The "O" ring is held in place by friction alone. That being said, depending upon how much pressure will be built up and if there is lift off, then I would machine a slight recess inside the tube to "snap" the "O" ring in place. I haven't measured the back pressure going through the nozzle, but I can do that a bit later. My little pump can deliver up to 30+ psi when it fully restricted, but personally don't think that the back pressure will be of any significance....but we shall see.
At present, I don't have a resevoir inline, but I do have one that I found in my junk box that I can use if need be. What would be the final effect on the product of a pulsing air assist? I can see if the final ass'y is flimsy, then a pulsating blast of air going through a restriction "could" cause some vibration....but in my case.......nothing moves...
Boiler plate design.
It does take a lot longer to design and build a robust system, but what the heck....its only a hobby...
If I was to do this at a commerical level and put on my engineering hat, I don't think that I would design the system like the far east boys do....cheap and easy, but rather a bit more robust and solid. Its all a matter of cost and what one can afford. Since we are in the throw away and discard society, cheap and easy is the way to go...........not for me!!! I like to build it once and rarely touch it again...but thats just me.....I guess the 30 years spent at IBM is starting to
show
Better resale value as well if you build it solid.
. Well thats my story and I'm sticking to it
Back to the basement for me.
Richard