If the needle and seat assembly is...

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Question 1 of 205eccef9dbacbc34ba4d45fe7

If the needle and seat assembly is excessively eroded, the valve cage assembly can be replaced. In replacing the original valve cage assembly rated at 1/2 tons, what would be the result if the replacement valve cage was oversized at 5 tons? Illustration RA-0007

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🔍 Key Concepts

• Thermostatic expansion valve (TXV) capacity rating vs. system tonnage • Effect of an oversized valve orifice/valve cage on evaporator feeding and superheat control • Dynamic behavior of a TXV: stable control vs. hunting (overfeeding then starving)

💭 Think About

• Compare what a 1/2‑ton valve is designed to do versus a 5‑ton valve on the same small system: how will the stroke and orifice size affect the amount of refrigerant admitted for small temperature changes? • Think about whether an oversized valve is more likely to give smooth, steady control or to over‑react to bulb temperature changes at the evaporator outlet. • Relate the terms overfed, starved, insufficient superheat, and excessive superheat to what is happening inside the evaporator coil when the valve repeatedly opens too much and then closes too much.

✅ Before You Answer

• Verify whether an oversized TXV tends to maintain steady superheat or causes unstable superheat control. • Check which option best describes a condition where the valve alternately allows too much refrigerant (flooding/low superheat) and then too little refrigerant (starving/high superheat). • Confirm that a valve rated at 5 tons installed on a 1/2‑ton load will behave differently than normal sizing practice, which typically aims for valve capacity close to system capacity.

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