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An automatic flush device has a valve base, a detecting and controlling unit, an outer cap assembly, a guiding base and a water-controlling unit. The detecting and controlling unit is connected to the valve base and has a solenoid valve. The solenoid valve has a piston retractably mounted on the solenoid valve and having a head formed on an end of the piston. The water-controlling unit is mounted in the valve base, is connected with the guiding base and has a water-controlling tube. The water-controlling tube has a separating segment. The separating segment is formed in the water-controlling tube to divide an inner space of the water-controlling tube into a lower passage and an upper passage. The separating segment has at least one communicating channel, a controlling channel and a bypass channel.
An automatic flush device has a valve base, a detecting and controlling unit, an outer cap assembly, a guiding base and a water-controlling unit. The detecting and controlling unit is connected to the valve base and has a solenoid valve. The solenoid valve has a piston retractably mounted on the solenoid valve and having a head formed on an end of the piston. The water-controlling unit is mounted in the valve base, is connected with the guiding base and has a water-controlling tube. The water-controlling tube has a separating segment. The separating segment is formed in the water-controlling tube to divide an inner space of the water-controlling tube into a lower passage and an upper passage. The separating segment has at least one communicating channel, a controlling channel and a bypass channel.