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how do i make a piston valve

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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how do i make a piston valve

Unread postAuthor: qwert123 » Mon Nov 08, 2010 6:13 pm

what is a good way to make a .75" to a 1" piston valve. it needs to be noob friendly a i don't want to have to modify plumbing parts :)
im too lazy to search
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Unread postAuthor: saefroch » Mon Nov 08, 2010 6:33 pm

Be sure you understand this first. Most piston valves are built in a tee, with a bushing or nipple as surface the piston seals to. The piston then slides back into the tee or an attached pipe.

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Re: piston valve

Unread postAuthor: MrCrowley » Mon Nov 08, 2010 7:42 pm

qwert123 wrote:what is a good way to make a .75" to a 1" piston valve. it needs to be noob friendly a i don't want to have to modify plumbing parts :)

You mean a 1" piston with .75" porting?

Well you generally need a seat (what the piston seals against), a piston (the moving part of the valve), a chamber (to store the air pressure) and a pilot valve (to actuate the piston). You should've figure that out by yourself. As for making the piston, since you gave us no clue to as what materials you are using we cannot give you any ideas for what to make the piston from. We need specifics, for example 1" Sch40 NSF-PW PVC.

Pistons can be made from anything. Go to your garage, kitchen or the hardware store and just walk around with a bit of pipe to see what fits in it. If you find something that fits really well and is a suitable material for a piston, use it. It is difficult to use the exact same piston as another member has used since the diameters vary quite significantly depending on the exact pipe used etc.
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Unread postAuthor: clemsonguy1125 » Mon Nov 08, 2010 8:37 pm

saefroch wrote:Be sure you understand Most piston valves are built in a tee

that not always true, many people build coaxial valves where the barrelextends into the chamber. I suggest you cast a epoxy piton around a rubber stopper. JSR has a great tutorial. The best thing I can recommend is that you read through the showcase and use spudwiki. MRR has a tutorial on youtube for a 3/4 valve I believe.
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Unread postAuthor: Gun Freak » Mon Nov 08, 2010 9:33 pm

Uhh...
it needs to be noob friendly a i don't want to have to modify plumbing parts

I can almost gaurantee you will need to modify something to make a piston valve. To keep it simple and cheap, I recommend reading up on coaxial piston valves. 1.25 chamber and 1/2" barrel is a good choice. This gives you the option of little modification and using 3/4" parts for the chamber. Look through the showcase and the wiki and whatnot, and I cannot stress this enough, but you can never do too much research before you dive into the wonderful world of pison valves :)
Don't just jump right into it, take your time, and don't make it ghetto. Use the right parts, good craftsmanship and good quality and you will be happy with the end result.
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Unread postAuthor: saefroch » Mon Nov 08, 2010 10:01 pm

Somebody other than saefroch wrote:Be sure you understand Most piston valves are built in a tee
See my actual post.

Usually tee piston valves are easier to construct, as they only require putting a few fittings together with a piston inside.

Gun Freak wrote:Don't just jump right into it, take your time, and don't make it ghetto. Use the right parts, good craftsmanship and good quality and you will be happy with the end result.

Agreed, do it right the first time. Don't try to just put a few things together and get something to work. My first piston valve was incredibly ghetto and cost me a lot of money in home repairs when it blew apart.
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Re: piston valve

Unread postAuthor: jackssmirkingrevenge » Tue Nov 09, 2010 12:37 am

MrCrowley wrote:just walk around with a bit of pipe to see what fits in it.


That is almost the very definition of being male :D

qwer123 wrote:im too lazy to search


Given that deplorable statement I'm surprised so many members offered their advice. Just buy a 3/4" QEV, it'll most likely be miles ahead anything you manage to bodge together and will avoid a lot of heartache in the long run.
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Re: piston valve

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Unread postAuthor: Technician1002 » Tue Nov 09, 2010 1:51 am

If you are too lazy to search, you probably will have problems with a home made piston valve.
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Re: piston valve

Unread postAuthor: Gun Freak » Tue Nov 09, 2010 9:17 am

jackssmirkingrevenge wrote:Given that deplorable statement I'm surprised so many members offered their advice. Just buy a 3/4" QEV, it'll most likely be miles ahead anything you manage to bodge together and will avoid a lot of heartache in the long run.


That pretty much somes it up. If you're not willing to put any work into this, it will be a nightmare. Save yourself the searching and buy a QEV :roll:
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