The growth valve retains again the refrigerant and maintains the high stress on the condenser. In the expansion valve, a small orifice permits a limited degree of refrigerant to carry on to flow. Because it flows by way of this restriction it reaches the lower force facet of the valve. https://www.penmann.co.uk/penmann-delivers-permanent-glycol-chiller-solution-for-ambrosia-creamery-in-lifton/