How to Seal the Back of a Piston Valve
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judgment_arms
- Sergeant 3
- Posts: 1272
- Joined: Tue Oct 17, 2006 8:49 pm
- Location: Not so beautiful North Carolina, but at least it’s the U.S.A.!
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...
Would this process work on a coaxial? Logic would say yes, but...
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.
"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.
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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pyromanic13
- Corporal 5
- Posts: 913
- Joined: Wed Oct 19, 2005 7:54 pm
do you have access to a lathe?
Movie dialogue: "The good die first."
Tom: "But most of us are morally ambiguous, which explains our random dying
patterns."
Tom: "But most of us are morally ambiguous, which explains our random dying
patterns."
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.
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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MrCrowley
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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.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.
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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PVC Arsenal 17
- Staff Sergeant 3
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- Location: United States
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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The Haymaker
- Private 4
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How about quit playing with plastic, and just move on to steel? Gaskets and 1/4" bolts baby!!!!!!!
http://www.xr650r.us/cannon/closeups/st ... 20beta.wmv
http://www.xr650r.us/cannon/closeups/steel/BT2.wmv
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http://www.xr650r.us/cannon/closeups/st ... 20beta.wmv
http://www.xr650r.us/cannon/closeups/steel/BT2.wmv
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