Machined inline diaphragm->piston valve mod.

[psycix]

BTB handed me a brass sprinkler-type diaphragm valve, of which he blew the diaphragm. He asked if I could "machine something" for it.
Well of course I could!

Original valve + machined block.


Block on top of it (not yet bolted down). Black stuff are two types of rubber sheet which are used as sealing face and gasket.


Disassembled parts.


Piston in its place.


The only thing that was not machined on a mill/lathe is the cone on the piston. This picture proves that I can also build awesome stuff without the use of a lathe or mill.
Just a drill clamped in the vice, and some sharp or rough tools.


A few specs:
-1/2" valve
-1/4" threads to be tapped in the top.
-20mm piston made from Delrin rod.
-Piston diameter is only 0.01 to 0.02 mm smaller then housing's, near airtight without friction.

This valve will probably serve as pilot valve on BTB's "Mr Porter".

[jrrdw]

Nice work. Question, Why not do the taper with the lathe? Doesn't the head of your lathe swivel?

[POLAND_SPUD]

wow that's amazing...
I lolled at afghan lathe but these things really work

it seems that soon you can start supplying us with HP spool valves

[psycix]

Nice work. Question, Why not do the taper with the lathe?

I could've done it on the real lathe, but that would give a straight cone, and I wanted it to be curved.

it seems that soon you can start supplying us with HP spool valves

Draw something up and transfer the material and shipping cost onto my bank account.
No joke, I'd love to produce valves for people.

[POLAND_SPUD]

do you plan to build a HPA gun with a custom QEV or something like that?

Draw something up and transfer the material and shipping cost onto my bank account

not yet but I might need something in the near future

[psycix]

No (not yet). I am currently planning to build a pump action hammervalve gun, and then a pen gun.

[Brian the brain]

[psycix]

Do you guys think it needs a bumper?


Brian, I'm giving you those two sheets of rubber (both 10x10 cm), just experiment which type you will be using as gasket and possibly bumper.
I'll also give you a short leftover piece of delrin rod, the same diameter as the piston.

[Brian the brain]

Thanks!
I got the tools to make the gasket.I don't think it needs a bumper.

[Hotwired]

Cunning.

I considered a side piloting valve a while ago and seeing this, the irony is, I did draw up almost exactly a sprinkler valve but gave up because it would be too awkward to make.

Never occurred at the time that I was reinventing the wheel

[Willdebeers]

Now how the @^$% am I supposed to top that!? (Private BTB joke)

[Brian the brain]

There will be a lot more coming if it's up to me

[MrCrowley]

Me thinks you should round of the edges on the machined block

[psycix]

Me thinks you should round of the edges on the machined block

Good idea, I might do that on later projects.
I think a bit of mirror-shiny polishing would also look nice...

Now how the @^$% am I supposed to top that!?

Hold those words for my next piece of machining, this one is not perfect. This was just a warming-up.