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home made slide check valve for piloting

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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home made slide check valve for piloting

Unread postAuthor: trollhameran » Sun Aug 17, 2008 9:04 am

After reading a thread about using a slide check valve for a pilot, I decided to have a go at building my own from scratch.

Its not completely finished, but so far it has turned out very well. It seals perfectly, and the air vents out very quickly.

The only problem I want to fix is, at the moment the slide doesn't move back into position as easily as I would like.

It is perfect for a single shot gun, but I am planning on using it for an auto loading rifle so it needs to close as fast as it opens, for efficiency. so I am going to experiment with springs to try and get it to close quickly.

The final thing I am going to do to it is weld a piece of metal in the shape of a trigger onto the slide, so that the slide can be operated by your finger, like a trigger from a real gun.

[img][img]http://i256.photobucket.com/albums/hh172/trollhameran/17082008751.jpg[/img][/img]

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Unread postAuthor: daberno123 » Sun Aug 17, 2008 9:47 am

It definitely has potential, but I can see how you have to pull pretty hard to open it.

How many holes are there and how big are they?
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Unread postAuthor: Gippeto » Sun Aug 17, 2008 9:50 am

Excellent work!! You got that together very quickly.

Works great too. :)

Did you use four 4mm holes as planned?

What size is the copper tube you are using?
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Unread postAuthor: trollhameran » Sun Aug 17, 2008 10:00 am

Thanks :)

Once it has a proper trigger on it, it wont be any harder than an air rifle trigger to pull, it was quite hard to do it in the video, mainly because I put to much grease on the inside and it went all over everything :oops:

Yeah there are four 4mm holes in a single line around the pipe.

Its 15mm pipe,and the slide is made of 22mm as that fits nicely over the 15mm when the o rings are in place.

I will take a picture of what it looks like underneath the slide in a minute or two
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Unread postAuthor: trollhameran » Sun Aug 17, 2008 10:08 am

[img][img]http://i256.photobucket.com/albums/hh172/trollhameran/17082008753.jpg[/img][/img]

Thats the seals and what not, There are four of those holes positioned around the pipe, I decided it would be easier to have the slide move along the o rings rather than fixing the o rings to the slide and having them move along the pipe.
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Unread postAuthor: Gippeto » Sun Aug 17, 2008 10:33 am

Very simple. :)

The blow gun I use on my copper gun has a horrendous trigger pull at 400psi.

I think something like this is going to be a big improvement.

Ragnarok uses/used a slide valve as a trigger on HEAL.

Maybe he will chime in and tell us what the trigger pull is like?
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Unread postAuthor: PVC Arsenal 17 » Sun Aug 17, 2008 10:54 am

That looks great! Didn't seem to take you long to make. It's a wonder we don't see slide checks used more often.
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Unread postAuthor: trollhameran » Sun Aug 17, 2008 10:59 am

I would definitely recommend it instead of a blowgun, it is so easy to make and it can be build straight onto the end of your pipe, so you dont need to buy any fixings to get the pipe down to the right size to fix on to the blowgun.

Heres a video and a picture of a gun I just put it onto to test it, its not very powerful....at the moment but i plan to reduce the pilot size massively and increase the chamber size and barrel length.

Also I know the barrel isn't straight, I was playing around with the falling block design again and its just something I threw together out of scrap.

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Unread postAuthor: psycix » Sun Aug 17, 2008 5:17 pm

Nicely made!
The only problem I want to fix is, at the moment the slide doesn't move back into position as easily as I would like.

When sliding it back on, its disangled and needs to be pulled straight before it can get back on the o-ring right?
You could add one more o-ring behind the hole so it remains resting on 2 o-rings or more at all times and doesnt get disangled.
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Unread postAuthor: POLAND_SPUD » Sun Aug 17, 2008 9:41 pm

AFAIK these things are hard to open as the pressure increases.. I don't remember who told me so maybe it was ragnarok... well who cares they are the cheapest 3 way valves available

@trollhamermann - nice job it looks quite good I have one question is exactly like an off the shelf slide-check valve? In a way that it blocks one side when the other is vented or does it only vent the whole system?
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Unread postAuthor: grumpy » Sun Aug 17, 2008 10:08 pm

I use a slide valve on a remote line for my paintball markers and it operates easily with 850 psi. a little oil on the orings and the inside of the sleave will help.
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Unread postAuthor: Gippeto » Sun Aug 17, 2008 11:40 pm

Thank you Grumpy, I'm convinced.

Another lunch time project. :)
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Unread postAuthor: trollhameran » Mon Aug 18, 2008 12:58 am

psycix: yeah I did think about putting another o ring in to help it stay straight, I will try and find one and put it in today.

POLAND_SPUD: It only vents the whole system, which is what I wanted, I think it could be modded to work exactly the same as an off the shelf valve though, It would need four o rings though, I think.

Im going to make a trigger for it, and maybe put another o ring in today, so ill post it up when its done. :D
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Unread postAuthor: Brian the brain » Mon Aug 18, 2008 10:41 am

You will need to block the center pipe in order to have it work as a three way...
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Unread postAuthor: starman » Mon Aug 18, 2008 11:00 am

Sweet little item Troll...just got kicked into the bookmarks.
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