SpudFiles

Thank you in advance.

Yeah...your barrel is the same size as the piston. Or in technical terms, your 'seat' is the same diameter as the piston's sealing face. Meaning there is no piston/seat area differential. Without this sealing face area exposed to pressure, the piston will have difficulties working.

I suggest you read more on WHY pistons work. What makes a piston valve work? Ask yourself that question, and you will see that you have no unbalanced force, forcing the piston back when the pilot volume has been exhausted.

Edit:


That's a diagram 'thedeathofall' made for another topic, it shows the flaw in your design that I talked of.

so how would i make an equalization hole?sorry if im asking to many questions.

What's an equalization hole go to do with what I said?

Go to the SpudWiki, in the search tool type in 'piston valve'. Start there.

You only need an equalization hole if your piston seals PERFECTLY along the sides. That means that you have applied orings in the proper way.
But then I would go with a floating o-ring which acts like a check valve.