| 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 body 12 having a first valve port 13a and a second valve port 14a respectively formed at an upstream side space 7a side and a downstream side space 7b side of a refrigerant passage 7, an elongating and contracting container 17 provided in the body 12 and having a sealed space 17a formed therein to elongate or contract in response to a pressure difference in and out of the space 17a, a temperature sensitive cylinder 11 provided in the passage 7 near an outlet of a radiator to communicate with the container 17 through a tube member 10 to transfer a refrigerant temperature near the outlet of the radiator into the container 17, a valve 16 fixed to the container 17 to open the port 14a when the container 17 is displaced, and a check valve 15 provided in the body 12 to open the port 13a when an internal pressure of the space 7a becomes larger than that of the body 12.
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