HOW THINGS WORK….THE TEV (thermostatic expansion valve)

From the positioning of its parts, it may seem like the principle of TEV operation is bulb pressure opposing spring pressure. But this is not the case. Evaporator pressure is a key factor in the operation of a thermostatic expansion valve. It is always equal to the pressure corresponding to refrigerant saturation temperature.

A thorough knowledge of the relationship among these three pressures is needed for complete understanding of valve operation.

An excerpt from the Technical Institute Manual #1 from the Refrigeration Service Engineers Society.

To find out more, visit the RSES online store for your copy: RSES.ORG

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