What's inside a Thermal Expansion Valve TXV - how it works hvac

What's inside a Thermal Expansion Valve TXV - how it works hvac

What's inside a Thermal Expansion Valve TXV - how it works hvac
What's inside a Thermal Expansion Valve TXV - how it works hvac

A thermal expansion valve or thermostatic 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 released into the evaporator thereby keeping superheat, that is, the difference between the current refrigerant temperature at the evaporator outlet and its saturation temperature at the current pressure, at a stable value, ensuring that the only phase in which the refrigerant leaves the evaporator is vapor, and, at the same time, supplying the evaporator's coils with the optimal amount of liquid refrigerant to achieve the optimal heat exchange rate allowed by that evaporator. In addition, some thermal expansion valves are also specifically designed to ensure that a certain minimum flow of refrigerant can always flow through the system. 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.

Whats inside a thermal expansion valve and how the thermostatic expansion valve or TXV works in a HVAC refrigeration system and the basic working principles that allow it to meter the flow of refrigerant into the evaporator of chillers and ac units.

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