At the bottom of the Venturi suction cup, there is a larger opening that is covered with a flexible, rubber-like material. When the suction cup is pressed against a surface and the air is evacuated from the inside of the cup, the pressure in the Venturi channel drops, creating a vacuum inside the cup.
The faster the air flows through the Venturi channel, the stronger the vacuum that is created inside the suction cup.
So far this has been a great end of arm tool for beginners trying to do pick and place operations as they dont have to line things up as precisely as one with gripping jaws. I did have to create a custom mounting plate for this to attach to the ZA6. If anyone would like it I’d be happy to share the files.