piston valve specs

[Major Collins]

what are pros and cons of having , o ringed grooves and a check valve added to you piston of a piston valve?

[Crna Legija]

what are pros and cons of having , o ringed grooves and a check valve added to you piston of a piston valve?

pros: more powerful and efficient valve that can be piloted by a lot smaller pilot valve

cons: harder to make, might fire if theres a leak in the pilot side of you cannon