The selection of the expansion valv

The selection of the expansion valve should determine the type and specification of the expansion valve required by the unit according to the cold (hot) load of the required heat pump unit or refrigeration unit, and the thermal expansion valve that is too large or too small must be avoided. because when the expansion valve is too small, it will not be closed until a new balance is found, and the thermal expansion valve that continues to open will not play a controlling role, when the expansion valve is too large, If it can not reach the normal superheat, it will reduce the superheat or even make it fall to zero. Too low superheat will inevitably reduce the stability of the compressor and affect the normal operation of the compressor.