| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure control valve for preventing an excessive deformation of or damage to an elongating and contracting container and efficiently operating a vapor compression type cycle to operate in a supercritical region. SOLUTION: The pressure control valve 3 comprises a valve casing 11 having first valve port 15 and a second valve port 16 respectively formed at a first partition wall 13 of a boundary between a refrigerant passage 7 from a radiator and an upstream side space 12a side, and a second partition wall 14 of a boundary of a downstream side space 12b side; an elongating and contracting container 18 having a sealed space 19 formed in an inner space 17 of the casing 11 to displace in response to a pressure difference in and out of the space 19; a valve 20 fixed to the container 18 to open the port 16 when the container 18 is displaced; and a check valve 21 provided in the casing 11 to open when an internal pressure in the space 12a becomes larger by a predetermined amount than that of the casing 11, refrigerant is previously sealed in the container 18 and the casing 11.
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