The expansion valve retains back the refrigerant and maintains the substantial force of your condenser. In the expansion valve, a small orifice enables a restricted volume of refrigerant to carry on to move. As it flows by means of this restriction it reaches the minimal stress aspect of your valve. https://www.penmann.co.uk/penmann-delivers-permanent-glycol-chiller-solution-for-ambrosia-creamery-in-lifton/