thermal expansion valve

Thermal expansion valves are often referred to generically as "metering devices".

A thermal expansion valve is a key element to a heat pump; the cycle that makes air conditioning, or air cooling, possible.

All such systems have four components: a compressor, a condenser, a thermal expansion valve (also called a throttle valve), and an evaporator.

Then, the liquid is pumped up to the processor, where it passes through a condenser (heat dissipation device) and then an expansion device to vaporize the fluid, the expansion device used can be a simple capillary tube to a more elaborate thermal expansion valve.

A thermal expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator.