Which of the following improper operation can lead to damage to the valve stem? (Select all that apply.)
a. Use of excessive force when opening or closing a valve
b. Failure to clean and lubricate valve stems
c. Closing a valve under high pressure
d. Closing a valve under low temperatures
a. Correct. Use of excessive force when opening or closing a valve can lead to valve stem damage.
b. Correct. Failure to clean and lubricate valve stems can lead to valve stem damage.
c. Incorrect. Improperly closing a valve under high pressure does not lead to valve stem damage.
d. Incorrect. Improperly closing a valve under low temperature does not lead to valve stem damage
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