Patent ID: 7124749

Claim:
An air transfer apparatus comprising: an air pump transferring air to a shielded section; and a check valve disposed in a passage through which the air is transferred by said air pump, said check valve comprising: a spring urging said valve body to be closed; and an actuator operating a valve body to open, wherein said check valve is capable of performing a desired opening/closing operation, wherein said check valve is held in a closed state when said actuator does not operate, while being held in an opened state when said actuator operates, wherein an urging force for valve closing by said spring is set to be a value by which said valve body is held in a closed state thereof, even if a primary side pressure of said valve body is maximized by said air pump, and wherein said actuator generates, according to a control signal, a driving force for opening said valve body against the urging force for valve closing by said spring.