PURPOSE:To improve the responsiveness of a valve by opening or closing a high-pressure side inlet port communicated into an enclosed container, a high- pressure side outlet port communicated to a discharge pipe and a low-pressure port communicated to a low-pressure chamber with a disk-shaped high-pressure valve. CONSTITUTION:When an operation of a compressor is stopped, the high-pressure gas in an enclosed container 51 is leaked into a low-pressure chamber 61, and the pressure in the low-pressure side port 76 is increased by the gas pressure flowing via a pressure guiding passage 79. When the pressure in the low-pressure port 76 and the pressure in the enclosed container 51 is made equal, a disk- shaped high-pressure valve 77 is separated from the low-pressure side port 76 by the force of a bias spring 78 and concurrently blocks a high-pressure side inlet port 72 and a high-pressure side outlet port 74 communicated into the enclosed container 51 and cuts off the communication between a discharge pipe 73 and the enclosed container 51. Since the disk-shaped high-pressure valve 77 is freely arranged in a valve cylinder 75, it has no sliding portion, and the response speed can be improved.
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