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Will This Work?

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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Re: Will This Work?

Unread postAuthor: Andrew_J » Wed Nov 20, 2013 4:29 am

Cant you turn the slide valve around the other way?
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Re: Will This Work?

Unread postAuthor: jackssmirkingrevenge » Wed Nov 20, 2013 6:40 am

oneocim wrote:I don't know if there is other type of slide valve but with the common available one with that design you will be pushing the trigger than pull it. You should move the valve near the qev to have forward direction, except you want to add more mechanical to the trigger.


Nope.

edit: Yep.
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Last edited by jackssmirkingrevenge on Wed Nov 20, 2013 11:10 am, edited 1 time in total.
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Re: Will This Work?

Unread postAuthor: Ragnarok » Wed Nov 20, 2013 9:02 am

johnnyssparklyradish wrote:Nope.

Nope to your nope. The design as Andrew_J has it has the sleeve valve mounted back to front (either that or every time it's pulled, it'll vent the entire air supply tank rather than fire. (And in answer to Andrew_J's question, no, they can only be correctly mounted one way around).

However, moving it up and around the U-joint would let it be mounted the right way around so that pulling it (rather than pushing it) would vent the pilot.
Also, that'd reduce the pilot volume.
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Does that thing kinda look like a big cat to you?
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Re: Will This Work?

Unread postAuthor: oneocim » Wed Nov 20, 2013 10:50 am

Sorry jack, the one that I mean will have to push the trigger is andrew's design not the one you have.
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honey,.. for my next birthday, a lot of epoxy will be enough as the present
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Re: Will This Work?

Unread postAuthor: oneocim » Wed Nov 20, 2013 10:51 am

Sorry jack, the one that I mean will have to push the trigger is andrew's design not the one you have.
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honey,.. for my next birthday, a lot of epoxy will be enough as the present
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Re: Will This Work?

Unread postAuthor: jackssmirkingrevenge » Wed Nov 20, 2013 11:07 am

Wankakok wrote:Nope to your nope. The design as Andrew_J has it has the sleeve valve mounted back to front (either that or every time it's pulled, it'll vent the entire air supply tank rather than fire. (And in answer to Andrew_J's question, no, they can only be correctly mounted one way around).


Quite right, mea cupla :oops:
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Re: Will This Work?

Unread postAuthor: Brian the brain » Wed Nov 20, 2013 4:01 pm

Don't listen to the newbies... :D

You can orientate the slidevalve the other way...if you approach it differently.

Modify your QEV ( tiny equalisation hole and spring) and it will stay closed while pressure comes in from the chamber ( reservoir) side rather than the factory version wich will only accept pilot-side filling.

Put the slidevalve on the pilotside, in reverse, but cap off the other end.

When you slide the valve now, pressure drops in the pilot area and fills the slidevalve and capped off end.
It will pilot the QEV ...and the QEV will reseal as pressure equalises.

Then, slide the slide of the slidevalve ( :D ) back and the stored pressure is released.

The volume in the slidevalve and cap is now ready to be repressurised from the pilot area again.

This method also means you're not dumping all the pressure from the reservoir even after the projectile has left the barrel.

Ideally, the "capped"volume would be adjustable to where shotpower is maximised while waste is minimalised.
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Can't ask for a better compliment!!
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Re: Will This Work?

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Re: Will This Work?

Unread postAuthor: Andrew_J » Fri Nov 22, 2013 5:27 pm

Hey,
I was just wondering if you could send me a basic diagram of the mechanism you were talking about

Thanks,
Andrew_J
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Re: Will This Work?

Unread postAuthor: Andrew_J » Mon Jan 27, 2014 11:56 pm

Could you use something like this for an air pressure regulator?
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Attachments
Homemade Regulator.png
Homemade Regulator.png (13.26 KiB) Viewed 389 times

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Re: Will This Work?

Unread postAuthor: Ragnarok » Tue Jan 28, 2014 11:14 pm

No. To regulate pressure, the spring needs to be opposed by downstream rather than upstream pressure.

This is an animation I did some years ago to demonstrate the basic principle:

Image
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Re: Will This Work?

Unread postAuthor: Andrew_J » Fri Jan 31, 2014 10:51 pm

So you tighten the spring for higher pressure?
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Re: Will This Work?

Unread postAuthor: jackssmirkingrevenge » Sat Feb 01, 2014 7:47 am

Andrew_J wrote:So you tighten the spring for higher pressure?


That's how most regulators function.
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