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

Question 1 / 205eccef9cbacbc34ba4d4592c

Question 1 of 205eccef9cbacbc34ba4d4592c

A solenoid, direct-acting, three-position, spring-centered, directional control valve is used in a hydraulic system to control a linear actuator. With the actuator under load there is no movement. However, when the load is removed the actuator can be cycled in both directions, although slower than normal. Which of the statements listed is the probable cause?

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🔍 Key Concepts

• Behavior of a spring-centered, three-position directional control valve in neutral and actuated positions • Effect of pump speed and output flow on actuator movement under load vs no load • Symptoms of open solenoid coil vs mechanical damage to pump coupling

💭 Think About

• Ask what condition would allow the actuator to move in both directions with NO load, but not move at all when the normal load is applied. • Consider which fault would affect overall flow and pressure to the entire system, not just one direction or solenoid. • Think about what happens to actuator speed if the pump cannot reach its rated speed. How would that show up in the operation you see described?

✅ Before You Answer

• Compare which options would prevent any movement regardless of load, versus those that mainly reduce available power/flow. • For each choice, decide: would this fault likely affect both directions of travel equally, as described? • Verify which component—valve, solenoids, or pump coupling—could cause the actuator to work only when the load is removed and to move more slowly than normal.

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Question 1 of 20

One or both of the centering springs has broken and the spool has jammed in the valve body.

One or both of the solenoid coils has sustained an open.

The pump coupling is damaged and the pump is unable to attain its rated speed of rotation.

The pump coupling has sheared and the motor is over speeding.

Question 1 / 205eccef9cbacbc34ba4d4592c

Question 1 of 205eccef9cbacbc34ba4d4592c

Back

Question 1 of 20

5eccef9cbacbc34ba4d4592c

No comments yet

Be the first to share your thoughts!

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed