I was looking at the valve in my AT3K, and said "Promy, that's what your looking for," so I decided to build this.
Full credit goes to CaptainSlug for the original design, and for buidling something that finally prompted me to try and revise and improve.
It's the dchap-P
For dirt cheap homemade air powered - Prometheus' version.
2x 5/16" washers
2x 5/16" nuts (special ones)
1x 1/2" SCH 40 coupler
2x 1/2" PVC endcap
1/2" 200 PSI thinwall PVC
1/2" SCH 40 PVC
5/16" ID o-ring
5/8" ID, 13/16" OD, 3/32" thick o-ring
1/4" drill bit (HSS was used)
5/16" drill bit (HSS was used)
some type of grinding tool (dremel was used)
Plumber's Goop (suitable PVC and rubber bonding material can be used as substitute)
Mine is very different, but builds on CaptainSlug's original design. I use 2 o-rings to make a seal. One is 5/16"" ID, and the other is 5/8" ID, 13/16" OD, 3/32" thickness. The reason I used these is that the 5/16"" ID ring seals around the bolt, which actuates the movement of air. The second o-ring seals agains the other end of the bolt, against a special type of nut. I have no idea what typ of nut it is, other than it is a spare from my garden tractor when I removed the mower deck. It's pretty standard on most lawnmowers, to just trading for a regular nut won't hurt.
Here is the first design I made, which is very close to the design I'm using.
The design on the right is the one that I am using, but instead of using the fender washer (purple/pink), I used the nut and o-ring.
Here is another picture of all the parts disassembled. The spring is one I found at my local hardware store, and I cut it in half for this purpose. Measures for the spring will follow.
The valve currently can be separated into 2 pieces, as seen here.
Here is the piece that I ground the end off, and inserted into the hole drilled into the side of the valve.
It is barbed on one end, and I have no idea what it would be used for. I am using 3/8" OD vinyl tubing on it now.
More detail such as measures on the PVC lengths will follow.
Edited by Prometheus, 27 July 2007 - 11:48 AM.