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Would these parts survive?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Would these parts survive?

Unread postAuthor: skyjive » Fri Nov 26, 2010 11:09 pm

Part 1: McMaster 4753K52
Spring-loaded Piston Check Valve with stainless steel seat, spring, nickel-plated brass body

Part 2: McMaster 48435K72
Pop-off valve

Would these parts be okay if subjected to hybrid combustions of say, 30 psi pre-ignition pressure? I would imagine so but thought I'd get others' opinions on the matter.
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Unread postAuthor: MrCrowley » Sat Nov 27, 2010 1:25 am

So, basically, would they survive a 2x mix? I would think so. Maybe after awhile the seals will fail but it shouldn't be much to worry about.
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Unread postAuthor: omniscient » Sun Nov 28, 2010 1:30 am

30psi pre-igintion pressure is just short of the required total pre-ignition pressure of a 3x mix.

Using a generic 14.7psia and 0.6psi for each injection, a 1x mix has a pre-ignition pressure of 0.6psig --- a 2x mix has a pre-ignition pressure of 15.9psig --- a 3x mix has a pre-igniton pressure of 31.2psig

A 2x mix will generate a peak combustion pressure of approximately 205psig
and a 3x mix will generate a peak combustion pressure of approximately 308psig

If this 4753K52 valve was to be used for a 2x mix, it should survive for a while because the valve is rated for 200psi@, but only at 300°F

The 48435K72 valve can be ordered at a rating as high as 300psi, but the soft seal pop-off is only rated for up to 250°F

In my experience, pop-off valves and check valves are usually fried, after several firings.
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Unread postAuthor: MrCrowley » Sun Nov 28, 2010 1:31 am

Ah yes, my bad. Wasn't thinking straight :D
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