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Union Mods for Burst Disk

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Union Mods for Burst Disk

Unread postAuthor: PeteS » Thu Jan 23, 2014 4:20 pm

I started with a standard 1-1/2" union from Home Depot. It looked basically like this:
Image

I then chucked the pieces up in my lathe and ground the tapered faces flat. It could be done with a belt sander, grinder, or even files if you have the patience. The modified product looks like this:
Image

Next comes a gasket. It goes on the side toward the chamber. I cut it with a scissors, so there was some excess both inside and outside, and contact cemented it to the union. Then I ground the excess off with a dremel tool drum sander attachment. The rubber is 1/16" stuff from Lowes, found in the plumbing section. The result looked like this:
Image
Sorry that is a little out of focus, but you should get the idea.

Initial tests seem to indicate that this modified union works well.

I hope that is helpful to someone.
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My wife upon seeing my latest hybrid and hearing an explanation of it:
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Re: Union Mods for Burst Disk

Unread postAuthor: noname » Fri Jan 24, 2014 9:36 pm

My union isn't nearly as angular as yours is, for whatever reason. The chamber side is mostly flat, and the angled part of the barrel side extends maybe 1/16" into the chamber side's angled face.
Seeing how well your mods turned out makes me wish I had a lathe... Maybe this summer I'll turn one side of my bench grinder into one. I could also try using my bench grinder but getting it flat would be a chore.
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Re: Union Mods for Burst Disk

Unread postAuthor: PeteS » Sat Jan 25, 2014 5:30 am

noname wrote:My union isn't nearly as angular as yours is, for whatever reason. The chamber side is mostly flat, and the angled part of the barrel side extends maybe 1/16" into the chamber side's angled face.
Seeing how well your mods turned out makes me wish I had a lathe... Maybe this summer I'll turn one side of my bench grinder into one. I could also try using my bench grinder but getting it flat would be a chore.

If you had access to a belt sander the flat surface might make finishing up the job easier. Interesting how different your union is. It looks like it has a lot of flat on the concave side and none on the convex one.
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My wife upon seeing my latest hybrid and hearing an explanation of it:
"That really isn't a potato cannon anymore, is it?"
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Re: Union Mods for Burst Disk

Unread postAuthor: noname » Fri Aug 08, 2014 6:57 pm

This should be good to go! I'll be able to test fire in a couple weeks when I go back to school.
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