My article in the Aug. 2 issue of The News reviewed conventional thermostatic expansion valves (TEVs or TXVs) and covered the basic operation of electronic expansion valves (EEVs). This column will ...

The thermostatic expansion valve (TEV or TXV) is erroneously considered by some to be a mysterious and complex device. As a result, many valves are needlessly replaced when the cause of the system ...

and controls the freon flow through the system (and the pressure difference between the two sides). The inlet side of the valve is at high pressure and the freon is a room temperature liquid at this ...