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DFTV Implementation

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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DFTV Implementation

Unread postAuthor: mark.f » Fri Mar 04, 2011 5:31 pm

If you don't know what DFTV stands for, check here.

It's been since 2006 since the above page was modified, and still longer since the valve was made, and I was always surprised that I hadn't seen another one like it built since (of course I never tried myself, so that's slightly hypocritical)...

Operationally, it's just a barrel sealer (only in a different configuration ((no elbows to bring the tee inline with the barrel)) ), with an attachment on the back which seals off the pilot volume, and moves backwards with the piston, uncovering a large hole to vent the pilot volume quicker.

I doodled up this little ditty (WARNING: large animation) to show how one would function with standard parts and in the configuration of a normal barrel sealer. Does this simplify the concept any?

<div align="center">Image
Click for larger image...</div>

Simple barrel sealer, floating o-ring for equalization, 2" tee, 1.7" port... only difference is that the threaded rod going through the piston attaches to an external sealing face which seals the rear port when the piston is closed. The surface area differential keeps the piston and sealing face sealed. Also, the pilot and fill valves would have to be threaded into the side of the tee like the original DFTV.
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Unread postAuthor: Gun Freak » Fri Mar 04, 2011 6:49 pm

Looks like a piston hybrid valve. It has been discussed for pneumatic use somewhere but I can't find it :lol: The animation definitely simplifies it. The diagram on the linked web page is a bit overly complex... quite like mine :D It seems like a very good way to make a piston valve... although I bet it was difficult to tune in the sealing faces to the right spots...
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Unread postAuthor: Secret Squirrel » Fri Mar 04, 2011 7:39 pm

I had this idea a few months ago after being inspired by hybrid piston valves. While I can't call it my idea anymore, it's nice to know the concept works.
My thread on the subject:
http://www.spudfiles.com/forums/assisted-pilot-t22042.html
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Unread postAuthor: Gun Freak » Fri Mar 04, 2011 7:46 pm

Yep... that's the thread I was looking for. Thanks 8)
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Unread postAuthor: jrrdw » Fri Mar 04, 2011 8:28 pm

DFTV ='s Darn Fast Turbo Valve. Says so at the top of the page you linked to.

I'm not a big fan of this set up, it's over kill for a simple operation.

What's that saying? oh yea, keep it simple.....stupid! :twisted:
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Unread postAuthor: mark.f » Fri Mar 04, 2011 9:27 pm

What's so complicated about it again? I could build this from standard materials with nothing more than hand tools and some patience.
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Unread postAuthor: jrrdw » Fri Mar 04, 2011 9:32 pm

To many parts for what it's doing. Never said it was to complicated.
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Unread postAuthor: Gun Freak » Fri Mar 04, 2011 9:52 pm

It's a good solution if you have a tiny pilot valve but otherwise it isn't really needed. It is cool though.
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