Expansion Valve

Front View of a Expansion Valve


An air conditioner’s expansion valve controls how much refrigerant is allowed to flow from the condenser coil into the evaporator coil. By doing so, it helps the evaporator coil to work more efficiently, allowing enough refrigerant into the evaporator coil so that it’s chilled to the proper temperature. And, by preventing refrigerant from entering the evaporator coil once it’s properly chilled, the expansion valve keeps liquid refrigerant from flowing to the compressor.


Thermal Expansion Valve, Thermostatic Expansion Valve, TX Valve, Metering Device


TEV, TXV, TX Valve

Related Terms

Amp Clamp

Amp Clamp

An amp clamp is an electronic device that has clamps, used to measure amperage.



Common type of refrigeration used in older home AC systems



Brand name for a type of refrigerant used in air conditioning systems

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