An electric motor driven (torque producing) remotely controlled, valve actuator is installed on the high sea suction with the 'red' indicator light illuminated. When the 'open' push button is depressed, the 'green' indicator light comes on momentarily and then goes out, without any appreciable movement of the valve. Which of the following actions should be carried out?
• Motor-operated valve actuators and how torque is transmitted to a stuck valve • Difference between an electrical fault versus a mechanical sticking/binding of the valve disk on its seat • Proper troubleshooting sequence before securing power, swapping leads, or assuming parts are broken
• What does it suggest if the green light comes on briefly (power and start signal present) but the valve does not move appreciably? Does that point more toward an electrical open circuit, a wrong rotation, or a mechanically stuck valve? • In a shipboard engineering plant, what is the safest, least invasive action you can take first when a valve appears to be stuck, before you secure power and assume broken parts or rewire anything? • Which options involve potentially dangerous or irreversible changes (like changing wiring or assuming a sheared stem) versus options that simply help free a stuck valve so the actuator’s torque can then move it?
• Verify which choice addresses a likely stuck valve disk on the seat rather than a fully failed motor or broken stem. • Check which option avoids unnecessary electrical modifications (like changing motor leads) during initial troubleshooting. • Confirm that the chosen action allows you to use the actuator again after assisting the valve mechanically, instead of immediately taking the system out of service.
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