Blowgun max pressures

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shwoseph
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Sat Nov 19, 2022 9:33 pm

I recently bought a basic kobalt blowgun to use in conjunction with a modified 1” sprinkler valve in the usual setup.

The thing is, the blowgun has a warning: “90 psi max”. So, I’m very concerned with safety and I’m trying to understand what this means for me. I don’t know much about blowguns, but it seems like the 90 psi warning is about the output of the blowgun, which I don’t think I need to worry about. I think the value I care about is the max input pressure it can handle without the valve blowing.

According to the QA with a kobalt team member, “There is no maximum input pressure”. I find this hard to believe. Here’s a link to the page: https://www.lowes.com/pd/Kobalt-Standar ... un/3418162

Could anybody who knows more about this fill me in?
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jrrdw
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Sun Nov 20, 2022 6:41 am

I've worked in automotive and lawnmower repair shops since 14 years old, 55 now. I know that well made blow guns like what you posted will handle 150 to 175 PSI on a hot day for years until the valve or the o-ring in the valve wears out. As for a maximum input I'm sure in will vary depending on the batch of metal it's made from. If you look at the documentation that comes with the packaging it comes in, any that I've looked at all say 90 PSI. It's the industry standard for most all hand held air tools.
shwoseph
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Tue Nov 22, 2022 2:02 pm

Thanks for the answer. Just to make sure I have this right: that 90 psi warning is just telling me not to blast air out at more than 90 psi? The input pressure could be much higher as long as I have a nozzle or something that keeps the output below 90?
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jrrdw
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Wed Nov 23, 2022 5:35 am

No, it means 90 PSI is the max input.
shwoseph
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Wed Nov 23, 2022 11:00 am

Thanks for clarifying, jrrdw. I hope I’m not annoying you with too many follow up questions, but you seem to really know what you’re talking about.

Do you have any idea why the manufacturer’s rep says it has no max input pressure? Is he just misinformed? He did get 3 downvotes for that answer.

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