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quick release question

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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quick release question

Unread postAuthor: A-98 » Tue Jan 16, 2007 9:24 pm

hey, i have heard that qev's are very sensitive to drops in pressure from shrader valves when diconnected after filling, and i was just wondering if a quick disconnect has that problem? if it does then i would need to install some sort of check valve, and does anyone have a link to some small, compact one?

EDIT: relised that it was a quick disconnect, not release. *duh*
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Unread postAuthor: Pete Zaria » Wed Jan 17, 2007 3:20 am

I don't know about the pressure drop generated from disconnecting a quick disconnect hose fitting, however, putting a ball valve between your valve/chamber and fill fitting (rather schrader or quick connect) will solve the problem. Simply turn the valve off before disconnecting the hose. In many cases, the same valve can be used for piloting the gun.

Hope that was kind of helpful.

Peace,
Pete Zaria.
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Unread postAuthor: A-98 » Wed Jan 17, 2007 6:36 pm

ya, im going on the safe side and using a check valve, and plus i havent seen anything about not needing one.

also, i would usually use a ball valve, but i want my gun to be as clean as possible, no levers sticking out for me. :D
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Unread postAuthor: Hotwired » Wed Jan 17, 2007 6:54 pm

I've recently had the problem of both a presta and schrader valve messing with the QEV.

A ball valve locked before detaching the pump connector head or a check valve both worked perfectly to fix it.
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Unread postAuthor: sjog » Sat Jan 20, 2007 7:08 pm

Just got QEV heard about sensitivity issues. I've bench tested this setup.
Not finished yet.Image
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Last edited by sjog on Sat Jan 20, 2007 11:00 pm, edited 1 time in total.

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Unread postAuthor: MrCrowley » Sat Jan 20, 2007 7:26 pm

This is my new cannon, you should use a filling station like mine....
quick connect - ball valve - brass nipple - chamber
heres the topic: http://www.spudfiles.com/forums/viewtop ... 422&#56422
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Unread postAuthor: A-98 » Sun Jan 21, 2007 2:39 pm

i think im going to go with an inline check valve...i dont really want to have to deal with the ball valve.

your lucky crowley. i visited NZ over the x-mas vacation, one of the nicest countries ive been to, very clean.
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Unread postAuthor: MrCrowley » Sun Jan 21, 2007 4:21 pm

Thanks :P Didn't realise people visited NZ :wink:
Where you go in NZ? Hope you didn't buy anything spudgun wise here, its bloody expensive :lol:
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Unread postAuthor: A-98 » Sun Jan 21, 2007 7:17 pm

i mostly did the south island (went with my dad), we rented a campervan in christ church and then went from there to franz joseph(sp?) glacier...then we went up the coast and into..uhhh...whitianga ( too many maori names for me..never could get em strait) we then went to picton and took the bluebridge across into wellington and then drove to lake taupo and fished the big river near there... then went to Rotorua and then finally into Auckland. the south island was very quiet driving and all in all i loved the country ( total time was about 3 weeks, not enough tho)
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Unread postAuthor: MrCrowley » Sun Jan 21, 2007 7:56 pm

Yeah the bloody maori names, they keep changing the modern names to maori names coz too many maoris got in parliament :wink:

I live in Auckland myself, but only been to the south island once.
Once you've done enough driving in NZ the country side gets to you....it makes you go crazy :wink: joking.

See any hobbits :wink:
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Unread postAuthor: A-98 » Sun Jan 21, 2007 8:38 pm

lol, no hobbits. but i did read the books.

ya, the only thing that we were glad to be away from was the maori names.

you ever gone zorbing? :D
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Unread postAuthor: MrCrowley » Sun Jan 21, 2007 8:48 pm

No, Im ashamed of myself :wink: , it was invented here and i havnt gone, looks fun as though.
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Unread postAuthor: A-98 » Sun Jan 21, 2007 8:52 pm

its awesome, i went in rotorua. i also did a bungy jump and a freefall thing. really cool
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