Re: Pressure at gauge at the wall

Posted by Rod (NH) on September 30, 2004 at 22:03:27 from (64.140.200.138):

In Reply to: Pressure at gauge at the wall posted by Ray A on September 30, 2004 at 18:21:39:

Hi Ray,

The gage reading back at your wall regulator is not relevant. What matters is the pressure right at the gun inlet with the fan pattern adjustment wide open and the trigger pulled. The correct maximum pressure at the gun inlet for your HVLP gun should be specified in the documentation that came with it or actually stamped or otherwise indicated right on the gun handle. This is a maximum pressure that is specified to comply with the HVLP legal requirement for 10 psig maximum at the air cap. Assuming you are bound by local legal requirements or just wish to comply with HVLP transfer efficiency, you should adhere to the maximum pressure specified by your gun manufacturer. That's what the gun and air cap are designed for. Forget the gage back at your wall regulator. Adjust your wall regulator to get the proper pressure as read on the gage at your gun inlet with the trigger pulled. The gage back at the wall regulator will always read higher but the reading is not important. If you have some additional "regulating" device at your gun inlet, can it and replace it with just a teed-in pressure gage. You don't need a regulator on top of a regulator. There are "fine tuning" methods based on actual atomization results (not pressure readings) but I have never found them to be necessary. I set my HVLP gun to the manufacturer's maximum and go with that. For my non-HVLP gun, I set in the high end of the range recommended by the paint manufacturer.

Rod

Follow Ups:

• Re: Pressure at gauge at the wall CNKS 06:36:33 10/01/04 (0)
• Re: Pressure at gauge at the wall CNKS 06:32:16 10/01/04 (0)
• Re: Pressure at gauge at the wall CNKS 06:32:07 10/01/04 (1)
  • Re: Pressure at gauge at the wall Rod (NH) 10:25:40 10/01/04 (0)

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