CRYOGENIC TEMPERATURE REFRIGERATING MACHINE

PROBLEM TO BE SOLVED: To provide a cryogenic temperature refrigerating machine capable of using the compressor of a low flow rate. SOLUTION: A compressor unit 1 is connected to a cold generating unit 2 through a passage selector valve 12. The passage selector valve 12 is formed with a four-way valve. The first port 14 of the passage selector valve 12 formed with the four-way valve is connected to and communicates with the high pressure gas passage 5 of the compressor unit 1, a second port 15 is connected to and communicates with the low pressure gas passage 11 of the compressor unit 1, a third port 16 is connected and communicates with the cold generating unit 2 and a fourth port 17 is connected and communicate with a buffer tank 18, respectively. The cold generating unit 2 selectively communicates with the high pressure gas passage 5 of the compressor unit 1, the low pressure gas passage 11 or the buffer tank 18 in accordance with the switching operation of the passage selector valve 12.