What is the application of a Liquid Line Differential valve in hot gas defrost Systems?
Some hot gas defrost systems, for example multiple evaporators, require the liquid in the evaporator to be returned to the liquid line. This requires a slightly lower pressure in the liquid line to allow the flow to take place. A differential regulator creates this pressure drop. The regulator is often fitted with a solenoid valve which is energized when the system is not in defrost, opening the regulator wide to remove the pressure drop.
