ROD AS 1067301 - Caterpillar

Illustration 1 g01129367
(9) Expansion valve Expansion valve (9) changes refrigerant of high pressure into refrigerant of low pressure. The high temperature liquid is also changed into a liquid of low pressure. The expansion valve provides a metered restriction. The metered restriction allows the high pressure liquid to be reduced to a vapor of low pressure. The expansion valve also adjusts the supply of liquid refrigerant to the evaporator coil.In order to fully exercise the evaporator coil, an adequate amount of liquid refrigerant must be supplied to the evaporator coil. The cooling effect will decrease if the amount of refrigerant that is supplied to the evaporator coil is inadequate. This is true because the liquid refrigerant vaporizes very quickly. On the other hand, if the supplied amount is too great, the excess liquid refrigerant that could not vaporize flows back to the compressor. Less cooling effect and a damaged compressor may result.