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help with slide/check valves?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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help with slide/check valves?

Unread postAuthor: jmez1996 » Thu Jul 28, 2011 3:24 am

hi again everyone.

i am trying to understand the principles around slide/check valves and how many people implement them into QEV guns as a pilot, as i am thinking about using one for my next gun
however i dont really kno much about them and will be ordering one online.
(maybe this one? http://cgi.ebay.com/New-Paintball-Gun-S ... 3f08799d74)

from what i kno already (i think) a check valve only allows air to flow through it in one direction, like a fill valve.

I dont understand how these are implemented as a pilot for qevs for semi-auto? and how they are operated?

sorry for the noobish question i have just never worked with them before.

any help would be much appreciated :)
thanks again
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 28, 2011 3:38 am

I explained slide valves recently here

It's basically a three way valve that governs your pilot.

"rest position" connects it to the fill line and closes it off from the atmosphere.

"fire position" closes off the fill line and opens the pilot to the atmosphere.

In practice, just connect the fill line to one end and QEV to the other.
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Unread postAuthor: Crna Legija » Thu Jul 28, 2011 3:43 am

you dont need a check valve you need a slide valve sometimes called a sleeve valve. hears a link to one.


Image

the pilot in that drawing is how a slide valve works and how you set it up with a qev
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Unread postAuthor: jmez1996 » Thu Jul 28, 2011 10:20 am

yeh that pretty much explains it, cheers.
also how does this work with semi autos? will it work fine aslong as it has a big enough supply of air going into the slide valve?
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 28, 2011 10:28 am

What you want is a large main chamber attached to the slide valve, and a small "firing chamber" containing just enough air for one shot - say one or two times you barrel volume - attached to the chamber side of your QEV.
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Unread postAuthor: jmez1996 » Thu Jul 28, 2011 10:35 am

rightttttttt... thanks.
recommend any good 1/4" slide valves? a 1/8" is hard coz id have to get an adapter which i would also have to get online..
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 28, 2011 10:43 am

This seams reasonable value for money: http://cgi.ebay.com/Slide-shut-off-Valv ... 1c18e5e48e
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Unread postAuthor: jhalek90 » Thu Jul 28, 2011 1:03 pm

That one is BSP threads though. Which I guess is okay, if you live in that part of the world.
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