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.25 cal regulator

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Treb37:
I wanted to up the pressure output and increase the bottle size on my .25 gauntlet so I ordered shims and pressure tester from Hajimoto. I removed the reg from the stock bottle and put it on a 22ci bottle from Ebay. The shim kit came with enough shims to also up the output of my HPA converted Ninja QB78 to 1400psi and that worked perfectly. When I tried shimming the Gauntlet reg I get all kinds of weird pressures none above 1950 and most often under 1K. Has anyone else had this non-Ninja regulator apart? I'm pretty sure I didn't lose any parts or install anything wrong but since it just won't work since I've had it apart I'm beginning to wonder.

Treb37:
So today I tried installing the belleville washer stack from the Gauntlet reg into the Ninja SHP reg. That produced something in excess of 2400psi in that regulator housing. I didn't want to pump it up any higher for fear of blowing the 3K rupture disc. I tried it a couple times with and without shims and got the same result. Here is what the inside of the Gauntlet reg looks like. I used the washer stack exactly how it's arranged on the piston in the pic.

Hajimoto:

--- Quote from: Treb37 on January 11, 2021, 01:52:56 PM ---I wanted to up the pressure output and increase the bottle size on my .25 gauntlet so I ordered shims and pressure tester from Hajimoto. I removed the reg from the stock bottle and put it on a 22ci bottle from Ebay. The shim kit came with enough shims to also up the output of my HPA converted Ninja QB78 to 1400psi and that worked perfectly. When I tried shimming the Gauntlet reg I get all kinds of weird pressures none above 1950 and most often under 1K. Has anyone else had this non-Ninja regulator apart? I'm pretty sure I didn't lose any parts or install anything wrong but since it just won't work since I've had it apart I'm beginning to wonder.

--- End quote ---


If you have the cheaper Chinese/Taiwan made regulator on your Gauntlet you need to take some extra steps to have adjustment work successfully. The Belleville washer stack configuration will always need to stay the same obviously but the issue is that the washers have very sharp edges and that produces stiction.
I always remove all the washer and using a piece of 3000GRIT sandpaper and silicone oil, I polish the washer by laying the sandpaper on a hard flat surface, then place the washer down on the paper hump side up and with light finger pressure do about 10 circles to polish any sharp edges off.


After polish them, all, use a clean lint-free cloth and wipe off all dust, dirt, or filings and apply a thin coat of silicone oil on your fingers to apply to the washers.
Rebuild the stack as it was initially and shim accordingly.


When filling the reg, fill to 500 then degas then fill to 1000 and degas, then final fill as the washers should have settled at this stage and you will have a more accurate or stable result.

Treb37:
Thanks Haji, would you have any ideas on why the same Belleville washer stack in the Ninja regulator produced at least 2400psi? I just tried what you suggested polishing them on a piece of glass then clean and lightly lube. Filled to 500 and degassed, all worked well. Filled to 1000 and it was working so I went to 1500 and the reg only got to 1200. Degassed and tried again filled to 2K and got 900 psi. There doesn't seem to be any rhyme or reason for how this thing works. I have a Ninja 4500 regulator coming and I hope I can adjust the shim stack in that one and make it work.

Hajimoto:

--- Quote from: Treb37 on January 12, 2021, 08:11:36 PM ---Thanks Haji, would you have any ideas on why the same Belleville washer stack in the Ninja regulator produced at least 2400psi? I just tried what you suggested polishing them on a piece of glass then clean and lightly lube. Filled to 500 and degassed, all worked well. Filled to 1000 and it was working so I went to 1500 and the reg only got to 1200. Degassed and tried again filled to 2K and got 900 psi. There doesn't seem to be any rhyme or reason for how this thing works. I have a Ninja 4500 regulator coming and I hope I can adjust the shim stack in that one and make it work.

--- End quote ---


 You are welcome. I do have a good idea of why the Chinese stack is hitting 2400 PSI in a Ninja body. I am willing to bet that the piston's upper cap rise thickness is greater on the Chinese piston. The Belleville stack arrangement you show on the Chinese piston ))(())(())(( will produce 1500 PSI on a Ninja piston in a Ninja body using Ninja Belleville washer so I would remove the first Belleville washer )(())(())(( and try the stack again in the Ninja body.


As for the 500 and 1200 fills hitting the mark but the 2k not, there is still some stiction happening. By any chance when the Belleville washers were removed did you inspect the surface of the piston to be sure they were not biting into the aluminum wall?


So you know, I have had over 50 Chinese regulators off of Gauntlets present what you are describing and it has been my experience that complete disassembly, polishing, and silicone oil coating, resolved the issues for me.

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