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A Do-It-Yourself tour of the Airguns of Arizona Disco Regulator

July 10 2011 at 9:39 PM
  (Login pneuguy)

The AoA Disco regulator...

http://www.airgunsofarizona.com/DiscoReg.htm

...has been available for just a little over a year, and it's been suggested that there might be interest in a short post to document disassembly and recalibration of this simple little part as an owner might do it - from start to finish - with no special tools. So here it is.

Disassembly begins by simply sliding out the dowel pin key with the tip of a sharp screwdriver. This step is easiest if the force on the piston from preload of the regulator spring is removed by dialing the adjustment nut to a low pressure setting (see diagram near end of post).

 
 
[linked image]
[linked image]
[linked image]
Having the seals, springs, and parts laid out for inspection provides an opportunity for replacing any that look worn.  In this case they were clean and in perfect condition, I just assembled them in the correct order on the Piston/Stem, and slid them back in place, followed by reinserting the dowel pin.

[linked image]

The next step is to restore the PSI calibration setting.

This is easy to do with the AoA regulator, because a default baseline calibration of 1000psi (69bar) is built into the design. All that's necessary to set it, is to reach in through the adjustment slot and rotate the adjustment nut "star wheel" toward higher PSI until the slack just disappears from the disk spring stack and turning resistance is felt. In one step this compensates for production variations in the height of the disk springs and regulator housing, resulting in a preset pressure accuracy of about +/-5% = +/-50psi.

[linked image]

Final testing was done in the most graphic and conclusive way I could think of. I installed it in a handy .22 12fpe Disco (AoA HDD, Power Adjuster, and lightened hammer), filled to 2000psi, and did a shot string until the gun came definitively off the regulator.

[linked image]

Actual shot string

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607 PelletWeight (CPHP) = 14.3gr
607 MVavg = 601.9fps
612 STD = +/-3.2fps
611 MVes = 18fps
611 MEavg = 11.5fpe
610 bar-cc/fpe = 7.6
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Steve


    
This message has been edited by pneuguy on Jul 10, 2011 9:46 PM
This message has been edited by pneuguy on Jul 10, 2011 9:45 PM


 
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