Is there supposed to be an open area in the venturi tube even after placing the air shutter on? Will the propane come back out of the open area?
The air shutter will never completely close. The open area lets oxygen mix with the propane to give you the blue flame that you need. Without the open area for the oxygen, there would be a yellow flame that would smoke up the pot. The propane will not come back out of the venturi tube. It will jet through the tube.
