SpudFiles

I have always wanted to make a nice piston valve, but the only one I knew how to make required a lathe. I don't have a lathe.

I want to make a three inch version of Brian the Brain's no o- ring piston valve. http://www.spudfiles.com/forums/viewtop ... 385b5e4161

I know I can get the sheet from mcmaster, but I do not know which one will work.

heres what mine looks like:

-uses rubber washers instead of o-rings.

That is a pretty sweet design

Anyone have an answer to my question?

Using Chaos's design, you would not need to purchase a neoprene sheet. If you have a different design in mind however, I would suggest something like:

• 1/8" thick
  60A-70A Durometer Rating
  Smooth on at least one surface
  No need for any under strict tolerances (they will just cost more)

will this work?
8568K714

Yes, it will. Although here is something that is about half again as cheap:

9455K874