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inserting fittings in pvc

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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inserting fittings in pvc

Unread postAuthor: thisnobody » Fri Mar 27, 2009 2:58 pm

should i use 1/8"npt which is fine thread or 1/4"npt which is course thread when modifying my sprinkler valve (plastic) and when inserting the schrader valve and pressure gage into the chamber(pvc) ?
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Unread postAuthor: jrrdw » Fri Mar 27, 2009 5:56 pm

Depends on the size fitting your installing. The blow gun for the sprinkler valve is probly 1/4". The schrader is probly 1/8". Look at it and size it up by eye.

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Unread postAuthor: jook13 » Fri Mar 27, 2009 11:56 pm

I think he is asking which will hold better? the fine thread of 1/8 or 1/4 which is a heavier thicker thread...
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Unread postAuthor: thisnobody » Sun Mar 29, 2009 7:30 pm

yes, i can get either fine 1/8 or course 1/4 as far as holding power i was wondering if there was a differnce
i would hate to launch the fittings instead of a projectile
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Unread postAuthor: covey12 » Sun Mar 29, 2009 7:56 pm

thisnobody wrote:yes, i can get either fine 1/8 or course 1/4 as far as holding power i was wondering if there was a differnce
i would hate to launch the fittings instead of a projectile


ive used both, and havent had any problems at all, if your really worried, position the fittings so that they point away from you during firing, but as long as you use some teflon tape you should be fine.
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Unread postAuthor: thisnobody » Mon Mar 30, 2009 3:19 pm

1/4 would probably be better if using teflon tape
the fine threads of 1/8 can easily get stripped in the pvc right
i'll go with the 1/4
thanks for the input
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Unread postAuthor: starman » Mon Mar 30, 2009 5:13 pm

I've done and seen mostly 1/4" nipples or angled bits used for this as it is the more common size. Also, 1/4" will offer nominally 4 times more pilot flow than a 1/8" will.
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