My Passache VL started "pulsing" when you pull back on the trigger to paint. I have good airflow that is constant. The brush starts to spray paint in rhythmic burst as you pull the trigger back. The further you pull back, the faster it gets. I have tried another needle and nozzle combo with the same results. I also recleaned the entire gun, but it still pulses. It has worked well unto this point. I have had this brush for about 8 years. Any suggestions? What am I missing here?
I'm no expert here, having used my VL just a few times on water soluble paints.
It would help if you provided more info. What type paint, any dilution? What air pressure to the brush, how controlled? Does it spray pure alcohol ok and only misbehave with the paint?
Paint dilution specifications vary with the paint type. I added some Paint Easy to my paint even if not required, and it did ok at a certain air pressure. Model Master, I believe, at 30-some psi IIRC.
Paul
Modeling HO with a transition era UP bent
I've been using my VL for over 30 years, and haven't experienced such a problem.
Pulling the trigger back only moves the needle, creating a larger opening at the tip, which simply allows a greater volume of paint to be sprayed.
Pulsing is usually attributable to the air supply - does your compressor have an air tank? Perhaps there's water in it which needs to be drained. Also, do you have an in-line oil/water trap, either at the compressor or in the air hose, near the airbrush? These also need to be drained or blown-out periodically.
I use a rotary compressor, which doesn't pulse like a piston or diaphragm-type, so requires no air tank. It does, however, need to run constantly when painting.Wayne
Anthony61,
You don't mention Your air source. If You are using a diaphragm type compressor this is common for those the older they get, the more noticeable it becomes, a tank on the compressor is the best. Also pulsing paint can be related to paint not thinned properly. Dried paint inside tunnel for needle, only letting out small amounts and not sucking paint out properly. You don't mention what You use to clean Your brush......dried Acrylic paint is hard to get off, with just water or alcohol, even mineral spirits. It is always best to clean an airbrush with lacquer thinner and nothing else.....been doing that with all My air brushes and professional guns for over 40 yrs. and never had a problem using lacquer thinner. There are more working parts in a VL brush unlike a H-model so there is more of a chance of dried paint internally. Take a look at the link I will provide and read it about what You are experiencing....should help You:
http://www.craigcentral.com/models/trouble.asp
Take Care!
Frank
Hi Anthony,
I've been using Paasche' VL's for about 3 decades and on one occasion I had the problem you've described. This may or may not be helpful, but as things went.... a few years ago I started metalizing a passenger car shell when my VL started "pulsing". I was perplexed since my air supply was steady, airbrush tunnel, needle, and air cap were very clean. I spent 10 minutes checking things over and over. I even turned the pressure up and down but it continued pulsing!
Then I decided to take the wrench that came with the kit and tighten the air cap body, snuggly. I tested the airbrush and "VOILA!"....all pusling stopped and my smile returned! Although the body appeared tight, apparently a tiny amount of air was escaping at that junction.
"I like my Pullman Standards & Budds in Stainless Steel flavors, thank you!"
never used the vl i still use a g but never had that problem with it. but i did have a pulsing problem with auto gun and traced it down to a loose liner in air hose .
AntonioFP45I've been using Paasche' VL's for about 3 decades and on one occasion I had the problem you've described. This may or may not be helpful, but as things went.... a few years ago I started metalizing a passenger car shell when my VL started "pulsing". I was perplexed since my air supply was steady, airbrush tunnel, needle, and air cap were very clean. I spent 10 minutes checking things over and over. I even turned the pressure up and down but it continued pulsing!
Antonio, great advice. I don't recall the symptom I experienced but something strange on my first trys. I tightened the cap with the supplied wrench (which did the trick) and have done so ever since. On mine, hand tight does not quite suffice.
Hi,
OK, I might as well answer a quick question regarding the Paasche' in the photo instead of posting a new thread.
The stripes on my airbrush are not from the factory. It's just a scrap piece of an automotive pin strip that I have in my workbench stash. I have two VL's that I use regularly. One is dedicated for metalizing only while the other I use for colors. The color unit is striped.
Although I have other airbrushes , I keep returning to my VL's over and over. To me they're my "EMD GP-38-2's"...tough, reliable, and versatile.
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