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What are the symptoms of a faulty expansion valve?

1 Answers

DelAniyah

07/25/25 9:07am

Insufficient liquid supply, resulting in low refrigerant flow rate. Excessive liquid supply, causing liquid return. Fluctuating liquid supply. The following is an introduction to the expansion valve: 1. Expansion valve: It is an important component in the refrigeration system, usually installed between the liquid receiver and the evaporator. The expansion valve consists of three main parts: the valve body, the temperature sensing bulb, and the equalizer tube. 2. Temperature sensing bulb: The temperature sensing bulb is filled with refrigerant in a saturated gas-liquid equilibrium state, and this part of the refrigerant is not connected to the refrigerant in the system. 3. Equalizer tube: One end of the equalizer tube is connected to a position slightly away from the temperature sensing bulb at the evaporator outlet, and is directly connected to the valve body through a capillary tube. Its function is to transmit the actual pressure at the evaporator outlet to the valve body. 4. Quality judgment: The ideal working state of the expansion valve should be to change the opening degree in real time according to the change of the evaporator load and control the flow rate. However, in reality, due to the delay in heat transfer of the temperature sensed by the temperature sensing bulb, the response of the expansion valve is always a step behind.

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