If plant air or electric is restored, the pilot or solenoid resets, flow path is restored and the volume tank gradually fills with air which is locked in with a check valve.

• 当主气源或电源恢复正常，则导阀或电磁阀就重新设置，罐内气体重新加注，充满后配置的止回阀将关断气源流径，而将气体储存在备用气源罐内。