HELP!!!!

[M3NT4L]

I suck completely at tryng to make a piston valve con someboday help me by posting a diagram instructions or something ive looked all over and i cant fing anything very helpfull. I am making a galvanized steel "T" style cannon and i need help making a piston valve inside the t ventilated by a blogun/ballvalve. Thanks

[Velocity]

<a href="http://www.spudfiles.com/uploader/uploa ... .JPG">1</a>
<a href="http://www.spudfiles.com/uploader/uploa ... .JPG">2</a>
<a href="http://www.spudfiles.com/uploader/uploa ... .JPG">3</a>
<a href="http://www.spudfiles.com/uploader/uploa ... .JPG">4</a>

I don't have any diagrams, but these are some pictures of a finished one.

[M3NT4L]

Thanks, but i need to know what to use for a good seal (material) and if it HAS to be filled from behind the piston.

[MrCrowley]

yes has to behind the piston to make it move foward look here:http://forums.spudtech.com/topic.asp?TO ... hichpage=1
use neoprene has a really good seal

[Velocity]

Thanks, but i need to know what to use for a good seal (material) and if it HAS to be filled from behind the piston.

no it does not. If you use a spring, you can fill from the chamber. However, for simplicity's sake, as well as sealing issues, I would reccommend that you fill from behind it.

For a sealing face, I use 1/8" neoprene off of mcmaster.

[MrCrowley]

oh yeah true forgot about that but it does have to exhaust from behind doesnt it?