I have two Paasche VL airbrushes, one I have been using for years without any issues, the second was inherited and as I don't know its full history I have given it a complete o/haul. This covered doing a full strip down complete clean and replacing the air valve plunger, springs and o-rings. Both before the o/haul and after, the airbrush is suffering from the same issue, when the air trigger is depressed approximately half way you get full airflow, further pressing of the trigger the airflow reduces to about half or less. I am at a loss to know what the issue is. My original VL airbrush doesn't have this problem, with this one fully depressing the air trigger gives full airflow. I'm running them off a standard storage tank compressor with the pressure reduced to 30psi. Any help would be greatly appreciated.
Paasche VL airbrush problem
Posted 09 February 2018 - 06:21 PM
Edited by Fred Jack, 09 February 2018 - 06:31 PM.
Posted 09 February 2018 - 10:49 PM
I recommend revisiting the two areas that impact air control and I am assuming the brush air flow does not drop off because of a leak some where (wipe with soapy water, look for bubbles) First pull up the brush diagram available on the Paache web site.
Remove the air valve assembly (21) from the valve casing (22). No offense meant but confirm that all the parts are correct and they come out in the correct order. The O-ring is flexible, perfect surface and no deformity and the correct size. Then look up into the valve casing and make sure that it is clean. Clean it out all the way up not the brush. Next look at the surface inside casing where the o-ring rides. This must be smooth and look factory good. If the previous owner cleaned it with a wire brush and a heavy hand the air will leak out around the o-ring as it travels or move/deform and block the air. The same will happen if the channel is very dirty. Send the brush back to the mfr for repair of the valve casing if the valve casing is bad.
The next area is the packing nut. Nothing to loose if you pull that and confirm the same things I mentioned above. Reinstall per the mfr instructions including backing the nut out 1/2 turn from a stugg fit.
Posted 10 February 2018 - 12:16 AM
Many thanks to the suggested remedies, re swapping parts out from the operating airbrush to the problem airbrush, yes I had a go at that and the issue remained. In answer to Rick Griewski's suggestions, a thorough check for leaks was done and no sign of any, the air valve parts are all correct and installed in the correct order (no offense taken at all Rick, in fact it is a logical troubleshooting process), the casing is totally clear and smooth and free of any visible defects, a new o-ring has been installed and the whole unit reassembled as per the Paasche diagram. My next step is to try replacing the "old" air valve assembly with the "new" modified air valve, will see how that goes when the new air valve assembly arrives.
Try this: remove the hose and unscrew the air valve screw(26) a bit.
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Posted 13 February 2018 - 04:47 AM
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