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Questions on valves

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Questions on valves

Unread postAuthor: niglch » Sat Feb 16, 2008 9:06 pm

I've been looking around for a blowgun to use with my piston-valve pneumatic rifle. I found one on mcmaster.com (item no. 6852K11) and I'm wondering if it would be ok to use with a 1/4" NPT (7/8" length) steel close nipple (44615K412) to screw it into the pipe.
Also, I found a Schrader valve with 1/8" NPT hardware already installed (8063K41). Could I just install that directly into the PVC using teflon and a ~1/4" hole?
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Unread postAuthor: MrCrowley » Sat Feb 16, 2008 9:15 pm

Yes, yes and yes. Just make sure you don't drill a hole too big.

Edit: Oh and try and tap the schrader valve through two layers of PVC, not one, like a fitting or something.
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Unread postAuthor: sjog » Sat Feb 16, 2008 10:01 pm

Taps may be a little costly but great for confidence , just knowing one part is done safely. Right on the tap the proper drill bit size is stamped .
Right size bit and tap used on PVC will last for ever. Give it to your grand kids!
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Unread postAuthor: Gippeto » Sun Feb 17, 2008 2:55 am

All very good advise.

I will add a drill and tap chart, might be an idea to save it or print it out. Reference materials always come in handy.
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Unread postAuthor: sjog » Sun Feb 17, 2008 5:36 pm

Thanks for that Geppeto
The drill sizes are some times odd , not in simple drill indexes.
So get the exact size and don't lose it.
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Unread postAuthor: dongfang » Sun Feb 17, 2008 6:01 pm

Hi,

Is there something wrong here? 21/32 inches for an 1/8 inch fitting?

I know that the 1/8 inch is not to be taken literally, but that hole would be so large that the whole fitting (I have lots of them so I should know their approx. size) would drop right through it ....

Regards
Soren
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Unread postAuthor: DYI » Sun Feb 17, 2008 6:17 pm

That chart has a severe problem. It shows the hole for 1/8" threads as being larger than the hole for 3/8". :?
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Unread postAuthor: sjog » Sun Feb 17, 2008 6:27 pm

the diff from 1/8 to 1/2 is 2/32
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Unread postAuthor: niglch » Sun Feb 17, 2008 8:37 pm

Do you think he could have meant 21/64? That would be a lot more reasonable.
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Unread postAuthor: jr » Sun Feb 17, 2008 9:15 pm

just read the tap :shock:
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