low speed would allow any actuator motion, or would cause problems in every direction and every function.

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