USCG USCG General Eng
Set 17 • Question #241 of 498
Launch Interactive Practice Room 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?
A
A centering spring has broken and jammed the spool movement preventing the spool from recentering.
✓ Correct Answer
B
One of the two solenoids has sustained an open in its respective coil.
C
The pump coupling has been damaged preventing the pump from developing its required operating speed.
D
The detent mechanism has failed, preventing the valve from operating.
USCG NMC Regulatory Explanation
In USCG Marine Engineering General Subjects, for engine room systems involving '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', the standard operating requirement is: 'A centering spring has broken and jammed the spool movement preventing the spool from recentering.'.
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