SpudFiles

Cant you turn the slide valve around the other way?

oneocim wrote:I don't know if there is other type of slide valve but with the common available one with that design you will be pushing the trigger than pull it. You should move the valve near the qev to have forward direction, except you want to add more mechanical to the trigger.

Nope.

edit: Yep.

johnnyssparklyradish wrote:Nope.

Nope to your nope. The design as Andrew_J has it has the sleeve valve mounted back to front (either that or every time it's pulled, it'll vent the entire air supply tank rather than fire. (And in answer to Andrew_J's question, no, they can only be correctly mounted one way around).

However, moving it up and around the U-joint would let it be mounted the right way around so that pulling it (rather than pushing it) would vent the pilot.
Also, that'd reduce the pilot volume.

Sorry jack, the one that I mean will have to push the trigger is andrew's design not the one you have.

Sorry jack, the one that I mean will have to push the trigger is andrew's design not the one you have.

Wankakok wrote:Nope to your nope. The design as Andrew_J has it has the sleeve valve mounted back to front (either that or every time it's pulled, it'll vent the entire air supply tank rather than fire. (And in answer to Andrew_J's question, no, they can only be correctly mounted one way around).

Quite right, mea cupla

Don't listen to the newbies...

You can orientate the slidevalve the other way...if you approach it differently.

Modify your QEV ( tiny equalisation hole and spring) and it will stay closed while pressure comes in from the chamber ( reservoir) side rather than the factory version wich will only accept pilot-side filling.

Put the slidevalve on the pilotside, in reverse, but cap off the other end.

When you slide the valve now, pressure drops in the pilot area and fills the slidevalve and capped off end.
It will pilot the QEV ...and the QEV will reseal as pressure equalises.

Then, slide the slide of the slidevalve ( ) back and the stored pressure is released.

The volume in the slidevalve and cap is now ready to be repressurised from the pilot area again.

This method also means you're not dumping all the pressure from the reservoir even after the projectile has left the barrel.

Ideally, the "capped"volume would be adjustable to where shotpower is maximised while waste is minimalised.

Hey,
I was just wondering if you could send me a basic diagram of the mechanism you were talking about

Thanks,
Andrew_J

Could you use something like this for an air pressure regulator?

No. To regulate pressure, the spring needs to be opposed by downstream rather than upstream pressure.

This is an animation I did some years ago to demonstrate the basic principle:

So you tighten the spring for higher pressure?

Andrew_J wrote:So you tighten the spring for higher pressure?

That's how most regulators function.