The temperature controlic expansion valve (TXV) is a metering device designed to regulate the rate at which your refrigerant flows into the evaporator.
This regulated flow is essential in maximizing the efficiency of your evaporator while preventing excess refrigerant from returning to your compressor.
In heating and cooling systems, the thermal expansion valve is often found near your heating coil. The most respected thermal expansion valve problems include flooding, starving, and hunting! Flooding happens when the thermal expansion valve releases too much liquid refrigerant to the evaporator, more than it can evaporate. As a result, the liquid goes back to the compressor, causing it to malfunction. This can cause compressor noise, and frosting, higher pressure levels, and low superheat, less refrigerant evaporation than required. The reasons for flooding ranges from the superheat setting is inproperly configured, causing the TXV not to function properly to too much moisture in the TXV or frozen TXV that is causing superheat to be overlooked, to dirt and debris in the TXV or in the refrigerant lines, leading to improper functioning of the TXV work… Damages such as leaking or improper functioning, or refrigerant valve that is too pressing for your TXV, and a TXV head that is improperly positioned also cause flooding. Starving, which is the opposite of flooding, occurs when the refrigerant is incapable of reaching your evaporator, causing your evaporator to overload, operate at unsteady high un-even temperatures, or prompt low suction pressure, hunting is when your thermal expansion valve opens and closes too fast, allowing too little or too much liquid refrigerant to pass through and causing superheat to fluctuate.