ADJUSTABLE VENTURI TUBE

The present invention provides an adjustable Venturi tube, which includes a water outlet segment and a water inlet segment. The water outlet segment has a gas intake space therein and includes a chamber, a flow selector disposed on the chamber, and a gas intake pipe. The chamber has a gas intake opening and a plurality of liquid-gas exports, which are in spatial communication with the gas intake space. The flow selector has a plurality of selective channels respectively facing the liquid-gas exports. The gas intake pipe can be in spatial communication with the gas intake space through the gas intake opening. The water inlet segment has a space and a water channel that is in spatial communication with the space. By a relative movement between the water inlet segment and the flow selector, the space can be in spatial communication with at least one of the selective channels through the water channel, selectively.