reversing valve

reversing valve

A reversing valve is a component of a heat pump that reverses the refrigerant's direction of flow, allowing the heat pump to switch from cooling to heating or heating to cooling. The reversing valve is a heat pump's sole way of switching between heating and cooling modes.


Although essential, reversing valves lower the efficiency of a heat pump for three main reasons:


  • Heat transfer between the hot and cold gases flowing through the valve
  • Pressure drops across the valve caused by bends and sharp entrances and exits
  • Refrigerant leakage from the high pressure side to the low pressure side of the valve (through clearance between the slider and seat)