| 摘要 |
PROBLEM TO BE SOLVED: To provide an expansion valve which prevents refrigerant circulating within a refrigeration cycle from flowing into the lower space of a diaphragm of an element part.SOLUTION: The box type expansion valve for adjusting the flow amount of the refrigerant corresponding to the degree of overheating of the refrigerant in the evaporator outlet of the refrigeration cycle, includes: a throttle passage oriented to the evaporator inlet; a low pressure passage through which the refrigerant moving to a compressor from the evaporator outlet; an element part divided into an upper space and a lower space with a diaphragm; and a work rod for transferring the displacement of the diaphragm to the throttle open displacement of a valve body. The lower space and the low pressure passage are closed except for a pressure equalizing hole allowing the lower space to communicate with the low pressure passage, and the flow-in of the refrigerant liquid droplets passing through the low pressure passage is made to be suppressed in the lower space passing through the pressure equalizing hole. |
