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Re: HVLP gun

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Rod (NH)

01-31-2012 11:23:47

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I'll add that if your gun has an internal strainer in the recess where the cup attaches, take it out and leave it out. Those internal strainers tend to restrict flow to the gun nozzle and are more of a PITA than a help. They're not necessary if you strain your paint when filling the cup using the cone strainers you get free from your paint jobber, as you should be doing anyway.

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02-02-2012 06:05:41

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 Re: HVLP gun in reply to Rod (NH), 01-31-2012 11:23:47  
I have always wondered if the internal strainers restrict flow. I filter my paint in the cone strainer before I put it in the gun. Does everyone remove those internal strainers also?

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Rod (NH)

02-02-2012 10:14:29

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 Re: HVLP gun in reply to jfred, 02-02-2012 06:05:41  
My personal experience is yes, they do restrict flow, even when they are perfectly clean. I don't know if current high-end guns have such older DeVilbiss guns do not. I purchased an inexpensive gravity feed hvlp gun from Home Depot to spray some POR15 as I was nervous about putting that stuff through my DeVilbiss. On first use I noticed a paint flow significantly less than what I expected. It seemed like the gun was being starved of paint. Upon investigation, I found the gun had an internal strainer in the cavity where the cup screws on. I was surprised to find it as my other gravity guns did not have such a part. I removed it and the gun then sprayed much better. Here's what it looks like after removal:

Notice the "snout" to the right of the screen area. That snout protrudes through a circular opening in the gun recess that is not much bigger in diameter than the spherical bulb at the end of the snout. That fact alone, creates an annular area for paint to flow through that is significantly less than the full circular area of that opening. While that snout may be a way of metering maximum flow to the tip to keep it within the capacity of the air cap to atomize properly, I had no problems with atomization without that strainer in place and using the recommended maximum air pressure of 40 psig stamped on the gun handle. In my opinion, the gun works a LOT better without that strainer, plus it's one less thing to bother with during gun cleaning. Use of the cone filters when filling the cup in the first place eliminates any need for an in-gun strainer. I don't know what others do but I leave that internal strainer out.

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02-02-2012 17:47:53

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 Re: HVLP gun in reply to Rod (NH), 02-02-2012 10:14:29  
I have Sharpe and Sata full size guns with the strainers, same brands touch up guns without (they would have to be much smaller). I replace them occasionally, have not noticed them plugged or restricting flow. Something to think about though.

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