The expansion valve holds again the refrigerant and maintains the substantial tension on the condenser. Inside the enlargement valve, a little orifice lets a limited level of refrigerant to continue to move. Since it flows by means of this restriction it reaches the lower force side from the valve. Also, https://www.penmann.co.uk/penmann-delivers-permanent-glycol-chiller-solution-for-ambrosia-creamery-in-lifton/