An Idea...

[Intel Xeon]

It is said that curiosity killed the cat, but I'm still going strong.

Anyways, assuming that you had a near leak-proof piston, instead of an equalization hole, you could use a one way valve so that if you filled from the pilot area, you would have an extremely efficient piston valve.

[keep_it_real]

Many people have talked about this. Some put the rubber over the equalization hole so it acts like a check valve. I thought (and probably others) about putting a presta valve inside which is a check valve.

[CS]

I believe that Gort installs a check valve in his barrel sealers, or at least in one of his valves. As I recall him mentioning it in one of our chats over AIM.

[Intel Xeon]

Ok, thanks for the info!

[jackssmirkingrevenge]

I've incorporated this into some of my mini coaxial designs, like this.

[rna_duelers]

Hahah nice pimp..That was a little secret of gorts,or so I was told.

A simple one way valve could be built into a piston easily,like Keep_it_real said.A piece of thin rubber material that only allows air to flow one way.

As for a super efficient piston.Weight is also very important and the weight of a check valve could decrease it's efficiency.That's only if you were over the top about efficiency and weight dwell time etc etc

[MrCrowley]

Hahah nice pimp..That was a little secret of gorts,or so I was told.

Not really, I don't think so anyway, I knew anyway.