The most important function of four-way valve is : to remove the frost on evaporator by chaning the refrigerant flowing direction.

During the low-temperature heating process of the heat pump, frosting will inevitably occur in the evaporator, and the thickness of the frost layer will gradually increase with time passing, gradually the frost will reduce the heating capacity of the heat pump.

Therefore, in order to maintain the heat exchange capacity and improve the heat exchange efficiency of the heat exchanger, it is necessary to switch the refrigerant through the four-way valve to make heat pump defrost.

Company Profile