A question, why can't you use threaded fittings? The cam locks are great but if you are only swapping barrels on occasion then just go with threaded fittings.

BTW, what's the chamber and barrel made out of? From you concern about using plastic with pressurized air I assume that means both are ...

topic has drifted a bit covey, since we found the "quick-clamp fittings" - and I'm too lazy to start a new thread!

I'm trying to fit more test equipment than I probably should into the budget, so I'm doing things on the cheap when possible :)

I was under the impression the modified sprinkler valve would work out better (lower PSI for same velocity), but the QEV probably makes more sense from a safety standpoint ...

Um.... Why? There are metal valves rated for air that will out perform a modified sprinkler valve and they're very affordable ($20). If you're truly worried about certifications and such because you're in a professional environment, there is no excuse for using sprinkler valves.

edit: And if we ...

I worked at one time in a pharmaceutical plant and the fittings in your original post are sanitary fittings, they are designed to be taken apart over and over with minimal tools and to maintain they're reliability.

Ah ha, that helped me find them! Quick-clamp fittings... go figure. Cheers!

http ...

Yep, I wouldn't even worry about it if it wasn't in a place of business - the only reason I'm using ASME pressure rated tanks, all metal fittings, etc.

Of course, I'm also using a mod sprinkler valve, but those are air pressure rated, really! :roll:

One more thing while I've got you guys here ...

for fluids and particle solids only it appears - and gas and fluids behave VERY differently under pressure breaches than gas! Leaky pipe vs. exploding pipe...

Man, after 2 days of scouring the catalogs, and I somehow miss those. i need a vacation, ha!

It looks like most aren't rated for compressed air - I assume as long as I get aluminum/brass/steel I really don't have to worry about the thing grenading as long as I stay below the rated pressures? I'd ...

protective eyewear, can't say more than that, sorry!

where can those fittings be found?

I'm making a stationary cannon for product testing (yes, my job involves making pneumatic canons, be jealous).

I'm looking to change out between two different barrels on a relatively regular basis (2.5" and 3"). They'll both be reduced to 1" or 1.5" for the valve piping (I only need 70mph, so I'm ...

Anybody try using flexible plastic tubing (pressure rated to 150psi) instead of PVC? I see it being much safer than PVC (if it explodes, it just ruptures because it's flexible, instead of shattering and sending shards everywhere), plus the smooth curves instead of elbows could help reduce pressure ...

Mostly for failure testing on protective eyewear, some protective padding stuff too (and possibly lacrosse head studies).

Pros can shoot at over 110mph... which is just scary. that's over 140j. The protective standard for Motorcycle crash equipment is only a 50j impact!


EDIT: Also having a real ...

I may give up on breach loading and just go muzzle. Not as elegant, surely, but I'll need to retrieve the ball from the chamber after each shot anyway.

I ran GGDT with the supplied numbers for the 1" sprinkler valve (mod) to get my numbers and speeds - have you guys found this to be inaccurate? It ...

Thanks for the tip. I may use an aluminum pipe instead of PVC for the barrel if I can't find PVC that fits well (mcmaster has a lot of options, but the IDs vary a lot). Aluminum would also make machining of a breach loading system easier too. It would also probably be "safer", although I really ...

I'm new, so if I'm being stupid and missed a thread similar to this elsewhere, just point me in the right direction and call me a noob. (I did look through a quick search and didn't find anything).

Skip down to: "QUESTION:" if you don't want to hear me babble.

I'm building a pneumatic gun for ...