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What pressure will QEV's fail at?

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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What pressure will QEV's fail at?

Unread postAuthor: whoa044 » Thu Dec 06, 2012 7:31 pm

So we've heard the stories of people using HPA and unregulated CO2 with their QEVs, reaching 800 psi, but has anybody ever had a QEV fail on them? What size was it, and at what pressure did something go wrong at?

I just ordered a McMaster 3/4" QEV that I plan to use at 500 psi. Reading through all the QEV related posts, it seems like I should be good at that pressure.

Pretty much every QEV article I could find, people have been using their valve reliably at whatever pressure they use, be it the rated pressure, 300psi, 500psi, or even higher.

How far are these pressure from the point at which the QEV is being severely damaged?
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Unread postAuthor: Goats spudz » Thu Dec 06, 2012 7:52 pm

The shell won't burst at under 2000 Psi, if taken above 1500 Psi the diaphragm may deform, keep it under 1500 Psi.
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Where's my Chuck key?

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Unread postAuthor: whoa044 » Thu Dec 06, 2012 9:10 pm

Awesome, thanks for the answer
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Unread postAuthor: Zeus » Thu Dec 06, 2012 9:37 pm

Goat, you're talking from your arse a little. My 1/4" European QEV developed a small crack at the pilot side when I reached 950 psi. Nothing dramatic, just a slow leak.
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/sarcasm, /hyperbole
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Unread postAuthor: Goats spudz » Fri Dec 07, 2012 2:47 am

I take it you haven't seen the 100 BAR in a Qev.
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