Such an awesome cannon and then there are evil parts on it
Whats the use of dual 4" piston valves if you can only take it up to 50PSI?
McTT, I understand that you think you will not be able to fill the chamber, and with a perfect seal, that is right, but for optimal results, a prefect seal is required around the piston.frankrede wrote:No no no, I understand completely, I'm just saying that you need an almost airtight fit around the piston.McThunderThighs wrote:@frank: I don't think you are understanding. I am using a coaxial(x) valve, the air to push the piston forward and to fill the reservoir comes from behind the piston, seals the piston with a gasket against the barrel (or the stuff to the barrel) and then goes around the piston to fill the rest of the reservoir. If the piston sealed to the sides of the valve, then the reservoir would never fill and then what's the point?
Air will leak past.
Your cannon isn't a coaxial, its a barrel sealing piston valve in a T.
Solution to the filling problem:
A small (VERY SMALL) equalisation hole in the piston.
This hole is usually drilled under the flap of the sealing face so it basically has a one-way valve. Air can get into the chamber, but no air can leak back outta pilot.
Frank is right about the airtight fit.