pilot valve questions

[c9d]

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

[Gun Freak]

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

[jor2daje]

There have been a couple guns that use these as pilots, but mainly for semi-autos.

[metalmeltr]

If you were trying to actuate it at atmospheric pressure it wold be harder than at say 100psig.

[c9d]

The pressures i would be using would be 75 psi max.

[metalmeltr]

The valve will still open rather easily at pressure.

[Gippeto]

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.