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pilot valve questions

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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pilot valve questions

Unread postAuthor: c9d » Fri May 14, 2010 10:31 pm

For my project I was going to use a 125 psi safety relief valve as my pilot valve. However after receiving it today, it takes entirely too much force to actuate. I was wondering if anyone had used something like this as their pilot valve:

http://www.grainger.com/Grainger/items/1DDY7?Pid=search

Assuming I block off the line flow of air and just use it to vent to atmosphere, it should work
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Unread postAuthor: Gun Freak » Fri May 14, 2010 10:36 pm

I believe Clide used it on his semi...

Well I never figured out if it was homebuilt or not, but here it is:
http://www.spudfiles.com/forums/semi-auto-t160.html
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Unread postAuthor: jor2daje » Sat May 15, 2010 12:49 am

There have been a couple guns that use these as pilots, but mainly for semi-autos.
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Unread postAuthor: metalmeltr » Sat May 15, 2010 7:42 am

If you were trying to actuate it at atmospheric pressure it wold be harder than at say 100psig.
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Unread postAuthor: c9d » Sat May 15, 2010 10:10 pm

The pressures i would be using would be 75 psi max.
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Unread postAuthor: metalmeltr » Sat May 15, 2010 10:18 pm

The valve will still open rather easily at pressure.
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Unread postAuthor: Gippeto » Sun May 16, 2010 12:06 am

This is the same "type" of valve used to isolate paintball markers from the co2 supply(mounted on the remote line). Paintball markers typically use one of 1/8"npt size, but given the design, operating force shouldn't be noticeably different in the 1/2" one.

Fastenal has them for a bit less too. :)

http://www.fastenal.com/web/products.ex ... tial&Nty=1

IIRC (and I believe I do. :) ) Ragnarok used one to pilot the qev pilot on heal. Seemed to work just fine at the 300 psi or so he was using.
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