When a thermostatic expansion valve is installed in a refrigerated container unit, the sensing bulb almost always requires insulation. Why is this so?

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Accepted Answer

the insulation prevents air stream temperatures from influencing the bulb temperature

Answer

the insulation protects the clamp and screws from corrosion

Answer

the insulation prevents the bulb from vibrating loose

Answer

the insulation prevents oil entrained in the suction gas from influencing the bulb temperature

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