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PVC Union Question

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PVC Union Question

Unread postAuthor: Atlantis » Tue Apr 18, 2006 7:45 pm

Are all PVC unions pressure rated? I found a 2" union at United Hardware for $8.99, it's dark gray. The same Union on http://www.mcmaster.com costs about $20, if this is good for pneumatics I'm going to buy a few. I forgot to check if it had a pressure rating on it.
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Unread postAuthor: beebs111 » Tue Apr 18, 2006 7:49 pm

its proably pvcII(sch80) mine looks like that(dark gray) and it says pvcII on it, so my scientific conclusion is that yes the cheap one is pressure rated
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Unread postAuthor: Atlantis » Tue Apr 18, 2006 8:11 pm

Cool, next time I'm there I'll buy one. I work across the street from their.
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Unread postAuthor: sgort87 » Wed Apr 19, 2006 2:08 am

Buy like, all of em. That's a very good price. I may want you to send one to me. I need one and I am having issues finding a 2" sch 80 union.
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Unread postAuthor: Atlantis » Wed Apr 19, 2006 1:52 pm

I don't really like mailing things. Check if you have a United Hardware by your place. It's a supplier and not a store so things are a lot cheaper, being a supplier also means they're loaded on parts. When I went there, they had boxes full of pipe parts that they didn't have room for.

P.S. What are unions normally for? Are they for filters? Something about screwing 2 pipes together?
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Unread postAuthor: sgort87 » Thu Apr 20, 2006 1:00 am

It's just for connecting two pipes toghether with an air/liquid tight seal, no pipe rotation needed, and allows for a tight fit with no need to pull the pipe away from the other pipe.

Let's say you want a good connection from one spot to another spot exactly 2 feet away and niether connection is able to move at all. Unions allow each joint to connect to the 2 foot bridge pipe at the same time so there's no need for reverse threads or cramming the bridge pipe in to fit.
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Unread postAuthor: Benny » Thu Apr 20, 2006 2:23 am

what! last time i brought a 1 inch sch40 union it cost me $20 oh f*** :evil:
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Unread postAuthor: Atlantis » Thu Apr 20, 2006 3:28 pm

Wow these things must be really cheap. I might check them today after work, I just have to cross the street. i'm gonna use one of these for my first pneumatic. I'm gonna try and use this idea.
http://www.spudfiles.com/forums/viewtopic.php?t=1842&

P.S. Couldn't you use a burst disk for an exhaust? You would get an extremely fast exhaust. Someone should just take like 5 piston valves, have them exhaust in chain reaction. I wonder if that would be cool. Boom, Boom, Boom, Boom, KABOOM! Oy my back!
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Unread postAuthor: boilingleadbath » Thu Apr 20, 2006 6:27 pm

The advantage of a faster opening pilot valveis mainly consistancy, and there should be no percivable inprovment in that from such an exsesive firing chain.
Using a QEV as a trigger is good enough.

As to using a burst disk as an exhaust, if you are going to relinquish control over the time of launch, you might as well just get a 2" union - you'll gain preformance and save money.
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