🔍 Key Concepts

• Valve packing function and purpose in sealing around a moving stem • How mechanical damage to a valve stem affects the packing • Difference between operating a valve improperly and damage to the sealing surface

💭 Think About

• Which choice would directly damage the smooth surface that the packing must seal against? • Which options are more about how the valve is operated, versus a condition that would continuously chew up or wear out the packing? • If packing is replaced correctly but still fails early, which condition would keep scratching or cutting into it every time the valve moves?

✅ Before You Answer

• Identify which option describes physical damage to the stem surface rather than just operating habit • Ask whether the problem would cause continuous wear on the packing, not a one-time event • Consider which condition would most likely lead to excessive leakage AND frequent repacking even when installed correctly