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Pvcmaster's new barrel sealer!

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Pvcmaster's new barrel sealer!

Unread postAuthor: pvcmaster » Sun Aug 19, 2007 1:28 pm

My new barrel sealing piston valve! Housed completely in a 2" tee, with 1.5" porting.

Piston:
1 1/4" Sch 40 endcap
2- 2" neoprene washers
1" washer
1/4" bolt
Filled with expanding foam (layer of hot glue on top)

Pilot:
~ 4 cubic inches of pilot volume
3/4" QEV
1/4" blowgun valve

Silicone grease was used to seal the piston to the barrel, 100% silicone was used to seal the back cap on. Bumper is a 2 1/4" x 3/4" neoprene washer.

I just tested it this morning, and it is perfectly airtight, and very, very loud! The small chamber in the picture is just a test chamber, expect to see something better in the future. Questions? Comments?
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Unread postAuthor: spud yeti » Sun Aug 19, 2007 1:33 pm

Questions?
Why does the heading of the picture say june07?
Comments?
Looks beautiful. It really looks good and clean/well built. Well done.
I am looking foward to seeing it fully complete and with a nice sprayjob :D
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really good quote/phrase here
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Unread postAuthor: pvcmaster » Sun Aug 19, 2007 1:37 pm

I have no idea why it says june 07. Blame technology.

I was planning to maybe paint the valve black, and leave the rest of the cannon white, or vice versa.
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Unread postAuthor: spud yeti » Sun Aug 19, 2007 1:50 pm

hmmm yes, a strange thing, technology.

I like the sound of that, I think it will look good either way, although Im more pushed towards white valve and the rest black; but with white trims.
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Unread postAuthor: potatoflinger » Sun Aug 19, 2007 2:28 pm

That looks great, it will look even better with an enormous chamber though :D
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Unread postAuthor: noob of noobs » Sun Aug 19, 2007 3:34 pm

Looks good! Can't wait to see it in action! (Why can everyone build a piston valve but me?!?!?! :evil: )
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Unread postAuthor: origin unknown » Sun Aug 19, 2007 6:25 pm

Very nice. I need to redesign my valve to be more like yours, cause mine has excessive piston travel...
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Unread postAuthor: pvcmaster » Sun Aug 19, 2007 6:34 pm

Thank you for all the compliments. Origin, I spent many hours sifting through most of Spudfiles, only to find your How-To after I had finished the valve, which ironically was the exact same design as mine(with a different piston design of course)

However, my back cap seems to be leaking around the screws despite the silicone sealant, I will have to look for the gasket you told me about in one of your valve post.
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Unread postAuthor: origin unknown » Sun Aug 19, 2007 6:52 pm

Your gasket is the same as mine, you just need to make a new back cap that squishes the gasket more when the srews are in. You have less piston travel, and probably a better fitting piston than mine does which makes opening time alot better. I think I will build a new valve...
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Unread postAuthor: noob of noobs » Mon Aug 20, 2007 8:15 am

Did you just put the screws into the back cap, or do you need some type of gasket material to make them airtight? I'm building a valve similar to yours, but I think I drilled too large pilot holes :evil:
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Unread postAuthor: spud yeti » Mon Aug 20, 2007 8:18 am

Did you just put the screws into the back cap, or do you need some type of gasket material to make them airtight?

A gasket or O-ring is needed to make it airtight

I think I drilled too large pilot holes

Pilot holes? What part is this for?
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Unread postAuthor: noob of noobs » Tue Aug 21, 2007 6:03 am

spud yeti wrote:
Did you just put the screws into the back cap, or do you need some type of gasket material to make them airtight?

A gasket or O-ring is needed to make it airtight

I think I drilled too large pilot holes

Pilot holes? What part is this for?


The pilot holes I think are the holes drilled into the T before hand that you put the screws into later.
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Unread postAuthor: pvcmaster » Wed Aug 22, 2007 11:02 am

Yes, I used a neoprene washer to seal the back cap, along with silicone sealant, and the pilot holes for the screws should be small enough that it takes some effort to screw them in, and they leave grooves in the pvc.
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Unread postAuthor: noob of noobs » Wed Aug 22, 2007 10:44 pm

pvcmaster wrote:Yes, I used a neoprene washer to seal the back cap, along with silicone sealant, and the pilot holes for the screws should be small enough that it takes some effort to screw them in, and they leave grooves in the pvc.


Oh... That's a setback... :cry: I think I'm gonna try to make a metal piston valve though instead of PVC, just since it should be easier to service (and assemble :roll: )
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Unread postAuthor: spud yeti » Thu Aug 23, 2007 11:26 am

noob of noobs wrote:
spud yeti wrote:
Did you just put the screws into the back cap, or do you need some type of gasket material to make them airtight?

A gasket or O-ring is needed to make it airtight

I think I drilled too large pilot holes

Pilot holes? What part is this for?


The pilot holes I think are the holes drilled into the T before hand that you put the screws into later.

Oh OK, sorry, I thought yoiu were talking about some weird way to pilot the piston or something, so I was just curious. Misunderstanding. Sorry.
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