Piston airless sprayers: what constitutes a "short cycle"? - Paint Talk - Professional Painting Contractors Forum
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Old 09-08-2019, 12:28 PM   #1
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What constitutes a short cycle? Pump cycles every 30 seconds or less when sitting idle or once every 5 to 10 minutes?


My logic says a closed system shouldn't lose any pressure. However I know real life and real things allow for less than ideal conditions.

Trying to gauge when it's time to repack?

For what it's worth the piston cup shows zero signs of paint leakage.

This test was done with water. I would think viscosity shouldn't play a role.

Edit: I suppose the upper packing may not be the culprit all the time. Could be either ball, seat or the lower packing.

If the lower packing is leaking, besides the inability to build and maintain pressure or reduced pumping ability while spraying is there a good way to tell?

Last edited by sayn3ver; 09-08-2019 at 12:31 PM..
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Old 09-08-2019, 05:59 PM   #2
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Viscosity does play a role, as thicker paints will help seal the pressure, but even with water, every 30 seconds is not good. Every 5-10 minutes or so is more normal.

The only way to check is to take it apart and clean your check balls and seats. If it still does it, repack the sucker. It doesnt matter what packing or check ball is doing it, you replace the whole setup.

If it still wont hold pressure after a repack, its probably the primer valve.
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Old 09-08-2019, 06:55 PM   #3
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With water loaded at max pressure it'll do a single stroke every 5-10 minutes just sitting there.

Just trying to decide whether to order a repack kit.
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Old 09-08-2019, 11:23 PM   #4
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Quote:
Originally Posted by sayn3ver View Post
With water loaded at max pressure it'll do a single stroke every 5-10 minutes just sitting there.

Just trying to decide whether to order a repack kit.

That's normal with just water, I wouldn't bother repacking it until it won't hold pressure with paint in the line.
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Old 09-10-2019, 01:20 PM   #5
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Thanks for the insight. I was hoping for a response like that.
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