Anybody use this 400 psi Sigma QEV?

[n05gr0th]

I've been searching the web for a few days, looking for high performance QEVs rated for 350 psi or more with little luck. So far this was the only one I could find that met my requirements:

http://www.sigma-valves.com/pdfs/Quick- ... v-0110.pdf

Anybody buy this valve or even have dealings with sigma? If you have, could you tell me if it was worth it?

Thanks!

[MrCrowley]

You could just use one of the typical UK or US style QEVs. People have taken them over 500PSI before, I believe. I've taken mine to about 400PSI. If it does fail, the likely scenario is the piston/diaphragm failing and opening the valve. Just treat the air cannon as you would a firearm when it's loaded and pressurised and you should be safe.

[n05gr0th]

Really? I'll browse the forum for some tried and tested UK models then, cheers!

One final question. Would it be worth piloting a QEV valve with another QEV valve, which is in turn fired by a hammer valve? I want to make a single shot gun, and want a mechanical trigger that can hide inside the body of the gun, unlike a spring loaded ball valve, but I'm concerned about the flow and opening time of hammer valves.

Many thanks.

[MrCrowley]

I've used a 1/4" QEV to pilot a 3/4" QEV, if you can get them cheap then go for it. I have a blowgun piloting the 1/4" QEV, which is probably overkill for that even. I imagine a hammer valve would work with the 1/4" QEV.

[n05gr0th]

I don't really care about overkill. I just want to squeeze the most possible power out of a QEV valve at 350 psi and a 50 inch barrel (which I understand, in spudding, to be pretty short) - hopefully 100 fpe.

Thanks again for your help.