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Trouble with my piston valve

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Trouble with my piston valve

Unread postAuthor: Northir » Sun Sep 13, 2009 8:02 pm

as some of you know im working on my first piston valve, using MrCrowlys instructiable i have it built, and when i pressureize it it seals my seat, when i release the pilot it all comes out with out releasing the piston thoughts ideas?picture comming

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Last edited by Northir on Sun Sep 13, 2009 8:07 pm, edited 1 time in total.
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Unread postAuthor: potatoflinger » Sun Sep 13, 2009 8:05 pm

Most likely the gap between your piston and the valve housing is too big. The solution would be to make your piston fit tighter in your valve housing or get a bigger pilot valve.
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Unread postAuthor: Technician1002 » Sun Sep 13, 2009 8:16 pm

Often overlooked in PVC is under pressure the pipe has some flex and give. What fit before will change as the pressure is applied. You may want an o ring to fill the enlarging gap. My Mouse Musket exhibited this. Worked fine at lower pressure and sometimes just hissssed and no boom at higher pressure. A little heavier grease fixed it most of the time.
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Unread postAuthor: cannon monkey » Sun Sep 13, 2009 8:19 pm

try o ring or duck tap for now make the fit alot tighter
if that dont work try bigger pilot valve
good luck
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Unread postAuthor: MrCrowley » Sun Sep 13, 2009 8:54 pm

cannon monkey wrote:try o ring or duck tap for now make the fit alot tighter
if that dont work try bigger pilot valve
good luck

He's got a 1" sprinkler valve on there by the looks. If that doesn't do it, the piston is at fault.

Edit:
When are you going to trim your sealing face to the same diameter as the piston?
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Unread postAuthor: Northir » Sun Sep 13, 2009 9:03 pm

>.< lol when i get better at it, that piece of rubber was to thin using something with a little more depth
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Unread postAuthor: MrCrowley » Sun Sep 13, 2009 9:05 pm

Try using superglue to glue it down to the piston
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Unread postAuthor: Northir » Sun Sep 13, 2009 10:29 pm

super glued now, just did a dry fire @ 50 PSI and she works, was loud and wonderful. . . but i now i have a barrel leak, my piston is 2" and my seat OD is 1.9 thoughts? also im using a piece of rubber from an old water tank bladder instead of a bike inner tube, my seat is square i know it is since i used a compound miter saw to cut it, then lightly sanded it with 200 grit sand papper
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Unread postAuthor: MrCrowley » Sun Sep 13, 2009 10:37 pm

$10 says it's leaking out of the bolt and washer on the front of the piston. Epoxy that up, make sure not to get any on the rubber sealing face that would be in contact with your barrel/seat.
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Unread postAuthor: Northir » Sun Sep 13, 2009 10:58 pm

would shoe glue work?
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Unread postAuthor: inonickname » Sun Sep 13, 2009 11:02 pm

Shoe/goop? If it's the stuff I'm thinking of, most likely.
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Unread postAuthor: Northir » Sun Sep 13, 2009 11:20 pm

muhahahaha! it lives! onbly leaks left are in my fittings, and i think im out of Teflon tape
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Unread postAuthor: FORE!!!! » Mon Sep 14, 2009 3:03 am

Northir wrote:muhahahaha! it lives! onbly leaks left are in my fittings, and i think im out of Teflon tape


lol i think we have all been there!!! :D
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I've used various things like cutting oil, silicone lubricant, even butter

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...but hey, lube shows you care;)
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Unread postAuthor: Northir » Mon Sep 14, 2009 3:19 pm

thank you MrCrowly for sharing this amazing cannon with every one, now i believe i have a better understanding of the piston valve and can make my own cannons, of course im broke now lol but thats ok
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Unread postAuthor: cannon monkey » Mon Sep 14, 2009 3:34 pm

i think 65% of the people on this website are broke and if not they are at lowe's lol
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