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Pressure pot for turbine?8/15
I've noticed that there are now small pressure pots designed for turbine units with no compressor needed. I'm interested in one, and was wondering if anyone could comment on how well they work? Intuitively it seems like they would rob the gun of pressure, but I suspect I just don't understand the physics involved.
No atomizing air is used to pressurize the pot so no loss of essisental air to the gun. I have a graco 9000 with the optional mini-compressor...nice compact set-up. But you can use any compressor and pot to feed the material to the gun. The benifets are obvious; with increased material flow production goes up, with no cup you can spray at any angle and spray in tighter areas.
Accuspray has been selling complete units with a 2 liter pot for 20 years. I had one and it has a little micro air pump built into the turbine box. The micro pump provides the 10-30 psi needed to pressurize the pot and the turbine provides the atomizing air.
That system worked well. The seem to have come up with a cheaper system that robs the HVLP pressure to pump up the pot. That doesn't sound like a great idea for atleast two reasons. Obviously you are limiting the atomization because you are using the air for a different purpose. Also HVLP air is about 10psi. That is the absolute minimum pressure required to push the liquid out of the tank. Typically you use 15-18 with a finish designed to be sprayed with no reducer. Thicker finishes like primer and paints need 25-30 psi to get them out of the tank.
Personally I wouldn't waste my time or money with a pot system unless it has its own fluid pressure line. You can use any air compressor like a small framing one or a big one in the shop.
While in Sherwin Williams today l see titan makes a mlnl plston pump that is made to feed help turbine units...l have no idea if it works but see no reason why it wouldn't. It was very compact.
Just wanted to drop a line to say thanks to the people who posted to this thread. I bought a 2 quart pressure pot, an oiless mini compressor, and a pressure feed gun. I'm not sure if it's the pressure pot, the new gun, or a combination, but the difference in performance is night and day. Way better atomization, and way more control. Previously I felt I was always trying desperately to get acceptable results with my gravity gun, and now the results are consistently very good. Even tougher things like the insides of drawer boxes are coming out looking great. My only regret is not getting a larger pressure pot and longer lines.