What is the main purpose of a thermostatic expansion valve (TXV)?

The main purpose of a thermostatic expansion valve (TXV) is to control refrigerant flow within a refrigeration or air conditioning system. This device plays a critical role in regulating the amount of refrigerant that enters the evaporator based on the cooling demand. The TXV adjusts the flow of refrigerant in response to changes in the temperature or pressure of the evaporator, ensuring optimal heat exchange and system efficiency.

By precisely controlling the refrigerant flow, the TXV helps maintain the correct superheat level, which is crucial for preventing liquid refrigerant from returning to the compressor. This ensures the compressor operates safely and efficiently, helping to maintain the overall performance of the HVAC system.