Air Conditioning: TEV

The valve is a pressure and temperature dependent block type flow regulator. If there is a low cooling requirement, the amount of coolant is reduced by closing the valve. If the amount of cooling increases, the valve will open slightly. This allows more fluid into the evaporator.

The thermostatic expansion valve (TEV) has a larger register than a system with a fixed choke. This is because the refrigerant volume can be more accurately controlled according to the cooling requirements.