Which of the following statements describes the accepted method for testing a thermostatic expansion valve?

Correct Answer: Option D — Place the sensing bulb in ice water and then warm by hand. Observe flood-through and temperature change at the suction line.

Validating thermal expansion valve operation involves chilling the sensing bulb in ice water and warming it by hand to monitor dynamic evaporator response, ensuring the valve properly modulates refrigerant feed in accordance with marine refrigeration thermodynamic principles.