Automatic swimming pool cleaning device

An automatic swimming pool cleaning device for use with a water vacuum and filter system, the device comprising:

• a flexible cleaning member adapted to contact an underwater surface of the pool;
• a tube mechanically coupled to the cleaning member and adapted to be connected to a water vacuum hose wherein water and pool surface contamination will be drawn by suction from underneath said cleaning member through the tube to the water filter system before being returned to the pool;
• and
• a flexible valve member mounted proximate a throat region of said tube, wherein said throat ration is provided with a hydrofoil section so that as water flows through the throat region it is accelerated, whereby a decrease in pressure is produced that causes the valve member to flex and move towards the hydrofoil section so as to momentarily interrupt the flow of water, and wherein said flexible valve member is in the form of an elongate strap mounted longitudinally in the throat region of the tube facing said hydrofoil section and lying substantially parallel to the normal flow of water through the tube, said elongate strap being pivotally mounted at one end and fixed at the other end, whereby, in use, a resulting momentary differential of ambient pressure underneath said flexible cleaning member enables the device to move forward along said underwater surface of the pool.