Abstract: Self-cleaning dental suction device comprising a collection tank having an inlet pipe oriented at a downward angle that intersects an interior wall of the tank in a manner to provide a self-cleaning swirling action of liquid waste and solid debris on the interior wall of the tank, a motor operably associated with the collection tank for generating a relative vacuum therein, and a drainage valve communicated to the collection tank for draining the contents of the collection tank. The tank vacuum is discontinued when the tank liquid level reaches a maximum level by a float valve closing off communication between the motor and the collection tank or when the vacuum motor is de-energized.

Abstract: Dental suction device comprising a collection tank, a motor operably associated with the collection tank for generating a relative vacuum therein, and a flapper release valve disposed inside a downwardly extending drain conduit communicated to the collection tank and opening when the motor is inoperative for draining the contents of the collection tank through the drain conduit when the motor is inoperative. The collection tank comprises a reinforced plastic tank having an enlarged internal capacity to provide at least day-long collection such that there is no interruption in the operation of the dental suction device during a working day.