Question 117General Subjects - QMED

The correct answer is D) The torque limit switch protects the valve from being damaged if a foreign object prevents the valve from fully closing. The purpose of the torque limit switch on an electric motor operated rising stem gate valve is to prevent damage to the valve in the event that a foreign object obstructs the full closure of the valve. As the valve is closing, the motor applies torque to the valve stem. If the valve encounters an obstruction and cannot fully close, the torque limit switch will detect the excessive torque and shut off the motor, protecting the valve from potential damage. The other options are incorrect because they do not accurately describe the purpose of the torque limit switch. The switch is not intended to protect the motor, but rather the valve itself from damage caused by an obstruction during the closing process.