Component of air conditioning and refrigeration systems
Basic construction of a TEV. The flexible diaphragm actuates the poppet valve; an increasing pressure in the sensing bulb will press down on the poppet and open the valve further. There is also an adjustable spring providing a closing force on the valve which controls the superheat.The sensing bulb is positioned near the end of the evaporator and ensures enough refrigerant flows to chill the whole evaporator, but not so much that liquid reaches the sensing position. The equalisation connection is needed when the pressure at the sensing position differs from the pressure at the valve output.
A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator to a steady value. Although often described as a "thermostatic" valve, an expansion valve is not able to regulate the evaporator's temperature to a precise value. The evaporator's temperature will vary only with the evaporating pressure, which will have to be regulated through other means (such as by adjusting the compressor's capacity).
Thermal expansion valves are often referred to generically as "metering devices", although this may also refer to any other device that releases liquid refrigerant into the low-pressure section but does not react to temperature, such as a capillary tube or a pressure-controlled valve.
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