What does a TXV (Thermostatic Expansion Valve) do in a refrigeration system?

A Thermostatic Expansion Valve (TXV) plays a crucial role in a refrigeration system by regulating the flow of refrigerant based on the cooling demand of the system. It adjusts the amount of refrigerant that enters the evaporator coil, allowing for optimal heat absorption. When there is a higher cooling demand, such as when temperatures rise inside the conditioned space, the TXV will open wider to allow more refrigerant to flow. Conversely, during periods of lower demand, it will reduce the flow, helping to maintain efficiency and prevent flooding of the evaporator. This response to varying conditions ensures that the refrigeration system can operate efficiently and effectively.

The other options do not accurately describe the primary function of a TXV. Maintaining constant pressure is typically achieved through other components in the system, such as pressure regulators. Checking for leaks in the coil is not a function of the TXV but rather a maintenance task that may involve other inspections or tools. Enhancing refrigerant evaporation is more closely related to the overall design of the evaporator and the type of refrigerant used rather than the specific job of the TXV, which is focused on regulating flow in response to temperature changes.