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DIY 3/2 DCV (video)

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Unread postAuthor: MRR » Fri May 28, 2010 10:42 am

Yes I used a return spring but it is pretty improvised for the video.
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Unread postAuthor: Jack_Hogg » Fri May 28, 2010 10:50 am

Now this piece really comes clear :idea:
I still need to know a few things :oops:
1. Rod returning spring
2. The thing where the piston slides in
3. Piston bumper

Thanks in advance :wink:
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Unread postAuthor: MRR » Fri May 28, 2010 11:02 am

1. Return spring -> spare part
2. 1" male to 1/2" female -> 1/2" male to 1/4" female
3. No bumper but I have to say that the "washer" is extremely durable. Actually it's a rope pulley cut in half.
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Unread postAuthor: woodscout » Mon Jun 14, 2010 4:26 pm

that looks very promising, just attach a barrel and feed mechanism and you got a semi-auto cannon :D
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Unread postAuthor: Jack_Hogg » Tue Jun 15, 2010 1:21 am

woodscout wrote:that looks very promising, just attach a barrel and feed mechanism and you got a semi-auto cannon :D


That's my plan :)
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Unread postAuthor: Crna Legija » Tue Jun 29, 2010 3:28 am

iv got all the parts for this just need to know, do you think that a solid lead bar would be alright for the shaft part or would it be better to cut o-ring groves in nuts and thread them on a peace of all thread.

ill be using it at 300psi.
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Unread postAuthor: MRR » Tue Jun 29, 2010 11:05 am

I think lead is far to soft and doesn't take to much force. The idea with the all thread is worth a try but you might have the problem that air passes through the threads.
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Unread postAuthor: Gun Freak » Tue Jun 29, 2010 11:38 am

To fix that, use some epoxy or JB between the nut threads and bolt threads to seal it.
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Unread postAuthor: s.tyler81 » Thu Jul 08, 2010 1:49 pm

This valve design would be perfect for something im working on could you possibly pm me the specs for the aluminum rod? Thanks
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Unread postAuthor: Distemper » Tue Nov 23, 2010 10:26 pm

Hi, I made a stainless steel rod with a spring(20psi) in the end of the rod and works very nice, but i have a problem with the quick exhaust valve part, i dont have any idea how it is inside, i mean; what parts are necessary in order to work as the one of the video?
somebody can send me a internal diagram?
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 23, 2010 11:35 pm

The valve is basically the pilot for a piston valve, explained in great detail here., it woild be hooked up to tje port marked "P" in the diagram below (where "R" would be your barrel and "A" your chamber")

Image

You can make your own or purchase oneready made.

Image
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Unread postAuthor: Distemper » Wed Nov 24, 2010 11:45 pm

Thanks jackssmirkingrevenge your post is very useful, finally I understand how the equalization hole and the piston works, now i'm going to search the materials to make one piston valve.
it's gonna take me a while make one but, when it's done i'm gonna upload the pictures.

again, thanks for your help.
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Unread postAuthor: bladeul2006 » Wed Feb 13, 2013 12:56 pm

Image


here is my project , I have a little more work but I hope to make some photos when it”s ready
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 14, 2013 1:48 am

You could save yourself a lot of work and heartache by simply purchasing a Qucik Exhaust Valve and 3-way valve from eBay, but kudos if you decide to "roll your own" and succeed.
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Unread postAuthor: MRR » Thu Feb 14, 2013 7:28 am

Yea, I'm with JSR on this one. The 3-way was more a proof of concept / challenge and it was a pain to make the rod (did it on a drill press). A commercially available 3-way valve would be cheaper and in a much smaller form factor.
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