The main cause of ice blockage before the expansion valve

Ice blockage before the expansion valve is one of the most common and troublesome problems of insufficient liquid supply in refrigeration systems. Once ice blockage occurs, the refrigerant cannot be supplied, the evaporator will be "underfed", and the refrigeration effect will immediately deteriorate. There are three main reasons for the formation of ice blockage:

(1) Too much moisture in the refrigerant: When the moisture content in the refrigerant exceeds the standard, at the moment when the expansion valve throttles and cools down, the moisture will form ice crystals and block the valve port.

(2) Too low evaporation temperature: If the system's low pressure is too low, the refrigerant will flash and cool down in advance before the expansion valve, freezing the moisture into ice.

(3) Clogged filter: A clogged filter will reduce the incoming liquid pressure, which also causes the refrigerant to flash and freeze in advance.

As long as the moisture content of the refrigerant is controlled, the system pressure is kept normal, and the filter is cleaned regularly, ice blockage can be effectively avoided, ensuring the stable operation of the system.