Entspannungsventil mit Unterkühlungsgradregelung

摘要

In a supercooling degree control type expansion valve a differential pressure regulating valve (4, 5 6) is provided upstream of a restriction passage 8. Valve element 5 contains or defines an oil passage 11 even when the differential pressure regulating valve is closed during low load operation of the compressor, to allow refrigerant to flow at a minimum flow rate and to return oil contained in the refrigerant to the compressor, whereby the seizure of the compressor can be prevented.