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How to Seal the Back of a 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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How to Seal the Back of a Piston Valve

Unread postAuthor: Bluetooth » Wed Nov 22, 2006 6:03 pm

I've seen on most piston valves like Gorts Mauler and Joels Supah they put screws in the tee and endcap to hold it in, but with just screws would that seal or do you need some kind of rubber gasket or o-rings?
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Unread postAuthor: jrrdw » Wed Nov 22, 2006 6:05 pm

Yea, i remember gort saying he has a o-ring in the back of his.
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Unread postAuthor: MrCrowley » Wed Nov 22, 2006 6:10 pm

teflon tape the screws,make sure theyre a tight fit
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Unread postAuthor: Bluetooth » Wed Nov 22, 2006 6:14 pm

How would teflon taping the screws help. there is still space between the screws
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Unread postAuthor: judgment_arms » Wed Nov 22, 2006 6:50 pm

O-ring and Teflon…wait the O-ring should be enough…I think…oh screw it just do both! Hey I’d like to introduce you to a new concept, it’s called: logic!
Would this process work on a coaxial? Logic would say yes, but...
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Unread postAuthor: nicholai » Wed Nov 22, 2006 7:04 pm

the screws dont necessarily seal the tee off, its the tightness of the o-ring(s). The screws just hold the plug in the tee.
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Unread postAuthor: CS » Wed Nov 22, 2006 7:59 pm

"teflon tape the screws,make sure theyre a tight fit" ~MrCrowley

Seriously, this is getting annoying. If you dont even have the foggiest as to what your talking about, you dont need to post! Yeah itll result in a lower post count, but your wasting are time.

Ive actually been playing around with T config piston valves. Im putting roughly a 5% squeeze on the sliding O-ring seal on the piston, and a ~10-15% squeeze on the 'caps' O-ring. The seal for the cap is greater simply since its a non-sliding component, and so its only function is to retain air pressure.

Simply the screws to hold this cap in place are placed on the side that the O-ring doesnt expereince pressure. No teflon. Good question I might add.
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Unread postAuthor: Bluetooth » Wed Nov 22, 2006 8:02 pm

Thanks for your help. Do i just use a hacksaw for the o-rings and how many o-rings do i need?
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Unread postAuthor: pyromanic13 » Wed Nov 22, 2006 8:08 pm

do you have access to a lathe?
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Unread postAuthor: Infernal2 » Wed Nov 22, 2006 11:11 pm

Hacksawing o-ring grooves is a pain in the ass. It can be accomplished but damn, prepare for blisters. You can attempt this on a drill press or drill clamp but both can be tedious as well. Alternatively a lathe is still your best bet.

Teflon tape can be used to seal a drilled endcap but it must be on point further into the gun body than the screws.
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Unread postAuthor: MrCrowley » Wed Nov 22, 2006 11:37 pm

pimpmann22 wrote:"teflon tape the screws,make sure theyre a tight fit" ~MrCrowley

Seriously, this is getting annoying. If you dont even have the foggiest as to what your talking about, you dont need to post! Yeah itll result in a lower post count, but your wasting are time.


On my "Dam Buster" I used screws to old the end cap on so its serviceable and then i later glued on some neoprene foam around it as well which didn't glue the end cap on it just sealed the gap and I had NO leaks whats so ever.Even if you put an O-ring on the back it still leaks through the screws trust me ive tried it. I don't know if gort did it they way I built mine as he won't say exactly how he built his but the way I did, I needed teflon on the screws and the foam around the end cap-tee gap.

EDIT:OK I just looked at the mauler again and realise what you mean. Mine and a few other piston valves don't use "plugs" but "end caps" that go on the outside(or if you sleeve pipe in the inside they screw onto that) Gorts one has a plug which goes on the inside and now I see why you don't need to teflon the screws as they just hold the plug, The other valves im refering too the screws hold pressure as the plug is on the outside....
Like a good example is the "Americannon" only that uses a threaded end cap instead of screws.Just got mixed up with the way gort made his and the way i made mine. So calm down pimp it was a misunderstanding.
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Unread postAuthor: c19o » Mon Dec 25, 2006 9:21 pm

can i just use a screw on plug instead of the plug w/ screws?

edit: and how will i put my sprinkler valve on the screwon plug if its not as thick as a plug like joels or morts
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Unread postAuthor: PVC Arsenal 17 » Tue Dec 26, 2006 7:45 pm

Get a threaded bushing that take you down to the sprinkler's thread size. Or keep the plug and tap it with the size threads you need. If you don't think it's thik enough, get a sch 80 one.
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Unread postAuthor: The Haymaker » Fri Dec 29, 2006 10:32 pm

How about quit playing with plastic, and just move on to steel? Gaskets and 1/4" bolts baby!!!!!!!

http://www.xr650r.us/cannon/closeups/steel%20cannon%20beta.wmv

http://www.xr650r.us/cannon/closeups/steel/BT2.wmv

E
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Unread postAuthor: Bluetooth » Fri Dec 29, 2006 10:41 pm

What are the links?
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