PURPOSE:To operate smoothly a high pressure valve by providing the high pressure side inlet port opening to a high pressure valve section for closing the high pressure side refrigerant path in stoppage to make gas flow jet toward the generally central portion of said valve. CONSTITUTION:A disk-like high pressure valve 77 for closing the low pressure side port 76 with one end face and interrupting communication between the high pressure side inlet and outlet ports 72, 74 with the other end face to close the high pressure side refrigerant path in stoppage is disposed in a valve cylinder 75 formed in a cylinder plate 57. And the high pressure side inlet port 72 is formed inclined from the outside in a side plate 55 to jet gas toward the generally central portion of the high pressure valve 77. By such constitution, gas flow jetted from the high pressure side inlet port 72 in start collides with the generally central portion of high pressure valve 77 to prevent said valve 77 from excessive inclination so that said valve 77 can be smoothly operated.
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