An electric motor driven (torque producing)...

Question 1 / 205eccef9bbacbc34ba4d453ed

Question 1 of 205eccef9bbacbc34ba4d453ed

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?

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🔍 Key Concepts

• 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

💭 Think About

• 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?

✅ Before You Answer

• 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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Question 1 of 20

Alternately depress the 'close' and 'open' buttons to get the valve open.

Manually engage the actuator hand wheel and 'break' the valve disk from its seat, then push the 'open' button.

Secure power, tag out system and make repairs because the valve stem has sheared.

Secure the breaker to this device, then switch the motor leads and push the 'open' button.

Question 1 / 205eccef9bbacbc34ba4d453ed

Question 1 of 205eccef9bbacbc34ba4d453ed

Back

Question 1 of 20

5eccef9bbacbc34ba4d453ed

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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