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help with piston configeration

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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help with piston configeration

Unread postAuthor: experament-u2 » Mon Feb 12, 2007 3:21 am

i was wondering if it is possible to make a piston that works like this
Image

and another question if u heat pvc and bend it slightly would it still be able to hold pressure? around about how much psi
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Last edited by experament-u2 on Mon Feb 12, 2007 5:20 am, edited 1 time in total.
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Unread postAuthor: killagorrila99 » Mon Feb 12, 2007 3:51 am

Definatley. Hold on and I'll draw a design.
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Unread postAuthor: jrrdw » Mon Feb 12, 2007 5:43 am

Works like what? Goes in 3 different directions? I'm confussed on what you mean.
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Unread postAuthor: Recruit » Mon Feb 12, 2007 6:19 am

http://s124.photobucket.com/albums/p32/ ... piston.jpg I think this would work but it would need some more work. Jrrdw what he is saying is you have the piston seal in a tee but have the piston is the 45 degree spot instead.

Edit.
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Last edited by Recruit on Mon Feb 19, 2007 7:15 am, edited 1 time in total.
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Unread postAuthor: Velocity » Mon Feb 12, 2007 6:24 pm

Yes... its called a modified sprinkler valve :o .

You can easily make one with PVC fittings. I know noname did one. Problem is, they have poor flow and are not as good compared to regular piston valves.

Clide built the pl3x valve, which works on the same concept (check it out on spudfiles).
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Unread postAuthor: Tobe_666 » Mon Feb 19, 2007 3:59 am

it ain't a modded sprinkler valve. it's just a T with a piston valve built inside it, ya cant buy one like that ya have to build it from scratch. im having trouble understanding the basic concept of the piston but ill work it out (i hope) lol
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Unread postAuthor: jrrdw » Mon Feb 19, 2007 6:44 am

Recruit wrote:http://s124.photobucket.com/albums/p32/AngryRecruit/?action=view&current=piston.jpg I think this would work but it would need some more work. Jrrdw what he is saying is you have the piston seal in a tee but have the piston is the 45% spot instead.


What do you mean 45% spot instead?
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Unread postAuthor: Recruit » Mon Feb 19, 2007 7:14 am

jrrdw wrote:
Recruit wrote:http://s124.photobucket.com/albums/p32/AngryRecruit/?action=view&current=piston.jpg I think this would work but it would need some more work. Jrrdw what he is saying is you have the piston seal in a tee but have the piston is the 45% spot instead.


What do you mean 45% spot instead?


Sorry degree not % :oops: :oops: .
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Unread postAuthor: CS » Mon Feb 19, 2007 11:46 am

Well from a theoretical standpoint I can only think of two designs, to fit the desired configuration. That being both the mentioned 90 degree seat, being perpendicular to the venting port. Second, the idear with the sealing face, and piston face both being at 45 degrees to make up for the 90 degree different in travel path. Below I made a digram of the 45 degree idear.

NOTE- There may be trouble with rotation on the Y axis, as in the event of such, the piston will not seat properly. I can think of two solutions if the current spring set, and gravity don't solve the rotational problem. The obvious, increase spring set pressure. Other being to employ a key way, or some other means to mechanically limit the pistons rotation on the Y axis.
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Attachments
006.PNG
45* Piston/ Sealing Face in 'T' Configuration - Pimpmann22
006.PNG (1.96 KiB) Viewed 1063 times
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Unread postAuthor: squeaks » Mon Feb 19, 2007 12:19 pm

I've made an inline piston exactly like this. All you do is push the pipe in from the barrel and put a 90 degree elbow to use as the seat. You may have to cut a little off of the elbow. Just make sure you get the elbow on nice and square. This kind of piston works very well.
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Unread postAuthor: VH_man » Mon Feb 19, 2007 3:00 pm

Looks like alot of Flow restriction
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Unread postAuthor: squeaks » Mon Feb 19, 2007 6:08 pm

I don't know the link but look in the forum for valve cutaways. There's a diaphrahm valve cutaway that is exactly like the piston you want to do.
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Unread postAuthor: BC Pneumatics » Mon Feb 19, 2007 8:35 pm

Tobe_666 wrote:it ain't a modded sprinkler valve. it's just a T with a piston valve built inside it, ya cant buy one like that ya have to build it from scratch. im having trouble understanding the basic concept of the piston but ill work it out (i hope) lol



What he meant was that the internals would be very similar to a sprinkler valve, which is very true.

(That's assuming of course that he uses the 'standard' design for this type of valve.)
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Unread postAuthor: squeaks » Tue Feb 20, 2007 11:59 pm

This valve is actually really easy to make. Best of luck to you making it. It makes a rather cheap compact valve too. I recomend this style to everyone. It's great.
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