PURPOSE: To simplify wiring and piping structures and reduce cost by installing a valve apparatus at a terminal installed onto a sealed case by utilizing the space in the vicinity of the terminal.
CONSTITUTION: A valve apparatus 25 for opening and closing a discharge flow passage 34 is connected to a terminal 21. Said valve apparatus 25 consists of a solenoid valve, and installed into the space part 26 of a motor-coil end. The magnetic coil for driving the solenoid valve of a valve apparatus 25 is connected to the main circuit, auxiliary circuit or a common circuit of an electrical motor 17. When the electrical motor 17 is put into electric conduction, the valve apparatus 25 is opened. Said valve apparatus 25 may be installed outside a sealed case 15.